EP2251594A1

EP2251594A1 - Illuminating lamp

Info

Publication number: EP2251594A1
Application number: EP09718275A
Authority: EP
Inventors: Tadahiro Okura
Original assignee: Power Eco Japan Co Ltd
Current assignee: Power Eco Japan Co Ltd
Priority date: 2008-03-06
Filing date: 2009-02-20
Publication date: 2010-11-17
Also published as: CN101960217A; WO2009110181A1; KR20100119563A; EP2251594A4; JP2009238734A; TW200944710A

Abstract

Thermal energy generated by a plurality of light emitting diodes is efficiently diffused to the outside. An illuminating lamp is provided with an attaching substrate (4) whereupon a protection cover (3), which has a plurality of planarly fixed projectors (2) each having a light emitting diode as a light source and transmits light, is fixed on one plate face (4a) so as to cover the projectors; a plurality of board-like cooling fins (5) which protrude from the other plate face (4b) of the attaching substrate and are fixed so as to dissipate heat generated by the projector; and a housing (6) which has a storing concave part (6a) and has the attaching substrate fixed thereon. The attaching substrate is formed such that a space (S) for taking the external air is formed between the attaching substrate and the inner circumferential wall (6d) of the housing. The board-like cooling fins protrude above the space so as to be cooled by the external air taken from the space. The housing is provided with a plurality of slits (63) which discharge the external air, which is taken from the space and warmed by heat discharged from the board-like cooling fins, to the external.

Description

TECHNICAL FIELD

This invention relates to an illuminating lamp. In particular, this invention relates to an illuminating lamp that a light-emitting diode (hereinafter called "LED") is a light source.

BACKGROUND ART

In order to observe Act on the Rational Use of Energy (hereinafter called "Energy Conservation Law") which was enacted for accelerating an approach toward a propulsion of prevention of global warming, recently, various approaches are conducted in also illumination, and for example, the illuminating lamp that the LED is the light source has been developed (for example, refer to Patent document No.1). This illuminating lamp that the LED is the light source has a long life because power consumption is extremely few, besides, brightness canbe controller easily by electric current, response speed is fast, and emission can be stabilized. Therefore, the illuminating lamp that the LED is the light source draws attention as the new illumination which replaces such as incandescent lamp.
This illuminating lamp that the LED is the light source is provided with the light source which is composed by plural LEDs, a LED attaching substrate that the plural LEDs are attached and a case which houses the LED attaching substrate that the plural LEDs are attached. And, in the case, an opening part is formed at a side where the plural LEDs are located. This opening part is covered by a transparent protective cover, and has a structure that external air does not enter into an inside of the case.
In addition, in this illuminating lamp that the LED is the light source, because thermal energy is generated when the LED emits light, the thermolytic action is given to the case (for example, refer to Patent document No.2 and Patent document No.3). In the illuminating device of the Patent document No.2, the LED attaching substrate is fixed at a bottom of the case through a thermolytic fixed plate, and plural thermolytic fins which are embedded in the bottom of the case are formed in the thermolytic fixed plate. Besides, in the thermolytic structure of the street light which uses the high power LED of the Patent document No.3, the case is composed by the upper lid and the lower lid, and the LED attaching substrate and the protective cover are attached in the lower lid, and the thermolytic folds are formed in the outer circumference of the upper lid.

Patent document No.1: Japanese Patent Publication No. 2001-256805
Patent document No.2: Japanese Patent Publication No. 2002-299700
Patent document No.3: Japanese registered utility model No. 3127938

DISCLOSURE OF THE INVENTION

PROBLEM TO BE 90LVED BY THE INVENTION

However, in the LED illuminating device or the thermolytic structure of the street light which uses the high power LED which is described in the background art, although the heat from each LED can be dissipated by the thermolytic fins or the thermolytic folds, because the case is the sealed structure, the heat could not be dissipated to the external efficiently by the convection of the heat from each LED in the inside of the case.
This invention was conduced to resolve these conventional difficult points, and this invention alms to provide the illuminating lamp that the thermal energy which is generated by the emission of plural LEDs can be dissipated efficiently.

MEANS FOR SOLVINB THE PROBLEMS

An illuminating lamp of this invention for achieving the aforementioned object is provided with an attaching substrate fixed to one plate face so that plural projectors that a LED is light source are fixed planarly and a protective cover that light is permeable covers the plural projectors, plural board-like cooling fins fixed in the state which protrudes from the other plate face of the attaching substrate to dissipate heat which is generated in the plural projectors, and a housing which has a storing concave part, and that the attaching substrate is fixed so that the plural board-like cooling fins are positioned in the inside of the aforementioned storing concave part and so that the protective cover is positioned in an aperture plane side of the aforementioned storing concave part respectively. The attaching substrate is formed so that a space for taking the external air occurs between inner peripheral walls of the housing, the plural board-like cooling fins protrude on the space for taking the external air and are formed so as to be cooled by the external air which enters from the aforementioned space for taking the external air, and the housing is provided with plural slits for discharging the external air which is warmed by a thermolytic action of the plural board-like cooling fins and enters from the space for taking the external air to an external.
According to the illuminating lamp which is a first feature like this, when the plural projectors emit light and the heat transmits to the plural board-like cooling fins through the attaching substrate, the ascending current of the heat occurs by the heat which is radiated from the plural board-like cooling fins and the external air is inhaled from the space for taking the external air. Further, because the inhaled external air passes the narrow space between the plural board-like cooling fins, the flow velocity of the ascending current of the heat accelerates by the venturi effect, and a large quantity of air than the normal atmosphere condition passes between the plural board-like cooling fins. Therefore, the cooling efficiency can be enhanced remarkably.
As for a second feature of this invention, in the illuminating lamp which is the first feature, an area of occupancy in the inside of the space for taking the external air of the plural board-like cooling fins is a size that an animal such as a bird cannot enter into the inside of the storing concave part of the housing from the aperture plane. Because the conventional illuminating lamp has the sealed structure, the animal such as the bird does not enter. However, in the illuminating lamp of this invention, the space for taking the external air is formed between the attaching substrate and the open end of the housing, therefore, in the second feature of this invention, it is utilized that the plural board-likre cooling fins protrude to the space for taking the external air, concerning the area of occupancy in the space for taking the external air of the plural board-like cooling fins, the animal such as the bird cannot enter into the inside of the storing concave part of the housing from the aperture plane.
As for a third feature of this invention, in the illuminating lamp which is the first feature or the second feature, the attaching substrate and the board-like cooling fin are same thermally-comductive materials. According to the illuminating lamp which is the third feature like this, because the thermal conductivity becomes same, the heat-transfer efficiency becomes well.
As for a fourth feature of this invention, in the illuminating lamp which is any one of the first feature to the third feature, at least aforementioned housing among the housing, the attaching substrate and the board-like cooling fin is formed by magnesium alloy. According to the illuminating lamp which is the fourth feature like this, because they are formed by high thermally-conductive and light metal, the cooling efficiency can be enhanced remarkably and the illuminating lamp becomes easy to install.
As for a fifth feature of this invention, in the illuminating lamp which is any one of the first feature to the fourth feature, a position that the slit is provided in the housing is decided to a rising direction of the external air which is warmed by the thermolytic action of the plural board-like cooling fins depending on an irradiation direction of the LED. According to the illuminating lamp which is the fourth (fifth ?) feature like this, because the heat which is dissipated from plural board-like cooling fins can be discharged to the external efficiently, the cooling efficiency can be enhanced.

EFFECT OF THE INVENTION

According to the illuminating lamp of this invention, the external air can be taken into the inside of the space of the lamp fitting efficiently, and the external air can be introduced to the board-like cooling fins directly, and let out to the slit further. Therefore, the thermal energy which is generated by the emission of plural LEDs can be dispersed to the external efficiently.

BRIEF DESCRIPTION OF THE FIGURES

[Fig. 1] The whole perspective view which shows one best mode of embodiment by the illuminating lamp of this invention.
[Fig.2] The front view which shows the illuminating lamp of Fig.1.
[Fig.3] The plane view which shows the illuminating lamp of Fig.1.
[Fig.4] The left side view which shows the illuminating lamp of Fig.1.
[Fig.5] The right side view which shows the illuminating lamp of Fig.1.
[Fig.6] The bottom view which shows the illuminating lamp of Fig.1.
[Fig.7] The back view which shows the illuminating lamp of Fig.1.
[Fig.8] The sectional view which shows the section XX in the illuminating lamp of Fig.2.
[Fig.9] The sectional view which shows the section YY in the illuminating lamp of Fig.2.
[Fig.10] The sectional view which shows the section ZZ in the illuminating lamp of Fig.7.
[Fig.11] The front view which shows the state which attached the projector, the protective cover and the plural board-like cooling fins which are a part of the component of the illuminating lamp of this invention to the attaching substrate.
[Fig.12] The view which shows the plane of the attaching substrate of Fin.11.
[Fig. 13] The view which shows the left side of the attaching substrate of Fig.11.
[Fig.14] The view which shows the right side of the attaching substrate of Fig.11.
[Fig.15] The view which shows the bottom of the attaching substrate of Fig.11.
[Fig.16] The view which shows the back of the attaching substrate of Fig.11.
[Fig.17] The sectional view which shows the section XX in the attaching substrate of Fig.11.
[Fig.18] The sectional view which shows the section YY in the attaching substrate of Fig.11.
[Fig.19] The front view which shows the other mode of embodiment by the illuminating lamp of this invention.
[Fig.20] The view which shows the plane of the illuminating lamp of Fig.19.
[Fig.21] The view which shows the left side of the illuminating lamp of Fig.19.
[Fig.22] The view which shows the right side of the illuminating lamp of Fig.19.
[Fig.23] The view which shows the bottom of the illuminating lamp of Fig.19.
[Fig.24] The view which shows the back of the illuminating lamp of Fig.19.
[Fig.25] The sectional view which shows the section XX in the illuminating lamp of Fig.19.
[Fig.26] The sectional view which shows the section YY in the illuminating lamp of Fig.19.
[Fig.27 The front view which shows the state which attached the projector, the protective cover and the plural board-like cooling fins which are a part of the component of the illuminating lamp of this invention.
[Fig.28] The view which shows the plane of the attaching substrate of Fig.27.
[Fig.29] The view which shows the left side of the attaching substrate of Fig.27.
[Fig.30] The view which shows the right side of the attaching substrate of Fig.27.
[Fig.31] The view which shows the bottom of the attaching substrate of Fig.27.
[Fig.32] The view which shows the back of the attaching substrate of Fig.27.
[Fig.33] The sectional view which shows the section XX in the attaching substrate of Fig.27.
[Fig.34] The sectional view which shows the section YY in the attaching substrate of Fig.27.

EXPLANATION OF THE NUMERALS

1, 100: illuminating lamp
2, 200: projector
3, 300: protective cower
4, 400: attaching substrate
4a, 400a: one plate face
4b, 400b: other plate face
5, 500: board-like cooling fin
6, 600: housing
6d, 600d: inner circumferential wall
63, 609, 610: slit

MODE FOR CARRYING CUT THE INVENTION

Hereinafter, the examples of best mode for carrying out the illuminating lamp of this invention are explained with reference to the views. Fig.1 is the whole perspective view which shows one best mode of embodiment by the illuminating lamp 1 of this invention. Fig.2 is the front view which shows the state which saw the illuminating lamp 1 of this invention from the light source side. Fig.3 is the plane view which shows the state which saw the illuminating lamp 1 of Fig.2 from the upper surface. Fig.4 is the left side view which shows the state which saw the illuminating lamp 1 of Fig.2 from the left side. Fig.5 is the right side view which shows the state which saw the illuminating lamp 1 of Fig.2 from the right side. Fig.6 is the bottom view which shows the state which saw the illuminating lamp 1 of Fig.2 from the lower surface. Fig.7 is the back view which shows the state which saw the illuminating lamp 1 of Fig.2 from the back surface. Fig.8 is the sectional view which shows the section XX in Fig.2. Fig.9 is the sectional view which shows the section YY in Fig.2. Fig.10 is the sectional view which shows the section ZZ in Fig.7. In addition, the same numeral is given to the same component throughout the whole of the views concerning the illuminating lamp 1. And, in Fig.1, the projector is omitted. Besides, in Fig.1 and Fig.2, because the protective cover 3 is transparent, the projector 2 is shown with the continuous line.
As shown in Fig.1-Fig.9, the illuminating lamp 1 of this invention is provided with the attaching substrate 4 which is fixed to one plate face 4a so that the plural projectors 2 that the LED is the light source are fixed planarly and the protective cover 3 that the light is permeable covers the plural projectors 2, the plural board-like cooling fins 5 which are fixed in the state which protrudes from the other plate face 4b of the attaching substrate 4 to dissipate the heat which is generated in the plural projectors 2, and the housing 6 which has the storing concave part 6a, and that the attaching substrate 4 is fixed so that the plural board-likre cooling fins 5 are positioned in the inside of the aforementioned storing concave part 6a and so that the protective cover 3 is positioned in the aperture plane side of the aforementioned storing concave part 6a respectively. The illuminating lamp 1 like this has the figure that the outer shape is combined with the truncated cone 1a and the cylinder 16 which is provided in the large side of the outer diameter of the truncated cone 1a, and the open end 6b which becomes the aperture plane of the housing 6 is formed in a circle. In addition, the projector 2 can disperse the oriented light which is generated from the LED by the lens part, and in the view, 64 projectors are arranged in a circle as the annual ring.
The housing 6 is the outer shape of the illuminating lamp 1, and has the figure that the part of the hollow truncated cone 1a and the part of the hollow approximate cylinder 1b which is provided in the large side of the outer diameter of the part of the hollow truncated cone 1a are combined, and the open end 6b is formed in a circle. The socket body 61 comprising the cylindrical member which houses the power unit for supplying the predefined electric power to each projector 2 and has the bottom is provided in the small side of the outer diameter of the part of the truncated cone 1a so that a part of the socket body 61 protrudes from the upper wall 6c. The U-shaped handle 62 is fixed in the portion that a part of this socket body 61 protrudes. And, the plural slits 63 are holed over the whole on the peripheral wall of the part of the truncated cone 1a of the housing 6. Besides, as shown in Fig. 2 and Fig.10, the bracket 64, 65 for fixing the attaching substrate 4 at two places in the line of the diametrical direction are provides at the inner peripheral wall 6d in the open end 6b of the housing 6. For example, it is preferable that the housing 6 like this is formed by the metal such as magnesium alloy, aluminum alloy and copper whose thermal conductivity is high. And, because the illuminating lamp 1 becomes easy to install by the weight-saving, the magnesium alloy is suitable. Especially, in the case of the large illuminating lamp 1, the easiness for installing by the weight-saving is remarkable.
Next, the attaching substrate 4 that the plural projectors 2, the protective cover 3 and the plural board-like cooling fins 5 are attached is explained basad on Fig.11-Fig.18.
Fig.11-Fig.18 are the views which show the state that the projector 2, the protective cover 3 and the plural board-like cooling fins 5 which are a part of the component of the illuminating lamp of this invention are attached to the attaching substrate 4. Fig.11 is the front view which shows the state of the attaching substrate 4 in the case which saw the illuminating lamp of this invention from the light source side. Fig.12 is the plane view which shows the state of the attaching substrate 4 in the case which saw the illuminating lamp of this invention from the upper surface. Fig. 13 is the left side viewwhich shows the state of the attaching substrate 4 in the case which saw the illuminating lamp of this invention from the left side. Fig.14 is the right side view which shows the state of the attaching substrate 4 in the case which saw the illuminating lamp of this invention from the right side. Fig.15 is the bottom view which shows the state of the attaching substrate 4 in the case which saw the illuminating lamp of this invention from the lower surface. Fig.16 is the back view which shows the state of the attaching substrate 4 in the case which saw the illuminating lamp of this invention from the back. Fig.17 is the sectional view which shows the section XX in Fig.11. Fig.18 is the sectional view which shows the section YY in Fig.11. In addition, in Fig.11-Fig.15, because the protective cover 3 is transparent, the projector 2 is shown with the continuous line.
As shown in Fig.2, the attaching substrate 4 is formed so that the space S for taking the external air occurs between the inner peripheral wall 6d in the part of the approximate cylinder 1b of the housing 6. Concretely, as shown in Fig.2 and Fig.11-Fig.18, the attaching substrate 4 is composed from the base 4c comprising the circular plate which is formed with the smaller outer diameter than the inner diameter in the part of the approximate cylinder 1b of the housing 6 and the attaching base 4d, 4e which is formed so as to protrude to the diametrical direction from the outer diameter of the base 4c in the line of the aforementioned diametrical direction to fix the attaching substrate 4 to the bracket 64, 65 which are provided at the inner peripheral wall 6d in the open end 6b of the housing 6. By putting this attaching base 4d, 4e on the bracket 64, 65 of the housing 6, and for example, by screwing with the screw 66 which is shown in Fig. 4, Fig. 5 and Fig.7, the attaching substrate 4 can be built into the housing 6.
As shown in Fig.11-Fig.15, Fig.17 and Fig.18, the protective cover 3 is formed so as to cover the plural projectors 2 along the outer circumference of the attaching substrate 4, the part of the outside is formed by the step low, and this step part 31 is fixed to one plate face 4a by using such as the screw. This protective cover 3 is formed by the transparent synthetic resin such as polycarbonate, acrylic resin. And, the step part 31 of the protective cover 3 is covered by the edge cover 32 which is fixed to the attaching substrate 4.
As shown in Fig.11-Fig.18, Fig.1 and Fig.2, the plural board-like cooling fins 5 protrude on the space S for taking the external air and are formed so as to be cooled by the external air which enters from the aforementioned space S for taking the external air. Concretely, the board-like cooling fin 5 is formed in a rectangle, and is arranged along the perpendicular direction for the diametrical direction that the longitudinal direction is the direction which forms the attaching base 4d, 4e of the attaching substrate 4. And, the plural board-like cooling fins 5 are arranged in the equal distances along the diametrical direction which forms the attaching base 4d, 4e of the attaching substrate 4. The distance between these board-like cooling fins 5 is formed by the narrow space where the venturi effect occurs in the inside of the housing 6. For example, in the case that the maximum diameter is 430mm and the length is 500mm in the housing 6, it is possible to cause the venturi effect by arranging the board-like cooling fins 5 of the plate thickness of 1mm in 5mm distance. In this way, by forming the distance between the board-like cooling fins 5, the flow velocity of the external air which passes between these board-like cooling fins 5 can be increased.
The both end parts of each board-likie cooling fin 5 are formed along the inner peripheral wall 6d in the part of the approximate cylinder 1b of the housing 6, besides, the area of occupancy in the inside of the space S for taking the external air of the plural board-like cooling fins is the size that the animal such as the bird cannot enter into the inside of the storing concave part 6a of the housing 6 from the aperture plane. Because the conventional illuminating lamp has the sealed structure, the animal such as the bird does not enter. However, in the illuminating lamp 1 of this invention, the space S for taking the external air is formed between the attaching substrate 4 and the inner peripheral wall 6d of the housing 6, therefore, it is utilized that the plural board-like cooling fins 5 protrude to the space S for taking the external air, concerning the area of occupancy in the space S for taking the external air of the plural board-like cooling fins 5, the animal such as the bird cannot enter into the inside of the storing concave part 6a of the housing 6 from the aperture plane. In the board-like cooling fin 5 like this, the same thermally-conductive material as the attaching substrate 4 is preferable. Because the thermal conductivity becomes same in the attaching substrate 4 and the board-like cooling fin 5 by the same thermally-conductive material, the heat-transfer efficiency becomes well. As the thermally-conductive material of these attaching substrate 4 and board-like cooling fin 5, as well as the housing 6, for example, it is preferable to be formed by the metal whose thermal conductivity is high such as magnesium alloy, aluminum alloy and copper. And, because the illuminating lamp 1 becomes easy to install by the weight-saving, the magnesium alloy is suitable. In addition, any one of the attaching substrate 4 and the board-like cooling fin 5 may be formed by the metal whose thermal conductivity is high such as magnesium alloy, aluminum alloy and copper.
This attaching substrate 4 that the plural projectors 2, the protective cover 3 and the plural board-like cooling fins 5 are attached is arranged in the part of the cylinder 1b of the housing 6, and the socket body 61 is arranged in the part of the truncated cone 1a of the housing 6.
In this way, concerning the illuminating lamp 1 that the air flow path for flowing the external air which inflows from the space S for taking the external air which is the inflow flow path is formed in the inside of the housing 6, the behavior which disperses the thermal energy which is generated by the emission of the plural LEDs to the external is explained.
When the plural projectors 2 emit light by the lighting of the illuminating lamp 1, because the heat which is generated in each LED transmits o the plural board-like cooling fins 5 through the attaching substrate 4, the ascending current of the heat occurs by the heat which is radiated from the plural board-like cooling fins 5 and the external air is inhaled from the space S for taking the external air. Because the inhaled external air passes the narrow space between the plural board-like cooling fins 5, the flow velocity of the ascending current of the heat increases by the venturi effect, and a large quantity of air than the normal atmosphere condition passes between the plural board-like cooling fins 5. Further, the external air which is warmed by the thermolytic action of the plural bosrd-like cooling fins 5 and enters from the space S for taking the external air is discharged to the external by the plural slits 63 which are positioned at the upper direction than the plural board-like cooling fins 5.
In this way, the external air can be taken efficiently to the inside of the space of the lamp fitting, and the external air can be introduced directly to the board-like cooling fin 5, besides the external air can be discharged to the slit 63. Thereby, the cooling efficiency can be improved considerably. Therefore, it is suitable to the high power LED whose amount of heat generation is large.
In addition, the above-mentioned illuminating lamp 1 has the figure that the outer shape is combined with the truncated cone 1a and the cylinder 1b which is provided in the large side of the outer diameter of the truncated cone 1a, and the open end 6b which becomes the aperture plane of the housing 6 is formed in a circle. However, as well as this, as shown in Fig.19-Fig.26, the illuminating lamp 100 whose outer shape is the figure which comprised the truncated pyramid 100a, and whose aperture plane is formed in a rectangle is also possible.
Fig. 19 is the view which shows one best mode of embodiment by the illuminating lamp 100 of this invention, and is the frost view which shows the state which saw the illuminating lamp 100 of this invention from the light source side. Fig.20 is the plane view which shows the state which saw the illuminating lamp 100 of Fig.19 from the upper surface. Fig.21 is the left side view which shows the state which saw the illuminating lamp 100 of Fig.19 from the left side. Fig. 22 is the right side view which shows the state which saw the illuminating lamp 100 of Fig.19 from the right side. Fig.23 is the bottom view which shows the state which saw the illuminating lamp 100 of Fig.19 from the lower surface. Fig.24 is the back view which shows the state which saw the illiminating lamp 100 of Fig.19 from the back surface. Fig.25 is the sectional view which shows the section XX in Fig.9. Fig.26 is the sectional view which shows the section YY in Fig.19. In addition, the same numeral is given to the same component throughout the views concerning the illuminating lamp 100. And, because the protective cover 300 is transparent in Fig.19, the projector 200 is shown with the continuous line.
As shawn in Fig.19-Fig.26, the illuminating lamp 100 of this invention is provided with the attaching substrate 400 which is fixed to one plate face 400a so that the plural projectors 200 that the LED is the light source are fixed planarly and the protective cover 300 that the light is permeable covers the plural projectors 200, the plural board-like cooling fins 500 which are fixed in the state which protrudes from the other plate face 400b of the attaching substrate 400 to dissipate the heat which is generated in the plural projectors 200, and the housing 600 which has the storing concave part 600a, and that the attaching substrate 400 is fixed so that the plural board-like cooling fins 500 are positioned in the inside of the aforementioned storing concave part 600a and so that the protective cover 300 is positioned in the aperture plane side of the aforementioned storing concave part 600a respectively. In addition, as well as the above-mentioned projector 2 of the illuminating lamp 1, the projector 200 can irradiate the oriented light which is generated from the LED by the lens part in the wide angle, and in the view, 32 projectors which are divided in the 6 lines are arranged.
The housing 600 is the outer shape of the illuminating lamp 100, and is the figure which comprises the hollow truncated pyramid 100a, and the open end 600b which becomes the aperture plane of the housing 600 is formed in a rectangle. The power-supply box 601 that the power unit for supplying the predefined electric power to each projector 2 (200?) is housed is fixed in the upper wall 600c of this housing 600. And, The U-shaped handle 604 is fixed by the screw 605, 606 in the neighborhood of the open end 600b of a pair of side face 602, 603 which becomes the opposite side of the housing 600. Further, the plural slits 609, 610 are holed respectively in a pair of side face 607, 608 which becomes the opposite side which is different from a pair of side face 602, 603 of the housing 600. The position that these plural slits 609, 610 are provided in the housing 600 is decided to the rising direction of the external air which is warmed by the thermolytic action of the plural board-like cooling fins 500 depending on the irradiation direction of LED of the projector 200. By deciding the position of the slit in this way, because the heat which is dissipated from the plural board-like cooling fins 500 efficiently can be discharged to the external, the cooling efficiency can be improved. For example, it is preferable that the housing 600 like this is formed by the metal such as magnesium alloy, aluminum alloy and copper whose thermal conductivity is high. And, because the illuminating lamp 100 becomes easy to install by the weight-saving, the magnesium alloy is suitable. Especially, in the case of the large illuminating lamp 100, the easiness for installing by the weight-saving is remarkable.
Next, the attaching substrate 400 that the plural projectors 200, the protective cover 300 and the plural board-like cooling fins 500 are attached is explained based on Fig.27-Fig.34.
Fig.27-Fig.34 are the views which show the state that the projector 200, the protective cover 300 and the plural board-like cooling fins 500 which are a part of the component of the illuminating lamp of this invention are attached to the attaching substrate 400. Fig.27 is the front view which shows the state of the attaching substrate 400 in the case which saw the illuminating lamp of this invention from the light source side. Fig.28 is the plane view which shows the state of the attaching substrate 400 in the case which saw the illuminating lamp of this invention from the upper surface. Fig.29 is the left side view which shows the state of the attaching substrate 400 in the case which saw the illuminating lamp of this invention from the left side. Fig.30 is the right side view which shows the state of the attaching substrate 400 in the case which saw the illuminating lamp of this invention from the right side. Fig.31 is the bottom view which shows the state of the attaching substrate 400 in the case which saw the illuminating lamp of this invention from the lower surface. Fig.32 is the back view which shows the state of the attaching substrate 400 in the case which saw the illuminating lamp of this invention from the back. Fig.33 is the sectional view which shows the section XX in Fig.27. Fig.34 is the sectional view which shows the section YY in Fig.27. In addition, in Fig.27-Fig.31, because the protective cover 300 is transparent, the projector 200 is shown with the continuous line.
As shown in Fig.19, the attaching substrate 400 is formed so that the space S for taking the external air occurs between each inner peripheral wall 600d of a pair of side face 607, 608 of the housing 600. In this attaching substrate 400, the attaching base 400c, 400d for fixing to a pair of side face 602, 603 by using the screw 605, 606 which fix the U-shaped handle 604 is formed in the neighborhood of the open end 600b of a pair of side face 602, 603 of the housing 600. By fitting this attaching base 400c, 400d to the open end 600b which becomes the aperture plane of the housing 600, and by strewing the attaching base 400c, 400d to a pair of side face 602, 603 by the screw 605, 606, the attaching substrate 400 can be incorporated to the housing 600.
As shown in Fig.27-Fig.31, Fig.33 and Fig.34, the protective cover 300 is formed so as to cover the plural projectors 200 along the outer circumference of the attaching substrate 400, the part of the outside is formed by the step low, and this step part 301 is fixed to one plate face 400a by using such as the screw. This protective cover 300 is formed by the transparent synthetic resin such as polycarbonate, acrylic resin. And, the step part 301 of the protective cover 300 is covered by the edge cover 302 which is fixed to the attaching substrate 400.
As shown in Fig. 27 -Fig. 34 and Fig.19, the plural board-like cooling fins 500 protrude on the space S for taking the external air and are formed so as to be cooled by the external air which enters from the aforementioned space S for taking the external air. Concretely, the bond-like cooling fin 500 is formed in a rectangle, and is fixed to the attaching substrate 400 so that the longitudinal direction runs along a pair of side face 602, 603 of the housing 600 when the attaching substrate 400 is incorporated in the housing 600. And, the plural board-like cooling fins 500 are arranged in the equal distances along a pair of side face 607, 608 of the housing 600. The distance between these board-like cooling fins 5 is formed by the space where the venturi effect occurs in the inside of the housing 600. In this way, by forming the distance between the board-like cooling fins 500, the flow velocity of the external air which passes between these board-like cooling fins 500 can be increased.
The end parts of each board-like cooling fin 500 are formed along a pair of side face 607, 608 of the lousing 600, besides, the area of occupancy in the inside of the space S for taking the external air of the plural board-like cooling fins is size that the animal such as the bird cannot enter into the inside of the storing concave part 600a of the housing 600 from the aperture plane. Because the conventional illuminating lamp has the sealed structure, the animal such as the bird does not enter. However, in the illuminating lamp 100 of this invention, the space S for taking the external air is formed between the attaching substrate 400 and the inner peripheral wall 600d of the housing 600, therefore, it is utilized that the plural board-like cooling fins 500 protrude to the space S for tasking the external air, concerning the area of occupancy in the space S for taking the external air of the plural board-like cooling fins 500, the animal such as the bird cannot enter into the inside of the storing concave part 600a of the housing 600 from the aperture plane. In the board-like cooling fin 500 like this, the same thermally-conductive material as the attaching substrate 400 is preferable. Because the thermal conductivity becomes same in the attaching substrate 400 and the board-like cooling fin 500 by the same thermal ly-conductive material, the heat-transfer efficiency becomes well. As the thermally-conductive material of these attaching substrate 400 and board-like cooling fin 500, as well as the housing 600, for example, it is preferable to be formed by the metal whose thermal conductivity is high such as magnesium alloy, alumimm alloy and copper. And, because the illuminating lamp 100 becomes easy to install by the weight-saving, the magnesium alloy is suitable.
This attaching substrate 400 that the plural projectors 200, the protective cover 300 and the plural boaid-likre cooling fins 500 are attached is arranged in the space of approximately 1/2 of the open end 600b side of the housing 600, and the power-supply box 601 is arranged in the space of approximately 1/2 of the upper wall 600c side in the residual space of the housing 600.
In this way, concerning the illuminating lamp 100 that the air flow path for flowing the external air which flows from the space S for taking the external air which is the inflow flow path is formed in the inside of the housing 600, the behavior which disperses the thermal energy which is generated by the emission of the plural LEDs to the external is explained.
When the plural projectors 200 emit light by the lighting of the illuminating lamp 100, because the heat which is generated in each LED transmits to the plural board-like cooling fins 500 through the attaching substrate 400, the ascending current of the heat occurs by the heat which is radiated from the plural board-like cooling fins 500 and the external air is inhaled from the space S for taking the external air. Because the inhaled external air passes the narrow space between the plural board-like cooling fins 500, the flow velocity of the ascending current of the heat increases by the venturi effect, and a large quantity of air than the normal atmosphere condition passes between the plural board-like cooling fins 500. Further, for example, when the plural slits 609 which are holed on the side face 607 are positioned at the upper direction than the plural board-like cooling fins 500, concerning the external air which is warmed by the thermolytic action of the plural board-like cooling fins 500 and enters from the space S for taking the external air, much air is discharged to the external from the plural slits 609 by the ascending current of the heat.
In this way, the external air can be taken efficiently to the inside of the space of the lamp fitting, and the external air can be introduced directly to the board-like cooling fin 500, besides the external air can be discharged to the slit 609. Thereby, the cooling efficiency can be improved considerably. Therefore, it is suitable to the high power LED whose amount of heat generation is large.
Heretofore, the explanation was performed by the particular mode of embodiment shown in the view about this invention. However, this invention is not limited to the mode of embodiment shown in the view. And, any constitution which is known heretofore can be adapted obviously insofar as the effect of this invention is achieved.

INDUSTRIAL APPLICABILITY

Concerting the illuminating lamp of this invention, it is possible to be utilized as the illumination such as the car park, the street light, the hall, the marshaling yard of the train or the light-up of the building.

Claims

An illuminating lamp, characterized by comprising:
an attacking substrate fixed to one plate face so that plural projectors that a light-emitting diode is light source are fixed planarly and a protective cover that light is permeable covers said plural projectors,

plural board-like cooling fins fixed in the state which protrudes from the other plate face of said attaching substrate to dissipate heat which is generated in said plural projectors, and

a housing which has a storing concave part, and that said attaching substrate is fixed so that said plural board-like cooling fins are positioned in the inside of the aforementioned storing concave part and so that said protective cover is positioned in an aperture plane side of the aforementioned storing concave part respectively,

wherein said attaching substrate is formed so that a space for taking the external air occurs between inner peripheral walls of said housing,

said plural board-like cooling fins protrude on said space for taking the external air and are formed so as to be cooled by said external air which enters from the aforementioned space for taking the external air, and

said housing is provided with plural slits for discharging said external air which is warmed by a thermolytic action of said plural board-like cooling fins and enters from said space for taking the external air to an external.
The illuminating lamp According to claim 1, characterized in that:
an area of occupancy in the inside of said space for taking the external air of said plural board-like cooling fins is a size that an animal such as a bird cannot enter into the inside of said storing concave part of said housing from said aperture plane.
The illuminating lamp according to claim 1 or claim 2, characterized in that:
said attaching substrate and said board-like cooling fin are same thermally-conductive materials.
The illuminating lamp according to any one of claims 1 to 3, characterized in that:
at least aforementioned housing among said housing, said attaching substrate and said board-like cooling fin is formed by magnesium alloy.
The illuminating lamp according to any one of clams 1 to 4, characterized in that:
a position that said slit is provided in said housing is decided to a rising direction of said external air which is warmed by the thermolytic action of said plural board-like cooling fins depending on an irradiation direction of said light-emitting diode.