CN213342427U

CN213342427U - Active alignment system of camera module

Info

Publication number: CN213342427U
Application number: CN202021856972.8U
Authority: CN
Inventors: 肖文平; 程旭; 石川; 王立柱
Original assignee: Zhejiang Heqian Electronic Technology Co ltd
Current assignee: Zhejiang Heqian Electronic Technology Co ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2021-06-01
Anticipated expiration: 2030-08-31

Abstract

The utility model provides an initiative alignment system of camera module, include: the device comprises an industrial personal computer, a CMOS chip and an ISP chip which are arranged on a PCB, a lens barrel provided with a lens and a hardware switching device, wherein one end of the hardware switching device is connected with the CMOS chip and/or the ISP chip, and the other end of the hardware switching device is connected with the industrial personal computer; hardware switching device is equipped with CMOS chip, IPS chip assorted communication interface, and the industrial computer communicates and disposes the parameter of CMOS chip and ISP chip through hardware switching device and CMOS chip and ISP chip for the technical scheme that the camera module can in time adjust the parameter of CMOS chip and ISO chip when discovering the quality of imaging when not good in the initiative alignment, makes it accomplish the adaptation.

Description

Active alignment system of camera module

Technical Field

The utility model relates to a camera field especially relates to an initiative alignment system of camera module.

Background

With the rapid development of the internet of things and the automatic driving technology, the application of a terminal sensor, particularly an image sensor, is greatly exploded, and the requirements of an on-vehicle camera and a wide-angle camera on the application are sharply improved. Meanwhile, the application of the camera is not limited to the field that images displayed on a display screen are used for subjectively observing the environment and more images are applied to image processing, recognition and the like, and the requirement of higher precision is put forward on the definition and consistency of the camera. Active Alignment (AA) is called Active Alignment for short and comes up to the end under the requirement, the Active Alignment technology utilizes image information acquired by a camera to automatically align the focal length and the optical axis of the camera and a focal plane through a fine automatic assembly technology, the definition and the optical axis Alignment precision of the camera are greatly improved relatively to a manual assembly lens, the inclination degree of the focal plane is reduced, and therefore the image acquisition quality and the consistency of the camera are greatly improved. The active alignment logic typically runs on an industrial computer.

The existing active alignment technology is gradually developed, but due to the LENS, CMOS and ISP matching of different cameras, the difference of the image quality of the cameras is large, meanwhile, the difference of the active alignment environment is also large, the calculation precision of the active alignment is greatly influenced, the active alignment is carried out on the same module for many times, the difference of the final result of the active alignment is often caused due to the reasons, the imaging is obviously zoomed, the image is displaced, and the like, so that the imaging performance consistency of the finally produced camera is reduced, and the subsequent products are influenced on the high-precision image processing application.

In the prior art, in order to improve the active alignment quality of different camera modules, active alignment equipment suppliers or module manufacturers often need to manually debug in advance for active alignment of different camera products, active alignment graphic cards are replaced according to the characteristics of cameras, the field illumination environment is adjusted and the like, so that the image quality of an active alignment calculation area can reach the best active alignment result, new requirements are brought to the material and diversity of the active alignment graphic cards and the diversity of illumination elements, higher requirements are provided for the professional of active alignment equipment debugging personnel, and the situation that the active alignment equipment debugging personnel can be stabilized due to repeated debugging of the difference of knowledge surfaces and trial production for many times often occurs. In order to solve the existing active alignment technology and have defects, the utility model provides an active alignment system to solve the technical problem that the existing active alignment technology exists.

Disclosure of Invention

In order to solve the technical defect who exists among the prior art, the utility model provides an initiative alignment system of camera module, include:

the device comprises an industrial personal computer, a CMOS chip and an ISP chip which are arranged on a PCB, a lens barrel provided with a lens and a hardware switching device, wherein one end of the hardware switching device is connected with the CMOS chip and/or the ISP chip, and the other end of the hardware switching device is connected with the industrial personal computer;

hardware switching device is equipped with CMOS chip, IPS chip assorted communication interface, includes: 100base-T1 Ethernet interface, RS-232-C, RS-422, RS485, USB interface, I2C interface, LVDS interface;

the industrial personal computer communicates with the CMOS chip and the ISP chip through the hardware switching device and configures parameters of the CMOS chip and the ISP chip.

An active alignment system of a camera module is further provided with a first clamp and a second clamp which are arranged at an active alignment station; the first clamp is used for adjusting the lens barrel to translate or rotate, and the second clamp is used for fixing the PCB to translate or rotate.

An active alignment system of camera module, further, the active alignment station includes: the camera module comprises a diffuse reflection light shield and a diffuse reflection graphic card, wherein the diffuse reflection light shield is used for shielding light, and the diffuse reflection graphic card is used for providing a reference image formed after shooting for the camera module.

An active alignment system of a camera module further adopts a laser instrument to perform laser alignment on the positive center of a diffuse reflection graphic card and the positive center of a lens.

An active alignment system of a camera module further comprises an active alignment station which comprises at least 2 surface array light sources.

The utility model provides an initiative alignment system of camera module, further, hardware switching device be equipped with industrial computer assorted interface, specifically include: one or more of a USB interface, an HDMI interface, a VGA interface and an RJ45 Ethernet interface;

the hardware switching device comprises: the system comprises an MCU, a wireless communication chip, a video link chip, a 100base-T1 PHY chip and a 100base-Tx PHY chip, wherein the wireless communication chip, the video link chip, the 100base-T1 PHY chip and the 100base-Tx PHY chip are respectively connected with the MCU;

the 100base-Tx PHY chip is connected with the Ethernet interface of RJ45, and the 100base-T1 PHY chip is connected with the Ethernet interface of 100 base-T1.

An active alignment system of a camera module, further, the imaging data of CMOS chip is transmitted to the hardware switching device through LVDS interface or 100base-T1 interface in the hardware switching device after analog-to-digital conversion through ISP, and is transmitted to the industrial personal computer through HDMI interface or VGA interface or 100base-T1 interface in the hardware switching device;

the signals transmitted by the Ethernet interface of 100base-T1 include: video signals and control signals.

The utility model provides an active alignment system of camera module, further, the industrial computer includes: the system comprises an active alignment image calculation module, an MTF calculation analysis module and an optimal active alignment parameter judgment module;

an active alignment image calculation module configured to calculate an image region formed by active alignment;

the MTF calculation analysis module is configured for performing MTF calculation according to the result of the active alignment image calculation module;

and the optimal active alignment parameter judging module is configured to judge whether the parameter is the optimal active alignment parameter according to the MTF calculation result.

The utility model provides an active alignment system of camera module, further, the industrial computer includes: and the CMOS chip and the ISP chip adjusting module are configured to issue a control instruction to modify the parameters of the CMOS chip and/or the ISP chip according to the calculation result of the image.

An active alignment system of a camera module is further provided, and a wireless communication chip comprises one or more of 2G, 3G, 4G, 5G, WIF and Bluetooth.

Has the advantages that:

1. the utility model provides an among the technical scheme, hardware switching device adopts multiple different interfaces, can compatible current different CMOS chip and ISP chip, in addition, can transmit video signal and control signal through the ethernet interface, avoids traditional 2 links of needs to transmit respectively, and its efficiency improves. When the imaging condition is not met, the industrial personal computer can configure the CMOS chip and the ISP chip on the PCB in real time through the hardware switching device.

2. The utility model provides an among the technical scheme, aim at the station and adopted diffuse reflection lens hood and diffuse reflection picture card, thereby the diffuse reflection lens hood avoids light to carry out multiple reflection in the station and makes the initiative aim at the regional illumination of picture card part inhomogeneous, and diffuse reflection material picture card makes the calculation region after the initiative alignment imaging only sword limit information under the diffuse reflection material parcel initiative aims at the station condition, can obtain comparatively accurate result, reduces the interference of non-sword limit image.

3. The utility model provides an among the technical scheme, adopt the laser instrument to carry out the accurate centering of laser to picture card positive center and camera lens positive center, avoided all being in the correct position of adjusting when all modules, but certain batch camera module after the initiative is aimed at is formed like still can have certain error, influences the problem of the initiative alignment assembly precision.

Drawings

The following drawings are only schematic illustrations and explanations of the present invention, and do not limit the scope of the present invention.

Fig. 1 is a schematic view of an active alignment system of a camera module according to an embodiment of the present invention.

Fig. 2 is a structural diagram of a hardware device according to an embodiment of the present invention.

Fig. 3 is a schematic diagram of an industrial personal computer including an active alignment image calculation module, an MTF calculation and analysis module, a CMOS chip and ISP chip parameter configuration adjustment module, and an optimal active alignment parameter decision module according to an embodiment of the present invention.

Detailed Description

In order to more clearly understand the technical features, objects, and effects herein, embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout. For the sake of simplicity, the drawings schematically show the relevant parts of the invention, and do not represent the actual structure of the product. In addition, for simplicity and clarity of understanding, only one of the components having the same structure or function is schematically illustrated or labeled in some of the drawings.

As for the control system, the functional module, application program (APP), is well known to those skilled in the art, and may take any suitable form, either hardware or software, and may be a plurality of functional modules arranged discretely, or a plurality of functional units integrated into one piece of hardware. In its simplest form, the control system may be a controller, such as a combinational logic controller, a micro-programmed controller, or the like, so long as the operations described herein are enabled. Of course, the control system may also be integrated as a different module into one physical device without departing from the basic principle and scope of the present invention.

The utility model discloses in "connect", can include direct connection, also can include indirect connection, communication connection, electricity and connect except that the particular description.

Specifically, the present embodiment provides an active alignment system of a camera module, as shown in fig. 1 to 2, including:

The first clamp and the second clamp are arranged at the active alignment station; the first clamp is used for adjusting the lens cone to translate or rotate, and the second clamp is used for fixing the PCB to translate or rotate; the control command is issued to the clamp controller through the industrial personal computer during the translation and rotation angle of the clamp, the clamp controller 1 controls the first clamp, the clamp controller 2 controls the second clamp, the clamp controller 1 or the clamp controller 2 is respectively connected with the corresponding stepping motor, and then the movement of the clamp is driven through the movement of the stepping motor to achieve the translation or rotation of the lens cone or the PCB.

Specifically, in the prior art, the alignment of the lens barrel and the PCB is controlled by the first clamp and the second clamp, and the translation or rotation of the lens barrel and the translation or rotation of the PCB are calculated by performing MTF on the acquired image in the image card, so that the translation and rotation of the lens barrel and the PCB are adjusted by the clamps, respectively, to complete the alignment. However, there is a great disadvantage that, in this way, only the shots of the same batch can be used, and if the camera modules of different batches or different types are replaced, the graphic card needs to be replaced and the station illumination environment needs to be rearranged for adjustment. Therefore, in this embodiment, a hardware switching module is provided, and a CMOS chip and an ISP chip in a camera module that has not been assembled are connected to an industrial personal computer, so that both sides can implement data signal communication and control signal communication with each other. Compare in the tradition hardware switching module that can only carry out data signal communication, the utility model provides a hardware switching device can carry out two-way communication for when the parameter that calculates through MTF is unsatisfied the condition, the difference is through changing the picture card or changing the ambient light condition, can carry out the parameter regulation through adjusting CMOS chip and ISP chip, until obtaining the MTF calculation analysis module result of comparatively matching.

The active alignment station includes: the camera module comprises a diffuse reflection light shield and a diffuse reflection graphic card, wherein the diffuse reflection light shield is used for shielding light, and the diffuse reflection graphic card is used for providing a reference image formed after shooting for the camera module.

Specifically, a black diffuse reflection light shield is adopted to wrap an actively aligned station; the graph card material of the active alignment adopts a diffuse reflection material graph card.

The diffuse reflection light shield can be made of black flannelette or a curtain, so that light rays are prevented from being reflected for multiple times in a station, and illumination of partial areas of the active alignment chart is not uniform;

the diffuse reflection material graphic card is adopted to avoid the phenomenon that the graphic card reflects an image of a lighting device or an image of an active alignment device under illumination, so that non-edge image information appears in an active alignment calculation area, the reflection material graphic card can reflect surrounding scenes to influence the active alignment calculation area, and the diffuse reflection material graphic card only has edge information in the active alignment calculation area under the condition that the diffuse reflection material wraps an active alignment station.

A laser instrument is adopted to carry out laser accurate centering on the positive center of the graphic card and the positive center of the lens;

when the CMOS mounting position or the lens barrel deviates in the assembling process, the lens needs to be moved and rotated to correct the influence of the error on the optical path in the active alignment, the movable range between the actual lens barrel and the lens is very small, when the feeding error is controlled within a certain range, the degree of freedom of the active alignment can meet the production requirement, and in this case, if other production or mounting errors are introduced, the degree of freedom on one side is not enough to meet the accuracy of the active alignment. When all modules are in the correct positions for adjustment, certain errors still exist in the camera module images of certain batches after active alignment, and the active alignment assembly accuracy is affected. After a lot of experiments and data analysis, the inventor finds that the reason is caused by inaccurate alignment of the active alignment chart and the camera module. In order to solve the problem, the utility model discloses a laser instrument carries out the accurate centering of laser to the positive center of graphic card and lens positive center, can reduce the skew at image center and actual graphic card center to this problem has been solved.

Specifically, by rotating the card so that the edge of the active alignment calculation region where the image is acquired forms an angle θ, the value of θ can be within 2-10 degrees of vertical or horizontal offset.

The calculation of MTF (modulation Transfer function) is carried out by adopting a card edge area, MTF calculation methods integrated by different active alignment equipment suppliers are diversified for the performance of the edge, and the angle of the edge has correlation on the actual fit with the MTF calculation method, so that the MTF convergence is better for a certain rotation angle range. Therefore, the graph card is rotated to enable the edge of the active alignment calculation area of the collected image to form an angle theta, so that the MTF calculation accuracy is higher, the specific theta value can be within the range of 2-10 degrees of vertical or horizontal deviation, and a better effect can be obtained.

At least 2 surface array light sources are adopted for active alignment;

as shown in fig. 2, the hardware switching device is provided with an interface matched with an industrial personal computer, and specifically comprises: one or more of a USB interface, an HDMI interface, a VGA interface and an RJ45 Ethernet interface;

the 100base-Tx PHY chip is connected with an Ethernet interface of RJ45, and the 100base-T1 PHY chip is connected with an Ethernet interface of 100 base-T1;

imaging data of the CMOS chip is subjected to analog-to-digital conversion by an ISP (internet service provider), then transmitted to a hardware switching device through an LVDS (low voltage differential signaling) interface or a 100base-T1 interface in the hardware switching device, and transmitted to an industrial personal computer through an HDMI (high-definition multimedia interface) interface or a VGA interface or a 100base-T1 interface in the hardware switching device;

The key hardware of the camera is a CMOS chip and an ISP chip, wherein the CMOS chip is responsible for collecting images, the ISP chip is responsible for processing image quality, the basic functions of the CMOS chip are realized by register configuration, the CMOS chip has the functions of exposure time, analog gain and digital gain setting, different CMOS chips correspond to different register addresses and configuration value ranges, the ISP chip has the functions of sharpening, automatic exposure, automatic gain control and gamma curve configuration, different ISP chips have different register addresses and configuration values, where a function corresponds to a set of register addresses, different configuration values enable the function to behave differently, such as an exposure time register address, the exposure time is changed from short to long when the configuration value is changed from small to large, and under the condition that other register values are not changed, the image is changed from dark to light, and a parameter configuration table is formed by presetting a plurality of groups of configuration values for a function register address.

Video data of the camera needs to be transmitted to an industrial personal computer which actively aligns software to operate through an LVDS interface or an Ethernet interface, a general video signal needs to be converted into an HDMI or VGA interface from the LVDS interface or the Ethernet interface to be connected to the industrial personal computer through interface switching, so that the camera signal is transmitted into a data link of AA computing software, hardware for completing the switching function is a hardware switching device, video signal transmission is carried out singly, but in the prior art, a transmission video link and a transmission control signal are divided into two different links. For example, the industrial personal computer is respectively connected with the hardware switching device through an HDMI (or VGA) and a USB, transmits video data through the HDMI and transmits control signals through the USB.

The hardware switching device is characterized in that the hardware switching device is communicated with a PC network interface and a USB interface according to a camera configuration interface besides an original video link hardware channel, particularly the PC Ethernet interface, the camera has bidirectional communication capability, video signals can be transmitted to the industrial personal computer, control instructions sent by the industrial personal computer to the camera, such as CMOS/ISP parameter configuration, can be received, the industrial personal computer outputs the control instructions outwards through a USB port or a serial port, the industrial personal computer sends the control instructions to the camera through the USB port or the serial port, the control instructions are converted to the camera configuration interface through the hardware switching device, video signals of the camera are transmitted to the hardware switching device through an LVDS interface, and then are converted into HDMI or VGA signals to the industrial personal computer through a communication interface switching module;

the hardware switching device receives a control command sent by the industrial personal computer through the Ethernet and then transmits the control command to the camera, and a video signal sent by the camera through the Ethernet is received and transmitted to the industrial personal computer through the Ethernet, so that a bidirectional communication link configured from the industrial personal computer and the camera is realized, and the real-time configuration of the required CMOS/ISP parameters is completed.

As shown in fig. 3, the industrial personal computer includes: the system comprises an active alignment image calculation module, an MTF calculation analysis module and an optimal active alignment parameter judgment module;

The industrial computer still includes: and the CMOS chip and the ISP chip adjusting module are configured to issue a control instruction to modify the parameters of the CMOS chip and/or the ISP chip according to the calculation result.

The wireless communication chip includes one or more in 2G, 3G, 4G, 5G, WIF, the bluetooth, through the wireless communication chip, can directly upload data to the high in the clouds server and calculate and verify, saves in-process data for the problem emergence can be traced back in subsequent production process, in time finds out the reason.

What has been described above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It is clear to those skilled in the art that the form in this embodiment is not limited thereto, and the adjustable manner is not limited thereto. It is understood that other modifications and variations directly derivable or suggested by a person skilled in the art without departing from the basic idea of the invention are considered to be within the scope of protection of the invention.

Claims

1. An active alignment system of a camera module, comprising: the device comprises an industrial personal computer, a CMOS chip and an ISP chip which are arranged on a PCB, a lens barrel provided with a lens and a hardware switching device, wherein one end of the hardware switching device is connected with the CMOS chip and/or the ISP chip, and the other end of the hardware switching device is connected with the industrial personal computer;

2. The active alignment system of claim 1, wherein the first and second fixtures are mounted to the active alignment station; the first clamp is used for adjusting the lens barrel to translate or rotate, and the second clamp is used for fixing the PCB to translate or rotate.

3. The active alignment system of claim 2, wherein the active alignment station comprises: the camera module comprises a diffuse reflection light shield and a diffuse reflection graphic card, wherein the diffuse reflection light shield is used for shielding light, and the diffuse reflection graphic card is used for providing a reference image formed after shooting for the camera module.

4. The active alignment system of claim 3, wherein the laser alignment is performed on the center of the diffuse reflection graphic card and the center of the lens by a laser.

5. The active alignment system of claim 1, wherein the active alignment station comprises at least 2 area array light sources.

6. The active alignment system of a camera module according to claim 1, wherein the hardware adapter is provided with an interface matched with an industrial personal computer, and specifically comprises: one or more of a USB interface, an HDMI interface, a VGA interface and an RJ45 Ethernet interface;

7. The active alignment system of a camera module as claimed in claim 6, wherein the imaging data of the CMOS chip is analog-to-digital converted by the ISP, transmitted to the hardware adapter through the LVDS interface or the 100base-T1 interface of the hardware adapter, and transmitted to the industrial personal computer through the HDMI interface or the VGA interface or the 100base-T1 interface of the hardware adapter;

8. The active alignment system of a camera module of claim 1, wherein the industrial personal computer comprises: the system comprises an active alignment image calculation module, an MTF calculation analysis module and an optimal active alignment parameter judgment module;

9. The active alignment system of a camera module of claim 8, wherein the industrial personal computer comprises: and the CMOS chip and the ISP chip adjusting module are configured to issue a control instruction to modify the parameters of the CMOS chip and/or the ISP chip according to the calculation result of the image.

10. The active alignment system of claim 6, wherein the wireless communication chip comprises one or more of 2G, 3G, 4G, 5G, WIF and Bluetooth.