CN102654274A

CN102654274A - LED (light-emitting diode) condenser lens

Info

Publication number: CN102654274A
Application number: CN2011100528822A
Authority: CN
Inventors: 周明杰; 罗英达
Original assignee: Oceans King Lighting Science and Technology Co Ltd; Shenzhen Oceans King Lighting Engineering Co Ltd
Current assignee: Oceans King Lighting Science and Technology Co Ltd; Shenzhen Oceans King Lighting Engineering Co Ltd
Priority date: 2011-03-04
Filing date: 2011-03-04
Publication date: 2012-09-05
Anticipated expiration: 2031-03-04
Also published as: CN102654274B

Abstract

The invention discloses an LED (light-emitting diode) condenser lens. The condenser lens is a circular rotational part and is provided with an optical axis which is coincided with a rotating shaft of the circular rotational part, and the condenser lens comprises a light source containing slot which corresponds to a small end of the condenser lens, an out-light surface corresponding to a big end of the condenser lens and a fully reflecting surface arranged on the outer side wall of the condenser lens, the middle part of the out-light surface is sunk inward, a conical surface part which is arranged at the middle part of the out-light surface and protrudes outward and a plane part which surrounds the conical surface are formed, and the bottom wall of the light source containing slot and the conical surface part jointly define a central condensation part. Compared with the prior art, the LED condenser lens disclosed by the invention has high-efficiency condensation function to an LED, rays emitted by the LED are affected by the LED condenser lens and emergent lights of the rays are almost parallel to the optical axis, and a light emitting angle is small; the LED condenser lens disclosed by the invention can greatly improve utilization rate of a lighting fixture to luminous flux of the LED while the condensation function is guaranteed; besides, processing and forming of the LED condenser lens disclosed by the invention are relatively simple.

Description

A kind of LED collector lens

Technical field

The present invention relates to LED (Light Emitting Diode, light emitting diode) collector lens technical field, more particularly, relate to a kind of lens with high-effective concentration function.

Background technology

In order to realize optically focused to LED; A kind of way of prior art is to adopt to have paraboloidal reflector realization optically focused; But this mode but is difficult to be applied to the luminous angle occasion of little (as spending less than 5 when luminous angle); Must the reflector size be increased, otherwise the less light in luminous angle can't be utilized, increase the luminous angle of light the most at last.

Also occurred adopting convex lens that LED is carried out the technical scheme of optically focused in the prior art, but there is the lower problem of LED luminous flux utilization rate in these schemes, be in particular in that the bigger light in luminous angle can't be utilized, and has finally reduced the light efficiency of light fixture.

In addition; Some new LED collector lenses have also appearred in the prior art; The material of lens is generally PC (Poly Carbonate, Merlon) or PMMA (Polymethyl Methacrylate polymethyl methacrylate), and its principle is to utilize the total reflection and the refraction of light; Be made into the lens of comparison optically focused, realize converging light.But defectives such as these LED collector lenses exist moulding process to have relatively high expectations usually, and difficulty of processing is bigger.

Summary of the invention

Technical problem to be solved by this invention is to provide a kind of LED collector lens, and it has light-focusing function efficiently, and has higher LED luminous flux utilization rate.

For solving the problems of the technologies described above; A kind of technical scheme of the present invention is: a kind of LED collector lens is provided; Said collector lens is the revolving body that is round table-like; And has an optical axis that overlaps with its gyroaxis; Said collector lens comprises the exiting surface of the light source holding tank of corresponding collector lens small end, the big end of corresponding collector lens and the fully reflecting surface that is positioned at the collector lens lateral wall, and the middle part of said exiting surface caves inward, and forms and to be positioned at exiting surface middle part and outwards outstanding conical surface part and around the planar section of said conical surface part; The summit of said conical surface part is positioned on the said optical axis, and the diapire of said light source holding tank and said conical surface part define a center optically focused part jointly.

More specifically, the summit and the said planar section of said conical surface part are positioned at same plane.

More specifically, the angle theta of the bus of said conical surface part and said optical axis satisfies following formula:

In the formula, n is the refractive index of lens material, and the value of α is between 5-10 °.

More specifically, the refractive index n of said lens material is 1.59, and the angle theta of said bus and said optical axis is 67 °.

More specifically, said light source holding tank is the cylindrical groove of a main shaft and said optical axis coincidence, the equal diameters of the diameter of light source holding tank and said conical surface part.

More specifically, the diameter of said light source holding tank is not more than 9 millimeters, and the degree of depth is not more than 4 millimeters.

More specifically, the bus of said revolving body is formed by connecting on the multistage line segment from beginning to end, and by said small end to said big end, the angle between said multistage line segment and the said optical axis reduces successively.

More specifically, the angle β of said multistage line segment and optical axis satisfies following formula:

In the formula, n is the refractive index of lens material, and m is for to begin from said small end, the sequence number number of each line segment in the said multistage line segment, and the value of λ is between 4-6 °.

More specifically, the value of λ is 5 °, and said multistage line segment comprises 13 sections line segments.

For solving the problems of the technologies described above; Another kind of technical scheme of the present invention is: a kind of LED collector lens is provided; Said collector lens is to be intersected and become one and constitute by above-mentioned LED collector lens; The planar section of said a plurality of collector lens exiting surfaces is positioned at same plane, and each conical surface part summit evenly distributes in the plane.

Compared with prior art, the present invention has light-focusing function efficiently to LED, and the light that LED sends is after LED collector lens of the present invention effect, and its emergent light is almost parallel with optical axis, and luminous angle is very little; When guaranteeing light-focusing function, the present invention also can greatly improve the utilization rate of light fixture to the LED luminous flux; In addition, the machine-shaping of LED collector lens of the present invention is also simple relatively, and it is very little that its size can be done, and helps realizing the miniaturization of light fixture.

Description of drawings

Fig. 1 is the schematic perspective view of the embodiment of the invention one;

Fig. 2 is the schematic side view of Fig. 1;

Fig. 3 is the cross-sectional schematic of Fig. 1;

Fig. 4 is a light path principle figure embodiment illustrated in fig. 1;

Fig. 5 is distribution curve flux figure embodiment illustrated in fig. 1;

Fig. 6 is the schematic perspective view of the embodiment of the invention two.

The specific embodiment

In order to make technical problem to be solved by this invention, technical scheme and beneficial effect clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.

Please referring to figs. 1 through Fig. 3; Be embodiments of the invention one; Said collector lens L is the revolving body that is round table-like; And having the optical axis A that overlaps with its gyroaxis, said collector lens comprises the exiting surface 2 of the light source holding tank 1 of corresponding collector lens small end, the big end of corresponding collector lens and the fully reflecting surface 3 that is positioned at the collector lens lateral wall.The middle part of said exiting surface 2 caves inward, and forms and to be positioned at exiting surface middle part and outwards outstanding conical surface part 21 and around the planar section 22 of said conical surface part 21, the summit of said conical surface part 21 is positioned on the said optical axis.The diapire 11 and the said conical surface part 21 of said light source holding tank 1 define a center optically focused part jointly.

Compared with prior art, present embodiment has light-focusing function efficiently to LED, and the light that LED sends is after LED collector lens of the present invention effect, and its emergent light is almost parallel with optical axis, and luminous angle is very little; When guaranteeing light-focusing function, the present invention also can greatly improve the utilization rate of light fixture to the LED luminous flux; In addition, the machine-shaping of LED collector lens of the present invention is also simple relatively, and it is very little that the collector lens size can be done, and helps realizing the miniaturization of light fixture.

Below present embodiment is done further to introduce in detail.

Please with reference to Fig. 3 and Fig. 4, the summit of said conical surface part 21 is positioned on the said optical axis, and is positioned at same plane with said planar section 22.The summit that is said conical surface part 21 overlaps with the center of circle of said planar section 22.

In the present embodiment, the angle theta of the bus of said conical surface part 21 and said optical axis A satisfies following formula:

Preferable scheme is that the employing refractive index is 1.59 PC material, and the bus of said conical surface part 21 and the angle theta of said optical axis are 67 °.

Like this; The center optically focused part that defines jointly by said diapire 11 and said conical surface part 21; Can play the effect of refraction to the smaller light in the luminous angle of LED; Emergent ray after said center optically focused partly reflects almost is parallel to optical axis A, and the luminous angle of emergent light is very little, has reached fabulous optically focused performance.

Please continue with reference to Fig. 3 and Fig. 4, said light source holding tank 1 is the cylindrical groove that a main shaft overlaps with said optical axis A, the equal diameters of its diameter D and said conical surface part 21.Preferable scheme is, the diameter of said light source holding tank is not more than 9 millimeters, and the degree of depth is not more than 4 millimeters.

Please combine with reference to Fig. 2 and Fig. 3, the bus of present embodiment revolving body is formed by connecting 13 sections line segments (being the line segment 301-313 shown in Fig. 2) head and the tail.Thereby said fully reflecting surface 3 is made up of 13 round table surface.Small end by said collector lens is held to big, and the angle between said 13 sections line segments and the said optical axis reduces successively.

The angle β of said multistage line segment and optical axis A satisfies following formula:

In the present embodiment, 5 ° of the values of λ, like this, the angle between said 13 sections line segments and the optical axis A is as shown in the table respectively:

The angle of line segment 301 and optical axis A	45.00°
		The angle of line segment 302 and optical axis A	43.43°
The angle of line segment 303 and optical axis A	41.87°
		The angle of line segment 304 and optical axis A	40.32°
The angle of line segment 305 and optical axis A	38.79°
		The angle of line segment 306 and optical axis A	37.30°
The angle of line segment 307 and optical axis A	35.84°
		The angle of line segment 308 and optical axis A	34.43°
The angle of line segment 309 and optical axis A	33.08°
		The angle of line segment 310 and optical axis A	31.80°
The angle of line segment 311 and optical axis A	30.60°
		The angle of line segment 312 and optical axis A	29.50°
The angle of line segment 313 and optical axis A	28.50°

Please with reference to Fig. 4, in the light that LED penetrates, during the said fully reflecting surface 3 of the bigger light directive in these luminous angles that get into by light source holding tank 1, total reflection takes place promptly.And the light of the overwhelming majority is reflected; The direction of propagation of reflection ray is also almost parallel with optical axis A, and penetrates from the planar section 22 of said exiting surface 2, behind the said planar section 22 of process; Deflection phenomenon can not take place in light basically yet, still propagates along the direction that is parallel to optical axis A.The luminous angle of emergent light is very little, has reached fabulous optically focused performance.

The collector lens of present embodiment is injection molded by transparent material.Can select PC or PMMA.Yes, for other transparent materials, as long as parameters can satisfy present embodiment and propose each item requirement, all can be used as the candidate material that is applied to present embodiment.

And present embodiment is owing to adopt rotary structure, and the machine-shaping of LED collector lens is also simple relatively, and it is very little that its size can be done, and helps realizing the miniaturization of light fixture.By the external diameter of the collector lens of embodiment is 12.1mm, highly is 6.3mm, and whole lens small-sized really realized the miniaturization of light fixture.

Please with reference to Fig. 5, the distribution curve flux figure for present embodiment can be known by this figure, 5 ° of luminous angle less thaies.It is thus clear that present embodiment has light-focusing function efficiently, the light that LED sends is after LED collector lens of the present invention effect, and its emergent light is almost parallel with optical axis, and luminous angle is very little.

Please with reference to Fig. 6, be embodiments of the invention two, said collector lens is to be intersected and become one and constitute by 3 above-mentioned LED collector lens L, and the planar section of said 3 collector lens exiting surfaces is positioned at same plane, and the distance between the conical surface part summit equates.Like this, be triangular arranged between the optical axis of each LED collector lens, therefore 3 led chips can be installed.Certainly, can also adopt 4,5 or 6 LED collector lens L, each conical surface part summit must evenly distribute in the plane.

The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims

1. LED collector lens; Said collector lens is the revolving body that is round table-like; And has an optical axis that overlaps with its gyroaxis; It is characterized in that: said collector lens comprises the exiting surface of the light source holding tank of corresponding collector lens small end, the big end of corresponding collector lens and the fully reflecting surface that is positioned at the collector lens lateral wall, and the middle part of said exiting surface caves inward, and forms and to be positioned at exiting surface middle part and outwards outstanding conical surface part and around the planar section of said conical surface part; The summit of said conical surface part is positioned on the said optical axis, and the diapire of said light source holding tank and said conical surface part define a center optically focused part jointly.

2. LED collector lens as claimed in claim 1 is characterized in that: the summit and the said planar section of said conical surface part are positioned at same plane.

3. LED collector lens as claimed in claim 2 is characterized in that: the bus of said conical surface part and the angle theta of said optical axis satisfy following formula:

4. LED collector lens as claimed in claim 3 is characterized in that: the refractive index n of said lens material is 1.59, and the angle theta of said bus and said optical axis is 67 °.

5. LED collector lens as claimed in claim 1 is characterized in that: said light source holding tank is the cylindrical groove of a main shaft and said optical axis coincidence, the equal diameters of the diameter of light source holding tank and said conical surface part.

6. LED collector lens as claimed in claim 5 is characterized in that: the diameter of said light source holding tank is not more than 9 millimeters, and the degree of depth is not more than 4 millimeters.

7. like any described LED collector lens of claim 1 to 6, it is characterized in that: the bus of said revolving body is formed by connecting on the multistage line segment from beginning to end, and by said small end to said big end, the angle between said multistage line segment and the said optical axis reduces successively.

8. LED collector lens as claimed in claim 7 is characterized in that: the angle β of said multistage line segment and optical axis satisfies following formula:

9. LED collector lens as claimed in claim 8 is characterized in that: the value of λ is 5 °, and said multistage line segment comprises 13 sections line segments.

10. LED collector lens; Said collector lens is to be intersected and become one and constitute like any described LED collector lens of claim 1 to 9 by a plurality of; The planar section of said a plurality of collector lens exiting surfaces is positioned at same plane, and each conical surface part summit evenly distributes in the plane.