Imaging apparatus

Abstract

To provide an imaging apparatus that inhibits an optical axis of a lens from being displaced by temperature change.SOLUTION: The imaging apparatus comprises: a first holder 21 including a first storage part 210 storing a first lens 11 and a first base part 212 extending in a direction orthogonal to an optical axis O1 of the first lens 11; a first image pick-up device 41; a housing 60 storing a first base part 212 and the first image pick-up device 41; and a first fixing member 71 bringing the first base part 212 and the housing 60 into contact with the optical axis O1 direction and fixing them. The first fixing member 71 includes a first head 710 holding the housing 60 with the first base part 212. The housing 60 has a linear expansion coefficient different from that of the first fixing member 71. Length Lb1 of the first base part 212 in the optical axis O1 direction is configured to be longer than length Lh1 of the housing 60 in the optical axis O1 direction.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to an imaging device. [Background technology]

[0002] As described in Patent Document 1, a camera device including a camera case and a camera module has been known. The camera case is fixed to the windshield of a vehicle from inside the vehicle cabin. The camera module includes an optical unit with a lens and a camera board with an imaging element fixed to an end of the optical unit, and is fixed to the camera case. The optical unit includes a lens barrel that holds the lens therein and a base that has a reference surface that serves as a reference for positioning when fixing the camera module to the camera case and to which the lens barrel is fixed. In addition, the camera case and the camera module are fixed by fixing the left and right inner walls of the camera case to the base with screws. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-158098 Summary of the Invention [Problem to be solved by the invention]

[0004] In a camera device such as that described in Patent Document 1, the linear expansion coefficient of the camera module may differ from that of the screw. If the linear expansion coefficients of the camera module and the screw differ, thermal stress may occur in the camera case, camera module, and screw due to temperature changes in the camera module and the screw, or the fixing force between the screw and the camera module may decrease. The generated thermal stress or the decrease in fixing force may change the attitude of the camera module. If the attitude of the camera module changes, the optical axis of the lens may shift, causing a shift in the imaging range of the camera device.

[0005] The present disclosure aims to provide an imaging device that suppresses deviation of the optical axis of a lens caused by temperature changes. [Means for solving the problem]

[0006] The invention described in claim 1 is an imaging device comprising: a holder (21) having a lens (11), a storage section (210) that stores the lens, and a base section (212) that is connected to the storage section and extends in a direction perpendicular to the optical axis (O1) of the lens; an imaging element (41) that outputs a signal corresponding to an image captured based on light that has passed through the lens; a housing (60) that stores the base section and the imaging element; and a fixing member (71) that brings the base section and the housing into contact in the direction of the optical axis and fixes the base section and the housing, wherein the fixing member has a head (710) that sandwiches the housing with the base section, the linear expansion coefficient of the housing and the linear expansion coefficient of the fixing member are different, and the length (Lb1) in the direction of the optical axis from the part of the base section that is in contact with the housing to the end (214) opposite the part that is in contact with the housing is longer than the length (Lh1) in the direction of the optical axis from the part of the housing that is in contact with the head section to the part of the housing that is in contact with the base section.

[0007] This makes the length of the portion of the housing fixed by the fixing member relatively short, which prevents the housing from expanding or contracting as the temperature changes. This prevents the increase in thermal stress generated in the housing and the decrease in the fixing force between the housing and the fixing member. This prevents the misalignment of the optical axis caused by temperature changes.

[0008] The reference symbols in parentheses attached to each component indicate an example of the correspondence between the component and the specific components described in the embodiments described below. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view of an imaging device according to a first embodiment. [Figure 2] An enlarged cross-sectional view of line II-II in Figure 1. [Figure 3] An enlarged cross-sectional view of line III-III in Figure 1. [Figure 4] An enlarged cross-sectional view of line IV-IV in Figure 1. [Figure 5] Enlarged cross-sectional view of line VV in Figure 1. [Figure 6] Enlarged cross-sectional view of line VI-VI in Figure 1. [Figure 7] Enlarged cross-sectional view of line VII-VII in Figure 1. [Figure 8] 8 is a reduced cross-sectional view taken along line VIII-VIII in Figures 2, 3, 4, 5, 6, and 7. [Figure 9] 4A and 4B are diagrams showing forces acting on a first holder and a second holder of the imaging device. [Figure 10] FIG. 2 is a diagram showing a part of the imaging device as seen from the X direction in FIG. [Figure 11] FIG. 10 is a cross-sectional view of an imaging device of a comparative example. [Figure 12] FIG. 10 is a cross-sectional view showing the image pickup device of the comparative example when the temperature is high. [Figure 13] FIG. 10 is a cross-sectional view showing the image pickup device of the comparative example when the temperature is low. [Figure 14] FIG. 10 is a diagram showing a first fixing member and a second fixing member of an imaging device of a comparative example. [Figure 15] FIG. 10 is a diagram showing a part of an imaging apparatus according to a second embodiment. [Figure 16] FIG. 10 is a diagram showing a part of an imaging device according to a third embodiment. [Figure 17] FIG. 10 is a cross-sectional view of an imaging device according to a fourth embodiment. [Figure 18] FIG. [Figure 19] FIG. 10 is a cross-sectional view of an imaging device according to a fifth embodiment. [Figure 20] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments will be described with reference to the drawings. In the following embodiments, identical or equivalent parts will be denoted by the same reference numerals, and description thereof will be omitted.

[0011] (First embodiment) The imaging device of this embodiment suppresses misalignment of the optical axis of the lens caused by temperature changes. The imaging device is, for example, a stereo camera and is used in a vehicle (not shown). The imaging device is, for example, disposed near the windshield inside the vehicle cabin and captures an image of the area in front of the vehicle. The imaging device is not limited to capturing an image of the area in front of the vehicle, but may also capture an image of the surroundings of the vehicle, such as the left, right, and rear of the vehicle.

[0012] 1 to 10, imaging device 10 includes a first lens 11, a first holder 21, a first substrate 31, a first imaging element 41, and a first substrate fixing member 51. Imaging device 10 also includes a second lens 12, a second holder 22, a second substrate 32, a second imaging element 42, and a second substrate fixing member 52. Imaging device 10 also includes a housing 60, a first fixing member 71, a second fixing member 72, a third fixing member 73, and a fourth fixing member 74.

[0013] 1 and 3, the first lens 11 collects light from the front side of the vehicle to capture an image of the area ahead of the vehicle. Note that here, a first optical axis O1, which is the optical axis of the first lens 11, extends in the longitudinal direction of the vehicle.

[0014] The first holder 21 is made of metal such as aluminum or copper, or resin, etc. The first holder 21 has a first housing portion 210 and a first base portion 212, as shown in FIGS.

[0015] The first housing portion 210 is formed in a cylindrical shape extending in the direction of the first optical axis O1. Furthermore, the first housing portion 210 houses the first lens 11. The first base portion 212 is connected to the first housing portion 210. Furthermore, the first base portion 212 extends from the first housing portion 210 in a direction perpendicular to the first optical axis O1.

[0016] The first substrate 31 is a printed circuit board. The first imaging element 41 is a semiconductor image sensor element such as a CMOS image sensor. Furthermore, as shown in FIG. 3, the first imaging element 41 is mounted on a surface of the first substrate 31 that faces the first lens 11 in the direction of the first optical axis O1. Therefore, the first imaging element 41 outputs a signal corresponding to an image captured based on light that has passed through the first lens 11. Furthermore, the first substrate 31 acquires the signal from the first imaging element 41. Furthermore, the first substrate 31 outputs the signal from the first imaging element 41 to, for example, an image recognition device (not shown).

[0017] The first substrate fixing member 51 is, for example, an adhesive, and is adhered to the surface of the first substrate 31 on which the first imaging element 41 is mounted and to the first end 214 of the first base portion 212. In this way, the first substrate fixing member 51 fixes the first holder 21 and the first substrate 31. The first end 214 is the end of the first base portion 212 on the opposite side from the first accommodation portion 210.

[0018] 1 and 6, the second lens 12 collects light from the front of the vehicle to capture an image of the area ahead of the vehicle. Note that here, a second optical axis O2, which is the optical axis of the second lens 12, extends in the longitudinal direction of the vehicle. The second optical axis O2 is parallel to the first optical axis O1.

[0019] The second holder 22 is made of metal such as aluminum or copper, or resin, etc. Furthermore, the second holder 22 has a second housing portion 220 and a second base portion 222, as shown in FIGS.

[0020] The second housing portion 220 is formed in a cylindrical shape extending in the direction of the second optical axis O2. Furthermore, the second housing portion 220 houses the second lens 12. The second base portion 222 is connected to the second housing portion 220. Furthermore, the second base portion 222 extends from the second housing portion 220 in a direction perpendicular to the second optical axis O2.

[0021] The second substrate 32 is a printed circuit board. The second imaging element 42 is a semiconductor image sensor element such as a CMOS image sensor. Furthermore, as shown in FIG. 6, the second imaging element 42 is mounted on a surface of the second substrate 32 that faces the second lens 12 in the direction of the second optical axis O2. Therefore, the second imaging element 42 outputs a signal corresponding to an image captured based on light that has passed through the second lens 12. Furthermore, the second substrate 32 acquires the signal from the second imaging element 42. Furthermore, the second substrate 32 outputs the signal from the second imaging element 42 to, for example, an image recognition device (not shown).

[0022] Therefore, the image recognition device calculates the distance from the vehicle to an object ahead of the vehicle by using signals from the first board 31 and the second board 32 and triangulation or the like. The image recognition device also outputs the calculated distance to a driving assistance device (not shown). The driving assistance device performs driving assistance for the vehicle, such as ACC, based on the distance calculated by the image recognition device. ACC is an abbreviation for Adaptive Cruise Control.

[0023] The second substrate fixing member 52 is, for example, an adhesive, and is bonded to the surface of the second substrate 32 on which the second imaging element 42 is mounted and to the second end 224 of the second base portion 222. In this way, the second substrate fixing member 52 fixes the second holder 22 and the second substrate 32. The second end 224 is the end of the second base portion 222 on the opposite side from the second accommodating portion 220.

[0024] The housing 60 is formed in a box shape from a metal such as aluminum or copper, or from a resin, etc. Furthermore, the housing 60 is preferably formed from the same material as the first holder 21 and the second holder 22. Here, "same" includes a manufacturing tolerance range.

[0025] 2 to 7, the housing 60 has a housing accommodating portion 600 and a housing cover portion 602. The housing accommodating portion 600 accommodates the first base portion 212, the first imaging element 41, the second base portion 222, and the second imaging element 42. The housing accommodating portion 600 is open toward the rear of the vehicle. The housing cover portion 602 closes the opening of the housing accommodating portion 600.

[0026] The first fixing member 71 and the second fixing member 72 are, for example, screws or pins, and bring the first base portion 212 and the housing 60 into contact in the direction of the first optical axis O1, as shown in FIGS. 2 to 4. Furthermore, portions of the first fixing member 71 and the second fixing member 72 are inserted into holes formed in the first base portion 212 and the housing 60. In this way, the first fixing member 71 and the second fixing member 72 fix the first base portion 212 and the housing 60 together.

[0027] The first fixing member 71 also has a first head portion 710. The first head portion 710 is a portion of the first fixing member 71 that is located on the opposite side of the first base portion 212, in this case, on the front side of the vehicle. Furthermore, the first head portion 710 and the first base portion 212 sandwich the housing 60 therebetween.

[0028] The second fixing member 72 also has a second head portion 720. The second head portion 720 is a portion of the second fixing member 72 that is located on the opposite side of the second fixing member 72 from the first base portion 212, in this case, on the front side of the vehicle. Furthermore, the second head portion 720 and the first base portion 212 sandwich the housing 60 therebetween.

[0029] The third fixing member 73 and the fourth fixing member 74 are, for example, screws or pins, and bring the second base portion 222 and the housing 60 into contact in the direction of the second optical axis O2, as shown in FIGS. 5 to 7. Furthermore, portions of the third fixing member 73 and the fourth fixing member 74 are inserted into holes formed in the second base portion 222 and the housing 60. In this way, the third fixing member 73 and the fourth fixing member 74 fix the second base portion 222 and the housing 60 together.

[0030] The third fixing member 73 also has a third head portion 730. The third head portion 730 is a portion of the third fixing member 73 that is located on the opposite side of the second base portion 222, in this case, on the front side of the vehicle. Furthermore, the third head portion 730 and the second base portion 222 sandwich the housing 60 therebetween.

[0031] The fourth fixing member 74 also has a fourth head portion 740. The fourth head portion 740 is a portion of the fourth fixing member 74 that is located on the opposite side of the second base portion 222, in this case, on the front side of the vehicle. Furthermore, the fourth head portion 740 and the second base portion 222 sandwich the housing 60 therebetween.

[0032] Here, the linear expansion coefficient of the housing 60 is αh. The linear expansion coefficient of the first fixing member 71 is α1. The linear expansion coefficient of the second fixing member 72 is α2. The linear expansion coefficient of the third fixing member 73 is α3. The linear expansion coefficient of the fourth fixing member 74 is α4.

[0033] The linear expansion coefficient of the housing 60 is different from the linear expansion coefficients of the first fixing member 71, the second fixing member 72, the third fixing member 73, and the fourth fixing member 74. That is, αh ≠ α1, αh ≠ α2, αh ≠ α3, and αh ≠ α4. Note that α1, α2, α3, and α4 may be different from one another or may be the same. Furthermore, αh, α1, α2, α3, and α4 are measured by measuring the linear expansion coefficients of the materials of the housing 60, the first fixing member 71, the second fixing member 72, the third fixing member 73, and the fourth fixing member 74. The linear expansion coefficients of the materials are measured, for example, in accordance with JIS Z 2285, JIS K 7197, or the like.

[0034] 2 to 4, the length on the first optical axis O1 from the portion of the first base portion 212 that is in contact with the housing 60 to the first end portion 214 is defined as a first base length Lb1. The length on the first optical axis O1 from the portion of the housing 60 that is in contact with the first head portion 710 or the second head portion 720 to the portion of the housing 60 that is in contact with the first base portion 212 is defined as a first housing length Lh1. The first end portion 214 corresponds to the end portion of the first base portion 212 that is opposite to the portion that is in contact with the housing 60.

[0035] 5 to 7, the length on the second optical axis O2 from the portion of the second base portion 222 that is in contact with the housing 60 to the second end portion 224 is defined as a second base length Lb2. The length on the second optical axis O2 from the portion of the housing 60 that is in contact with the third head portion 730 or the fourth head portion 740 to the portion of the housing 60 that is in contact with the second base portion 222 is defined as a second housing length Lh2. The second end portion 224 corresponds to the end portion of the second base portion 222 that is opposite to the portion that is in contact with the housing 60.

[0036] 2 to 4, the first base length Lb1 is longer than the first housing length Lh1, i.e., Lb1>Lh1. Furthermore, as shown in FIGS. 5 to 7, the second base length Lb2 is longer than the second housing length Lh2, i.e., Lb2>Lh2.

[0037] 8, the inner wall of the housing 60 is in contact with the first base portion 212 in a direction perpendicular to the first optical axis O1. A portion of the housing 60 in contact with the first base portion 212 in a direction perpendicular to the first optical axis O1 is referred to as a first contact portion 611. Furthermore, the inner wall of the housing 60 is in contact with the second base portion 222 in a direction perpendicular to the second optical axis O2. A portion of the housing 60 in contact with the second base portion 222 in a direction perpendicular to the second optical axis O2 is referred to as a second contact portion 622.

[0038] 9, the direction of the force acting from the first contact portion 611 to the first base portion 212 and the direction of the force acting from the second contact portion 622 to the second base portion 222 are the same. In FIG. 9, the force acting from the first contact portion 611 to the first base portion 212 and the force acting from the second contact portion 622 to the second base portion 222 are schematically indicated by arrows. Also, here, the number of first contact portions 611 and second contact portions 622 is two, but is not limited to two. The number of first contact portions 611 and second contact portions 622 may be one, or three or more.

[0039] 1 and 10, the direction in which the first lens 11 and the second lens 12 are aligned is referred to as the parallel direction Dp. Here, the parallel direction Dp coincides with the left-right direction of the vehicle. Also, as shown in FIG. 10, a straight line passing through the first optical axis O1 and extending in the parallel direction Dp is referred to as the first straight line I1. A straight line passing through the second optical axis O2 and extending in the parallel direction Dp is referred to as the second straight line I2.

[0040] The first fixing member 71 is disposed on one side of the first straight line I1 in a direction perpendicular to the direction of the first optical axis O1 and the parallel direction Dp, in this case, on the vehicle upper side. The second fixing member 72 is disposed on the other side of the first straight line I1 in a direction perpendicular to the direction of the first optical axis O1 and the parallel direction Dp, in this case, on the vehicle lower side.

[0041] The third fixing member 73 is disposed on one side of the second straight line I2 in a direction perpendicular to the second optical axis O2 and the parallel direction Dp, in this case, on the vehicle upper side. The fourth fixing member 74 is disposed on the other side of the second straight line I2 in a direction perpendicular to the second optical axis O2 and the parallel direction Dp, in this case, on the vehicle lower side.

[0042] The imaging device 10 of the first embodiment is configured as described above. Next, it will be described how the imaging device 10 of the present embodiment suppresses deviation of the first optical axis O1 and the second optical axis O2 caused by temperature changes.

[0043] Here, as a comparative example, when the first base portion 212 and the housing 60 are fixed by the first fixing member 71 as shown in FIG. 11, the first base length Lb1 is less than or equal to the first housing length Lh1, i.e., Lb1≦Lh1.

[0044] In this case, the linear expansion coefficient of the housing 60 is greater than the linear expansion coefficient of the first fixing member 71, that is, αh>α1.

[0045] At this time, when the temperatures of the housing 60 and the first fixing member 71 increase, the amount of expansion of the housing 60 in the direction of the first optical axis O1 becomes greater than the amount of expansion of the first fixing member 71 in the direction of the first optical axis O1 because αh>α1, as shown in FIG. 12 . As a result, the strain of the housing 60 in the direction of the first optical axis O1 becomes relatively large. Furthermore, the housing 60 is constrained by the first base portion 212 and the first fixing member 71. Therefore, thermal stress is generated in the housing 60. The generated thermal stress is applied to the housing 60, the first fixing member 71, and the first base portion 212. As a result, the posture of the first base portion 212 may change. When the posture of the first base portion 212 changes, the posture of the first holder 21 changes. When the posture of the first holder 21 changes, the posture of the first lens 11 changes. When the posture of the first lens 11 changes, the first optical axis O1 shifts. In FIG. 12, the amount of expansion of the housing 60 and the first fixing member 71 is schematically indicated by two-dot chain lines.

[0046] Furthermore, at this time, when the temperatures of the housing 60 and the first fixing member 71 decrease, αh>α1, and therefore, as shown in FIG. 13 , the amount of contraction of the housing 60 becomes greater than the amount of contraction of the first fixing member 71. As a result, the repulsive force on the housing 60 generated by the force pulling the first fixing member 71 in the direction of the first optical axis O1 decreases, and the fixing force between the housing 60 and the first fixing member 71 decreases. Therefore, the fixing force between the housing 60 and the first base portion 212 decreases. When the fixing force between the housing 60 and the first base portion 212 decreases, the orientation of the first base portion 212 may change. When the orientation of the first base portion 212 changes, the first optical axis O1 shifts, as described above.

[0047] Furthermore, when Lb1≦Lh1, the linear expansion coefficient of the housing 60 is smaller than the linear expansion coefficient of the first fixing member 71, that is, αh<α1.

[0048] At this time, when the temperatures of the housing 60 and the first fixing member 71 increase, the amount of extension of the first fixing member 71 in the direction of the first optical axis O1 becomes greater than the amount of extension of the housing 60 in the direction of the first optical axis O1 because αh<α1. As a result, the repulsive force on the housing 60 generated by the force pulling the first fixing member 71 in the direction of the first optical axis O1 decreases, and the fixing force between the housing 60 and the first fixing member 71 decreases. As a result, the fixing force between the housing 60 and the first base portion 212 decreases. When the fixing force between the housing 60 and the first base portion 212 decreases, the orientation of the first base portion 212 may change. When the orientation of the first base portion 212 changes, the first optical axis O1 shifts, as described above.

[0049] Furthermore, at this time, when the temperatures of the housing 60 and the first fixing member 71 drop, the amount of contraction of the first fixing member 71 becomes greater than the amount of contraction of the housing 60 because αh<α1. As a result, the strain of the first fixing member 71 in the direction of the first optical axis O1 becomes relatively large. Furthermore, the first fixing member 71 is constrained by the housing 60. Therefore, thermal stress is generated in the first fixing member 71. The generated thermal stress is applied to the first fixing member 71, the housing 60, and the first base portion 212. For this reason, the posture of the first base portion 212 may change. If the posture of the first base portion 212 changes, the first optical axis O1 will be misaligned, as described above.

[0050] In contrast to these, in the imaging device 10 of this embodiment, αh≠α1, αh≠α2, and as shown in Figures 2 to 4, the first base length Lb1 is longer than the first housing length Lh1, i.e., Lb1>Lh1.

[0051] As a result, the length of the portion of the housing 60 fixed by the first fixing member 71 and the second fixing member 72 becomes relatively short. This suppresses an increase in the amount of expansion and contraction of the housing 60 due to temperature changes of the housing 60. This suppresses an increase in distortion of the housing 60 due to temperature changes of the housing 60. This suppresses an increase in thermal stress occurring in the housing 60. This suppresses a change in the posture of the first base portion 212 due to thermal stress. This suppresses misalignment of the first optical axis O1.

[0052] Furthermore, because an increase in the amount of expansion and contraction of the housing 60 due to temperature changes in the housing 60 is suppressed, a decrease in the repulsive force on the housing 60, which is generated by the force pulling the first fixing member 71 in the direction of the first optical axis O1, is suppressed. Therefore, a decrease in the fixing force between the housing 60 and the first fixing member 71 is suppressed. This suppresses a decrease in the fixing force between the housing 60 and the first base portion 212. Therefore, misalignment of the first optical axis O1 is suppressed. Therefore, a misalignment of the first optical axis O1 caused by temperature changes is suppressed.

[0053] Furthermore, while αh≠α3 and αh≠α4, as shown in FIGS. 5 to 7, the second base length Lb2 is longer than the second housing length Lh2, that is, Lb2>Lh2.

[0054] This makes it possible to relatively shorten the length of the portion of the housing 60 that is fixed by the third fixing member 73 and the fourth fixing member 74. Therefore, similarly to the above, deviation of the second optical axis O2 caused by temperature changes is suppressed.

[0055] Furthermore, the imaging device 10 of the first embodiment also provides the following effects.

[0056] [1-1] Here, when thermal stress is generated in the first base portion 212, the second base portion 222, and the housing 60, creep occurs in the first base portion 212, the second base portion 222, and the housing 60 over time. At this time, if the direction of the force acting from the first contact portion 611 to the first base portion 212 differs from the direction of the force acting from the second contact portion 622 to the second base portion 222, the direction of positional misalignment of the first base portion 212 differs from the direction of positional misalignment of the second base portion 222. If the direction of positional misalignment of the first base portion 212 differs from the direction of positional misalignment of the second base portion 222, the direction of positional misalignment of the first holder 21 differs from the direction of positional misalignment of the second holder 22. If the direction of positional misalignment of the first holder 21 differs from the direction of positional misalignment of the second holder 22, the positional relationship between the first optical axis O1 and the second optical axis O2 is misaligned. Therefore, if the direction of the force acting from the first contact portion 611 to the first base portion 212 differs from the direction of the force acting from the second contact portion 622 to the second base portion 222, the positional relationship between the first optical axis O1 and the second optical axis O2 changes over time. If the positional relationship between the first optical axis O1 and the second optical axis O2 changes, the accuracy of calculating the distance from the vehicle to an object in front of the vehicle using triangulation or the like by an image recognition device decreases.

[0057] In contrast, in the imaging device 10 of the first embodiment, as shown in Figures 8 and 9, the direction of the force acting from the first contact portion 611 to the first base portion 212 and the direction of the force acting from the second contact portion 622 to the second base portion 222 are the same.

[0058] This suppresses changes in the positional relationship between the first optical axis O1 and the second optical axis O2 due to creep, thereby suppressing a decrease in the accuracy of calculations of the distance from the vehicle to an object ahead of the vehicle using triangulation or the like with an image recognition device.

[0059] [1-2] Here, a temperature rise between the first base portion 212 and the housing 60 causes differential expansion between the first base portion 212 and the housing 60. This may result in thermal stress being generated in the first base portion 212 and the housing 60. The thermal stress generated in the first base portion 212 and the housing 60 may change the posture of the first holder 21. If the posture of the first holder 21 changes, the first optical axis O1 may be misaligned. Furthermore, a temperature rise between the second base portion 222 and the housing 60 causes differential expansion between the second base portion 222 and the housing 60. This may result in thermal stress being generated in the second base portion 222 and the housing 60. The thermal stress generated in the second base portion 222 and the housing 60 may change the posture of the second holder 22. If the posture of the second holder 22 changes, the second optical axis O2 may be misaligned. For these reasons, it is preferable that the first holder 21, the second holder 22, and the housing 60 be made of the same material.

[0060] This makes it easier for the linear expansion coefficient of the first base portion 212 and the linear expansion coefficient of the housing 60 to be the same. This reduces the difference in expansion between the first base portion 212 and the housing 60 due to a rise in temperature of the first base portion 212 and the housing 60. This reduces the increase in thermal stress generated in the first base portion 212 and the housing 60. This reduces the deviation of the first optical axis O1 caused by temperature changes.

[0061] Furthermore, the linear expansion coefficient of the second base portion 222 and the linear expansion coefficient of the housing 60 tend to be the same. This reduces the difference in expansion between the second base portion 222 and the housing 60 due to a rise in temperature of the second base portion 222 and the housing 60. This reduces the increase in thermal stress generated in the second base portion 222 and the housing 60. This reduces the deviation of the second optical axis O2 caused by temperature changes.

[0062] [1-3] Here, the first base portion 212 may rotate around an axis that is a line connecting the first fixing member 71 and the second fixing member 72. Also, as shown in Fig. 14, it is assumed that the first fixing member 71 and the second fixing member 72 are aligned on a first straight line I1. In this case, the amount of rotation of the first base portion 212 around the axis that is a straight line extending in the parallel direction Dp is relatively large.

[0063] 10, in the imaging device 10 of the first embodiment, the first fixing member 71 is disposed on one side of the first straight line I1 in a direction perpendicular to the direction of the first optical axis O1 and the parallel direction Dp, and the second fixing member 72 is disposed on the other side of the first straight line I1 in a direction perpendicular to the direction of the first optical axis O1 and the parallel direction Dp.

[0064] As a result, the line connecting the first fixing member 71 and the second fixing member 72 intersects with the first straight line I1, so rotation of the first base portion 212 about an axis that is a straight line extending in the parallel direction Dp is suppressed compared to the above case. This suppresses rotation of the first holder 21 about an axis that is a straight line extending in the parallel direction Dp. Therefore, rotation of the first lens 11 about an axis that is a straight line extending in the parallel direction Dp is suppressed. This suppresses deviation of the first optical axis O1 in the rotation direction about an axis that is a straight line extending in the parallel direction Dp.

[0065] The third fixing member 73 is disposed on one side of the second straight line I2 in a direction perpendicular to the second optical axis O2 and the parallel direction Dp, and the fourth fixing member 74 is disposed on the other side of the second straight line I2 in a direction perpendicular to the second optical axis O2 and the parallel direction Dp.

[0066] As a result, the line connecting the third fixing member 73 and the fourth fixing member 74 intersects with the first straight line I1, thereby suppressing rotation of the second base portion 222 about an axis that is a line extending in the parallel direction Dp. This suppresses rotation of the second holder 22 about an axis that is a line extending in the parallel direction Dp. This therefore suppresses rotation of the second lens 12 about an axis that is a line extending in the parallel direction Dp. This suppresses deviation of the second optical axis O2 in the rotational direction about an axis that is a line extending in the parallel direction Dp.

[0067] (Second embodiment) 15, the imaging device 10 in the second embodiment further includes a fifth fixing member 75 and a sixth fixing member 76. Other than this, the imaging device 10 is similar to the first embodiment.

[0068] The fifth fixing member 75 is, for example, a screw or a pin, and brings the first base portion 212 and the housing 60 into contact in the direction of the first optical axis O1. Furthermore, a portion of the fifth fixing member 75 is inserted into holes formed in the first base portion 212 and the housing 60. In this way, the fifth fixing member 75, together with the first fixing member 71 and the second fixing member 72, fixes the first base portion 212 and the housing 60 together.

[0069] Furthermore, a triangular plane is formed by the line segments connecting the first fixing member 71, the second fixing member 72, and the fifth fixing member 75. Therefore, the fifth fixing member 75 is not located on the line connecting the first fixing member 71 and the second fixing member 72.

[0070] The sixth fixing member 76 is, for example, a screw or a pin, and brings the second base portion 222 and the housing 60 into contact in the direction of the second optical axis O2. Furthermore, a portion of the sixth fixing member 76 is inserted into holes formed in the second base portion 222 and the housing 60. In this way, the sixth fixing member 76, together with the third fixing member 73 and the fourth fixing member 74, fixes the second base portion 222 and the housing 60 together.

[0071] Furthermore, a triangular plane is formed by the line segments connecting the third fixing member 73, the fourth fixing member 74, and the sixth fixing member 76. Therefore, the sixth fixing member 76 is not located on the line connecting the third fixing member 73 and the fourth fixing member 74.

[0072] The imaging device 10 of the second embodiment is configured as described above. This second embodiment also provides the same effects as the first embodiment. Furthermore, the second embodiment also provides the following effects.

[0073] [2] Here, as described above, the first base portion 212 may rotate around the line connecting the first fixing member 71 and the second fixing member 72 as an axis.

[0074] In contrast, in the imaging device 10 of the second embodiment, as shown in FIG. 15, a plane is formed by the line segments connecting the first fixing member 71, the second fixing member 72, and the fifth fixing member 75 to one another.

[0075] This suppresses rotation of the first base portion 212 around the axis defined by the line connecting the first fixing member 71 and the second fixing member 72. Furthermore, this suppresses rotation of the first base portion 212 around the axis defined by the line connecting the first fixing member 71 and the fifth fixing member 75. Furthermore, this suppresses rotation of the first base portion 212 around the axis defined by the line connecting the second fixing member 72 and the fifth fixing member 75. Therefore, rotation of the first base portion 212 is suppressed. Therefore, rotation of the first holder 21 is suppressed. This suppresses rotation of the first lens 11. Therefore, misalignment of the first optical axis O1 is suppressed.

[0076] Furthermore, a plane is formed by the line segments connecting the third fixing member 73, the fourth fixing member 74, and the sixth fixing member 76 to one another.

[0077] This suppresses rotation of the second base portion 222 around the axis defined by the line connecting the third fixed member 73 and the fourth fixed member 74. Furthermore, this suppresses rotation of the second base portion 222 around the axis defined by the line connecting the third fixed member 73 and the sixth fixed member 76. Furthermore, this suppresses rotation of the second base portion 222 around the axis defined by the line connecting the fourth fixed member 74 and the sixth fixed member 76. Therefore, rotation of the second base portion 222 is suppressed. Therefore, rotation of the second holder 22 is suppressed. This suppresses rotation of the second lens 12. Therefore, misalignment of the second optical axis O2 is suppressed.

[0078] (Third embodiment) 16, the third embodiment differs from the second embodiment in the configurations of the fifth fixing member 75 and the sixth fixing member 76. Other than this, the third embodiment is similar to the second embodiment.

[0079] The fifth fixing member 75 brings the first base portion 212 and the housing 60 into contact in a direction perpendicular to the first optical axis O1 instead of in the direction of the first optical axis O1. The sixth fixing member 76 brings the second base portion 222 and the housing 60 into contact in a direction perpendicular to the second optical axis O2 instead of in the direction of the second optical axis O2.

[0080] The imaging device 10 of the third embodiment is configured as described above. The third embodiment also provides the same effects as the second embodiment.

[0081] (Fourth embodiment) 17 and 18, the fourth embodiment differs from the first embodiment in the shapes of the first substrate fixing member 51 and the second substrate fixing member 52. Other than this, the fourth embodiment is similar to the first embodiment.

[0082] 17, the first substrate fixing member 51 is not an adhesive but is a screw, a pin, or the like. Furthermore, a portion of the first substrate fixing member 51 is inserted into holes formed in the first end portion 214 and the first substrate 31. In this way, the first substrate fixing member 51 fixes the first holder 21 and the first substrate 31 together.

[0083] 18, the second substrate fixing member 52 is a screw, a pin, or the like instead of an adhesive. Furthermore, a portion of the second substrate fixing member 52 is inserted into holes formed in the second end portion 224 and the second substrate 32. In this way, the second substrate fixing member 52 fixes the second holder 22 and the second substrate 32 together.

[0084] The imaging device 10 of the fourth embodiment is configured as described above. This fourth embodiment also provides the same effects as the first embodiment.

[0085] (Fifth embodiment) 19 and 20, the imaging device 10 in the fifth embodiment further includes a first reinforcing portion 81, a first reinforcing fixing member 91, a second reinforcing portion 82, and a second reinforcing fixing member 92. The shapes of the first substrate fixing member 51 and the second substrate fixing member 52 are different from those in the first embodiment. Other than this, the imaging device 10 is similar to the first embodiment.

[0086] 19 , the first reinforcing portion 81 is formed of metal or the like in the shape of a plate extending in a direction perpendicular to the first optical axis O1. The first reinforcing fixing member 91 is, for example, a screw or a pin, and brings the first reinforcing portion 81 and the first end portion 214 into contact in the direction of the first optical axis O1. Furthermore, a portion of the first reinforcing fixing member 91 is inserted into holes formed in the first reinforcing portion 81 and the first end portion 214. In this way, the first reinforcing fixing member 91 fixes the first base portion 212 and the first reinforcing portion 81 together.

[0087] The first substrate fixing member 51 is, for example, a screw or a pin, and brings the first substrate 31 and the first reinforcing portion 81 into contact in the direction of the first optical axis O1. Furthermore, a portion of the first substrate fixing member 51 is inserted into a hole formed in the first substrate 31 and the first reinforcing portion 81. In this way, the first substrate fixing member 51 fixes the first reinforcing portion 81 and the first substrate 31. Therefore, the fixation between the first holder 21 and the first substrate 31 is reinforced by the first reinforcing portion 81 and the first reinforcing fixing member 91.

[0088] 20 , the second reinforcing portion 82 is formed of metal or the like in the shape of a plate extending in a direction perpendicular to the second optical axis O2. The second reinforcing fixing member 92 is, for example, a screw or a pin, and brings the second reinforcing portion 82 and the second end portion 224 into contact in the direction of the second optical axis O2. Furthermore, a portion of the second reinforcing fixing member 92 is inserted into holes formed in the second reinforcing portion 82 and the second end portion 224. In this way, the second reinforcing fixing member 92 fixes the second base portion 222 and the second reinforcing portion 82 together.

[0089] The second substrate fixing member 52 is, for example, a screw or a pin, and brings the second substrate 32 and the second reinforcing portion 82 into contact in the direction of the second optical axis O2. A portion of the second substrate fixing member 52 is inserted into a hole formed in the second substrate 32 and the second reinforcing portion 82. In this way, the second substrate fixing member 52 fixes the second reinforcing portion 82 and the second substrate 32. Therefore, the fixation between the second holder 22 and the second substrate 32 is reinforced by the second reinforcing portion 82 and the second reinforcing fixing member 92.

[0090] The imaging device 10 of the fifth embodiment is configured as described above. The fifth embodiment also provides the same effects as the first embodiment.

[0091] (Other embodiments) The present disclosure is not limited to the above-described embodiments, and appropriate modifications can be made to the above-described embodiments. Furthermore, it goes without saying that the elements constituting the embodiments in the above-described embodiments are not necessarily essential unless they are specifically stated as essential or are considered to be clearly essential in principle.

[0092] In each of the above embodiments, the imaging device 10 is a stereo camera having two cameras. However, the number of cameras in the imaging device 10 is not limited to two. The number of cameras in the imaging device 10 may be one, or three or more.

[0093] In each of the above embodiments, the imaging device 10 is used in a vehicle. However, the imaging device 10 is not limited to being used in a vehicle, and may be used in, for example, equipment or the like.

[0094] The above embodiments may be combined as appropriate.

[0095] (Aspects of the present disclosure) [Point 1] An imaging device, Lens (11) and a holder (21) having a housing portion (210) that houses the lens and a base portion (212) that is connected to the housing portion and extends in a direction perpendicular to the optical axis (O1) of the lens; an imaging element (41) that outputs a signal corresponding to an image captured based on light passing through the lens; a housing (60) that houses the base portion and the imaging element; a fixing member (71) that brings the base portion and the housing into contact with each other in the direction of the optical axis and fixes the base portion and the housing together; Equipped with The fixing member has a head portion (710) that sandwiches the housing with the base portion, the housing and the fixing member have different linear expansion coefficients, An imaging device in which the length (Lb1) in the direction of the optical axis from the part of the base that is in contact with the housing to the end (214) opposite the part that is in contact with the housing is longer than the length (Lh1) in the direction of the optical axis from the part of the housing that is in contact with the head to the part that is in contact with the base. [Point 2] The imaging device according to aspect 1, wherein the holder and the housing are formed from the same material. [Point 3] The lens is a first lens, The housing is a first housing, The base portion is a first base portion, The holder is a first holder, the imaging element is a first imaging element, The fixing member is a first fixing member, The head is a first head, The imaging device is A second lens (12), a second imaging element (42) that outputs a signal corresponding to an image captured based on light that has passed through the second lens; a second holder (22) having a second housing portion (220) that houses the second lens and a second base portion (222) that is connected to the second housing portion and extends in a direction perpendicular to the optical axis; a second fixing member (73) that brings the second base portion and the housing into contact with each other in the direction of the optical axis and fixes the second base portion and the housing; Equipped with the second fixing member has a second head (730) that sandwiches the housing with the second base portion, the housing accommodates the first base portion, the first imaging element, the second base portion, and the second imaging element; the housing and the second fixing member have different linear expansion coefficients, The imaging device described in aspect 1, wherein the length (Lb2) in the direction of the optical axis from the portion of the second base portion that is in contact with the housing to the end (224) opposite the portion that is in contact with the housing is longer than the length (Lh2) in the direction of the optical axis from the portion of the housing that is in contact with the second head portion to the portion that is in contact with the second base portion. [Point 4] The housing includes: a first contact portion (611) in contact with the first base portion in a direction perpendicular to the optical axis; a second contact portion (622) in contact with the second base portion in a direction perpendicular to the optical axis; and An imaging device according to aspect 3, wherein the direction of the force acting from the first contact portion to the first base portion is the same as the direction of the force acting from the second contact portion to the second base portion. [Point 5] The imaging device according to aspect 3 or 4, wherein the first holder, the second holder and the housing are made of the same material. [Point 6] the first lens and the second lens are aligned in a direction perpendicular to the optical axis, The imaging device is a third fixing member (72) that brings the first base portion and the housing into contact with each other in the direction of the optical axis and fixes the first base portion and the housing; a fourth fixing member (74) that brings the second base portion and the housing into contact with each other in the direction of the optical axis and fixes the second base portion and the housing; Equipped with a direction in which the first lens and the second lens are arranged is defined as a parallel direction (Dp); The optical axis is a first optical axis, A straight line passing through the first optical axis and extending in the parallel direction is defined as a first straight line (I1), The optical axis of the second lens is defined as a second optical axis (O2), If a line passing through the second optical axis and extending in the parallel direction is defined as a second line (I2), the first fixing member is disposed on one side of the first straight line in a direction perpendicular to the first optical axis direction and the parallel direction, the second fixing member is disposed on one side of the second straight line in a direction perpendicular to the second optical axis direction and the parallel direction, the third fixing member is disposed on the other side of the first straight line in a direction perpendicular to the first optical axis direction and the parallel direction, An imaging device described in any one of aspects 3 to 5, wherein the fourth fixing member is arranged on the other side of the second straight line in a direction perpendicular to the direction of the second optical axis and the parallel direction. [Point 7] The imaging device is a fifth fixing member (75) that fixes the first base portion and the housing; a sixth fixing member (76) that fixes the second base portion and the housing; Equipped with a plane is formed by line segments connecting the first fixing member, the third fixing member, and the fifth fixing member, The imaging device according to Aspect 6, wherein a plane is formed by line segments connecting the second fixing member, the fourth fixing member, and the sixth fixing member. [Point 8] The fixing member is a first fixing member, The imaging device is a second fixing member (72) that brings the base portion and the housing into contact with each other in the direction of the optical axis and fixes the base portion and the housing together; a third fixing member (75) that fixes the base portion and the housing; Equipped with The imaging device according to Aspect 1 or 2, wherein a plane is formed by line segments connecting the first fixing member, the second fixing member, and the third fixing member. [Explanation of symbols]

[0096] 10. Imaging device 11 First lens 21 First Holder 210 First storage unit 212 First base section 214 First end 41 First image sensor 60 Housing 71 First fixing member 710 Head 1

Claims

1. An imaging device, A lens (11), a holder (21) having a housing portion (210) that houses the lens and a base portion (212) that is connected to the housing portion and extends in a direction perpendicular to the optical axis (O1) of the lens; an imaging element (41) that outputs a signal corresponding to an image captured based on light passing through the lens; a housing (60) that houses the base portion and the imaging element; a fixing member (71) that brings the base portion and the housing into contact with each other in the direction of the optical axis and fixes the base portion and the housing together; Equipped with The fixing member has a head (710) that sandwiches the housing with the base portion, the housing and the fixing member have different linear expansion coefficients, An imaging device in which the length (Lb1) in the direction of the optical axis from the part of the base that is in contact with the housing to the end (214) opposite the part that is in contact with the housing is longer than the length (Lh1) in the direction of the optical axis from the part of the housing that is in contact with the head to the part that is in contact with the base.

2. The imaging device according to claim 1 , wherein the holder and the housing are made of the same material.

3. The lens is a first lens, The storage section is a first storage section, The base portion is a first base portion, The holder is a first holder, the imaging element is a first imaging element, The fixing member is a first fixing member, The head is a first head, The imaging device is A second lens (12); a second imaging element (42) that outputs a signal corresponding to an image captured based on light that has passed through the second lens; a second holder (22) having a second housing portion (220) that houses the second lens and a second base portion (222) that is connected to the second housing portion and extends in a direction perpendicular to the optical axis; a second fixing member (73) that brings the second base portion and the housing into contact with each other in the direction of the optical axis and fixes the second base portion and the housing; Equipped with the second fixing member has a second head (730) that sandwiches the housing with the second base portion, the housing accommodates the first base portion, the first imaging element, the second base portion, and the second imaging element; the housing and the second fixing member have different linear expansion coefficients, 2. The imaging device of claim 1, wherein the length (Lb2) in the direction of the optical axis from the portion of the second base portion that is in contact with the housing to the end (224) opposite the portion that is in contact with the housing is longer than the length (Lh2) in the direction of the optical axis from the portion of the housing that is in contact with the second head to the portion that is in contact with the second base portion.

4. The housing includes: a first contact portion (611) in contact with the first base portion in a direction perpendicular to the optical axis; a second contact portion (622) in contact with the second base portion in a direction perpendicular to the optical axis; and The imaging device according to claim 3 , wherein a direction of a force acting from the first contact portion to the first base portion and a direction of a force acting from the second contact portion to the second base portion are the same.

5. 5. The imaging device according to claim 3, wherein the first holder, the second holder, and the housing are made of the same material.

6. the first lens and the second lens are aligned in a direction perpendicular to the optical axis, The imaging device is a third fixing member (72) that brings the first base portion and the housing into contact with each other in the direction of the optical axis and fixes the first base portion and the housing; a fourth fixing member (74) that brings the second base portion and the housing into contact with each other in the direction of the optical axis and fixes the second base portion and the housing; Equipped with a direction in which the first lens and the second lens are arranged is defined as a parallel direction (Dp), The optical axis is a first optical axis, A straight line passing through the first optical axis and extending in the parallel direction is defined as a first straight line (I1), The optical axis of the second lens is defined as a second optical axis (O2), If a line passing through the second optical axis and extending in the parallel direction is defined as a second line (I2), the first fixing member is disposed on one side of the first straight line in a direction perpendicular to the first optical axis direction and the parallel direction, the second fixing member is disposed on one side of the second straight line in a direction perpendicular to the second optical axis direction and the parallel direction, the third fixing member is disposed on the other side of the first straight line in a direction perpendicular to the first optical axis direction and the parallel direction, The imaging device according to claim 3 , wherein the fourth fixing member is disposed on the other side of the second straight line in a direction perpendicular to the second optical axis direction and the parallel direction.

7. The imaging device is a fifth fixing member (75) that fixes the first base portion and the housing; a sixth fixing member (76) that fixes the second base portion and the housing; Equipped with a plane is formed by line segments connecting the first fixing member, the third fixing member, and the fifth fixing member, The imaging device according to claim 6 , wherein a plane is formed by line segments connecting the second fixing member, the fourth fixing member, and the sixth fixing member.

8. The fixing member is a first fixing member, The imaging device is a second fixing member (72) that brings the base portion and the housing into contact with each other in the direction of the optical axis and fixes the base portion and the housing; a third fixing member (75) that fixes the base portion and the housing; Equipped with The imaging device according to claim 1 , wherein a plane is formed by line segments connecting the first fixing member, the second fixing member, and the third fixing member.

Images