Camera module and assembling method thereof

Abstract

The invention relates to a camera module and an assembling method thereof. The camera module comprises a circuit board; the COMS is attached to the circuit board in a covering mode, and a first module is obtained after the COMS is subjected to pressure welding on the circuit board; a lens; the lens mounting assembly comprises a lens mounting sleeve surrounding the lens and a lens mounting base which is in threaded fit with the lens mounting sleeve to adjust the height between the lens and the COMS, the lens and the lens mounting sleeve are fixed through mucilage glue, and a second module is obtained after the lens and the lens mounting assembly are assembled. According to the invention, primary correction and secondary compensation type correction are carried out on the optical axis within the allowable error range through the camera active focusing device and the lens installation assembly, defective products can be accurately discriminated, the yield of the COMS camera module can be effectively improved, the automatic focusing accuracy is improved, the production cost is reduced, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of camera design and production, in particular to a camera module and an assembling method thereof. Background Art

[0002] At present, the camera module packaging process involves multiple assembly of parts and components such as image sensors, lenses, lens holders, filters, circuit boards, front and rear covers, etc., and traditional packaging technologies such as chip-level packaging processes are directly assembled according to set tolerance parameters. As the number of superimposed parts increases, the final matching tolerance becomes larger and larger, and the effect presented on the camera is that the clearest position of the picture may deviate from the center of the picture when taking pictures, and the clarity of the four corners of the picture is uneven. With the increasing resolution of image sensor chips and the continuous reduction of single pixel size, the precise matching of lenses and image sensor chips is becoming more and more difficult. Especially for vehicle-mounted cameras, the optical axis error of the lens and image sensor will directly affect the accuracy of the intelligent system's judgment of the position of the vehicle body and the surrounding environment. For example, the optical axis deviation of tens of microns between the lens and the image sensor will reach tens of centimeters in the distance between the vehicle body and the surrounding environment, which will seriously affect the safety of driving.

[0003] How to improve the yield rate by improving the optical axis correction accuracy and autofocus accuracy of COMS packaging is an issue that many companies and research institutes are currently concerned about. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a camera module and an assembly method thereof. The technical problem to be solved by the present invention is achieved by adopting the following technical solutions:

[0005] A camera module, comprising:

[0006] Circuit boards;

[0007] COMS is attached to the circuit board and pressed and welded to the circuit board to obtain module No. 1;

[0008] Lens;

[0009] The lens mounting assembly includes a lens mounting sleeve surrounding the lens and a lens mounting base threadedly matched with the lens mounting sleeve to adjust the height between the lens and COMS. The lens and the lens mounting sleeve are fixed by adhesive. After the lens and the lens mounting assembly are assembled, a second module is obtained.

[0010] The lens mounting base comprises a receiving portion for accommodating a lens mounting sleeve and a surrounding portion which is connected to the receiving portion and extends downward, the surrounding portion is fixed on the circuit board by glue, and the COMS is distributed in the space surrounded by the surrounding portion.

[0011] The lens mounting sleeve is hollow in the middle and has holes at the upper and lower ends. Meanwhile, the diameter of the hole at the upper end of the lens mounting sleeve is smaller than the diameter of the hole at the lower end.

[0012] The lens mounting sleeve and the lens mounting base are respectively provided with external threads and internal threads, and the height between the lens and COMS is adjusted by the threads so that the optimal imaging height between the lens and COMS is achieved.

[0013] Glue injection holes are provided on both sides of the lens mounting base and are connected to the internal threads. After the lens height is adjusted, glue is injected through the glue injection holes to fix the positions of the lens mounting sleeve and the lens mounting base.

[0014] A method for assembling a camera module, the method comprising the following steps:

[0015] Step 1: Clean and dry the circuit board, COMS and lens;

[0016] Step 2: Apply the COMS to the circuit board and perform pressure welding, and then clean and dry it after welding to obtain module No. 1;

[0017] Step 3: Place the lens in the middle cavity of the lens mounting sleeve and fit it tightly against the upper and lower ends of the lens mounting sleeve. Then fill the lens mounting sleeve with foam or gaskets to adjust the central axis of the lens and lens mounting sleeve parts to coincide, and glue them in place for reinforcement.

[0018] Step 4: Match the lens mounting sleeve with the lens and the lens mounting base to obtain module No. 2;

[0019] Step 5: Assemble module No. 1 and module No. 2 so that the lens mounting base matches the positioning point on the circuit board and the surrounding part covers the COMS;

[0020] Step 5: Use the camera active focusing device to detect the overlap between the COMS imaging surface and the optical axis of the lens, and use the camera active focusing device to adjust to the optimal state;

[0021] Step 6: Turn the lens mounting sleeve to adjust the distance between the lens and COMS to achieve the best imaging distance between the lens and COMS;

[0022] Step 7: After the adjustment is completed, inject glue between the external thread and the internal thread through the glue injection hole to fix the lens mounting sleeve and the lens mounting base;

[0023] Step 8: After the glue is fixed, fix the lens mounting base to the circuit board with screws and reinforce it with glue.

[0024] The beneficial effects of the present invention are as follows: the present invention performs primary correction and secondary compensatory correction on the optical axis within the allowable error range through the camera active focusing device and the lens mounting assembly, which can accurately identify defective products and effectively improve the yield rate of COMS camera modules, thereby reducing production costs and improving production efficiency while improving autofocus accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0026] Figure 1 It is a front view of the present invention;

[0027] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0028] Figure 3 A top view of the present invention;

[0029] Figure 4 It is a schematic diagram of the local structure of the lens mounting assembly of the present invention.

[0030] As shown in the figure: 1. Module No. 1; 2. Circuit board; 3. COMS; 4. Lens; 5. Lens mounting assembly; 6. Lens mounting sleeve; 7. Lens mounting base; 8. External thread; 9. Internal thread; 10. Glue injection hole; 11. Module No. 2; 71. Storage part; 72. Surrounding part. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be explained more clearly and completely below in conjunction with the drawings in the embodiments. Of course, the described embodiments are only a part of the present invention but not all of it. Based on this embodiment, other embodiments obtained by those skilled in the art without creative labor are all within the protection scope of the present invention.

[0032] like Figures 1 to 4 As shown, a camera module includes:

[0033] Circuit board 2;

[0034] COMS3 is attached to the circuit board 2 and pressed and welded to the circuit board 2 to obtain module 1;

[0035] Shot 4;

[0036] The lens mounting assembly 5 includes a lens mounting sleeve 6 surrounding the lens 4 and a lens mounting base 7 threadedly matched with the lens mounting sleeve 6 to adjust the height between the lens 4 and COMS 3. The lens 4 and the lens mounting sleeve 6 are fixed by adhesive. After the lens 4 and the lens mounting assembly 5 are assembled, a second module 11 is obtained.

[0037] The lens mounting base 7 includes a storage portion 71 for accommodating the lens mounting sleeve 6 and a surrounding portion 72 connected to the storage portion 71 and extending downward, the surrounding portion 72 is fixed on the circuit board 2 by glue, and the COMS3 is distributed in the space surrounded by the surrounding portion 72; the diameter of the surrounding portion 72 is larger than the storage portion 71 to prevent the lens mounting base 7 from affecting the imaging between the COMS3 and the lens 4.

[0038] The lens mounting sleeve 6 is hollow in the middle and has holes at the upper and lower ends. Meanwhile, the diameter of the hole at the upper end of the lens mounting sleeve 6 is smaller than the diameter of the hole at the lower end.

[0039] The lens mounting sleeve 6 and the lens mounting base 7 are respectively provided with an external thread 8 and an internal thread 9, and the height between the lens 4 and COMS 3 is adjusted by the threads so that the optimal imaging height between the lens 4 and COMS 3 is achieved.

[0040] Glue injection holes 10 are provided on both sides of the lens mounting base 7 and are connected to the internal threads 9. After the height adjustment of the lens 4 is completed, glue is injected through the glue injection holes 10 to fix the positions of the lens mounting sleeve 6 and the lens mounting base 7.

[0041] An external thread 8 is provided on the outer circumference of the lens mounting sleeve 6, and an internal thread 9 is provided on the inner circumference of the storage portion 71 of the lens mounting base 7. The position between the lens mounting base 7 and the lens mounting sleeve 6 is adjusted by threaded cooperation. The structure is simple and efficient with a wide adjustment range, and can adapt to the adjustment of different models of COMS3.

[0042] A method for assembling a camera module, the method comprising the following steps:

[0043] Step 1: Clean and dry the circuit board 2, COMS 3 and lens 4;

[0044] Step 2: Apply COMS3 to circuit board 2 and perform pressure welding, and clean and dry after welding to obtain module 1;

[0045] Step 3: The lens 4 is placed in the middle cavity of the lens mounting sleeve 6 and is tightly attached to the upper and lower ends of the lens mounting sleeve 6. Then, foam or gasket is filled in the lens mounting sleeve 6 to adjust the central axis of the lens 4 and the lens mounting sleeve 6 to coincide with each other, and glue is applied to reinforce the lens 4. After the central axis is adjusted, the filled foam or gasket is withdrawn, and glue is injected. The position between the lens 4 and the lens mounting sleeve 6 is fixed by the curing of the glue.

[0046] Step 4: The lens mounting sleeve 6 equipped with the lens 4 is matched with the lens mounting base 7 to obtain the second module 11;

[0047] Step 5: Assemble the first module 1 and the second module 11, so that the lens mounting base 7 matches the positioning point on the circuit board 2, and the surrounding part 72 covers the COMS 3;

[0048] Step 5: Use the camera active focusing device to detect the overlap between the COMS 3 imaging surface and the optical axis of the lens 4, and use the camera active focusing device to adjust to the optimal state;

[0049] Step 6: Rotate the lens mounting sleeve 6 to adjust the distance between the lens 4 and COMS3 so that the lens 4 and COMS3 reach the optimal imaging distance. In the traditional adjustment method, gaskets of different thicknesses are placed between the lens 4 and COMS3 to test the molding effect. The gaskets need to be replaced many times. The gaskets are worn after repeated use. The assembly leads to large matching tolerances and unclear imaging. At the same time, it can only be done with manual assistance. By matching the external thread 8 and the internal thread 9, the lens mounting sleeve 6 can be rotated to complete the correction of the optimal molding height. The structure is simple, the adjustment method is fast, and it can be adjusted through automated equipment, which effectively improves the production efficiency and debugging accuracy.

[0050] Step 7: After the adjustment is completed, glue is injected between the external thread 8 and the internal thread 9 through the glue injection hole 10 to fix the lens mounting sleeve 6 and the lens mounting base 7; the glue injection operation through the glue injection hole 10 is completed by a pinhole syringe in conjunction with a robot or manually;

[0051] Step 8: After the glue is fixed, the lens mounting base 7 is fixed to the circuit board 2 by screws, and glue is applied for reinforcement. After the reinforcement is completed, the first module 1 and the second module 11 are packaged. Compared with the one-time stacking of parts in the traditional technology, this assembly method can eliminate assembly errors to a large extent through the focal length correction process between modules, which greatly facilitates and improves the debugging work efficiency and saves precious time.

[0052] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A camera module, characterized in that: include: Circuit board (2); A COMS (3) is attached to a circuit board (2) and the COMS (3) is welded to the circuit board (2) to obtain a first module (1); Lens (4); The lens mounting assembly (5) comprises a lens mounting sleeve (6) surrounding a lens (4) and a lens mounting base (7) threadedly matched with the lens mounting sleeve (6) to adjust the height between the lens (4) and the COMS (3); the lens (4) and the lens mounting sleeve (6) are fixed by adhesive; after the lens (4) and the lens mounting assembly (5) are assembled, a second module (11) is obtained.

2. A camera module according to claim 1, characterized in that: The lens mounting base (7) comprises a storage portion (71) for accommodating a lens mounting sleeve (6) and an enclosing portion (72) which is in communication with the storage portion (71) and extends downward, the enclosing portion (72) being fixed to the circuit board (2) by glue, and the COMS (3) being distributed in a space enclosed by the enclosing portion (72).

3. A camera module according to claim 1, characterized in that: The lens mounting sleeve (6) is hollow in the middle and has openings at both ends, and the diameter of the opening at the upper end of the lens mounting sleeve (6) is smaller than the diameter of the opening at the lower end.

4. A camera module according to claim 1, characterized in that: The lens mounting sleeve (6) and the lens mounting base (7) are respectively provided with an external thread (8) and an internal thread (9), and the height between the lens (4) and the COMS (3) is adjusted by the threads so that the height between the lens (4) and the COMS (3) reaches an optimal imaging height.

5. A camera module according to claim 1, characterized in that: Glue injection holes (10) are provided on both sides of the lens mounting base (7), and the glue injection holes (10) are connected to the internal threads (9). After the height adjustment of the lens (4) is completed, glue is injected through the glue injection holes (10) to fix the positions of the lens mounting sleeve (6) and the lens mounting base (7).

6. A camera module assembly method according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: The first step: cleaning and drying the circuit board (2), COMS (3) and lens (4); Step 2: attaching the COMS (3) to the circuit board (2) and performing pressure welding, and then cleaning and drying the circuit board after welding to obtain module No. 1 (1); Step 3: The lens (4) is placed in the middle cavity of the lens mounting sleeve (6) and is tightly attached to the upper and lower ends of the lens mounting sleeve (6), and then foam or gaskets are filled in the lens mounting sleeve (6) to adjust the central axis of the lens (4) and the lens mounting sleeve (6) to coincide, and glue is applied for reinforcement; Step 4: The lens mounting sleeve (6) equipped with the lens (4) is matched with the lens mounting base (7) to obtain the second module (11); Step 5: Assemble the first module (1) and the second module (11) so that the lens mounting base (7) matches the positioning point on the circuit board (2) and the surrounding part (72) covers the COMS (3); Step 5: Use the camera active focusing device to detect the overlap between the COMS (3) imaging surface and the optical axis of the lens (4), and use the camera active focusing device to adjust to the optimal state; Step 6: Rotate the lens mounting sleeve (6) to adjust the distance between the lens (4) and COMS (3) so that the distance between the lens (4) and COMS (3) reaches the optimal imaging distance; Step 7: After the adjustment is completed, glue is injected between the external thread (8) and the internal thread (9) through the glue injection hole (10) to fix the lens mounting sleeve (6) and the lens mounting base (7); Step 8: After the glue is fixed, the lens mounting base (7) is fixed to the circuit board (2) by screws, and glue is applied for reinforcement.

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