WO2012127323A2 - Projection lens apparatus - Google Patents

Projection lens apparatus Download PDF

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Publication number
WO2012127323A2
WO2012127323A2 PCT/IB2012/000699 IB2012000699W WO2012127323A2 WO 2012127323 A2 WO2012127323 A2 WO 2012127323A2 IB 2012000699 W IB2012000699 W IB 2012000699W WO 2012127323 A2 WO2012127323 A2 WO 2012127323A2
Authority
WO
WIPO (PCT)
Prior art keywords
lens
lens group
focusing distance
screen
effective focusing
Prior art date
Application number
PCT/IB2012/000699
Other languages
French (fr)
Other versions
WO2012127323A3 (en
Inventor
Dongha Kim
Mankyum Kim
Byeongsoo Son
Original Assignee
Scram Technologies Asia Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Scram Technologies Asia Limited filed Critical Scram Technologies Asia Limited
Publication of WO2012127323A2 publication Critical patent/WO2012127323A2/en
Publication of WO2012127323A3 publication Critical patent/WO2012127323A3/en

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/16—Optical objectives specially designed for the purposes specified below for use in conjunction with image converters or intensifiers, or for use with projectors, e.g. objectives for projection TV
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/18—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical projection, e.g. combination of mirror and condenser and objective
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor

Definitions

  • the present invention relates to a projection lens apparatus, and more particularly to a projection lens apparatus adapted to enlarge an image of a pixelized panel to form the enlarged image on a screen.
  • FIG. 1 illustrates a conventional projection lens apparatus.
  • the conventional projection lens apparatus for enlarging an image of a pixelized panel PP to form the enlarged image on a screen SC includes : a first lens group G10 including a telecentric lens 110 configured to telecentrically adjust a beam emitting from the panel PP using two lenses, and an achromatic lens 120 having a shape convexly curved toward the panel PP so as to have a positive power and configured to calibrate a chromatic aberration of the beam which has passed through the telecentric lens 110, the first lens group G10 being configured to have a positive power; a second lens group G20 including an aperture stop AS configured to adjust an amount of beams introduced from the first lens group G10, a first lens 130 having a convex lens shape so as to have a positive power and configured to adjust power of the beam introduced through the aperture stop AS, and a second lens 140 having a concave lens shape so as to have a negative power such that the beam introduced from the first lens
  • the second lens 140 of the second lens group G20 is a concave lens having a negative power to achieve a large angle of view
  • a beam passing through the second lens 140 spreads out at a wide angle with respect to a central axis thereof. (That is, the size of the beam is enlarged)
  • the non- spherical lens 50 of the third lens group G30 needs to have an effective diameter corresponding to the large angle of view, i.e. a large diameter.
  • an object of the present invention is to provide a projection lens apparatus adapted to reduce a diameter of a lens closest to a screen, i.e. the non-spherical lens of the third lens group of the conventional projection lens apparatus .
  • a projection lens apparatus for enlarging an image of a pixelized panel to form the enlarged image on a screen, including: a first lens group including a telecentric lens configured to telecentrically adjust a beam emitting from the panel, and an achromatic lens configured to calibrate a chromatic aberration of the beam which has passed through the telecentric lens, the first lens group being configured to have a positive power; a second lens group including an aperture stop configured to adjust an amount of beams introduced from the first lens group, a first lens having a convex lens shape so as to have a positive power and configured to adjust power of the beam introduced through the aperture stop, and a second lens having a meniscus shape concavely curved toward the screen to reduce a size of the beam introduced from the first lens, the second lens group being configured to have a positive power; and a third lens group configured to calibrate a distortion of the beam introduced from the second lens group, using a non-spherical lens having
  • Fl/FO is set to be larger than 1.3 and smaller than 2.4.
  • an effective focusing distance of the second lens group is F2
  • an effective focusing distance of the entire projection lens apparatus is F0
  • an effective focusing distance of the second lens is FL2
  • an effective focusing distance of the first lens is FL1
  • F2/F0 is set to be larger than 1.5 and smaller than 2.2
  • is set to be larger than 1.
  • a positive power of the first lens is the largest of positive powers of all the lenses so that a power of a beam is adjusted.
  • the second lens of the second lens group has a meniscus shape concavely curved toward the screen to reduce a size of a beam and the second lens group has a positive power, a lens closest to the screen, i.e. the non-spherical lens of the third lens group can become smaller. Thus, a thickness of the entire projection system can be reduced.
  • FIG. 1 is a view illustrating a conventional projection lens apparatus
  • FIG. 2 is a view illustrating a feature of a second lens of FIG. 1;
  • FIG. 3 is a view illustrating a projection lens apparatus according to an embodiment of the present invention.
  • FIG. 4 is a view illustrating a projection lens apparatus according to another embodiment of the present invention.
  • FIG. 5 is a view illustrating a feature of a second lens of the projection lens according to the embodiment of the present invention.
  • a projection lens apparatus for enlarging an image of a pixelized panel PP to form the enlarged image on a screeen SC includes: a first lens group Gl including a telecentric lens 10 configured to telecentrically adjust a beam emitting from the panel PP, and an achromatic lens 20 configured to calibrate a chromatic aberration of the beam which has passed through the telecentric lens 10, the first lens group Gl being configured to have a positive power; a second lens group G2 including an aperture stop AS configured to adjust an amount of beams introduced from the first lens group Gl, a first lens 30 having a convex lens shape so as to have a positive power and configured to adjust power of the beam introduced through the aperture stop AS, and a second lens 40 having a meniscus shape concavely curved toward the screen SC to reduce a size of the beam introduced from the first lens 30, the second lens group G2 being configured to have a positive power; and a third lens group G3
  • F1/F0 is set to be larger than 1.3 and smaller than 2.4.
  • an effective focusing distance of the second lens group G2 is F2
  • an effective focusing distance of the entire projection lens apparatus is F0
  • an effective focusing distance of the second lens 40 is FL2
  • an effective focusing distance of the first lens 30 is FL1
  • F2/F0 is set to be larger than 1.5 and smaller than 2.2
  • is set to be larger than 1.
  • a positive power of the first lens 30 is the largest of positive powers of all the lenses (the telecentric lens 10, the achromatic lens 20, the first lens 30, the second lens 40, and the non-spherical lens 50) so that a power of a beam is adjusted.
  • the first lens group Gl can be moved forward or rearward to adjust a focus of the entire projection lens apparatus .
  • the telecentric lens 10 functions to telecentrically adjust a beam emitting from the panel PP using at least one lens.
  • a beam emitting from the panel PP can be telecentrically adjusted using two lenses, or as illustrated in FIG. 4, a beam emitting from the panel PP can be telecentrically adjusted using one lens.
  • at least one of the lens or the lenses should be a positive power.
  • the telecentric adjustment of a beam refers to transmission of light almost perpendicular to the panel PP to the screen SC.
  • the telecentric lens 10 pertains to a well-known technology, and a detailed description thereof will be omitted.
  • the achromatic lens 20 is disposed parallel to the telecentric lens 10 such that a beam emitting from the telecentric lens 10 is introduced therethrough, and is a combined lens system configured to calibrate a chromatic aberration of a lens. That is, several lenses having different components are combined to offset chromatic aberrations of the lenses.
  • the achromatic lens 20 according to the present invention is a lens (usually, called a doublet) where two lenses are combined, may have a meniscus shape convexly curved toward the screen SC as in FIG. 3 or have a meniscus shape concavely curved toward the screen as in FIG. 4 according to a condition of the telecentric lens 10. Meanwhile, the first lens group Gl should have a positive power.
  • the aperture stop AS of the second lens group G2 is disposed furthest from the screen SC, and is disposed at a central portion of the entire projection lens apparatus in a suitable way.
  • the first lens 30 of the second lens group G2 is adapted to adjust a power of the entire projection system, and is a convex lens to have a positive power. Then, the first lens 30 is disposed between the aperture stop AS and the second lens 40.
  • the second lens 40 of the second lens group G2 has a meniscus shape concavely curved toward the screen SC, and is disposed closest to the screen SC of the second lens group G2.
  • a meniscus shape refers to a lens (i.e. a crescent-shaped lens) whose two lens surfaces have a same direction, in which case as in FIG. 5, light gathers (light is introduced through a convex surface) while an introduced beam is passing through the second lens 40 such that an exiting beam becomes smaller than the introduced beam.
  • the non-spherical lens 50 of the third lens group G3 through which a beam exiting from the second lens 40 is introduced may be manufactured to correspond to the reduced size of the beam, its diameter may be made smaller.
  • the second lens 40 may be a positive or negative power, but the second lens group G2 should have a positive power.
  • the non-spherical lens 50 of the third lens group G3 has a meniscus shape convexly curved toward the screen SC, and is disposed closest to the screen SC of all the elements of the projection lens apparatus.
  • the third lens group G3 typically includes at least one non-spherical lens .
  • the projection lens apparatus according .to the present invention has an angle of view of 50 degrees or more.
  • the prisms of FIGS. 1, 3, and 4 pertain to a well-known technology, and help share an illumination optical system and a pixelized panel PP.
  • the second lens of the second lens group has a meniscus shape concavely curved toward the screen to reduce a size of a beam and the second lens group has a positive power, a lens closest to the screen, i.e. the non-spherical lens of the third lens group can become smaller. Thus, a thickness of the entire projection system can be reduced.

Abstract

A projection lens apparatus for enlarging an image of a pixelized panel on a screen includes a first lens group, a second lens group, and a third lens group. The first lens group has a positive power and includes a telecentric lens for telecentrically adjusting a beam emitting from the panel, and an achromatic lens for calibrating a chromatic aberration of the beam which has passed through the telecentric lens. The second lens group has a positive power and includes an aperture stop for adjusting an amount of beams introduced from the first lens group, a first lens having a convex lens shape to have a positive power and configured to adjust power of the beam introduced through the aperture stop, and a second lens having a meniscus shape concavely curved toward the screen to reduce a size of the beam introduced from the first lens. The third lens group calibrates a distortion of the beam introduced from the second lens group, using a non-spherical lens having a meniscus shape convexly curved toward the screen so as to have a negative power.

Description

PROJECTION LENS APPARATUS
Field of the invention
The present invention relates to a projection lens apparatus, and more particularly to a projection lens apparatus adapted to enlarge an image of a pixelized panel to form the enlarged image on a screen.
Background of the Invention
FIG. 1 illustrates a conventional projection lens apparatus. The conventional projection lens apparatus for enlarging an image of a pixelized panel PP to form the enlarged image on a screen SC includes : a first lens group G10 including a telecentric lens 110 configured to telecentrically adjust a beam emitting from the panel PP using two lenses, and an achromatic lens 120 having a shape convexly curved toward the panel PP so as to have a positive power and configured to calibrate a chromatic aberration of the beam which has passed through the telecentric lens 110, the first lens group G10 being configured to have a positive power; a second lens group G20 including an aperture stop AS configured to adjust an amount of beams introduced from the first lens group G10, a first lens 130 having a convex lens shape so as to have a positive power and configured to adjust power of the beam introduced through the aperture stop AS, and a second lens 140 having a concave lens shape so as to have a negative power such that the beam introduced from the first lens 130 has a large angle of view, the second lens group G20 being configured to have a negative power; and a third lens group G30 configured to calibrate a distortion of the beam introduced from the second lens group G20, using a non- spherical lens 150 having a meniscus shape convexly curved toward the screen SC so as to have a negative power.
However, in the conventional projection lens apparatus, as illustrated in FIG. 2, since the second lens 140 of the second lens group G20 is a concave lens having a negative power to achieve a large angle of view, a beam passing through the second lens 140 spreads out at a wide angle with respect to a central axis thereof. (That is, the size of the beam is enlarged) . Accordingly, the non- spherical lens 50 of the third lens group G30 needs to have an effective diameter corresponding to the large angle of view, i.e. a large diameter.
Summary Of The Invention
Accordingly, the present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a projection lens apparatus adapted to reduce a diameter of a lens closest to a screen, i.e. the non-spherical lens of the third lens group of the conventional projection lens apparatus .
In order to accomplish this object, there is provided a projection lens apparatus for enlarging an image of a pixelized panel to form the enlarged image on a screen, including: a first lens group including a telecentric lens configured to telecentrically adjust a beam emitting from the panel, and an achromatic lens configured to calibrate a chromatic aberration of the beam which has passed through the telecentric lens, the first lens group being configured to have a positive power; a second lens group including an aperture stop configured to adjust an amount of beams introduced from the first lens group, a first lens having a convex lens shape so as to have a positive power and configured to adjust power of the beam introduced through the aperture stop, and a second lens having a meniscus shape concavely curved toward the screen to reduce a size of the beam introduced from the first lens, the second lens group being configured to have a positive power; and a third lens group configured to calibrate a distortion of the beam introduced from the second lens group, using a non-spherical lens having a meniscus shape convexly curved toward the screen so as to have a negative power.
When an effective focusing distance of the first lens group is Fl and an effective focusing distance of the entire projection lens apparatus is F0, Fl/FO is set to be larger than 1.3 and smaller than 2.4.
When an effective focusing distance of the second lens group is F2, an effective focusing distance of the entire projection lens apparatus is F0, an effective focusing distance of the second lens is FL2, and an effective focusing distance of the first lens is FL1, F2/F0 is set to be larger than 1.5 and smaller than 2.2 and |FL2/FLl| is set to be larger than 1.
When an effective focusing distance of the third lens group is F3 and an effective focusing distance of the entire projection lens apparatus is F0, | F3/F0 | is larger than 1.5 and smaller than 2.1.
A positive power of the first lens is the largest of positive powers of all the lenses so that a power of a beam is adjusted.
According to the present invention, since the second lens of the second lens group has a meniscus shape concavely curved toward the screen to reduce a size of a beam and the second lens group has a positive power, a lens closest to the screen, i.e. the non-spherical lens of the third lens group can become smaller. Thus, a thickness of the entire projection system can be reduced.
Brief Description Of The Drawings
The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a view illustrating a conventional projection lens apparatus;
FIG. 2 is a view illustrating a feature of a second lens of FIG. 1;
FIG. 3 is a view illustrating a projection lens apparatus according to an embodiment of the present invention;
FIG. 4 is a view illustrating a projection lens apparatus according to another embodiment of the present invention; and
FIG. 5 is a view illustrating a feature of a second lens of the projection lens according to the embodiment of the present invention.
Detailed Description Of The Preferred Embodiments
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings . A detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
As illustrated in FIG. 3 to 5, a projection lens apparatus for enlarging an image of a pixelized panel PP to form the enlarged image on a screeen SC according to the present invention includes: a first lens group Gl including a telecentric lens 10 configured to telecentrically adjust a beam emitting from the panel PP, and an achromatic lens 20 configured to calibrate a chromatic aberration of the beam which has passed through the telecentric lens 10, the first lens group Gl being configured to have a positive power; a second lens group G2 including an aperture stop AS configured to adjust an amount of beams introduced from the first lens group Gl, a first lens 30 having a convex lens shape so as to have a positive power and configured to adjust power of the beam introduced through the aperture stop AS, and a second lens 40 having a meniscus shape concavely curved toward the screen SC to reduce a size of the beam introduced from the first lens 30, the second lens group G2 being configured to have a positive power; and a third lens group G3 configured to calibrate a distortion of the beam introduced from the second lens group G2, using a non-spherical lens 50 having a meniscus shape convexly curved toward the screen SC so as to have a negative power.
Here, when an effective focusing distance of the first lens group Gl is Fl and an effective focusing distance of the entire projection lens apparatus is F0, F1/F0 is set to be larger than 1.3 and smaller than 2.4.
When an effective focusing distance of the second lens group G2 is F2, an effective focusing distance of the entire projection lens apparatus is F0, an effective focusing distance of the second lens 40 is FL2, and an effective focusing distance of the first lens 30 is FL1, F2/F0 is set to be larger than 1.5 and smaller than 2.2 and |FL2/FLl| is set to be larger than 1.
When an effective focusing distance of the third lens group G3 is F3 and an effective focusing distance of the entire projection lens apparatus is F0, | F3/F0 | is larger than 1.5 and smaller than 2.1.
Meanwhile, a positive power of the first lens 30 is the largest of positive powers of all the lenses (the telecentric lens 10, the achromatic lens 20, the first lens 30, the second lens 40, and the non-spherical lens 50) so that a power of a beam is adjusted.
The first lens group Gl can be moved forward or rearward to adjust a focus of the entire projection lens apparatus .
In more detail, the telecentric lens 10 functions to telecentrically adjust a beam emitting from the panel PP using at least one lens. For example, as illustrated in FIG. 3, a beam emitting from the panel PP can be telecentrically adjusted using two lenses, or as illustrated in FIG. 4, a beam emitting from the panel PP can be telecentrically adjusted using one lens. Then, at least one of the lens or the lenses should be a positive power. Here, the telecentric adjustment of a beam refers to transmission of light almost perpendicular to the panel PP to the screen SC. Meanwhile, the telecentric lens 10 pertains to a well-known technology, and a detailed description thereof will be omitted.
The achromatic lens 20 is disposed parallel to the telecentric lens 10 such that a beam emitting from the telecentric lens 10 is introduced therethrough, and is a combined lens system configured to calibrate a chromatic aberration of a lens. That is, several lenses having different components are combined to offset chromatic aberrations of the lenses. For example, the achromatic lens 20 according to the present invention is a lens (usually, called a doublet) where two lenses are combined, may have a meniscus shape convexly curved toward the screen SC as in FIG. 3 or have a meniscus shape concavely curved toward the screen as in FIG. 4 according to a condition of the telecentric lens 10. Meanwhile, the first lens group Gl should have a positive power.
The aperture stop AS of the second lens group G2 is disposed furthest from the screen SC, and is disposed at a central portion of the entire projection lens apparatus in a suitable way.
The first lens 30 of the second lens group G2 is adapted to adjust a power of the entire projection system, and is a convex lens to have a positive power. Then, the first lens 30 is disposed between the aperture stop AS and the second lens 40.
The second lens 40 of the second lens group G2 has a meniscus shape concavely curved toward the screen SC, and is disposed closest to the screen SC of the second lens group G2. Here, a meniscus shape refers to a lens (i.e. a crescent-shaped lens) whose two lens surfaces have a same direction, in which case as in FIG. 5, light gathers (light is introduced through a convex surface) while an introduced beam is passing through the second lens 40 such that an exiting beam becomes smaller than the introduced beam. Accordingly, since the non-spherical lens 50 of the third lens group G3 through which a beam exiting from the second lens 40 is introduced may be manufactured to correspond to the reduced size of the beam, its diameter may be made smaller. Meanwhile, the second lens 40 may be a positive or negative power, but the second lens group G2 should have a positive power.
The non-spherical lens 50 of the third lens group G3 has a meniscus shape convexly curved toward the screen SC, and is disposed closest to the screen SC of all the elements of the projection lens apparatus. The third lens group G3 typically includes at least one non-spherical lens .
The projection lens apparatus according .to the present invention has an angle of view of 50 degrees or more.
Meanwhile, the prisms of FIGS. 1, 3, and 4 pertain to a well-known technology, and help share an illumination optical system and a pixelized panel PP.
According to the present invention, since the second lens of the second lens group has a meniscus shape concavely curved toward the screen to reduce a size of a beam and the second lens group has a positive power, a lens closest to the screen, i.e. the non-spherical lens of the third lens group can become smaller. Thus, a thickness of the entire projection system can be reduced.
Although a preferred embodiment of the present invention has been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

What Is Claimed Is :
1. A projection lens apparatus for enlarging an image of a pixelized panel to form the enlarged image on a screen, comprising:
a first lens group including a telecentric lens configured to telecentrically adjust a beam emitting from the panel, and an achromatic lens configured to calibrate a chromatic aberration of the beam which has passed through the telecentric lens, the first lens group being configured to have a positive power;
a second lens group including an aperture stop configured to adjust an amount of beams introduced from the first lens group, a first lens having a convex lens shape so as to have a positive power and configured to adjust power of the beam introduced through the aperture stop, and a second lens having a meniscus shape concavely curved toward the screen to reduce a size of the beam introduced from the first lens, the second lens group being configured to have a positive power; and
a third lens group configured to calibrate a distortion of the beam introduced from the second lens group, using a non-spherical lens having a meniscus shape convexly curved toward the screen so as to have a negative power .
2. The projection lens apparatus as claimed in claim 1, wherein when an effective focusing distance of the first lens group is Fl and an effective focusing distance of the entire projection lens apparatus is F0, Fl/FO is set to be larger than 1.3 and smaller than 2.4.
3. The projection lens apparatus as claimed in claim 1, wherein when an effective focusing distance of the second lens group is F2, an effective focusing distance of the entire projection lens apparatus is F0, an effective focusing distance of the second lens is FL2, and an effective focusing distance of the first lens is FLl, F2/F0 is set to be larger than 1.5 and smaller than 2.2 and |FL2/FLl| is set to be larger than 1.
4. The projection lens apparatus as claimed in claim 1, wherein when an effective focusing distance of the third lens group is F3 and an effective focusing distance of the entire projection lens apparatus is F0, | F3/F0 | is larger than 1.5 and smaller than 2.1.
5. The projection lens apparatus as claimed in claim 1, wherein a positive power of the first lens is the largest of positive powers of all the lenses so that a power of a beam is adjusted.
PCT/IB2012/000699 2011-03-24 2012-03-20 Projection lens apparatus WO2012127323A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2011-0026111 2011-03-24
KR1020110026111A KR101193518B1 (en) 2011-03-24 2011-03-24 Projection Lens

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Publication Number Publication Date
WO2012127323A2 true WO2012127323A2 (en) 2012-09-27
WO2012127323A3 WO2012127323A3 (en) 2013-01-17

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WO (1) WO2012127323A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104456430A (en) * 2014-12-22 2015-03-25 四川九洲视讯科技有限责任公司 Lens system for light path adjusting

Citations (4)

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Publication number Priority date Publication date Assignee Title
US5914818A (en) * 1996-11-29 1999-06-22 Texas Instruments Incorporated Offset projection lens for use with reflective spatial light modulators
JP2005164839A (en) * 2003-12-01 2005-06-23 Canon Inc Lens system and image projecting device having the same
JP2008158198A (en) * 2006-12-22 2008-07-10 Olympus Imaging Corp Image formation optical system and imaging apparatus using the same
JP2011053508A (en) * 2009-09-03 2011-03-17 Fujifilm Corp Projection type variable focus lens and projection type display device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6563650B2 (en) 2001-01-17 2003-05-13 3M Innovative Properties Company Compact, telecentric projection lenses for use with pixelized panels

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5914818A (en) * 1996-11-29 1999-06-22 Texas Instruments Incorporated Offset projection lens for use with reflective spatial light modulators
JP2005164839A (en) * 2003-12-01 2005-06-23 Canon Inc Lens system and image projecting device having the same
JP2008158198A (en) * 2006-12-22 2008-07-10 Olympus Imaging Corp Image formation optical system and imaging apparatus using the same
JP2011053508A (en) * 2009-09-03 2011-03-17 Fujifilm Corp Projection type variable focus lens and projection type display device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104456430A (en) * 2014-12-22 2015-03-25 四川九洲视讯科技有限责任公司 Lens system for light path adjusting
CN104456430B (en) * 2014-12-22 2017-07-07 四川九洲视讯科技有限责任公司 A kind of lens combination for light path adjustment

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KR20120109002A (en) 2012-10-08
KR101193518B1 (en) 2012-10-22
WO2012127323A3 (en) 2013-01-17

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