CN211880473U

CN211880473U - Camera module

Info

Publication number: CN211880473U
Application number: CN202020607625.5U
Authority: CN
Inventors: 王霁云; 杜跃; 厉兆勇; 朱贺; 王玉磊; 魏敬佩; 魏曼; 翟利; 戴琪
Original assignee: Panasonic Semiconductor Suzhou Co Ltd
Current assignee: Panasonic Automotive Systems Suzhou Co Ltd
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2020-11-06
Anticipated expiration: 2030-04-21

Abstract

The utility model relates to a camera module, which comprises a lens; a circuit board fixedly carrying the image sensor, the circuit board being fixedly connected with the lens; the shell, utilize the connector interconnect between circuit board and the shell, wherein, the connector is floating terminal. The floating terminal can effectively absorb dimensional tolerance and assembly tolerance, and the camera module adopting the structure is difficult to generate stress which enables fixed connection between a circuit board carrying the image sensor and the lens to fail or deviate in the assembly process, so that the relative position between the image sensor and the lens can be effectively determined, the position of the image sensor can be kept on a main optical axis of the lens, and the imaging effect is improved. Meanwhile, the effective absorption of the tolerance can compensate the influence of the replacement of the fixed terminal by the floating terminal on the electrical connection performance, and the electrical connection performance of the connector is kept within an acceptable range.

Description

Camera module

Technical Field

The utility model relates to a camera equipment field, concretely relates to camera module.

Background

An existing camera module, for example, an electronic device such as a mobile device and a notebook computer or a built-in camera module used in a vehicle-mounted industry, is generally provided with at least two circuit boards therein, including an image sensor circuit board and a power supply circuit board.

The power supply circuit board provides power supply output, and an image sensor of the image circuit board acquires imaging information and converts the imaging information into an electric signal to be output. Good imaging quality is obtained, and the image sensor needs to be accurately mounted at the imaging focal position of the lens to ensure the image clarity. Therefore, when assembling, the assembling position of the image sensor and the lens is usually first fixed accurately, and then other components are assembled. However, because the dimensional tolerance of each part of the camera module itself and the assembling process can generate certain assembling tolerance, the two kinds of tolerance accumulation can affect the performance of the camera module.

For example, when the circuit board and the lens are fixed by bonding, the subsequent assembly operation can be performed only after the adhesive is completely dried, or else, in the assembly process, the position relationship between the adjusted image sensor and the lens may be shifted due to internal stress caused by tolerance stack, which affects the imaging performance. In addition, even if the circuit board and the lens are completely fixed, the internal stress due to tolerance stack-up causes a decrease in the electrical connection performance of the electrical connection member.

In order to absorb the dimensional tolerance and the assembly tolerance, one solution in the prior art is to connect the image sensor circuit board and the power supply circuit board by means of a flexible circuit board.

With the demand for miniaturization of camera modules and simplification of assembly processes, there is a need for integrating an image sensor circuit board with a power supply circuit board. With the integration of two circuit boards, it is difficult for those skilled in the art to continue to use the solution of the flexible circuit board to absorb tolerances.

Disclosure of Invention

The camera module has certain performance requirements on each part, and tolerance absorption by the parts is difficult. For example, as for the electrical connection terminals, since high frequency signals are used as signals of the camera module, and the transmission performance of the high frequency signals imposes a certain requirement on the stability of the electrical connection, it is a common choice to use connection terminals fixed to each other for the electrical connection portions. In view of the above, those skilled in the art will generally not consider the use of electrical connections to absorb tolerances.

However, the inventor found that the dimensional tolerance and the assembly tolerance can be effectively absorbed by using the floating terminal as the connector, the effective absorption of the tolerance can compensate the influence of the replacement of the fixed terminal by the floating terminal on the electrical connection performance, the electrical connection performance can be kept within an acceptable range, and the adjusted relative position relationship between the image sensor and the lens can be conveniently kept in the assembly process.

The utility model provides a camera module, which comprises a lens; a circuit board fixedly carrying the image sensor, the circuit board being fixedly connected with the lens; the shell, utilize the connector interconnect between circuit board and the shell, wherein, the connector is floating terminal.

In the assembling process, the circuit board and the lens are connected in a fixed mode, and the circuit board and the shell are connected by adopting the floating terminal to absorb tolerance, so that the stress for enabling the fixed connection between the circuit board carrying the image sensor and the lens to lose efficacy or shift is not easy to generate in the assembling process, the relative position between the image sensor and the lens can be effectively determined, the position of the image sensor can be kept on the main optical axis of the lens, and the imaging effect is improved. Meanwhile, as found in the process of the present invention, the effective absorption of the tolerance can compensate the influence of the replacement of the fixed terminal by the floating terminal on the electrical connection performance, and the electrical connection performance of the connector can be maintained within an acceptable range.

In the optional technical solution of the present invention, the floating terminal is a floating terminal movable in at least X, Y, Z three directions. The X, Y, Z floating terminal with three-way movement can absorb tolerance accumulation caused by assembling lens assembly and sensor patch, etc., and ensure optical axis precision and electrical performance after assembling.

The utility model discloses an among the optional technical scheme, the terminal that floats includes swing joint's plug terminal and socket terminal each other, wherein, plug terminal and casing fixed connection, socket terminal and circuit board fixed connection. Through the mode, in the assembling process, only the plug terminal and the shell are required to be fixedly connected, the socket terminal and the circuit board are fixedly connected, and then the assembling between the socket terminal and the plug terminal is completed.

The utility model discloses an among the optional technical scheme, it is fixed to bond between circuit board and the camera lens. Preferably, the circuit board and the lens are fixedly connected in a dispensing mode. The fixing method by adopting the bonding mode has the advantages that on one hand, the cost is low, on the other hand, the stress applied to the bonded two sides by the adhesive (such as glue) in the process from fluid or adhesive fluid to complete solidification is small, and therefore the position relation between the bonded circuit board and the lens can be maintained to be stable.

The utility model discloses an among the optional technical scheme, the camera lens has the face of bonding in the one end that is close to the circuit board for it is fixed with the circuit board bonding, the face of bonding is formed with a plurality of bulges and is located the concave yield between a plurality of bulges. Through the mode, the contact area of the bonding surface can be effectively increased, and the bonding effect between the circuit board and the lens is improved.

In the optional technical solution of the present invention, the casing and the lens are fixed to each other by a fusing ring. According to the above optional technical scheme, because the floating terminal is used for eliminating the size tolerance and the assembly tolerance, the influence caused by the tolerance is less transmitted between the lens and the shell, the optical axis deviation of the lens caused by assembly can be reduced, the size of the gap is reduced, and the phenomenon of glue leakage is avoided. By utilizing the fusing process, the air tightness of the module can be improved on the basis of not increasing the cost of sealing rubber pieces or other materials and the processing cost.

Further, the utility model discloses an among the optional technical scheme, the camera module is still including the lens cap that has the jack catch, the camera lens has the inner fringe portion to and from the outer fringe portion that the outer fringe portion outwards extends to the side an organic whole and form, the outer fringe portion is buckled and is formed with the cell body on extending direction, the first portion that is melting the ring is melting fixedly with the top end face of outer fringe portion, the second portion that is melting the ring shelters from partial cell body and forms and detain the position, the jack catch of lens cap gets into the cell body and utilize to detain the position and melt the ring joint fixed.

The melting ring is used for forming the buckling position, on one hand, the device is simpler, the buckling position structure does not need to be manufactured on other parts, and the requirement on the forming process of other parts can be reduced; on the other hand, the cell body that outer fringe portion formed can provide abundant confession jack catch and stretch into and accomplish the space of joint, improves the fixed degree of stability of lens cap joint.

The utility model discloses an among the optional technical scheme, the camera module is still including the lens cap that has the jack catch, and the camera lens has interior marginal part, and the lateral wall department of interior marginal part is formed with detains the position, and the jack catch of lens cap utilizes to detain the position fixed with the camera lens joint. According to this optional technical scheme, the lateral wall department through the inside edge portion forms the knot position, can reduce the quantity of the subassembly of required assembly, makes things convenient for batch automated production.

The utility model discloses an among the optional technical scheme, the circuit board still integrates the power return circuit that has the camera module. With power return circuit integration on the circuit board that carries on image sensor, can effectively reduce the volume of camera module, improve equipment integration.

The utility model discloses an among the optional technical scheme, the inner wall of casing to the mode of encircleing the circuit board, the cover is equipped with electromagnetic shield cover. Through above mode, utilize the electromagnetic shield cover who encircles the circuit board, can replace the integrated configuration of last shield cover, lower shield cover among the prior art, reduce the quantity of electromagnetic shield part, improve assembly efficiency.

The utility model discloses an among the optional technical scheme, the camera module is the built-in camera module of electronic equipment. According to the optional technical scheme, the production and assembly process of the built-in camera module has high precision requirement, and the tolerance of assembly errors generated in the assembly process is low, so that the effect of improving the electrical connection performance or the imaging performance of the built-in camera module is obvious.

Drawings

FIG. 1 is an exploded view of a camera module according to one embodiment;

FIG. 2 is a sectional view of an assembly structure of the camera module in the embodiment of FIG. 1;

FIG. 3 is a schematic view of a lens assembly of the camera module in the embodiment of FIG. 1;

FIG. 4 is a schematic structural view of a fixing claw of the lens barrel of FIG. 3;

FIG. 5 is a diagram illustrating an assembly relationship between a lens and a lens cover of the camera module according to an embodiment;

FIG. 6 is a schematic view of an assembly relationship between a lens and a lens cover of a camera module according to another embodiment;

fig. 7 is an exploded view of the camera module according to the embodiment of fig. 5.

Reference numerals: 1-a camera module; 11-a lens; 111-inner edge portion; 111 a-snap; 112-an outer rim portion; 113-a lens portion; 114-a bonding surface; 114 a-a projection; 114 b-a recess; 115-fixed jaw; 116-a trough body; 12-a circuit board; 121-an image sensor; 13-a housing; 131-a through hole; 14-a floating terminal; 14 a-socket terminals; 14 b-plug terminals; 15-fusion ring; 151-fastening position; 16-lens cover; 161-claw; 17-electromagnetic shield.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

The present embodiment provides a camera module 1, fig. 1 shows some components used in the camera module 1, and referring to fig. 1, the camera module 1 is formed by assembling components including, but not limited to, the following: the image pickup device includes a lens 11, a circuit board 12, and a housing 13, wherein an image sensor 121 is fixedly mounted on the circuit board 12. Referring to fig. 2, in the assembled state, the circuit board 12 is fixedly connected to the lens 11, and the circuit board 12 and the housing 13 are connected to each other by a connector, specifically, a floating terminal 14.

The camera module 1 of this kind of structure has following advantage in comparison with the camera module that adopts fixed terminal: if the fixed terminal is adopted, the dimensional tolerance and the assembly tolerance of partial products are large and cannot be absorbed, and the products are easily judged to be unqualified products due to serious electrical performance degradation or serious imaging performance degradation, so that the overall yield of the products is reduced.

In the camera module 1 provided by the embodiment, since the housing 13 and the circuit board 12 are configured to be connected by using the floating terminal 14, in the assembly process, the fixed connection between the circuit board 12 and the lens 11 can be firstly completed, so that the relative position between the image sensor 121 fixed to the circuit board 12 and the lens 11 is ensured to be stable, and the imaging performance of the camera module 1 is ensured; next, the circuit board 12 and the lens 11 fixed to each other are assembled with the housing 13 as a whole. Because the circuit board 12 is connected with the housing 13 by the floating terminal 14, the floating terminal 14 can effectively absorb dimensional tolerance and assembly tolerance, on one hand, in the process of assembling with the housing 13, the two tolerances will not or less stress the assembled structure, and the position between the image sensor 121 and the lens 11 is not easy to deviate, so that the imaging performance of a product with larger tolerance is not greatly influenced by the deviation of the position; on the other hand, since the tolerance is well absorbed, the electrical connection performance of the product with a large part tolerance is not seriously deteriorated.

Through the structure, the stress which makes the fixed connection between the circuit board 12 carrying the image sensor 121 and the lens 11 invalid or offset is not easy to generate in the assembling process, so that the relative position between the image sensor 12 and the lens 11 can be effectively determined, the position of the image sensor 12 can be kept on the main optical axis of the lens 11, and the imaging effect is improved. Meanwhile, as the inventor found in the process of the present invention, the effective absorption of the tolerance can compensate the influence of the replacement of the fixed terminal by the floating terminal 14 on the transmission performance of the high frequency signal, and the electrical connection performance of the connector can be maintained within an acceptable range. In addition, the dimensional tolerance and the assembly tolerance can be effectively absorbed, the integral imaging performance and the electrical connection performance of the product in the production line can be kept on a higher horizontal line, and the product yield is improved.

In some embodiments, floating terminal 14 is a floating terminal that is at least X, Y, Z three-way movable. Specifically, the X, Y, Z three-way movement means that the floating terminal 14 can move in three orthogonal directions (translational movement) between the plug terminal 14b and the receptacle terminal 14 a. The X, Y, Z floating terminal 14 with three-way movement can absorb tolerance accumulation caused by assembling lens assembly and sensor patch, etc., and ensure optical axis precision and electrical performance after assembling. In other embodiments, the floating terminal 14 may be a floating terminal 14 that is movable in one or two directions, such as a single direction of relative movement between the plug terminal 14b and the receptacle terminal 14a, or a planar relative movement. In other embodiments, the floating terminal 14 may also include a rotational dimension of freedom of movement or any other reasonable dimension of freedom of movement. Preferably, floating terminal 14 includes three translational degrees of freedom and three rotational degrees of freedom, and is a six-axis movable floating terminal 14 that is beneficial for matching the six-axis adjustment requirements during assembly.

In some embodiments, the floating terminal 14 includes a plug terminal 14b and a socket terminal 14a movably connected to each other, wherein the plug terminal 14b is fixedly connected to the housing 13, and the socket terminal 14a is fixedly connected to the circuit board 12. Through the above manner, in the assembly process, the plug terminal 14b is firstly fixedly connected with the shell 13 and the socket terminal 14a is fixedly connected with the circuit board 11, and then the assembly between the socket terminal 14a and the plug terminal 14b is completed, and due to the floating characteristic of the socket terminal 14a and the plug terminal 14b of the floating terminal 14, a certain deviation amount can be allowed in the butt joint process of the socket terminal 14a and the plug terminal 14b, so that the assembly efficiency can be improved, and the mass automatic production is facilitated.

Referring to fig. 2 and 3, in the present embodiment, the lens 11 includes an inner edge portion 111 for converging light rays and an outer edge portion 112 as a connecting, supporting structure, the inner edge portion 111 includes a lens portion 113 at the center of the lens 11, and the lens portion 113 is capable of converging external light rays toward the image sensor 121.

With continued reference to fig. 2, the outer rim portion 112 is disposed on a side of the inner rim portion 111 of the lens close to the housing 13 and is integrally formed with the inner rim portion 111, and in an assembled state, the inner rim portion 111 is partially exposed or partially covered by the lens cover 16, and the outer rim portion 112 is located inside the camera module 1 and is surrounded and covered by the housing 13.

In the present embodiment, the circuit board 12 is disposed inside the housing 13 in the assembled state, and is fixedly connected to the lens 11. Specifically, the circuit board 12 is a PCB board, and the image sensor 121 is disposed at a central position of a side of the PCB board close to the lens 11, on a main optical axis of the lens portion 113 of the lens 11, so as to ensure an imaging quality of the image sensor 121.

The main body portion of the housing 13 is disposed at the rear side of the camera module 1 and extends to the front side (lens side) of the camera module 1 to be connected with the lens 11. The housing 13 has a substantially groove shape and accommodates the lens 11, the circuit board 12, and the like. The groove-shaped housing 13 has a through hole 131 at the bottom center, and the through hole 131 is used for the floating terminal 14 connecting the housing 13 and the circuit board 12 to pass through, so as to facilitate the electrical connection between the floating terminal and the external circuit.

With continued reference to fig. 2, in some embodiments, the circuit board 12 is adhesively secured to the lens 11. Preferably, the circuit board 12 and the lens 11 are fixedly connected by dispensing. The fixing by adopting the bonding mode has lower cost on one hand, and on the other hand, the stress applied to the bonded two sides by the viscose (such as the glue used in the glue dispensing process) from the fluid or the viscose to the complete curing process is smaller, so that the stability of the position relationship between the bonded circuit board and the lens can be maintained.

Specifically, the lens 11 has a fixing claw 115 extending from the outer edge 112 toward the rear side of the camera module 1, and is fixed to the circuit board 12 by adhesion. The end surface of the fixing claw 115 close to the circuit board 12 is an adhesive surface 114.

Referring to fig. 4, in the present embodiment, the adhesive surface 114 of each of the fixing claws 115 includes two convex portions 114a and a concave portion 114b between the two convex portions 114 a. In this way, the surface area of the bonding surface 114 can be effectively increased, and the bonding effect between the circuit board 12 and the lens 11 can be improved. In some embodiments, the surface area of the bonding surface 114 may be increased by providing three or more staggered protrusions 114a and recesses 114b, and using an uneven structure.

Referring to fig. 5, in some embodiments, the housing 13 and the lens 11 are fixed to each other by a fusion ring 15. According to the above-mentioned optional technical solution, because the floating terminal 14 is used to eliminate the dimensional tolerance and the assembly tolerance, the influence caused by the above tolerance is less transmitted between the lens 11 and the housing 13, and the housing 13 and the lens 11 are fixed by the fusing ring 15, so that the optical axis deviation of the lens 11 caused by assembly can be reduced, and the glue leakage phenomenon generated in the bonding process can be avoided.

With continued reference to fig. 5, the camera module 1 further includes a lens cover 16 having a latch 161, the lens 11 has an inner edge portion 111 and an outer edge portion 112 integrally extending from the inner edge portion 111 to the outside, the outer edge portion 112 is bent in the extending direction to form a groove 116, a first portion of the fusion ring 15 (a portion of the fusion ring 15 on the outside in the radial direction in fig. 5) is fusion-fixed to the top end surface of the outer edge portion 112, a second portion of the fusion ring 15 (a portion of the fusion ring 15 on the inside in the radial direction in fig. 5) covers a portion of the groove 116 and forms a catch 151, and the latch 161 of the lens cover 16 enters the groove 116 and is catch-fixed to the fusion ring by the catch 151.

The melting ring 15 is used for forming the buckling position 151, on one hand, the structure of the buckling position 151 does not need to be manufactured on other parts, the device is simpler, and the requirements on the forming process of other parts can be reduced; on the other hand, the groove 116 formed by the outer edge 112 can provide a sufficient space for the claw 161 to extend into and complete the clamping, thereby improving the stability of the clamping fixation of the lens cover 16.

Referring to fig. 6, in some other embodiments, the camera module 1 further includes a lens cover 16 having a latch 161, the lens 11 has an inner edge portion 111, a catch 111a is formed at an outer side wall of the inner edge portion 111, and the latch of the lens cover 16 is fixed to the lens 11 by the catch 111 a. According to the optional technical scheme, the buckling positions 111a are formed on the outer side wall of the inner edge portion 111, so that the number of components required to be assembled can be reduced, and mass automatic production is facilitated.

In some embodiments, the circuit board 12 also integrates a power circuit (not shown) of the camera module 1. With power return circuit integration on the circuit board 12 who carries on image sensor 121, can effectively reduce camera module 1's volume, improve equipment integration.

Referring to fig. 7, in other embodiments, an electromagnetic shield 17 is provided around the inner wall of the housing 13 to surround the circuit board 12. Through the mode, the electromagnetic shielding cover 17 surrounding the circuit board 12 is utilized to replace the combined structure of the upper shielding cover and the lower shielding cover in the prior art, the number of electromagnetic shielding parts is reduced, and the assembly efficiency is improved. In some embodiments, electromagnetic shielding may also be performed by depositing a metal layer on the surface of the housing 13.

With continued reference to fig. 7, in some embodiments, a method of assembling the camera module 1 of fig. 7 is also disclosed, the method comprising, in order of assembly, the steps of:

a. fixing the fusion ring 15 and the lens 11 by using a laser welding process;

b. dispensing glue at the position corresponding to the bonding surface 114 on the circuit board 12;

c. the circuit board 12 is combined with the lens 11, when the glue is not cured, six-axis adjustment is carried out,

adjusting the definition of the camera;

d. after the definition of the camera is adjusted to the optimal state, the glue is subjected to UV surface curing,

and heating for further curing;

e. the cured lens 11-circuit board 12 integrated structure is inserted into the housing 13, and the fusion ring 15 is fixed to the housing 13 using a laser welding process.

According to this embodiment, with the help of the fusion ring 15, not only can utilize the laser welding process to accomplish the fixed of casing 13 and camera lens 11, still provide knot position 151 for the joint of lens lid 16, utilize simple device to realize multiple functions, reduced the part quantity, promoted assembly efficiency.

In other embodiments, the components may be fixed by ultrasonic welding or by screwing.

In some embodiments, the camera module 1 is a built-in camera module of an electronic device. Because the production assembly process of the built-in camera module has higher precision requirement and lower tolerance to assembly errors generated in the assembly process, the effect of improving the electrical connection performance or the imaging performance of the built-in camera module in the embodiment is obvious.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A camera module, comprising:

a lens;

a circuit board fixedly carrying an image sensor, the circuit board being fixedly connected to the lens;

a housing, the circuit board and the housing being connected to each other by a connector,

it is characterized in that the preparation method is characterized in that,

the connector is a floating terminal.

2. The camera module of claim 1, wherein said floating terminal is at least X, Y, Z three-way movable floating terminal.

3. The camera module according to claim 1 or 2, wherein the floating terminal comprises a plug terminal and a socket terminal movably connected to each other, wherein the plug terminal is fixedly connected to the housing, and the socket terminal is fixedly connected to the circuit board.

4. The camera module of claim 1, wherein the circuit board is adhesively secured to the lens.

5. The camera module of claim 4, wherein the lens has an adhesive surface at an end adjacent to the circuit board for adhesive attachment to the circuit board, the adhesive surface defining a plurality of protrusions and recesses therebetween.

6. The camera module of claim 1, wherein the housing and the lens are secured to each other by a fused ring.

7. The camera module of claim 6, further comprising a lens cover having a latch, wherein the lens has an inner edge portion and an outer edge portion integrally extending outward from the inner edge portion, the outer edge portion is bent in an extending direction to form a groove, a first portion of the fusion ring is fusion-fixed to a top end surface of the outer edge portion, a second portion of the fusion ring covers a portion of the groove and forms a catch, and the latch of the lens cover enters the groove and is snap-fixed to the fusion ring by the catch.

8. The camera module of claim 1 or 6,

the camera module is characterized in that the camera module further comprises a lens cover with a clamping jaw, the lens is provided with an inner edge part, a buckling position is formed at the outer side wall of the inner edge part, and the clamping jaw of the lens cover is utilized for buckling the position and fixedly clamping the lens.

9. The camera module of any one of claims 1, 2, 4-7, wherein the circuit board further integrates a power return of the camera module.

10. The camera module of claim 1, wherein an electromagnetic shield is disposed around the circuit board on an inner wall of the housing.