WO2023145129A1

WO2023145129A1 - Imaging device

Info

Publication number: WO2023145129A1
Application number: PCT/JP2022/034832
Authority: WO
Inventors: 康孝松本; 雅之秋枝; 敬一宇治田; 秀之井口; 正実福原; 誠宮本
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2022-01-26
Filing date: 2022-09-16
Publication date: 2023-08-03
Also published as: JP2023108914A

Abstract

An imaging device according to the present disclosure comprises a substrate, a housing, and a first fixing member. An imaging element is mounted on the substrate. The housing comprises a first housing and a second housing, and houses the substrate in a space defined by the first housing and the second housing. The first fixing member penetrates through the first housing or the second housing and fixes one housing to the other housing. The first fixing member is made of a different metal than the housings. A peripheral surface of the first fixing member is provided with a surface treatment for preventing corrosion of an abutting surface of the housing through which the first fixing member penetrates.

Description

Imaging device

The present invention relates to imaging devices.

In recent years, with the spread of vehicle driving support systems, the number of vehicles equipped with cameras (hereinafter also referred to as imaging devices) is increasing. Such an imaging device includes a lens unit to which a lens is attached, and a housing that houses an image sensor (hereinafter also referred to as a sensor) and the like. In addition, the casing is also made of a conductive material such as metal as a heat countermeasure to prevent electromagnetic noise from entering and leaking and to suppress the temperature rise inside the camera.

By the way, the imaging device described above is used in various environments such as being exposed to vehicle vibrations and being installed outside the vehicle. Images can be obtained over time. For example, conventionally, fixing members such as screws are used to fix the positional relationship between the lens and the sensor (for example, Patent Document 1).

U.S. Pat. No. 8,542,451

However, for example, in the technique of fixing using the fixing member described above, if the housing and the fixing member are formed of dissimilar metals, corrosion due to electric corrosion may occur, and the waterproof performance of the imaging device may deteriorate. be. If the waterproof function of an imaging device deteriorates, there is a risk that electrical parts housed in the imaging device will short-circuit due to water intrusion, rendering the imaging device inoperable. It is

The present disclosure provides an imaging device capable of preventing deterioration of waterproof performance due to corrosion.

An imaging device according to the present disclosure includes a substrate, a housing, and a first fixing member. An imaging device is mounted on the substrate. The housing has a first housing and a second housing, and accommodates the substrate in a space formed by the first housing and the second housing. The first fixing member penetrates through the first housing or the second housing and fixes one housing to the other housing. The outer peripheral surface of the fixing member is subjected to surface treatment for preventing corrosion of the contact surface of the housing through which the first fixing member penetrates.

The imaging device according to the present disclosure can prevent deterioration of waterproof performance due to corrosion.

FIG. 1 is a schematic diagram showing an example of an imaging device according to an embodiment. FIG. 2 is an exploded view showing an example of the imaging device according to the embodiment. FIG. 3 is a schematic diagram illustrating an example of a housing according to the embodiment; FIG. 4 is a cross-sectional view showing an example of the imaging device according to the embodiment. FIG. 5 is a schematic diagram showing an example of a substrate according to the embodiment. FIG. 6 is a cross-sectional view showing an example of the imaging device according to the embodiment. FIG. 7 is a cross-sectional view showing an example of an imaging device according to Modification 2. As shown in FIG. FIG. 8 is a cross-sectional view showing an example of an imaging device according to modification 5. As shown in FIG. FIG. 9 is a cross-sectional view showing an example of an imaging device according to modification 5. As shown in FIG.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. However, more detailed description than necessary may be omitted. It should be noted that the accompanying drawings and the following description are provided for a thorough understanding of the present disclosure by those skilled in the art and are not intended to limit the claimed subject matter.

The imaging device according to this embodiment is, for example, an in-vehicle camera that is mounted on a vehicle and that can be used for driving assistance of the vehicle. The imaging device for driving support detects objects such as vehicles, pedestrians, and obstacles by image processing by the internal ISP (Image Signal Processor), warns the driver, and forces the vehicle to stop. It plays a major role in the driving support system of the vehicle.

An example of the configuration of the imaging device according to the present embodiment will be described using FIGS. 1, 2, 3, 4, 5 and 6. In the drawings described below, the X-axis, Y-axis, and Z-axis that are orthogonal to each other are shown for convenience, and the left-right direction (X-direction), the front-rear direction (Y-direction), and the up-down direction of the imaging device 100 of the present embodiment are shown. The direction (Z direction) will be explained using the X axis, Y axis, and Z axis. In the following description, simply describing the X direction, the Y direction, or the Z direction means each axial direction and includes two opposite directions.

When the positive direction of the X-axis is specified, it is one direction from left to right; when the positive direction of the Y-axis is specified, it is one direction from front to back; If specified as a positive direction, it is one direction from bottom to top. When specified as the negative direction of the X-axis, it is one direction from right to left; when specified as the negative direction of the Y-axis, it is one direction from the rear to the front; When the direction is specified, it is one direction from the upper side to the lower side.

FIG. 1 is a schematic diagram of an imaging device according to an embodiment. FIG. 2 is an exploded view of the imaging device according to the embodiment. FIG. 3 is a schematic diagram of the first housing according to the embodiment viewed from the positive direction of the Z-axis. FIG. 4 is a cross-sectional view of the imaging device according to the embodiment. FIG. 5 is a schematic diagram of the substrate according to the embodiment viewed from the positive direction of the Z-axis. FIG. 6 is an enlarged view enlarging a part of the cross section of the imaging device according to the embodiment.

The imaging device 100 according to this embodiment includes a lens unit 1, a first housing 2, a second housing 3, a substrate 4, a mounting substrate connector 5, a waterproof member 6, a first fixing member 7 and a second fixing member 8. Prepare. Note that the configuration of the imaging device 100 is not limited to this.

The lens unit 1 has a barrel and a lens (both not shown). A lens barrel is a cylindrical member that is open at both ends. Inside the lens barrel, lenses are arranged at predetermined positions. The lens barrel can be formed using, for example, a resin material. The lens is made of plastic, glass, or the like. The lens is arranged along the optical axis inside the lens barrel, and forms an image of light from a subject on an imaging device mounted on a substrate 4, which will be described later. Note that the number of lenses may be one or plural.

The first housing 2 is an example of a housing. The first housing 2 has a concave shape with a hollow inside. The first housing 2 accommodates part of the lens unit 1 and a substrate 4 described later in a space formed by combining with a second housing 3 described later. A lens unit 1 is attached to the first housing 2 . A hole 21 corresponding to the outer shape (outer diameter) of the lens unit 1 is formed in the surface of the first housing 2 to which the lens unit 1 is attached. The lens unit 1 is attached to the first housing 2 by fitting one end of the lens unit 1 into the hole 21 of the first housing 2 .

The first housing 2 is made of metal such as aluminum die-cast (as an example, an aluminum alloy such as the ADC 12). Further, the surface of the first housing 2 is generally subjected to surface treatment (alumite, electrodeposition coating, plating, etc.) with a predetermined film thickness (several microns to several tens of microns) as an antirust treatment. Note that the first housing 2 is also called a front case.

The first housing 2 has a first hole 22 at a portion that contacts the second housing 3, which will be described later. The first hole 22 is an example of a hole. The first hole 22 is a hole provided in the first housing 2 in the Z-axis direction, and is used when combining the first housing 2 and the second housing 3 . Specifically, the first fixing member 7 described later is inserted into the first hole 22 . A chamfered portion 26 is formed at the opening of the first hole 22 to serve as a guide for inserting the first fixing member 7 . The first housing 2 and the second housing 3 are fixed by the first fixing member 7 inserted into the first hole 22 .

For example, a plurality of first holes 22 are provided on the outer edge of the second housing 3 . FIG. 2 shows an example in which two first holes 22 are provided outside the first housing 2 . The first holes 22 are preferably provided at diagonal positions on the outer edge of the first housing 2 .

The first housing 2 has a first projecting portion 23, a second hole 24, a second projecting portion 25, etc. inside. The first projecting portion 23 is an example of a projecting portion. The first projecting portion 23 is used to position the substrate 4, which will be described later, within the housing. Specifically, the first projecting portion 23 is a portion projecting in the positive direction of the Z-axis direction. The first projecting portion 23 is inserted into a fourth hole 41 provided in the substrate 4 when the substrate 4 to be described later is attached to the first housing 2 .

A plurality of first protrusions 23 are provided inside the first housing 2 . FIG. 3 shows an example in which two first protrusions 23 are provided inside the first housing 2 . In addition, it is preferable that the first protrusions 23 are provided at diagonal positions inside the first housing 2 . By providing a plurality of first protrusions 23, the orientation of the substrate 4 attached to the first protrusions 23, specifically, the Z-axis (vertical) direction and the XY-axis (horizontal) direction can be appropriately arranged. Further, by providing a plurality of first protrusions 23, it is possible to suppress the rotation of the substrate 4 around the .theta.-axis, so that the substrate 4 can be fixed in an appropriate direction.

As a result, the element surface (sensor surface) of the imaging element provided on the substrate 4 can be attached to the first housing 2 with the element surface (sensor surface) arranged perpendicular to the XY axes, that is, parallel to the Z axis. In addition, the element surface (sensor surface) of the imaging element provided on the substrate 4 can be attached to the first housing 2 in a state in which the position in the XY axis direction is arranged at an appropriate position.

The second hole 24 is an example of a hole. The second hole 24 is a part for fixing the substrate 4 which will be described later. Specifically, the second hole 24 is a hole provided in the Z-axis direction of the first housing 2 . A second fixing member 8 to be described later is inserted into the second hole 24 . The second hole 24 corresponds to a fifth hole 42 provided in the substrate 4, which will be described later. The first housing 2 and the substrate 4 are fixed by the second fixing member 8 inserted into the second hole 24 and the fifth hole 42 .

A plurality of second holes 24 are provided inside the first housing 2 . FIG. 3 shows an example in which two second holes 24 are provided inside the first housing 2 . Moreover, it is preferable that the second holes 24 are provided at diagonal positions inside the first housing 2 . By providing a plurality of second holes 24, the direction of the second fixing member 8 attached to the second holes 24, specifically, the Z-axis (vertical) direction and the XY-axis (horizontal) direction can be appropriately arranged. can.

The second projecting portion 25 is an example of a projecting portion. The second protruding portion 25 is a part for positioning the layout position of the substrate 4 to be described later inside the first housing 2 . Specifically, the second projecting portion 25 is a portion projecting in the positive direction of the Z-axis direction. The second protrusion 25 is fitted into a recess 43 provided on the substrate 4, which will be described later.

The second protrusion 25 is provided inside the first housing 2 . FIG. 3 shows an example in which one second projecting portion 25 is provided inside the first housing 2 . By fitting the second protrusion 25 into the recess 43 of the substrate 4, the direction of the substrate 4, specifically, the Z-axis (vertical) direction and the XY-axis (horizontal) direction can be arranged in an appropriate direction. can. A plurality of second projecting portions 25 may be provided inside the first housing 2 .

The second housing 3 is an example of a housing. The second housing 3 has a concave shape with a hollow inside. The second housing 3 accommodates a part of the lens unit 1 and a substrate 4 described later in a space formed by combining with the first housing 2 . The second housing 3 is made of, for example, aluminum die-cast (eg, an aluminum alloy such as the ADC 12), resin, or the like. The second housing 3 is also called a rear case. In addition, the first housing 2 and the second housing 3 are collectively referred to as a housing.

The second housing 3 has an output mechanism 31 inside. The output mechanism 31 has a conductive connection portion 32 for connecting an electric cable for outputting an image signal, which is a signal output from the imaging element, to the outside. The output mechanism 31 is, for example, a coaxial (2-wire type) connector, an STQ (shielded twisted quad wire) (4-wire type) connector, a CAN-incorporated STQ (6-wire type) connector, or the like. The connecting portion 32 is electrically connected to the mounting board connector 5 by fitting with the mounting board connector 5 described later. Fitting between the connection portion 32 and the mounting board connector 5 will be described later.

The second housing 3 has a third hole 33 at a portion that contacts the first housing 2 . The third hole 33 is an example of a hole. The third hole 33 is a hole for combining the first housing 2 and the second housing 3 and is provided at a position corresponding to the first hole 22 . Specifically, the third hole 33 is a hole penetrating the second housing 3 in the Z-axis direction. The first fixing member 7 described later is inserted into the third hole 33 . The first housing 2 and the second housing 3 are fixed by the first fixing member 7 inserted into the third hole 33 .

A plurality of third holes 33 are provided outside the second housing 3 . FIG. 2 shows an example in which two third holes 33 are provided according to the number of first holes 22 .

On one side of the substrate 4, an imaging device is mounted that converts the light received through the lens into an image signal. Further, the substrate 4 has a mounting substrate connector 5 including a connection terminal with an imaging element mounted on one surface side. The substrate 4 is housed inside the space formed by the first housing 2 and the second housing 3 .

The substrate 4 also has a fourth hole 41 , a fifth hole 42 and a recess 43 . The fourth hole 41 is an example of a hole. The fourth hole 41 has a diameter corresponding to the first protrusion 23 at a portion corresponding to the first protrusion 23 when properly arranged in the housing. The substrate 4 is attached to the first housing 2 with the first projecting portion 23 inserted into the fourth hole 41 . Specifically, the fourth hole 41 is a hole penetrating through the substrate 4 in the Z-axis direction. The first projecting portion 23 is inserted into the fourth hole 41 . The first housing 2 and the substrate 4 are fixed by the first projecting portion 23 inserted into the fourth hole 41 . The fourth hole 41 corresponds to the first projecting portion 23 when the substrate 4 is properly attached to the first housing 2 .

A plurality of fourth holes 41 are provided in the substrate 4 . FIG. 5 shows an example in which two fourth holes 41 are provided in the substrate 4 . Moreover, it is preferable that the fourth hole 41 is provided at a diagonal position on the substrate 4 . By providing a plurality of fourth holes 41, the substrate 4 attached to the first protruding portion 23 can be properly arranged in the Z-axis (vertical) direction and the XY-axis (horizontal) direction. Further, by providing a plurality of fourth holes 41, rotation of the substrate 4 around the Z axis can be suppressed, and the substrate 4 can be fixed in an appropriate direction.

The fifth hole 42 is an example of a hole. The fifth hole 42 is a hole for fixing the substrate 4 to the first housing 2 . Specifically, the fifth hole 42 is a hole penetrating the substrate 4 in the Z-axis direction. A second fixing member 8 to be described later is inserted into the fifth hole 42 . The first housing 2 and the substrate 4 are fixed by the second fixing member 8 inserted into the fifth hole 42 .

One or more fifth holes 42 are provided in the substrate 4 . FIG. 5 shows an example in which two fifth holes 42 are provided in the substrate 4 . Also, the fifth holes 42 are preferably provided at diagonal positions on the substrate 4 . By providing a plurality of fifth holes 42, the direction of the substrate 4 attached to the second fixing member 8 described later, specifically, the Z-axis (vertical) direction and the XY-axis (horizontal) direction can be appropriately arranged. can. Further, by providing a plurality of fifth holes 42, the rotation of the substrate 4 around the Z-axis can be suppressed, and the substrate 4 can be fixed in an appropriate direction.

The recessed portion 43 is provided at a portion corresponding to the second projecting portion 25 when the substrate 4 is properly arranged in the housing. The recessed portion 43 is an example of a notch portion, and has a notch shape corresponding to the second projecting portion 25 . Specifically, the recess 43 is a notch provided at the corner of the substrate 4 . The substrate 4 is attached to the first housing 2 with the second protrusion 25 fitted in the recess 43 .

Although FIG. 5 shows an example in which one recess 43 is provided in the substrate 4, a plurality of recesses 43 may be provided. Moreover, it is preferable to provide the concave portions 43 at diagonal positions on the substrate 4 . By providing the concave portion 43, the direction of the substrate 4 that contacts the second projecting portion 25, specifically, the Z-axis (vertical) direction and the XY-axis (horizontal) direction can be appropriately arranged. Further, by providing the concave portion 43, the rotation of the substrate 4 around the Z-axis can be suppressed, and the substrate 4 can be fixed in an appropriate direction.

The mounting board connector 5 is a connection section 32 for outputting an image signal, which is a signal output from the imaging device, to the output mechanism 31 . The mounting board connector 5 is provided on the imaging device mounted on the board 4 and is fitted with the connecting portion 32 .

Here, the fitting between the mounting board connector 5 and the connecting portion 32 will be described. First, the board 4 is fixed by the second fixing member 8 before the mounting board connector 5 and the connection portion 32 are fitted together. After the substrate 4 is fixed, the mounting substrate connector 5 and the connection portion 32 are fitted together. Here, for example, when the connecting portion 32 is fitted to the mounting board connector 5, if there is a positional deviation between the mating surface of the connecting portion 32 and the mating surface of the mounting board connector 5, the substrate 4 may be displaced. is fixed to the first housing 2 in advance, the mounting board connector 5 and the connecting portion 32 may not be properly fitted.

Therefore, in this embodiment, as shown in FIG. 6, the inner diameter L2 of the mating surface of the connecting portion 32 is formed larger than the outer diameter L1 of the mating surface of the mounting board connector 5 . For example, the inner diameter L2 is 0.5 mm larger than the outer diameter L1. As a result, the mounting board connector 5 and the connection portion 32 can be easily and properly fitted.

The waterproof member 6 is a sealing member for keeping the internal space of the housing airtight. The waterproof member 6 is provided between the first housing 2 and the second housing 3, is sandwiched between the first housing 2 and the second housing 3, and is pressed from the Z-axis direction. By pressing the waterproof member 6, the mating surfaces of the first housing 2 and the second housing 3 are sealed, and the imaging device 100 has a waterproof function. The waterproof member 6 is, for example, a waterproof packing using any elastic material such as rubber.

The first fixing member 7 is an example of a fixing member. The first fixing member 7 is a fixing member made of a metal different from that of the housing, which penetrates through the first housing 2 or the second housing 3 and fixes one housing to the other housing. The first fixing member 7 fixes the second housing 3 to the first housing 2 by fastening the second housing 3 to the first housing 2 in the negative direction of the Z-axis direction. The first fixing member 7 is, for example, a fixing screw made of a metal material (eg, stainless steel).

Also, the first fixing member 7 is provided with a surface treatment portion 71 . Specifically, the outer peripheral surface of the first fixing member 7 is subjected to surface treatment to prevent corrosion of the contact surface of the housing through which the first fixing member 7 penetrates. The surface treatment is, for example, ZECCOAT (registered trademark) such as a silica-based special compound, or rust prevention treatment such as iron-zinc-chromate treatment.

The second fixing member 8 is an example of a fixing member. The second fixing member 8 fixes the substrate 4 to the first housing 2 by fastening the substrate 4 to the first housing 2 in the negative direction of the Z-axis direction. The second fixing member 8 is, for example, a tapping screw made of a metal material (eg, stainless steel). By using the tapping screws, the first housing 2 and the substrate 4 can be more fixed, and the positional relationship between the lens and the imaging device mounted on the substrate 4 does not change, so the captured image can be kept clear. can do.

By the way, if the first housing 2 and the first fixing member 7 are made of dissimilar metals, a metal corrosion phenomenon may occur between dissimilar metals. The phenomenon of metal corrosion will be described below. In this event, it is assumed that the material of the first housing 2 is a first metallic material such as aluminum, and the first fixing member 7 is a second metallic material such as stainless steel that is different from the first metallic material.

In the above configuration, the first housing 2 and the first fixing member 7 are made of dissimilar metals. Therefore, when an electrically conductive liquid such as raindrops or salt water enters between the first housing 2 and the first fixing member 7 due to capillary action or the like, a potential difference is generated between the first housing 2 and the first fixing member 7 . occurs, and electrical corrosion occurs.

Specifically, the metal with a high ionization tendency (in the above example, the first housing 2 made of the first metal material) dissolves into the liquid, and the metal corrodes due to electric corrosion. As the corrosion progresses, the surface treatment of the first housing 2 deteriorates (for example, the paint film floats), the airtightness of the housing cannot be maintained, and the waterproof performance of the imaging device is hindered.

Therefore, in this embodiment, the surface of the first fixing member 7 is coated with a surface treatment agent. A surface treatment agent is a material that suppresses the potential difference between different metals with respect to the surface with which different metals are in contact. By applying a surface treatment agent to the surface of the first fixing member 7, a surface treatment portion 71 that covers the outer peripheral surface of the first fixing member 7 is formed. Since the surface-treated portion 71 is formed on the first fixing member 7 , even if it contacts the first housing 2 , no potential difference occurs and corrosion does not occur. can remain properly fixed.

As described above, the imaging device 100 of the present embodiment fastens the housing, and the first fixing member is subjected to surface treatment for preventing corrosion of the contact surface of the housing through which the first fixing member 7 penetrates. A member 7 is provided. Accordingly, in the imaging apparatus 100 of the present embodiment, the surface of the outer peripheral surface of the first fixing member 7 is subjected to surface treatment, so that no potential difference occurs on the outer peripheral surface of the first fixing member 7 that contacts the housing, and corrosion is prevented. Therefore, deterioration of waterproof performance due to corrosion can be prevented.

It should be noted that the above-described embodiment can be appropriately modified and implemented by changing a part of the configuration or function of each device described above. Therefore, hereinafter, some modifications of the above-described embodiment will be described as other embodiments. In the following description, points different from the above-described embodiment will be mainly described, and detailed description of points common to the contents already described will be omitted.

In the above-described embodiment, the first housing 2 and the first fixing member 7 are made of different metals, and the first housing 2 is the member to be fastened. In Modified Example 1, a configuration in which the second housing 3 and the first fixing member 7 are made of dissimilar metals and the second housing 3 is a member to be fastened will be described.

(Modification 1)
For example, if the second housing 3 and the first fixing member 7 are made of dissimilar metals, metal corrosion may occur between dissimilar metals. The phenomenon of metal corrosion will be described below. In this event, it is assumed that the material of the second housing 3 is a first metallic material such as aluminum, and the first fixing member 7 is a second metallic material such as stainless steel that is different from the first metallic material.

In the above configuration, the second housing 3 and the first fixing member 7 are made of dissimilar metals. Therefore, when an electrically conductive liquid such as raindrops or salt water enters between the second housing 3 and the first fixing member 7 due to capillary action or the like, the potential difference between the first housing 2 and the first fixing member 7 is increased. occurs and corrosion occurs.

Specifically, the metal with a high ionization tendency (the second housing 3 made of the first metal material in Modification 1) dissolves into the liquid, causing corrosion. As the corrosion progresses, the surface treatment of the second housing 3 deteriorates (for example, the paint film floats), the airtightness of the housing cannot be maintained, and the waterproof performance of the imaging device is hindered.

However, since the surface-treated portion 71 is formed on the first fixing member 7, even if it comes into contact with the second housing 3, no potential difference occurs and corrosion does not occur. be able to.

In the modified examples described below, a configuration that can achieve an appropriate positional relationship between the lens and the sensor will be mainly described when assembling the first housing 2 and the second housing 3 . Further, the modifications described below may be implemented individually or in combination as appropriate.

(Modification 2)
Although the number of substrates 4 is one in the above-described embodiment, the number of substrates 4 is not limited to this. Therefore, in Modified Example 2, a configuration of the substrate 410 in which the number of the substrates 4 is two will be described with reference to FIG. FIG. 7 is a cross-sectional view showing an example of an imaging device 200 according to Modification 2. As shown in FIG.

For example, the substrate 410 has a first substrate 411 , a second substrate 412 and flexible wiring 413 . The first substrate 411 mounts an imaging device that captures an object image formed on an imaging surface by a lens. The first substrate 411 is the substrate 410 fixed to the first housing 2 via the second fixing member 8 . Also, the first substrate 411 has a sixth hole 4111 . The sixth hole 4111 is an example of a hole. The sixth hole 4111 extends in the Z-axis direction and penetrates the first substrate 411 . The first protrusion 23 is inserted into the fourth hole 41 .

The second board 412 is a board 410 that has a mounting board connector 5 for fitting the output mechanism 31 and is electrically connected to the first board 411 via flexible wiring 413 . The flexible wiring 413 is wiring that electrically connects the first substrate 411 and the second substrate 412 .

Since the substrate 410 has flexible wiring 413 , the mounting substrate connector 5 provided on the second substrate 412 has a degree of freedom with respect to the connecting portion 32 , so that it can be properly fitted with the connecting portion 32 . Thereby, the assembly of the first housing 2 and the second housing 3 can be efficiently performed.

(Modification 3)
For example, the outer diameter of the contact surface of the first housing 2 and the outer diameter of the contact surface of the second housing 3 may be equal. By equalizing the outer diameter of the contact surface of the first housing 2 and the outer diameter of the contact surface of the second housing 3, when assembling the first housing 2 and the second housing 3, the first housing 2 and the side of the second housing 3 can be aligned to provide a reference surface for assembly. Thereby, the assembly of the first housing 2 and the second housing 3 can be efficiently performed.

(Modification 4)
In the second modification described above, the outer diameter of the contact surface of the first housing 2 and the outer diameter of the contact surface of the second housing 3 are equal, but the outer diameter of the contact surface is limited to this. not to be Therefore, in Modified Example 3, a form in which the outer diameter of the contact surface of the first housing 2 and the outer diameter of the contact surface of the second housing 3 are different will be described.

For example, the outer diameter of the second housing 3 may be larger than the outer diameter of the first housing 2. That is, the second housing 3 may cover the first housing 2 that contacts the second housing 3 . By making the outer diameter of the second housing 3 larger than the outer diameter of the first housing 2 , the connection part 32 provided in the second housing 3 is connected to the substrate 4 fixed to the first housing 2 . Since it can move freely with respect to the mounting board connector 5 , it can be properly fitted with the mounting board connector 5 .

(Modification 5)
In Modified Example 5, the fact that the film thickness formed by the surface treatment can be left by changing the processing process of the chamfered portion 26 will be described with reference to FIGS. 8 and 9. FIG. 8 and 9 are cross-sectional views showing an example of the first housing 2 according to Modification 5. FIG.

For example, the first hole 22 to which the first fixing member 7 is fastened is generally machined after surface treatment because a predetermined dimensional accuracy is required. Also, the chamfered portion 26 is machined at the same timing as the first hole 22 is machined. However, since the chamfered portion 26 has a shape that is susceptible to the accumulation of salt water or the like when it enters from the outside, when the film formed by the surface treatment is removed, the aluminum die-cast metal base is exposed and is resistant to corrosion. Endurance will decrease.

Therefore, in modification 5, as shown in FIG. 8, the first housing 2 is first formed with the chamfered portion 26 during molding. After forming the chamfered portion 26, the first housing 2 is subjected to surface treatment. After the surface treatment, the first housing 2 is processed to form the first holes 22 as shown in FIG.

As a result, the film thickness of the chamfered portion 26 remains after the surface treatment. In other words, it is possible to avoid exposing the aluminum die-cast metal base of the first housing 2 and improve resistance to corrosion. In Modification 5, the chamfered portion 26 is formed during molding, but the surface treatment may be performed after the chamfered portion 26 is machined. The chamfered portion may be formed in the third hole 33 provided in the second housing 3, and the formed chamfered portion may be subjected to surface treatment.

It should be noted that the above-described embodiments are presented as examples and are not intended to limit the scope of the present disclosure. The above embodiment can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. The above-described embodiments are included in the scope or gist of the present disclosure, and are included in the invention described in the claims and their equivalents.

1 lens unit 2 first housing 3 second housing 4 board 5 mounting board connector 6 waterproof member 7 first fixing member 8 second fixing member 22 first hole 23 first protrusion 24 second hole 25 second protrusion 26 chamfered portion 31 output mechanism 32 connection portion 33 third hole 41 fourth hole 42 fifth hole 43 concave portion 410

substrate

100, 200 imaging device

Claims

a substrate on which an imaging device is mounted;
a housing having a first housing and a second housing, and housing the substrate in a space formed by the first housing and the second housing;
a first fixing member that penetrates through the first housing or the second housing and fixes one housing to the other housing and is formed of a metal different from that of the housing;
with
The outer peripheral surface of the first fixing member is subjected to surface treatment to prevent corrosion of the contact surface of the housing through which the first fixing member penetrates.
Imaging device.
a chamfered portion formed in at least one of the openings of the holes of the first housing and the second housing into which the first fixing member is inserted;
The chamfered portion is subjected to the surface treatment having a predetermined film thickness,
The imaging device according to claim 1 .
The first housing has a first protrusion inside the first housing for positioning the substrate in the housing,
The substrate has a hole having a diameter corresponding to the first protrusion at a portion corresponding to the first protrusion when properly arranged in the housing, and the first protrusion is formed in the hole. attached to the first housing with the part inserted;
The imaging device according to claim 1 or 2.
The first housing has a second protrusion inside the first housing for positioning the substrate in the housing,
The substrate has a notch portion having a shape corresponding to the second projecting portion at a portion corresponding to the second projecting portion when properly arranged in the housing, and the second projecting portion is formed in the notch portion. attached to the first housing with the parts fitted together;
The imaging device according to claim 3.
The substrate is fixed to the first housing with a tapping screw,
The imaging device according to any one of claims 1 to 4.
The board has a mounting board connector for outputting an image signal output from the imaging element,
The second housing has a connecting portion for fitting to the mounting board connector and electrically connecting to the mounting board connector,
The inner diameter of the connecting portion is larger than the outer diameter of the mounting board connector,
The imaging device according to any one of claims 1 to 5.
The outer diameter of the second housing is larger than the outer diameter of the first housing,
the second housing moves relative to the mounting board connector;
The imaging device according to claim 6.