Image sensor for acquiring high-precision image

Abstract

The utility model discloses an image sensor for acquiring high-precision images, and belongs to the technical field of imaging systems. The utility model comprises a flexible photosensitive part, a silicon-based part, a bonding layer and a driving system, the flexible photosensitive part is embedded in the silicon-based part, the photosensitive surface of the flexible photosensitive part is flush with the surface of the silicon-based part, and the silicon-based part is bonded with the driving system through the bonding layer. According to the utility model, the driving system drives the flexible photosensitive part to deform to form a curved surface, the curvature of the curved surface is adjustable, and the curvature is utilized to correct the aberration of an imaging image and improve the quality of the imaging image, thereby obtaining a high-precision imaging image and reducing the complexity of subsequent image processing.

Description

Technical Field

[0001] The utility model belongs to the technical field of imaging systems and relates to an image sensor for acquiring high-precision images. Background Art

[0002] Image sensors are components that utilize the photoelectric conversion function of photoelectric devices to convert the light image on the photosensitive surface into an electrical signal that is proportional to the light image. They are widely used in digital cameras and other electronic optical imaging devices and are the core components of industrial cameras. Therefore, the imaging effect of image sensors directly affects the imaging effect of imaging devices.

[0003] Optical imaging devices such as digital cameras are mainly composed of lenses, image sensors, and digital signal processors. The lenses are used to collect light and focus it onto the image sensor. The image sensor converts the received light image into an electrical signal of a corresponding proportional relationship. The digital signal processor performs operations, filtering, analysis, and exchange on the electrical signal and outputs the electrical signal to subsequent devices. Then, when the lens collects light, the incident direction of the light is not uniform, which will form aberrations. After focusing, the object plane will become a curved surface. If the image sensor is flat or the degree of curvature is not appropriate, the light will not be able to reach the photosensitive surface of the image sensor after focusing, resulting in a situation where the image quality after imaging is low and very different from the actual object. The image aberration needs to be corrected through complex algorithms in the future, which increases the complexity of image processing.

[0004] Therefore, it is necessary to provide an image sensor for acquiring high-precision images, directly correct the aberration of the imaged image through the image sensor, improve the image quality, thereby acquiring high-precision images and reducing the complexity of subsequent image processing. Utility Model Content

[0005] In order to overcome the problems in the background technology, the utility model drives the silicon base to form a curved surface through a driving system, so that the flexible photosensitive part embedded in the silicon base also forms a curved surface, and drives the flexible photosensitive part through the driving system to adjust the curvature to a suitable state, and uses the curvature to correct the aberration to improve the imaging image quality and obtain high-precision images.

[0006] In order to achieve the above purpose, the utility model is implemented through the following technical solutions:

[0007] The image sensor includes a flexible photosensitive part 1, a silicon base 2, an adhesive layer 3, and a driving system. The flexible photosensitive part 1 is embedded in the silicon base 2, the photosensitive surface of the flexible photosensitive part 1 is flush with the surface of the silicon base 2, and the silicon base 2 is bonded to the driving system through the adhesive layer 3.

[0008] Preferably, the adhesive layer 3 is a wafer bonding film.

[0009] Preferably, the driving system comprises a driving base 4 and a hollow driving module 5, wherein one side of the hollow driving module 5 is a plane and the other side of the hollow driving module 5 is a toothed structure surface, and the driving base 4 is fixedly connected to the plane of the hollow driving module 5.

[0010] Preferably, the hollow space of the hollow driving module 5 is connected to the pneumatic valve through a hose.

[0011] Preferably, the driving base 4 and the hollow driving module 5 are integrally formed by 3D printing.

[0012] Beneficial effects of the utility model:

[0013] 1. The utility model drives the flexible photosensitive part to form a curved surface through a driving system, and makes the curvature of the flexible photosensitive part adjustable. The aberration of the imaging image is corrected by using the curvature of the image sensor, thereby improving the imaging image quality, obtaining an imaging image with higher precision, and reducing the complexity of subsequent image processing work.

[0014] 2. The utility model fills gas into the hollow space of the hollow driving module to deform the hollow driving module, thereby driving the driving base, the silicon base, and the flexible photosensitive part to deform, so that the flexible photosensitive part forms a curved surface. By controlling the amount of gas filled, the hollow driving module is deformed to different degrees, thereby adjusting the curvature of the flexible photosensitive part. In addition, the filling of gas does not affect the normal operation of the image sensor and other components.

[0015] 3. The utility model has a simple structure and is easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the working state of the utility model.

[0017] Figure 2 It is a schematic diagram of the working status of the comparative example.

[0018] Figure 3 It is a schematic diagram of the bending state of the utility model.

[0019] Figure 4 This is a schematic diagram of the separation structure of the silicon base and the drive system of the utility model.

[0020] Figure 5 This is a schematic diagram of Example 2 of the utility model.

[0021] In the figure, 1-flexible photosensitive part, 2-silicon base, 3-adhesive layer, 4-driving base, 5-hollow driving module, 6-imaging system, 7-chessboard, 8-computer. DETAILED DESCRIPTION

[0022] The present invention will be further described in detail below in conjunction with specific embodiments.

[0023] Example 1

[0024] like Figure 1 , 3 As shown in , 4, the image sensor includes a flexible photosensitive part 1, a silicon base 2, an adhesive layer 3, and a driving system. The flexible photosensitive part 1 is embedded in the silicon base 2, the photosensitive surface of the flexible photosensitive part 1 is flush with the surface of the silicon base 2, and the silicon base 2 is bonded to the driving system through the adhesive layer 3.

[0025] The adhesive layer 3 is a wafer attaching film (DAF).

[0026] The driving system includes a driving base 4 and a hollow driving module 5 . One side of the hollow driving module 5 is a plane, and the other side of the hollow driving module 5 is a toothed structure surface. The driving base 4 is fixedly connected to the plane of the hollow driving module 5 .

[0027] The hollow space of the hollow driving module 5 is communicated with the pneumatic valve through a hose.

[0028] The driving base 4 and the hollow driving module 5 are integrally formed by 3D printing.

[0029] When the driving system is required to drive the silicon base 2 and the flexible photosensitive part 1 to bend and deform, the pneumatic valve is opened, and the gas is filled into the hollow space of the hollow driving module 4 through the hose, so that the hollow driving module 5 is deformed, thereby driving the flexible photosensitive part 1 to bend. Figure 1 As shown, L1 is incident light parallel to the main optical axis, and L2 is incident light with an angle difference with the main optical axis. Both L1 and L2 can be focused on the photosensitive surface of the flexible photosensitive portion 1, thereby avoiding aberration caused by focusing position deviation and obtaining a high-precision imaging image. Figure 3 As shown, in the present invention, the sum of the curvature radius a of the receiving surface of the flexible photosensitive portion 1, the thickness c1 of the silicon base 2, and the thickness c2 of the adhesive layer is substantially equal to the curvature radius b of the concave surface of the driving base 4, b=a+c1+c2.

[0030] Comparative Example

[0031] The structure of this comparative example is Figure 2 As shown, the photosensitive surface of the photosensitive portion is flat, wherein the incident light L2 having an angle difference with the main optical axis is not focused on the photosensitive surface, thereby causing aberrations in the image and low image quality.

[0032] Example 2

[0033] like Figure 5As shown, the image sensor is installed in the imaging system 6, and the curvature of the image sensor is calibrated through the checkerboard image quality marking system, so that the curvature is in the best state. The calibration process is: the checkerboard 7 is placed in front of the imaging system 6 lens at a distance s, and the imaging system 6 is connected to the computer 8 to establish a communication connection. After the imaging system 6 and the computer 8 are turned on, the computer 8 receives the image signal transmitted by the imaging system 6 in real time and displays it. At this time, the amount of gas filled into the hollow space of the hollow driving module 5 is controlled by adjusting the pneumatic valve to increase or decrease the air pressure. At the same time, the imaging image effect is observed in real time through the computer 8. When the image effect displayed by the computer 8 is clear and has no shape distortion, it means that the curvature of the flexible photosensitive part 1 is in a good state at this time. The pneumatic valve is closed to keep the curvature of the flexible photosensitive part 1. In the subsequent shooting process, the curvature of the flexible photosensitive part 1 is fine-tuned according to the distance between the object to be photographed and the imaging system 6, so that the captured image has a higher quality, thereby obtaining an imaging image with higher precision. When the distance s between the chessboard 7 and the lens of the imaging system 6 is changed, the curvature of the flexible photosensitive portion 1 also needs to be adjusted accordingly to achieve a better state. Therefore, during the chessboard image quality marking process, the distance between the chessboard 7 and the lens of the imaging system 6 can be changed to make s take different values, and the corresponding curvature of the flexible photosensitive portion 1 when s takes different values ​​is determined. The s value and the curvature of the flexible photosensitive portion 1 are recorded to form a comparison table. When actually shooting the object to be photographed, it is only necessary to directly adjust the flexible photosensitive portion 1 to a suitable curvature according to the comparison table based on the distance between the object and the lens of the imaging system, and then further improve the imaging image quality through fine-tuning, thereby saving actual shooting time and improving efficiency.

[0034] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the utility model.

Claims

1. An image sensor for acquiring high-precision images, characterized in that: The image sensor comprises a flexible photosensitive portion (1), a silicon base (2), an adhesive layer (3), and a driving system; the flexible photosensitive portion (1) is embedded in the silicon base (2); the photosensitive surface of the flexible photosensitive portion (1) is flush with the surface of the silicon base (2); and the silicon base (2) is bonded to the driving system via the adhesive layer (3).

2. The image sensor for acquiring high-precision images according to claim 1, characterized in that: The adhesive layer (3) is a wafer bonding film.

3. An image sensor for acquiring high-precision images according to claim 1 or 2, characterized in that: The driving system comprises a driving base (4) and a hollow driving module (5); one side of the hollow driving module (5) is a plane, and the other side of the hollow driving module (5) is a toothed structure surface; the driving base (4) is fixedly connected to the plane of the hollow driving module (5).

4. The image sensor for acquiring high-precision images according to claim 3, characterized in that: The hollow space of the hollow driving module (5) is connected to the pneumatic valve via a hose.

5. The image sensor for acquiring high-precision images according to claim 3, characterized in that: The driving base (4) and the hollow driving module (5) are integrally formed by 3D printing.

Images