Shooting equipment

Abstract

The present invention provides a high-resolution, high-optical-performance, and compact imaging device. A camera module (10) as an imaging device mounted on an optical device such as a camera (60) comprises: an optical system (UL) comprising a main reflector (12) as a first reflector and a sub-reflector (13) as a second reflector to form an image of an object, wherein the main reflector (12) reflects incident light a predetermined number of times, and the sub-reflector (13) reflects light reflected by the first reflector a predetermined number of times; an imaging element (14) arranged on the image side relative to the optical system (UL) to capture the image of the object formed by the optical system (UL); and a prevention section (19) to prevent light other than the predetermined number of reflections by the first reflector and the second reflector from being incident on the imaging element.

Description

Technical Field

[0001] The invention relates to a photographing device. Background Art

[0002] Conventionally, there is disclosed an imaging device that uses a reflective optical system to achieve miniaturization (see, for example, Patent Document 1). However, there is a demand for further improvement in optical performance.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-109673 Summary of the invention

[0006] The first embodiment of the imaging device of the present invention comprises: an optical system including a first reflecting portion and a second reflecting portion to form an image of an object, wherein the first reflecting portion reflects incident light a predetermined number of times, and the second reflecting portion reflects light reflected by the first reflecting portion a predetermined number of times; an imaging element arranged on the image side relative to the optical system to photograph the image of the object formed by the optical system; and a preventing portion to prevent light other than the predetermined number of reflections by the first reflecting portion and the second reflecting portion from being incident on the imaging element.

[0007] A second embodiment of the camera device of the present invention comprises: an optical system having a first reflecting portion that reflects incident light and a second reflecting portion for incident light reflected by the first reflecting portion and reflecting the light; a camera element that is arranged on the image side relative to the optical system and for incident light reflected by the second reflecting portion, so as to photograph an image of an object formed by the optical system; and a light-shielding component that is arranged on at least one of the optical axis side of the optical system for the light reflected by the first reflecting portion and the side of the light reflected by the second reflecting portion that is opposite to the optical axis of the optical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 1 and 2 are explanatory diagrams showing a camera module, wherein (a) is a front view and (b) is a cross-sectional view.

[0009] Figure 2 2 are cross-sectional views of an optical system constituting a camera module, wherein (a) shows a basic structure of a Schmidt-Cassegrain method, and (b) shows a structure in which a lens is added to (a).

[0010] Figure 3 Graphs showing the relationship between the secondary zoom ratio and astigmatism in Schmidt-Cassegrain and Cassegrain optical systems.

[0011] Figure 4 1 is a perspective view showing the appearance of a camera module having a multi-eye structure.

[0012] Figure 5 1 and 2 are explanatory diagrams showing a camera module having a multi-eye structure, wherein (a) is a front view and (b) is an AA cross-sectional view of (a).

[0013] Figure 6 It is an explanatory diagram showing the structure of the first optical component and the second optical component.

[0014] Figure 7 It is an explanatory diagram showing the structure of an optical system block.

[0015] Figure 8 This is an explanatory diagram for explaining the focusing mechanism.

[0016] Fig. 9 1 and 12 are explanatory diagrams for explaining the field of view of the camera module, wherein (a) shows a telephoto end state and (b) shows a wide-angle end state.

[0017] Fig.10 These are explanatory diagrams for explaining a zoom mechanism, wherein (a) shows a side view and (b) shows a zoom method.

[0018] Fig.11 It is an explanatory diagram showing the movement direction of the field of view of each optical system when the magnification is changed from the telephoto end state to the wide-angle end state.

[0019] Fig.12 These are explanatory diagrams for explaining removal of stray light, wherein (a) shows an example of stray light, and (b) shows a first structure.

[0020] Fig.13 It is an explanatory diagram showing a second structure for removing stray light.

[0021] Fig.14 It is an explanatory diagram for explaining the setting of the position of the imaging element in the optical axis direction for each unit block.

[0022] Fig.15 This is an explanatory diagram for explaining the combination with a lighting device.

[0023] Fig.16 It is an explanatory diagram showing the arrangement pattern of cameras and lighting devices.

[0024] Fig.17 The diagrams are explanatory diagrams of a multi-stage folding structure, wherein (a) shows a case where each reflector is constructed by a separate component, and (b) shows a case where each of the main reflector and the sub-reflector is constructed by one component.

[0025] Fig.18 is a schematic diagram of a camera having a camera module.

[0026] Fig.19is a flowchart illustrating a method of manufacturing a camera module.

[0027] Fig. 20 It is a cross-sectional view showing the lens structure of the optical system according to the first embodiment.

[0028] Fig.21 1 and 2 are diagrams showing various aberrations of the optical system of the first embodiment.

[0029] Fig. 22 It is a cross-sectional view showing the lens structure of the optical system according to the second embodiment.

[0030] Fig.23 1 and 10 are diagrams showing various aberrations of the optical system of the second embodiment.

[0031] Fig.24 It is a cross-sectional view showing the lens structure of the optical system of the third embodiment.

[0032] Fig.25 These are various aberration diagrams of the optical system of the third embodiment.

[0033] Fig.26 It is a cross-sectional view showing the lens structure of the optical system of the fourth embodiment.

[0034] Fig. 27 These are various aberration diagrams of the optical system of the fourth embodiment.

[0035] Fig.28 It is an explanatory diagram showing the structure of the optical system of the fifth embodiment to the seventh embodiment.

[0036] Fig.29 This is a cross-sectional view of an optical system formed by an integrated lens.

[0037] Fig.30 It is an explanatory diagram showing the structure of the optical system of the eighth embodiment.

[0038] Fig.31 These are various aberration diagrams of the optical system of Example 8.

[0039] Fig.32 It is an explanatory diagram showing the structure of the optical system of the ninth embodiment.

[0040] Fig.33 These are various aberration diagrams of the optical system of Example 9.

[0041] Fig.34 It is an explanatory diagram showing the structure of the optical system of the tenth embodiment.

[0042] Fig.35 These are various aberration diagrams of the optical system of Example 10. DETAILED DESCRIPTION

[0043] Hereinafter, preferred embodiments will be described with reference to the drawings.

[0044] (Structure of Camera Module 10)

[0045] like Figure 1 As shown, the camera module 10 as the imaging device of this embodiment is composed of an optical system UL and an imaging element 14 . Light from the object side is formed into an image by the optical system UL, and the imaging element 14 captures the subject image.

[0046] like Figure 2As shown in (a), the optical system UL is a so-called Schmidt-Cassegrain system (or a compact Schmidt-Cassegrain system), and includes, in order from the object (subject) side along the optical axis: a correction plate 11 as a correction component, having a correction surface 11a as a high-order aspheric surface, through which light from the object is transmitted; a main reflector 12 as a first reflection part, with a concave reflection surface (first reflection surface 12a) facing the object side, reflecting the light transmitted through the correction plate 11; and a sub-reflector 13 as a second reflection part, arranged on the object side in a manner opposite to the main reflector 12, with a convex reflection surface (second reflection surface 13a) facing the image side (main reflector 12 side), reflecting the light reflected by the main reflector 12. Here, the optical axis of the light incident on the first reflection surface 12a coincides with the optical axis of the light reflected by the first reflection surface 12a. In addition, the optical axis of the light incident on the second reflection surface 13a coincides with the optical axis of the light reflected by the second reflection surface 13a. In addition, an opening 12b is formed in the center of the main reflector 12 in such a manner as to include the optical axis of the optical system UL, and the light reflected by the sub-reflector 13 passes through the opening 12b. That is, the first reflection surface 12a has the opening 12b provided in such a manner as to include the optical axis of the light incident on the first reflection surface 12a, and the second reflection surface 13a reflects the light toward the opening 12b. An imaging element 14 is arranged on the image side of the main reflector 12 in such a manner as to be opposite to the opening 12b. In addition, the main reflector 12 and the sub-reflector 13 are configured to focus the light from the object, and the optical system UL is configured such that the imaging element 14 is located at the focal point (the focal point of the optical system UL) of the main reflector 12 and the sub-reflector 13 (arranged in such a manner that the imaging surface of the imaging element 14 is substantially consistent with the image surface I of the optical system UL). As described above, the optical axis of the optical system UL is bent after passing through the correction plate 11 from the object side, and is reflected by the main reflector 12, and is further bent by the sub-reflector 13. In addition, the main reflector 12 (first reflective surface 12a) as the first reflector 12 may be in the shape of a ring centered on the optical axis, or in the shape of a rectangular shape centered on the optical axis with a rectangular or circular opening 12b. In addition, the secondary reflector 13 (second reflective surface 13a) as the second reflector 13 may also be in the shape of a circle or rectangle centered on the optical axis.

[0047] In addition, about Figure 2The optical system UL shown in (a) shows a case where the surface on the object side of the correction plate 11 is the correction surface 11a, but the surface on the image side may be the correction surface 11a. Regarding the correction surface 11a, it is preferred that when the aberration is deteriorated due to the reflection surface (the first reflection surface 12a and the second reflection surface 13a), the aberration is corrected, and the aberration of the type that cannot be completely corrected by the reflection surface and the high-order aberration that cannot be completely corrected by the reflection surface may be corrected. Although the correction surface 11a is preferably a high-order aspheric surface, it can be a spherical surface or an aspheric surface rather than a plane. In addition, although the surface of the correction plate 11 on which the correction surface 11a is not formed is a plane in the present embodiment, it may be a spherical surface or a free-form surface.

[0048] (Optical System UL)

[0049] The optical system UL is constituted by a reflective optical system as described above. Here, even if at least one or both of the first reflecting surface 12a of the main reflecting mirror 12 and the second reflecting surface 13a of the sub-reflecting mirror 13 are constituted by spherical surfaces, the aberrations generated by the main reflecting mirror 12 and the sub-reflecting mirror 13 can be corrected by the surface on the object side of the correction plate 11, that is, the high-order aspherical surface (for example, the fourth-order curved surface), so that an image without coma, astigmatism, and distortion can be obtained as a whole. Therefore, at least one of the first reflecting surface 12a of the main reflecting mirror 12 and the second reflecting surface 13a of the sub-reflecting mirror 13 is preferably a spherical surface, and more preferably, both the first reflecting surface 12a and the second reflecting surface 13a are spherical surfaces. By making at least one of the first reflecting surface 12a and the second reflecting surface 13a a spherical surface, it is easy to manufacture the optical system UL.

[0050] In addition, if Figure 2 As shown in (b), a refractive optical system (e.g., a lens) 15 that refracts light passing through the opening 12b of the main reflector 12 may also be provided in the optical system UL. In addition, the optical system UL may also be a Cassegrain optical system without the correction plate 11. In addition, it is preferred that the optical axes of the optical elements included in the optical system UL are all consistent. At least, it is preferred that the optical axis of the main reflector 12 and the optical axis of the sub-reflector 13 are consistent except that the directions in which the light passes are opposite.

[0051] In the camera module 10 of the present embodiment, by making the optical system UL a reflective optical system (a reflective optical system of a Cassegrain method, a Schmidt-Cassegrain method, or a compact Schmidt-Cassegrain method) using the above-mentioned reflective surface, the length of the optical system (from the surface closest to the object side ( Figure 2In the case of (a), the physical distance from the object-side surface of the correction plate 11 (correction surface 11a) to the image plane (imaging surface of the imaging element 14) becomes 1 / 2 to 1 / 3.

[0052] In addition, in the optical system UL of the present embodiment, the medium between the first reflecting surface 12a of the main reflecting mirror 12 and the second reflecting surface 13a of the auxiliary reflecting mirror 13 is air. When configured as described above, the camera module 10 having the optical system UL can be easily manufactured. In addition, when not taking pictures, the correction plate 11 and the auxiliary reflecting mirror 13 can be moved (so-called retracted) to the main reflecting mirror 12 side and stored, so that the camera module 10 can be miniaturized, so that at least a part of it can be accommodated in an optical device such as a camera.

[0053] In addition, the optical system UL of the present embodiment preferably satisfies the following conditional expression (1).

[0054] TL<15.0mm (1)

[0055] in,

[0056] TL: The distance from the surface of the optical system UL closest to the object to the image plane I in the direction of the optical axis incident on the image plane I

[0057] Conditional expression (1) shows the appropriate range of the length of the optical system UL in the optical axis direction when the optical system UL is composed of a reflective optical system of the Schmidt-Cassegrain (or compact Schmidt-Cassegrain) method. In addition, in order to reliably obtain the effect of the conditional expression (1), it is preferred that the upper limit value of the conditional expression (1) is 14.0 mm, 13.0 mm, and more preferably 12.0 mm. In addition, in order to reliably obtain the effect of the conditional expression (1), it is preferred that the lower limit value of the conditional expression (1) is 6 mm. In addition, in the case of having Figure 2 In the case of the correction plate 11 shown in FIG. 1 , the surface of the optical system UL closest to the object side becomes the correction surface 11 a .

[0058] In addition, the optical system UL of the present embodiment preferably satisfies the following conditional expression (2).

[0059] 10.00°<ω (2)

[0060] in,

[0061] ω: Half field of view of the optical system UL

[0062] Conditional expression (2) shows the appropriate range of the half-angle of view of the optical system UL when the optical system UL is constituted by a reflective optical system of the Schmidt-Cassegrain (or compact Schmidt-Cassegrain) method. In addition, in order to reliably obtain the effect of the conditional expression (2), it is preferred that the lower limit value of the conditional expression (2) is 8.00°, 6.00°, 5.00°, 4.00°, 3.50°, 3.00°, 2.50°, 2.00°, and more preferably 1.50°.

[0063] When the optical system UL of the present embodiment is a compact Schmidt-Cassegrain system, the thickness ΔL of the correction plate 11 is expressed by the following formula (a). Formula (a) is disclosed in APPLIED OPTICS Vol. 13, No. 8, August 1974.

[0064] ΔL=[(h / r) 4 -1.5(h / r) 2 ] r / {256(n-1)P′ 3}+k (a)

[0065] in,

[0066] P′=P 1 / G 1 / 3

[0067] P 1 : F value of the main reflector 12

[0068] G: Ratio of the calculated depth of the correction plate 11

[0069] h: Height perpendicular to the optical axis

[0070] r: correction radius (curvature radius) of the correction plate 11

[0071] n: refractive index of the medium constituting the correction plate 11

[0072] k: center thickness of the correction plate 11

[0073] In addition, in the optical system UL of the present embodiment, a transmission component that transmits light from an object may be appropriately disposed at a position on the optical path. By disposing the transmission component, an aspheric surface can be formed on the transmission component to perform aberration correction. The aspheric surface of the transmission component (including the correction surface 11a of the correction plate 11) preferably has at least one inflection point from the optical axis toward the periphery.

[0074] In addition, the optical system UL of the present embodiment preferably satisfies the following conditional expression (3).

[0075] -0.1 <f / fa<0.1 (3)

[0076] in,

[0077] fa: focal length of correction surface 11a

[0078] f: focal length of the entire optical system UL

[0079] Conditional expression (3) shows the appropriate range of the ratio of the focal length of the entire system of the optical system UL to the correction surface 11a when the optical system UL is constituted by a reflection optical system of the Schmidt-Cassegrain (or compact Schmidt-Cassegrain) method. In addition, in order to reliably obtain the effect of the conditional expression (3), it is preferred that the lower limit value of the conditional expression (3) is -0.05, -0.02, and more preferably 0.00. In addition, in order to reliably obtain the effect of the conditional expression (3), it is preferred that the upper limit value of the conditional expression (3) is 0.09, 0.08, 0.07, 0.06, and more preferably 0.05.

[0080] In addition, the optical system UL of the present embodiment preferably satisfies the following conditional expression (4).

[0081] -0.1 <f / fb<0.1 (4)

[0082] in,

[0083] fb: focal length of correction plate 11

[0084] f: focal length of the entire optical system UL

[0085] Conditional expression (4) shows the appropriate range of the ratio of the focal length of the entire optical system UL to the focal length of the correction plate 11 when the optical system UL is constituted by a reflection optical system of the Schmidt-Cassegrain (or compact Schmidt-Cassegrain) method. In addition, in order to reliably obtain the effect of the conditional expression (4), it is preferred that the lower limit value of the conditional expression (4) is -0.05, -0.02, and more preferably 0.00. In addition, in order to reliably obtain the effect of the conditional expression (4), it is preferred that the upper limit value of the conditional expression (4) is 0.09, 0.08, 0.07, 0.06, and more preferably 0.05.

[0086] In addition, the optical system UL of the present embodiment preferably satisfies the following conditional expression (5).

[0087] 3.0 <M<8.0 (5)

[0088] in,

[0089] M=f / f1

[0090] f: focal length of the entire optical system UL

[0091] f1: focal length of the main reflector 12

[0092] Conditional expression (5) shows an appropriate range of the secondary magnification ratio M of the optical system UL when the optical system UL is configured by a reflection optical system of the Schmidt-Cassegrain (or compact Schmidt-Cassegrain) method.

[0093] Figure 3 The astigmatism of the Cassegrain and Schmidt-Cassegrain reflective optical systems for the secondary zoom ratio M is shown. Figure 3 It can be seen that when the optical system UL is formed by a reflective optical system of the Schmidt-Cassegrain method (or compact Schmidt-Cassegrain method), the astigmatism can be reduced to 0 by making the secondary magnification ratio M 5.6. Therefore, by making the optical system UL satisfy the conditional formula (5), the generation of astigmatism can be suppressed and a good image can be obtained. In addition, in order to reliably obtain the effect of the conditional formula (5), it is preferred that the lower limit value of the conditional formula (5) is 3.5, and more preferably 4.0, 4.5, and 5.0. In addition, in order to reliably obtain the effect of the conditional formula (5), it is preferred that the upper limit value of the conditional formula (5) is 7.5, and more preferably 7.0, 6.5, and 6.0.

[0094] In addition, the optical system UL of the present embodiment preferably satisfies the following conditional expression (6).

[0095] f<500mm (6)

[0096] in,

[0097] f: focal length of the entire optical system UL

[0098] Conditional expression (6) shows the appropriate range of the focal length of the entire optical system UL when the optical system UL is constituted by a reflective optical system of the Schmidt-Cassegrain (or compact Schmidt-Cassegrain) method. In addition, in order to reliably obtain the effect of the conditional expression (6), it is preferred that the lower limit value of the conditional expression (6) is 0.1 mm, and more preferably 1 mm, 5 mm, 10 mm, 20 mm. In addition, in order to reliably obtain the effect of the conditional expression (6), it is preferred that the upper limit value of the conditional expression (6) is 380 mm, and more preferably 280 mm, 230 mm, 190 mm, 140 mm, 90 mm, 70 mm, 55 mm, 45 mm.

[0099] In addition, the optical system UL of the present embodiment preferably satisfies the following conditional expression (7).

[0100] 0.4 <RL / TL<1.2 (7)

[0101] in,

[0102] RL: The distance on the optical axis between the first reflecting part and the second reflecting part in the direction of the optical axis of the optical system UL

[0103] TL: The distance from the surface of the optical system closest to the object to the image plane in the direction of the optical axis incident on the image plane

[0104] The conditional expression (7) shows the appropriate range of the ratio of the distance from the surface closest to the object side of the optical system UL to the image plane to the distance between the reflection surfaces. In addition, in order to reliably obtain the effect of the conditional expression (7), it is preferred that the upper limit value of the conditional expression (7) is 1.0, 0.9, and more preferably 0.85. In addition, in order to reliably obtain the effect of the conditional expression (7), it is preferred that the lower limit value of the conditional expression (7) is 0.6, 0.7.

[0105] In addition, the optical system UL of the present embodiment preferably satisfies the following conditional expression (8).

[0106] 0.5 <D1 / RL<2.0 (8)

[0107] in,

[0108] D1: The outer diameter of the first reflecting surface

[0109] RL: The distance on the optical axis between the first reflecting part and the second reflecting part in the direction of the optical axis of the optical system UL

[0110] Conditional expression (8) shows an appropriate range of the ratio of the length of the optical system UL in the direction of the optical axis and the direction perpendicular to the optical axis. Here, regarding the outer diameter of the first reflecting surface, when the first reflecting surface is circular, it is the diameter, and when the first reflecting surface is rectangular, it is the maximum outer diameter. In addition, in order to reliably obtain the effect of the conditional expression (8), it is preferred that the upper limit value of the conditional expression (8) is 1.7, 1.5, and more preferably 1.3. In addition, in order to reliably obtain the effect of the conditional expression (8), it is preferred that the lower limit value of the conditional expression (8) is 0.7, 0.8, and more preferably 0.85.

[0111] In addition, the optical system UL of the present embodiment preferably satisfies the following conditional expression (9).

[0112] 1.0 <D1 / D2<6.0 (9)

[0113] in,

[0114] D1: The outer diameter of the first reflecting surface

[0115] D2: outer diameter of the second reflecting surface

[0116] Conditional expression (9) shows the appropriate range of the ratio of the outer diameters of the reflecting surfaces. Here, the outer diameter of the first reflecting surface or the outer diameter of the second reflecting surface is the diameter when the reflecting surface is circular, and the maximum outer diameter when the reflecting surface is rectangular. In addition, in order to reliably obtain the effect of the conditional expression (9), it is preferred that the upper limit value of the conditional expression (9) is 5.0, 5.5, and more preferably 3.0. In addition, in order to reliably obtain the effect of the conditional expression (9), it is preferred that the lower limit value of the conditional expression (9) is 1.3, 1.5, and more preferably 3.5.

[0117] In addition, the optical system UL of the present embodiment preferably satisfies the following conditional expression (10).

[0118] 5.0 <D0 / Y<15.0 (10)

[0119] in,

[0120] D0: The outer diameter of the incident surface of the optical system UL closest to the object side

[0121] Y: Maximum image height of the image sensor 14

[0122] The conditional expression (10) shows the appropriate range of the ratio of the outer diameter of the incident surface to the maximum image height of the imaging element 14. Here, the outer diameter of the incident surface is the diameter when the incident surface is circular, and the maximum outer diameter when the incident surface is rectangular. In addition, in order to reliably obtain the effect of the conditional expression (10), it is preferred that the upper limit value of the conditional expression (10) is 14.5, 14.0, and more preferably 9.0. In addition, in order to reliably obtain the effect of the conditional expression (10), it is preferred that the lower limit value of the conditional expression (10) is 6.0, 7.0, and more preferably 10.0.

[0123] (Regarding the multi-eye structure of the camera module 10)

[0124] exist Figure 1 In the above description, the camera module 10 is constituted by the optical system UL and the imaging element 14 as a set of imaging units. Figure 4 and Figure 5 As shown in FIG. 1 , the camera module 1 may be a multi-eye structure imaging device in which a plurality of the camera modules 10 are arranged two-dimensionally. In the following description, the camera module 10 in the multi-eye structure is referred to as a “unit block 10”. In the following description related to the multi-eye structure, Figure 4As shown in FIG. 1 , although the camera module 1 is described as being composed of three rows and three columns, a total of nine unit blocks 10 (hereinafter referred to as "3×3"), the same effect can be obtained by being composed of two or more unit blocks 10. The number of unit blocks 10 included in a row may be different from the number of unit blocks 10 included in a column. As described later, when synthesizing images obtained from the imaging elements 14 constituting the unit blocks 10, by making the number of unit blocks 10 included in a row the same as the number of unit blocks 10 included in a column, an image with the same resolution in the vertical and horizontal directions can be generated. In addition, the optical systems UL of the plurality of unit blocks 10 constituting the camera module 1 are arranged in such a manner that their respective optical axes are substantially parallel to each other. In addition, the imaging elements 14 of the plurality of unit blocks 10 are arranged on a plane orthogonal to the optical axis, and are arranged two-dimensionally in the X-axis direction orthogonal to the optical axis and in the Y-axis direction orthogonal to the X-axis and the optical axis.

[0125] The camera module 1 of this embodiment can reduce the length of the optical system UL of the unit block 10 (physical distance from the surface closest to the object to the image plane) to 1 / 2 to 1 / 3 compared to the case where the optical system UL of the unit block 10 is formed by a refractive optical system as described above (a reflective optical system of the Cassegrain method, the Schmidt-Cassegrain method, or the compact Schmidt-Cassegrain method). In addition, the camera module 1 of this embodiment includes a plurality of unit blocks 10, and by synthesizing the images obtained by the imaging elements 14 of each unit block 10, it is possible to obtain a high-resolution image higher than the resolution of each imaging element 14, so that the size of the imaging element 14 can be reduced (even if each imaging element 14 is reduced in size and its resolution is reduced, a high-resolution image can be obtained by synthesizing the images). By miniaturizing the imaging element 14, the focal length of the optical system UL of the unit block 10 can be shortened. Therefore, by using the folding optical system and the image synthesis effect of the plurality of unit blocks 10 , the camera module 1 of this embodiment can have a total length of less than 1 / 4 compared to a camera module composed of one unit block 10 using a refractive optical system having the same resolution.

[0126] (Assembly Structure of Camera Module 1)

[0127] Next, the assembly structure of the camera module 1 of this embodiment will be described. In addition, although the assembly structure of the camera module 1 with a multi-eye structure is described here ( Figure 4 and Figure 5 ), but in the monocular camera module 10 ( Figure 1 ) is the same.

[0128] like Figure 4 and Figure 5As shown, the camera module 1 of the present embodiment is composed of: a first optical component 110 formed with a correction plate 11 (correction component) and a secondary reflector 13 (second reflector); a second optical component 120 formed with a main reflector 12 (first reflector); a partition component 130, which is arranged between the first optical component 110 and the second optical component 120 and is set at the boundary between the unit blocks 10 to prevent light from being incident on adjacent unit blocks 10; and a shooting component 140 equipped with a shooting element 14.

[0129] Regarding the first optical component 110, Figure 6 As shown in FIG. 1A , a plurality of correction plates 11 are formed by printing a polymer as a medium for transmitting light on the upper surface (the surface on the object side of the optical system UL) of a parallel plane glass plate 111 formed of a medium for transmitting light. Figure 4 In the example, 9 correction plates 11 are formed in a 3×3 pattern. Alternatively, the first optical component 110 may be produced by cutting out a substrate material on which the correction plates 11 are formed by printing or the like. In addition, a reflective component that reflects light is masked and coated on the lower surface of the parallel plane glass plate 111 (the surface on the image side in the optical system UL), and a plurality of secondary reflectors 13 are formed (in Figure 4 In the example, 9 secondary reflectors 13 are formed in a 3×3 pattern. As described above, by forming a plurality of correction plates 11 and a plurality of secondary reflectors 13 on both sides of a parallel plane glass 111, it is possible to manufacture, for example, a single process. Figure 4 The nine unit blocks 10 of 3×3 shown have respective correction plates 11 and secondary reflecting mirrors 13 .

[0130] In addition, although Figure 6 (a) shows a case where the correction surface is formed on the object side surface of the correction plate 11, but the correction surface may be formed on the image side surface of the correction plate 11. When the correction surface is formed on the image side surface of the correction plate 11, the correction surface can be formed together with the secondary reflector 13 formed on the surface, so that the manufacturing process can be simplified.

[0131] Regarding the second optical component 120, Figure 6 As shown in (b), a plurality of primary reflectors 12 ( Figure 4 In the example, 9 primary reflectors 12 are formed in a 3×3 pattern. In addition, by forming a parallel plane glass plate 121 with a medium that transmits light, an opening 12b can be formed in each unit block 10 by forming a portion where the primary reflector 12 is not masked. As described above, by forming the primary reflector 12 on a single surface (the surface on the object side of the optical system UL) of a parallel plane glass 121, it is possible to manufacture, for example, in a single process. Figure 4The primary reflectors 12 of the 3×3 unit blocks 10 are shown.

[0132] In addition, if Figure 2 As shown in (b), when the optical system UL is provided with a refractive optical system 15 such as a lens, a lens surface capable of refracting light may be formed on the parallel plane glass plate 121 .

[0133] like Figure 7 As shown, the partition member 130 is formed by an optical partition grid that divides the optical system UL of the unit block 10. The first optical component 110 is arranged on the object side of the partition member 130, and the second optical component 120 is arranged on the image side of the partition member 130. By fixing the first optical component 110 on the object side of the partition member 130 and fixing the second optical component 120 on the image side of the partition member 130, the partition member 130 can prevent the light of the optical system UL of the unit block 10 from being incident on the adjacent unit block 10, and also position the first optical component 110 and the second optical component 120 in the optical axis direction. In addition, in the following description, the first optical component 110, the second optical component 120 and the partition member 130 that are integrally formed are referred to as the optical system block 100. The optical system block 100 is composed of a plurality of unit blocks 10. The partition wall of the partition wall member 130 is made of a material having a light-blocking effect such as metal or polymer, and has a thickness of about 0.5 to 1.0 mm. In addition, it is preferred that the inside of the partition wall is coated with an anti-reflection coating (for example, painted black) in order to optically block each unit block 10 from the outside and prevent reflection. In addition, the partition wall may be hollow (filled with air) or filled with a medium that transmits light.

[0134] like Figure 4 and Figure 5 As shown in (b), a plurality of imaging elements 14 are arranged at positions corresponding to the optical systems UL in the imaging unit 140. As described later, the position of the optical system block 100 relative to the imaging unit 140 in the direction along the optical axis may be fixed or variable.

[0135] The first optical component 110, the second optical component 120, the wall component 130 and the photographing component 140 may be integrated by adjusting the positions of the components after being manufactured separately. In addition, at least a part of the first optical component 110, the second optical component 120, the wall component 130 and the photographing component 140 may be manufactured continuously. For example, a plurality of photographing elements 14 may be arranged on a plate component, and the second optical component 120, the wall component 130 and the first optical component 110 may be formed thereon in sequence. Alternatively, the second optical component 120, the wall component 130 and the first optical component 110 may be formed in sequence and combined with the photographing component 140 after the optical system block 100 is manufactured.

[0136] In addition, the partition member 130 may be omitted, or a member for positioning the first optical member 110 and the second optical member 120 in the optical axis direction may be used instead of the partition member 130 .

[0137] In addition, the optical block 100 may be formed using a transmission component formed by a medium that transmits light. In this case, two transmission components may be used, with the correction surface 11a and the second reflection surface 13a formed on the first transmission component, and the first reflection surface 12a formed on the second transmission component that is arranged with an air gap from the first transmission component. Alternatively, when an integrated transmission component is used, the correction surface 11a and the second reflection surface 13a are formed on the surface on the object side of the transmission component, and the first reflection surface 12a is formed on the surface on the image side of the transmission component. The type of medium included in the transmission component may be one or more. Here, the different types of media refer to at least one of the refractive index or the Abbe number being different. In the case of multiple types, the transmission component is composed of a portion formed by the first medium and a portion formed by the second medium. The boundary between the portion formed by the first medium and the portion formed by the second medium is formed along a surface orthogonal to the optical axis and is a plane or a spherical surface.

[0138] (About focus)

[0139] The closest distance of the camera module 10 with a single-eye structure of the present embodiment (although the camera module 10 with a single-eye structure is described here, the same also applies to the camera module 1 with a multi-eye structure) can be determined as a reference by a distance of about 50 to 100 times the magnification. In other words, the closest distance of the camera module 10 of the present embodiment varies according to the focal length. The following Table 1 shows the relationship between the magnification and the amount of expansion and contraction of the optical system UL from infinity to the closest distance when the camera module 10 of the present embodiment is equivalent to a telephoto optical system equivalent to 300mm, 500mm, and 1000mm when the focal length is converted to a 35mm camera. In addition, as described above, since the optical system UL is integrally constructed as the optical system block 100, the first optical component 110, the partition component 130, and the second optical component 120 are integrally moved in the object direction in a manner separated from the shooting element 14. In addition, in the case of a camera module 1 with a multi-eye structure, a plurality of (9 in the present embodiment) correction plates 11 and a plurality of (9 in the present embodiment) sub-reflectors 13 are also formed as one body, a plurality of (9 in the present embodiment) main reflectors 12 are also formed as one body, and the partition wall components separating each unit block 10 are also formed as one body, so that a plurality of (9 in the present embodiment) optical systems UL can move as one body.

[0140] (Table 1) Relationship between magnification and the amount of expansion and contraction of the optical system from infinity to the closest distance

[0141] Focal length converted to 35mm camera

[0142]

[0143] Table 2 below shows the relationship between magnification and the shortest distance when the camera module 10 of the present embodiment is compared with telephoto optical systems corresponding to 300 mm, 500 mm, and 1000 mm when the focal length is converted into a 35 mm camera.

[0144] (Table 2) Relationship between magnification and the closest distance

[0145] Focal length converted to 35mm camera

[0146]

[0147] Here, in the case of a multi-eye camera module 1 composed of a plurality of optical systems UL, the focus deviation amount can be calculated using images obtained from the imaging elements 14 of each unit block 10 having the optical system UL. Since the multi-eye camera module 1 of the present embodiment has 9 unit blocks 10 of 3×3, when the pitch between the unit blocks 10 is 6 mm, the effective baseline length is 9 times the square root of 9, that is, about 20 mm, in consideration of the S / N ratio.

[0148] According to the above, the camera module 10 of this embodiment is focused by making the entire optical system block 100 (the first optical component 110, the second optical component 120, and the partition component 130) move toward the object as a whole. That is, when focusing, the distance between the optical system block 100 and the imaging component 140 is changed. For example, Figure 8 As shown, as the focusing mechanism 150, a pin 151 is installed on the outer peripheral surface of the partition member 130, and the pin 151 is pushed by a wedge member 152 installed on a ball screw 153 driven by a driving unit 154 such as a motor, so that the optical system block 100 of the camera module 1, that is, the entire optical system UL, can be moved toward the object side ( Figure 8 The camera module 10 moves in the direction of the arrow in the image (in the direction of the arrow in the image) to focus. The overall movement (expansion) of the optical system UL of the camera module 10 is equal to the expansion to the closest distance shown in Table 1. Therefore, under a 35mm camera, in a camera module 1 equivalent to 300mm and 50 times, the maximum expansion is 0.4mm (shown in Table 2, distance 1.0m), and in a camera module 1 equivalent to 1000mm and 50 times, the maximum expansion is 1.3mm (distance 3.3m). In addition, the imaging element 14 and at least a part of the optical system UL may be moved in the direction of the optical axis to perform focusing.

[0149] (About zoom)

[0150] The multi-eye camera module 1 of this embodiment is composed of a plurality of unit blocks 10, and the optical axes of the optical systems UL constituting the respective unit blocks 10 are arranged so as to be substantially parallel to each other. Therefore, the fields of view of the plurality of optical systems UL are almost overlapped ( Fig. 9 On the other hand, the multi-eye camera module 1 of the present embodiment is composed of a plurality of unit blocks 10, so by bending the optical axes of the optical systems UL constituting each unit block 10 so that the fields of view of each optical system UL do not overlap, the field of view of the entire camera module 1 can be expanded. Fig. 9 As shown in (b), the optical axis of the optical system UL of the central unit block 10 among the 3×3 optical systems UL constituting the 3×3 unit blocks 10 is not changed, and the optical axes of the optical systems UL of the surrounding 8 unit blocks 10 are bent in a direction in which the fields of view do not overlap with each other, thereby achieving a wide field of view as a whole. For example, when there are 3×3 unit blocks 10, as Fig. 9 As shown in the field of view fvw in (b), the field of view fvt can be tripled.

[0151] like Fig.10As shown in (a), as a specific method of changing magnification, an objective lens-shaped prism block (a deflection optical system as a field prism) 160 is arranged on the object side of the optical system block 100. Fig.11 As shown, the prism block 160 is configured as a parallel flat plate relative to the central optical system ULc (that is, the optical axis of the central optical system ULc is not bent), and the optical axes of the optical systems arranged around the central optical system ULc are configured to be bent outward before being incident. Specifically, the optical axes of the optical systems ULu and ULd located in the up-down direction (vertically adjacent) are bent in the vertical direction, the optical axes of the optical systems ULl and ULr located in the left-right direction (horizontally adjacent) are bent in the horizontal direction, and the optical axes of the optical systems ULul, Ulur, ULdl, and ULdr located in the oblique direction are bent in the oblique direction (the diagonal direction of the rectangular field of view). Fig.11 The bending direction is indicated by an arrow for each optical system UL.

[0152] Table 3 below shows the relationship between the angle θ of the surface of the prism block 160 facing the peripheral optical system UL and the surface of the central optical system UL when the refractive index of the base material (medium) of the prism block 160 is 1.5 ( Fig.10 (a)). In addition, Table 3 shows that when the focal length of the camera module 1 of the multi-eye structure of the present embodiment is converted into a 35mm camera, it corresponds to the focal length of 300mm, 500mm, and 1000m. Fig. 9 (b) shows the angles θ between the horizontally adjacent and the vertically adjacent when the fields of view of the respective optical systems UL do not overlap and when no gaps are generated (ie, when the nine fields of view are in close contact with each other).

[0153] (Table 3) Angle of prism block

[0154] Focal length converted to 35mm camera

[0155]

[0156]

[0157] As can be seen from Table 3, for example, when the camera module 1 of the multi-eye structure of the present embodiment is converted into a 35mm camera and is equivalent to 300mm, for the prism of the central optical system UL, a prism block 160 is installed so that the angle θ of the horizontally adjacent prisms is 13.3° and the angle θ of the vertically adjacent prisms is 9.1°, so that the field of view becomes 3 times, and the focal length becomes 1 / 3, and the magnification can be changed to 100mm. Similarly, by installing a prism block 160 composed of half of the above angles, and the angles of the horizontally adjacent and vertically adjacent prisms are 6.7° and 4.6°, the magnification can be changed to 200mm.

[0158] For example, Fig.10 As shown in (b), on a parallel plane glass plate 161 formed by a medium that transmits light, there are formed an area 160a where the above-mentioned prism block 160 is not formed, an area 160b where the prism blocks 160 with horizontally adjacent and vertically adjacent angles θ of 6.7° and 4.6°, and an area 160c where the prism blocks 160 with horizontally adjacent and vertically adjacent angles θ of 13.3° and 9.1°. When the above-mentioned area 160a is selected by sliding the parallel plane glass plate 161 relative to the optical system block 100, the focal length of the camera module 1 becomes 300 mm when converted into a 35 mm camera, when the area 160b is selected, it becomes 200 mm when converted into a 35 mm camera, and when the area 160c is selected, it becomes 100 mm when converted into a 35 mm camera, so that step-by-step magnification can be achieved.

[0159] In addition, if a liquid crystal element is used as the prism block 160, the angle of the bent optical axis can be continuously changed, and continuous magnification can be achieved. Specifically, a liquid crystal element is arranged for each unit block 10 (optical system UL), and the structure is such that Fig.11 The light is deflected in the direction shown, and the prism amount is changed by changing the voltage applied to the liquid crystal element. In addition, since the liquid crystal element only corresponds to one polarization direction, it is necessary to stack the same liquid crystal elements with changed orientation, or stack the same liquid crystal elements with 1 / 2 wavelength plates sandwiched therebetween.

[0160] (About removing stray light)

[0161] like Fig.12 As shown in the light L shown in (a), light obliquely incident on the correction plate 11 of the optical system UL may pass through the opening 12b of the main reflector 12 and directly enter the image sensor 14 to become stray light. As a method of removing such stray light, two configurations are described below.

[0162] - Structure 1 -

[0163] like Fig.12 As shown in (b), the first structure for removing stray light uses a prevention portion 19 that combines a first polarizing plate 16 as a first polarizing member, a second polarizing plate 18 as a second polarizing member, and a wavelength film 17 as a polarization direction rotating member. The first polarizing plate 16 is arranged on the object side of the correction plate 11, and is configured so that only light that has passed through the first polarizing plate 16 is incident on the correction plate 11. Here, the first polarizing plate 16 has a function of passing light polarized in a predetermined direction, so the light that passes through the first polarizing plate 16 and is incident on the correction plate 11 becomes light of a predetermined polarization direction.

[0164] The wavelength film 17 is formed on the second reflection surface 13a of the secondary reflector 13. The wavelength film 17 has a function of rotating the polarization direction of the light passing therethrough by 45°. That is, the wavelength film 17 has the function of a wavelength plate (λ / 4 plate). Therefore, the light that passes through the correction plate 11 and is reflected by the first reflection surface 12a of the main reflector 12 passes through the wavelength film 17 and has its polarization direction rotated by 45°, and is reflected by the second reflection surface 13a of the secondary reflector 13. Furthermore, the light reflected by the second reflection surface 13a passes through the wavelength film 17 again and has its polarization direction rotated by 45°. Therefore, the light emitted from the wavelength film 17 becomes a state in which its polarization direction is rotated by 90° relative to the light before the incident. In addition, the wavelength film 17 can be any structure as long as it rotates the polarization directions of the incident light and the emitted light.

[0165] The second polarizing plate 18 is disposed between the opening 12b of the main reflector 12 and the imaging element 14. The second polarizing plate 18 also has the function of passing light polarized in a predetermined direction similarly to the first polarizing plate 16, and is disposed in a state where the polarization direction of the light passing through the second polarizing plate 18 is orthogonal to the polarization direction of the light passing through the first polarizing plate 16 (rotated by 90°). Alternatively, the second polarizing plate 18 may be attached to the opening 12b of the main reflector 12, or may be formed on the surface of an optical component (second optical component 120) constituting the opening 12b.

[0166] As described above, the polarization direction of the light that has passed through the first polarizing plate 16 is rotated 90° by the wavelength film 17 before entering the second polarizing plate 18, and thus is consistent with the polarization direction that can pass through the second wavelength film 18. That is, the light that has passed through the first polarizing plate 16, the correction plate 11, the main reflector 12, the wavelength film 17, the sub-reflector 13, and the wavelength film 17 in this order can pass through the second wavelength film 18 and enter the imaging element 14. On the other hand, the light that has passed through the first polarizing plate 16 and the correction plate 11 and is intended to pass through the opening 12b without being reflected by the main reflector 12 (for example, Fig.12 The light ray L) of (a) is the light having the polarization direction when passing through the first polarizing plate 16, and therefore is offset by 90° from the polarization direction of the light passing through the second polarizing plate 18, and cannot pass through the second polarizing plate 18, and cannot enter the imaging element 14. Therefore, according to the first structure, the preventing portion 19 prevents the light having the number of reflections by the first reflecting portion (main reflecting mirror 12) and the second reflecting portion (sub-reflecting mirror 13) other than the predetermined number of reflections from entering the imaging element 14. Here, the light having the number of reflections by the first reflecting portion and the second reflecting portion other than the predetermined number of reflections, for example, Fig.12 In the example, it refers to light whose number of reflections by the first reflecting part and the second reflecting part is other than 1, that is, light whose number of reflections by the first reflecting part and the second reflecting part is 0 or 2 or more. Fig.17In the example, it refers to light whose reflection times by the first reflecting part and the second reflecting part are other than 2 times, that is, light whose reflection times by the first reflecting part and the second reflecting part are 0 times, 1 time, 3 times or more. Therefore, it is also possible to effectively remove stray light (light beam L) that passes through the opening 12b without being reflected by both the main reflecting mirror 12 and the secondary reflecting mirror 13 (the reflection times are 0).

[0167] In addition, in the case of the multi-eye camera module 1 of the present embodiment, as Figure 5 As shown in FIG. 5( b ) and the like, a plurality of imaging elements 14 are arranged, and therefore the polarization direction of light transmitted through the first polarizing plate 16 and the second polarizing plate 18 is preferably consistent with the direction in which the imaging elements 14 are arranged.

[0168] In addition, according to the above-mentioned structure, the polarization direction of the light passing through the first polarizer 16 and the second polarizer 18 is fixed in one direction. At this time, for example, when the polarization direction of the light reflected by the second reflecting surface 13a is different from the polarization direction of the light passing through the first polarizer 16, it is impossible to shoot an image based on the light. Therefore, it is preferable to configure so that the first polarizer 16 and the second polarizer 18 can be mechanically rotated to rotate the polarization direction of the light that can pass through the first polarizer 16 and the second polarizer 18. At this time, it can also be configured so that the first polarizer 16 and the second polarizer 18 are constituted by liquid crystal polarizers, so that the polarization direction of the light that can pass through the first polarizer 16 and the second polarizer 18 can be electronically rotated. When the camera modules 1 and 10 of this embodiment are mounted on a drone or a vehicle, for example, the polarization directions of the first polarizer 16 and the second polarizer 18 can be rotated according to the state (flight / travel direction or inclination) of the mounted drone or vehicle.

[0169] In addition, in the present embodiment, the first polarizing plate 16 only needs to be arranged on the optical path on the object side relative to the main reflector 12, and is preferably arranged on the object side relative to the correction plate 11. In addition, in the present embodiment, the second polarizing plate 18 only needs to be arranged on the optical path on the image side relative to the sub-reflecting mirror 13, and is preferably arranged on the image side relative to the main reflector 12. In addition, the wavelength film 17 only needs to be arranged on the optical path between the first polarizing plate 16 and the second polarizing plate 18, and is preferably formed on the reflection surface of the main reflector 12 or the sub-reflecting mirror 13.

[0170] In addition, in the case of the first structure, light other than the polarization direction that can pass through the first polarizing plate 16 among the light incident on the optical system UL constituting the camera module 1, 10 does not contribute to the image formation. Therefore, in addition to the above-mentioned polarization function, the first polarizing plate 16 is also provided with a solar cell function that converts the light of the polarization direction that cannot pass through into electricity, so that the light incident on the optical system UL can be effectively used. The electricity converted from the light by the first polarizing plate 16 is used by the control unit 20 described later, for example, to generate an image from the imaging element 14.

[0171] In addition, the solar cell for supplying power for operating the camera modules 1 and 10 may be provided not only as the first polarizing plate 16 but also, for example, disposed at a position on the object side surface of the correction plate 11 where the secondary reflector 13 is disposed on the back side. Figure 1 As can be seen from the figure, light cannot pass through the portion of the correction plate 11 where the secondary reflector 13 is arranged (does not contribute to the formation of an image), so the space on the object side of the correction plate 11 can be effectively used as a location for arranging solar cells. Similarly, solar cells can be arranged on the portion of the surface on the object side of the correction plate 11 where light that does not contribute to the formation of an image passes (for example, the peripheral portion of the optical system UL).

[0172] -Structure 2-

[0173] The second structure for removing stray light is a structure in which the prevention portion 19 has a light shielding property. Fig.13 As shown, the preventing portion 19 includes a first light shielding member 19 a and a second light shielding member 19 b disposed between the main reflector 12 and the sub-reflector 13 in the optical axis direction of light incident on the main reflector 12 .

[0174] The first light shielding member 19a separates the optical path of light that passes through the correction plate 11 and enters the main reflector 12 and is then reflected by the main reflector 12 and guided to the sub-reflector 13, from the optical path of light that is reflected by the sub-reflector 13 and guided to the opening 12b. The first light shielding member 19a is arranged on the optical axis side of the light reflected by the main reflector 12, and is formed to surround the optical axis of the optical system UL when viewed from the optical axis direction. Fig.13As shown in FIG. 1 , the first light shielding member 19a is a cylindrical member (arranged on the inner circumference of the first reflecting portion) arranged at the boundary between the reflecting surface 12a of the main reflecting mirror 12 and the opening 12b (the second region formed so as to surround the first reflecting portion) so as to surround the opening 12b. The first light shielding member 19a is formed so as to protrude from the surface of the main reflecting mirror 12 toward the sub-reflecting mirror 13. In addition, the cross-sectional shape of the first light shielding member 19a is such that the inner diameter thereof becomes thinner as it moves from the main reflecting mirror 12 side toward the sub-reflecting mirror 13 side. In addition, in the cross-sectional shape of the first light-shielding component 19a, an angle θ1 (θ1m) formed by a surface on the inner diameter side (surface on the optical axis side) and a surface perpendicular to the optical axis is smaller than an angle θ2 (θ2m) formed by a surface on the outer diameter side (surface on the side opposite to the optical axis) and a surface perpendicular to the optical axis. Therefore, the thickness of the side surface of the first light-shielding component 19a is configured to become thicker from the main reflector 12 side toward the secondary reflector 13 side.

[0175] The second light shielding member 19b separates the optical path of the light that passes through the correction plate 11 and is introduced into the main reflector 12 from the optical path of the light that is reflected by the main reflector 12 and is incident on the sub-reflector 13 and is reflected by the sub-reflector 13 and introduced into the opening 12b. The second light shielding member 19b is arranged on the side opposite to the optical axis of the light reflected by the sub-reflector 13 so as to surround the light beam reflected by the sub-reflector 13. Fig.13 As shown in FIG. 1 , the second light shielding member 19b is a cylindrical member (arranged on the outer peripheral portion of the second reflecting portion) arranged in a manner of surrounding the reflecting surface 13a of the secondary reflector 13 arranged in the first region. The second light shielding member 19b is formed to protrude from the surface of the secondary reflector 13 toward the main reflector 12. In addition, the cross-sectional shape of the second light shielding member 19b is such that the inner diameter thereof increases from the secondary reflector 13 side toward the main reflector 12 side. In addition, in the cross-sectional shape of the second light shielding member 19b, the angle θ1 (θ1s) formed by the surface on the inner diameter side (the surface on the optical axis side) and the surface orthogonal to the optical axis is smaller than the angle θ2 (θ2s) formed by the surface on the outer diameter side (the surface on the side opposite to the optical axis) and the surface orthogonal to the optical axis, and therefore the thickness of the side surface of the second light shielding member 19b is configured to become thinner from the secondary reflector 13 side toward the main reflector 12 side.

[0176] Such first light shielding member 19a and second light shielding member 19b preferably satisfy the following conditional expressions (11) to (13).

[0177] 1.0<θ2s / θ1s<2.0 (11)

[0178] 30°<θ2s<90° (12)

[0179] 30°<θ2m<90° (13)

[0180] in,

[0181] θ1s: Angle between the inner diameter side surface of the second light shielding member 19b and the surface perpendicular to the optical axis

[0182] θ2s: Angle between the outer diameter side surface of the second light shielding member 19b and the surface perpendicular to the optical axis

[0183] θ2m: Angle between the outer diameter side surface of the first light shielding member 19a and the surface perpendicular to the optical axis

[0184] Conditional expressions (11) to (13) define the ratio of the angle formed by the surface on the outer diameter side of the first light shielding member 19a and the surface orthogonal to the optical axis to the angle formed by the surface on the inner diameter side of the second light shielding member 19b and the surface orthogonal to the optical axis when the angles θ2m and θ2s formed by the surface on the outer diameter side of the first light shielding member 19a and the second light shielding member 19b meet predetermined conditions. The first light shielding member 19a and the second light shielding member 19b satisfy conditional expressions (11) to (13), thereby being able to effectively remove stray light.

[0185] In order to reliably obtain the effect of conditional expression (11), it is preferable that the lower limit value of conditional expression (11) is 1.095. In order to reliably obtain the effect of conditional expression (11), it is preferable that the upper limit value of conditional expression (11) is 1.595.

[0186] In order to reliably obtain the effect of conditional expression (12), it is preferable that the lower limit value of conditional expression (12) is 54.5°. In order to reliably obtain the effect of conditional expression (12), it is preferable that the upper limit value of conditional expression (12) is 84.5°.

[0187] In order to reliably obtain the effect of conditional expression (13), it is preferable that the lower limit value of conditional expression (13) is 55.0°. In order to reliably obtain the effect of conditional expression (13), it is preferable that the upper limit value of conditional expression (13) is 85.0°.

[0188] Specifically, Fig.13 The shapes of the first light shielding member 19a and the second light shielding member 19b shown have the relationship shown in Table 4 below. In Table 4, the taper is a value obtained by dividing the radius of the base end by the radius of the front end in the outer diameter and the inner diameter. Here, regarding the base end, if it is the first light shielding member 19a, it is the end on the main reflector 12 side (image side), and if it is the second light shielding member 19b, it is the end on the secondary reflector 13 side (object side). In addition, regarding the front end, if it is the first light shielding member 19a, it is the end on the object side, and if it is the second light shielding member 19b, it is the end on the image side.

[0189] (Table 4) Shapes of the first and second light shielding members

[0190]

[0191] As described above, the first light shielding member 19a and the second light shielding member 19b shown in Table 4 satisfy the above-mentioned conditional expressions (7) to (9).

[0192] By making the first light shielding member 19a and the second light shielding member 19b into the above-mentioned shapes, in each of the optical systems UL of the present embodiment, while guiding the light that contributes to the imaging to the imaging element 14 (ensuring the light beam required for the imaging), it is possible to effectively remove stray light such as the light that directly enters the opening 12b through the correction plate 11 or the light that enters the opening 12b through the reflection of the parts other than the main reflector 12 and the sub-reflector 13. In addition, with respect to the first light shielding member 19a and the second light shielding member 19b constituting the prevention portion 19, the above-mentioned effect can be obtained not only by providing both but also by providing at least one of them.

[0193] (Position Setting of the Optical Axis Direction of the Image Sensor for Each Unit Block)

[0194] In the above-mentioned multi-eye camera module 1, for example, Figure 5 As shown in (b), in each of the plurality of unit blocks 10, the optical system UL has the same structure, and all the imaging elements 14 are arranged at the same position relative to the optical axis direction (for example, in such a manner that the focal plane in the infinite focus state is substantially consistent with the imaging surface of the imaging element 14). Here, when the position of the imaging element 14 is changed relative to the optical system UL in the optical axis direction, the focus state (focus distance) can be changed as also shown in the above description related to focusing. Therefore, Fig.14 As shown, for each unit block 10 constituting a camera module 1 with a multi-eye structure, the imaging element 14 is arranged at a different position in the optical axis direction (in other words, at least two of the unit blocks 10 serving as the imaging unit are arranged in a manner in which the relative positions of the optical system UL and the imaging element 14 in the optical axis direction are different), thereby being able to simultaneously obtain images of different focusing distances for the same subject through one camera module 1.

[0195] Fig.14Three unit blocks 10a, 10b, and 10c constituting the camera module 1 are shown. Furthermore, the following is shown: the imaging element 14a of the unit block 10a is arranged so that its imaging surface is roughly consistent with the focal plane when the optical system UL is focused at infinity, the imaging element 14c of the unit block 10c is arranged so that its imaging surface is roughly consistent with the focal plane when the optical system UL is focused at the closest, and the imaging element 14b of the unit block 10b is arranged so that its imaging surface is roughly consistent with the focal plane when the optical system UL is focused at an intermediate focal length between infinity and the closest. The difference in position between the imaging elements in the optical axis direction may be a value corresponding to the subject depth of the optical system UL.

[0196] In addition, when there are four or more unit blocks 10 constituting the camera module 1 of the multi-eye structure, the imaging element 14 of any one of the unit blocks 10 may be arranged at a position of an infinite focus state, and the imaging element 14 of any remaining unit block 10 may be arranged at a position of an extremely close focus state, and the imaging elements 14 of the remaining unit blocks 10 may be arranged at positions where the focus distance from infinity to the extremely close focus distance is equally divided by the number of the remaining unit blocks 10, or may be arranged in front and behind the predetermined focus distance as the center. In addition, a plurality of unit blocks 10 each having an imaging element 14 arranged at the same focus distance may be provided in one camera module 1. In addition, the position of the imaging element 14 relative to the optical axis direction of the optical system UL (the position of at least a part of the optical system UL or the imaging element 14 in the optical axis direction) may also be changed.

[0197] In a multi-eye camera module 1, by providing unit blocks 10 with different positions in the optical axis direction of the imaging element 14, images with different focus distances can be photographed at once for the same subject. In addition, by performing image processing on images with different focus distances, an image with an arbitrary focus distance can be generated. In addition, based on the difference in focus states of multiple image signals obtained from multiple imaging elements 14, the distance to the subject can also be calculated.

[0198] In addition, by performing image processing on images at different focus distances, a three-dimensional image of the subject can be generated, and the distance of the subject in the depth direction (height direction) can be obtained. For example, by obtaining an image of a building while the multi-eye camera module 1 of this embodiment is mounted on a drone, the height of the building can be obtained by performing image processing.

[0199] (Combination with lighting device)

[0200] Although the multi-eye camera module 1 of this embodiment is composed of a plurality of unit blocks 10, all the unit blocks 10 are composed of the same optical system UL. Fig.15 As shown in FIG. 1 , in a part of the bit blocks 10 (for example, the unit blocks 10a and 10c), when a light source 70 composed of an LED or the like is arranged instead of the imaging element 14, the unit block 10 arranged with the light source 70 can be used as a lighting device. In the following description, the unit block 10b having the imaging element 14 is referred to as an "imaging block", and the unit blocks 10a and 10c having the light source 70 are referred to as "lighting blocks".

[0201] Here, in the unit block 10 (imaging block 10b) in which the imaging element 14 is arranged and the unit block 10 (illumination block 10a, 10c) in which the light source 70 is arranged, the positions of the imaging element 14 and the light source 70 in the optical axis direction of the optical system UL may be the same position or different positions. In addition, the unit block 10 (imaging block 10b) in which the imaging element 14 is arranged and the unit block 10 (illumination block 10a, 10c) in which the light source 70 is arranged are the same optical system UL, and in addition, by making the optical axis of the optical system UL arranged at the position corresponding to the light source 70 parallel to the optical axis of the optical system UL arranged at the position corresponding to the imaging element 14, the light source 70 is arranged at the same position as the imaging element 14 in the optical axis direction relative to the optical system UL, so that the field of view as the camera and the illumination field as the illumination device are roughly consistent. Therefore, when configured as described above, it is possible to be compact and effectively illuminate the light from the light source 70 to the photographic range (field of view) to obtain a bright image. In addition, as a countermeasure against ghosting of the light source 70 , the position of the light source 70 relative to the optical system UL and the position of the image sensor 14 relative to the optical system UL may be made different.

[0202] Fig.16 FIG. 1 shows an example of the arrangement of a camera unit block (imaging block) 10 and a lighting unit block (illumination block) 10 in a 3×3 camera module 1. For example, Fig.16 (a) is a case where the central unit block 10 is used as a camera and the peripheral unit blocks 10 are configured as lighting devices. Fig.16 In the structure of (a), the central camera is illuminated from the periphery, so bright illumination can be obtained, and the subject is illuminated from eight directions around the periphery, so the area where shadows are generated can be reduced (it can become a shadowless lamp). Fig.16 In the case of the camera module 1 having the structure of (a), a bright image without shadows can be obtained.

[0203] Fig.16(b) is a case where the middle layer in the horizontal direction (row direction) or vertical direction (column direction) is a unit block (imaging block) 10 of a camera, and the upper and lower or left and right layers thereof are arranged as unit blocks (illumination blocks) 10 of an illumination device. Since the imaging element 14 is often rectangular (long), by arranging the unit blocks (imaging blocks) 10 of the camera in the short side direction of the imaging element 14, the difference in resolution based on the direction of the synthetic image can be reduced, and the illumination light is irradiated in a manner of sandwiching the cameras, so that an image with few shadows can be obtained.

[0204] Fig.16 (c) is a case where four unit blocks 10 in the diagonal direction or in the up, down, left, and right directions are lighting devices (lighting blocks), and the remaining unit blocks 10 are cameras (imaging blocks). Fig.16 In the structure of (c), it is possible to irradiate illumination light from four directions at 90 degrees to perform photography, so that an image without a shadow can be obtained (it can be a shadowless lamp). In addition, a stripe pattern (pattern imparting unit) based on a liquid crystal display device or a transmission screen is arranged on the object side of the correction plate 11 of the unit block (illumination block) 10 of the illumination device, and an image is obtained by lighting the four illumination devices (illumination blocks) one by one, thereby obtaining a super-resolution image based on structured illumination and measuring the height of the object.

[0205] In addition, if Fig.16 As shown in (d), the central unit block 10 can be configured as a lighting device (lighting block), and the remaining unit blocks 10 can be configured as cameras (imaging blocks).

[0206] Alternatively, a configuration may be adopted in which the wavelength of light emitted from the light source 70 of the unit block (illumination block) 10 of the illumination device is changed (the color is changed), or a configuration may be adopted in which a polarizing plate is arranged on the object side of the correction plate 11 to change the polarization direction of the illumination light. Fig.16 As shown in (a), a switching unit 80 is provided, which switches either the imaging element 14 or the light source 70 to be arranged on the optical axis of the optical system UL, and can also be arbitrarily selected. Fig.16 (a) to (e) The structures shown in the drawings. In addition, the imaging element 14 and the light source 70 may be arranged in one component (for example, the imaging component 140 described above).

[0207] (Multi-stage return structure)

[0208] Regarding the optical system UL of the above-mentioned embodiment, although it is a structure that is folded back once by the main reflector 12 and the sub-reflector 13 (single-stage folding), by becoming a structure that is folded back more than twice by the main reflector 12 and the sub-reflector 13 (multi-stage folding), the overall length (the distance in the optical axis direction from the correction plate 11 to the shooting surface I) can be further shortened, thereby further miniaturizing the camera modules 1 and 10.

[0209] Fig.17 (a) shows a case where a reflection pair consisting of a first main reflector 121 that reflects light transmitted through the correction plate 11 and a reflection surface of a first sub-reflector 131 that reflects light reflected by the first main reflector 121, and a reflection pair consisting of a second main reflector 122 that reflects light reflected by the first sub-reflector 131 and a reflection surface of a second sub-reflector 132 that reflects light reflected by the second main reflector 122 are respectively constructed as different components. In addition, Fig.17 (b) shows a case where the first main reflector 121 and the second main reflector 122 are formed as an integral part, and the first auxiliary reflector 131 and the second auxiliary reflector 132 are formed as an integral part. Fig.17 In case (b), the reflection surface of the first main reflector 121 and the reflection surface of the second main reflector 122 constitute a continuous surface, and the reflection surface of the first sub-reflector 131 and the reflection surface of the second sub-reflector 132 constitute a continuous surface. In addition, either the reflection surface of the first main reflector 121 and the reflection surface of the second main reflector 122, or the reflection surface of the first sub-reflector 131 and the reflection surface of the second sub-reflector 132 may constitute a continuous surface, and the other may constitute a discontinuous surface.

[0210] In addition, the optical system UL of the present embodiment preferably satisfies the following conditional expression (14).

[0211] 2.0 <Fno<15.0 (14)

[0212] in,

[0213] Fno: F value of the optical system UL

[0214] Conditional expression (14) shows the appropriate range of the F value of the optical system UL. In order to reliably obtain the effect of conditional expression (14), it is preferred that the upper limit value of conditional expression (14) is 13.0, and more preferably 10.0. In order to reliably obtain the effect of conditional expression (14), it is preferred that the lower limit value of conditional expression (14) is 3.0, and more preferably 4.0.

[0215] As described above, by multiplying the number of returns of the optical system UL (increasing the number of reflection surfaces), the degree of freedom of optical design can be increased. At this time, by using the second structure (light shielding component) for removing stray light, stray light can be removed even with multiple returns.

[0216] In addition, the conditions and structures described above each exert the above-mentioned effects, and are not limited to satisfying all the conditions and structures. The above-mentioned effects can be obtained even if any condition or structure is satisfied, or any combination of conditions or structures is satisfied.

[0217] Next, according to Fig.18 An optical device, that is, a camera, having the camera module 1 of this embodiment is described. The camera 60 is composed of the camera module 1 having the above-mentioned multi-eye structure, a control unit 20, a storage unit 30, an input unit 40, and a display unit 50. In addition, the control unit 20 is a calculation processing device such as a CPU. In addition, the storage unit 30 is a storage device such as a RAM or a hard disk or an SSD. In addition, if it is a camera, the input unit 40 is a shutter button, etc., and the display unit 50 is a liquid crystal display device, etc.

[0218] In the present camera 60, light from an object (subject) not shown in the figure is condensed by each optical system UL of the plurality of unit blocks 10 constituting the camera module 1, and a subject image is formed on the imaging surface of the imaging element 14. Then, the subject image is photoelectrically converted by the photoelectric conversion element provided in the imaging element 14, and an image signal of the subject is output. The image signal is output to the control unit 20. The control unit 20 includes a generation unit that generates one image based on a plurality of image signals output from the plurality of imaging elements 14. In addition, the generated image is displayed on the display unit 50 provided in the camera 60 by the control unit 20. In addition, when the photographer operates the input unit 40, after the image photoelectrically converted by the imaging element 14 is obtained by the control unit 20, a synthesis process is performed and the image is stored in the storage unit 30 as a synthesized image. Thus, the photographer can perform photography of the subject based on the present camera 60. In addition, the function of acquiring images from a plurality of imaging elements 14 to generate a composite image among the functions of the control unit 20 may be provided on the camera module 1 side, or may be provided on an external device to perform transmission and reception appropriately. In addition, the control unit 20 may also make the imaging conditions of each imaging element 14 different. As the imaging condition, for example, at least one of the imaging sensitivity, exposure time, exposure start time, and exposure end time may be cited. By making the imaging conditions different, the synthesized image can be closer to the image desired by the user.

[0219] The camera module 1 having such a multi-eye structure preferably satisfies the following conditional expression (15).

[0220] 0.30 <Nc / (Nd×n)<1.00 (15)

[0221] in,

[0222] Nd: Number of pixels of the image sensor 14

[0223] n: the number of imaging elements 14 used to generate the image

[0224] Nc: The number of pixels in the image

[0225] Conditional expression (15) shows an appropriate range of the ratio of the total number of pixels of the imaging elements 14 used for image generation (the product of the number of pixels of the imaging elements 14 of each unit block 10 and the number of unit blocks 10 used for image generation) to the number of pixels of the image synthesized from the images obtained by these imaging elements 14. In order to reliably obtain the effect of conditional expression (15), it is preferable that the lower limit value of conditional expression (15) is 0.40, and further 0.50. In order to reliably obtain the effect of conditional expression (15), it is preferable that the upper limit value of conditional expression (15) is 0.80, 0.70, and further 0.60.

[0226] The camera module 1 having such a multi-eye structure preferably satisfies the following conditional expression (16).

[0227] 0.50 <Nc / (Nd×√n)<2.00 (16)

[0228] in,

[0229] Nd: Number of pixels of the image sensor 14

[0230] n: the number of imaging elements 14 used to generate the image

[0231] Nc: The number of pixels in the image

[0232] Conditional expression (16) shows an appropriate range of the ratio of the total number of pixels of the imaging elements 14 used for generating the synthetic image to the number of pixels of the image synthesized from the images acquired by the imaging elements 14. In order to reliably obtain the effect of conditional expression (16), it is preferable that the lower limit value of conditional expression (16) is 0.70, 0.80, or further 1.00. In order to reliably obtain the effect of conditional expression (16), it is preferable that the upper limit value of conditional expression (16) is 1.90, 1.80, or further 1.70.

[0233] In addition, regarding the optical device (camera 60) having the camera module 10 with a single-lens structure, Fig.18 In the example, the unit block 10 corresponds to one structure, and in this case, the control unit 20 does not perform the synthesis process.

[0234] In addition, the above-mentioned optical device is not limited to a camera, and also includes an unmanned aerial vehicle, a portable terminal, an endoscope, etc. equipped with the camera modules 1 and 10 shown in this embodiment.

[0235] Below, refer to Fig.19The manufacturing method of the camera modules 1 and 10 of the present embodiment is briefly described. First, the first optical component 110 formed with the correction plate 11 and the secondary reflector 13, the second optical component 120 formed with the main reflector 12, the partition component 130, and the imaging component 140 configured with the imaging element 14 are prepared (step S100). Then, the optical system block 100 assembled with the first optical component 110, the second optical component 120, and the partition component 130 is configured (step S200), and the imaging component 140 is configured in such a manner that the multiple optical systems UL of the optical system block 100 are aligned with the imaging element 14 (step S300). Thus, the camera modules 1 and 10 are manufactured.

[0236] With the above-described structure, it is possible to provide a compact camera module 1 or 10 having high resolution and high optical performance, an optical device (camera 60 ) including the camera module 1 or 10 , and a method for manufacturing the camera module 1 or 10 .

[0237] [Example]

[0238] Hereinafter, various embodiments of the present application will be described with reference to the accompanying drawings. Fig. 20 , Fig. 22 , Fig.24 as well as Fig.26 It is a cross-sectional view showing the structure of the optical system UL (UL1 to UL4) according to the first to fourth embodiments.

[0239] In the first to tenth embodiments, when the height in the direction perpendicular to the optical axis is y, the distance along the optical axis from the tangent plane of the vertex of each aspherical surface at the height y to each aspherical surface (the amount of depression) is S(y), the radius of curvature of the reference spherical surface (paraxial radius of curvature) is r, the conic constant is K, and the n-order aspherical coefficient is An, the aspherical surface is represented by the following formula (b). In the following embodiments, "En" means "×10 -n ”.

[0240] S(y)=(y 2 / r) / {1+(1-K×y 2 / r 2 ) 1 / 2}+A2×y 2 +A4×y 4 +A6×y 6 +A8×y 8 (b)

[0241] In the tables of the examples, aspherical surfaces are indicated by an * on the right side of the surface numbers.

[0242] [First embodiment]

[0243] Fig. 20 1 is a diagram showing the configuration of the optical system UL1 according to the first embodiment. When converted to a 35 mm camera, the optical system UL1 has the configuration of the camera modules 1 and 10 whose focal length is 300 mm.

[0244] The optical system UL1 is composed of a correction plate 11, a first reflection surface 12a of a primary reflection mirror 12, a second reflection surface 13a of a secondary reflection mirror 13, and a refractive optical system 15 in the shape of a plano-convex lens with a convex surface facing the object side in the order in which light travels from the object side. In addition, the correction surface 11a is formed on the image side surface (second surface) of the correction plate 11.

[0245] Table 5 below shows the values ​​of the parameters of the optical system UL1. In Table 5, f in the overall parameters represents the focal length of the entire system, ω represents the half field angle, and TL represents the total length. In addition, the total length TL is the distance from the surface on the object side of the correction plate 11 (the first surface) to the image surface I in the direction of the optical axis incident on the image surface I. In addition, the first column m in the lens data shows the order of the lens surfaces from the object side along the direction of light travel (surface number), the second column r shows the radius of curvature of each lens surface, the third column d shows the distance on the optical axis from each optical surface to the next optical surface (surface spacing), and the fourth column nd and the fifth column νd show the refractive index and Abbe number for the d line (λ=587.6nm). In addition, the radius of curvature ∞ represents a plane, and the refractive index of air 1.00000 is omitted.

[0246] Here, although the focal length f, radius of curvature r, surface spacing d, and other length units recorded in all the following parameter values ​​are generally expressed in "mm", the same optical performance can be obtained even if the optical system is scaled up or scaled down, so it is not limited to this. In addition, the description of these symbols and the description of the parameter table are the same in the subsequent embodiments.

[0247] (Table 5) First embodiment

[0248] [Overall parameters]

[0249] f=20.58, ω=3.61°, TL=11.73, Fno=2.00

[0250] [Lens data]

[0251]

[0252] In the optical system UL1, the second surface, the third surface, the fourth surface, and the fifth surface are formed into aspherical shapes. The following Table 6 shows the data of the aspherical surface, that is, the values ​​of the cone constant K and the aspherical constants A2 to A8. In Table 6, m represents the surface number (the same also in the following embodiments).

[0253] (Table 6)

[0254] [Aspherical surface data]

[0255]

[0256] Table 7 below shows values ​​corresponding to each conditional expression in the optical system UL1.

[0257] (Table 7)

[0258] f1=22.75, RL=8.81, D2=6.20, fa=458.52, D0=11.52,

[0259] Y=1.31, fb=458.52, D1=10.60

[0260] (1) TL = 11.73

[0261] (2)ω=3.61°

[0262] (3) f / fa = 0.04

[0263] (4)f / fb=0.04

[0264] (5) M = 0.90

[0265] (6)f=20.58

[0266] (7) RL / TL = 0.75

[0267] (8) D1 / RL = 1.20

[0268] (9) D1 / D2=1.71

[0269] (10) D0 / Y=8.79

[0270] As described above, the optical system UL1 satisfies the above-mentioned conditional expressions (1) to (10).

[0271] Fig.21The spherical aberration diagram, astigmatism diagram, distortion diagram and coma diagram of the optical system UL1 are shown. In each aberration diagram, Y represents the image height, and ω represents the half field angle. In addition, the vertical axis of the spherical aberration diagram represents the aperture ratio relative to the maximum aperture, the vertical axes of the astigmatism diagram and the distortion diagram represent the image height, and the horizontal axis of the coma diagram represents the opening value in the exit pupil of each half field angle. D represents the d-line (λ=587.6nm), and g represents the g-line (λ=435.8nm). In the astigmatism diagram, the solid line represents the sagittal image plane, and the dotted line represents the meridional image plane. In addition, in the aberration diagrams of the various embodiments shown below, the same symbols as those of the present embodiment are also used. It can be seen from these aberration diagrams that the optical system UL1 of the first embodiment corrects each aberration well and has excellent imaging performance.

[0272] [Second embodiment]

[0273] Fig. 22 1 is a diagram showing the configuration of an optical system UL2 according to Example 2. When converted to a 35 mm camera, the optical system UL2 has the configuration of camera modules 1 and 10 whose focal length is 500 mm.

[0274] The optical system UL2 is composed of a correction plate 11, a first reflection surface 12a of a primary reflection mirror 12, a second reflection surface 13a of a secondary reflection mirror 13, and a refractive optical system 15 in the shape of a plano-concave lens with a concave surface facing the object side, in the order in which light rays travel from the object side. In addition, the correction surface 11a is formed on the image side surface (second surface) of the correction plate 11.

[0275] In the following Table 8, the values ​​of the parameters of the optical system UL2 are shown.

[0276] (Table 8) Second embodiment

[0277] [Overall parameters]

[0278] f=34.30, ω=2.16°, TL=12.00, Fno=4.00

[0279] [Lens data]

[0280]

[0281]

[0282] In the optical system UL2, the second surface, the third surface, and the fourth surface are formed into aspherical shapes. Table 9 below shows aspherical surface data, that is, the values ​​of the cone constant K and the aspherical constants A2 to A8.

[0283] (Table 9)

[0284] [Aspherical surface data]

[0285]

[0286] Table 10 below shows the corresponding values ​​of each conditional expression in the optical system UL2.

[0287] (Table 10)

[0288] f1=35.02, RL=9.09, D2=3.65, fa=590.84, D0=9.60,

[0289] Y=1.30, fb=590.84, D1=8.99

[0290] (1) TL = 12.00

[0291] (2)ω=2.16°

[0292] (3) f / fa = 0.06

[0293] (4)f / fb=0.06

[0294] (5) M = 0.98

[0295] (6)f=34.30

[0296] (7) RL / TL = 0.76

[0297] (8) D1 / RL = 0.99

[0298] (9) D1 / D2=2.46

[0299] (10) D0 / Y=7.38

[0300] As described above, the optical system UL2 satisfies the above-mentioned conditional expressions (1) to (10).

[0301] Fig.23 The spherical aberration diagram, astigmatism diagram, distortion diagram, and coma diagram of the optical system UL2 are shown. From these aberration diagrams, it can be seen that the optical system UL2 of the second example has corrected various aberrations well and has excellent imaging performance.

[0302] [Third embodiment]

[0303] Fig.24 1 is a diagram showing the configuration of an optical system UL3 according to Example 3. When converted to a 35 mm camera, the optical system UL3 has the configuration of camera modules 1 and 10 with a focal length of 1000 mm.

[0304] The optical system UL3 is composed of a correction plate 11, a first reflection surface 12a of a primary reflection mirror 12, a second reflection surface 13a of a secondary reflection mirror 13, and a refractive optical system 15 in the shape of a plano-concave lens with a concave surface facing the object side, in the order in which light rays travel from the object side. In addition, the correction surface 11a is formed on the image side surface (second surface) of the correction plate 11.

[0305] Table 11 below shows the values ​​of the parameters of the optical system UL3.

[0306] (Table 11) Example 3

[0307] [Overall parameters]

[0308] f=68.60, ω=1.09°, TL=15.00, Fno=8.00

[0309] [Lens data]

[0310]

[0311]

[0312] In the optical system UL3, the second surface, the third surface, and the fourth surface are formed into aspherical shapes. Table 12 below shows aspherical surface data, that is, the values ​​of the cone constant K and the aspherical constants A2 to A8.

[0313] (Table 12)

[0314] [Aspherical surface data]

[0315]

[0316] Table 13 below shows the corresponding values ​​of each conditional expression in the optical system UL3.

[0317] (Table 13)

[0318] f1=77.73, RL=12.09, D2=2.6, fa=1120.45, D0=10.39,

[0319] Y=1.30, fb=1120.45, D1=10.6

[0320] (1) TL = 15.00

[0321] (2)ω=1.09°

[0322] (3) f / fa = 0.06

[0323] (4)f / fb=0.06

[0324] (5) M = 0.88

[0325] (6)f=68.60

[0326] (7) RL / TL = 0.81

[0327] (8) D1 / RL = 0.88

[0328] (9) D1 / D2=4.08

[0329] (10) D0 / Y=7.99

[0330] As described above, the optical system UL3 satisfies the above-mentioned conditional expressions (1) to (10).

[0331] Fig.25 The spherical aberration diagram, astigmatism diagram, distortion diagram, and coma diagram of the optical system UL3 are shown. From these aberration diagrams, it can be seen that the optical system UL3 of the third example has corrected various aberrations well and has excellent imaging performance.

[0332] [Fourth embodiment]

[0333] Fig.26 1 is a diagram showing the configuration of an optical system UL4 according to Example 4. When converted to a 35 mm camera, the optical system UL4 has the configuration of camera modules 1 and 10 with a focal length of 300 mm.

[0334] The optical system UL4 is composed of the correction plate 11, the first reflection surface 12a of the primary mirror 12, and the second reflection surface 13a of the secondary mirror 13 in the order of light travel from the object side. The correction surface 11a is formed on the object side surface (first surface) of the correction plate 11.

[0335] Table 14 below shows the values ​​of the parameters of the optical system UL4.

[0336] (Table 14) Example 4

[0337] [Overall parameters]

[0338] f=19.71, ω=0.87°, TL=6.00, Fno=5.00

[0339] [Lens data]

[0340]

[0341] In the optical system UL4, the first surface is formed into an aspherical shape. Table 15 below shows data of the aspherical surface, that is, the values ​​of the cone constant K and the aspherical constants A2 to A8.

[0342] (Table 15)

[0343] [Aspherical surface data]

[0344]

[0345] Table 16 below shows the corresponding values ​​of each conditional expression in the optical system UL4.

[0346] (Table 16)

[0347] f1=22.89, RL=3.46, D2=0.90, fa=545.33, D0=4.11,

[0348] Y=0.31, fb=545.33, D1=4.00

[0349] (1) TL = 6.00

[0350] (2)ω=0.87°

[0351] (3) f / fa = 0.04

[0352] (4)f / fb=0.04

[0353] (5) M = 0.86

[0354] (6)f=19.71

[0355] (7) RL / TL = 0.58

[0356] (8) D1 / RL = 1.16

[0357] (9) D1 / D2=4.44

[0358] (10) D0 / Y=13.26

[0359] As described above, the optical system UL4 satisfies the above-mentioned conditional expressions (1) to (10).

[0360] Fig. 27 The spherical aberration diagram, astigmatism diagram, distortion diagram, and coma diagram of the optical system UL4 are shown. From these aberration diagrams, it can be seen that the optical system UL4 of the fourth example corrects various aberrations well and has excellent imaging performance.

[0361] The fifth to seventh embodiments described below are cases where the optical system UL is constructed by a compact Schmidt-Cassegrain method. Fig.28 It is a cross-sectional view of the optical system UL constituting the camera modules 1 and 10 of the fifth to seventh embodiments.

[0362] (Fifth embodiment)

[0363] The fifth embodiment is a case where the optical system UL is constructed by the compact Schmidt-Cassegrain method, and the focal length of the camera modules 1 and 10 is 500 mm when converted to a 35 mm camera. The image sensor 14 is a 1 / 6 inch image sensor with 2 million pixels and a size of 2.4 mm×1.8 mm.

[0364] Table 17 below shows the parameters of the optical system UL in Example 5. Here, f1 represents the focal length of the main reflector 12, r1 represents the radius of curvature of the main reflector 12, f2 represents the focal length of the sub-reflector 13, r2 represents the radius of curvature of the sub-reflector 13, f represents the focal length of the entire system, R represents the distance on the optical axis from the sub-reflector 13 to the main reflector 12, D represents the distance on the optical axis from the surface of the correction plate 11 closest to the object side to the main reflector 12, TL represents the total length, that is, the distance on the optical axis from the surface of the correction plate 11 closest to the object side to the image plane I, FNo represents the F value, and M represents the secondary zoom ratio.

[0365] (Table 17) Example 5 - Optical System UL

[0366] f1=6.12, r1=12.24, f2=0.75, r2=1.50, f=34.3,

[0367] R=5.5, D=6.0, TL=9.4, FNO=5.7, M=5.60

[0368] In addition, the following Table 18 shows the parameters of the camera module 1 having a multi-eye structure composed of 9 3×3 optical systems UL. In addition, the composite F value is the F value of the image obtained by synthesizing the images based on the 9 optical systems UL. Since it is composed of 3×3 optical systems UL, the overall F value (composite F value) becomes 1 / 3 of the F value of each optical system UL. In addition, the size represents the length in the horizontal × vertical × depth direction (optical axis direction) when the camera module 1 is observed from the object side. In addition, the magnification (zoom) represents the focal length when converted to a 35mm camera in the telephoto end state and the wide-angle end state.

[0369] (Table 18) Fifth embodiment - Camera module 1

[0370]

[0371] As described above, by making the optical system UL of the camera modules 1 and 10 a compact Schmidt-Cassegrain system, it becomes a telephoto optical system with a focal length of 500 mm when converted to a 35 mm camera, and the total length can be made much shorter than the focal length. In addition, since it is a compact Schmidt-Cassegrain system, it can be an aplanatic optical system (an optical system without spherical aberration, coma, and astigmatism). In addition, it is possible to realize a multi-eye camera module 1 with a thickness (length in the optical axis direction) less than 10 mm.

[0372] (Sixth embodiment)

[0373] The sixth embodiment is a case where the optical system UL is constructed by the compact Schmidt-Cassegrain method, and the focal length of the camera modules 1 and 10 is 300 mm when converted to a 35 mm camera. In addition, the imaging element 14 is a 1 / 6 inch imaging element with 2 million pixels and a size of 2.4 mm×1.8 mm, similar to the fifth embodiment.

[0374] Table 19 below shows the parameters of the optical system UL in the sixth embodiment.

[0375] (Table 19) Example 6 - Optical System UL

[0376] f1=3.67, r1=7.34, f2=0.45, r2=0.90, f=20.6,

[0377] R=3.3, D=3.6, TL=5.64, FNO=3.4, M=5.61

[0378] Table 20 below shows parameters of the camera module 1 having a multi-eye structure including nine 3×3 cameras constituting the optical system UL.

[0379] (Table 20) Example 6 - Camera Module 1

[0380]

[0381] As described above, by making the optical system UL of the camera modules 1 and 10 a compact Schmidt-Cassegrain system, it becomes a telephoto optical system with a focal length of 300 mm when converted to a 35 mm camera, and the total length can be made much shorter than the focal length. In addition, since it is a compact Schmidt-Cassegrain system, it can be an aplanatic optical system (an optical system without spherical aberration, coma, and astigmatism). In addition, it is possible to realize a camera module 1 with a thickness (length in the optical axis direction) less than 10 mm.

[0382] (Seventh embodiment)

[0383] The seventh embodiment is a case where the optical system UL is constructed by a compact Schmidt-Cassegrain method, and the focal length of the camera modules 1 and 10 is 1000 mm when converted to a 35 mm camera. In addition, the image sensor 14 is a 1 / 6 inch image sensor with 2 million pixels, and its size is 2.4 mm×1.8 mm, similar to the fifth embodiment.

[0384] The following Table 21 shows the parameters of the optical system UL in the seventh embodiment.

[0385] (Table 21) Example 7 - Optical System UL

[0386] f1=12.24, r1=24.5, f2=1.50, r2=3.00, f=68.6,

[0387] R=11.0, D=12.0, TL=18.8, FNO=11.4, M=5.60

[0388] Table 22 below shows parameters of the camera module 1 having a multi-eye structure composed of nine 3×3 cameras constituting the optical system UL described above.

[0389] (Table 22) Embodiment 7 - Camera Module 1

[0390]

[0391] As described above, by making the optical system UL of the camera module 1 a compact Schmidt-Cassegrain system, it becomes a telephoto optical system with a focal length of 1000 mm when converted to a 35 mm camera, and the total length can be made much shorter than the focal length. In addition, since it is a compact Schmidt-Cassegrain system, it can be an aplanatic optical system (an optical system without spherical aberration, coma, and astigmatism). In addition, it is possible to realize a camera module 1 with a thickness (length in the optical axis direction) less than 20 mm.

[0392] (Reference example)

[0393] As a reference example, the following Table 23 shows the parameters of the optical system UL when the optical system UL is constructed by the Schmidt-Cassegrain method and the focal length is 300 mm when converted to a 35 mm camera. In this reference example, the image sensor 14 is also a 2 million pixel 1 / 6 inch image sensor, similar to the fifth embodiment, and its size is 2.4 mm×1.8 mm.

[0394] (Table 23) Reference example

[0395] f1=14.3, r1=28.6, f2=14.3, r2=28.6, f=24.0,

[0396] R=10.0, D=14.3, TL=15.9

[0397] When the optical system UL is constructed by the Schmidt-Cassegrain method, it becomes a telephoto optical system with a focal length of 300 mm when converted to a 35mm camera, and the total length can be made shorter than the focal length, and an optical system with no field curvature, that is, a Petzval sum of 0, can be constructed. However, compared with the compact Schmidt-Cassegrain method, the total length becomes longer.

[0398] As described above, according to the camera modules 1 and 10 of the present embodiment, a plurality of compact Schmidt-Cassegrain optical systems UL are arranged in an array, thereby providing a telephoto camera module having high resolution and being thin (small in size in the optical axis direction).

[0399] As described above, the camera modules 1 and 10 of the present embodiment can form a plurality of correction plates 11, a plurality of main reflectors 12, and a plurality of sub-reflectors 13 on each of the two planar optical components (parallel plane glass plates 111 and 121) by embossing or mask coating, and can be completed by combining the first optical component 110, the second optical component 120, and the partition component 130 one by one. Therefore, the camera modules 1 and 10 of the present embodiment do not need to adjust the positions of each other after forming a plurality of optical systems to form an optical system block, but can be manufactured through a simple process. In addition, a shooting component 140 composed of a plurality of shooting elements 14 can be combined with the optical system block 100, and it is not necessary to adjust the position of the optical system and the shooting element for each individual, and can be manufactured through a simpler process. In addition, since it is difficult to generate errors relative to the positions of the plurality of shooting elements 14 after manufacturing, it can be a camera module 1 that can synthesize a plurality of images and perform high-resolution photography.

[0400] Here, the number of correction plates 11 included in the first optical component 110 is equal to the number of secondary reflectors 13. In addition, the number of secondary reflectors 13 included in the first optical component 110 is equal to the number of primary reflectors 12 included in the second optical component 120. In addition, the number of optical systems UL included in the optical system block 100 is equal to the number of optical systems UL that can be isolated by the partition wall component 130.

[0401] In addition, although the correction plate 11 is provided in this embodiment, it is not limited to this, and the correction plate 11 may not be provided and the upper surface of the parallel plane glass plate 111 may be left as it is. In addition, in this embodiment, the correction plate 11 and the secondary reflector 13 are not integrated but separated, and the position of the correction plate 11 is not limited to this. In addition, the shape of the correction plate 11 is not particularly limited and can be appropriately changed.

[0402] In addition, although the secondary reflector 13 and the primary reflector 12 are provided on the parallel plane glass plates 111 and 121 respectively in this embodiment, the shape and material of the glass plates are not limited and they may not be parallel or planar, but may be plate members made of resin materials.

[0403] In addition, the method of forming the main reflector 12, the secondary reflector 13, etc. can be appropriately changed. Although they are combined after the first optical component 110 and the second optical component 120 are formed, the first optical component 110, the second optical component 120 and the partition component 130 can also be formed in sequence on the surface of the plate component serving as a reference.

[0404] The top view shape of the area separated by the partition member 130 (the shape when the optical system UL is observed along the direction of the optical axis incident on the imaging element 14) is preferably the same as the top view shape of the imaging element 14. For example, when the top view shape of the imaging element 14 is a rectangle, it is preferred that the top view shape of the area separated by the partition member 130 is also a rectangle. In addition, the top view shape of the main reflector 12 and the top view shape of the sub-reflector 13 can also be appropriately changed, and preferably, they are the same as the top view shape of the imaging element 14. The top view shapes of the opening 12b, the correction plate 11, and the refractive optical system 15 can also be appropriately changed, and preferably, they are the same as the top view shape of the imaging element 14.

[0405] In this embodiment, although the partition wall component 130 is provided as an opaque component, it can be appropriately changed as long as it can suppress the light of the optical system UL from being incident on the adjacent optical system UL. For example, it can also be a diffusion component such as frosted glass. In addition, the opaque component does not need to completely suppress the incidence of light, as long as it can suppress the incidence of light to a degree that does not affect the imaging element 14 (for example, 20% of the incident light).

[0406] In addition, in the camera module 1 of the multi-eye structure of the present embodiment, although the nine optical systems UL are all the same, it is also possible to combine multiple optical systems with different optical characteristics such as focal length, shooting distance or F value as one optical device. In this case, when at least one compact Schmidt-Cassegrain optical system as in the present embodiment is provided, it is preferable to be able to perform photography at a telephoto distance.

[0407] In addition, when combining multiple optical systems UL with different optical characteristics, the shape of a part of the 9 main mirrors (or sub-mirrors) can be changed, the focal length of a part of the 9 correction plates can be changed, and refractive optical systems with different focal lengths can be configured in the 9 optical systems UL respectively.

[0408] In addition, in the multi-eye camera module 1, at least one of the nine optical systems UL may be an illumination optical system. In this case, only the imaging element 14 of the optical system UL of this embodiment may be replaced with an illumination unit such as an LED, and the reflector and the correction plate may be omitted in the area where the light from the illumination unit is incident.

[0409] In the multi-eye camera module 1 , the nine optical systems UL move as a whole when focusing or the like is performed, but at least a part of the optical systems UL may move so as to change the distance between the optical system UL and the image sensor 14 .

[0410] (Optical system UL is an integrated structure)

[0411] In the above structure, if Figure 6 As shown in FIG. 1 , although the first optical component 110 and the second optical component 120 are described as being formed as separate individual bodies, it is also possible to Fig.29 As shown, a medium (a transmissive component having a refractive index) for transmitting light is filled between the first optical component 110 and the second optical component 120 to form an optical component 171, and a correction surface 11a, a first reflection surface 12a, and a second reflection surface 13a are provided on the optical component 171 to form an integrated lens 170 that makes the optical system UL integrated. In addition, the stray light removal component (the partition wall component 130) can be omitted in the integrated lens 170.

[0412] Specifically, if Fig.29 As shown, the optical component 171 includes: a first surface 171a, which is an incident surface for light from an object to be incident and is formed with a correction surface 11a; a second surface 171b, which is formed with a first reflecting surface 12a for reflecting light incident through the first surface 171a; a third surface 171c, which is formed with a second reflecting surface 13a for reflecting light incident from the first reflecting surface 12a; and a fourth surface 171d as an emitting surface, and the light reflected from the second reflecting surface 13a is emitted from the optical component 171 toward the imaging element 14.

[0413] In the optical component 171, although the first surface 171a can be a plane or a surface with a curvature, it is preferably a shape with a concave surface facing the object side. In addition, although the fourth surface 171d can be a plane or a surface with a curvature, it is preferably a shape with a convex surface facing the object side. Regarding the fourth surface 171d, in the case of a surface with a curvature, it functions as the above-mentioned refractive optical system 15.

[0414] In addition, it is preferred that the inner diameter side of the straight line (hereinafter referred to as "first straight line 171e") connecting the edge on the inner side of the inner diameter of the second surface 171b forming the first reflecting surface 12a and the edge on the outer side of the outer diameter of the fourth surface 171d is an air portion (concave shape, concave portion) 171f.

[0415] Although the first surface 171a, the second surface 171b, the third surface 171c, the fourth surface 171d, and the imaging surface I of the imaging element 14 are arranged in this order on the optical path, when the integrated lens 170 is observed from the horizontal direction (the direction perpendicular to the optical axis), the third surface 171c, the first surface 171a, the fourth surface 171d, the second surface 171b, and the imaging surface I are arranged in this order. The first surface 171a and the fourth surface 171d are preferably arranged between the second surface 171b and the third surface 171c. Therefore, when the integrated lens 170 is observed from the horizontal direction, the center is a surface concave toward the object side, and the convex portion (the third surface 171c and the protruding portion between the second reflecting surface 13a and the first surface 171a) 171g where the second reflecting surface 13a is formed on the image side is arranged at the position closest to the object side.

[0416] Preferably, at least a portion of the outer edge of the air portion 171f, the outer edge of the convex portion 171g, and the outer edge of the integrated lens 170 connecting the first surface 171a and the second surface 171b is painted black so as to have a stray light removal function. The outer edge of the integrated lens 170 may have a stray light removal function on the side closest to the object, but not on the side closest to the image (in other words, only a portion may be painted black).

[0417] In addition, for the purpose of molding and holding the lens, the outer edge of the integrated lens 170 and the outer edge of the convex portion 171g are preferably stepped. Furthermore, in order to remove stray light, it is preferred that at least a portion of the outer edge of the integrated lens 170 and the outer edge of the convex portion 171g have an inclined surface that is inclined in a direction away from the optical axis as it approaches the imaging surface.

[0418] Regarding the optical component 171, it is preferred to fill a resin material between the first surface 171a and the second surface 171b. In addition, regarding the resin material of the optical component 171, it is preferred to use a material with zero or substantially zero birefringence (for example, a material with zero or substantially zero in-plane phase difference Re, thickness phase difference Rth, and photoelastic coefficient C).

[0419] The optical system UL of the integrated lens 170 described above preferably satisfies the following conditional expression (17).

[0420] 0.5<(h1in / d1-i) / (h4 / d4-i)<10.0(17)

[0421] in,

[0422] h1in: Inner diameter of the refractive surface (first surface 171a) located closest to the object

[0423] d1-i: The distance between the optical axis center of the refractive surface (first surface 171a) located closest to the object and the image plane

[0424] h4: The outer diameter of the refractive surface (the fourth surface 171d) located closest to the image plane

[0425] d4-i: The distance between the optical axis center of the refractive surface (the fourth surface 171d) located closest to the image plane and the image plane

[0426] Conditional expression (17) specifies the appropriate relationship between the first surface 171a, which is the refractive surface located closest to the object side and serves as the incident surface, and the fourth surface 171d, which is the refractive surface located closest to the image plane side and serves as the emission surface, in the integrated lens 170. When the lower limit value of conditional expression (17) is lower than the lower limit value, stray light that does not pass through the reflection surface reaches the image plane, so it is not preferred. In addition, in order to reliably obtain the effect of the conditional expression (17), it is more preferred to set the lower limit value of conditional expression (17) to 0.6, and further to 0.7. In addition, when the upper limit value of conditional expression (17) is exceeded, the dark angle of the peripheral part of the signal light becomes larger and the resolution decreases, so it is not preferred. In addition, in order to reliably obtain the effect of conditional expression (17), it is more preferred to set the upper limit value of conditional expression (17) to 7.0, and further to 5.0.

[0427] In addition, the above-mentioned integrated lens 170 preferably satisfies the following conditional expression (18).

[0428] 50.0<νd (18)

[0429] in,

[0430] νd: Abbe number of the medium of the integrated lens 170 (the medium of the optical component 171) for the d-line

[0431] The conditional expression (18) specifies an appropriate value of the Abbe number for the d-line of the medium of the optical component 171 constituting the integrated lens 170. If the lower limit of the conditional expression (18) is exceeded, the chromatic aberration of the integrated lens 170 deteriorates, which is not preferred. In order to reliably obtain the effect of the conditional expression (18), it is more preferred to set the lower limit of the conditional expression (18) to 54.0, or further to 60.0.

[0432] In addition, the optical system UL of the integrated lens 170 described above preferably satisfies the following conditional expression (19).

[0433] 0.1 <r4 / TL3<10.0 (19)

[0434] in,

[0435] r4: The curvature radius of the refractive surface (the fourth surface 171d) located closest to the image plane

[0436] TL3: The distance between the reflection surface (third surface 171c) located closest to the object and the image plane

[0437] Conditional expression (19) specifies the ratio of the radius of curvature of the refractive surface (4th surface 171d) located closest to the image plane to the total length of the integrated lens 170 (the interval between the reflective surface (3rd surface 171c) located closest to the object side and the image plane). When the value is lower than the lower limit of conditional expression (19), chromatic aberration and Petzval sum deteriorate, so it is not preferred. In addition, in order to reliably obtain the effect of the conditional expression (19), it is more preferred to set the lower limit of conditional expression (19) to 0.15, and further to 0.2. In addition, when the upper limit of conditional expression (19) is exceeded, it is difficult to correct off-axis aberrations, so it is not preferred. In addition, in order to reliably obtain the effect of conditional expression (19), it is more preferred to set the upper limit of conditional expression (19) to 7.0, and further to 5.0.

[0438] [Example]

[0439] The eighth to tenth embodiments described below are embodiments of the integrated lens 170. Fig.30 , Fig.32 as well as Fig.34 The optical systems UL (UL8 to UL10) of the integrated lens 170 in the eighth to tenth embodiments are shown. Fig.29 In the optical component 171, 1 represents the first surface 171a, 2 represents the first reflecting surface 12a (the second surface 171b), 3 represents the second reflecting surface 13a (the third surface 171c), and 4 represents the fourth surface 171d.

[0440] In each example, the aspheric surface is represented by the above-mentioned formula (b). In addition, in each example, the quadratic aspheric coefficient A2 is 0. In addition, in the table of each example, the aspheric surface is marked with an * on the right side of the surface number.

[0441] (Eighth Embodiment)

[0442] Fig.30The optical system UL8 of the integrated lens 170 in the eighth embodiment is shown. The values ​​of the parameters of the optical system UL8 are shown in Table 24 below. In Table 24, f in the overall parameters represents the focal length of the entire system, ω represents the half field angle, FNO represents the F value, Y represents the maximum image height, Bf represents the back focal length, and TL3 represents the total length. Here, as described above, the total length TL3 represents the distance on the optical axis from the third surface to the image surface I. In addition, the back focal length Bf represents the distance from the optical surface closest to the image side ( Fig.29 The distance on the optical axis from the second surface in the image plane to the image plane I.

[0443] (Table 24) Example 8

[0444] [Overall parameters]

[0445] f=21.970, ω(°)=4.087, FNO=2.0, Y=1.6,

[0446] BF=2.4000,TL3=9.0000

[0447] [Lens data]

[0448]

[0449] In the optical system UL8, each of the first, second, third and fourth optical surfaces is formed into an aspherical shape. Table 25 below shows aspherical surface data, that is, the values ​​of the cone constant K and the aspherical constants A4 to A6 for each surface m.

[0450] (Table 25)

[0451] [Aspherical surface data]

[0452]

[0453] Table 26 below shows the corresponding values ​​of each conditional expression in the optical system UL8.

[0454] (Table 26)

[0455] h1in=3.19, d1-i=7.80, h4=1.75, d4-i=5.80,

[0456] (17)(h1in / d1-i) / (h4 / d4-i)=1.355

[0457] (18)νd=57.07

[0458] (19)r4 / TL3=2.111

[0459] As described above, the optical system UL8 satisfies all of the above conditional expressions (17) to (19).

[0460] Fig.31 The spherical aberration diagram, astigmatism diagram, distortion diagram, and coma diagram of the optical system UL8 of the integrated lens 170 of Example 8 are shown. From these aberration diagrams, it can be seen that the optical system UL8 corrects various aberrations well and has excellent imaging performance.

[0461] (Ninth embodiment)

[0462] Fig.32 The optical system UL9 of the integrated lens 170 in the ninth embodiment is shown. Table 27 below shows the parameter values ​​of the optical system UL9.

[0463] (Table 27) 9th embodiment

[0464] [Overall parameters]

[0465] f=40.000, ω(°)=2.259, FNO=3.5, Y=1.6,

[0466] BF=3.0500,TL3=11.0000

[0467] [Lens data]

[0468]

[0469] In the optical system UL9, each of the first, second, third and fourth optical surfaces is formed into an aspherical shape. Table 28 below shows aspherical surface data, that is, the values ​​of the cone constant K and the aspherical constants A4 to A6 for each surface m.

[0470] (Table 28)

[0471] [Aspherical surface data]

[0472]

[0473] Table 29 below shows the corresponding values ​​of each conditional expression in the optical system UL9.

[0474] (Table 29)

[0475] h1in=3.50, d1-i=8.00, h4=1.75, d4-i=8.05

[0476] (17)(h1in / d1-i) / (h4 / d4-i)=2.013

[0477] (18)νd=57.75

[0478] (19) r4 / TL3=0.590

[0479] As described above, the optical system UL9 satisfies all of the above conditional expressions (17) to (19).

[0480] Fig.33 The spherical aberration diagram, astigmatism diagram, distortion diagram, and coma diagram of the optical system UL9 of the integrated lens 170 of Example 9 are shown. From these aberration diagrams, it can be seen that the optical system UL9 corrects various aberrations well and has excellent imaging performance.

[0481] (10th embodiment)

[0482] Fig.34 The optical system UL10 of the integrated lens 170 in the tenth embodiment is shown. Table 30 below shows the parameter values ​​of the optical system UL10.

[0483] (Table 30) Example 10

[0484] [Overall parameters]

[0485] f=60.000, ω(°)=1.489, FNO=6.0, Y=1.6,

[0486] BF=5.0000,TL3=13.0000

[0487] [Lens data]

[0488]

[0489] In the optical system UL10, each of the first, second, third and fourth optical surfaces is formed into an aspherical shape. Table 31 below shows aspherical surface data, that is, the values ​​of the cone constant K and the aspherical constants A4 to A6 for each surface m.

[0490] (Table 31)

[0491] [Aspherical surface data]

[0492]

[0493] Table 32 below shows the corresponding values ​​of each conditional expression in the optical system UL10.

[0494] (Table 32)

[0495] h1in=2.00, d1-i=1.30, h4=1.10, d4-i=6.00

[0496] (17)(h1in / d1-i) / (h4 / d4-i)=0.839

[0497] (18)νd=64.13

[0498] (19) r4 / TL3=0.302

[0499] As described above, the optical system UL10 satisfies all of the above conditional expressions (17) to (19).

[0500] Fig.35 The spherical aberration diagram, astigmatism diagram, distortion diagram, and coma diagram of the optical system UL10 of the integrated lens 170 of Example 10 are shown. From these aberration diagrams, it can be seen that the optical system UL10 corrects various aberrations well and has excellent imaging performance.

[0501] Description of symbols

[0502] 1. 10-camera module (camera device) UL optical system

[0503] 11 calibration plate (calibration component) 11a calibration surface

[0504] 12 Main reflector (first reflector) 13 Secondary reflector (second reflector)

[0505] 14 imaging element 16 first polarizing plate (first polarizing member)

[0506] 17 wavelength film (polarization direction rotating component) 18 second polarizing plate (second polarizing component)

[0507] 19 Prevention Department

Claims

1. A photographing device, comprising: An optical system including a first reflecting portion for reflecting incident light and a second reflecting portion for receiving the light reflected by the first reflecting portion and reflecting the light; an imaging element disposed on the image side relative to the optical system, into which the light reflected by the second reflecting portion is incident, and which captures an image of the object formed by the optical system; as well as a light shielding member disposed on at least one of the optical axis side of the optical system of the light reflected by the first reflecting portion and the side opposite to the optical axis of the optical system of the light reflected by the second reflecting portion, The light shielding member includes at least one of a first light shielding member formed to protrude from the first reflecting portion toward the second reflecting portion and a second light shielding member formed to protrude from the second reflecting portion toward the first reflecting portion. The cross-sectional shape of the second light shielding member in the optical axis direction is such that an angle formed by a surface on the optical axis side and a surface perpendicular to the optical axis is smaller than an angle formed by a surface on the side opposite to the optical axis and a surface perpendicular to the optical axis. The optical system has a correction component at a position closest to the object side, and the correction component has a correction surface that is a high-order aspheric surface. The correction component and the second reflecting portion are respectively formed on two surfaces of a parallel plane glass plate, wherein the correction component is formed on the object side surface of the parallel plane glass plate, and the second reflecting portion is formed on the image side surface of the parallel plane glass plate.

2. A photographing device, comprising: An optical system including a first reflecting portion for reflecting incident light and a second reflecting portion for receiving the light reflected by the first reflecting portion and reflecting the light; an imaging element disposed on the image side relative to the optical system, into which the light reflected by the second reflecting portion is incident, and which captures an image of the object formed by the optical system; as well as a light shielding member disposed on at least one of the optical axis side of the optical system of the light reflected by the first reflecting portion and the side opposite to the optical axis of the optical system of the light reflected by the second reflecting portion, The light shielding member includes at least one of a first light shielding member formed to protrude from the first reflecting portion toward the second reflecting portion and a second light shielding member formed to protrude from the second reflecting portion toward the first reflecting portion. The optical system has a correction component at a position closest to the object side, the correction component has a correction surface that is a high-order aspheric surface, the correction component and the second reflecting portion are respectively formed on two surfaces of a parallel plane glass plate, wherein the correction component is formed on the object side surface of the parallel plane glass plate, and the second reflecting portion is formed on the image side surface of the parallel plane glass plate. The second light shielding component satisfies the following condition: 1.0<θ2s / θ1s<2.0 in, θ1s: Angle between the surface of the second light shielding member on the optical axis side and the surface perpendicular to the optical axis θ2s: An angle formed between a surface of the second light shielding member on the side opposite to the optical axis and a surface perpendicular to the optical axis.

3. The photographing device according to claim 1 or 2, wherein: An optical axis of the first reflecting portion coincides with an optical axis of the second reflecting portion.

4. The photographing device according to claim 1 or 2, wherein: The light shielding member is formed to surround the optical axis when viewed from the optical axis direction.

5. The photographing device according to claim 1 or 2, wherein: The second reflecting portion is arranged in a first area centered on the optical axis of the optical system. The first reflecting portion is arranged so as to surround a second region centered on the optical axis of the optical system.

6. The photographing device according to claim 5, wherein: The first reflecting portion is in the shape of a ring centered on the optical axis. The second reflecting portion is a circle centered on the optical axis.

7. The photographing device according to claim 5, wherein: The light shielding member includes at least one of a first light shielding member disposed on an inner peripheral portion of the first reflecting portion and a second light shielding member disposed on an outer peripheral portion of the second reflecting portion.

8. The photographing device according to claim 1 or 2, wherein: The second light shielding member has a cross-sectional shape in the optical axis direction such that an inner diameter increases from the second reflecting portion toward the first reflecting portion.

9. The photographing device according to claim 1 or 2, wherein: The second light shielding component satisfies the following condition: 30°<θ2s<90° in, θ2s: An angle formed between a surface of the second light shielding member on the side opposite to the optical axis and a surface perpendicular to the optical axis.

10. The photographing device according to claim 1 or 2, wherein: The cross-sectional shape of the first light shielding member in the optical axis direction is such that the inner diameter becomes smaller as it goes from the first reflecting portion toward the second reflecting portion.

11. The photographing device according to claim 10, wherein: The cross-sectional shape of the first light shielding member in the optical axis direction is such that an angle between a surface on the optical axis side and a surface perpendicular to the optical axis is smaller than an angle between a surface on the side opposite to the optical axis and a surface perpendicular to the optical axis.

12. The photographing device according to claim 10, wherein: The first light shielding component satisfies the following condition: 30°<θ2m<90° in, θ2m: An angle formed between a surface of the first light shielding member on the side opposite to the optical axis and a surface perpendicular to the optical axis.

13. The photographing device according to claim 1 or 2, wherein: Each of the imaging devices includes a plurality of the optical systems and a plurality of the imaging elements.

14. The photographing device according to claim 1 or 2, wherein: Satisfy the following conditions: 0.5<(h1in / d1-i) / (h4 / d4-i)<10.0 in, h1in: The inner diameter of the refractive surface of the optical system located closest to the object d1-i: The distance between the center of the optical axis of the refractive surface of the optical system located closest to the object and the image plane h4: The outer diameter of the refractive surface of the optical system located closest to the image plane d4-i: The distance between the optical axis center of the refractive surface of the optical system located closest to the image plane and the image plane.

15. The photographing device according to claim 1 or 2, wherein: The medium from the incident surface to the emitting surface of the optical system is the same material, And satisfy the following conditions: 50.0<νd in, νd: Abbe number of the medium of the optical system for the d-line.

16. The photographing device according to claim 1 or 2, wherein: Satisfy the following conditions: 0.1 <r4 / TL3<10.0 in, r4: The radius of curvature of the refractive surface of the optical system located closest to the image plane TL3: The distance between the reflection surface of the optical system located closest to the object and the image plane.

Images