Optical device, imaging device, imaging system, and mobile device

Abstract

To provide an optical device preventing adhesive from flowing into the periphery of a lens while increasing adhesion area between the lens and a barrel.SOLUTION: An optical device (1) comprises: a lens (3) including a first flat surface (32) provided outside an effective area; support means (2) including an inner peripheral surface (24) located farther from an optical axis (4) than the lens, a second flat surface (22) closer to the optical axis than the inner peripheral surface, and a bottom surface (25) located farther from the lens in an optical axis direction than the second flat surface; and adhesive (7) bonding the first and second flat surfaces to each other. Extension surfaces (26) of the first and second flat surfaces intersect with the optical axis. The extension surface, the inner peripheral surface and the bottom surface of the second flat surface form a retreat part (6) for accommodating adhesive leaking from between the first and second flat surfaces. The volume of the retreat part is greater than half the volume of the adhesive.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an optical device, an imaging device, an in-vehicle system, and a mobile device. [Background technology]

[0002] Patent Document 1 discloses a configuration in which a recess is provided in the lens or lens barrel, and a portion of the adhesive applied to the recess is extruded toward the periphery of the recess to bond the lens and lens barrel together. This configuration prevents the adhesive from flowing onto the periphery of the lens, and suppresses lens displacement caused by changes in environmental temperature. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-123103 Summary of the Invention [Problem to be solved by the invention]

[0004] With the configuration disclosed in Patent Document 1, it is difficult to increase the bonding area between the lens and the lens barrel, and there is a possibility that sufficient bonding strength cannot be ensured. Therefore, an object of the present invention is to provide an optical device, an imaging device, an in-vehicle system, and a mobile device that can increase the adhesive area between the lens and the lens barrel while preventing adhesive from flowing onto the outer periphery of the lens. [Means for solving the problem]

[0005] An optical device according to one aspect of the present invention includes a lens having a first flat surface provided outside an effective area, a support means having an inner peripheral surface farther from an optical axis than the lens, a second flat surface closer to the optical axis than the inner peripheral surface, and a bottom surface farther from the lens in the optical axis direction than the second flat surface, and an adhesive that bonds the first and second flat surfaces together; the lens and the support means are closest to each other between the first plane and the second plane;The outermost diameter surface and the inner peripheral surface of the lens , in the radial direction without the adhesive interposed therebetween. The first and second planes are spaced apart from each other, and the extension surfaces of the first and second planes intersect with the optical axis. The extension surface of the second plane, the inner peripheral surface, and the bottom surface form a recess into which the adhesive leaking from between the first and second planes enters, and the volume of the recess is greater than half the volume of the adhesive.

[0006] Other objects and features of the present invention will be described in the following embodiments. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide an optical device, an imaging device, an in-vehicle system, and a mobile device that can increase the adhesive area between the lens and the lens barrel while preventing adhesive from flowing onto the outer periphery of the lens. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of a main part of an optical device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a view of the lens barrel of the present embodiment as seen from the optical axis direction. [Figure 3] 1 is a cross-sectional view of a main part of an optical device according to an embodiment of the present invention, in which an adhesive is applied to a lens barrel before assembly. [Figure 4] 1 is a cross-sectional view of a main part of an optical device to which an adhesive is applied in the present embodiment. [Figure 5] FIG. 10 is a cross-sectional view of a main part of an optical device as a first modified example of the present embodiment. [Figure 6] FIG. 10 is a cross-sectional view of a main part of an optical device as a second modified example of the present embodiment. [Figure 7] FIG. 10 is a cross-sectional view of a main part of an optical device as a third modified example of the present embodiment. [Figure 8] FIG. 10 is a cross-sectional view of a main part of a lens as a third modified example of the present embodiment. [Figure 9] FIG. 10 is a cross-sectional view of a main part of a lens as a fourth modified example of the present embodiment. [Figure 10] FIG. 10 is a cross-sectional view of a main part of a lens as a fifth modified example of the present embodiment. [Figure 11] FIG. 10 is a cross-sectional view of a main part of a lens as a sixth modified example of the present embodiment. [Figure 12] 1 is a block diagram of an in-vehicle system including an optical device according to an embodiment of the present invention. [Figure 13] 1 is a schematic diagram of a main part of a vehicle equipped with an optical device according to an embodiment of the present invention. [Figure 14] 4 is a flowchart showing an example of the operation of an in-vehicle system including an optical device according to the present embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0010] First, the configuration of an optical device (lens device) 1 according to this embodiment will be described with reference to Figures 1 and 2. Figure 1 is a cross-sectional view of a main portion of the optical device 1. Figure 2 is a view of a lens barrel 2 viewed from the optical axis direction. The optical device 1 has a lens 3, a lens barrel (support means) 2 that adheres and supports the lens 3, and an adhesive layer 5 formed of an adhesive 7 (see Figure 3) that adheres the lens 3 to the lens barrel 2. Note that the lens 3 and the lens barrel 2 do not contact each other in a direction perpendicular to the optical axis 4 (radial direction). However, the present invention is not limited to this, and there may be localized contact.

[0011] Lens 3 can be any of various known lenses, and can be appropriately selected taking into consideration the optical characteristics that optical device 1 should have. Lens 3 has a flat area (first flat surface) 32 that is approximately perpendicular to optical axis 4 outside the effective area (area outside the effective diameter). Furthermore, in lens 3, the area of ​​flat area 32 that is the shortest distance from lens barrel 2 (for example, the distance in the optical axis direction) is adhesive surface 31 that is adhered by adhesive layer 5. Note that flat area 32 does not have to be perpendicular to optical axis 4.

[0012] The lens barrel 2 is a generally cylindrical member made of metal or resin. A receiving portion 21 is formed on an inner peripheral surface 24 of the lens barrel 2, protruding in a direction generally perpendicular to the central axis (optical axis 4) of the cylindrical lens barrel 2. The receiving portion 21 is formed, for example, around the entire circumference of the inner peripheral surface 24 of the lens barrel 2. The height of the receiving portion 21 protruding from the inner peripheral surface 24 of the lens barrel 2 is set to a value such that the receiving portion 21 does not protrude into the effective diameter of the lens 3 to be bonded. For this reason, as shown in FIG. 2 , the receiving portion 21 has a generally donut-like shape when viewed from the direction of the central axis (optical axis direction). One surface of the receiving portion 21 in the direction of the central axis is a bonding surface perpendicular to the central axis, and the optical device 1 is formed by bonding the lens 3 to one surface of the receiving portion 21 with an adhesive. In the following description, this one surface of the receiving portion 21 will be referred to as a bonding surface (second flat surface) 22. The adhesive surface 22 does not have to be perpendicular to the central axis.

[0013] As shown in FIGS. 1 and 2 , a retraction section 6 is formed adjacent to the adhesive surface 22 of the lens barrel 2 as a space for retracting any excess adhesive that does not fit into the adhesive layer 5. The retraction section 6 is formed in a circular ring shape centered on the optical axis 4, but this is not a limitation. While the retraction section 6 is shown in FIG. 1 as a recess with a predetermined depth (finite depth) relative to the lens barrel 2, this is not a limitation and the retraction section may be a through-hole that penetrates the lens barrel 2 in the optical axis direction. When the retraction section 6 has a finite depth, the difference in height between the adhesive surface 22 and the retraction section bottom surface 25 (the length in the optical axis direction between the adhesive surface 22 and the retraction section bottom surface 25) is preferably set to 0.3 mm or greater. This is to ensure that the retraction section 6 captures any excess adhesive, taking into account variations in the dimensions of the components and the amount of adhesive applied.

[0014] In this embodiment, the type of adhesive applied to adhesive surface 22 is not particularly limited, and various known adhesives such as two-component, UV-curable, or heat-curable adhesives can be used. Furthermore, in this embodiment, the method of manufacturing lens barrel 2 is not particularly limited, and for example, it can be formed by casting or cutting when the material is metal, or by injection molding when the material is resin. Retraction portion 6 may be formed simultaneously with the casting or molding of lens barrel 2, or it may be formed by, for example, cutting receiving portion 21 after the basic shape of lens barrel 2 is manufactured without retraction portion 6.

[0015] 3 and 4, a method for applying adhesive 7 to the lens barrel 2 and assembling the lens barrel 2 and the lens 3 will be described. Fig. 3 is a cross-sectional view of the main parts of the optical device 1 before assembly, with adhesive 7 applied to the lens barrel 2. Fig. 4 is a cross-sectional view of the main parts of the optical device 1 with adhesive 7 applied.

[0016] As shown in FIG. 3 , adhesive 7 is applied to adhesive surface 22 of lens barrel 2. When lens 3 is assembled to lens barrel 2, adhesive 7 spreads in the radial direction and overflows from adhesive surface 22 as shown in FIG. 4 . In this embodiment, adhesive surface 22 of lens barrel 2 and flat area 32 of lens 3 are each configured to be substantially perpendicular to optical axis 4. Therefore, half of the adhesive 7 that does not fit into adhesive layer 5 overflows in the direction away from optical axis 4, and the other half overflows from adhesive layer 5 in the direction toward optical axis 4. Therefore, the volume of retracted portion 6 needs to be larger than half the volume (total volume) of adhesive 7 applied to adhesive surface 22. Note that adhesive surface 22 of lens barrel 2 and flat area 32 of lens 3 do not need to be perpendicular to optical axis 4.

[0017] In general, it is difficult to suppress variations in the amount of adhesive 7 applied, which is a fluid. Furthermore, the lens barrel 2 also has dimensional variations. Therefore, the volume of the retraction section 6 must be sufficient to account for these variations. Therefore, the volume of the retraction section 6 is preferably set to be approximately equal to the volume of adhesive 7 applied to the adhesive surface 22. More preferably, the volume of the retraction section 6 is greater than the volume of adhesive 7. Here, the volume of the retraction section 6 is the space enclosed by a plane (extension surface) 26 that includes the adhesive surface 22 and intersects with the optical axis 4, an inner circumferential surface 24 of the lens barrel 2 (the surface farthest from the optical axis 4 among the side surfaces forming the retraction section 6), a retraction section slope (inclined surface) 23, and a retraction section bottom surface 25, as shown in FIG. 1 . Note that in this embodiment, the inner circumferential surface 24 may have a discontinuous shape. For example, the surface farthest from the optical axis 4 among the side surfaces forming the retraction section 6 among the inner circumferential surface 24 may have a step that protrudes toward the optical axis 4. Also in this case, the surface farthest from the optical axis 4 is located farther from the optical axis 4 than the lens, and the outermost diameter of the retracted portion 6 is larger than the outermost diameter of the flat area.

[0018] Thereafter, adhesive 7 is cured by irradiating it with ultraviolet light, leaving it for a predetermined time, or leaving it at a constant temperature, depending on the curing conditions of adhesive 7. This forms adhesive layer 5 that bonds lens 3 and lens barrel 2 together, and optical device 1 in which lens 3 and lens barrel 2 are bonded together is completed.

[0019] In the optical device 1 of this embodiment, as shown in FIG. 4 , all of the adhesive 7 that has protruded from the adhesive layer 5 and moved in a direction away from the optical axis 4 is accommodated in the retracted portion 6. Therefore, even when the adhesive 7 hardens and shrinks, only a force parallel to the optical axis 4 acts on the lens 3. This prevents the radial position of the lens 3 bonded to the lens barrel 2 from moving unstably relative to the lens barrel 2 during the bonding process. As a result, it is possible to configure the optical device 1 in which the lens 3 and the lens barrel 2 are bonded together with high precision and positioned therebetween. This is also effective in a configuration in which the lens 3 is press-fitted radially into the lens barrel 2, or in a configuration in which the position of the lens 3 is adjusted radially relative to the lens barrel 2.

[0020] 1, retraction section slope 23, which forms part of retraction section 6 from adhesive surface 22 of lens barrel 2 to retraction section bottom surface 25 (adjacent to adhesive surface 22), is formed so that its interior angle with adhesive surface 22 forms angle θ (a predetermined angle). In this embodiment, from the standpoints of manufacturing and miniaturization of optical device 1, it is preferable that angle θ (degrees) satisfy the condition 90≦θ<180.

[0021] In this embodiment, the shape of the retraction slope 23 in a cross section including the optical axis 4 of the optical device 1 does not have to be a linear shape (planar shape) on the cross section as shown in FIG. 1, but may be, for example, a curved shape (curved surface shape). FIGS. 5 and 6 are cross-sectional views of essential parts of optical devices 1a and 1b as first and second modified examples of this embodiment, respectively. As shown in FIG. 5, the optical device 1a has a retraction slope 23a in a curved shape that is convex toward the lens 3 in a cross section including the optical axis 4, and the retraction slope 23a forms the retraction slope 6a. As shown in FIG. 6, the optical device 1b has a retraction slope (curved surface) 23b in a curved shape that is concave toward the lens 3 in a cross section including the optical axis 4, and the retraction slope 6b forms the retraction slope 23b.

[0022] In this embodiment, the structure for forming the retraction portion 6, which is a space for the adhesive 7 that does not fit into the adhesive layer 5, may be provided in the lens 3 instead of the lens barrel 2. FIG. 7 is a cross-sectional view of a main portion of an optical device 1c as a third modified example of this embodiment. As shown in FIG. 7, the optical device 1c includes a lens 3a having a retraction portion forming surface (inclined surface) 34 for forming the retraction portion 6c, and a lens barrel 2c. The retraction portion forming surface 34 is disposed adjacent to the outermost diameter surface 33 of the lens 3a.

[0023] The following explains the interpretation of the volume of the retracted portion 6c in this case. Figure 8 is a cross-sectional view of a main part of the lens 3a in a cross section including the optical axis 4 of the optical device 1c. The retracted portion 6c is a space surrounded by a plane 35 including the bonded surface 31 of the lens 3a, a lens contour surface 36 including the outermost diameter surface 33, and the retracted portion forming surface 34, and the volume of this space is the volume of the retracted portion 6c.

[0024] In this embodiment, the shape of the retracted-portion forming surface 34 in a cross section including the optical axis 4 of the optical device 1c is not limited to the inclined surface shape shown in FIG. 7 (the shape in which the retracted-portion forming surface 34 linearly connects the bonded surface 31 and the outermost diameter surface 33). FIGS. 9 to 11 are cross-sectional views of essential parts of lenses 3b, 3c, and 3d as fourth to sixth modified examples of this embodiment, respectively. As shown in FIG. 9, in the lens 3b as the fourth modified example, the retracted-portion forming surface 34a has a linear shape substantially parallel to the optical axis 4 in a cross section including the optical axis 4. As shown in FIG. 10, in the lens 3c as the fifth modified example, the retracted-portion forming surface 34b has a concave curved shape (including a curved surface) toward the lens barrel 2 in a cross section including the optical axis 4. As shown in FIG. 11, in the lens 3d as the sixth modified example, the retracted-portion forming surface 34c has a convex curved shape (including a curved surface) toward the lens barrel 2 in a cross section including the optical axis 4.

[0025] Furthermore, in this embodiment, the retraction section 6 may be formed by a structure in which a shape that functions as the retraction section 6 is formed on both the lens 3 and the lens barrel 2. Note that the optical device 1 of this embodiment may include multiple lenses. In this case, it is sufficient that at least one of the multiple lenses is fixed to the lens barrel 2 as the lens 3 by the structure described above. Preferably, the lens 3 is the lens of the multiple lenses that is arranged closest to the object.

[0026] (In-vehicle system) Next, with reference to Figs. 12 to 14, an on-board camera 100 equipped with the optical device of this embodiment and an on-board system (driving assistance device) 600 equipped with the on-board camera 100 will be described. Fig. 12 is a configuration diagram of the on-board camera 100 and the on-board system 600 equipped with the same. The on-board system 600 is held by a movable body (mobile device) such as an automobile (vehicle) and is a system for assisting the driving (piloting) of the vehicle based on image information of the surroundings of the vehicle acquired by the on-board camera 100. Fig. 13 is a schematic diagram of a vehicle 700 as a mobile device equipped with the on-board system 600. Fig. 13 shows a case where the imaging range 500 of the on-board camera 100 is set in front of the vehicle 700, but the imaging range 500 may also be set behind or to the side of the vehicle 700.

[0027] 12, the in-vehicle system 600 includes an in-vehicle camera 100, a vehicle information acquisition device 200, a control device (controller, ECU: Electronic Control Unit) 300, and a warning device (warning unit) 400. The in-vehicle camera 100 also includes an imaging unit (imaging device) 101, an image processing unit 102, a parallax calculation unit 103, a distance acquisition unit (acquisition unit) 104, and a collision determination unit 105. The image processing unit 102, the parallax calculation unit 103, the distance acquisition unit 104, and the collision determination unit 105 constitute a processing unit. The imaging unit 101 includes an optical system (optical device) according to any one of the above-described embodiments and an imaging element.

[0028] 14 is a flowchart showing an example of the operation of the in-vehicle system 600 according to this embodiment. The operation of the in-vehicle system 600 will be described below with reference to this flowchart.

[0029] First, in step S1, the imaging unit 101 captures images of objects (subjects) such as obstacles and pedestrians around the vehicle, and acquires a plurality of image data (parallax image data).

[0030] In step S2, vehicle information is acquired by the vehicle information acquisition device 200. The vehicle information includes the vehicle speed, yaw rate, steering angle, and the like.

[0031] In step S3, the image processing unit 102 performs image processing on the multiple image data acquired by the imaging unit 101. Specifically, image feature analysis is performed to analyze feature quantities such as the amount and direction of edges in the image data and density values. Here, the image feature analysis may be performed on each of the multiple image data, or may be performed on only some of the multiple image data.

[0032] In step S4, the disparity (image shift) information between the multiple image data acquired by the imaging unit 101 is calculated by the disparity calculation unit 103. As a method for calculating the disparity information, a known method such as the SSDA method or the area correlation method can be used, and therefore a description thereof will be omitted in this embodiment. Note that steps S2, S3, and S4 may be performed in the above order, or may be processed in parallel with each other.

[0033] In step S5, distance information about the object captured by the imaging unit 101 is acquired (calculated) by the distance acquisition unit 104. The distance information can be calculated based on the parallax information calculated by the parallax calculation unit 103 and internal and external parameters of the imaging unit 101. Note that the distance information here refers to information about the relative position of the object, such as the distance from the object, the amount of defocus, and the amount of image shift, and may directly represent the distance value of the object in the image or indirectly represent information corresponding to the distance value.

[0034] Then, in step S6, the collision determination unit 105 determines whether the distance to the object is within a preset distance range using the vehicle information acquired by the vehicle information acquisition device 200 and the distance information calculated by the distance acquisition unit 104. This makes it possible to determine whether an object exists within a set distance around the vehicle and determine the possibility of a collision between the vehicle and the object. If an object exists within the set distance, the collision determination unit 105 determines that there is a "possibility of collision" (step S7), and if there is no object within the set distance, it determines that there is "no possibility of collision" (step S8).

[0035] Next, when the collision determination unit 105 determines that there is a "possibility of collision," it notifies (transmits) the determination result to the control device 300 and the warning device 400. At this time, the control device 300 controls the vehicle based on the determination result of the collision determination unit 105 (step S6), and the warning device 400 issues a warning to the vehicle user (driver, passengers) based on the determination result of the collision determination unit 105 (step S7). The notification of the determination result may be sent to at least one of the control device 300 and the warning device 400.

[0036] The control device 300 can control the movement of the vehicle by outputting control signals to the drive units (engine, motor, etc.) of the vehicle. For example, it performs control such as applying the brakes on the vehicle, releasing the accelerator, turning the steering wheel, and generating control signals to generate braking forces on each wheel to suppress the output of the engine or motor. In addition, the warning device 400 warns the user by, for example, issuing a warning sound (alarm), displaying warning information on the screen of a car navigation system, or applying vibrations to the seat belt or steering wheel.

[0037] As described above, the in-vehicle system 600 according to this embodiment can effectively detect an object through the above-described processing, thereby making it possible to avoid a collision between the vehicle and the object. In particular, by applying the optical device (optical system) according to the above-described embodiment to the in-vehicle system 600, it becomes possible to detect an object and determine a collision over a wide angle of view while reducing the overall size of the in-vehicle camera 100 and increasing the degree of freedom in placement.

[0038] Note that various embodiments are possible for calculating the distance information. As an example, a case will be described in which a split-pupil image sensor (light receiving unit) having a plurality of pixel units arranged regularly in a two-dimensional array is used as the image sensor of the image capturing unit 101. In the split-pupil image sensor, one pixel unit is composed of a microlens and a plurality of 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.

[0039] Then, the image shift amount for each region is calculated by a correlation calculation between paired image data, and image shift map data representing the distribution of the image shift amount is calculated by the distance acquisition unit 104. Alternatively, the distance acquisition unit 104 may further convert the image shift amount into a defocus amount to generate defocus map data representing the distribution of the defocus amount (distribution on a two-dimensional plane of the captured image). Furthermore, the distance acquisition unit 104 may acquire distance map data of the distance to the object converted from the defocus amount.

[0040] Furthermore, the in-vehicle system 600 and the vehicle 700 may be provided with a notification device (notification unit) for notifying the manufacturer of the in-vehicle system or the distributor (dealer) of the mobile device, etc., if the vehicle 700 collides with an obstacle. For example, the notification device may be one that transmits information (collision information) related to the collision between the vehicle 700 and an obstacle to a preset external notification destination by e-mail or the like.

[0041] In this way, by adopting a configuration in which the notification device automatically notifies collision information, it is possible to promptly take measures such as inspection and repair after a collision occurs. The destination of the collision information may be an insurance company, a medical institution, the police, or any other party set by the user. Furthermore, the notification device may be configured to notify the destination not only of collision information but also of malfunction information of each part and information on consumption of consumables. The detection of the presence or absence of a collision may be performed using distance information acquired based on the output from the above-mentioned light receiving unit, or may be performed by another detection unit (sensor).

[0042] In this embodiment, the in-vehicle system 600 is applied to driving assistance (collision damage reduction), but the application is not limited to this. The in-vehicle system 600 may also be applied to cruise control (including an all-speed tracking function) or autonomous driving. The in-vehicle system 600 is not limited to vehicles such as automobiles, but can be applied to moving bodies such as ships, aircraft, and industrial robots. The in-vehicle system 600 is not limited to moving bodies, but can be applied to various devices that use object recognition, such as intelligent transport systems (ITS).

[0043] As described above, the optical device of this embodiment includes a lens and a support means for fixing the lens using an adhesive. The lens has a first plane perpendicular to the optical axis in a region outside the effective diameter. The receiving portion has a second plane perpendicular to the optical axis. The adhesive forms an adhesive layer between the first plane and the second plane. The distance between the first plane and the second plane in the optical axis direction is the narrowest of the distances between the lens and the support means in the optical axis direction. At a position farther from the optical axis than the adhesive layer, the lens and the receiving portion form a retreat portion for retreating at least a portion of the adhesive that leaks from between the first plane and the second plane. The volume of the retreat portion is greater than half the total volume of the adhesive.

[0044] According to this embodiment, it is possible to provide an optical device, an imaging device, an in-vehicle system, and a mobile device that can increase the adhesive area between the lens and the lens barrel while preventing adhesive from flowing onto the outer periphery of the lens.

[0045] Although the 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 the gist of the present invention.

[0046] In the above-described embodiment, the optical device is applied to the vehicle-mounted camera 100 as a distance measuring device, but the optical device may also be applied to a vehicle-mounted camera other than a distance measuring device. For example, the vehicle-mounted camera may be disposed at the rear or side of the vehicle, and the acquired image information may be displayed on a display unit (monitor) inside the vehicle to provide driving assistance. In this case, components used for distance measurement, such as a parallax calculation unit, a distance acquisition unit, and a collision determination unit, may not be provided.

[0047] In the above-described embodiment, the optical device is applied to an imaging unit in an in-vehicle system, but the present invention is not limited to this. For example, the optical device may be applied to imaging devices such as digital still cameras, digital video cameras, and silver halide film cameras, or may be applied to optical instruments such as telescopes and projection devices such as projectors. [Explanation of symbols]

[0048] 1 Optical device 2 Lens barrel (support means) 3 Lenses 5 Adhesive layer 6 Retreat section 7. Adhesive 22 Adhesion surface (second plane) 24 Inner surface 25 Bottom of evacuation section (bottom) 26 plane (extension plane) 32 Planar area (first plane)

Claims

1. a lens having a first plane provided outside the effective area; a support means having an inner circumferential surface farther from the optical axis than the lens, a second flat surface closer to the optical axis than the inner circumferential surface, and a bottom surface farther from the lens in the optical axis direction than the second flat surface; an adhesive that bonds the first plane and the second plane to each other; the lens and the support means are closest to each other between the first plane and the second plane; the outermost diameter surface and the inner circumferential surface of the lens are spaced apart from each other in the radial direction without the adhesive therebetween, an extension plane of each of the first plane and the second plane intersects with the optical axis; an extension surface of the second flat surface, the inner circumferential surface, and the bottom surface form a retreat portion into which the adhesive leaking from between the first flat surface and the second flat surface enters; An optical device, characterized in that the volume of the retracted portion is larger than half the volume of the adhesive.

2. 2. The optical device according to claim 1, wherein the lens is supported by the support means only via the first plane.

3. 3. The optical device according to claim 1, wherein the retracted portion is adjacent to at least one of the first plane and the second plane.

4. 4. The optical device according to claim 1, wherein the retracted portion is a recess or a through hole in a cross section including the optical axis.

5. the support means has an inclined surface adjacent to the second plane and forming a part of the shape of the retracted portion, When the interior angle formed between the second plane and the inclined surface in a cross section including the optical axis is θ (degrees), 90≦θ<180 5. The optical device according to claim 1, wherein the following condition is satisfied:

6. the support means has an inclined surface adjacent to the second plane and forming a part of the shape of the retracted portion, 5. The optical device according to claim 1, wherein the inclined surface is inclined with respect to the second plane and includes a curve in a cross section including the optical axis.

7. 7. The optical device according to claim 1, wherein the lens has an end surface that is provided between the outermost diameter surface and the first flat surface and that forms a part of the retracted portion.

8. the lens has an end surface that forms a part of the retracted portion, 5. The optical device according to claim 1, wherein the end face is non-parallel to the outermost diameter surface and the first plane.

9. 9. The optical device according to claim 8, wherein the end face is non-perpendicular to the optical axis.

10. 10. The optical device according to claim 1, wherein the retracted portion is formed around the entire circumference of the optical axis.

11. 11. The optical device according to claim 1, wherein the lens is arranged closest to the object among a plurality of lenses provided in the optical device.

12. 12. The optical device according to claim 1, wherein the retracted portion communicates with the outside of the support means via a space between the outermost diameter surface and the inner circumferential surface.

13. An optical device described in any one of claims 1 to 12, characterized in that the adhesive bonds the lens and the support means between the first plane and the second plane without being interposed between the outermost diameter surface and the inner peripheral surface of the lens.

14. An imaging apparatus comprising: the optical device according to claim 1; and an imaging element that captures an image of an object via the optical device.

15. 15. An imaging system comprising: the imaging device according to claim 14; and a determination unit that determines a possibility of a collision between a mobile device and the object based on distance information of the object acquired by the imaging device.

16. A moving device comprising the imaging device according to claim 14, and capable of moving while holding the imaging device.

Images