TWI859615B - Lens module and method for manufacturing the lens module - Google Patents

Abstract

A lens module includes a frame, two supporting frames, two first elastic pieces, a plurality of second elastic pieces, a first circuit board, a second circuit board, an image sensor, two first coils, and two second coils, two first magnets, two second magnets, and a lens. The first elastic pieces are connected with the first circuit board and the image sensor, and can move in a first direction under the interaction between the first coils and the first magnets. The supporting frame, the second elastic pieces, the first circuit board, and the image sensor can move in a second direction under the interaction of the second coils and the second magnets. Therefore, the image sensor can move in the first direction and the second direction relative to the lens fixed on the frame, so as to realize the anti-shake function of the lens module. The present disclosure further provides a method for manufacturing the lens module.

Description

Lens module and method for manufacturing lens module

This application relates to the field of lens module anti-shake technology, and in particular to a lens module and a method for manufacturing the lens module.

In order to improve the imaging quality of the lens module, the lens module usually has an optical image stabilization function. Based on the electromagnetic principle, the current is controlled by the coil to generate different thrusts to push the lens to move and achieve optical image stabilization. As the lens increases in size and the number of components increases, the weight of the lens also increases, resulting in a decrease in the image stabilization sensitivity of the lens module.

A lens module includes a frame, two support frames, two first springs, a plurality of second springs, a first circuit board, a second circuit board, an image sensor, two first coils, two second coils, two first magnets, two second magnets, and a lens. The two support frames extend along a first direction; the two first springs extend along a second direction, each first spring is arranged with a spacing between each support frame, the two first springs and the two support frames are arranged in a ring shape, the first springs can be deformed along the first direction; each second spring is respectively connected to the frame and the support frame, the second springs can be deformed along the second direction; the first circuit board is connected to the two first springs; the second circuit board is connected to the first circuit board; the image sensor is fixed to the first circuit board; A circuit board; two first coils are arranged at intervals along a first direction and are fixed to the first circuit board respectively; two second coils are arranged at intervals along a second direction and are fixed to the second circuit board respectively; two first magnets are fixed to the frame respectively and are arranged at intervals corresponding to each first coil; two second magnets are fixed to the frame respectively and are arranged at intervals corresponding to each second coil; a lens is fixed to the frame and is arranged at intervals from the image sensor.

In some embodiments of the present application, the first circuit board includes a first connecting portion and two second connecting portions, and the two second connecting portions are arranged on both sides of the first connecting portion along the first direction; the image sensor is fixed on the first connecting portion, and the first coil is fixed on the second connecting portion.

In some embodiments of the present application, the second circuit board includes a third connecting portion and two fourth connecting portions, the third connecting portion is fixed to the frame, one end of each fourth connecting portion is connected to the third connecting portion, and the other end is connected to the second coil.

In some embodiments of the present application, the second circuit board further includes two fifth connecting parts, one end of the two fifth connecting parts is connected to the fourth connecting part, and the other end is connected to the same second connecting part.

In some embodiments of the present application, the lens module also includes a plurality of reinforcing plates, and the reinforcing plates are all arranged at the corners where the first spring plate is connected to the support frame.

In some embodiments of the present application, the first circuit board is a flexible circuit board, and the lens module further includes a reinforcement board, which is disposed on the surface of the first circuit board.

In some embodiments of the present application, the reinforcing plate is fixedly connected to the reinforcing sheet.

In some embodiments of the present application, the support frame has a greater bending resistance than the first elastic sheet and the second elastic sheet.

A method for manufacturing a lens module includes the following steps: providing a first circuit board and a second circuit board, electrically connecting the second circuit board to the first circuit board; fixing an image sensor on the first circuit board; arranging two first coils at intervals along a first direction and connecting them to the first circuit board respectively, and arranging two second coils at intervals along a second direction and connecting them to the second circuit board respectively; providing two first springs and two support frames, the two support frames extending along the first direction and being arranged at intervals, and the two first springs extending along the second direction. Extending in the direction and arranged at intervals, two support frames and two first elastic sheets are arranged in a ring shape; providing a frame and a plurality of second elastic sheets, fixing each second elastic sheet on the frame, and connecting the second elastic sheet to the support frame; connecting the first circuit board to the first elastic sheet; fixing two first magnets and two second magnets on the frame, each first magnet is arranged at intervals corresponding to each first coil, and each second magnet is arranged at intervals corresponding to each second coil; fixing a lens on the frame, and the lens is arranged at intervals from the image sensor.

In some embodiments of the present application, the manufacturing method further includes: attaching a reinforcing plate to the surface of the first circuit board; and setting a reinforcing plate at the corner where the first elastic sheet is connected to the support frame.

The lens module provided in the embodiment of the present application fixes the lens with a heavier weight on the frame, and the image sensor with a lighter weight moves relative to the lens, thereby realizing the anti-shake function, and the anti-shake performance is more agile.

100: Lens module

10: Framework

11: Side wall

20: Support frame

25: The first shrapnel

30: Second shrapnel

40: First circuit board

41: First connection part

43: Second connection part

50: Second circuit board

51: Third connection part

511:Through hole

53: Fourth connection part

55: Fifth connection part

57: Sixth connection part

61: First coil

63: Second coil

65: The first magnet

67: Second magnet

70: Image sensor

80: Lens

90: Reinforcement board

95: Tonic tablets

X: First direction

Y: Second direction

Z: Third direction

Figure 1 is a cross-sectional schematic diagram of the lens module provided in the embodiment of this application.

Figure 2 is a top view schematic diagram of a lens module with the lens omitted provided in the embodiment of the present application.

Figure 3 is a schematic plan view of the first circuit board provided in the embodiment of this application.

Figure 4 is a three-dimensional schematic diagram of the first circuit board in Figure 3 after folding.

Figure 5 is a schematic plan view of the second circuit board provided in the embodiment of this application.

Figure 6 is a three-dimensional schematic diagram of the second circuit board in Figure 5 after folding.

FIG. 7 is a three-dimensional schematic diagram of the first circuit board shown in FIG. 4 connected to the second circuit board shown in FIG. 6 .

Figure 8 is a schematic diagram of the structure in which the first elastic sheet and the support frame are arranged in a ring shape according to the embodiment of this application.

FIG9 is a schematic diagram of a structure in which a frame is arranged on the outer side of the structure shown in FIG8 and a second elastic sheet is connected to the frame.

In order to more clearly understand the above-mentioned purpose, features and advantages of this application, the following is a detailed description of this application in conjunction with the attached drawings and specific implementation methods. It should be noted that the implementation methods of this application and the features in the implementation methods can be combined with each other without conflict. In the following description, many specific details are explained to facilitate a full understanding of this application. The implementation methods described are only part of the implementation methods of this application, not all of the implementation methods.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application. The terms used in the specification of this article are only for the purpose of describing specific implementation methods and are not intended to limit this application. The term "and/or" used in this article includes all and any combinations of one or more related listed items.

In the various embodiments of this application, for the convenience of description rather than limitation of this application, the term "connection" used in the patent application specification and the scope of the patent application is not limited to physical or mechanical connection, whether direct or indirect. "Up", "down", "above", "below", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship also changes accordingly.

Referring to FIG. 1 and FIG. 2 , the present application embodiment provides a lens module 100 having an anti-shake function. The lens module 100 includes a frame 10, two support frames 20, two first springs 25, a plurality of second springs 30, a first circuit board 40, a second circuit board 50, an image sensor 70, two first coils 61, two second coils 63, two first magnets 65, two second magnets 67, and a lens 80. The first spring 25 is connected to the first circuit board 40 and the image sensor 70, and can move along the first direction X under the interaction between the first coil 61 and the first magnet 65; the support frame 20 and the second spring 30 and the first circuit board 40 and the image sensor 70 can move along the second direction Y under the interaction between the second coil 63 and the second magnet 67, so that the image sensor 70 can move along the first direction X and the second direction Y relative to the lens 80 fixed on the frame 10, realizing the anti-shake function of the lens module 100.

The frame 10 includes four side walls 11, which are arranged in a square shape. Two side walls 11 extend along a first direction X, and two side walls 11 extend along a second direction Y. The first direction X is perpendicular to the second direction Y.

The two support frames 20 extend along the first direction X and are spaced apart, the two first elastic sheets 25 extend along the second direction Y and are spaced apart, the two support frames 20 and the two first elastic sheets 25 are arranged in a ring shape, and the ring shape formed by the two support frames 20 and the two first elastic sheets 25 is built into the frame 10 and spaced apart from the frame 10. When the lens module 100 does not activate the anti-shake function, the two support frames 20 and the two first elastic sheets 25 are roughly arranged in a square; when the lens module 100 activates the anti-shake function, the two support frames 20 and the two first elastic sheets 25 are deformed to a certain extent and become an irregular ring shape. The first elastic sheet 25 can be deformed along the first direction X, so as to realize the anti-shake function of the lens module 100 in the first direction X.

In this embodiment, the number of the second elastic sheet 30 is two, which is not limited in other embodiments, and at least two is sufficient. Both ends of each second elastic sheet 30 are connected to the support frame 20, and the middle part of the second elastic sheet 30 is connected to the side wall 11. The second elastic sheet 30 can be deformed along the second direction Y. The second elastic sheet 30 cooperates with the support frame 20 to realize the anti-shake function of the lens module 100 in the second direction Y.

The first spring piece 25 and the second spring piece 30 both have high resilience and high fatigue resistance. The material of the first spring piece 25 and the second spring piece 30 can be metal or metal alloy. In a specific embodiment, the material of the first spring piece 25 is TiCu alloy. The support frame 20 has a higher bending resistance than the first elastic sheet 25 and the second elastic sheet 30, that is, when the lens module 100 realizes the anti-shake function in the second direction Y, it is mainly realized by the deformation of the second elastic sheet 30, and the support frame 20 only produces a smaller bending deformation. The material of the support frame 20 can be the same as that of the first elastic sheet 25 and the second elastic sheet 30. For example, the thickness of the support frame 20 can be increased, and carbon, cobalt, nickel and other materials can be added to the material of the support frame 20 to increase the strength of the support frame 20. The width of the support frame 20 can also be increased so that the width of the support frame 20 is greater than the bending resistance of the first elastic sheet 25.

The first circuit board 40 includes a first connecting portion 41 and two second connecting portions 43. The two second connecting portions 43 are arranged on both sides of the first connecting portion 41 along the first direction X and extend along the third direction Z relative to the first connecting portion 41. In this embodiment, the third direction Z is perpendicular to the first direction X and the second direction Y. In other embodiments, the second connecting portion 43 is not limited to being perpendicular to the first connecting portion 41.

The image sensor 70 is fixed on the first connection part 41. The image sensor 70 can be directly fixedly connected to the first connection part 41, or the image sensor 70 can be packaged with an IC carrier or a ceramic substrate and then fixed on the first connection part 41. The lens 80 is fixed on the frame 10 and is spaced apart from the image sensor 70.

Each second connection part 43 is connected to the first elastic sheet 25, and each first coil 61 is fixedly connected to each second connection part 43 and electrically connected to each other. Two first magnets 65 are arranged at intervals along the first direction X and fixed to the side wall 11 respectively. Each first coil 61 is arranged at intervals along the first direction X and corresponds to each other. The first coil 61 is located in the magnetic field generated by the first magnet 65.

Each second coil 63 is connected to each support frame 20, and two second coils 63 are arranged at intervals along the second direction Y; two second magnets 67 are arranged at intervals along the second direction Y and are fixed on the side wall 11 respectively, and each second coil 63 and each second magnet 67 are arranged at intervals along the second direction Y and correspond to each other, and the second coil 63 is located in the magnetic field generated by the second magnet 67.

The second circuit board 50 is connected to the first circuit board 40. The second circuit board 50 is a flexible circuit board so that when the lens module 100 realizes the anti-shake function, the movement of the first circuit board 40 is not restricted by the second circuit board 50. The second circuit board 50 includes a third connecting portion 51, two fourth connecting portions 53, two fifth connecting portions 55 and a sixth connecting portion 57. The third connecting portion 51 is arranged on the surface of the second elastic sheet 30 connected to the side wall 11. The third connecting portion 51 and one of the first magnets 65 are located on the same surface of the side wall 11. A through hole 511 is arranged on the third connecting portion 51 to facilitate the first magnet 65 to pass through. Two fourth connecting parts 53 are respectively arranged on both sides of the third connecting part 51. Both fourth connecting parts 53 are bent. Each fourth connecting part 53 extends from one side of the third connecting part 51 along the surface of the second elastic sheet 30 and the support frame 20 to the second coil 63, that is, the fourth connecting part 53 is connected to the second coil 63. Each fifth connecting part 55 is connected to each fourth connecting part 53, and the other end of each fifth connecting part 55 is connected to the same second connecting part 43 to realize the electrical connection between the second circuit board 50 and the first circuit board 40. The sixth connecting part 57 is connected to the third connecting part 51 and extends outward. The sixth connecting part 57 is used to be electrically connected to an external circuit.

When the first coil 61 is energized, the first coil 61 moves along the first direction X after being subjected to the Lorentz magnetic force in the magnetic field generated by the first magnet 65. The first coil 61 and the first circuit board 40 connected to the first coil 61 have a tendency to move along the first direction X. The first spring 25 is deformed along the first direction X by the force, thereby driving the first coil 61, the first circuit board 40 and the image sensor 70 disposed on the first connecting portion 41 to move relative to the lens 80 along the first direction X. When the first coil 61 is de-energized, the first coil 61 loses the effect of the Lorentz magnetic force, the first spring 25 returns to its initial state, and drives the components directly or indirectly connected to the first spring 25 to return to their initial state. When the second coil 63 is powered, the second coil 63 moves along the second direction Y under the Lorentz magnetic force in the magnetic field generated by the second magnetophoresis, and the support frame 20 connected to the second coil 63 has a tendency to move along the second direction Y. The second elastic sheet 30 is deformed along the second direction Y under the force, thereby driving the support frame 20, the second coil 63, the first elastic sheet 25 connected to the support frame 20, the first circuit board 40 connected to the first elastic sheet 25, and the image sensor 70 connected to the first circuit board 40 to move relative to the lens 80 along the second direction Y; when the second coil 63 is powered off, the second coil 63 loses the effect of the Lorentz magnetic force, the second elastic sheet 30 returns to its initial state, and drives the components directly or indirectly connected to the second elastic sheet 30 to return to their initial state.

The second spring 30 not only cooperates with the support frame 20 to realize the anti-shake function of the lens module 100 along the second direction Y, but also has the function of suspending the support frame 20, the first spring 25, the first circuit board 40 and the image sensor 70 relative to the frame 10. The support frame 20 has a higher bending resistance than the second spring 30. In the process of realizing the anti-shake function of the lens module 100 along the second direction Y, the support frame 20 can push the second coil 63, the first spring 25 connected to the support frame 20, the first circuit board 40 connected to the first spring 25, and the image sensor 70 connected to the first circuit board 40 to move along the second direction Y relative to the lens 80.

In some embodiments, the lens module 100 further includes a plurality of reinforcing sheets 95, which are all disposed at the corners where the first elastic sheet 25 and the support frame 20 are connected. The reinforcing sheets 95 are used to compensate for the strength of the corners where the first elastic sheet 25 and the support frame 20 are connected, so that the angle between the first elastic sheet 25 and the support frame 20 is a right angle, preventing the angle of the first circuit board 40 from changing during movement, so that the movement of the component is easier to control.

In some embodiments, the reinforcing sheet 95 is fixedly connected to the reinforcing plate 90. The reinforcing sheet 95 and the reinforcing plate 90 can be processed into an integral structure by special-shaped cutting, or can be mounted separately, which is conducive to improving the consistency of movement of various parts of the first circuit board 40. In some embodiments, the first coil 61 can be an integral structure with the first circuit board 40, or the first coil 61 can be welded to the first circuit board 40 by welding; the second coil 63 can be an integral structure with the second circuit board 50, or the second coil 63 can be welded to the second circuit board 50 by welding.

The first circuit board 40 can be a flexible circuit board, a rigid circuit board, an RF (Radio Frequency) circuit board, etc. When the first circuit board 40 is a flexible circuit board, the lens module 100 further includes a reinforcement board 90, which is disposed on the surface of the first circuit board 40 to enhance the rigidity of the first circuit board 40.

Please refer to Figures 3 to 9, and in combination with Figures 1 and 2, the present application embodiment also provides a method for manufacturing a lens module 100, which may include the following steps:

Step S1: Please refer to Figures 3 and 4, provide a first circuit board 40, fold the first circuit board 40 shown in Figure 3 along the dotted line position to obtain the first circuit board 40 shown in Figure 4.

The first circuit board 40 includes a first connecting portion 41 and two second connecting portions 43. The two second connecting portions 43 are arranged on both sides of the first connecting portion 41 along the first direction X and extend along the third direction Z relative to the first connecting portion 41.

Step S2: Please refer to Figures 5 and 6, provide a second circuit board 50, fold the second circuit board 50 shown in Figure 4 along the dotted line position to obtain the second circuit board 50 shown in Figure 6.

The second circuit board 50 includes a third connection part 51, two fourth connection parts 53, two fifth connection parts 55 and a sixth connection part 57. The two fourth connection parts 53 are respectively arranged on both sides of the third connection part 51, and the two fourth connection parts 53 are bent. Each fifth connection part 55 is connected to each fourth connection part 53, and the other end of each fifth connection part 55 is connected to the same second connection part 43, so as to realize the electrical connection between the second circuit board 50 and the first circuit board 40. The sixth connection part 57 is connected to the third connection part 51 and extends outward. The sixth connection part 57 is used to be electrically connected to an external circuit.

The second circuit board 50 is a flexible circuit board so that when the lens module 100 manufactured later realizes the anti-shake function, the movement of the first circuit board 40 is not restricted by the second circuit board 50.

Step S3: Please refer to Figure 7 to electrically connect the second circuit board 50 to the first circuit board 40. One end of each fifth connecting portion 55 is connected to the same second connecting portion 43.

Step S4: Please refer to Figure 7, and in combination with Figures 1 and 2, fix the image sensor 70 on the first connecting portion 41, fix the first coil 61 on the second connecting portion 43, and fix the second coil 63 on the fourth connecting portion 53.

Step S5: Please refer to Figure 8, and in combination with Figures 1 and 2, provide two first elastic sheets 25 and two support frames 20, the two support frames 20 extend along the first direction X and are spaced apart, the two first elastic sheets 25 extend along the second direction Y and are spaced apart, and the two support frames 20 and the two first elastic sheets 25 are arranged in a ring shape.

Step S6: Please refer to Figure 9, and in combination with Figures 1 and 2, provide a frame 10 and two second elastic sheets 30, fix the middle part of the second elastic sheet 30 on the frame 10, place the ring structure formed by the first elastic sheet 25 and the support frame 20 in the frame 10, and connect the ends of the two second elastic sheets 30 to the support frame 20.

Step S7: Please refer to Figure 1 and Figure 2 to fix the second connecting portion 43 on the first elastic sheet 25.

Step S8: Please refer to Figures 1 and 2 to fix two first magnets 65 and two second magnets 67 on the frame 10. The two first magnets 65 are arranged at intervals along the first direction X and are fixed to the frame 10 , each first coil 61 and each first magnet 65 are arranged at intervals along the first direction X and correspond to each other, and the first coil 61 is located in the magnetic field generated by the first magnet 65; the two second coils 63 are arranged at intervals along the second direction Y; the two second magnets 67 are arranged at intervals along the second direction Y and are fixed to the side wall 11, each second coil 63 and each second magnet 67 are arranged at intervals along the second direction Y and correspond to each other, and the second coil 63 is located in the magnetic field generated by the second magnet 67.

Step S9: Please refer to Figures 1 and 2 to fix a lens 80 on the frame 10. The lens 80 and the image sensor 70 are spaced apart along the third direction Z.

In some embodiments, when the first circuit board 40 is a flexible circuit board, the manufacturing method further includes the step of providing a reinforcing plate 90 on the surface of the first circuit board 40.

In some embodiments, the manufacturing method further includes the step of providing a reinforcing sheet 95 at the corner where the first elastic sheet 25 is connected to the support frame 20.

The lens module 100 provided in the embodiment of the present application fixes the lens 80 with a heavier weight on the frame 10, and the image sensor 70 with a lighter weight moves relative to the lens 80, thereby realizing the anti-shake function, and the anti-shake performance is more agile.

The above implementations are only used to illustrate the technical solution of this application and are not intended to limit it. Although this application is described in detail with reference to the above preferred implementations, ordinary technicians in this field should understand that the technical solution of this application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of this application.

11: Side wall

20: Support frame

25: The first shrapnel

30: Second shrapnel

40: First circuit board

41: First connection part

43: Second connection part

50: Second circuit board

51: Third connection part

53: Fourth connection part

55: Fifth connection part

57: Sixth connection part

61: First coil

63: Second coil

65: The first magnet

67: Second magnet

70: Image sensor

95: Tonic tablets

X: First direction

Y: Second direction

Claims (10)

A lens module, the improvement of which is that the lens module comprises: a frame; two support frames extending along a first direction; two first elastic sheets extending along a second direction, each of the first elastic sheets being arranged at intervals with each of the support frames, the two first elastic sheets and the two support frames being arranged in a ring shape, the first elastic sheets being able to generate deformation along the first direction; a plurality of second elastic sheets, each of the second elastic sheets being connected to the frame and the support frames respectively, the second elastic sheets being able to generate deformation along the second direction; a first circuit board connected to the two first elastic sheets; a second circuit board connected to the first circuit board; an image sensor fixed to the first circuit board; two first coils being arranged at intervals along the first direction and fixed to the first circuit board respectively ; two second coils, spaced along the second direction and fixed on the second circuit board; two first magnets, fixed on the frame and spaced corresponding to each first coil; two second magnets, fixed on the frame and spaced corresponding to each second coil; and a lens, fixed on the frame and spaced from the image sensor; wherein the interaction between the first coil and the first magnet is used to drive the first spring, the first circuit board and the image sensor to move along the first direction; the second coil interacts with the second magnet to drive the support frame, the second spring, the first circuit board and the image sensor to move along the second direction. The lens module as described in claim 1, wherein the first circuit board includes a first connecting portion and two second connecting portions, and the two second connecting portions are arranged on both sides of the first connecting portion along the first direction; the image sensor is fixed on the first connecting portion, and the first coil is fixed on the second connecting portion. The lens module as described in claim 2, wherein the second circuit board includes a third connecting portion and two fourth connecting portions, the third connecting portion is fixed to the frame, one end of each of the fourth connecting portions is connected to the third connecting portion, and the other end is connected to the second coil. The lens module as described in claim 3, wherein the second circuit board further includes two fifth connecting parts, one end of the two fifth connecting parts is connected to the fourth connecting part, and the other end is connected to the same second connecting part. The lens module as described in claim 1, wherein the lens module further includes a plurality of reinforcing plates, and the reinforcing plates are all arranged at the corners where the first elastic plate is connected to the support frame. The lens module as described in claim 5, wherein the first circuit board is a flexible circuit board, and the lens module further includes a reinforcement board, and the reinforcement board is arranged on the surface of the first circuit board. The lens module as described in claim 6, wherein the reinforcing plate is fixedly connected to the reinforcing sheet. The lens module as described in claim 1, wherein the bending resistance of the support frame is greater than the bending resistance of the first elastic sheet and the second elastic sheet. A method for manufacturing a lens module, the improvement of which is that it includes the following steps: providing a first circuit board and a second circuit board, electrically connecting the second circuit board to the first circuit board; fixing the image sensor on the first circuit board; arranging two first coils at intervals along a first direction and connecting them to the first circuit board respectively, and arranging two second coils at intervals along a second direction and connecting them to the two circuit boards respectively; providing two first springs and two support frames, the two support frames extending along the first direction and arranged at intervals, the two first springs extending along the second direction and arranged at intervals, the two support frames and the two first springs forming a ring; providing a frame and a plurality of second springs, fixing each of the second springs on the frame, and the second springs The support frame is connected with a sheet; the first circuit board is connected with the first elastic sheet; two first magnets and two second magnets are fixed on the frame, each of the first magnets is arranged at a corresponding interval with each of the first coils, and each of the second magnets is arranged at a corresponding interval with each of the second coils; and a lens is fixed on the frame, and the lens is arranged at a distance from the image sensor; wherein the interaction between the first coil and the first magnet is used to drive the first elastic sheet, the first circuit board and the image sensor to move along the first direction; the interaction between the second coil and the second magnet is used to drive the support frame, the second elastic sheet, the first circuit board and the image sensor to move along the second direction. The manufacturing method of the lens module as described in claim 9, wherein the manufacturing method further comprises: attaching a reinforcing plate to the surface of the first circuit board; and providing a reinforcing plate at the corner where the first elastic sheet is connected to the support frame.

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