WO2014174600A1 - 投写型映像表示装置 - Google Patents
投写型映像表示装置 Download PDFInfo
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- WO2014174600A1 WO2014174600A1 PCT/JP2013/061967 JP2013061967W WO2014174600A1 WO 2014174600 A1 WO2014174600 A1 WO 2014174600A1 JP 2013061967 W JP2013061967 W JP 2013061967W WO 2014174600 A1 WO2014174600 A1 WO 2014174600A1
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- lens
- projection
- refractive power
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- biconvex
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0852—Catadioptric systems having a field corrector only
-
- 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
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
-
- 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
- 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
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
-
- 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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- 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
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
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- 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
- G03B9/00—Exposure-making shutters; Diaphragms
- G03B9/64—Mechanism for delaying opening of shutter
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/317—Convergence or focusing systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/3173—Constructional details thereof wherein the projection device is specially adapted for enhanced portability
Definitions
- the present invention relates to a projection display apparatus.
- Patent Document 1 a projection optical system using two free-form surface lenses that are free-form surface optical elements and one free-form surface mirror is known (see Patent Document 1).
- Patent Document 1 a large back focus (hereinafter referred to as “BFL”) is secured in order to arrange the color synthesis prism (filter thickness: 25.642 mm), and the lens length of the coaxial lens group (from the entrance surface of the lens 1).
- the distance from the lens 14 exit surface) is 91.1mm
- the distance from the image display element to the free-form curved mirror is 200.6mm
- the distance from the free-form curved mirror to the image plane is 500mm.
- an object of the present invention is to provide a projection display apparatus that further shortens the projection distance (widens) and reduces the size of the projection optical system.
- the present invention it is possible to provide a projection display apparatus that further shortens the projection distance (widens) and reduces the size of the projection optical system.
- FIG. 1 is a configuration diagram of a projection optical system according to Embodiment 1.
- FIG. FIG. 3 is a ray diagram of the projection optical system of Example 1.
- Lens data of Example 1. The free-form surface coefficient of Example 1.
- the aspheric coefficient of Example 1. The odd-order polynomial aspherical coefficient of Example 1.
- FIG. 3 is an explanatory diagram of the shape of the lens 1. Explanatory drawing of flange back adjustment. Explanatory drawing of the minimum inclination light beam and the maximum inclination light beam.
- FIG. 3 is a distortion aberration diagram of Example 1.
- FIG. 4 is a lateral aberration diagram of Example 1.
- FIG. 3 is a spot diagram of the first embodiment.
- FIG. 6 is a configuration diagram of a projection optical system of Example 2.
- FIG. 6 is a ray diagram of the projection optical system of Example 2.
- Lens data of Example 2 The free-form surface coefficient of Example 2.
- Aspherical coefficients of Example 2. The odd-order polynomial aspherical coefficient of Example 2.
- FIG. 6 is a distortion aberration diagram of Example 2.
- FIG. 4 is a lateral aberration diagram of Example 2.
- FIG. 9 is a spot diagram of Example 2. Explanatory drawing of BFL securing by retro focus. Ray diagram of optical design for wide angle.
- FIG. 24 is an explanatory diagram of securing BFL by retrofocus.
- the projection optical system in FIG. 24 includes a lens L 101 having a positive refractive power and a lens L 102 having a negative refractive power from the image display element 5 side. Assuming that the light beam is incident from the lens L 102 side, the light beam jumps up with the negative refractive power of the lens L 102 and bends with the positive refractive power of the lens L 101 . Lens L 102 min with splashed rays in, has secured about 2 times more BFL focal length f.
- the angle of view is set to a half angle of view of 30 degrees, and the lens L 101 and the lens L 102 are aspherical.
- the projection optical system of Patent Document 1 projection image of 80 inches at a projection distance of 500 mm
- the projection distance is further shortened, but the possibility of interference between the projection image and the projection display apparatus increases.
- the jumping up of the light beam to realize a wide angle of the projection optical system not only increases the distance between the lens L 101 and the lens L 102 (enlarges) but also increases the refractive power of the lens L 101 and the lens L 102. It can also be increased.
- the lens balls are usually divided (increasing the number of lenses).
- the lens length becomes long even if the distance between the convex lens balls on the optical axis, the edge thickness of the convex lens ball, the center thickness of the concave lens ball, and the interference of the edge of the concave lens ball are limited.
- the manufacturing cost increases due to the increase in the number of lenses.
- FIG. 1 is a configuration diagram of the projection optical system 1.
- an image display element 5 a conversion filter 6, a coaxial lens group 2 having a refractive action and including a plurality of lenses, a free-form surface lens group 3, and a free-form surface mirror 4 are arranged in the light traveling direction.
- the conversion filter 6 is expressed as including a dustproof glass, a polarizing plate, a color composition prism, and the like of the video display element 5.
- the refractive power of the free-form surface lens is such that the principal ray on the side farther from the optical axis is shorter than the passage distance of the principal ray on the side close to the optical axis of the lens group 2 through the relevant free-form surface lens. Is negative when the principal ray on the side closer to the optical axis of the lens group 2 has a larger passing distance of the principal ray farther from the optical axis than the passing distance through which the free-form surface lens passes. Is defined as the refractive power of. In the case of the same light beam as the lens optical axis, the passing distance is equal to the center thickness of the lens.
- the image light emitted from the image display element 5 passes through the conversion filter 6, is refracted by the coaxial lens group 2 and the free-form surface lens group 3, is reflected by the free-form surface mirror 4, and the image surface 8 (screen). Is projected onto the screen.
- the lens group 2 is a retrofocus type including a first lens group G 1 having a positive refractive power and a second lens group G 2 having a negative refractive power.
- the aperture stop 7 is disposed between the first lens group G 1 and the second lens group G 2.
- the image display element side is referred to as a reduction side
- the light traveling direction (image plane side) is referred to as an enlargement side.
- the first lens group G 1 includes a lens L 1, the refractive index of the aspherical lens L 2 made 1.8 or more plastics having a small radius of curvature on the reduction side has a positive refractive power made of glass, Abbe number A lens L 3 having a positive refractive power and a biconvex shape made of glass of 70 or more, a lens L 4 having a negative refractive power and a negative refractive power made of a glass having an Abbe number of 25 or less, and an Abbe number of 70 or more And a biconvex lens L 5 having a positive refractive power and having a positive refractive power, and a biconvex lens L 6 having a positive refractive power and having a small radius of curvature toward the enlargement side.
- the Lens L 5 from the lens L 3 constitutes a triplet lens lamination.
- the second lens group G 2 is aspherical lens L 7 having a meniscus shape with a convex surface on the reduction side has a negative refractive power with a plastic, the Abbe number has a negative refractive power made of 70 or more glass
- a biconcave lens L 8 having a concave surface facing the reduction side, a biconvex lens L 9 made of glass having an Abbe number of 35 or less, a positive refractive power and a small curvature radius on the enlargement side, and plastic in composed of aspherical lens L 10 of a meniscus shape with a convex surface on the enlargement side has a negative refractive power.
- the free-form surface lens group 3 includes a plastic free-form lens L 11 having a convex surface facing the enlargement side and a free-form lens L 12 having a meniscus lens shape having a convex surface facing the enlargement side made of plastic. Is done.
- FIG. 3 shows the lens data of Example 1.
- the radius of curvature is represented by a positive sign when the center position of the radius of curvature is in the traveling direction, and the inter-surface distance represents the distance on the optical axis from the vertex position of each surface to the vertex position of the next surface.
- Eccentricity is a value in the Y-axis direction
- tilting is rotation about the X-axis in the YZ plane
- eccentricity / falling acts in the order of eccentricity and tilting on the corresponding surface.
- the next surface is placed at the position of the inter-surface distance on the new coordinate system on which.
- DAR means decenter and return. Eccentricity and tilting act only on that surface and do not affect the next surface.
- the glass name PMMA is a plastic acrylic.
- FIG. 4 shows the free-form surface coefficient defined by Equation 1.
- the free-form surface coefficient is a rotationally asymmetric shape with respect to each optical axis 9 (Z-axis), and is a shape defined by a conical term component and a XY polynomial term component.
- X second order
- Y third order
- the position of each optical axis of the free-form surface is determined by the amount of decentering / falling in the lens data of FIG.
- Fig. 5 shows the aspheric coefficients defined by Equation 2.
- the aspheric coefficient has a rotationally symmetric shape with respect to each optical axis (Z-axis), and uses a component of a conic term and an even-order component of 4th to 20th order of the height h from the optical axis. Yes.
- the odd-order polynomial aspheric coefficient shown in FIG. 6 is a shape obtained by adding an odd-order component to the aspheric surface in FIG. Since the height h is a positive value, it has a rotationally symmetric shape.
- FIG. 7A shows an example using L 201 instead of L 1 for comparison
- FIG. 7B shows an example using L 1 .
- the image light emitted from the image display element 5 is refracted by a lens L 201 arranged at a distance of BFL.
- the main plane of the biconvex lens (indicated by a dotted line) is located inside the biconvex lens.
- the main plane of the L 1 is a plano-convex lens is located at the convex portion of the plano-convex lens. That is, the direction of the plano-convex lens, while ensuring a sufficient BFL, in the difference of the position of the main plane than the biconvex lens, it is possible refracted image light early, ray height on subsequent lens L 2 and subsequent This is advantageous in reducing the size of the projection optical system 1.
- the refractive index in the lens L 1 is applied 1.8 or more glass, in Example 1 FDS90 the (HOYA).
- Axial chromatic aberration ⁇ (Hm i 2 ⁇ i / ⁇ i)
- Chromatic aberration of magnification ⁇ (Hm i Hp i ⁇ i / ⁇ i)
- Refractive power ⁇ (Hm i ⁇ i )
- the lens L 3 and the Abbe number to the convex lens in the lens L 4 and the lens L 5 is more than 70 glass, in terms of the Abbe number to the concave lens has applied the 25 following glass, further, generated in the lens L 1 for chromatic aberration is also corrected and increased refractive power of each lens ball lens L 3 and the lens L 4 and the lens L 5.
- Results gave a large refractive power, since the size aberration occurs in each lens ball, by making the lens L 3 and the lens L 4 and the lens L 5 a cemented triplet lens, while performing correction of chromatic aberration, Occurrence of aberrations is prevented.
- the lens L 2 is a plastic aspheric lens, and the refractive power of the lens L 2 is reduced in order to reduce the change in the refractive power of the plastic lens due to the temperature change, that is, ⁇ 2 ⁇ 0. Therefore, there is little influence on chromatic aberration.
- FIG. 8 is an explanatory diagram of flange back adjustment.
- the image display element 5 and the image plane 8 for the projection optical system constituted by the convex lens L 301 (corresponding to L 1 to L 5 in FIG. 1) and the convex lens L 302 (corresponding to L 6 in FIG. 1) are used.
- Screen should be in a conjugate relationship, but if there is a positional deviation of the image display element 5 or lens ball in the assembly process, or a curvature radius error of the lens ball, the conjugate relationship between the image display element 5 and the image plane 8 is It will shift.
- FIG. 8 it is possible to focus by moving the convex lens L 301 on the optical axis.
- the axial ray between the convex lens L 301 and the convex lens L 302 is a substantially parallel ray 100, the flange back adjustment is performed without changing the focal length of the projection optical system 1 even if the convex lens L 301 is moved. It can be performed.
- the flange back adjustment can also be performed by moving the free-form surface lens group 3 that is a focusing lens, but (1) the original moving range (adjustment range) of the focusing lens is shifted.
- the component error of the coaxial lens group 2 is preferably corrected by the same lens group 2 for optical performance, so that the first lens group G 1 having the positive refractive power of the lens group 2 is selected. Separate into two refractive power components. Specifically, a lens L 5 from the lens L 1 in FIG. 1, is separated by the lens L 6, a lens L 5 from the lens L 1 by moving on the optical axis, it was flange back adjustment.
- the Abbe number is 70 or more in the lens L 5 , but conversely the Abbe number is 35 or less in the lens L 6 .
- FIG. 9 shows the minimum tilted light flux, the maximum tilted light flux, the axial ray equivalent height, and the principal ray equivalent height.
- M 2 ⁇ M 1 using the pupil center light P 1 , upper limit light P 2, and lower limit light P 3 with the maximum tilted light beam P (light beam with an angle of view 4 in FIG. 2) having the maximum incident angle.
- the lens L 7 has a small principal ray height of 1.65 mm for the incident surface and 2.15 mm for the exit surface, and the lens L 7 is mainly excellent in correcting spherical aberration.
- the lens L 2 is the chief ray height has a large value in the negative and the incident surface -4.43Mm ⁇ exit surface -3.76Mm, mainly, excellent correction effects of aberration in the periphery of such distortion.
- the lens L 10 has a large principal ray equivalent height, it has positive values such as an incident surface of 5.73 mm and an exit surface of 7.40 mm, and the combination with the aspherical correction function of the lens 2 is effective. Is.
- a focal length -7137.9mm plastic lens L 2 is the absolute value 3000 It can be seen that the focal length of the lens L 7 is ⁇ 105.0 mm is as large as about 50 times in absolute value, and the refractive power is sufficiently small.
- the lens L 7 is a plastic lens having a small refractive power
- the lens L 8 is a glass lens having a large refractive power. Since it is possible to increase the lens length, it is advantageous for widening the angle.
- Focal length -33.3mm of the lens L 10 of plastic as high as about 16 times, but a large power compared to the lens L 2 and the lens L 7.
- This axial ray height equivalent of a lens L 10 shown in FIG. 25 is as small as about 70% of the axial ray height equivalent of a lens L 2 ⁇ lens L 7, on-axis to on-axis chromatic aberration because light corresponding height acting square, because the influence of the refractive power of the lens L 10 is small.
- Lens group 2 is the focal length of the first lens group G 1 is 21.2 mm
- the focal length of the second lens group G 2 is the configuration of the retrofocus called -50.0Mm
- Lens L 3 and the lens L 4 and the combined triplet lens attaching the lens L 5 is the focal length of each lens ball is small focal length and 14.5mm and -5.6mm and 12.2 mm, a large refractive power, respectively
- the focal length of the entire triplet lens is ⁇ 235.6 mm and the refractive power is negative. That is, the absolute value of f 1 / f L3L4L5 , which is the ratio of the focal length f L3L4L5 of the entire triplet lens and the focal length f 1 of the entire lens group 2, was 0.2 or less.
- FIG. 8 shows distortion performance
- FIG. 9 shows a lateral aberration diagram
- FIG. 10 shows a spot diagram. It can be seen that good optical performance is achieved.
- FIG. 14 is a configuration diagram of the projection optical system according to the second embodiment
- FIG. 15 is a ray diagram of the second embodiment.
- FIG. 16 shows lens data of Example 2 (PMMA of glass name is plastic acrylic, ZEONEX_K26R is a plastic material manufactured by Zeon),
- FIG. 17 is a free-form surface coefficient of Example 2
- FIG. 19 is an odd-order polynomial aspherical coefficient of Example 2
- FIG. 21 is a distortion performance of Example 2
- FIG. 23 is a spot diagram of Example 2. It can be seen that good optical performance is achieved.
- the projection distance can be further reduced (wide angle) and the projection optical system can be reduced with the minimum number of lenses.
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Abstract
Description
軸上色収差=Σ(Hmi 2φi/νi)
倍率色収差=Σ(HmiHpiφi/νi)
屈折力=Σ(Hmiφi)
Claims (5)
- 映像表示素子に対して光の進行方向に配置され、複数のレンズを含むレンズ群と、
前記レンズ群に対して光の進行方向に配置される第1の自由曲面レンズと、
前記第1の自由曲面レンズに対して光の進行方向に配置される第2の自由曲面レンズと、
前記第2の自由曲面レンズから出射する光を反射してスクリーン上に傾斜して投写する自由曲面ミラーを備え、前記レンズ群は、前記映像表示素子側から順に、
正の屈折力を有し前記映像表示素子側に小さい曲率半径を向けた両凸形状の第1レンズと、
非球面形状の第2レンズと、
正の屈折力を有し両凸形状の第3レンズと、
負の屈折力を有し両凹形状の第4レンズと、
正の屈折力を有し両凸形状の第5レンズと、
正の屈折力を有し拡大側に小さい曲率半径を向けた両凸形状の第6レンズと、
負の屈折力を有し縮小側に凸面を向けたメニスカス形状、かつ、非球面形状の第7レンズと、
負の屈折力を有し両凹形状の第8レンズと、
正の屈折力を有し拡大側に小さい曲率半径を向けた両凸形状の第9レンズと、
負の屈折力を有し拡大側に凸面を向けたメニスカス形状、かつ、非球面形状の第10レンズを備え、
前記第3、第4、及び第5レンズは、それぞれが貼り合わされたトリプレットレンズを構成し、
前記第1及び第2の自由曲面レンズは、拡大側に凸面を向けたメニスカスレンズ形状である、投写型映像表示装置。 - 前記第1レンズの屈折率は1.8より大きい、請求項1記載の投写型映像表示装置。
- 前記第3レンズのアッベ数は70より大きく、
前記第4レンズのアッベ数は25より小さく、
前記第5レンズのアッベ数は70より大きく、
前記トリプレットレンズ全体の焦点距離fL3L4L5と、前記レンズ群全体の焦点距離f1の比、f1/fL3L4L5の絶対値が0.2以下である、請求項1又は2記載の投写型映像表示装置。 - 前記第6レンズのアッベ数は35より小さい、請求項1乃至3何れか一に記載の投写型映像表示装置。
- 前記投写光学系の投写距離Aと、投写像の長辺の長さW8とで定義する投写比(A/W8)に、前記レンズ群の長さBを、前記映像表示素子の画像有効範囲の長辺の長さW5で規格化した値(B/W5)を掛けた値(A/W8)×(B/W5)は1.5以下である、請求項1乃至4何れか一に記載の投写型映像表示装置。
Priority Applications (4)
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PCT/JP2013/061967 WO2014174600A1 (ja) | 2013-04-24 | 2013-04-24 | 投写型映像表示装置 |
US14/786,944 US9581795B2 (en) | 2013-04-24 | 2013-04-24 | Projection-type video display device |
CN201380075946.8A CN105190395B (zh) | 2013-04-24 | 2013-04-24 | 投影型影像显示装置 |
JP2015513406A JP6035416B2 (ja) | 2013-04-24 | 2013-04-24 | 投写型映像表示装置 |
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PCT/JP2013/061967 WO2014174600A1 (ja) | 2013-04-24 | 2013-04-24 | 投写型映像表示装置 |
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JP2017009779A (ja) * | 2015-06-22 | 2017-01-12 | セイコーエプソン株式会社 | 投写光学系及びプロジェクター |
JP2017049490A (ja) * | 2015-09-03 | 2017-03-09 | 株式会社リコー | 投射光学系、投射装置及び屈折光学系ユニット |
JP2019039991A (ja) * | 2017-08-23 | 2019-03-14 | キヤノン株式会社 | 光学系およびそれを有する撮像装置 |
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US9581795B2 (en) | 2017-02-28 |
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JPWO2014174600A1 (ja) | 2017-02-23 |
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