Optical member and imaging device

Abstract

The present invention provides an optical member provided with a plurality of opening regions, and an imaging device. This optical member is provided with a plurality of opening regions including a first opening region and a second opening region which each transmit a light ray of an optical system, the first opening region and the second opening region being adjacent to each other. The optical member comprises: a plurality of optical filters (144B, 144C) that are disposed in the first opening region and the second opening region, and transmit light having wavelength bands at least partially different from each other; a plurality of polarizing filters (148B, 148C) that are disposed in the first opening region and the second opening region, and have polarization directions different from each other; and a light ray incidence reduction part (W) that reduces the incidence of a light ray (U) incident on the first opening region on the optical filter (144C) and / or polarizing filter (148C) disposed in the second opening region.

Description

[Technical field]

[0001] The present invention relates to an optical member and an imaging device, and more particularly to an optical member and an imaging device having a plurality of aperture regions. [Background technology]

[0002] 2. Description of the Related Art There is known a technique for simultaneously acquiring a plurality of images having different image information from one another by performing imaging once.

[0003] Patent Document 1 describes an imaging device that includes a front optical system that transmits light from an object, a spectral filter array that transmits the light from the front optical system through a plurality of spectral filters, a small lens array that transmits the light from the plurality of spectral filters through a plurality of small lenses to form a plurality of object images, an imaging element that captures each of the plurality of object images, and an image processing unit that determines two-dimensional spectral information of the object image based on an image signal output from the imaging element. In the imaging device described in Patent Document 1, a partition member is disposed between the small lens array and the imaging element. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2013 / 179620 Summary of the Invention

[0005] One embodiment of the technique disclosed herein provides an optical member and an imaging device that include a plurality of aperture regions. [Means for solving the problem]

[0006] An optical element according to one embodiment of the present invention comprises a plurality of aperture regions including a first aperture region and a second aperture region that transmit light rays of an optical system, the first aperture region and the second aperture region being adjacent to each other, and comprises a plurality of optical filters arranged in the first aperture region and the second aperture region that transmit light having at least some different wavelength bands, a plurality of polarizing filters arranged in the first aperture region and the second aperture region and having mutually different polarization directions, and a light incidence reduction section that reduces the incidence of light rays incident on the first aperture region into at least one of the optical filters and the polarizing filters arranged in the second aperture region.

[0007] Preferably, the light incidence reduction portion is provided at a boundary between the first opening region and the second opening region and extends along the optical axis direction of the optical system.

[0008] Preferably, the light incidence reducing portion reflects light.

[0009] Preferably, the light incidence reducing portion guides the reflected light to the object side of the optical system.

[0010] Preferably, the light incidence reduction section is composed of a first shading section extending along the optical axis direction of the optical system and provided at the boundary between the first opening area and the second opening area, and a second shading section extending from the boundary in a direction along a plane perpendicular to the optical axis.

[0011] Preferably, the first light blocking portion is provided with an inclination that reduces the reflection angle of the reflected light.

[0012] Preferably, the light incidence reduction portion is provided extending from the boundary between the first opening region and the second opening region in a direction along a plane perpendicular to the optical axis of the optical system.

[0013] Preferably, the light incidence reduction section is provided on the object side surface of the optical filter or the polarizing filter.

[0014] Preferably, the light incidence reduction portion is provided on the image side surface of the optical filter or the polarizing filter.

[0015] Preferably, the optical filter and the polarizing filter are disposed in close proximity to each other.

[0016] Preferably, the above-mentioned optical element is provided so that the optical filter and the polarizing filter are separate, and the light incidence reduction section is provided between the optical filter and the polarizing filter, extending in a plane perpendicular to the optical axis of the optical system and / or in a direction along the optical axis.

[0017] Preferably, the optical filter has, in the first opening region, a first surface that transmits a first wavelength band to the object side of the optical system and a second surface that transmits a second wavelength band to the image side of the optical system, and in the second opening region, a third surface that transmits a third wavelength band to the object side of the optical system and a fourth surface that transmits a fourth wavelength band to the image side of the optical system, and the light incidence reduction portion is disposed on the fourth surface when the overlap between the first wavelength band and the fourth wavelength band is equal to or greater than a predetermined wavelength band A.

[0018] Another aspect of the present invention is an imaging device that includes a lens device in which the above-mentioned optical element is arranged at or near the pupil position, a plurality of polarizers having polarization directions corresponding to the polarization directions of the plurality of polarizing filters, an imaging element including a plurality of pixel groups that selectively receive light that has passed through any of a plurality of aperture areas, and a processor that generates a plurality of images that respectively correspond to the wavelength bands of the plurality of optical filters based on a plurality of image signals output from the imaging element. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of an imaging device. [Diagram 2] FIG. 2 is a diagram illustrating a configuration of the signal processing unit. [Diagram 3] FIG. 3 is a diagram showing a schematic configuration of an imaging element. [Figure 4] FIG. 4 is a cross-sectional view showing a schematic configuration of one pixel shown in FIG. [Diagram 5] FIG. 5 is a perspective view of the appearance of the lens device. [Figure 6]FIG. 6 is a cross-sectional view of the lens device taken along the optical axis L. [Figure 7] FIG. 7 is an external view of the frame. [Figure 8] FIG. 8 is a diagram illustrating an example of the configuration of an optical member. [Figure 9] FIG. 9 is a diagram for explaining the configuration of a filter set. [Figure 10] FIG. 10 is a diagram showing the relationship between the aperture area and the filter configuration. [Figure 11] FIG. 11 is a diagram for explaining a case where crosstalk occurs. [Figure 12] FIG. 12 is a diagram illustrating the light incidence reduction portion W according to the first embodiment. [Figure 13] FIG. 13 is a diagram illustrating another example of the first embodiment. [Figure 14] FIG. 14 is a conceptual diagram showing the frame. [Figure 15] FIG. 15 is a diagram illustrating another example of the first embodiment. [Figure 16] FIG. 16 is a diagram illustrating a light incidence reduction portion according to the second embodiment. [Figure 17] FIG. 17 is a diagram illustrating another example of the second embodiment. [Figure 18] FIG. 18 is a diagram illustrating another example of the second embodiment. [Figure 19] FIG. 19 is a diagram illustrating a light incidence reduction portion W according to the third embodiment. [Figure 20] FIG. 20 is a diagram illustrating another example of the third embodiment. [Figure 21] FIG. 21 is a diagram illustrating another example of the third embodiment. [Figure 22] FIG. 22 is a diagram for explaining the return angle of the return portion. [Diagram 23] FIG. 23 is a diagram illustrating the light incidence reduction portion W of the fourth embodiment. [Figure 24] FIG. 24 is a diagram illustrating another example of the fourth embodiment. [Diagram 25]FIG. 25 is a diagram illustrating another example of the fourth embodiment. [Figure 26] FIG. 26 is a diagram illustrating another example of the fourth embodiment. [Figure 27] FIG. 27 is a diagram illustrating the correlation between the height of the area boundary member and the height of the second light-shielding portion. [Figure 28] FIG. 28 is a diagram illustrating the light incidence reduction portion W of the fifth embodiment. [Figure 29] FIG. 29 is a diagram illustrating another example of the fifth embodiment. [Diagram 30] FIG. 30 is a diagram illustrating another example of the fifth embodiment. [Diagram 31] FIG. 31 is a diagram illustrating the light incidence reduction portion W of the sixth embodiment. [Diagram 32] FIG. 32 is a diagram illustrating another example of the sixth embodiment. [Diagram 33] FIG. 33 is a diagram for explaining a reference example of the sixth embodiment. [Diagram 34] FIG. 34 is a diagram for explaining a reference example of the sixth embodiment. [Diagram 35] FIG. 35 is a diagram for explaining a method for calculating the height of an area boundary member according to the sixth embodiment. [Diagram 36] FIG. 36 is a diagram illustrating the light incidence reduction portion W of the seventh embodiment. [Figure 37] FIG. 37 is a diagram illustrating another example of the seventh embodiment. [Figure 38] FIG. 38 is a diagram illustrating another example of the seventh embodiment. [Figure 39] FIG. 39 is a diagram for explaining an equation relating to the height of the area boundary member in the seventh embodiment. [Diagram 40] FIG. 40 is a diagram for explaining an equation relating to the height of the area boundary member in the seventh embodiment. [Diagram 41] FIG. 41 is a diagram illustrating the light incidence reduction portion W of the eighth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of an optical member and an imaging device according to the present invention will now be described with reference to the accompanying drawings.

[0021] <Configuration of imaging device> 1 is a diagram showing a schematic configuration of an imaging device equipped with a lens device having an optical member. The imaging device 10 is an imaging device (multispectral camera) 10 that captures a multispectral image, and includes a lens device 100 and an imaging device body 200. The imaging device body 200 includes an image sensor 210 and a signal processing unit 230. The lens device 100 includes an optical system 100A configured with a first lens 110 and a second lens 120, and an optical member (wavelength polarization filter unit) 130 arranged at or near the pupil position of the optical system 100A. In the following description, the object side refers to the positive side of the Z axis, and the image side refers to the negative side of the Z axis.

[0022] <Image Generation Section Configuration> 2 is a diagram showing the configuration of the signal processing unit 230. The signal processing unit 230 includes an analog signal processing unit 232 that performs analog signal processing on a signal output from the image sensor 210, an image generating unit 234, and a coefficient storage unit 236. The image generating unit 234 (processor) includes a non-temporary recording medium (not shown) such as a ROM (Read Only Memory) that records computer-readable code of an imaging program that causes a computer to execute an imaging method, and a temporary storage area (not shown) for work, and generates a plurality of images (spectral images) corresponding to the wavelength bands of a plurality of optical filters arranged in the optical system 100A based on a plurality of image signals (image signals corresponding to different polarization directions) output from the image sensor 210. The image generating unit 234 can generate images of wavelength bands λ1, λ2, and λ3 (three-band multispectral images).

[0023] The functions of the image generating unit 234 described above can be realized by using various processors and recording media. The various processors include, for example, a CPU (Central Processing Unit), which is a general-purpose processor that executes software (programs) to realize various functions, a GPU (Graphics Processing Unit), which is a processor specialized for image processing, and a programmable logic device (PLD), which is a processor whose circuit configuration can be changed after manufacturing such as an FPGA (Field Programmable Gate Array). Each function may be realized by one processor, or may be realized by multiple processors of the same type or different types (for example, multiple FPGAs, or a combination of a CPU and an FPGA, or a combination of a CPU and a GPU). Also, multiple functions may be realized by one processor. More specifically, the hardware structure of these various processors is an electric circuit that combines circuit elements such as semiconductor elements.

[0024] When the above-mentioned processor or electrical circuit executes software (program), the code readable by the computer (e.g., various processors and electrical circuits constituting the image generation unit 234, and / or a combination thereof) of the software to be executed is stored in a non-transitory recording medium such as a ROM, and the computer references the software.

[0025] When the imaging device 10 receives a shooting instruction input from a shutter release switch (not shown) or the like, it performs exposure control in the imaging element 210. An optical image of a subject formed on the light receiving surface of the imaging element 210 by this exposure control is converted into an electrical signal by the imaging element 210. An electric charge corresponding to the amount of light incident on a photodiode 212 (see FIG. 3) is accumulated in each pixel of the imaging element 210, and an electrical signal corresponding to the amount of electric charge accumulated in each pixel is read out and output from the imaging element 210 as an image signal.

[0026] <Image sensor configuration> Fig. 3 is a diagram showing a schematic configuration of the image sensor 210, and Fig. 4 is a cross-sectional view showing a schematic configuration of one pixel shown in Fig. 3. The image sensor 210 is a CMOS (Complementary Metal-Oxide Semiconductor) type image sensor (image sensor), and is a monochrome image sensor having a pixel array layer 211, a polarizing filter element array layer 213, and a microlens array layer 215. The layers are arranged in the order of the pixel array layer 211, the polarizing filter element array layer 213 (plurality of polarizing elements), and the microlens array layer 215 from the image (surface) side toward the object side. Note that the image sensor 210 is not limited to a CMOS type, and may be an XY address type or a CCD (Charge Coupled Device) type image sensor.

[0027] The pixel array layer 211 is configured by arranging a large number of photodiodes 212 (a plurality of pixel groups) two-dimensionally. One photodiode 212 constitutes one pixel. The photodiodes 212 are regularly arranged along the horizontal direction (x direction) and the vertical direction (y direction).

[0028] The polarizing filter element array layer 213 is configured by two-dimensionally arranging four types of polarizing filter elements (polarizers) 214A, 214B, 214C, and 214D (multiple polarizing elements) with different polarization directions (polarization directions of light to be transmitted). The polarization directions of the polarizing filter elements 214A, 214B, 214C, and 214D can be, for example, 0°, 45°, 90°, and 135°. These polarization directions can correspond to the polarization direction of the polarizing filter 148 (see FIG. 8) in the optical member 130. The imaging element 210 includes multiple image groups that selectively receive any of the light transmitted through the multiple opening regions by the polarizing filter elements 214A to 214D. These polarizing filter elements 214A to 214B are arranged at the same intervals as the photodiodes 212, and are provided for each pixel.

[0029] The microlens array layer 215 includes microlenses 216 arranged for each pixel.

[0030] <Lens device configuration> Fig. 5 is an external perspective view of lens device 100, and Fig. 6 is a cross-sectional view of lens device 100 in the direction of optical axis L. As shown in these figures, lens device 100 has a single imaging optical system composed of first lens 110 and second lens 120 arranged in barrel 102. First lens 110 and second lens 120 may be a lens group composed of a plurality of lenses. Also, barrel 102 has slit 108 formed at the pupil position (near the pupil) of lens device 100, and optical member 130 is inserted into slit 108 and arranged with its optical axis coinciding with optical axis L of the imaging optical system.

[0031] FIG. 7 is an external view of the frame 132, and FIG. 8 is a diagram showing an example of the configuration of the optical member 130. Specifically, (a) to (f) in FIG. 7 are a rear view, a top view, a left side view, a bottom view, a perspective view, and a front view, respectively. As shown in (e) and (f) in FIG. 7, the frame 132 has four opening regions 132A to 132D. The shapes of the opening regions 132A to 132D are not limited to sector shapes, and may be other shapes such as circular, rectangular, rectangular, and polygonal. When acquiring three images (images of wavelength bands λ1, λ2, and λ3), three opening regions are sufficient, and therefore the opening region 132D is shielded by a shielding member B as shown in FIG. 8. In this example, the opening regions 132A to 132C are made effective by shielding the opening region 132D by the shielding member B, but this is not limited thereto. For example, without providing the shielding member B, an optical filter having the same wavelength band as any one of the aperture regions 132A to 132C and a polarizing filter having the same polarization direction may be disposed in the aperture region 132D.

[0032] As shown in FIG. 8, filter sets 140A to 140C (ND (Neutral Density) filter, optical filter, optical path length compensation filter, and polarizing filter) are arranged in three open areas (132A to 132C) (rear side of frame body 132) that are not shielded from light. Note that FIG. 8 shows a case where each of filter sets 140A to 140C is composed of four filters. In each of filter sets 140A to 140C, the filter closest to the object (e.g., ND filter) is provided on the object side surface of frame body 132, and the remaining three filters (e.g., optical filter, optical path length compensation filter, and polarizing filter) are provided on the image side surface of frame body 132. Note that the arrangement of the filters and the position of frame body 132 arranged between the filters are not limited to the above example, and various modes may be adopted.

[0033] FIG. 9 is a diagram illustrating the configuration of the filter sets 140A to 140C.

[0034] The filter set 140A is composed of four different types of filters. The filter set 140A is composed of, in order from the object side, an ND filter 142A, an optical filter 144A that transmits the wavelength band λ1, an optical path length correction filter 146A, and a polarizing filter 148A with a polarization direction of 0°. Similarly, the filter set 140B is composed of, in order from the object side, an ND filter 142B, an optical filter 144B that transmits the wavelength band λ2, an optical path length correction filter 146B, and a polarizing filter 148B with a polarization direction of 60°. Similarly, the filter set 140C is composed of, in order from the object side, an ND filter 142C, an optical filter 144C that transmits the wavelength band λ3, an optical path length correction filter 146C, and a polarizing filter 148C with a polarization direction of 120°. In this example, the polarization directions of the polarizing filters 148A to 148C are different from each other because three spectral images, a spectral image in a wavelength band λ1, a spectral image in a wavelength band λ2, and a spectral image in a wavelength band λ3, are acquired. For example, when acquiring two spectral images, polarizing filters having at least two different polarization directions are used. In addition, λ1, λ2, and λ3 have some different wavelength bands.

[0035] FIG. 10 is a diagram showing the relationship between the aperture area and the filter configuration.

[0036] Optical member 130 has opening regions 132A to 132D formed by frame body 132. Specifically, area boundary members 132(α) of frame body 132 are disposed at the boundaries between opening region 132A and opening region 132D and between opening region 132B and opening region 132C, and area boundary members 132(β) are disposed at the boundaries between opening region 132A and opening region 132B and between opening region 132C and opening region 132D.

[0037] <Suppression of crosstalk> As described above, the filter sets 140A to 140C are composed of a combination of multiple filters. When the filter sets 140A to 140C are composed of multiple filters in this way, the filter sets 140A to 140C themselves have a thickness. When the filter sets 140A to 140C themselves have a thickness, a case occurs in which a light beam obliquely incident on each aperture region does not pass only through a filter intended in the design. For example, a case occurs in which a light beam obliquely incident on the aperture region 132A also passes through a filter provided in the aperture region 132B. In the following description, the transmission of a light beam across adjacent aperture regions in this way is called crosstalk. When crosstalk occurs, it affects the image quality deterioration and spectroscopic accuracy of the obtained image. In particular, when a light beam that has crosstalked through a filter (an optical filter and a polarizing filter in the above example) that has a large effect on image data passes through, it has a large effect on the image quality and spectroscopic accuracy of the image. A specific example of the occurrence of crosstalk will be described below.

[0038] Fig. 11 is a diagram illustrating a case where crosstalk occurs. Fig. 11(A) is a diagram showing opening regions 132A to 132D formed in frame body 132, and Fig. 11(B) is a diagram showing cross sections of filter sets 140B and 140C arranged in opening region 132B and opening region 132C.

[0039] The aperture region 132B and the aperture region 132C are adjacent to each other. The aperture region 132B includes an ND filter 142B, an optical filter 144B, an optical path length correction filter 146B, and a polarizing filter 148B. The aperture region 132C includes an ND filter 142C, an optical filter 144C, an optical path length correction filter 146C, and a polarizing filter 148C.

[0040] The light ray U obliquely incident on the aperture region 132C first enters the ND filter 142C of the aperture region 132C, and then enters the optical filter 144C. After exiting the optical filter 144C, the light ray U passes through the optical filter 144B, the optical path length correction filter 146B, and the polarizing filter 148B of the aperture region 132B. Then, the light ray U passes through the optical filter 144C that transmits the wavelength band λ3, and then passes through the optical filter 144B that transmits the wavelength band λ2. As described above, after entering the aperture region 132C, the light ray U passes through the ND filter 142C, the optical filter 144C, the optical filter 144B, the optical path length correction filter 146B, and the polarizing filter 148B. Therefore, in this case, crosstalk occurs due to the light ray U, which has a negative effect on the quality of the obtained image and the spectroscopic accuracy.

[0041] Below, we propose an optical member 130 that can suppress crosstalk caused by the obliquely incident light rays U and suppress the deterioration of image quality and the adverse effects on spectroscopic accuracy, and an imaging device 10 that includes the optical member 130. Note that in the following explanation, suppression of crosstalk caused by the obliquely incident light rays U will be described, but light rays other than the light rays U (for example, light rays that are symmetrical to the line of the boundary portion BL) can also be suppressed in the same manner.

[0042] <First embodiment> A description will now be given of the light incidence reduction portion W of the first embodiment of the optical member 130. In this embodiment, the light incidence reduction portion W is provided at the boundary portion BL (see FIG. 12) between the filter side surfaces.

[0043] 12 is a diagram illustrating the light incidence reduction portion W of this embodiment. In the following description, the boundary portion BL between the opening region 132B and the opening region 132C will be described, but a similar light incidence reduction portion W is also provided between the opening region 132A and the opening region 132B.

[0044] The light incidence reduction section W is provided at the boundary BL between the opening region 132C (first opening region) and the opening region 132B (second opening region). The light incidence reduction section W is composed of the area boundary member 132(α) of the frame body 132 and a wall member 202 extending from the area boundary member 132(α) between the side surfaces of the filter set 140B and the filter set 140C toward the optical axis direction (lamination direction of the filters). The wall member 202 is present and extends from the object side end of the filter set 140B (140C) to the image side end entirely. The area boundary member 132(α) and the wall member 202 may be formed integrally or separately. The light incidence reduction section W can prevent the light ray U incident from the opening region 132C from entering the opening region 132B, and can suppress the occurrence of crosstalk. Here, suppression includes the meaning of preventing or reducing (similar in the following description).

[0045] FIG. 13 is a diagram illustrating another example of the first embodiment.

[0046] The light incidence reduction section W of this example is provided in a part of the boundary BL between the opening area 132B and the opening area 132C. The light incidence reduction section W is composed of the area boundary member 132(α) of the frame body 132 and a wall member 204 extending from the area boundary member 132(α) to between the side surface of the filter set 140B and the filter set 140C in the optical axis direction. The wall member 204 extends only from the area boundary member 132(α) toward the image side. The light incidence reduction section W prevents or reduces the light U transmitted through the optical filter 144C from being incident on other opening areas. On the other hand, for example, a light ray transmitted through the ND filter 142C may be incident on the opening area 132B, but due to the nature of the ND filter, crosstalk caused by such a light ray has little effect on the image quality and spectroscopic accuracy of the obtained image.

[0047] (For a 3x3 frame) In the above description, the frame 132 having 2×2 opening areas 132A-132D has been described, but application of this embodiment is not limited to this frame 132. For example, this embodiment can also be applied to a frame having nine 3×3 opening areas.

[0048] FIG. 14 is a conceptual diagram showing a frame 932 that is attached to the optical member 130 in place of the frame 132. As shown in FIG.

[0049] The frame body 932 has 3×3 opening regions 932A to 932I. The frame body 932 is provided in place of the frame body 132 in the optical member 130 shown in FIGS. 5 and 6. By using the frame body 932, the imaging device 10 can acquire up to nine different image data. In addition, corresponding to the area boundary members 132(α) and 132(β) in the frame body 132, the frame body 932 is provided with area boundary members 932(α1), 932(α2), 932(β1), and 932(β2).

[0050] 15 is a diagram illustrating another example of the first embodiment. In the following description, the boundary BL between the opening regions 932C, 932F, and 932I will be described, but similar light incidence reduction portions W are also provided in the boundary BL between the other opening regions.

[0051] The light incidence reduction portion W of this example is provided in the frame body 932 described in Fig. 14. In Fig. 15, an opening region 932C, an opening region 932F, and an opening region 932I of the frame body 932 are shown.

[0052] The light incidence reduction section W of this example is provided at the boundary BL between the opening region 932C and the opening region 932F, and at the boundary BL between the opening region 932F and the opening region 932I. The light incidence reduction section W is composed of the area boundary member 132 (α1) of the frame body 932, and a wall member 206 extending from the area boundary member 132 (α1) to between the side surfaces of the filter set 140B and the filter set 140C in the optical axis direction. The light incidence reduction section W is composed of the area boundary member 932 (α2) of the frame body 932, and a wall member 208 extending from the area boundary member 932 (α2) to between the side surfaces of the filter set 140B and the filter set 140C in the optical axis direction. The wall members 206 and 208 exist from the object side end to the image side end of the filter set. The light incidence reduction section W can prevent the light ray U incident from the opening region 932F from entering the opening region 932C, thereby suppressing the occurrence of crosstalk. The light incidence reduction section W can also prevent the light ray U incident from the opening region 932I from entering the opening region 932F, thereby suppressing the occurrence of crosstalk.

[0053] <Second embodiment> A second embodiment of the optical member 130 will be described. In this embodiment, a space (gap) is provided as a light incidence reduction portion W at the boundary portion BL to totally reflect the light U.

[0054] 16 is a diagram illustrating a light beam incidence reduction portion W according to the second embodiment. However, the following description will be given of a case where the incident angle of a light beam U satisfies the angle at which total reflection occurs.

[0055] The light incidence reduction section W is provided at the boundary BL between the aperture region 132B and the aperture region 132C. Specifically, a space 302 is provided at the boundary BL from the object side end to the image side end of the filter set 140B and the filter set 140C as the light incidence reduction section W. When the incident angle of the light ray U satisfies a predetermined condition, this space 302 can totally reflect the light ray U and prevent the light ray U from entering the aperture region 132B. In this way, when the light ray U satisfies a predetermined condition, the space 302 can totally reflect the light ray U and prevent it from entering the aperture region 132B, thereby suppressing the occurrence of crosstalk.

[0056] FIG. 17 is a diagram illustrating another example of the second embodiment.

[0057] The light incidence reduction part W in this example is provided at the boundary part BL between the opening area 132B and the opening area 132C. Specifically, a space 304 is provided at the boundary part BL from the object side end to the image side end of the filter set 140B and the filter set 140C as the light incidence reduction part W. The space 304 is inclined at the upper end of the optical filter 144C, the optical path length correction filter 146C, and the polarizing filter 148C from the lower end of the area boundary member 132 (α) toward the boundary part BL. By having the space 304 in this way, it becomes easier to satisfy the condition for the total reflection of the light ray U. In other words, by having the space 304 inclined, it becomes possible to make the angle of incidence of the light ray U shallow. In this way, when the light ray U satisfies a predetermined condition, the space 304 can totally reflect the light ray U and prevent it from entering the opening area 132B, and the occurrence of crosstalk can be suppressed.

[0058] (For a 3x3 frame) An example in which a 3×3 frame 932 (see FIG. 14) is provided with a light incidence reduction section W of the second embodiment will be described.

[0059] FIG. 18 is a diagram illustrating another example of the second embodiment.

[0060] The light incidence reduction section W is provided at the boundary BL between the aperture region 932C and the aperture region 932F. The light incidence reduction section W is also provided at the boundary BL between the aperture region 932F and the aperture region 932I. Specifically, the spaces 306 and 308 are provided at the boundary BL from the object side end to the image side end of the filter set as the light incidence reduction section W. When the incident angle of the light ray U satisfies a predetermined condition, the spaces 306 and 308 can totally reflect the light ray U, and can prevent the light ray U from entering an aperture region other than the aperture region into which it has once entered, thereby suppressing the occurrence of crosstalk.

[0061] <Third embodiment> A third embodiment of the optical member 130 will be described. In this embodiment, a reflecting portion that guides the reflected light of the light ray U to the object side is provided at the boundary portion BL as the light incidence reduction portion W.

[0062] FIG. 19 is a diagram illustrating a light incidence reduction portion W according to the third embodiment.

[0063] The light incidence reduction section W is provided with a return section 402 at the boundary BL between the opening region 132B and the opening region 132C. Specifically, as the light incidence reduction section W, a return section 402 inclined from the object side to the image side is provided at the boundary BL between the ND filter 142B and the ND filter 142C, a return section 402 inclined from the object side to the image side is provided at the boundary BL between the optical filter 144B and the optical filter 144C, a return section 402 inclined from the object side to the image side is provided at the boundary BL between the optical path length correction filter 146B and the optical path length correction filter 146C, and a return section 402 inclined from the object side to the image side is provided at the boundary BL between the polarizing filter 148B and the polarizing filter 148C. The return section 402 reflects the light ray U and returns the reflected light of the light ray U to the object side. The return portion 402 can prevent the light ray U from entering the opening region 132B by reflecting the light ray U, and can suppress the occurrence of crosstalk. Furthermore, the return portion 402 can prevent the reflected light of the light ray U from becoming stray light by returning the reflected light of the light ray U to the object side, and can suppress flare and ghosts.

[0064] FIG. 20 is a diagram illustrating another example of the third embodiment.

[0065] The light incidence reduction section W is provided with a return section 404 at the boundary BL between the opening region 132B and the opening region 132C. Specifically, the return section 404 having an inclination from the object side to the image side is provided at the boundary BL between the ND filter 142B and the optical filter 144B and the ND filter 142C and the optical filter 144C. The return section 404 reflects the light ray U and returns the reflected light of the light ray U to the object side. As shown in the figure, a wall member is provided at the boundary BL between the optical path length correction filters 146B and 146C and the polarizing filters 148B and 148C as described in the first embodiment. The return portion 404 reflects the light ray U that has passed through the ND filter 142C and the optical filter 144C and guides the reflected light toward the object side, thereby preventing or reducing the light ray U from entering the opening region 132B and suppressing the occurrence of crosstalk, and further preventing or reducing the reflected light of the light ray U from becoming stray light, thereby suppressing flare and ghosting.

[0066] (For a 3x3 frame) An example in which a 3×3 frame 932 (see FIG. 14) is provided with a light incidence reduction section W of the third embodiment will be described.

[0067] FIG. 21 is a diagram illustrating another example of the third embodiment.

[0068] The light incidence reduction unit W is provided with a return portion 406 at the boundary BL between the opening region 932C and the opening region 932F, and a return portion 408 at the boundary BL between the opening region 932F and the opening region 932I. 9 42C and ND filters 9 A return portion 406 having an inclination from the object side to the image side is provided at the boundary portion BL with 42F, and an optical filter 9 44C and optical filters 9 A return portion 406 having an inclination from the object side to the image side is provided at the boundary portion BL with 44F, and the optical path length correction filter 946C and optical path length compensation filter 9 A return portion 406 having an inclination from the object side to the image side is provided at the boundary portion BL with 46F, and a polarizing filter 9 48C and polarizing filter 9 A return portion 406 having a slope from the object side to the image side is provided at the boundary BL with 48F. 9 42F and ND filter 9 A return portion 408 having an inclination from the object side to the image side is provided at the boundary portion BL with the optical filter 42I. 9 44F and optical filters 9 A return portion 408 having an inclination from the object side to the image side is provided at the boundary portion BL with the optical path length correction filter 44I. 9 46F and optical path length correction filter 9 A return portion 408 having an inclination from the object side to the image side is provided at the boundary portion BL with the polarizing filter 46I. 9 48F and polarizing filter 9 A return portion 408 having a slope from the object side to the image side is provided at a boundary portion BL with 48I. The return portions 406 and 408 reflect the light ray U and prevent it from entering an area other than the area where the light ray U entered, thereby suppressing the occurrence of crosstalk. Furthermore, the return portions 406 and 408 return the reflected light of the light ray U to the object side, thereby suppressing the reflected light of the light ray U from becoming stray light, and suppressing flare and ghosts.

[0069] FIG. 22 is a diagram for explaining the return angle of the return portion 402. As shown in FIG.

[0070] When the angle of the returning portion 402 is α (rad) and a light ray U is reflected by the returning portion 402 at a light ray angle θ (rad), the following formula (1) must be satisfied in order for the reflected light to be reflected toward the object side.

[0071] θ+2α-2ε>π / 2…(1) Here, ε (rad) indicates the inclination of the frame 132.

[0072] From the above formula (1), the return angle α (rad) of the return portion 402 can be expressed by the following formula (2).

[0073] α>π / 4-θ / 2+ε…(2) Here, the light ray angle θ (rad) represents the maximum angle among the light ray angles at all image heights that pass through the center of the frame 132. In the case of the frame 932, the light ray angle is θ (rad) at the height of the frame 932. The light ray angle at the height of the frame 932 represents the maximum angle among the light ray angles at all image heights that pass through the height of the frame 932. These also apply in the following explanation.

[0074] <Fourth embodiment> A fourth embodiment of the optical member 130 will be described. The light incidence reduction portion W of this embodiment is composed of a first light-shielding portion provided along the optical axis L at the boundary portion BL, and a second light-shielding portion extending in a direction along a plane perpendicular to the optical axis L from the boundary portion BL.

[0075] FIG. 23 is a diagram illustrating the light incidence reduction portion W of the fourth embodiment.

[0076] The first light shielding portion 502 of the light incidence reduction portion W is provided at the boundary portion BL between the opening region 132B and the opening region 132C. The first light shielding portion 502 is a wall member extending from the region boundary member 132(α) of the frame body 132 to the side surface of the filter set 140B and the filter set 140C toward the optical axis L direction. The first light shielding portion 502 is present and extends from the object side end of the filter set to the image side end. The second light shielding portion 504 of the light incidence reduction portion W is provided on the image side of the filter set 140 along a plane perpendicular to the optical axis L from the boundary portion BL. For example, the second light shielding portion 504 is configured by providing another frame body similar to the frame body 132 on the image side of the filter set 140. In this way, the light ray incidence reduction section W composed of the first light shielding section 502 and the second light shielding section 504 can prevent the light ray U incident from the opening area 132C from entering the opening area 132B, thereby suppressing the occurrence of crosstalk and also suppressing the occurrence of flare and ghosts caused by the reflected light of the light ray U reflected by the first light shielding section 502.

[0077] FIG. 24 is a diagram illustrating another example of the fourth embodiment.

[0078] The light incidence reduction section W is composed of a first light shielding section 502 and a second light shielding section 504. The height of the area boundary member 132(α) is formed higher and the height of the second light shielding section 504 is formed lower than the example described in FIG. 23. In this way, the light incidence reduction section W composed of the first light shielding section 502 and the second light shielding section 504 can prevent the light ray U incident from the opening area 132C from entering the opening area 132B, suppressing the occurrence of crosstalk, and can suppress the occurrence of flare and ghost caused by the reflected light of the light ray U reflected by the first light shielding section 502. Note that the reduction in the amount of light can be suppressed by appropriately adjusting the height of the second light shielding section 504 according to the height of the area boundary member 132(α).

[0079] FIG. 25 is a diagram illustrating another example of the fourth embodiment.

[0080] The first light shielding portion 510 of the light incidence reduction portion W is provided at the boundary portion BL between the opening region 132B and the opening region 132C. Specifically, as the first light shielding portion 510, a space is provided at the boundary portion BL from the object side end to the image side end of the filter set 140B and the filter set 140C. This first light shielding portion 510 can totally reflect the light ray U when the incident angle of the light ray U satisfies a predetermined condition. In addition, the second light shielding portion 512 of the light incidence reduction portion W is provided on the image side of the filter set 140 along a plane perpendicular to the optical axis L from the boundary portion BL. In this way, the light incidence reduction portion W composed of the first light shielding portion 510 and the second light shielding portion 512 can prevent the light ray U incident from the opening region 132C from entering the opening region 132B, thereby suppressing the occurrence of crosstalk, and can also suppress the occurrence of flare and ghost caused by the light ray U reflected by the first light shielding portion 502.

[0081] (For a 3x3 frame) An example in which a 3×3 frame 932 (see FIG. 14) is provided with a light incidence reduction section W of the fourth embodiment will be described.

[0082] FIG. 26 is a diagram illustrating another example of the fourth embodiment.

[0083] The first light shielding portion 514 of the light incidence reduction portion W is provided at the boundary portion BL between the opening region 932C and the opening region 932F. The first light shielding portion 518 is provided at the boundary portion BL between the opening region 932F and the opening region 932I. The first light shielding portions 514 and 518 are wall members extending along the optical axis L direction at the boundary portion BL. The wall members extend from the object side end to the image side end of the filter set. The second light shielding portion 516 and the second light shielding portion 520 of the light incidence reduction portion W are provided on the image side of the filter set 140 along a plane perpendicular to the optical axis L from the boundary portion BL. For example, the second light shielding portion 516 and the second light shielding portion 520 are configured by providing another frame body similar to the frame body 932 on the image side of the filter set. In this way, the light ray incidence reduction section W composed of the first light shielding section 514 and the second light shielding section 516, and the light ray incidence reduction section W composed of the first light shielding section 518 and the second light shielding section 520, can prevent the light ray U from entering an opening area other than the opening area into which it entered, thereby suppressing the occurrence of crosstalk, and can also suppress the occurrence of flare and ghosts caused by the reflected light of the light ray U reflected by the first light shielding section 514 (first light shielding section 518).

[0084] FIG. 27 is a diagram illustrating the correlation between the height of the area boundary member 132(α) and the height of the second light-shielding portion.

[0085] Assuming that the height of the area boundary member 132 (α) is h1 and the height of the second shading portion 504 is h2, in order for the second shading portion 504 to block the reflected light of the light ray U, it is necessary to satisfy the conditions of the following equations (3) and (4).

[0086] h2>(dx)tan(θ+ε)…(3) xtan(θ+ε)=h1…(4) Here, the light ray angle is θ (rad), the filter thickness of the area boundary member 132 (α) and the second light blocking portion 504 is d, and the inclination of the frame 132 is ε (rad).

[0087] Calculating the equation for h2 from the above equations (3) and (4), we obtain the following equation (5).

[0088] h2>dtan(θ+ε)-h1…(5) In the above formula, the light ray angle θ (rad) is for the 2×2 frame 132, and in the case of the 3×3 frame 932, the light ray angle θ (rad) is at the frame height.

[0089] <Fifth embodiment> A fifth embodiment of the optical member 130 will be described. The light incidence reduction portion W of this embodiment is composed of a first light shielding portion provided along the optical axis L at the boundary portion BL, and a second light shielding portion extending in a direction along a plane perpendicular to the optical axis L from the boundary portion BL. Furthermore, the first light shielding portion is provided with an inclination that reduces the reflection angle of the reflected light.

[0090] FIG. 28 is a diagram illustrating the light incidence reduction portion W of the fifth embodiment.

[0091] The first light shielding portion 602 of the light incidence reduction portion W is provided at the boundary portion BL between the opening region 132B and the opening region 132C. The first light shielding portion 602 is a space extending in the direction of the optical axis L between the area boundary member 132(α) of the frame body 132 and the side surface of the filter set 140B and the filter set 140C from the area boundary member 132(α). The first light shielding portion 602 is inclined from the lower end portion of the area boundary member 132(α) toward the boundary portion BL so as to suppress the reflection angle of the reflected light of the light ray U. The second light shielding portion 604 of the light incidence reduction portion W is provided on the image side of the filter set 140 along a plane perpendicular to the optical axis L from the boundary portion BL. For example, the second light shielding portion 604 is configured by providing another frame body similar to the frame body 132 on the image side of the filter set. In this way, the light ray incidence reduction section W composed of the first light shielding section 602 and the second light shielding section 604 can prevent the light ray U incident from the opening region 132C from entering the opening region 132B, suppressing the occurrence of crosstalk and suppressing the occurrence of flare and ghost caused by the reflected light of the light ray U reflected by the first light shielding section 602. Furthermore, since the first light shielding section 602 is inclined and the reflection angle of the reflected light is suppressed, the height of the second light shielding section 604 can be suppressed and a decrease in the amount of light can be suppressed.

[0092] FIG. 29 is a diagram illustrating another example of the fifth embodiment.

[0093] The first light shielding portion 606 of the light incidence reduction portion W is provided at the boundary portion BL between the opening region 132B and the opening region 132C. The first light shielding portion 606 is composed of a space 606(a) and a wall member 606(b). The space 606(a) is a space extending toward the optical axis L direction between the side surfaces of the filter set 140B and the filter set 140C. The wall member 606(b) is inclined so as to suppress the reflection angle of the reflected light of the light ray U. Specifically, the wall member 606(b) has an inclination from the lower end portion of the area boundary member 132(α) toward the boundary portion BL. The second light shielding portion 608 of the light incidence reduction portion W is provided on the image side of the filter set 140 along a plane perpendicular to the optical axis L from the boundary portion BL. In this way, the light ray incidence reduction section W composed of the first light shielding section 606 and the second light shielding section 608 can prevent the light ray U incident from the opening region 132C from entering the opening region 132B, suppressing the occurrence of crosstalk and suppressing the occurrence of flare and ghost caused by the reflected light of the light ray U reflected by the first light shielding section 606. Furthermore, since the first light shielding section 606 is inclined and the reflection angle of the reflected light is suppressed, the height of the second light shielding section 608 can be suppressed and a decrease in the amount of light can be suppressed.

[0094] (For a 3x3 frame) An example in which a 3×3 frame 932 (see FIG. 14) is provided with a light incidence reduction section W of the fifth embodiment will be described.

[0095] FIG. 30 is a diagram illustrating another example of the fifth embodiment.

[0096] The first light-shielding portion 610 of the light-entrance reduction portion W is provided at the boundary portion BL between the opening region 932C and the opening region 932F. The first light-shielding portion 614 of the light-entrance reduction portion W is provided at the boundary portion BL between the opening region 932F and the opening region 932I. The first light-shielding portion 610 and the first light-shielding portion 614 are wall members extending in the direction of the optical axis L between the area boundary member 932(α) of the frame body 932 and the side surfaces of the filter set 140B and the filter set 140C from the area boundary member 932(α). The first light-shielding portion 610 and the first light-shielding portion 614 are inclined from the lower end portions of the area boundary member 932(α1) and the area boundary member 932(α2) toward the boundary portion BL so as to suppress the reflection angle of the reflected light of the light ray U. Further, the second light shielding portion 612 and the second light shielding portion 616 of the light incidence reduction portion W are provided on the image side of the filter set 140 along a plane perpendicular to the optical axis L from the boundary portion BL. For example, the second light shielding portion 612 and the second light shielding portion 616 are configured by providing another frame body similar to the frame body 932 on the image side of the filter set. In this manner, the light incidence reduction portion W configured with the first light shielding portions 610 and 614 and the second light shielding portions 612 and 616 can prevent the light from entering an aperture region other than the aperture region into which it once entered, suppressing the occurrence of crosstalk, and suppressing the occurrence of flare and ghost due to the reflected light of the light ray U reflected by the first light shielding portions 610 and 614. Furthermore, since the first light shielding portions 610 and 614 are inclined and the reflection angle of the reflected light is suppressed, the height of the second light shielding portions 612 and 616 can be suppressed, and the decrease in the amount of light can be suppressed.

[0097] Sixth embodiment A sixth embodiment of the optical member 130 will be described. The light incidence reduction portion W of this embodiment is composed of an area boundary member 132(α) whose height is appropriately set.

[0098] FIG. 31 is a diagram illustrating the light incidence reduction portion W of the sixth embodiment.

[0099] An area boundary member 132(α) having an appropriate height is provided as the light incidence reduction portion W. The area boundary member 132(α) is provided on the object side surfaces of the optical filters 144B and 144C. By appropriately setting the height of the area boundary member 132(α) in this manner, it is possible to prevent or reduce the incidence of the light ray U transmitted through the optical filter 144C into the opening area 132B, and to suppress the occurrence of crosstalk.

[0100] FIG. 32 is a diagram for explaining another example of the sixth embodiment, and FIGS. 33 and 34 are diagrams for explaining a reference example of the sixth embodiment.

[0101] In the example shown in FIG. 32, the filter set 140B is arranged in the order of the optical path length correction filter 146B, the ND filter 142B, the optical filter 144B, and the polarizing filter 148B. The filter set 140C also has filters arranged in the same order as the filter set 140B. The optical filter 144B and the polarizing filter 148B are provided in close contact with each other, and the optical filter 144C and the polarizing filter 148C are provided in close contact with each other. Here, "close" means that the filters are in close contact with each other, and even if the area boundary member 132(α) is provided between the filters, the filters are said to be in close contact with each other. The light transmitted through the optical filters 144B and 144C and the polarizing filters 148B and 148C has a relatively large effect on the image quality and spectroscopic accuracy of the obtained image. Therefore, in order to suppress the occurrence of crosstalk between the optical filters 144B and 144C and the polarizing filters 148B and 148C, the area boundary member 132(α) having an appropriate height is provided between the optical filters 144B and 144C and the polarizing filters 148B and 148C. By appropriately setting the height of the area boundary member 132(α) and providing it between the optical filters 144B and 144C and the polarizing filters 148B and 148C in this manner, it is possible to prevent or reduce the incidence of the light ray U transmitted through the optical filter 144C into the opening area 132B, and to suppress the occurrence of crosstalk.

[0102] In the example shown in FIG. 33, in the filter set 140B, the optical path length correction filter 146B, the optical filter 144B, the ND filter 142B, and the polarizing filter 148B are arranged in this order. In the filter set 140C, the filters are arranged in the same order as in the filter set 140B. The area boundary member 132(α) is arranged between the ND filter 142B (142C) and the polarizing filter 148B (148C). This makes it possible to prevent or reduce the incidence of the light ray U passing through the ND filter 142B and then entering the polarizing filter 148C, or the light ray U passing through the ND filter 142C and then entering the polarizing filter 148B, thereby suppressing the occurrence of crosstalk.

[0103] In the example shown in FIG. 34, in the filter set 140B, the ND filter 142B, the optical filter 144B, the optical path length correction filter 146B, and the polarizing filter 148B are arranged in this order. In the filter set 140C, the ND filter 142C, the optical filter 144C, the optical path length correction filter 146C, and the polarizing filter 148C are arranged in this order. In this case, the area boundary member 132(α) is disposed between the optical path length correction filter 146B (146C) and the polarizing filter 148B (148C). This can prevent or reduce the incidence of the light ray U passing through the optical path length correction filter 146C and then entering the polarizing filter 148B, or the light ray U passing through the optical path length correction filter 146B and then entering the polarizing filter 148C, thereby suppressing the occurrence of crosstalk.

[0104] FIG. 35 is a diagram for explaining a method for calculating the height of the area boundary member 132(α) in the sixth embodiment.

[0105] 35, the filter set is made up of filters FA1 to FA3 and filters FB1 to FB4. The filters FA1 to FA3 are disposed on the object side of the area boundary member 132(α), and the filters FB1 to FB4 are disposed on the image side of the area boundary member 132(α).

[0106] In the following explanation, we consider the case where crosstalk between (filter FA1) and (filters FB1 and FB2) is suppressed. The filter thickness on the object side of the area boundary member 132(α) is df1 corresponding to filter FA1. Also, the filter thickness on the image side of the area boundary member 132(α) is dr1+dr2 corresponding to filters FB1 and FB2. In this case, if the set height of the area boundary member 132(α) is h, h is set so as to satisfy the condition of the following equation (6).

[0107] h>dtan(θ+ε)…(6) Here, d is the larger value of df1 and dr1+dr2, as shown in the following equation (7).

[0108]

number

[0109] In addition, the above formula is expressed by the light ray angle θ (rad), the inclination ε (rad) of the frame 132, and the filters 1 to m and 1 to n that prevent the light rays from mixing.

[0110] In the above formula, the light ray angle θ (rad) is for the 2×2 frame 132, and in the case of the 3×3 frame 932, the light ray angle θ (rad) is at the frame height.

[0111] Seventh embodiment A seventh embodiment of the optical member 130 will be described. The light incidence reduction section W of this embodiment is composed of a plurality of area boundary members 132(α) arranged between the optical filters 144B and 144C and the polarizing filters 148B and 148C that are provided separately.

[0112] FIG. 36 is a diagram illustrating the light incidence reduction portion W of the seventh embodiment.

[0113] The light incidence reduction section W is composed of two area boundary members 132 (α1) and 132 (α2) provided at the boundary section BL. The area boundary member 132 (α1) is provided between the ND filters 142B and 142C and the optical filters 144B and 144C. The area boundary member 132 (α2) is provided between the optical filters 144B and 144C and the polarizing filters 148B and 148C. This makes it possible to prevent or reduce the incidence of the light ray U entering the polarizing filter 148B after passing through the optical filter 144C, and to suppress the occurrence of crosstalk. The heights of the area boundary members 132 (α1) and 132 (α2) are set based on the inclination, axial misalignment, and filter spacing of each filter (details will be described later).

[0114] FIG. 37 is a diagram illustrating another example of the seventh embodiment.

[0115] The light incidence reduction section W is composed of four area boundary members 132(α1) to 132(α4) provided at the boundary section BL. The area boundary member 132(α1) is provided on the object side surface of the optical path length correction filters 146B and 146C. The area boundary member 132(α2) is provided on the object side surface of the ND filters 142B and 142C. The area boundary member 132(α3) is provided on the object side surface of the optical filters 144B and 144C. The area boundary member 132(α4) is provided on the object side surface of the polarizing filters 148B and 148C. This makes it possible to prevent or reduce the incidence of the light ray U from the opening area 132C into the opening area 132B, and to suppress the occurrence of crosstalk. The height of the area boundary members 132(α1) to 132(α4) is set based on the inclination, axial misalignment, and interval between the filters of each filter (details will be described later).

[0116] (For a 3x3 frame) An example in which a 3×3 frame 932 (see FIG. 14) is provided with a light incidence reduction section W of the seventh embodiment will be described.

[0117] FIG. 38 is a diagram illustrating another example of the seventh embodiment.

[0118] The light incidence reduction section W is composed of eight area boundary members 932(α1) to 932(α8). The eight area boundary members 932(α1) to 932(α8) are provided in pairs at the boundary portion BL on the object side of each filter. Specifically, the area boundary members 932(α1) and 932(α2) are ND filters ( 9 42C, 9 42F, 9 The area boundary member 932 (α3) and the area boundary member 932 (α4) are provided at the boundary portions BL of the area boundary member 932 (α4). 9 44C, 9 44F, 9 The area boundary member 932 (α5) and the area boundary member 932 (α6) are provided at the boundary portions BL of the area boundary members 44I and 44I. 9 46C, 9 46F, 9 The area boundary member 932 (α7) and the area boundary member 932 (α8) are provided at the boundary portions BL of the area boundary member 932 (α7) and the area boundary member 932 (α8). 9 48C, 9 48F, 9 38I). This makes it possible to prevent or reduce the incidence of the obliquely incident light ray U (not shown in FIG. 38) entering an area other than the opening area into which it was once incident, thereby suppressing the occurrence of crosstalk.

[0119] In the above example, the light incidence reduction section W is composed of a plurality of area boundary members 132(α), but this embodiment is not limited to this. For example, as described in the first embodiment above, the light incidence reduction section W may be composed of a wall member provided along the optical axis L at the boundary section BL. Also, as described in the first embodiment above, the light incidence reduction section W may be composed of a combination of a wall member provided along the optical axis L at the boundary section BL and the area boundary member 132(α) described in this embodiment.

[0120] 39 and 40 are diagrams for explaining the formula for the height of the area boundary member in the seventh embodiment.

[0121] As shown in FIG. 39, when setting the height hi of the area boundary member 132 (α1) so that the light ray U does not cross the boundary portion BL by the area boundary member 132 (α1), it is necessary to satisfy the following equation (8).

[0122]

number

[0123]

number

[0124] In the above formula, the values ​​are as follows: Ray angle θ(rad) The inclination of the frame 132 of the region boundary member 132 (α1) is εi (rad). The thickness dfi of the filter on the object side of the region boundary member 132 (α1) The thickness dri of the filter on the image side of the area boundary member 132 (α1)

[0125] As shown in FIG. 40, when a light ray U intersects with the boundary portion BL and is then blocked by the area boundary member 132 (α2), the height hi of the area boundary member 132 (α1) and the height hi+1 of the area boundary member 132 (α2) must satisfy the following equation (10).

[0126]

number

[0127] In the above formula, the values ​​are as follows: Ray angle θ(rad) The inclination of the frame 132 of the region boundary member 132 (α1) is εi (rad). The inclination of the frame 132 of the region boundary member 132 (α2) is εi+1 (rad) The distance Di between the area boundary member 132 (α1) and the area boundary member 132 (α2) Axial deviation xi (rad) of the frame 132 of the region boundary member 132 (α1) Axial deviation xi+1 (rad) of the frame 132 of the region boundary member 132 (α2)

[0128] As described above, in this embodiment, the heights of the area boundary member 132 (α1) and the area boundary member 132 (α2) are set so as to satisfy formula (8) or formula (10).

[0129] <Eighth embodiment> An eighth embodiment of the optical member 130 will be described. The light incidence reduction section W of this embodiment is provided for an optical filter having an object-side surface and an image-side surface that transmit different wavelength bands.

[0130] FIG. 41 is a diagram illustrating the light incidence reduction portion W of the eighth embodiment.

[0131] The optical filter 144(W) has a surface 820(W1) (first surface) on the object side of the aperture region 132B, and a surface 820(W3) (second surface) on the image side. The wavelength transmission characteristics (first wavelength band) of the surface 820(W1) are shown in graph 802, and the wavelength transmission characteristics (second wavelength band) of the surface 820(W3) are shown in graph 806. The optical filter 144(W) has a surface 820(W2) (third surface) on the object side of the aperture region 132C, and a surface 820(W4) (fourth surface) on the image side. The wavelength transmission characteristics (third wavelength band) of the surface 820(W2) are shown in graph 804, and the wavelength transmission characteristics (fourth wavelength band) of the surface 820(W4) are shown in graph 808. As shown in graphs 802 to 808, the optical filter 144(W) has object-side surfaces 820(W1) and 820(W2) with cut surfaces for short wavelengths, and image-side surfaces 820(W3) and 820(W4) with cut surfaces for long wavelengths. Graphs 810 to 816 show the wavelength characteristics of light rays V1 to V4 passing through the optical filter 144(W). The light ray V1 is an obliquely incident light ray, and is blocked because the wavelength is cut over the entire range by the surfaces 820(W2) and 820(W3) as shown in graph 810. The light ray V2 transmits light having a predetermined wavelength band a1 through the surfaces 820(W1) and 820(W3) as shown in graph 812. The light ray V3 transmits light having a predetermined wavelength band a2 through the surfaces 820(W2) and 820(W4) as shown in graph 814. The wavelength bands a1 and a2 are the bands of light intended by the designer. The light ray V4 is an obliquely incident light ray, and as shown in the graph 816, light having the wavelength band A is transmitted. The wavelength band A is not properly cut due to an unintended design. Therefore, the area boundary member 132(α) is provided to block the light ray V4. Specifically, the area boundary member 132(α) is provided near the boundary portion BL of the surface 820(W4). This allows the light ray V4 to be properly blocked. Although the aperture area is reduced by providing the area boundary member 132(α), it is possible to invert the object side and image side of the optical filter 144(W) or to change whether the area boundary member 132(α) is provided on the object side or image side of the optical filter 144(W).

[0132] Although examples of the present invention have been described above, it goes without saying that the present invention is not limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention. [Explanation of symbols]

[0133] 10: Imaging device 100: Lens device 100A: Optical system 102: Telescope tube 108: Slit 110: First lens 120: Second lens 130: Optical components 132:Frame body 132A:Aperture area 132B: Opening area 132C: Opening area 132D: Opening area 140: Filter set 140A: Filter set 140B: Filter set 140C: Filter set 142A: ND filter 142B: ND filter 142C: ND filter 144A: Optical filter 144B: Optical filter 144C :Optical filters 146A: Optical path length correction filter 146B: Optical path length correction filter 146C: Optical path length correction filter 148A: Polarizing filter 148B: Polarizing filter 148C: Polarizing filter 200: Imaging device body 210: Image sensor 211: Pixel array layer 212: Photodiode 213: Polarizing filter element array layer 214A: Polarizing filter element 214B: Polarizing filter element 214C: Polarizing filter element 214D: Polarizing filter element 215: Microlens array layer 216: Microlens 230: Signal processing section 232: Analog signal processing section 234: Image generation unit 236: Coefficient memory section L: Optical axis U : Light ray

Claims

1. a plurality of aperture regions including a first aperture region and a second aperture region that transmit light rays of an optical system; The first opening region and the second opening region are adjacent to each other, a plurality of optical filters disposed in the first opening region and the second opening region, each of which transmits light having at least a portion of a different wavelength band; a plurality of polarizing filters disposed in the first opening region and the second opening region, the polarizing filters having different polarization directions; a space that is provided at a boundary between the first opening region and the second opening region, that extends along an optical axis direction of the optical system, and that totally reflects at least a part of an obliquely incident light beam; Equipped with An optical member, wherein the space has a slope along the optical axis direction of the optical system so that an incident angle of an obliquely incident light ray becomes small.

2. a plurality of aperture regions including a first aperture region and a second aperture region that transmit light rays of an optical system; The first opening region and the second opening region are adjacent to each other, a plurality of optical filters disposed in the first opening region and the second opening region, each of which transmits light having at least a portion of a different wavelength band; a plurality of polarizing filters disposed in the first opening region and the second opening region, the polarizing filters having different polarization directions; a reflecting portion that is provided at a boundary between the first aperture region and the second aperture region, that is inclined from the object side to the image side along an optical axis direction of the optical system, and that reflects an obliquely incident light ray toward the object side; An optical member comprising:

3. The return portion is provided in a plurality of portions along the optical axis direction of the optical system. The optical member according to claim 2 .

4. The return portion is provided for each filter. The optical member according to claim 3 .

5. a wall member provided at a boundary between the first opening region and the second opening region and extending along an optical axis direction of the optical system; The optical member according to claim 2 .

6. a plurality of aperture regions including a first aperture region and a second aperture region that transmit light rays of an optical system; The first opening region and the second opening region are adjacent to each other, a plurality of optical filters disposed in the first opening region and the second opening region, each of which transmits light having at least a portion of a different wavelength band; a plurality of polarizing filters disposed in the first opening region and the second opening region, the polarizing filters having different polarization directions; a light incidence reduction section that reduces incidence of light incident on the first opening region on at least one of the optical filter and the polarizing filter arranged in the second opening region, The light incidence reduction portion is an optical component composed of a first light-shielding portion provided at the boundary between the first opening region and the second opening region, extending along the optical axis direction of the optical system, and a second light-shielding portion arranged on the image side relative to the optical filter and the polarizing filter, and extending from the boundary in a direction along a plane perpendicular to the optical axis.

7. The first light blocking portion has a wall member extending along an optical axis direction of the optical system. The optical member according to claim 6.

8. The wall member has an inclination along the optical axis direction of the optical system so that an incident angle of an obliquely incident light beam becomes small. The optical member according to claim 7.

9. the first light blocking unit further includes an area boundary member that is disposed closer to the object side than the optical filter and the polarizing filter and that extends in a direction along a plane perpendicular to the optical axis; The optical member according to claim 7 or 8.

10. The first light-shielding portion extends along an optical axis direction of the optical system and has a space that totally reflects at least a part of a light ray that is obliquely incident thereon. The optical member according to claim 6.

11. The space has a slope along the optical axis direction of the optical system so that an incident angle of an obliquely incident light beam is small. The optical member according to claim 10.

12. the first light blocking unit further includes an area boundary member that is disposed closer to the object side than the optical filter and the polarizing filter and that extends in a direction along a plane perpendicular to the optical axis; The optical member according to claim 10 or 11.

13. The second light-shielding portion is set to a height capable of blocking light that is obliquely incident and reflected by the first light-shielding portion. The optical member according to claim 6 .

14. a plurality of aperture regions including a first aperture region and a second aperture region that transmit light rays of an optical system; The first opening region and the second opening region are adjacent to each other, a plurality of optical filters disposed in the first opening region and the second opening region, each of which transmits light having at least a portion of a different wavelength band; a plurality of polarizing filters disposed in the first opening region and the second opening region, the polarizing filters having different polarization directions; a region boundary member provided at a boundary between the first opening region and the second opening region and extending in a direction along a plane perpendicular to an optical axis of the optical system; Equipped with the region boundary member is an optical member having a height in a direction along the plane capable of preventing a light ray incident on the first opening region from being incident on the optical filter and the polarizing filter arranged in the second opening region, An optical member in which, when the larger of the sum of thicknesses of filters arranged on the object side of the area boundary member and the sum of thicknesses of filters arranged on the image side is d, a light ray angle is θ, and an inclination of a frame in which the first aperture area and the second aperture area are provided is ε, a height h of the area boundary member satisfies the following formula: h>dtan(θ+ε)

15. the area boundary member is disposed on the object side relative to the optical filter and the polarizing filter; The optical member according to claim 14.

16. a plurality of optical path length compensation filters disposed in the first aperture region and the second aperture region; In the first opening region and the second opening region, the optical path length compensation filter is disposed between the optical filter and the polarizing filter. The optical member according to claim 15.

17. The optical filter and the polarizing filter are provided in close proximity to each other, The area boundary member is disposed between the optical filter and the polarizing filter. The optical member according to claim 14.

18. The optical fiber further includes a plurality of ND filters disposed in the first opening region and the second opening region, In the first aperture region and the second aperture region, the optical filter, the ND filter, and the polarizing filter are arranged in this order from an object side, and the optical filter, the ND filter, and the polarizing filter are provided in close contact with each other, The area boundary member is disposed between the ND filter and the polarizing filter. The optical member according to claim 14.

19. a plurality of optical path length compensation filters disposed in the first aperture region and the second aperture region; in the first aperture region and the second aperture region, the optical filter, the optical path length compensation filter, and the polarizing filter are arranged in this order from an object side, and the optical filter, the optical path length compensation filter, and the polarizing filter are provided in close contact with each other, The area boundary member is disposed between the optical path length correction filter and the polarizing filter. The optical member according to claim 14.

20. a plurality of aperture regions including a first aperture region and a second aperture region that transmit light rays of an optical system; The first opening region and the second opening region are adjacent to each other, a plurality of optical filters disposed in the first opening region and the second opening region, each of which transmits light having at least a portion of a different wavelength band; a plurality of polarizing filters disposed in the first opening region and the second opening region, the polarizing filters having different polarization directions; A plurality of area boundary members are disposed at a boundary between the first opening area and the second opening area, and are disposed at a plurality of locations along an optical axis direction of the optical system, and extend in a direction along a plane perpendicular to the optical axis; An optical member comprising:

21. one of the plurality of area boundary members is disposed between the optical filter and the polarizing filter; The optical member according to claim 20.

22. the area boundary member is provided on an object side surface of each filter; The optical member according to claim 20.

23. The area boundary member is set at a height such that a light ray passing through the area boundary member does not cross the boundary portion. The optical member according to any one of claims 20 to 22.

24. a plurality of aperture regions including a first aperture region and a second aperture region that transmit light rays of an optical system; The first opening region and the second opening region are adjacent to each other, a plurality of optical filters disposed in the first opening region and the second opening region, each of which transmits light having at least a portion of a different wavelength band; a plurality of polarizing filters disposed in the first opening region and the second opening region, the polarizing filters having different polarization directions; a light incidence reduction unit that reduces incidence of light incident on the first opening region on at least one of the optical filter and the polarizing filter arranged in the second opening region; Equipped with the optical filter is provided in the first aperture region with a first surface that transmits a first wavelength band toward the object side of the optical system and a second surface that transmits a second wavelength band toward the image side of the optical system, and in the second aperture region with a third surface that transmits a third wavelength band toward the object side of the optical system and a fourth surface that transmits a fourth wavelength band toward the image side of the optical system, The light incidence reduction portion is disposed on the fourth surface when an overlap between the first wavelength band and the fourth wavelength band is equal to or larger than a predetermined wavelength band A. Optical components.

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