Optical member and imaging device

Abstract

An optical member and an imaging device each having a plurality of opening regions are provided. An optical member has a plurality of opening regions including a first opening region and a second opening region through which light rays of an optical system pass, the first opening region and the second opening region being adjacent to each other, the optical member having: a plurality of filters (144B, 144C) disposed in the first opening region and the second opening region and allowing at least a part of the light rays to pass therethrough with different wavelengths, respectively; a plurality of polarization filters (148B, 148C) disposed in the first opening region and the second opening region and having different polarization directions, respectively; and a light ray incidence reduction portion (W) that reduces incidence of the light rays (U) incident to the first opening region to at least one of the filter (144C) and the polarization filter (148C) disposed in the second opening region.

Description

Technical Field

[0001] This invention relates to an optical component and a camera device, and more particularly to an optical component and a camera device having multiple opening regions. Background Technology

[0002] There is a known technique for simultaneously acquiring multiple images with distinct image information using a single camera capture.

[0003] Patent Document 1 describes an imaging device comprising: a front optical system that allows light from an object to pass through; a spectral filter array that uses multiple spectral filters to allow light from the front optical system to pass through; a microlens array that allows light from the multiple spectral filters to pass through the multiple microlenses to image multiple object images; an imaging element that captures multiple object images; and an image processing unit that calculates two-dimensional spectral information of the object images based on image signals output from the imaging element. In the imaging device described in Patent Document 1, a separating member is disposed between the microlens array and the imaging element.

[0004] Previous technical documents

[0005] Patent documents

[0006] Patent Document 1: International Publication No. 2013 / 179620 Summary of the Invention

[0007] One embodiment of the present invention provides an optical component and a camera device having multiple opening regions.

[0008] means for solving technical problems

[0009] An optical component according to one aspect of the present invention includes a plurality of opening regions, including a first opening region and a second opening region, through which light from an optical system can pass, the first opening region and the second opening region being adjacent to each other. The optical component includes: a plurality of filters disposed in the first opening region and the second opening region, which allow light of at least a portion of different wavelength bands to pass through; a plurality of polarizing filters disposed in the first opening region and the second opening region, which have different polarization directions; and a light incident reduction section that reduces the amount of light incident on the first opening region that is incident on at least one of the filters and polarizing filters disposed in the second opening region.

[0010] Preferably, the light incident reduction portion is disposed at the boundary between the first opening region and the second opening region, and extends along the optical axis direction of the optical system.

[0011] Preferably, the light incident reduction section reflects the light.

[0012] Preferably, the light incident reduction section guides the reflected light to the object side of the optical system.

[0013] Preferably, the light incident reduction section is provided at the boundary between the first opening region and the second opening region, and is composed of a first light-shielding section and a second light-shielding section. The first light-shielding section extends along the optical axis of the optical system, and the second light-shielding section extends from the boundary in a direction along a plane perpendicular to the optical axis.

[0014] Preferably, the first light-shielding part is provided with an inclination that suppresses the reflection angle of the reflected light.

[0015] Preferably, the light incident reduction section 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.

[0016] Preferably, the light incident reduction section is disposed on the surface of the filter or polarizing filter on the object side.

[0017] Preferably, the light incident reduction section is disposed on the image-side surface of the filter or polarizing filter.

[0018] Preferably, the filter and the polarizing filter are arranged in close contact with each other.

[0019] Preferably, in the above-mentioned optical components, the filter and the polarizing filter are provided separately, and the light incident reduction part is provided between the filter and the polarizing filter, extending in a direction along a plane perpendicular to the optical axis of the optical system and / or the optical axis.

[0020] Preferably, in the first opening region, the filter has a first surface that allows the first band to pass through on the object side of the optical system and a second surface that allows the second band to pass through on the image side of the optical system; in the second opening region, a third surface that allows the third band to pass through on the object side of the optical system and a fourth surface that allows the fourth band to pass through on the image side of the optical system; and when the light incident reduction part is disposed on the fourth surface if the overlap between the first band and the fourth band is a predetermined band A or above.

[0021] As another aspect of the present invention, the imaging device includes: a lens device, wherein the optical components are disposed at or near a pupil position; a plurality of polarizers having polarization directions corresponding to the polarization directions of a plurality of polarizing filters; an imaging element including a plurality of pixel groups that selectively receive light passing through any one of a plurality of aperture regions; and a processor that generates a plurality of images corresponding to the wavelengths of the plurality of filters, respectively, based on a plurality of image signals output from the imaging element. Attached Figure Description

[0022] Figure 1 It is a diagram showing the general structure of a camera device.

[0023] Figure 2 This is a diagram showing the structure of the signal processing unit.

[0024] Figure 3 It is a diagram showing the general structure of the imaging element.

[0025] Figure 4 It means Figure 3 A cross-sectional view of a 1-pixel schematic structure is shown.

[0026] Figure 5 This is a three-dimensional view of the lens assembly.

[0027] Figure 6 It is a cross-sectional view along the optical axis L of the lens assembly.

[0028] Figure 7 This is an external view of the frame.

[0029] Figure 8 This is a diagram showing an example of the structure of an optical component.

[0030] Figure 9 This is a diagram illustrating the structure of the filter assembly.

[0031] Figure 10 It is a diagram showing the relationship between the opening area and the filter structure.

[0032] Figure 11 This diagram illustrates the situation where crosstalk occurs.

[0033] Figure 12 This is a diagram illustrating the light incident reduction unit W of the first embodiment.

[0034] Figure 13 This is a diagram illustrating another example of the first embodiment.

[0035] Figure 14 This is a conceptual diagram representing the frame.

[0036] Figure 15 This is a diagram illustrating another example of the first embodiment.

[0037] Figure 16 This is a diagram illustrating the light incident reduction section of the second embodiment.

[0038] Figure 17 This is a diagram illustrating another example of the second embodiment.

[0039] Figure 18 This is a diagram illustrating another example of the second embodiment.

[0040] Figure 19This is a diagram illustrating the light incident reduction unit W of the third embodiment.

[0041] Figure 20 This is a diagram illustrating another example of the third embodiment.

[0042] Figure 21 This is a diagram illustrating another example of the third embodiment.

[0043] Figure 22 This is a diagram illustrating the return angle of the return section.

[0044] Figure 23 This is a diagram illustrating the light incident reduction unit W of the fourth embodiment.

[0045] Figure 24 This is a diagram illustrating another example of the fourth embodiment.

[0046] Figure 25 This is a diagram illustrating another example of the fourth embodiment.

[0047] Figure 26 This is a diagram illustrating another example of the fourth embodiment.

[0048] Figure 27 This is a diagram illustrating the relationship between the height of the area boundary component and the height of the second shading part.

[0049] Figure 28 This is a diagram illustrating the light incident reduction unit W of the fifth embodiment.

[0050] Figure 29 This is a diagram illustrating another example of the fifth embodiment.

[0051] Figure 30 This is a diagram illustrating another example of the fifth embodiment.

[0052] Figure 31 This is a diagram illustrating the light incident reduction unit W of the sixth embodiment.

[0053] Figure 32 This is a diagram illustrating another example of the sixth embodiment.

[0054] Figure 33 This is a reference example illustrating the sixth embodiment.

[0055] Figure 34 This is a reference example illustrating the sixth embodiment.

[0056] Figure 35 This diagram illustrates the method for calculating the height of the region boundary component in the sixth embodiment.

[0057] Figure 36 This is a diagram illustrating the light incident reduction unit W in the seventh embodiment.

[0058] Figure 37 This is a diagram illustrating another example of the seventh embodiment.

[0059] Figure 38 This is a diagram illustrating another example of the seventh embodiment.

[0060] Figure 39 This is a diagram illustrating the relationship between the height of the region boundary component and that in the 7th embodiment.

[0061] Figure 40 This is a diagram illustrating the relationship between the height of the region boundary component and that in the 7th embodiment.

[0062] Figure 41 This is a diagram illustrating the light incident reduction unit W of the eighth embodiment. Detailed Implementation

[0063] Hereinafter, preferred embodiments of the optical components and imaging devices involved in the present invention will be described with reference to the accompanying drawings.

[0064] <Structure of the Camera Device>

[0065] Figure 1 This diagram shows a schematic structure of an imaging device with a lens assembly having optical components. The imaging device 10 is a multispectral camera (image capture device) 10 that captures multispectral images, and includes a lens assembly 100 and an imaging device main body 200. The imaging device main body 200 includes an imaging element 210 and a signal processing unit 230. The lens assembly 100 includes an optical system 100A composed of a first lens 110 and a second lens 120, and an optical component (wavelength polarizing filter unit) 130 disposed at or near the pupil position of the optical system 100A. Furthermore, 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.

[0066] <Structure of the image generation unit>

[0067] Figure 2This diagram illustrates the structure of the signal processing unit 230. The signal processing unit 230 includes an analog signal processing unit 232 that performs analog signal processing on the signal output from the imaging element 210, an image generation unit 234, and a coefficient storage unit 236. The image generation unit 234 (processor) includes a non-temporary recording medium (not shown) such as a ROM (Read Only Memory) containing computer-readable code that enables a computer to execute an imaging method, and a temporary storage area (not shown) for operation. Based on the multiple image signals (image signals corresponding to different polarization directions) output from the imaging element 210, it generates multiple images (spectral images) corresponding to the wavelengths of the multiple filters configured in the optical system 100A. The image generation unit 234 is capable of generating images in wavelengths λ1, λ2, and λ3 (multispectral images in three frequency bands).

[0068] The functions of the image generation unit 234 described above are implemented using various processors and recording media. These processors include, for example, general-purpose processors that execute software (programs) to implement various functions, such as CPUs (Central Processing Units); processors specialized for image processing, such as GPUs (Graphics Processing Units); and processors whose circuit structure can be changed after manufacturing, such as FPGAs (Field Programmable Gate Arrays), which are programmable logic devices (PLDs). Each function can be implemented by a single processor, or by multiple processors of the same or different types (e.g., multiple FPGAs, a combination of CPUs and FPGAs, or a combination of CPUs and GPUs). Furthermore, multiple functions can be implemented by a single processor. More specifically, the hardware structure of these various processors is a circuit composed of circuit elements such as semiconductor components.

[0069] When the aforementioned processor or circuit executes the software (program), the code that can be read by the computer executing the software (e.g., various processors or circuits constituting the image generation unit 234 and / or combinations thereof) is stored in a non-temporary recording medium such as ROM, and the computer refers to the software.

[0070] When the imaging device 10 receives a photography instruction input, such as a shutter release switch (not shown), it performs exposure control in the imaging element 210. The optical image of the subject, imaged 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. This signal is then stored in each pixel of the imaging element 210 and incident on the photodiode 212 (see reference 212). Figure 3The amount of light corresponding to the charge is read from the imaging element 210 and the electrical signal corresponding to the amount of charge stored in each pixel is used as an image signal and output.

[0071] <Structure of Imaging Elements>

[0072] Figure 3 This is a diagram showing a schematic structure of the imaging element 210. Figure 4 It means Figure 3 The diagram shows a cross-sectional view of a schematic structure for one pixel. Imaging element 210 is a CMOS (Complementary Metal-Oxide Semiconductor) type imaging element (image sensor), a monochrome imaging element having a pixel array layer 211, a polarizing filter element array layer 213, and a microlens array layer 215. The pixel array layer 211, the polarizing filter element array layer 213 (multiple polarizing elements), and the microlens array layer 215 are arranged sequentially from the image (plane) side towards the object side. Furthermore, imaging element 210 is not limited to CMOS type; it can also be an XY address type or a CCD (Charge Coupled Device) type image sensor.

[0073] The pixel array layer 211 is composed of multiple photodiodes 212 (multiple pixel groups) arranged in a two-dimensional pattern. One photodiode 212 constitutes one pixel. The photodiodes 212 are regularly arranged along the horizontal direction (x-direction) and the vertical direction (y-direction).

[0074] The polarizing filter element array layer 213 is constructed by arranging four types of polarizing filter elements (polarizers) 214A, 214B, 214C, and 214D (multiple polarizing elements) with different polarization directions (polarization directions of transmitted light) in a two-dimensional arrangement. The polarization directions of the polarizing filter elements 214A, 214B, 214C, and 214D can be set, for example, to 0°, 45°, 90°, and 135°. Furthermore, these polarization directions can be correlated with the polarizing filter 148 (reference) in the optical component 130. Figure 8 The polarization direction corresponds to that of the photodiode 212. The imaging element 210 includes multiple image groups, which selectively receive any one of the light transmitted through multiple opening regions via these polarization filter elements 214A to 214D. These polarization filter elements 214A to 214D are arranged at the same interval as the photodiode 212, per pixel.

[0075] The microlens array layer 215 has microlenses 216 arranged in each pixel.

[0076] <Structure of the Lens Device>

[0077] Figure 5This is a perspective view of the lens device 100. Figure 6 These are cross-sectional views of the lens assembly 100 along the optical axis L. As shown in these figures, the lens assembly 100 has a single imaging optical system composed of a first lens 110 and a second lens 120 arranged in the lens barrel 102. The first lens 110 and the second lens 120 may also be a lens group composed of multiple lenses. Furthermore, in the lens barrel 102, a slit 108 is formed at the pupil position (near the pupil) of the lens assembly 100, and an optical component 130 is inserted into the slit 108, arranged with its optical axis aligned with the optical axis L of the imaging optical system.

[0078] Figure 7 This is an external view of frame 132. Figure 8 This is a diagram showing a structural example of the optical component 130. Specifically, Figure 7 Parts (a) to (f) are respectively the rear view, top view, left side view, bottom view, perspective view, and front view. For example... Figure 7 As shown in parts (e) and (f), the frame 132 has four opening regions 132A to 132D. The shape of the opening regions 132A to 132D is not limited to a fan shape; it can also be circular, elongated, rectangular, polygonal, or other shapes. When acquiring three images (images of bands λ1, λ2, and λ3), since three opening regions are sufficient, the opening regions 132D are as follows: Figure 8 As shown, the light is blocked by the shielding member B. Furthermore, in this example, by shielding the opening region 132D with the shielding member B, the opening regions 132A to 132C are made effective, but this is not a limitation. For example, it is also possible to have a filter of the same wavelength band and a polarizing filter with the same polarization direction as any one of the opening regions 132A to 132C, without the shielding member B, in the opening region 132D.

[0079] Furthermore, in the three unshaded opening areas (132A~132C) (the back side of frame 132), such as Figure 8 As shown, filter groups 140A to 140C (ND (Neutral Density) filter, filter, optical path length correction filter, and polarizing filter) are respectively configured. Additionally, in Figure 8 The diagram shows filter groups 140A to 140C, each consisting of four filters. Furthermore, in each of filter groups 140A to 140C, the object-side filter (e.g., an ND filter) is positioned on the object-side surface of the frame 132, while the remaining three (e.g., a filter, a path length correction filter, and a polarizing filter) are positioned on the image-side surface of the frame 132. However, the arrangement of the filters and the position of the frame 132 between the filters are not limited to the example described above, and various methods can be employed.

[0080] Figure 9 This diagram illustrates the structure of filter groups 140A to 140C.

[0081] Filter group 140A consists of four different types of filters. From the object side, filter group 140A consists of an ND filter 142A, a filter 144A that allows light of wavelength λ1 to pass through, an optical path length correction filter 146A, and a polarizing filter 148A with a polarization direction of 0°. Similarly, from the object side, filter group 140B consists of an ND filter 142B, a filter 144B that allows light of wavelength λ2 to pass through, an optical path length correction filter 146B, and a polarizing filter 148B with a polarization direction of 60°. Similarly, from the object side, filter group 140C consists of an ND filter 142C, a filter 144C that allows light of wavelength λ3 to pass through, an optical path length correction filter 146C, and a polarizing filter 148C with a polarization direction of 120°. Furthermore, in this example, since three spectral images are acquired—one for band λ1, one for band λ2, and one for band λ3—the polarization directions of polarization filters 148A to 148C are different. For example, when acquiring two spectral images, at least two polarization filters with different polarization directions are used. Moreover, some bands of λ1, λ2, and λ3 are different.

[0082] Figure 10 It is a diagram showing the relationship between the opening area and the filter structure.

[0083] The optical component 130 has opening regions 132A to 132D formed by the frame 132. Specifically, region boundary components 132(α) of the frame 132 are disposed at the boundaries of opening regions 132A and 132D, and opening regions 132B and 132C, and region boundary components 132(β) are disposed at the boundaries of opening regions 132A and 132B, and opening regions 132C and 132D.

[0084] <Suppression of Crosstalk>

[0085] As described above, filter groups 140A to 140C are composed of a combination of multiple filters. Thus, when filter groups 140A to 140C are composed of multiple filters, the filter groups 140A to 140C themselves have thickness. When filter groups 140A to 140C themselves have thickness, light rays obliquely incident on each aperture region may pass through only the filters intended in the design. For example, light rays obliquely incident on aperture region 132A may also pass through the filter provided in aperture region 132B. In the following description, such a situation where light passes through adjacent aperture regions is referred to as crosstalk. When crosstalk occurs, it affects the image quality or spectral accuracy of the obtained image. In particular, when crosstalk light passes through filters that have a significant impact on image data (in the above example, filters and polarizing filters), the impact on image quality or spectral accuracy is significant. Specific examples of crosstalk occurring will be described below.

[0086] Figure 11 This diagram illustrates the situation where crosstalk occurs. Figure 11 (A) is a diagram showing the opening regions 132A to 132D formed by the frame 132. Figure 11 (B) is a cross-sectional view showing the filter groups 140B and 140C disposed in the opening regions 132B and 132C.

[0087] Aperture regions 132B and 132C are adjacent to each other. Aperture region 132B includes an ND filter 142B, a filter 144B, an optical path length correction filter 146B, and a polarizing filter 148B. Similarly, aperture region 132C includes an ND filter 142C, a filter 144C, an optical path length correction filter 146C, and a polarizing filter 148C.

[0088] A ray U incident obliquely into aperture region 132C first enters the ND filter 142C of aperture region 132C, and then enters the filter 144C. After exiting the filter 144C, the ray U passes through the filter 144B of aperture region 132B, the optical path length correction filter 146B, and the polarizing filter 148B. Thus, after passing through the filter 144C which allows light of wavelength λ3 to pass through, the ray U passes through the filter 144B which allows light of wavelength λ2 to pass through. As described above, after entering aperture region 132C, the ray U passes through the ND filter 142C, the filter 144C, the filter 144B, the optical path length correction filter 146B, and the polarizing filter 148B. Therefore, in this case, crosstalk occurs due to the ray U, which adversely affects the image quality or spectral accuracy of the obtained image.

[0089] Hereinafter, an imaging device 10 is proposed, which includes an optical component 130 capable of suppressing crosstalk caused by obliquely incident light rays U, and suppressing image quality degradation or adverse effects on spectral accuracy. Furthermore, in the following description, the suppression of crosstalk caused by obliquely incident light rays U will be explained, but it is also possible to suppress light rays other than light ray U (e.g., line-symmetrical light rays at the boundary BL).

[0090] <First Implementation>

[0091] The light incidence reduction section W of the first embodiment of the optical component 130 will be described. In this embodiment, the boundary section BL between the sides of the filter (refer to...) Figure 12 Set up a light incident reduction unit W.

[0092] Figure 12 This is a diagram illustrating the light incident reduction section W of this embodiment. Furthermore, in the following description, the boundary BL between opening regions 132B and 132C will be described, but the same light incident reduction section W is also provided between opening regions 132A and 132B.

[0093] A light incident 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 incident reduction section W is composed of a region boundary member 132(α) of the frame 132 and a wall member 202 extending from the region boundary member 132(α) towards the optical axis (the stacking direction of the filters) between the side surfaces of the filter group 140B and the filter group 140C. The wall member 202 extends integrally from the object-side end of the filter group 140B (140C) towards the image-side end. Furthermore, the region boundary member 132(α) and the wall member 202 can be integrally formed or separately formed. The light incident reduction section W prevents light U incident from the opening region 132C from entering the opening region 132B, thereby suppressing crosstalk. Here, "suppress" includes both prevention and reduction (the same applies in the following description).

[0094] Figure 13 This is a diagram illustrating another example of the first embodiment.

[0095] In this example, the light incidence reduction unit W is disposed in a portion of the boundary BL between the opening region 132B and the opening region 132C. The light incidence reduction unit W is composed of a region boundary member 132(α) of the frame 132 and a wall member 204 extending from the region boundary member 132(α) towards the optical axis between the side surfaces of the filter group 140B and the filter group 140C. The wall member 204 extends only from the region boundary member 132(α) towards the image side. The light incidence reduction unit W prevents or reduces the light U transmitted through the filter 144C from entering other opening regions. On the other hand, for example, there may be cases where light transmitted through the ND filter 142C enters the opening region 132B, but due to the nature of the ND filter, the crosstalk caused by such light has little impact on the image quality or spectral accuracy of the obtained image.

[0096] (For a 3x3 frame)

[0097] In the above description, a frame 132 with 2×2 opening regions 132A to 132D was described, but the application of this embodiment is not limited to this frame 132. For example, this embodiment can also be applied to a frame with 9 opening regions of 3×3.

[0098] Figure 14 This is a conceptual diagram showing a frame 932 that is mounted on the optical component 130 instead of a frame 132.

[0099] The frame 932 has 3×3 opening areas 932A to 932I. The frame 932 replaces the frame 132 and is disposed in... Figure 5 and Figure 6 The optical component 130 is shown. By using the frame 932, the imaging device 10 can acquire up to nine different image data. In addition, corresponding to the region boundary components 132(α) and 132(β) in the frame 132, region boundary components 932(α1), 932(α2), 932(β1) and 932(β2) are provided on the frame 932.

[0100] Figure 15 This is a diagram illustrating another example of the first embodiment. Furthermore, in the following description, the boundary portions BL of opening regions 932C, 932F, and 932I will be described, but the same light incidence reduction portion W is also provided in the boundary portions BL of other opening regions.

[0101] In this example, the light incident reduction unit W is provided in... Figure 14 On frame 932 as described in the text. In Figure 15 The diagram shows the opening regions 932C, 932F, and 932I of the frame 932.

[0102] In this example, the light incidence reduction section W 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. Furthermore, the light incidence reduction section W is composed of a region boundary member 932 (α1) of the frame 932 and a wall member 206 extending from the region boundary member 932 (α1) towards the optical axis between the side surfaces of the filter group 140B and the filter group 140C. Additionally, the light incidence reduction section W is composed of a region boundary member 932 (α2) of the frame 932 and a wall member 208 extending from the region boundary member 932 (α2) towards the optical axis between the side surfaces of the filter group 140B and the filter group 140C. Wall members 206 and 208 exist between the object-side end and the image-side end of the filter group. The light incident reduction section W can prevent light rays U incident from opening region 932F from entering opening region 932C, thereby suppressing crosstalk. Furthermore, the light incident reduction section W can prevent light rays U incident from opening region 932I from entering opening region 932F, thereby suppressing crosstalk.

[0103] <Second Implementation Method>

[0104] A second embodiment of the optical component 130 will be described. In this embodiment, a space (gap) is provided at the boundary portion BL as a light incident reduction portion W, so that the light ray U is totally reflected.

[0105] Figure 16 This is a diagram illustrating the light incident reduction unit W of the second embodiment. However, the following description will explain the case where the incident angle of light ray U satisfies the angle of total internal reflection.

[0106] A light incidence reduction section W is provided at the boundary BL between the opening regions 132B and 132C. Specifically, as the light incidence reduction section W, a space 302 is provided at the boundary BL from the object-side end of the filter group 140B and the filter group 140C to the image-side end. When the incident angle of light ray U meets a predetermined condition, this space 302 can cause total internal reflection of light ray U, preventing light ray U from entering the opening region 132B. Thus, when light ray U meets the predetermined condition, the space 302 causes total internal reflection of light ray U, preventing it from entering the opening region 132B, thereby suppressing the occurrence of crosstalk.

[0107] Figure 17 This is a diagram illustrating another example of the second embodiment.

[0108] In this example, the light incidence reduction unit W is provided at the boundary BL between the opening region 132B and the opening region 132C. Specifically, as the light incidence reduction unit W, a space 304 is provided at the boundary BL from the object-side end of the filter group 140B and the filter group 140C to the image-side end. In the space 304, from the lower end of the region boundary member 132(α) toward the boundary BL, the upper ends of the filter 144C, the optical path length correction filter 146C, and the polarizing filter 148C are inclined. Thus, by having an inclined space 304, it is easier to satisfy the condition that the light ray U is totally internally reflected. That is, by having an inclined space 304, the incident angle of the light ray U can be made shallower. Thus, when the light ray U meets the specified conditions, the space 304 causes the light ray U to be totally internally reflected, which can prevent it from being incident on the opening region 132B, thereby suppressing the occurrence of crosstalk.

[0109] (For a 3x3 frame)

[0110] For a 3x3 frame 932 (reference) Figure 14 An example of the light incident reduction unit W of the second embodiment will be described.

[0111] Figure 18 This is a diagram illustrating another example of the second embodiment.

[0112] A light incidence reduction section W is provided at the boundary BL between the aperture region 932C and the aperture region 932F. Furthermore, the light incidence reduction section W is also provided at the boundary BL between the aperture region 932F and the aperture region 932I. Specifically, as the light incidence reduction section W, spaces 306 and 308 are provided at the boundary BL from the object-side end to the image-side end of the filter assembly. When the incident angle of light ray U meets the specified conditions, spaces 306 and 308 can cause total internal reflection of light ray U, preventing it from incident on the aperture region other than the temporarily incident aperture region, thereby suppressing crosstalk.

[0113] <Third Implementation Method>

[0114] A third embodiment of the optical component 130 will be described. In this embodiment, as the light incident reduction part W, a reflective part is provided at the boundary part BL to guide the reflected light of the light ray U to the object side.

[0115] Figure 19 This is a diagram illustrating the light incident reduction unit W of the third embodiment.

[0116] The light incidence reduction unit W is provided with a return section 402 at the boundary BL between the opening regions 132B and 132C. Specifically, as the light incidence reduction unit W, a return section 402 inclined from the object side to the image side is provided at the boundary BL between the ND filters 142B and 142C, at the boundary BL between the filters 144B and 144C, at the boundary BL between the optical path length correction filters 146B and 146C, and at the boundary BL between the polarizing filters 148B and 148C. The return section 402 reflects the light ray U, further returning the reflected light ray U to the object side. The return section 402 can prevent the reflected light ray U from entering the opening region 132B, thereby suppressing crosstalk. Furthermore, by returning the reflected light ray U to the object side, the return section 402 can suppress the reflected light ray U from becoming stray light, thereby suppressing light spots and ghosting.

[0117] Figure 20 This is a diagram illustrating another example of the third embodiment.

[0118] The light incident reduction section W is provided with a return section 404 at the boundary BL between the opening regions 132B and 132C. Specifically, a return section 404 inclined from the object side to the image side is provided at the boundary BL between the ND filter 142B and filter 144B and the ND filter 142C and filter 144C. The return section 404 reflects the light ray U, further returning the reflected light ray U to the object side. In addition, as shown in the figure, a wall member is provided at the boundary BL of the optical path length correction filters 146B and 146C and the polarizing filters 148B and 148C, as described in the first embodiment. The return section 404 reflects the light U that passes through the ND filter 142C and the filter 144C and guides the reflected light to the object side. Therefore, it can prevent or reduce the light U from entering the opening area 132B, thereby suppressing the occurrence of crosstalk. In addition, it can prevent or reduce the reflected light U from becoming stray light, thereby suppressing light spots and ghosting.

[0119] (For a 3x3 frame)

[0120] For a 3x3 frame 932 (reference) Figure 14 An example of the light incident reduction unit W of the third embodiment will be described.

[0121] Figure 21 This is a diagram illustrating another example of the third embodiment.

[0122] The light incidence reduction unit W has a return section 406 at the boundary BL between the aperture region 932C and the aperture region 932F, and a return section 408 at the boundary BL between the aperture region 932F and the aperture region 932I. Specifically, as the light incidence reduction unit W, a return section 406 inclined from the object side to the image side is provided at the boundary BL between the ND filter 942C and the ND filter 942F, at the boundary BL between the filter 944C and the filter 944F, at the boundary BL between the optical path length correction filter 946C and the optical path length correction filter 946F, and at the boundary BL between the polarizing filter 948C and the polarizing filter 948F. Furthermore, as a light incidence reduction unit W, a return section 408 inclined from the object side to the image side is provided at the boundary BL between ND filters 942F and 942I, at the boundary BL between filters 944F and 944I, at the boundary BL between optical path length correction filters 946F and 946I, and at the boundary BL between polarizing filters 948F and 948I. The return sections 406 and 408 reflect the light ray U, preventing it from incident on areas other than the region where the light ray U is incident, thus suppressing crosstalk. Furthermore, by returning the reflected light of the light ray U to the object side, the return units 406 and 408 can suppress the reflected light of the light ray U from becoming stray light, thereby suppressing light spots and ghosting.

[0123] Figure 22 This is a diagram illustrating the return angle of the return unit 402.

[0124] When the angle of the return section 402 is set to α (rad), and the light ray U is reflected to the return section 402 at the light ray angle θ (rad), the following equation (1) needs to be satisfied in order for the reflected light to be reflected to the object side.

[0125] θ+2α-2ε>π / 2…(1)

[0126] Additionally, ε (rad) represents the slope of frame 132.

[0127] According to the above formula (1), the return angle α (rad) of the return unit 402 is expressed by the following formula (2).

[0128] α>π / 4-θ / 2+ε…(2)

[0129] Here, the ray angle θ (rad) represents the largest angle among the ray angles of the total image height passing through the center of frame 132. Furthermore, in the case of frame 932, it becomes the ray angle θ (rad) at the height of frame 932. The ray angle at the height of frame 932 represents the largest angle among the ray angles of the total image height passing through the height of frame 932. These are also the same in the following description.

[0130] <Fourth Implementation>

[0131] The fourth embodiment of the optical component 130 will be described. In this embodiment, the light incident reduction section W is composed of a first light-shielding section provided along the optical axis L at the boundary section BL and a second light-shielding section extending from the boundary section BL in a direction along a plane perpendicular to the optical axis L.

[0132] Figure 23 This is a diagram illustrating the light incident reduction unit W of the fourth embodiment.

[0133] The first light-shielding part 502 of the light incidence reduction section W is provided at the boundary BL between the opening region 132B and the opening region 132C. The first light-shielding part 502 is a wall member extending from the region boundary member 132(α) between the side surfaces of the filter group 140B and the filter group 140C in the direction of the optical axis L. The first light-shielding part 502 extends from the object-side end of the filter group to the image-side end. Furthermore, the second light-shielding part 504 of the light incidence reduction section W is provided on the image side of the filter group 140 from the boundary BL along a plane perpendicular to the optical axis L. For example, the second light-shielding part 504 is constructed by providing another frame identical to the frame 132 on the image side of the filter group 140. Thus, by means of the light incident reduction section W composed of the first light-shielding section 502 and the second light-shielding section 504, it is possible to prevent light U incident from the opening region 132C from entering the opening region 132B, suppress crosstalk, and suppress the occurrence of light spots and ghosting caused by the reflected light U reflected by the first light-shielding section 502.

[0134] Figure 24 This is a diagram illustrating another example of the fourth embodiment.

[0135] The light incident reduction section W is composed of a first light-shielding section 502 and a second light-shielding section 504. The height of the region boundary member 132(α) is formed to be higher than... Figure 23In the example described, the height of the second light-shielding part 504 is made relatively low. Thus, by forming the light incident reduction part W composed of the first light-shielding part 502 and the second light-shielding part 504, it is possible to prevent light rays U incident from the opening region 132C from entering the opening region 132B, suppressing crosstalk, and suppressing the occurrence of light spots and ghosting caused by reflected light U from the first light-shielding part 502. Furthermore, by appropriately adjusting the height of the second light-shielding part 504 according to the height of the region boundary member 132(α), the reduction in light intensity can be suppressed.

[0136] Figure 25 This is a diagram illustrating another example of the fourth embodiment.

[0137] The first light-shielding part 510 of the light incidence reduction section W is provided at the boundary BL between the opening regions 132B and 132C. Specifically, as the first light-shielding part 510, a space is provided at the boundary BL from the object-side end of the filter group 140B and the filter group 140C to the image-side end. When the incident angle of light U meets the predetermined conditions, the first light-shielding part 510 can totally reflect the light U. Furthermore, the second light-shielding part 512 of the light incidence reduction section W is provided on the image side of the filter group 140 from the boundary BL along a plane perpendicular to the optical axis L. Thus, by means of the light incidence reduction section W composed of the first light-shielding part 510 and the second light-shielding part 512, it is possible to prevent light U incident from the opening region 132C from entering the opening region 132B, suppress crosstalk, and suppress the occurrence of light spots and ghosting caused by the light U reflected by the first light-shielding part 510.

[0138] (For a 3x3 frame)

[0139] For a 3x3 frame 932 (reference) Figure 14 An example of the light incident reduction unit W of the fourth embodiment will be described.

[0140] Figure 26 This is a diagram illustrating another example of the fourth embodiment.

[0141] The first light-shielding part 514 of the light incidence reduction section W is provided at the boundary BL between the opening region 932C and the opening region 932F. Furthermore, the first light-shielding part 518 is provided at the boundary BL between the opening region 932F and the opening region 932I. The first light-shielding parts 514 and 518 are wall members extending along the optical axis L at the boundary BL. The wall members extend from the object-side end of the filter assembly to the image-side end. Furthermore, the second light-shielding parts 516 and 520 of the light incidence reduction section W are provided on the image side of the filter assembly 140 from the boundary BL along a plane perpendicular to the optical axis L. For example, the second light-shielding parts 516 and 520 are constructed by providing another frame identical to the frame 932 on the image side of the filter assembly. Thus, by using the light incident reduction section W composed of the first light-shielding section 514 and the second light-shielding section 516, and the light incident reduction section W composed of the first light-shielding section 518 and the second light-shielding section 520, it is possible to prevent light from entering the opening area other than the opening area into which it enters, suppress crosstalk, and suppress the occurrence of light spots and ghosting caused by the reflected light U of the light reflected by the first light-shielding section 514 (first light-shielding section 518).

[0142] Figure 27 This is a diagram illustrating the relationship between the height of the region boundary component 132(α) and the height of the second light-shielding part.

[0143] When the height of the region boundary component 132(α) is h1 and the height of the second light-shielding part 504 is h2, in order for the reflected light of the light ray U to be shielded by the second light-shielding part 504, the following conditions (3) and (4) need to be met.

[0144] h2>(dx)tan(θ+ε)…(3)

[0145] xtan(θ+ε)=h1…(4)

[0146] In addition, the light angle is set to θ (rad), the filter thickness of the region boundary component 132 (α) and the second light-shielding part 504 is set to d, and the tilt of the frame 132 is set to ε (rad).

[0147] When the equation for h2 is calculated according to the above equations (3) and (4), the following equation (5) is obtained.

[0148] h2>dtan(θ+ε)-h1…(5)

[0149] Furthermore, in the above formula, the light angle θ (rad) is the light angle at the height of the frame when the frame is 132 (2×2) and when the frame is 932 (3×3).

[0150] <Fifth Implementation>

[0151] A fifth embodiment of the optical component 130 will be described. In this embodiment, the light incident reduction section W is composed of a first light-shielding section disposed along the optical axis L at the boundary portion BL and a second light-shielding section extending from the boundary portion BL in a direction perpendicular to the optical axis L. Furthermore, the first light-shielding section is provided with an inclination to suppress the reflection angle of reflected light.

[0152] Figure 28 This is a diagram illustrating the light incident reduction unit W of the fifth embodiment.

[0153] The first light-shielding part 602 of the light incidence reduction section W is provided at the boundary BL between the opening region 132B and the opening region 132C. The first light-shielding part 602 extends from the region boundary member 132(α) in the space between the side surfaces of the filter group 140B and the filter group 140C in the direction of the optical axis L. Furthermore, the first light-shielding part 602 is inclined from the lower end of the region boundary member 132(α) toward the boundary BL to suppress the reflection angle of the reflected light U. Furthermore, the second light-shielding part 604 of the light incidence reduction section W is provided on the image side of the filter group 140 from the boundary BL along a plane perpendicular to the optical axis L. For example, the second light-shielding part 604 is constructed by providing another frame identical to the frame 132 on the image side of the filter group. Thus, by forming the light incident reduction section W, which consists of the first light-shielding section 602 and the second light-shielding section 604, it is possible to prevent light ray U incident from the opening region 132C from entering the opening region 132B, thereby suppressing crosstalk and preventing light spots and ghosting caused by reflected light U from the first light-shielding section 602. Furthermore, since the first light-shielding section 602 is inclined and suppresses the reflection angle of the reflected light, the height of the second light-shielding section 604 can be suppressed, thereby suppressing the reduction in light intensity.

[0154] Figure 29 This is a diagram illustrating another example of the fifth embodiment.

[0155] The first light-shielding part 606 of the light incidence reduction section W is provided at the boundary portion BL of the opening region 132B and the opening region 132C. The first light-shielding part 606 is composed of a space 606(a) and a wall member 606(b). The space 606(a) is a space extending towards the optical axis L between the side surfaces of the filter group 140B and the filter group 140C. Furthermore, the wall member 606(b) is inclined to suppress the reflection angle of the reflected light U. Specifically, the wall member 606(b) is inclined from the lower end of the region boundary member 132(a) towards the boundary portion BL. Furthermore, the second light-shielding part 608 of the light incidence reduction section W is provided on the image side of the filter group 140 from the boundary portion BL along a plane perpendicular to the optical axis L. Thus, by forming the light incident reduction section W, which consists of the first light-shielding section 606 and the second light-shielding section 608, it is possible to prevent light ray U incident from the opening region 132C from entering the opening region 132B, thereby suppressing crosstalk and preventing light spots and ghosting caused by reflected light ray U from the first light-shielding section 606. Furthermore, since the first light-shielding section 606 is inclined and suppresses the reflection angle of the reflected light, the height of the second light-shielding section 608 can be suppressed, thereby suppressing the reduction in light intensity.

[0156] (For a 3x3 frame)

[0157] For a 3x3 frame 932 (reference) Figure 14 An example of the light incident reduction unit W of the fifth embodiment will be described.

[0158] Figure 30 This is a diagram illustrating another example of the fifth embodiment.

[0159] The first light-shielding part 610 of the light incidence reduction part W is provided at the boundary BL between the opening region 932C and the opening region 932F. Furthermore, the first light-shielding part 614 of the light incidence reduction part W is provided at the boundary BL between the opening region 932F and the opening region 932I. The first light-shielding parts 610 and 614 are wall members extending from the region boundary member 932 (α1) between the side surfaces of the filter group 140B and the filter group 140C, towards the optical axis L. The first light-shielding parts 610 and 614 are inclined from the lower ends of the region boundary members 932 (α1) and 932 (α2) towards the boundary BL to suppress the reflection angle of the reflected light U. Furthermore, the second light-shielding parts 612 and 616 of the light incidence reduction part W are provided on the image side of the filter group 140 from the boundary BL along a plane perpendicular to the optical axis L. For example, the second light-shielding portions 612 and 616 are constructed by providing another frame identical to the frame 932 on the image side of the filter group. Thus, the light incidence reduction portion W, composed of the first light-shielding portions 610 and 614 and the second light-shielding portions 612 and 616, can prevent light from entering the opening area other than the temporarily incident opening area, suppressing crosstalk and suppressing the occurrence of light spots and ghosting caused by the reflected light U from the first light-shielding portions 610 and 614. Furthermore, since the first light-shielding portions 610 and 614 are inclined and suppress the reflection angle of the reflected light, the height of the second light-shielding portions 612 and 616 can be suppressed, thus suppressing the reduction in light intensity.

[0160] <Sixth Implementation>

[0161] A sixth embodiment of the optical component 130 will be described. In this embodiment, the light incident reduction unit W is composed of a region boundary component 132(α) with an appropriately set height.

[0162] Figure 31 This is a diagram illustrating the light incident reduction unit W of the sixth embodiment.

[0163] As a light incident reduction unit W, a region boundary member 132(α) with an appropriately set height is provided. The region boundary member 132(α) is provided on the object-side surface of the filters 144B and 144C. In this way, by appropriately setting the height of the region boundary member 132(α), light U passing through the filter 144C can be prevented or reduced from entering the opening region 132B, thereby suppressing the occurrence of crosstalk.

[0164] Figure 32 This is a diagram illustrating another example of the sixth embodiment. Figure 33 and Figure 34 This is a reference example illustrating the sixth embodiment.

[0165] exist Figure 32 In the example shown, filter group 140B is arranged in the order of optical path length correction filter 146B, ND filter 142B, filter 144B, and polarizing filter 148B. Filter group 140C also has filters arranged in the same order as filter group 140B. Filter 144B and polarizing filter 148B are disposed in close contact with each other, and filter 144C and polarizing filter 148C are disposed in close contact with each other. Here, "close contact" means that the filters are pressed against each other; even when the region boundary member 132(α) is disposed between the filters, the situation of the filters being pressed against each other is also referred to as "pressed against each other." The light contrast transmitted through filters 144B and 144C, and polarizing filters 148B and 148C, significantly affects the image quality and spectral accuracy of the obtained image. Therefore, the region boundary member 132(α) with an appropriately set height is disposed between filters 144B and 144C and polarizing filters 148B and 148C to suppress crosstalk between filters 144B and 144C and polarizing filters 148B and 148C. Thus, by appropriately setting the height of the region boundary member 132(α) and disposing it between filters 144B and 144C and polarizing filters 148B and 148C, light U passing through filter 144C can be prevented or reduced from incident on the opening region 132B, thereby suppressing crosstalk.

[0166] exist Figure 33 In the example shown, in filter group 140B, an optical path length correction filter 146B, a filter 144B, an ND filter 142B, and a polarizing filter 148B are arranged in sequence. Filter group 140C also has filters arranged in the same order as filter group 140B. A region boundary member 132(α) is disposed between the ND filter 142B (142C) and the polarizing filter 148B (148C). This prevents or reduces the occurrence of crosstalk by preventing or reducing light ray U from entering the polarizing filter 148C after passing through the ND filter 142B, or light ray U from entering the polarizing filter 148B after passing through the ND filter 142C.

[0167] exist Figure 34In the example shown, filter group 140B contains an ND filter 142B, a filter 144B, an optical path length correction filter 146B, and a polarizing filter 148B arranged sequentially. Similarly, filter group 140C contains an ND filter 142C, a filter 144C, an optical path length correction filter 146C, and a polarizing filter 148C arranged sequentially. In this case, the region boundary member 132(α) is positioned between the optical path length correction filter 146B (146C) and the polarizing filter 148B (148C). This prevents or reduces the occurrence of crosstalk by preventing or reducing light ray U from entering the polarizing filter 148B after passing through the optical path length correction filter 146C, or by preventing light ray U from entering the polarizing filter 148C after passing through the optical path length correction filter 146B.

[0168] Figure 35 This diagram illustrates the method for calculating the height of the region boundary component 132(α) in the sixth embodiment.

[0169] exist Figure 35 In the example shown, the filter group consists of filters FA1 to FA3 and filters FB1 to FB4. Filters FA1 to FA3 are arranged from the region boundary member 132(a) toward the object side, and filters FB1 to FB4 are arranged from the region boundary member 132(a) toward the image side.

[0170] In the following description, we consider the case of suppressing crosstalk between (filter FA1) and (filters FB1 and FB2). The filter thickness closer to the object side than the region boundary member 132(α) corresponds to filter FA1 as dfl. And, the filter thickness closer to the image side than the region boundary member 132(α) corresponds to filters FB1 and FB2 as dr1+dr2. In this case, when the set height of the region boundary member 132(α) is h, h is set to satisfy the condition of the following equation (6).

[0171] h>dtan(θ+ε)…(6)

[0172] In addition, as shown in equation (7), d is the larger of dfl and drl+dr2.

[0173] [Formula 1]

[0174]

[0175] Furthermore, in the above formula, the light angle θ (rad), the skewness ε (rad) of the frame 132, and the filters 1~m and 1~n that do not mix the light are represented.

[0176] Furthermore, in the above formula, the light angle θ (rad) is the light angle at the height of the frame when the frame is 132 (2×2) and when the frame is 932 (3×3).

[0177] <Seventh Implementation>

[0178] A seventh embodiment of the optical component 130 will be described. In this embodiment, the light incident reduction section W is composed of a plurality of region boundary components 132(α), which are disposed between the regions where the filters 144B and 144C are separately disposed from the polarizing filters 148B and 148C.

[0179] Figure 36 This is a diagram illustrating the light incident reduction unit W in the seventh embodiment.

[0180] The light incident reduction section W consists of two region boundary members 132(α1) and 132(α2) disposed on the boundary section BL. Region boundary member 132(α1) is disposed between ND filters 142B and 142C and filters 144B and 144C. Furthermore, region boundary member 132(α2) is disposed between filters 144B and 144C and polarizing filters 148B and 148C. This prevents or reduces the amount of light U that passes through filter 144C and then enters polarizing filter 148B, thereby suppressing crosstalk. The heights of region boundary members 132(α1) and 132(α2) are set according to the skewness, axis offset, and spacing of each filter (details will be explained later).

[0181] Figure 37 This is a diagram illustrating another example of the seventh embodiment.

[0182] The light incident reduction section W is composed of four region boundary members 132(α1) to 132(α4) disposed on the boundary section BL. Region boundary member 132(α1) is disposed on the object-side surface of the optical path length correction filters 146B and 146C. Region boundary member 132(α2) is disposed on the object-side surface of the ND filters 142B and 142C. Region boundary member 132(α3) is disposed on the object-side surface of the filters 144B and 144C. Region boundary member 132(α4) is disposed on the object-side surface of the polarizing filters 148B and 148C. This prevents or reduces the incidence of light U from the opening region 132C into the opening region 132B, thereby suppressing crosstalk. In addition, the height of the region boundary components 132(α1) to 132(α4) is set according to the skewness, axial offset, and spacing of each filter (details will be explained later).

[0183] (For a 3x3 frame)

[0184] For a 3x3 frame 932 (reference) Figure 14 An example of the light incident reduction unit W of the seventh embodiment will be described.

[0185] Figure 38 This is a diagram illustrating another example of the seventh embodiment.

[0186] The light incident reduction section W is composed of eight region boundary members 932(α1) to 932(α8). These eight region boundary members 932(α1) to 932(α8) are arranged in groups of two at the object-side boundary portion BL of each filter. Specifically, region boundary members 932(α1) and 932(α2) are provided at the boundary portions BL of each ND filter (942C, 942F, 942I). Furthermore, region boundary members 932(α3) and 932(α4) are provided at the boundary portions BL of each filter (944C, 944F, 944I). Finally, region boundary members 932(α5) and 932(α6) are provided at the boundary portions BL of each optical path length correction filter (946C, 946F, 946I). Furthermore, region boundary components 932 (α7) and 932 (α8) are provided at the boundary portions BL of the polarizing filters (948C, 948F, 948I). This prevents or reduces obliquely incident light rays U (in... Figure 38 (Illustration omitted) The incident light is directed to the region other than the temporarily incident opening region, thereby suppressing crosstalk.

[0187] Furthermore, in the above example, the light incident reduction section W is composed of multiple region boundary members 132(α), but this embodiment is not limited to this. For example, as described in the first embodiment above, the light incident reduction section W may also be composed of a wall member provided along the optical axis L at the boundary section BL. Moreover, as described in the first embodiment above, the light incident reduction section W may also be composed of a combination of a wall member provided along the optical axis L at the boundary section BL and the region boundary members 132(α) described in this embodiment.

[0188] Figure 39 and Figure 40 This is a diagram illustrating the relationship between the height of the region boundary component and that in the 7th embodiment.

[0189] like Figure 39 As shown, when the height hi of the region boundary component 132(α1) is set by the region boundary component 132(α1) so that the light ray U does not cross the boundary part BL, the following equation (8) needs to be satisfied.

[0190] [Formula 2]

[0191] h i >d imax tan(θ+∈ i )…(8)

[0192] [Formula 3]

[0193] d imax =max(df i dr j )…(9)

[0194] In addition, the values ​​in the above formula are as follows.

[0195] Light angle θ (rad)

[0196] The slope εi (rad) of the frame 132 of the region boundary component 132(α1).

[0197] The thickness dfi of the filter closer to the object side than the region boundary component 132 (α1)

[0198] The thickness of the filter dri, which is closer to the image side than the region boundary component 132 (α1)

[0199] like Figure 40 As shown, when the light ray U intersects with the boundary part BL and is blocked by the region boundary member 132 (α2), the height hi of the region boundary member 132 (α1) and the height hi+1 of the region boundary member 132 (α2) need to satisfy the following formula (10).

[0200] [Formula 4]

[0201]

[0202] In addition, the values ​​in the above formula are as follows.

[0203] Light angle θ (rad)

[0204] The slope εi (rad) of the frame 132 of the region boundary component 132(a1).

[0205] The slope εi+1 (rad) of the frame 132 of the region boundary component 132(α2).

[0206] The distance Di between region boundary component 132(α1) and region boundary component 132(α2)

[0207] The axial offset xi (rad) of the frame 132 of the region boundary component 132 (α1).

[0208] The axial offset xi+1 (rad) of the frame 132 of the region boundary component 132 (α2).

[0209] As explained above, in this embodiment, the heights of the region boundary component 132(α1) and the region boundary component 132(α2) are set to satisfy equation (8) or equation (10).

[0210] <Eighth Implementation>

[0211] The eighth embodiment of the optical component 130 will be described. In this embodiment, the light incident reduction part W is provided in a filter, which has a surface that allows different wavelengths to pass through the object-side surface and the image-side surface.

[0212] Figure 41 This is a diagram illustrating the light incident reduction unit W of the eighth embodiment.

[0213] 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 band) of surface 820(W1) are shown in Figure 802, and the wavelength transmission characteristics (second band) of surface 820(W3) are shown in Figure 806. Furthermore, 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 band) of surface 820(W2) are shown in Figure 804, and the wavelength transmission characteristics (fourth band) of surface 820(W4) are shown in Figure 808. As shown in Figures 802-808, in the filter 144(W), the object-side surfaces 820(W1) and 820(W2) have cut-out surfaces on the short wavelength side, and the image-side surfaces 820(W3) and 820(W4) have cut-out surfaces on the long wavelength side. Furthermore, Figures 810-816 show the wavelength characteristics of the light rays V1-V4 passing through the filter 144(W). Light ray V1 is obliquely incident; as shown in Figure 810, since its wavelength is cut off throughout the entire region, it is blocked on surfaces 820(W2) and 820(W3). As shown in Figure 812, light ray V2 passes through surfaces 820(W1) and 820(W3) with a predetermined wavelength band a1. As shown in Figure 814, light ray V3 passes through surfaces 820(W2) and 820(W4) with a predetermined wavelength band a2. Furthermore, bands a1 and a2 are the wavelengths of light desired by the designer. Ray V4 is obliquely incident light, as shown in Figure 816, passing through light with band A. However, due to design flaws, band A does not have a suitable cutoff wavelength. Therefore, a region boundary member 132(α) is provided to block ray V4. Specifically, the region boundary member 132(α) is provided near the boundary portion BL of surface 820(W4). This allows ray V4 to be appropriately repelled. Furthermore, by providing the region boundary member 132(α), the opening area is reduced, but it is possible to change the object side and image side of the filter 144(W) to be reversed, or to place the region boundary member 132(α) on either the object side or image side of the filter 144(W).

[0214] The above description illustrates examples of the present invention, but the present invention is not limited to the above embodiments. Various modifications can be made without departing from the spirit of the present invention.

[0215] Symbol Explanation

[0216] 10-Image capturing device, 100-Lens assembly, 100A-Optical system, 102-Lens barrel, 108-Slit, 110-First lens, 120-Second lens, 130-Optical component, 132-Frame, 132A-Aperture area, 132B-Aperture area, 132C-Aperture area, 132D-Aperture area, 140-Filter group, 140A-Filter group, 140B-Filter group, 140C-Filter group, 142A-ND filter, 142B-ND filter, 142C-ND filter, 144A-Filter, 144B-Filter, 144C-Filter, 146A-Optical path length correction filter, 146B-Optical path length correction filter. Path length correction filter, 146C - Path length correction filter, 148A - Polarizing filter, 148B - Polarizing filter, 148C - Polarizing filter, 200 - Camera device body, 210 - Imaging element, 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 unit, 232 - Analog signal processing unit, 234 - Image generation unit, 236 - Coefficient storage unit, L - Optical axis, U - Ray.

Claims

1. An optical component having a plurality of opening regions, including a first opening region and a second opening region, through which light from an optical system can pass. The first opening region and the second opening region are adjacent to each other. The optical component includes: Multiple filters are disposed in the first opening region and the second opening region, and allow light of at least a portion of different wavelengths to pass through; Multiple polarizing filters are disposed in the first opening region and the second opening region, and their polarization directions are different from each other; and A space is provided at the boundary between the first opening region and the second opening region, and extends along the optical axis of the optical system, so that at least a portion of the obliquely incident light rays are totally internally reflected. The space is tilted along the optical axis of the optical system, which reduces the incident angle of obliquely incident light rays.

2. An optical component having a plurality of opening regions, including a first opening region and a second opening region, through which light from an optical system can pass. The first opening region and the second opening region are adjacent to each other. The optical component includes: Multiple filters are disposed in the first opening region and the second opening region, and allow light of at least a portion of different wavelengths to pass through; Multiple polarizing filters are disposed in the first opening region and the second opening region, and their polarization directions are different from each other; and The return section is located at the boundary between the first opening region and the second opening region, and is inclined from the object side to the image side along the optical axis of the optical system, so that obliquely incident light rays are reflected to the object side.

3. The optical component according to claim 2, wherein, The optical system has a plurality of return sections along its optical axis.

4. The optical component according to claim 3, wherein, Each filter is equipped with the aforementioned return section.

5. The optical component according to any one of claims 2 to 4, wherein, The optical component further includes a wall component disposed at the boundary between the first opening region and the second opening region, and extending along the optical axis of the optical system.

6. An optical component having a plurality of opening regions, including a first opening region and a second opening region, through which light from an optical system can pass. The first opening region and the second opening region are adjacent to each other. The optical component includes: Multiple filters are disposed in the first opening region and the second opening region, and allow light of at least a portion of different wavelengths to pass through; Multiple polarizing filters are disposed in the first opening region and the second opening region, and their polarization directions are different from each other; and The light incident reduction section reduces the amount of light incident on the first opening region that is directed to at least one of the filter and the polarizing filter disposed in the second opening region. in, The light incident reduction section is composed of a first light-shielding section and a second light-shielding section. The first light-shielding section is disposed at the boundary between the first opening region and the second opening region and extends along the optical axis of the optical system. The second light-shielding section is configured to be closer to the image side than the filter and the polarizing filter, and extends from the boundary in a direction along a plane perpendicular to the optical axis.

7. The optical component according to claim 6, wherein, The first light-shielding part has a wall component extending along the optical axis of the optical system.

8. The optical component according to claim 7, wherein, The wall component is tilted along the optical axis of the optical system, which reduces the incident angle of obliquely incident light.

9. The optical component according to claim 7 or 8, wherein, The first light-shielding portion is configured to be closer to the object side than the filter and the polarizing filter, and also has a region boundary member extending in a direction along a plane perpendicular to the optical axis.

10. The optical component according to claim 6, wherein, The first light-shielding portion has a space that extends along the optical axis of the optical system and causes at least a portion of obliquely incident light rays to be totally internally reflected.

11. The optical component according to claim 10, wherein, The space is tilted along the optical axis of the optical system, which reduces the incident angle of obliquely incident light rays.

12. The optical component according to claim 10 or 11, wherein, The first light-shielding portion is configured to be closer to the object side than the filter and the polarizing filter, and also has a region boundary member extending in a direction along a plane perpendicular to the optical axis.

13. The optical component according to any one of claims 6 to 8, wherein, The second light-shielding part is set to a height capable of blocking reflected light that is obliquely incident and reflected by the first light-shielding part.

14. An optical component having a plurality of opening regions, including a first opening region and a second opening region, through which light from an optical system can pass. The first opening region and the second opening region are adjacent to each other. The optical component includes: Multiple filters are disposed in the first opening region and the second opening region, and allow light of at least a portion of different wavelengths to pass through; Multiple polarizing filters are disposed in the first opening region and the second opening region, and their polarization directions are different from each other; and A region boundary component is disposed at the boundary between the first opening region and the second opening region, and extends in a direction perpendicular to a plane intersecting the optical axis of the optical system. The region boundary component has a height along the plane that prevents light incident on the first opening region from entering the filter and the polarizing filter disposed in the second opening region. in, When the larger of the sum of the thicknesses of filters configured to be closer to the object side than the region boundary member and the sum of the thicknesses of filters configured to be closer to the image side than the region boundary member is set as d, the ray angle is set as θ, and the slope of the frame of the first opening region and the second opening region is set as ε, the height h of the region boundary member satisfies the following formula: h>dtan(θ+ε).

15. The optical component according to claim 14, wherein, The region boundary component is configured to be closer to the object side than the filter and the polarizing filter.

16. The optical component according to claim 15, wherein, The optical component also includes a plurality of optical path length correction filters disposed in the first opening region and the second opening region. In the first opening region and the second opening region, the optical path length correction filter is disposed between the filter and the polarizing filter.

17. The optical component according to claim 14, wherein, The filter and the polarizing filter are disposed in close contact with each other. The region boundary component is disposed between the filter and the polarizing filter.

18. The optical component according to claim 14, wherein, The optical component also includes a plurality of ND filters disposed in the first opening region and the second opening region. In the first and second opening regions, the filter, the ND filter, and the polarizing filter are arranged in the order of the object side, and the filter, the ND filter, and the polarizing filter are disposed in close contact with each other. The region boundary component is disposed between the ND filter and the polarizing filter.

19. The optical component according to claim 14, wherein, The optical component also includes a plurality of optical path length correction filters disposed in the first opening region and the second opening region. In the first and second opening regions, the filter, the optical path length correction filter, and the polarizing filter are arranged in the order of the object side, and the filter, the optical path length correction filter, and the polarizing filter are disposed in close contact with each other. The region boundary component is disposed between the optical path length correction filter and the polarization filter.

20. An optical component having a plurality of opening regions, including a first opening region and a second opening region, through which light from an optical system can pass. The first opening region and the second opening region are adjacent to each other. The optical component includes: Multiple filters are disposed in the first opening region and the second opening region, and allow light of at least a portion of different wavelengths to pass through; Multiple polarizing filters are disposed in the first opening region and the second opening region, and their polarization directions are different from each other; and Multiple region boundary components are disposed at the boundary between the first opening region and the second opening region, and are disposed at multiple locations along the optical axis of the optical system, extending in a direction along a plane perpendicular to the optical axis.

21. The optical component according to claim 20, wherein, One of the plurality of said region boundary components is disposed between the filter and the polarizing filter.

22. The optical component according to claim 20, wherein, The region boundary component is disposed on the object-side surface of each filter.

23. The optical component according to any one of claims 20 to 22, wherein, The region boundary component is set to a height at which light rays passing through the region boundary component do not cross the boundary portion.

24. An optical component having a plurality of opening regions, including a first opening region and a second opening region, through which light from an optical system can pass. The first opening region and the second opening region are adjacent to each other. The optical component includes: Multiple filters are disposed in the first opening region and the second opening region, and allow light of at least a portion of different wavelengths to pass through; Multiple polarizing filters are disposed in the first opening region and the second opening region, and their polarization directions are different from each other; and The light incident reduction section reduces the amount of light incident on the first opening region that is directed to at least one of the filter and the polarizing filter disposed in the second opening region. The filter has a first surface that allows a first wavelength band to pass through on the object side of the optical system and a second surface that allows a second wavelength band to pass through on the image side of the optical system in the first opening region. In the second opening region, a third surface that allows a third wavelength band to pass through is provided on the object side of the optical system, and a fourth surface that allows a fourth wavelength band to pass through is provided on the image side of the optical system. The light incident reduction section is disposed on the fourth surface when the overlap between the first band and the fourth band is a predetermined band A or above.

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