Optical instruments, systems, mobile devices, and methods for manufacturing optical instruments

Abstract

To provide an optical device capable of suppressing the peeling of multiple adhesives caused by temperature changes. [Solution] The optical instrument (100) has a first holding part (6) that holds a first element (7-11) and a second holding part (25) that holds a second element (18). The first holding part has a first adhesive surface (6d), and the second holding part has a second adhesive surface (25b) and a third adhesive surface (25c) that face the first adhesive surface. The first adhesive surface and the second adhesive surface are bonded to each other by a first adhesive (26), and the first adhesive surface and the third adhesive surface are bonded to each other by a second adhesive (27). The first coefficient of thermal expansion of the first adhesive and the second coefficient of thermal expansion of the second adhesive are different from each other, and the first thickness of the first adhesive and the second thickness of the second adhesive in the first direction are different from each other.

Description

Technical Field

[0001] The present invention relates to an optical device, a system, a mobile device, and a method for manufacturing an optical device.

Background Art

[0002] Patent Document 1 discloses a method for manufacturing a lens unit that fixes an imaging lens and an imaging element by curing an ultraviolet curable adhesive and a thermosetting adhesive after adjusting the position of the imaging surface of the imaging element with respect to the imaging lens.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In an optical device, it is desirable to suppress peeling of a plurality of adhesives due to temperature changes.

Means for Solving the Problems

[0005] An imaging device according to one aspect of the present invention includes a first holding portion that holds a first element and a second holding portion that holds a second element. The first holding portion has a first adhesive surface, and the second holding portion has a second adhesive surface and a third adhesive surface that face the first adhesive surface. The first adhesive surface and the second adhesive surface are adhered to each other by a first adhesive, and the first adhesive surface and the third adhesive surface are adhered to each other by a second adhesive. The first linear expansion coefficient of the first adhesive and the second linear expansion coefficient of the second adhesive are different from each other, and the first thickness of the first adhesive and the second thickness of the second adhesive in a first direction are different from each other.

Effects of the Invention

[0006] According to the present invention, it is possible to provide an optical device that can suppress the peeling of multiple adhesives caused by temperature changes. [Brief explanation of the drawing]

[0007] [Figure 1] This is a block diagram of the imaging device in the first embodiment. [Figure 2] This is a schematic cross-sectional view of the imaging device in the first embodiment. [Figure 3] This is a schematic diagram of the imaging device in the second embodiment. [Figure 4] This is a flowchart showing the method for manufacturing the imaging device in each embodiment. [Figure 5] This is a functional block diagram of a system equipped with an imaging device in each embodiment. [Figure 6] This is a schematic diagram of the main parts of a mobile device equipped with an imaging device in each embodiment. [Figure 7] This flowchart shows examples of the operation of a system equipped with an imaging device in each embodiment. [Modes for carrying out the invention]

[0008] Embodiments of the present invention will be described in detail below with reference to the drawings.

[0009] <First Embodiment> First, with reference to Figure 1, the imaging device (optical instrument) 100 in the first embodiment of the present invention will be described. Figure 1 is a block diagram of the imaging device in this embodiment. The imaging device 100 includes a lens unit 1, an imaging means (imaging module) 2, a camera signal processing circuit 3, a microcontroller (control unit) 4, and a memory (storage unit) 5.

[0010] The imaging means 2 is fixed to the lens unit 1. The camera signal processing circuit 3 processes the output signal (imaging signal) from the imaging means 2. For example, the camera signal processing circuit 3 applies amplification and correction to the output signal from the imaging means 2. The image signal that has been amplified and corrected by the camera signal processing circuit 3 is output to the microcontroller 4. The microcontroller 4 performs tasks such as subject recognition based on the data stored in the memory 5.

[0011] The basic configuration shown in Figure 1 is the same for the second embodiment described later. Furthermore, while the imaging device in each embodiment is used, for example, as an in-vehicle sensing camera, it is not limited to this and can be applied to other uses such as surveillance cameras.

[0012] Next, the structure of the imaging device 100 in this embodiment will be described with reference to Figure 2. Figure 2 is a schematic cross-sectional view of the lens unit 1 and imaging means 2 that constitute the imaging device 100.

[0013] The lens barrel (first holding part) 6 holds the optical elements that constitute the imaging optical system. In this embodiment, the imaging optical system has lenses 7, 8, 9, 10, and 11 (optical elements, first element) arranged in order from the subject side to the image side. Spacers 12, 13, 14, and 15 are provided to maintain a constant distance between adjacent lenses in the direction along the optical axis (ZZ) (optical axis direction, first direction). Spacer 12 is provided between lens 7 and lens 8. Spacer 13 is provided between lens 8 and lens 9. Spacer 14 is provided between lens 9 and lens 10. Spacer 15 is provided between lens 10 and lens 11. Each of the above-mentioned lenses and spacers is diameter-fitted to the inner diameter portion 6a of the lens barrel 6 and fixed to the safety surface 6b in the optical axis direction by a retaining ring 16 that is screwed onto the threaded portion 6c.

[0014] The image sensor (second element) 18 is sealed by the case portion 19 and protective glass 20, forming the imaging unit 17. The imaging unit 17 is soldered to the printed circuit board 23, forming the imaging means 2. The sensor holder (second holding portion) 25 has a stepped portion with a guarantee surface 25a that determines the position in the optical axis direction. The optical filter 21 is a low-pass filter or an infrared cut filter, and is tightly fixed to the guarantee surface 25a by a sealing member 22. The imaging means 2 is fixed to the lens unit 1 by fastening the printed circuit board 23 to the sensor holder 25 with a screw member 24. The space formed by the protective glass 20 and the optical filter 21 is sealed by the sealing member 22 to prevent the intrusion of airborne dust and other debris.

[0015] The lens barrel 6 is provided with an adhesive surface (first adhesive surface) 6d extending in a direction perpendicular to the optical axis (ZZ). The sensor holder 25 is provided with an outer adhesive surface (second adhesive surface) 25b, an inner adhesive surface (third adhesive surface) 25c, and a groove 25d for accumulating excess adhesive, facing the adhesive surface 6d. The adhesive surfaces 25b and 25c are in a stepped relationship with respect to the optical axis direction (the adhesive surfaces 25b and 25c are located at different positions in the optical axis direction). The groove 25d provided between the adhesive surfaces 25b and 25c is not essential; it is sufficient that the adhesive surfaces 25b and 25c are stepped. In this embodiment, the sensor holder 25 may have the first adhesive surface, and the lens barrel 6 may have the second and third adhesive surfaces (the sensor holder 25 may be the first holding part, and the lens barrel 6 may be the second holding part).

[0016] A UV-curing adhesive (first adhesive) 26 is continuously applied in an uncured state between the bonding surface 6d and the bonding surface 25b. On the other hand, a thermosetting adhesive (second adhesive) 27 is continuously applied in an uncured state between the bonding surface 6d and the bonding surface 25c. The UV-curing adhesive 26 and the thermosetting adhesive 27 are arranged (applied side by side in the second direction) along a direction perpendicular to the optical axis (radial direction, second direction). Preferably, the UV-curing adhesive 26 is positioned further from the optical axis than the thermosetting adhesive 27.

[0017] In this embodiment, the ultraviolet curable adhesive 26 and the thermosetting adhesive 27 have different curing speeds. The thermosetting adhesive 27 has a slower curing speed than the ultraviolet curable adhesive 26. For example, the ultraviolet curable adhesive 26 cures in about 5 seconds, and the thermosetting adhesive 27 cures in a time of 30 minutes or more.

[0018] In order to adjust the imaging means 2 with respect to the focusing position of the lens unit 1, the sensor holder 25 is positionally adjusted while being held in the air by an adjustment device (not shown). The adjustment of the imaging means 2 is to adjust the position in the optical axis direction, the eccentricity and tilt in the direction perpendicular to the optical axis, and then irradiate the ultraviolet curable adhesive 26 with ultraviolet rays to cure it, thereby fixing the imaging element 18 at an appropriate position and sealing the space between the lens barrel 6 and the sensor holder 25.

[0019] After the ultraviolet curable adhesive 26 is cured (pre-cured), the lens unit 1 with the position of the imaging means 2 fixed is moved to a heating furnace or the like, and the thermosetting adhesive 27 is cured (main-cured) by heat of 80°C or higher. In this embodiment, it is preferable that the application area of the thermosetting adhesive 27 (the second area where the thermosetting adhesive 27 is applied to the bonding surface 25c) is wider than the application area of the ultraviolet curable adhesive 26 (the first area where the ultraviolet curable adhesive 26 is applied to the bonding surface 25b). Thereby, the main curing by the thermosetting adhesive 27 can be made more reliable.

[0020] Next, the change amount of the coating thickness of each adhesive with respect to the temperature change of the adhesive will be described. In the present embodiment, when the linear expansion coefficient (first linear expansion coefficient) of the ultraviolet curable adhesive 26 is α1 and the linear expansion coefficient (second linear expansion coefficient) of the thermosetting adhesive is α2, it is preferable to satisfy the condition of α1 > α2. Here, the coating thickness (first thickness) of the ultraviolet curable adhesive 26, that is, the distance in the optical axis direction (first direction) between the adhesive surface 6d of the lens barrel 6 and the adhesive surface 25b of the sensor holder 25 is L1. On the other hand, the coating thickness (second thickness) of the thermosetting adhesive 27, that is, the distance in the optical axis direction between the adhesive surface 6d of the lens barrel 6 and the adhesive surface 25c of the sensor holder 25 is L2. Also, a predetermined temperature is T1, and the temperature after the temperature change from T1 is T2.

[0021] The change amount of the coating thickness of each adhesive with respect to the optical axis direction during the temperature change is obtained as follows by using the linear expansion coefficient and the coating thickness of each adhesive. That is, for the ultraviolet curable adhesive 26, it is obtained as α1 × L1 × (T2 - T1) = α1 × L1 × (T2 - T1). Also, for the thermosetting adhesive 27, it is obtained as α2 × L2 × (T2 - T1) = α2 × L2 × (T2 - T1).

[0022] The relationship between the linear expansion coefficients of the ultraviolet curable adhesive 26 and the thermosetting adhesive 27 satisfies α1 > α2. Therefore, if L1 = L2, the change amount of the coating thickness has the relationship of α1 × L1 × (T2 - T1) > α2 × L2 × (T2 - T1).

[0023] Therefore, when only the thermosetting adhesive 27 with a low linear expansion coefficient is applied, it is only necessary to deform α2 × L2 × (T2 - T1). However, in the present embodiment, in addition to the thermosetting adhesive 27, the ultraviolet curable adhesive 26 with a high linear expansion coefficient is also adhered. For this reason, the thermosetting adhesive 27 will be additionally deformed by α1 × L1 × (T2 - T1) - α2 × L2 × (T2 - T1). Due to this excessive deformation, there is a possibility that the adhesive will peel off.

[0024] Therefore, in the present embodiment, in order to prevent the peeling of the adhesive, the deformation amounts of each adhesive when the temperature changes are configured to be matched. That is, ideally, by satisfying the relationship of α1×L1×(T2 - T1)=α2×L2×(T2 - T1), the relationship of L2 = L1×α1 / α2 can be derived. Since there is a step between the adhesive surface 25b and the adhesive surface 25c with respect to the optical axis (Z - Z), this relationship can be realized, and the peeling of the adhesive can be suppressed. In the present embodiment, since α1>α2, the relationship of L1<L2 is satisfied (the second thickness is larger than the first thickness). However, the present embodiment is not limited thereto, and when α1<α2, the relationship of L1>L2 is satisfied (the first thickness is larger than the second thickness).

[0025] Further, the present embodiment is not limited to the configuration that satisfies the above conditions. Preferably, the following conditional expression (1) may be satisfied.

[0026] 0.80≦(α1×L1) / (α2×L2)≦1.20 …(1) More preferably, the numerical range of the conditional expression (1) is set as the following conditional expression (1a).

[0027] 0.90≦(α1×L1) / (α2×L2)≦1.10 …(1a) Even more preferably, the numerical range of the conditional expression (1) is set as the following conditional expression (1b).

[0028] 0.95≦(α1×L1) / (α2×L2)≦1.05 …(1b) The lens unit 1 assembled according to the present embodiment can maintain the dust and water droplet proof performance and keep the optical performance in a harsh environment such as in-vehicle use.

[0029] <Second Embodiment> Next, a second embodiment of the present invention will be described with reference to Figure 3. Figure 3 is a schematic diagram of the imaging device (optical instrument) 100a in this embodiment, showing the imaging device 100a as viewed from the subject side along the optical axis direction (second direction). In this embodiment, the description of parts that are the same as in the first embodiment will be omitted, and the adhesive location between the lens barrel and the sensor holder, which is different from the first embodiment, will be described.

[0030] The lens barrel (first holding part) 101 is provided with an adhesive surface (first adhesive surface) 101a in the circumferential direction of the lens barrel 101 with respect to the optical axis (ZZ). The sensor holder (second holding part) 102 is provided with an adhesive surface (second adhesive surface) 102a facing the adhesive surface 101a, an adhesive surface (third adhesive surface) 102b, and a groove 102c for storing excess adhesive. Note that the adhesive surfaces 102a and 102b are in a stepped relationship in the direction perpendicular to the optical axis (radial direction, first direction) (adhesive surfaces 102a and 102b are positioned at different locations in the radial direction).

[0031] A UV-curing adhesive (first adhesive) 103 is partially applied in an uncured state between bonding surfaces 101a and 102a. On the other hand, a thermosetting adhesive (second adhesive) 104 is partially applied in an uncured state between bonding surfaces 101a and 102b. The UV-curing adhesive 103 and the thermosetting adhesive 104 are arranged (applied side by side in the second direction) along a direction perpendicular to the optical axis (circumferential direction, second direction).

[0032] Next, the change amount of the coating thickness of each adhesive with respect to the temperature change of the adhesive will be described. In the present embodiment, let the linear expansion coefficient of the ultraviolet curable adhesive 103 be β1 and the linear expansion coefficient of the thermosetting adhesive 104 be β2. At this time, the relationship β1>β2 is satisfied. Here, let the coating thickness (first thickness) of the ultraviolet curable adhesive 103, that is, the distance (diameter difference) in the direction perpendicular to the optical axis (first direction) between the adhesive surface 101a of the lens barrel 101 and the adhesive surface 102a of the sensor holder 102 be P1. On the other hand, let the coating thickness (second thickness) of the thermosetting adhesive 104, that is, the distance (diameter difference) in the direction perpendicular to the optical axis between the adhesive surface 101a of the lens barrel 101 and the adhesive surface 102a of the sensor holder 102 be P2.

[0033] Also, let the predetermined temperature be T3 and the temperature after the temperature change from T1 be T4. The change amount of the coating thickness of each adhesive with respect to the optical axis direction during the temperature change is obtained as follows by using the linear expansion coefficient and the coating thickness of each adhesive. That is, for the ultraviolet curable adhesive 103, it is obtained as β1×P1×(T4 - T3)=β1×P1×(T4 - T3). Also, for the thermosetting adhesive 104, it is obtained as β2×P2×(T4 - T3)=β2×P2×(T4 - T3).

[0034] The relationship between the linear expansion coefficients of the ultraviolet curable adhesive 103 and the thermosetting adhesive 104 satisfies β1>β2. Therefore, also in the present embodiment, in order to prevent the peeling of the adhesive, it is configured to match the deformation amounts of each adhesive when the temperature changes. That is, by satisfying the relationship β1×P1×(T4 - T3)=β2×P2×(T4 - T3), the relationship P2 = P1×β1 / β2 can be derived. The adhesive surface 102a and the adhesive surface 102b can realize this relationship due to the diameter difference with respect to the optical axis (Z - Z), and the peeling of the adhesive can be prevented. In the present embodiment, since β1>β2, the relationship P1<P2 is satisfied.

[0035] However, the present embodiment is not limited to this, and preferably, it may satisfy the following conditional expression (2).

[0036] 0.80 ≤ (β1 × P1) / (β2 × P2) ≤ 1.20 …(2) More preferably, the numerical range of condition (2) is set as shown in condition (2a) below.

[0037] 0.90≦(β1×P1) / (β2×P2)≦1.10 …(2a) More preferably, the numerical range of condition (2) is set as shown in condition (2b) below.

[0038] 0.95≦(β1×P1) / (β2×P2)≦1.05 …(2b) Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of its gist. Furthermore, some of the above embodiments may be combined as appropriate.

[0039] For example, in each embodiment, an ultraviolet-curing adhesive 26(103) and a thermosetting adhesive 27(104) are used, but an ultraviolet- and thermosetting adhesive (dual bond) or a self-curing adhesive may be used instead of at least one of these adhesives.

[0040] Furthermore, although the imaging unit 17 has the printed circuit board 23 attached to the sensor holder 25(102) with a screw member 24, a structure in which the case portion 19 is adhesively fixed to the sensor holder 25(102) may also be adopted.

[0041] In each embodiment, the case in which the optical device is an imaging device comprising a lens unit and imaging means has been described. However, the embodiments are not limited thereto and can also be applied to other optical devices comprising a first optical member and a second optical member for which adjustment of their relative positions is necessary.

[0042] (Manufacturing method for imaging device) Next, the manufacturing method of the imaging device for each embodiment will be described with reference to Figure 4. Figure 4 is a flowchart showing the manufacturing method of the imaging device.

[0043] First, in step S101, an ultraviolet-curing adhesive 26 (103) is applied between the adhesive surface (first adhesive surface) 6d of the lens barrel 6 (101) and the adhesive surface (second adhesive surface) 25b (102a) of the sensor holder 25 (102) (first application step). Subsequently, in step S102, a thermosetting adhesive 27 (104) is applied between the adhesive surface (first adhesive surface) 6d of the lens barrel 6 (101) and the adhesive surface (third adhesive surface) 25c (102b) of the sensor holder 25 (102) (second application step).

[0044] In the first coating step, instead of the UV-curing adhesive 26(103), a UV- and heat-curing adhesive (dual bond) that cures with both UV light and heat may be used. That is, in the first coating step, the bonding surfaces can be bonded together by at least an adhesive that cures with UV light (first adhesive).

[0045] In the second coating step, instead of the thermosetting adhesive 27(104), an ultraviolet-thermosetting adhesive (dual bond) that cures with both ultraviolet light and heat may be used. That is, in the second coating step, the bonding surfaces can be bonded together by at least a heat-curing adhesive (second adhesive).

[0046] The order of the first coating step and the second coating step may be reversed. Alternatively, the first coating step and the second coating step may be performed simultaneously.

[0047] Next, in step S103, the relative position between the lens barrel 6 (101) and the sensor holder 25 (102) is adjusted (position adjustment step). In the position adjustment step, the relative positions of the lens barrel 6 (101) and the sensor holder 25 (102) are adjusted while each is held by the arm of the adjustment device to satisfy predetermined optical performance. That is, the imaging device 100 (100a) uses the adjustment device to hold the lens barrel 6 (101) and the sensor holder 25 (102) in the air and adjusts the position of the image sensor 18 relative to the lenses 7, 8, 9, 10, and 11.

[0048] Next, in step S104, the UV-curing adhesive 26 (103) is cured with ultraviolet light (preliminary curing step). This allows the lens barrel 6 (101) and the sensor holder 25 (102), which were positioned in the position adjustment step, to be temporarily fixed in place. Next, in step S105, the thermosetting adhesive 27 (104) is cured with heat (main curing step).

[0049] According to each embodiment, it is possible to provide an optical device that can suppress the peeling of multiple adhesives caused by temperature changes.

[0050] (system) Figure 5 is a diagram of the configuration of the in-vehicle camera (imaging device) 1000 and the system (in-vehicle system, control system, driving support device) 600 equipped therewith according to this embodiment. The in-vehicle camera 1000 corresponds to the imaging device 100 (100a) in each of the embodiments described above. The system 600 is held by a movable mobile body (mobile device) such as an automobile (vehicle) and is a system for supporting the driving (operation) of the vehicle based on image information of the surroundings of the vehicle acquired by the in-vehicle camera 1000. Figure 6 is a schematic diagram of a vehicle 700 as a mobile device equipped with the system 600. In Figure 6, the imaging range 50 of the in-vehicle camera 1000 is shown set to the front of the vehicle 700, but the imaging range 50 may be set to the rear or side of the vehicle 700.

[0051] As shown in Figure 5, the system 600 comprises an in-vehicle camera 1000, a vehicle information acquisition device 1020, a control device (control unit, ECU: electronic control unit) 1030, and a warning device (warning unit) 1040. The in-vehicle camera 1000 comprises an imaging unit 1001, an image processing unit 1002, a parallax calculation unit 1003, a distance acquisition unit (acquisition unit) 1004, and a collision determination unit 1005. The processing unit is composed of the image processing unit 1002, the parallax calculation unit 1003, the distance acquisition unit 1004, and the collision determination unit 1005. The imaging unit 1001 has an optical system according to any of the embodiments described above and an image sensor.

[0052] Figure 7 is a flowchart showing an example of the operation of system 600 according to this embodiment. The operation of system 600 will be described below in accordance with this flowchart.

[0053] First, in step S1, the imaging unit 1001 is used to image objects (subjects) such as obstacles and pedestrians around the vehicle, and multiple image data (parallax image data) are acquired.

[0054] In step S2, vehicle information is acquired by the vehicle information acquisition device 1020. Vehicle information includes information such as the vehicle speed, yaw rate, and steering angle.

[0055] In step S3, the image processing unit 1002 performs image processing on the multiple image data acquired by the imaging unit 1001. Specifically, it performs image feature analysis to analyze feature quantities such as the amount, direction, and density values ​​of edges in the image data. Here, image feature analysis may be performed on each of the multiple image data, or on only some of the multiple image data.

[0056] In step S4, the disparity calculation unit 1003 calculates the disparity (image misalignment) information between multiple image data acquired by the imaging unit 1001. Known methods such as the SSDA method and the area correlation method can be used to calculate the disparity information, so a detailed explanation is omitted in this embodiment. Note that steps S2, S3, and S4 may be performed in the order described above, or they may be processed in parallel.

[0057] In step S5, the distance acquisition unit 1004 acquires (calculates) distance information from the object captured by the imaging unit 1001. The distance information can be calculated based on the parallax information calculated by the parallax calculation unit 1003, and the internal and external parameters of the imaging unit 1001. The distance information here refers to information about the relative position to the object, such as the distance from the object, the amount of defocus, and the amount of image shift. This may directly represent the distance value of the object in the image, or it may indirectly represent information corresponding to the distance value.

[0058] Then, in step S6, the collision determination unit 1005 uses the vehicle information acquired by the vehicle information acquisition device 1020 and the distance information calculated by the distance acquisition unit 1004 to determine whether the distance to the target object is within a preset distance range. This allows the system to determine whether the target object is within a preset distance around the vehicle and to determine the possibility of a collision between the vehicle and the target object. The collision determination unit 1005 determines "possibility of collision" if the target object is within the preset distance (step S7), and determines "no possibility of collision" if the target object is not within the preset distance (step S8).

[0059] Next, if the collision determination unit 1005 determines that there is a possibility of collision, it notifies (transmits) the determination result to the control device 1030 and the warning device 1040. At this time, the control device 1030 controls the vehicle based on the determination result from the collision determination unit 1005 (step S6), and the warning device 1040 issues a warning to the vehicle user (driver, passengers) based on the determination result from the collision determination unit 1005 (step S7). Note that notification of the determination result only needs to be made to at least one of the control device 1030 and the warning device 1040.

[0060] The control device 1030 can control the movement of the vehicle by outputting control signals to the vehicle's drive unit (such as the engine or motor). For example, it can control the vehicle by applying the brakes, releasing the accelerator, turning the steering wheel, and generating control signals to apply braking force to each wheel to suppress the output of the engine or motor. The warning device 1040 can also warn the user by, for example, emitting a warning sound (alarm), displaying warning information on a screen such as a car navigation system, or vibrating the seat belt or steering wheel.

[0061] As described above, the system 600 according to this embodiment enables effective detection of objects through the above processing, making it possible to avoid collisions between the vehicle and the objects. In particular, by applying the optical systems according to each of the embodiments described above to the system 600, it becomes possible to miniaturize the entire in-vehicle camera 1000, increasing the flexibility of placement, while enabling object detection and collision detection over a wide field of view.

[0062] Regarding the calculation of distance information, various embodiments are conceivable. As an example, we will describe a case in which a pupil-splitting type image sensor having multiple pixel sections regularly arranged in a two-dimensional array is used as the image sensor of the imaging unit 1001. In a pupil-splitting type image sensor, one pixel section is composed of a microlens and multiple photoelectric conversion units, and can receive a pair of light beams passing through different regions in the pupil of the optical system, and output a pair of image data from each photoelectric conversion unit.

[0063] Then, the amount of image displacement in each region is calculated by correlation calculation between paired image data, and the distance acquisition unit 1004 calculates image displacement map data representing the distribution of the image displacement amounts. Alternatively, the distance acquisition unit 1004 may further convert the image displacement amounts into defocus amounts and generate defocus map data representing the distribution of defocus amounts (distribution on a two-dimensional plane of the captured image). The distance acquisition unit 1004 may also acquire distance map data of the distance to the object converted from the defocus amounts.

[0064] Furthermore, the system 600 and the vehicle (mobility device) 700 may be equipped with a notification device (notification unit) to notify the system manufacturer or the mobile device dealer in the event that the vehicle 700 collides with an obstacle. For example, the notification device may be one that sends information regarding the collision between the vehicle 700 and the obstacle (collision information) to a pre-set external notification destination via email or the like.

[0065] In this way, by adopting a configuration in which collision information is automatically notified by the notification device, it is possible to promptly take action such as inspection and repair after a collision occurs. The recipients of the collision information may be insurance companies, medical institutions, the police, or any other recipients set by the user. Furthermore, the notification device may be configured to notify recipients not only of collision information, but also of malfunction information of various parts and information on the wear and tear of consumables. The detection of whether or not a collision has occurred may be performed using distance information acquired based on the output from the imaging unit 1001 (imaging means 2) described above, or it may be performed by other detection units (sensors).

[0066] In this embodiment, the system 600 was applied to driver assistance (collision damage mitigation), but it is not limited to this, and the system 600 may also be applied to cruise control (including with full-speed following function) or autonomous driving. Furthermore, the system 600 can be applied not only to vehicles such as automobiles, but also to mobile objects such as ships, aircraft, and industrial robots. Moreover, it can be applied not only to mobile objects, but also to various devices that utilize object recognition, such as intelligent transportation systems (ITS).

[0067] Each embodiment of the disclosure includes the following configuration and method. (Composition 1) A first holding part that holds the first element, It has a second holding part that holds the second element, The first retaining portion has a first adhesive surface, The second retaining portion has a second adhesive surface and a third adhesive surface that face the first adhesive surface, The first adhesive surface and the second adhesive surface are bonded to each other by the first adhesive. The first adhesive surface and the third adhesive surface are bonded to each other by the second adhesive. The first linear expansion coefficient of the first adhesive and the second linear expansion coefficient of the second adhesive are different from each other. An optical instrument characterized in that the first thickness of the first adhesive and the second thickness of the second adhesive in the first direction are different from each other. (Configuration 2) The optical device according to configuration 1, characterized in that the second adhesive surface and the third adhesive surface are arranged at different positions from each other in the first direction. (Composition 3) When the first coefficient of linear expansion is α1, the second coefficient of linear expansion is α2, the first thickness is L1, and the second thickness is L2, 0.80 ≤ (α1 × L1) / (α2 × L2) ≤ 1.20 An optical instrument according to configuration 1 or 2, characterized by satisfying the following conditional expression. (Composition 4) An optical instrument according to any one of configurations 1 to 3, characterized in that a groove is provided between the second adhesive surface and the third adhesive surface. (Composition 5) The optical instrument according to any one of configurations 1 to 4, characterized in that the first direction is the optical axis direction. (Composition 6) The optical instrument according to any one of configurations 1 to 4, characterized in that the first direction is perpendicular to the optical axis direction. (Composition 7) The optical instrument according to any one of configurations 1 to 5, characterized in that the first adhesive and the second adhesive are arranged along a second direction perpendicular to the first direction. (Composition 8) The optical device according to any one of configurations 1 to 7, characterized in that the first adhesive and the second adhesive have different curing speeds. (Composition 9) The second adhesive has a slower curing rate than the first adhesive. The optical instrument according to configuration 8, characterized in that the second area on which the second adhesive is applied to the third bonding surface is larger than the first area on which the first adhesive is applied to the second bonding surface. (Composition 10) The optical device according to configuration 8 or 9, characterized in that the first adhesive is an adhesive that hardens with ultraviolet light. (Composition 11) The optical instrument according to any one of configurations 8 to 10, characterized in that the second adhesive is a heat-curing adhesive. (Composition 12) The optical instrument according to any one of configurations 8 to 11, characterized in that the first adhesive is positioned further from the optical axis than the second adhesive. (Composition 13) The optical instrument according to any one of configurations 1 to 12, characterized in that the second thickness is greater than the first thickness. (Composition 14) The optical instrument according to any one of configurations 1 to 12, characterized in that the first thickness is greater than the second thickness. (Composition 15) The first element described above is an optical element, The optical device according to any one of configurations 1 to 14, characterized in that the second element is an image sensor. (Composition 16) The first element described above is an image sensor, The optical device according to any one of configurations 1 to 14, characterized in that the second element is an optical element. (Composition 17) A system characterized by comprising an optical device described in any of configurations 1 to 16, and a determination unit that determines the possibility of collision between a moving device and an object based on distance information of an object obtained based on the output of the optical device. (Composition 18) A mobile device comprising an optical instrument as described in any of configurations 1 to 16, and characterized in that it is capable of holding and moving the optical instrument. (Method 1) The steps include applying a first adhesive between the first adhesive surface of the first holding portion that holds the first element and the second adhesive surface of the second holding portion that holds the second element, which is opposite to the first adhesive surface, The steps include applying a second adhesive between the first adhesive surface and the third adhesive surface of the second holding part, The steps include adjusting the relative position between the first holding part and the second holding part, The first step of curing the adhesive, The process includes the step of curing the second adhesive, The first linear expansion coefficient of the first adhesive and the second linear expansion coefficient of the second adhesive are different from each other. A method for manufacturing an optical instrument, characterized in that the first thickness of the first adhesive and the second thickness of the second adhesive in the first direction are different from each other. (Method 2) A method for manufacturing an optical instrument according to Method 1, characterized in that, in the step of adjusting the relative position, the relative position is adjusted so that the optical instrument satisfies predetermined optical performance.

[0068] Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of its gist. [Explanation of symbols]

[0069] 6. 101 Telescope tube (first retaining part) 6d, 101a Adhesive surface (first adhesive surface) 7, 8, 9, 10, 11 Lenses (first element) 18 Image sensor (second element) 25, 102 Sensor holder (second holding part) 25b, 102a Adhesive surface (second adhesive surface) 25c, 102b Adhesive surface (third adhesive surface) 26, 103 UV-curing adhesive 27, 104 Thermosetting adhesive 100, 100a Imaging device (optical instrument)

Claims

1. A first holding part that holds the first element, It has a second holding part that holds a second element, The first retaining portion has a first adhesive surface, The second retaining portion has a second adhesive surface and a third adhesive surface that face the first adhesive surface, The first adhesive surface and the second adhesive surface are bonded to each other by the first adhesive. The first adhesive surface and the third adhesive surface are bonded to each other by the second adhesive. The first linear expansion coefficient of the first adhesive and the second linear expansion coefficient of the second adhesive are different from each other. An optical instrument characterized in that the first thickness of the first adhesive and the second thickness of the second adhesive in the first direction are different from each other.

2. The optical device according to claim 1, characterized in that the second adhesive surface and the third adhesive surface are arranged at different positions from each other in the first direction.

3. When the first coefficient of linear expansion is α1, the second coefficient of linear expansion is α2, the first thickness is L1, and the second thickness is L2, 0.80 ≤ (α1 × L1) / (α2 × L2) ≤ 1.20 The optical instrument according to claim 1, characterized in that it satisfies the following condition.

4. The optical device according to claim 1, characterized in that a groove is provided between the second adhesive surface and the third adhesive surface.

5. The optical device according to claim 1, characterized in that the first direction is the optical axis direction.

6. The optical device according to claim 1, characterized in that the first direction is a direction perpendicular to the optical axis direction.

7. The optical device according to claim 1, characterized in that the first adhesive and the second adhesive are arranged along a second direction perpendicular to the first direction.

8. The optical device according to claim 1, characterized in that the first adhesive and the second adhesive have different curing speeds.

9. The second adhesive has a slower curing rate than the first adhesive. The optical device according to claim 8, characterized in that the second area on which the second adhesive is applied to the third bonding surface is larger than the first area on which the first adhesive is applied to the second bonding surface.

10. The optical device according to claim 8, characterized in that the first adhesive is an adhesive that hardens with ultraviolet light.

11. The optical device according to claim 8, characterized in that the second adhesive is a heat-curing adhesive.

12. The optical device according to claim 8, characterized in that the first adhesive is positioned further from the optical axis than the second adhesive.

13. The optical device according to claim 1, characterized in that the second thickness is greater than the first thickness.

14. The optical device according to claim 1, characterized in that the first thickness is greater than the second thickness.

15. The first element is an optical element, The optical device according to claim 1, characterized in that the second element is an image sensor.

16. The first element is an image sensor, The optical device according to claim 1, characterized in that the second element is an optical element.

17. A system comprising an optical device according to any one of claims 1 to 16, and a determination unit that determines the possibility of collision between a moving device and an object based on distance information of an object obtained based on the output of the optical device.

18. A mobile device comprising an optical instrument according to any one of claims 1 to 16, and characterized in that it is capable of holding and moving the optical instrument.

19. The steps include applying a first adhesive between the first adhesive surface of the first holding portion that holds the first element and the second adhesive surface of the second holding portion that holds the second element, which is opposite to the first adhesive surface, The steps include applying a second adhesive between the first adhesive surface and the third adhesive surface of the second holding part, The steps include adjusting the relative position between the first holding part and the second holding part, The first step of curing the adhesive, The process includes the step of curing the second adhesive, The first linear expansion coefficient of the first adhesive and the second linear expansion coefficient of the second adhesive are different from each other. A method for manufacturing an optical instrument, characterized in that the first thickness of the first adhesive and the second thickness of the second adhesive in the first direction are different from each other.

20. The method for manufacturing an optical instrument according to claim 19, characterized in that, in the step of adjusting the relative position, the relative position is adjusted so that the optical instrument satisfies predetermined optical performance.

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