WO2006030817A1 - 偏光解消板及び電子光学機器 - Google Patents
偏光解消板及び電子光学機器 Download PDFInfo
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- WO2006030817A1 WO2006030817A1 PCT/JP2005/016917 JP2005016917W WO2006030817A1 WO 2006030817 A1 WO2006030817 A1 WO 2006030817A1 JP 2005016917 W JP2005016917 W JP 2005016917W WO 2006030817 A1 WO2006030817 A1 WO 2006030817A1
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- plate
- optical axis
- depolarizing
- optical
- angle
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- 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
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/46—Systems using spatial filters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
Definitions
- the present invention relates to a depolarizing plate that constitutes an optical low-pass filter together with a plurality of birefringent crystal plates, and an electro-optical device including the same.
- OLPF optical Low Pass Filter
- pseudo-color signals cannot be cut, for example, flickering of stripes due to moire generated when shooting striped patterns such as plaid clothes or fishnets, or the surface of the sea where sunlight reflects When the image is taken, so-called optical glare that occurs due to a specific polarization deviation reflected from the sea surface may occur, leading to a reduction in imaging quality.
- FIG. 11 is a schematic perspective view for explaining the configuration of a conventional OLPF.
- the OLPF50 shown in Fig. 11 is a birefringent crystal plate 51 that separates incident light into horizontal ordinary rays and extraordinary rays, a depolarization plate (1Z4 wavelength plate) 52 that converts linearly polarized light into circularly polarized light, and incident light in the vertical direction.
- the birefringent crystal plate 53 is separated and separated into ordinary and extraordinary rays.
- FIG. 12 is an explanatory diagram for explaining the function of the OLPF shown in FIG.
- incident light 61 incident on the birefringent crystal plate 51 is separated into an ordinary ray 62 and an extraordinary ray 63 by passing through the birefringent crystal plate 51 and incident on the depolarization plate 52. Is done.
- the ordinary ray 62 and the extraordinary ray 63 are linearly polarized, and when the ordinary ray 62 and the extraordinary ray 63 pass through the depolarization plate 52, the linearly polarized light is eliminated and the circularly polarized rays 64, 65 and become.
- the circularly polarized light 64 and 65 enter the birefringent crystal plate 53 and pass through the birefringent crystal plate 53, so that the circularly polarized light 64 becomes an ordinary ray 66 and an extraordinary ray 67, and a circularly polarized light 65 becomes an ordinary ray 68 and an extraordinary ray. Separated into 69 respectively.
- the emitted light emitted from the OLPF 50 shown in FIG. 11 can be separated into four light beams 66 to 69, so that the pseudo color signal that induces moire and the like is removed by the OLPF 50, and the incident light 4 Since it can be separated into two outgoing lights, it is possible to input a high-quality optical signal to a CCD or imaging tube.
- the OLPF configured as shown in FIG. 11 is disclosed in Patent Document 1, for example.
- Patent Document 2 discloses a technique for optimizing the intrinsic elliptical polarization rate of an OLPF depolarizing plate that passes a wavelength of, for example, 510 nm.
- Patent Document 1 Japanese Patent Laid-Open No. 2003-248198
- Patent Document 2 JP 2004-29653 A
- the cutting direction (usually Y-cut or X-cut) of the crystal forming the depolarizing plate is set to the Z direction, and the cutting angle is set to 20 degrees, and the plate surface horizontal line of the depolarizing plate And the optical axis projection line of the optical axis (hereinafter referred to as “optical axis direction”) is set to 45 ⁇ 2 °, and the intrinsic elliptical polarization rate of the depolarizing plate can be optimized at a wavelength of 510 nm. It has been.
- the inventor of the present application constructed a depolarization plate under the conditions disclosed in Patent Document 2 and measured the elliptical polarization rate.
- FIG. Fig. 13 (a) is a diagram showing the elliptic polarization characteristics of the depolarizing plate disclosed in Patent Document 2, and Fig. 13 (a) shows the crystal cutting direction of the depolarizing plate in the Z direction.
- Fig. 13 (b) shows the characteristics of elliptical polarization when the cutting angle is 20 ° and the optical axis orientation is 43 °.
- Fig. 13 (c) shows the elliptic polarization characteristics when the optical axis orientation is 20 ° and 45 °.
- the elliptical polarization rate indicates the light quantity ratio between the incident light and the outgoing light of the depolarizing plate. The closer the value is to 1, the more the linearly polarized light is canceled and the circularly polarized light becomes.
- the conventional depolarizing plate disclosed in Patent Document 2 has a design wavelength in the range of ⁇ 30 nm centered on 51 Onm, and functions as a 1Z4 wave plate (elliptic polarization rate of 0.8 or more). do not do. For this reason, when an OL PF using a depolarizing plate with high wavelength dependency as in Patent Document 2 is placed between the RGB color filter and the CCD, the OLPF function is wavelength dependent with respect to the RGB signal. Therefore, an appropriate signal is not supplied to each image element that detects RGB signals, and high color reproducibility cannot be obtained. In order to solve this problem, it is also possible to perform color correction when computing the signal obtained from the CCD. In this case, however, a complicated algorithm is required, and a large and expensive computation is required. Circuits were required, leading to the drawbacks of large equipment and high costs.
- the depolarizing plate 52 configured as in Patent Document 2 has, for example, an assembly of OLPF because the phase difference between the outgoing light of the ordinary light and the outgoing light of the extraordinary light depends on the incident direction and the incident angle. As a result, it was necessary to make the accuracy extremely high. As a result, the yield was poor.
- FIG. 14 is a diagram for explaining the incident angle dependence characteristics and the incident direction dependence characteristics of the conventional depolarizing plate disclosed in Patent Document 2, and FIG. 14 (a) shows the conventional depolarization characteristics.
- the incident angle dependence of the plate is shown.
- Figure 14 (b) shows the relationship between the main surface of the depolarizer and the incident direction.
- the incident angle shown in FIG. 14 (a) is indicated by the angle formed with the normal to the surface of the depolarizing plate.
- the depolarizing plate of Patent Document 2 has a larger phase difference as the incident angle increases, and the incident angle Z phase difference characteristic for each incident direction is also greatly different. It can be seen that the incident angle dependency characteristic and the incident direction dependency characteristic are poor.
- the present invention has been made in view of the above-described points, and an object thereof is to provide a depolarizing plate that can obtain an optimum intrinsic elliptical polarization rate. It is another object of the present invention to provide a depolarizing plate capable of expanding the wavelength band in which an appropriate elliptic polarization can be obtained. It is another object of the present invention to provide a depolarizing plate having good incident angle dependency characteristics and incident direction dependency characteristics.
- the invention described in claim 1 is a depolarizing plate that constitutes an OLPF together with a plurality of birefringent crystal plates, and the angle formed between the plate surface normal and the optical axis is 20 °.
- the angle between the horizontal surface of the plate and the optical projection line of the optical axis is set to 47.5 °.
- the invention according to claim 2 is a depolarization plate constituting an OLPF together with a plurality of birefringent crystal plates, wherein the angle formed by the plate surface normal and the optical axis is 27 °, and the plate surface horizontal line and the optical axis The angle formed by the optical projection line of the first wave plate set to 16.1 °, the angle formed by the plate normal and the optical axis is 13 °, and the angle formed by the plate horizontal line and the optical projection line of the optical axis And a second wave plate whose angle is set to 81 °.
- the invention according to claim 3 is a depolarization plate that constitutes an OLPF together with a plurality of birefringent crystal plates, wherein the angle formed by the plate surface normal and the optical axis is 20 °, and the plate surface horizontal line and the optical axis
- the first and second wave plates have an angle formed by the optical projection line of 47.5 °, and are bonded so that the optical axes of the first and second wave plates face each other. It is characterized by being configured.
- the invention according to claim 4 is the depolarization according to any one of claims 1 to 3.
- a board is provided.
- the angle formed by the plate surface normal of the depolarizing plate and the optical axis is 20 °, and the angle formed by the plate surface horizontal line and the optical projection line of the optical axis is 47.5 °.
- the elliptical polarization rate of the depolarizer can be set to an optimum value at a predetermined wavelength.
- the angle formed between the plate surface normal and the optical axis is set to 27 °, and the angle formed between the plate surface horizontal line and the optical projection line of the optical axis is set to 16.1 °.
- the angle formed by the plate surface normal and the optical axis is set to 20 °, and the angle formed between the plate surface horizontal line and the optical projection line of the optical axis is set to 47.5 °.
- a second wave plate, and the optical axes of these first and second wave plates are laminated so that they face each other.
- FIG. 1 is a schematic perspective view of an OLPF using a depolarizing plate according to a first embodiment of the present invention.
- the OLPF 1 shown in FIG. 1 is arranged on the front side of the CCD 10 and is configured to divide incident light into four parts and output the light to the CCD 10, for example.
- Such an OLPF1 has a first birefringent crystal plate 2 that separates incident light into horizontal ordinary rays and extraordinary rays, a depolarization plate (1Z4 wavelength plate) 3 that converts linearly polarized light into circularly polarized light, and an incident light.
- a second birefringent crystal plate 4 that separates light into normal and extraordinary rays in the vertical direction is bonded together.
- FIG. 2 is an explanatory diagram for explaining the functions of the OLPF shown in FIG.
- the incident light 11 incident on the first birefringent crystal plate 2 is separated into an ordinary ray 12 and an extraordinary ray 13 by passing through the first birefringent crystal plate 11 to be depolarized.
- the ordinary ray 12 and the extraordinary ray 13 incident on the depolarization plate 3 change their phases by 90 ° when passing through the depolarization plate 3, and the linear polarization of the ordinary ray 12 and the extraordinary ray 13 is eliminated.
- This circularly polarized light 14 and 15 is incident on the second birefringent crystal plate 4 and passes through the second birefringent crystal plate 4, so that the circularly polarized light 14 becomes ordinary light 16 and extraordinary ray 17, and the circularly polarized light 15 becomes Separated into ordinary ray 18 and extraordinary ray 19 respectively.
- the light beam finally emitted from OLPF1 shown in Fig. 2 is separated into four light beams.
- the OLPF 1 according to the first embodiment has the cutting direction of the crystal forming the depolarizing plate 3 in the Z direction, and the cutting angle is the normal to the plate surface of the depolarizing plate 3.
- the optical axis (Z-axis) 5 is set to 20 °
- the horizontal plane ( ⁇ - ⁇ ') of the depolarizing plate 3 and the optical projection line 6 of the optical axis 5 are
- the optical axis direction 0 is set to 47.5 °.
- the OLPF 1 is configured using the depolarization plate 3 according to the first embodiment, the pseudo color signal that induces moire and the like is further removed from the OLPF of Patent Document 2, and the incident light is reduced to 4. It becomes possible to separate into two outgoing lights.
- the elliptical polarization rate exceeding the specified value is the same as the conventional OLPF disclosed in Patent Document 2.
- Obtained wavelength band power Depolarization plate 3 that has a design wavelength of 510 nm and a range of only ⁇ 30 nm can function as a 1Z4 wavelength plate. It is said.
- the applicant of the present application has been able to expand the wavelength band in which an appropriate elliptical polarization rate can be obtained by configuring the OLPF depolarization plate as follows.
- a depolarizing plate capable of expanding the wavelength band where an appropriate elliptical polarization rate can be obtained will be described.
- Fig. 5 is a diagram showing the structure of the depolarizing plate that works according to the second embodiment.
- Fig. 5 (a) is a front view of the depolarizing plate as viewed from the incident side
- Fig. 5 (b) is the polarized light.
- FIG. 5 (c) is an exploded perspective view of the polarization canceling plate.
- FIG. 6 is a diagram showing dimensions of each part of the depolarizing plate according to the second embodiment. In this case, the depolarizing plate is Z-cut.
- the depolarizing plate 20 includes a first wave plate 21 and a second wave plate 22 as shown in FIG. 5 (b).
- the first wave plate 21 has a cutting direction of the crystal forming the wave plate in the Z direction, its cutting angle, that is, the first wave plate.
- the angle formed by the plate normal of 21 and the optical axis 31 is set to 27.0 °, and the horizontal line ( ⁇ - ⁇ ') of the first wave plate 21 and the optical projection line 33 of the optical axis 31 are set.
- the optical axis direction 0 which is the angle formed by is set to 16.1 °.
- the second wave plate 21 has a cutting direction of the quartz crystal forming the wave plate in the ⁇ direction and its cutting angle, that is, the second angle.
- the angle formed by the plate surface normal line of the wave plate 21 and the optical axis 32 is set to 13.0 ° and the plate surface of the second wave plate 22
- the optical axis direction ⁇ which is the angle formed between the horizontal line (C C ') and the optical projection line 34 of the optical axis 32, is set to 8
- the first wave plate 21 and the second wave plate 22 are overlapped so that the plate surface horizontal line ( ⁇ — ⁇ ′) and the plate surface horizontal line (C—C ′) are parallel to each other.
- the polarization plane orientations of the first and second wave plates 21 and 22 at this time are both 0 ° and the wavelength used is 550 nm. Also, the thickness of the first and second wave plates 21 and 22 and the first wave plate 21 force SO. 1465 mm, the second wave plate 22 force 0.33048 mm, and the thickness of the polarization canceling plate 20 becomes 0.44514mm.
- FIG. 7 is a diagram showing the elliptic polarization characteristics of the depolarizing plate according to the second embodiment. As shown in FIG. 7, the depolarizing plate 20 is connected to the first wave plate 21. By constituting with the second wave plate 22, it becomes possible to realize a 1Z4 wave plate having an elliptical polarization ratio of 0.8 or more in a wide band of 400 nm to 700 nm and a phase difference of approximately 90 °.
- FIG. 8 shows a simulation result of the elliptic polarization characteristic with respect to the wavelength when the optical axis direction of the first wave plate of the depolarizing plate according to the second embodiment is changed.
- Fig. 8 (a) shows the simulation results when the optical axis direction of the first wave plate is set to 16.1 °
- Fig. 8 (b) shows the optical axis direction of the first wave plate set to 17 °
- FIG. 8 (c) shows the simulation results when the optical axis direction of the first wave plate is set to 15 °, respectively.
- the optical axis direction of the first wave plate 21 is preferably set to 16 °. Also, comparing Fig. 8 (a) and Fig. 8 (c), when the optical axis direction is set to 15 ° as shown in Fig. 8 (c), the elliptical polarization rate is higher than that in Fig. 8 (a). It can be seen that it has declined significantly. Therefore, it can be seen that it is preferable to configure the first and second wave plates 21 and 22 of the depolarization plate 20 as shown in FIGS.
- Fig. 9 shows the structure of the depolarizer according to the third embodiment.
- Fig. 9 (a) is a front view of the depolarizer from the incident side
- Fig. 9 (b) is the diagram of the depolarizer.
- a side view and FIG. 9 (c) are exploded perspective views of the depolarizer.
- the depolarizing plate 3 includes a first wave plate 11 and a first wave plate 11 as shown in FIG.
- the second wave plate 12 is bonded together.
- the first wave plate 11 is a 1Z8 wave plate.
- the cutting direction of the crystal forming the wave plate is the Z direction (optical axis direction), and the cutting angle is the wave plate 11
- 8 formed by the principal plane normal to the optical axis (Z-axis) 13 is set to 110 °.
- the optical axis direction ⁇ force 7.5 which is the angle formed by the first wave plate 11 plate surface horizontal line A—A ′ (optical projection line of the optical axis of the birefringent crystal plate) and the optical projection line 15 of the optical axis 13 7.5 Set to °.
- the second wave plate 12 is a 1Z8 wave plate, and the cutting direction of the crystal forming the wave plate is the Z direction, and the cutting angle is the main wave plate 12 as shown in FIG.
- the angle between the surface normal and the optical axis 14 is set to
- the optical axis direction 0 force is 5 °, which is the angle formed by the line B—B ′ (the optical projection line of the optical axis of the birefringent crystal plate) and the optical projection line 16 of the optical axis 14.
- the depolarizing plate 3 of the present embodiment has the optical axis 13 of the first wave plate 11 and the second wave plate 12 when the two wave plates 11 and 12 configured as described above are bonded together.
- the optical axis 14 and the direction of facing each other were pasted together.
- FIG. 10 is a diagram for explaining the incident angle dependence characteristics of the depolarizing plate according to the third embodiment.
- FIG. 10 (a) shows the incident direction of the depolarizing plate according to the present embodiment. Incident angle dependence characteristics are shown for 0 °, 22.5 °, 45.0 °, 67.5 °, 90.0 °, 112.5 °, 135.0 °, and 157.5 °. Yes.
- Figure 10 (b) shows the relationship between the main surface of the depolarizer and the incident direction. Although not shown in the figure, the incident angle shown in FIG. 10 (a) is indicated by the angle formed with the surface normal of the depolarizer.
- the depolarizing plate 3 of the present embodiment has no phase difference in the incident angle range of ⁇ 5 ° with respect to the incident light from any incident direction. Therefore, it can be seen that the depolarization plate 3 of this embodiment has improved incident angle dependency characteristics and incident direction dependency characteristics as compared with the conventional depolarization plate shown in FIG.
- FIG. 1 is a schematic perspective view of an OLPF using a depolarizing plate that works according to the first embodiment of the present invention.
- FIG. 2 is a diagram for explaining the functions of OLPF according to the first embodiment.
- FIG. 3 is an explanatory view illustrating the structure of a depolarizing plate according to the first embodiment.
- FIG. 4 is a diagram showing elliptic polarization characteristics of the depolarizer according to the first embodiment.
- FIG. 5 is an explanatory diagram for explaining the structure of a depolarizing plate according to a second embodiment.
- FIG. 6 is a diagram showing dimensions of each part of the depolarizing plate shown in FIG.
- FIG. 7 is a diagram showing elliptic polarization characteristics of a depolarizing plate according to a second embodiment.
- FIG. 8 is a diagram showing a simulation result of elliptic polarization characteristics with respect to wavelength when the optical axis direction of the first wavelength plate of the depolarizing plate according to the second embodiment is changed.
- FIG. 9 is an explanatory diagram of the structure of a depolarizing plate according to a third embodiment.
- FIG. 10 is a graph showing input angle dependence characteristics of a depolarizer according to a third embodiment.
- FIG. 11 is a schematic perspective view of a conventional OLPF.
- FIG. 12 A diagram for explaining the functions of a conventional OLPF.
- FIG. 13 is a diagram showing the elliptic polarization characteristics of a depolarizing plate used in a conventional OLPF.
- FIG. 14 is a graph showing the input angle dependence characteristics of a conventional OLPF.
- Optical low pass filter 2 First birefringent crystal plate, 3, 20 Depolarization plate, 4 Second birefringent crystal plate, 5, 31, 32 Optical axis, 6, 33, 34 Optical axis projection line , 21 1st wave plate, 22 2nd wave plate
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Abstract
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Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2004-268929 | 2004-09-15 | ||
JP2004268929A JP2006084733A (ja) | 2004-09-15 | 2004-09-15 | 偏光解消板及び電子光学機器 |
JP2004-299410 | 2004-10-13 | ||
JP2004299410A JP2006113218A (ja) | 2004-10-13 | 2004-10-13 | 偏光解消板及び電子光学機器 |
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WO2006030817A1 true WO2006030817A1 (ja) | 2006-03-23 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109387950A (zh) * | 2017-08-10 | 2019-02-26 | 佳能株式会社 | 光学低通滤波器和成像装置 |
RU222876U1 (ru) * | 2023-11-07 | 2024-01-22 | федеральное государственное автономное образовательное учреждение высшего образования "Московский физико-технический институт (национальный исследовательский университет)" | Устройство для преобразования поляризации света |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03276123A (ja) * | 1990-03-27 | 1991-12-06 | Ricoh Co Ltd | 液晶表示素子 |
JP2004029653A (ja) * | 2002-06-28 | 2004-01-29 | Kinseki Ltd | 光学ローパスフィルター及び偏光解消板 |
-
2005
- 2005-09-14 WO PCT/JP2005/016917 patent/WO2006030817A1/ja active Application Filing
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03276123A (ja) * | 1990-03-27 | 1991-12-06 | Ricoh Co Ltd | 液晶表示素子 |
JP2004029653A (ja) * | 2002-06-28 | 2004-01-29 | Kinseki Ltd | 光学ローパスフィルター及び偏光解消板 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109387950A (zh) * | 2017-08-10 | 2019-02-26 | 佳能株式会社 | 光学低通滤波器和成像装置 |
CN109387950B (zh) * | 2017-08-10 | 2021-08-06 | 佳能株式会社 | 光学低通滤波器和成像装置 |
RU222876U1 (ru) * | 2023-11-07 | 2024-01-22 | федеральное государственное автономное образовательное учреждение высшего образования "Московский физико-технический институт (национальный исследовательский университет)" | Устройство для преобразования поляризации света |
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