On-vehicle camera

Abstract

The utility model discloses an automobile camera, include: casing, one side shell wall is equipped with mounting hole, lens, is arranged in the mounting hole, circuit board, is assembled in the casing and one side board surface is equipped with the photosensitive chip of the focal point position of lens, temperature sensor is used for detecting and exports the actual working temperature of automobile camera, voltage regulation circuit, sets up on the circuit board, and voltage regulation circuit is connected with temperature sensor to calculate the corresponding compensation voltage according to the temperature difference of actual working temperature and preset working temperature, and piezoelectric ceramic sheet, and lens and / or circuit board are installed and fixed on the casing by piezoelectric ceramic sheet, and piezoelectric ceramic sheet is connected with voltage regulation circuit to generate corresponding deformation according to compensation voltage and drive lens and / or circuit board to carry out compensation displacement in the optical axis direction of lens. This embodiment is simple to manufacture and assemble and can effectively realize temperature drift compensation.

Description

Technical Field

[0001] This utility model relates to the field of vehicle-mounted camera equipment technology, and in particular to a vehicle-mounted camera. Background Technology

[0002] The focal length of vehicle cameras is usually designed to be fixed. However, during use, due to changes in ambient temperature, the various components of the vehicle camera (especially the optical components and their adjacent components) are prone to size changes due to thermal expansion and contraction. This causes changes in the lens focal length (often called temperature drift), resulting in unclear imaging and affecting the quality of the captured images.

[0003] To address temperature drift, vehicle cameras employ focal length compensation measures. There are two main existing focal length compensation methods: the first is to use internal lens elements for optical inversion compensation; the second is to install a drive motor inside the camera to achieve mechanical focal length adjustment. However, the first method requires high precision in manufacturing and assembly, making production difficult, and the optical inversion compensation amount is usually a fixed value, which cannot be flexibly adjusted according to changes in ambient temperature. The second method significantly increases the size of the camera and is relatively complex to install. Utility Model Content

[0004] The technical problem to be solved by this utility model embodiment is to provide a vehicle-mounted camera that is simple to manufacture and assemble and can effectively achieve temperature drift compensation.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a vehicle-mounted camera, comprising: The housing has a mounting hole on one side of its wall. The lens is inserted into the mounting hole; A circuit board is assembled inside the housing, and a photosensitive chip located at the focal position of the lens is provided on one side of the board. Temperature sensor is used to detect and output the actual operating temperature of the vehicle camera; A voltage regulation circuit, disposed on the circuit board, is connected to the temperature sensor to calculate and output a corresponding compensation voltage based on the temperature difference between the actual operating temperature and the preset operating temperature; and A piezoelectric ceramic sheet is used to mount and fix the lens and / or the circuit board to the housing. The piezoelectric ceramic sheet is connected to the voltage regulation circuit to generate corresponding deformation according to the compensation voltage, thereby driving the lens and / or the circuit board to perform compensating displacement in the optical axis direction of the lens.

[0006] Furthermore, a flange ring is formed by a radial protrusion in the middle section of the lens. The flange ring is disposed on the periphery of the outer opening of the mounting hole by means of the piezoelectric ceramic sheet. The piezoelectric ceramic sheet and the flange ring, as well as the piezoelectric ceramic sheet and the periphery of the outer opening of the mounting hole, are bonded and fixed by a first sealant.

[0007] Furthermore, the inner wall periphery of the housing is provided with an installation step, and the circuit board is disposed on the installation step by means of the piezoelectric ceramic sheet. The piezoelectric ceramic sheet and the installation step, as well as the piezoelectric ceramic sheet and one side surface of the circuit board, are bonded and fixed by a second sealant.

[0008] Furthermore, the installation steps are either in a closed ring shape or scattered and symmetrically distributed.

[0009] Furthermore, the piezoelectric ceramic sheet is flat and annular.

[0010] Furthermore, the piezoelectric ceramic sheet has leads for connecting to a voltage regulation circuit on the circuit board.

[0011] Furthermore, the temperature sensor is assembled on the circuit board or on the outer wall of the lens.

[0012] Furthermore, the housing includes a front shell and a rear cover that interlock to form an accommodating space. The front shell has mounting holes and openings on its opposite side walls. The rear cover is assembled at the opening of the front shell and covers the opening accordingly. The circuit board is inserted into the housing through the opening.

[0013] Furthermore, the front shell and the rear cover are sealed together by a sealing gasket placed between them; or, the front shell and the rear cover are sealed together by laser welding.

[0014] After adopting the above technical solution, the present utility model embodiment has at least the following beneficial effects: By adding a piezoelectric ceramic sheet between the lens and the housing and / or between the circuit board and the housing, when the ambient temperature of the vehicle camera changes, the temperature sensor promptly detects and outputs the actual working temperature of the vehicle camera. Then, the voltage regulation circuit on the circuit board calculates and outputs a corresponding compensation voltage based on the temperature difference between the actual working temperature and the preset working temperature. Power is supplied to the piezoelectric ceramic sheet according to the compensation voltage. Utilizing the inherent inverse piezoelectric effect of the piezoelectric ceramic, the piezoelectric ceramic sheet undergoes a corresponding deformation, causing at least one of the lens and the circuit board to undergo a compensating displacement in the optical axis direction of the lens. This ensures that the photosensitive chip on the circuit board is always located at the focal position of the lens, guaranteeing the imaging effect of the vehicle camera. Moreover, the overall structure is relatively simple and does not increase the size of the vehicle camera. Attached Figure Description

[0015] Figure 1 This is a cross-sectional structural diagram of an optional embodiment of the vehicle-mounted camera of this utility model.

[0016] Figure 2 This is a schematic diagram of the structure of a piezoelectric ceramic sheet in an optional embodiment of the vehicle-mounted camera of this utility model. Detailed Implementation

[0017] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the following illustrative embodiments and descriptions are only used to explain the present utility model and are not intended to limit the present utility model. Moreover, the embodiments and features in the embodiments of the present application can be combined with each other unless otherwise specified.

[0018] like Figure 1 As shown, an optional embodiment of this utility model provides a vehicle-mounted camera, including: The housing 1 has a mounting hole 10 on one side of its wall; Lens 2 is inserted into the mounting hole 10; Circuit board 3 is assembled inside the housing 1 and has a photosensitive chip 30 on one side of the board facing the mounting hole 10; Temperature sensor 5 is used to detect and output the actual operating temperature of the vehicle camera; A voltage regulation circuit 7 is mounted on the circuit board 3. The voltage regulation circuit 7 is connected to the temperature sensor 5 to calculate and output a corresponding compensation voltage based on the temperature difference between the actual operating temperature and the preset operating temperature. The piezoelectric ceramic sheet 9 is used to mount and fix the lens 2 and / or the circuit board 3 onto the housing 1. The piezoelectric ceramic sheet 9 is connected to the voltage regulation circuit 7 to generate corresponding deformation according to the compensation voltage, thereby driving the lens 2 and / or the circuit board 3 to perform compensation displacement in the optical axis direction of the lens 2.

[0019] This embodiment of the invention adds a piezoelectric ceramic sheet 9 between the lens 2 and the housing 1 and / or between the circuit board 3 and the housing 1. When the ambient temperature of the vehicle camera changes, the temperature sensor 5 promptly detects and outputs the actual operating temperature of the vehicle camera. Then, the voltage regulation circuit 7 on the circuit board 3 calculates and outputs a corresponding compensation voltage based on the temperature difference between the actual operating temperature and the preset operating temperature. Power is supplied to the piezoelectric ceramic sheet 9 according to the compensation voltage. Utilizing the inherent inverse piezoelectric effect of the piezoelectric ceramic, the piezoelectric ceramic sheet 9 undergoes a corresponding deformation, causing at least one of the lens 2 and the circuit board 3 to undergo a compensating displacement in the optical axis direction of the lens 2. This ensures that the photosensitive chip 30 on the circuit board 3 is always located at the focal position of the lens 2, guaranteeing the imaging effect of the vehicle camera. Moreover, the overall structure is relatively simple and does not increase the size of the vehicle camera.

[0020] In practical implementation, the voltage regulation circuit 7 usually has a table pre-stored showing the correspondence between the temperature difference between the actual operating temperature and the preset operating temperature and the compensation voltage. The compensation voltage can be obtained by looking up the table based on the temperature difference.

[0021] In one optional embodiment of this utility model, such as Figure 1 As shown, a flange ring 20 is formed by a radial protrusion in the middle section of the lens 2. The flange ring 20 is disposed around the outer periphery of the mounting hole 10 by means of the piezoelectric ceramic sheet 9. The piezoelectric ceramic sheet 9 and the flange ring 20, as well as the piezoelectric ceramic sheet 9 and the outer periphery of the mounting hole 10, are bonded and fixed by a first sealant 22. In this embodiment, the piezoelectric ceramic sheet 9 can be disposed around the outer periphery of the mounting hole 10. The axial displacement of the piezoelectric ceramic sheet 9 drives the lens 2 to move relative to the photosensitive chip 30, thereby achieving compensation. Furthermore, the first sealant 22 effectively achieves bonding, fixing, and sealing between the lens 2 and the mounting hole 10.

[0022] In one optional embodiment of this utility model, such as Figure 1 As shown, the inner periphery of the housing 1 is provided with a mounting step 11. The circuit board 3 is mounted on the mounting step 11 by means of the piezoelectric ceramic sheet 9. The piezoelectric ceramic sheet 9 and the mounting step 11, as well as the piezoelectric ceramic sheet 9 and one side surface of the circuit board 3, are bonded and fixed by a second sealant 110. In this embodiment, the piezoelectric ceramic sheet 9 can be provided at the mounting step 10 of the housing 1. The axial displacement of the piezoelectric ceramic sheet 9 can drive the circuit board 3 and the photosensitive chip 30 on it to move relative to the lens 2, thereby achieving compensation.

[0023] In one optional embodiment of this utility model, the mounting step 11 is in the form of a closed ring or in a scattered symmetrical distribution. In this embodiment, the mounting step 11 can be composed of a whole closed ring or a number of protrusions in a scattered symmetrical distribution, both of which can effectively support and position the piezoelectric ceramic sheet 9.

[0024] In specific implementation, both the first sealant 22 and the second sealant 110 can be common UV adhesives, epoxy resin AB adhesives, etc.

[0025] In one optional embodiment of this utility model, such as Figure 2 As shown, the piezoelectric ceramic sheet 9 is a flat ring. In this embodiment, the piezoelectric ceramic sheet 9 is a flat ring. When the piezoelectric ceramic sheet 9 is located at the periphery of the outer opening of the mounting hole 10, the flange ring 20 of the lens 2 is bonded to the piezoelectric ceramic sheet 9 with the help of the first sealant 22, which can ensure the sealing at the mounting hole 10; moreover, the flat ring-shaped piezoelectric ceramic sheet 9 can also be axially compensated along the thickness direction, so that the photosensitive chip 30 on the lens 2 or the circuit board 3 can move smoothly along the axial direction of the lens 2, thereby ensuring the accuracy of compensation.

[0026] In one optional embodiment of this utility model, such as Figure 1 and Figure 2 As shown, the piezoelectric ceramic sheet 9 has leads 90 for connecting to the voltage regulation circuit 7 on the circuit board 3. In this embodiment, the corresponding leads 90 on the piezoelectric ceramic sheet 9 facilitate electrical connection between the piezoelectric ceramic sheet 9 and the voltage regulation circuit 7 on the circuit board 3, making assembly convenient.

[0027] In one optional embodiment of this utility model, such as Figure 1 As shown, the temperature sensor 5 is assembled on the circuit board 3 or on the outer wall of the lens 2. In this embodiment, the temperature sensor 5 is also assembled on the circuit board 3, which facilitates circuit connection, and the temperature sensor 5 is located inside the vehicle camera, resulting in higher temperature detection accuracy; while being assembled on the outer wall of the lens 2 effectively detects the ambient temperature at the location of the lens 2.

[0028] In one optional embodiment of this utility model, such as Figure 1 As shown, the housing 1 includes a front shell 12 and a rear cover 14 that interlock to form an accommodating space. The front shell 12 has mounting holes 10 and openings 16 on its opposite side walls. The rear cover 14 is assembled to the opening 16 of the front shell 12 and covers the opening 16. The circuit board 3 is inserted into the housing 1 through the opening 16. In this embodiment, the housing 1 includes a front shell 12 and a rear cover 14. When the circuit board 3 is inserted into the front shell 12, the rear cover 14 can also cover the opening 16, thus protecting the internal structure.

[0029] In one optional embodiment of this utility model, such as Figure 1 As shown, the front shell 12 and the rear cover 14 are sealed together by a sealing gasket 18 placed between them; or, the front shell 12 and the rear cover 18 are sealed together by laser welding. In this embodiment, a sealed connection between the front shell 12 and the rear cover 14 can be achieved by setting a sealing gasket 18 or by direct laser welding, ensuring airtightness.

[0030] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the scope of protection of the present invention.

Claims

1. A vehicle-mounted camera, comprising: The housing has a mounting hole on one side of its wall. The lens is inserted into the mounting hole; A circuit board is assembled inside the housing, and a photosensitive chip located at the focal position of the lens is provided on one side of the board. as well as The vehicle-mounted camera is characterized in that it further includes: Temperature sensor is used to detect and output the actual operating temperature of the vehicle camera; A voltage regulation circuit, disposed on the circuit board, is connected to the temperature sensor to calculate and output a corresponding compensation voltage based on the temperature difference between the actual operating temperature and the preset operating temperature; and A piezoelectric ceramic sheet is used to mount and fix the lens and / or the circuit board to the housing. The piezoelectric ceramic sheet is connected to the voltage regulation circuit to generate corresponding deformation according to the compensation voltage, thereby driving the lens and / or the circuit board to perform compensating displacement in the optical axis direction of the lens.

2. The vehicle-mounted camera as described in claim 1, characterized in that, The middle section of the lens has a radially protruding flange ring. The flange ring is disposed on the periphery of the outer opening of the mounting hole by means of the piezoelectric ceramic sheet. The piezoelectric ceramic sheet and the flange ring, as well as the piezoelectric ceramic sheet and the periphery of the outer opening of the mounting hole, are bonded and fixed by a first sealant.

3. The vehicle-mounted camera as described in claim 1 or 2, characterized in that, The inner wall of the housing is provided with an installation step. The circuit board is mounted on the installation step by means of the piezoelectric ceramic sheet. The piezoelectric ceramic sheet and the installation step, as well as the piezoelectric ceramic sheet and one side of the circuit board, are bonded and fixed by a second sealant.

4. The vehicle-mounted camera as described in claim 3, characterized in that, The installation steps are either in a closed ring shape or scattered and symmetrically distributed.

5. The vehicle-mounted camera as described in claim 1 or 2, characterized in that, The piezoelectric ceramic sheet is a flat ring shape.

6. The vehicle-mounted camera as described in claim 1, characterized in that, Leads for connecting to a voltage regulation circuit on the circuit board are extended from the piezoelectric ceramic sheet.

7. The vehicle-mounted camera as described in claim 1, characterized in that, The temperature sensor is assembled on the circuit board or on the outer wall of the lens.

8. The vehicle-mounted camera as described in claim 1, characterized in that, The housing includes a front shell and a rear cover that interlock to form a receiving space. The front shell has mounting holes and openings on its opposite side walls. The rear cover is assembled at the opening of the front shell and covers the opening. The circuit board is inserted into the housing through the opening.

9. The vehicle-mounted camera as described in claim 8, characterized in that, The front shell and the rear cover are sealed together by a sealing gasket placed between them; or, the front shell and the rear cover are sealed together by laser welding.

Images