Cooperative cleaning method and adhesion device for camera module image sensor

Abstract

The invention discloses a collaborative cleaning method and an adhesion device for a camera module image sensor, and provides a collaborative cleaning scheme of first wiping and then adhesion in order to solve the technical problems of tool chippings and cleaning liquid residues caused by automatic wiping in the prior art. The method comprises the following steps: firstly wiping and cleaning the sensing surface of the image sensor (S1), then removing wiping residues by using an adhesion device (S2), and finally judging the cleaning effect through visual inspection (S3). A matched adhesion device comprises a cleaning adhesive tape winding and unwinding system, a soft pressing head and a control system, and efficient removal of wiping residues is achieved by accurately controlling adhesive tape adhesion (the adhesive force is 1-5 N / 25 mm) and stepping replacement (the replacement length each time is larger than or equal to the long edge of the rectangle of the sensing face of the image sensor). According to the method, the technical prejudice of the industry is broken through, the traditional wiping and adhesion processes which are considered to repel each other are organically combined, the cleaning yield of automatic equipment of the camera module is increased to 99% or above, and the key technical problem that residues are generated during wiping is solved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of precise electronic component cleaning, and specifically relates to a cooperative cleaning method and an adhering device for a camera module image sensor. BACKGROUND

[0002] The camera module referred to in the application is a camera module using a hard circuit board, including a security camera module, a vehicle-mounted camera module, a computer USB camera module and a car recorder camera module, and the hard circuit board of the camera module is welded with an image sensor, which is the most critical electronic component for imaging. Dust or dirt on the sensing surface of the image sensor will be magnified by thousands or tens of thousands of times in the image after the lens is installed, and the cleanliness of the sensing surface of the image sensor directly affects the image quality of the camera module. Therefore, the cleaning method, steps and device in the production process of the camera module are crucial. The existing technology is basically based on manual cleaning, and the following several patent documents all hope to improve the low efficiency of manual cleaning through automatic equipment. However, due to the following serious technical biases, the yield of automatic cleaning of the camera module (except for the mobile phone camera module) has not been improved, which affects the popularization and use of the automatic cleaning equipment, and at present, manual cleaning is still the main method.

[0003] The technical biases are as follows: One, technical bias 1: the technical personnel in the field did not find that wiping would produce its own residues, such as patent application No. 2021224733029 paragraph 0002: "the existing technology is mainly manual wiping, the force and uniformity of human hand are unstable during wiping, resulting in low definition and yield rate of security camera light sensing element". This technical bias is due to the fact that "wiping self-generated residues" is a problem that existing technology has not recognized. Through continuous research, we found that automatic wiping actually removes the original dust and dirt, but the automatic wiping tool such as dust cloth and alcohol stain is left on the image sensor sensing surface, so automatic wiping cannot solve the problem of wiping itself. Because the N+1th wiping removes the residues generated by the Nth wiping, the N+1th wiping itself will leave residues on the image sensor sensing surface. The yield rate of such automatic wiping depends on whether the residues generated by the last wiping are left after the last wiping, which is completely uncertain, which is the fundamental reason why the cleaning yield rate of existing automatic cleaning equipment is difficult to break through. Manual wiping is different from each wiping because the naked eye always tracks the cleaning effect of each wiping, and the intensity of each wiping is different. The naked eye can observe the position and state of the residues generated by the Nth wiping immediately after the Nth wiping, and the N+1th wiping will adjust the intensity, uniformity and direction until the naked eye sees that the residues left by wiping are completely cleaned. The last wiping, the cleaning yield rate is almost 100%. The defective product of manual wiping is not due to the fact that the wiping is not clean, but due to the fact that the naked eye of the human body is tired and missed detection. The technical personnel in the field believe that the mechanical action of automatic wiping device is superior to the wiping action of human hand, which is completely a technical bias and a result of lack of understanding of "wiping self-generated residues". As a result, the traditional camera module cleaning equipment does not solve the technical problem of secondary pollution caused by wiping tool itself.

[0004] Two, technical bias 2: From the above several existing patent documents, it can be seen that the common technical path adopted is that wiping and adhesion are mutually exclusive, non-A is B. None of them mentions that automatic wiping will produce debris / residues, and no adhesion means is used to deal with this problem, without wiping and adhesion collaborative process.

[0005] Three, objective reasons for technical bias: The camera module must be formed by welding the image sensor on the circuit board of the camera module. The camera module referred to in the present application uses a rigid circuit board, which uses a patch process to weld the image sensor. In the production process, the image sensor must pass through a 270-degree high-temperature reflow soldering furnace. The hot air in the reflow soldering furnace is mixed with dust and flux (main component is rosin) everywhere. The dust and rosin are easily attached to the sensing surface of the image sensor. The adhesion of rosin is greater than the adhesion of the cleaning tape. The dust removal process cannot remove the rosin on the sensing surface of the image sensor. The rosin on the sensing surface of the image sensor must be removed by a cleaning method using a cleaning solvent and wiping. Therefore, the person skilled in the art believes that the cleaning method using a cleaning solvent and wiping also removes other dirt and dust when removing the rosin. There is no need to add an adhesion method to remove dust, which is the objective reason for the mutual exclusion of wiping and adhesion.

[0006] It can be seen that the technical bias in the art is that the use of adhesion must exclude wiping, and the use of wiping must exclude adhesion. This proves that the industry avoids the combination of dry adhesion and wet cleaning and has never considered the cooperative work of wiping and adhesion to remove the residues generated by wiping itself.

[0007] Due to the above-mentioned serious technical bias, the existing camera module automatic cleaning method and device cannot effectively remove the tool debris and liquid residues (secondary pollution) generated by the wiping step itself, which makes it difficult to break through the cleaning yield and hinders the popularization and application of automatic cleaning equipment in the field. SUMMARY

[0008] The purpose of the present application is to solve the technical bias in the prior art and provide a cooperative cleaning method for the image sensor of a camera module and an adhesion device for removing residues generated by wiping.

[0009] The present application adopts the following technical solutions: A cooperative cleaning method for the image sensor of a camera module, comprising the following steps: S1, wiping and cleaning the sensing surface of the image sensor; S2, using an adhesion device to adhere to the sensing surface of the image sensor after wiping in step S1 to remove the residues of the wiping tool; S3, detecting the sensing surface of the image sensor after step S2 by a visual detection device. If the detection is qualified, the cleaning method ends. If the detection is not qualified, steps S2 and S3 are repeated in turn. The number of repetitions is limited by the production cycle.

[0010] Preferably, the residues of the wiping tool in step S2 include wiping tool debris and / or residual cleaning liquid.

[0011] Preferably, the time interval between the step S1 and the step S2 is less than 20 seconds.

[0012] Preferably, the step S1 and the step S2 are independently performed by physical isolation.

[0013] An adhesive device for the collaborative cleaning method of the image sensor, comprising a cleaning tape winding and unwinding system, a pressing head, a control system, the pressing end of the pressing head is made of soft material, the cleaning tape winding and unwinding system, the pressing head and the control system are located between the wiping and cleaning device and the visual detection device of the sensing surface of the image sensor.

[0014] Preferably, the cleaning tape winding and unwinding system comprises a winding disc, a winding disc, a cleaning tape, and a preset distance between the winding disc and the winding disc, the pressing head is located between the winding disc and the winding disc, the axis of the winding disc is parallel to the axis of the winding disc, at least one end surface of the winding disc is parallel to one end surface of the winding disc, the cleaning tape has a first part, a second part and a third part, the first part of the cleaning tape is wound on the winding disc, the second part is wound on the winding disc, and the third part is located between the winding disc and the winding disc.

[0015] Preferably, the pressing direction of the pressing head is perpendicular to the axis of the winding disc and parallel to the end surface of the winding disc.

[0016] Preferably, after the control system controls the pressing head to press once, the control system controls the winding disc to wind the cleaning tape with a length of X, and at the same time, the winding disc releases the cleaning tape with a length of X, and the value of X is greater than or equal to the length of the rectangular long side of the sensing surface of the image sensor to be cleaned.

[0017] Preferably, the adhesive force of the cleaning tape is 1-5N / 25mm.

[0018] Preferably, it further comprises an up-down moving support and a rotating motor, the winding disc and the winding disc are arranged on the front side wall of the up-down moving support, the pressing head is arranged vertically downward between the winding disc and the winding disc on the front side wall of the up-down moving support, a limiting wheel is arranged on each side of the pressing head on the front side wall of the up-down moving support, both limiting wheels are located below the whole formed by the winding disc and the winding disc, the non-connection surface of the part of the cleaning tape between the winding disc and the winding disc contacts the outer side of the two limiting wheels and the lower end of the pressing head, the rotating motor is arranged on the up-down moving support, and the axis of the output shaft of the rotating motor coincides with the axis of the winding disc.

[0019] Preferably, the mounting bracket, the up-down moving mechanism, the non-moving end face of the up-down moving mechanism is fixed on the up-down moving bracket, and the moving end face of the up-down moving mechanism is fixed on the mounting bracket.

[0020] Preferably, the output end signal of the control system is connected with the rotating motor and the up-down moving mechanism, the output shaft of the rotating motor is drivingly connected with the winding rotary disc, the rotating motor controls the winding of the cleaning rubber belt, and the up-down moving mechanism controls the up-down movement of the up-down moving bracket and the winding rotary disc, the rotating motor, the cleaning rubber belt, the limiting wheel and the pressing head mounted on the up-down moving bracket.

[0021] The present application has the following advantages: 1. The present application is not to remove the original dust and dirt, but to remove the residues generated by the wiping itself. The present application overcomes the technical prejudice in the field, and inserts the adhesive device after the wiping device, removes the residues generated by the wiping itself by using the adhesive, realizes the synergistic cleaning, and has better effect than the wiping and the adhesive used independently.

[0022] 2. The cleaning yield of the existing camera module automatic cleaning equipment is improved to more than 99%, and the effect of 1+1>2 is realized. The technical personnel in the field are difficult to think of this simple solution due to the long-term influence of the technical prejudice. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the specific embodiment of the present application, the application will be further described in detail below according to the specific embodiments of the present application and in combination with the drawings.

[0024] Figure 1 The step flow chart of the synergistic cleaning method of the present application is shown in the figure. Figure 2 The structure diagram of the adhesive device of the present application is shown in the figure. Figure 3 The contact state diagram of the pressing head and the image sensor in the adhesive device is shown in the figure. Figure 4 The microscope photo of the sensing surface of the image sensor without cleaning is shown in the figure. Figure 5 The microscope photo of the sensing surface of the image sensor with residues after wiping according to step S1 is shown in the figure. Figure 6 The microscope photo of the completely clean sensing surface of the image sensor is shown in the figure.

[0025] The meanings of the reference signs in the figures are as follows.

[0026] Step S1-101, step S2-102, step S3-103, unwinding turntable 201, winding turntable 202, cleaning rubber belt 203, soft pressing head 204, limiting wheel 205, up-down moving bracket 206, rotating motor 207, up-down moving mechanism 208, mounting bracket 209, image sensor 301, circuit board 302. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0028] A cooperative cleaning method of an image sensor, comprising the following steps: S1, wiping and cleaning 101 the sensing surface of the image sensor; S2, adhering 102 the sensing surface of the image sensor after wiping in step S1 by using an adhering device to remove the residual substances of the wiping tool; S3, detecting 103 the sensing surface of the image sensor after step S2 by using a visual detection device, if the detection is qualified, the cleaning method ends and a good product is obtained, if the detection is unqualified, step S2 and step S3 are repeated in turn, the number of repetitions is limited by the production cycle. In an embodiment, the production cycle is 10 seconds, step S2 is 3 seconds, step S3 is 2 seconds, and the number of repetitions is 2 times.

[0029] Preferably, the residual substances of the wiping tool in step S2 include wiping tool debris and / or residual cleaning liquid. The wiping tool debris and the residual cleaning liquid are described in detail in the accompanying drawings. Figure 5 .

[0030] Preferably, the time interval between step S1 and step S2 is less than 20S. That is, the wiping step ends to the adhering step ends within 20S to prevent the solidification of the residual substances.

[0031] Preferably, step S1 and step S2 are independently carried out by physical isolation, forming a cooperative cleaning mechanism of wet wiping first and dry adhering later.

[0032] An adhering device for the cooperative cleaning method of the image sensor, comprising a cleaning tape 203 winding and unwinding system, a pressing head 204, a control system, the pressing end of the pressing head 204 is made of soft material, the cleaning tape 203 winding and unwinding system, the pressing head 204 and the control system are located between the wiping cleaning device and the visual detection device of the sensing surface of the image sensor 301, the output signal of the control system is connected to the pressing head 204 and the cleaning tape 203 winding and unwinding system, the cleaning tape 203 released by the cleaning tape 203 winding and unwinding system is located within the pressing stroke range of the pressing head 204.

[0033] Preferably, the cleaning tape 203 winding and unwinding system comprises a winding disc 201, a winding disc 202, a cleaning tape 203, a preset distance between the winding disc 201 and the winding disc 202, the pressing head 204 is located between the winding disc 201 and the winding disc 202, the axis of the winding disc 201 is parallel to the axis of the winding disc 202, at least one end surface of the winding disc 201 is parallel to one end surface of the winding disc 202, the cleaning tape 203 has a first part, a second part and a third part, the first part of the cleaning tape 203 is wound on the winding disc 201, the second part is wound on the winding disc 202, and the third part is located between the winding disc 201 and the winding disc 202. After such arrangement, the cleaning tape 203 adheres to the residues on the sensing surface of the image sensor through the third part away from the pressing head 204, the winding disc 201 is used to release the cleaning tape 203, and the winding disc 202 is used to wind the cleaning tape 203 with residues on the winding disc 202.

[0034] Preferably, the pressing direction of the pressing head 204 is perpendicular to the axis of the winding disc 201 and parallel to the end surface of the winding disc 201. Such arrangement avoids the pressing head 204 pressing the cleaning tape 203 askew, so that the cleaning tape 203 does not completely contact the sensing surface of the image sensor 301, and then does not completely adhere to the residues.

[0035] Preferably, after the pressing head 204 is pressed once, the control system controls the winding disc 202 to wind the cleaning tape 203 with a length of X, and at the same time, the winding disc 201 releases the cleaning tape 203 with a length of X, the value of X is greater than or equal to the long side of the rectangle of the sensing surface of the image sensor 301 to be cleaned. This is to enable the cleaning tape 203 with a new area to cover the sensing surface of the image sensor 301 after the pressing head 204 is pressed once.

[0036] Preferably, the adhesive force of the cleaning tape 203 is 1-5N / 25mm, and it has the characteristics of easy tearing and no glue stains.

[0037] Preferably, the pressing head 204 is made of soft material. In an embodiment, the pressing head 204 makes the cleaning tape 203 contact the sensing surface of the image sensor 301 closely with a controllable step pressure of 0.1-0.3 N for 1-3 seconds.

[0038] Preferably, the control system further comprises a moving-up-and-down bracket 206, and a rotating motor 207. The unwinding turntable 201 and the winding turntable 202 are arranged on the front side wall of the moving-up-and-down bracket 206. The pressing head 204 is arranged vertically downward between the unwinding turntable 201 and the winding turntable 202 on the front side wall of the moving-up-and-down bracket 206. One limiting wheel 205 is arranged on each side of the pressing head 204 on the front side wall of the moving-up-and-down bracket 206. Both of the limiting wheels 205 are located below the whole formed by the unwinding turntable 201 and the winding turntable 202. The non-connection surface of the part of the cleaning tape 203 between the unwinding turntable 201 and the winding turntable 202 contacts the outer side of the two limiting wheels 205 and the lower end of the pressing head 204. The rotating motor 207 is arranged on the moving-up-and-down bracket 206. The axis of the output shaft of the rotating motor 207 coincides with the axis of the winding turntable 202.

[0039] Preferably, the control system further comprises a mounting bracket 209 and a moving-up-and-down mechanism 208. The non-moving end surface of the moving-up-and-down mechanism 208 is fixed on the mounting bracket 209. The moving end surface of the moving-up-and-down mechanism 208 is fixed on the moving-up-and-down bracket 206.

[0040] Preferably, the output end signal of the control system is connected with the rotating motor 207 and the moving-up-and-down mechanism 208. The output shaft of the rotating motor 207 is in transmission connection with the winding turntable 202, so as to control the winding of the cleaning tape 203. The moving-up-and-down mechanism 208 controls the vertical up-and-down movement of the moving-up-and-down bracket 206 and the whole formed by the unwinding turntable 201, the winding turntable 202, the rotating motor 207, the cleaning tape 203, the limiting wheels 205, and the pressing head 204 arranged on the moving-up-and-down bracket 206.

Claims

1. A collaborative cleaning method for a camera module image sensor, characterized in that: The method comprises the following steps: S1, wiping the sensing surface of the image sensor; S2, using an adhesion device to adhere to the sensing surface of the image sensor after wiping in step S1 to remove the residual material of the wiping tool; S3, detecting the sensing surface of the image sensor after step S2 by a visual detection device, if the detection is qualified, the cleaning method ends, if the detection is not qualified, steps S2 and S3 are repeated in turn; the number of repetitions is limited by the production cycle.

2. The method of claim 1, wherein: The residual material of the wiping tool in step S2 includes wiping tool debris and / or residual cleaning liquid.

3. A method of cooperative cleaning of an image sensor according to any one of claims 1 or 2, characterized in that: The time interval between step S1 and step S2 is less than 20S.

4. The method of claim 1, wherein: Step S1 and step S2 are independently carried out by physical isolation.

5. An adhesive device for use in the method of claim 1 for cooperative cleaning of a camera module image sensor, wherein: It comprises a cleaning tape winding and unwinding system, a pressing head, and a control system. The pressing end of the pressing head is made of soft material. The cleaning tape winding and unwinding system, the pressing head, and the control system are located between the wiping cleaning device and the visual detection device of the sensing surface of the image sensor.

6. The adhesive device of claim 5, wherein: The cleaning tape winding and unwinding system comprises a winding disc, a winding disc, and a cleaning tape. The winding disc and the winding disc are pre-set at a distance. The pressing head is located between the winding disc and the winding disc. The axis of the winding disc is parallel to the axis of the winding disc. At least one end face of the winding disc is parallel to one end face of the winding disc. The cleaning tape has a first part, a second part, and a third part. The first part of the cleaning tape is wound on the winding disc. The second part is wound on the winding disc. The third part is located between the winding disc and the winding disc.

7. The adhesive device of claim 5, wherein: The pressing direction of the pressing head is perpendicular to the axis of the winding disc and parallel to the end face of the winding disc.

8. The adhesive device of claim 5, wherein: After the control system controls the pressing head to press once, the control system controls the winding disc to wind the cleaning tape with a length of X. At the same time, the winding disc releases the cleaning tape with a length of X. The value of X is greater than or equal to the length of the rectangular long side of the sensing surface of the image sensor to be cleaned.

9. The adhesive device of claim 5, wherein: The adhesive force of the cleaning tape is 1-5N / 25mm.

10. The adhesive device of claim 5, wherein: It also comprises an up-down moving bracket and a rotating motor. The winding disc and the winding disc are arranged on the front side wall of the up-down moving bracket. The pressing head is arranged vertically downward between the winding disc and the winding disc on the front side wall of the up-down moving bracket. A limiting wheel is arranged on each side of the pressing head on the front side wall of the up-down moving bracket. Both limiting wheels are located below the whole formed by the winding disc and the winding disc. The non-connection surface of the part of the cleaning tape between the winding disc and the winding disc contacts the outer side of the two limiting wheels and the lower end of the pressing head. The rotating motor is arranged on the up-down moving bracket. The axis of the output shaft of the rotating motor coincides with the axis of the winding disc.

11. The adhesive device of claim 5, wherein: It also comprises a mounting bracket and an up-down moving mechanism. The moving end face of the up-down moving mechanism is fixed on the up-down moving bracket. The non-moving end face of the up-down moving mechanism is fixed on the mounting bracket.

12. The adhesive device of claim 5, wherein: The output signal of the control system is connected with the rotating motor and the up-down moving mechanism, the output shaft of the rotating motor is drivingly connected with the winding rotary disc, the winding rotary disc controls the winding of the cleaning rubber belt, and the up-down moving mechanism controls the up-down moving of the up-down moving support and the winding rotary disc, the rotating motor, the cleaning rubber belt and the pressing head installed on the up-down moving support vertically move up and down as a whole.

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