TWI412215B - Voice-coil motor and lens module using same - Google Patents

Abstract

This invention relates to a voice-coil motor. The voice-coil motor includes a fixed assembly, a movable assembly and an elastic member. At least a pair of opposite guide poles is set on the fixed assembly. The movable assembly provides at least a pair of through holes corresponding to the at least a pair of guide poles. Each guide pole runs through each through hole. The elastic member is fixed on the fixed assembly. A side of the elastic member far away from the fixed assembly extends at least a pair of opposite elastic arms with a free end. Each free end is fixed on the movable assembly. The motion precision of the movable assembly is improved because the movable assembly moves and is reset along the guide poles via the elastic member cooperating with the guide poles. This invention also relates to a lens module using the voice-coil motor.

Description

Voice coil motor and lens module using the voice coil motor

The present invention relates to a driving technology, and more particularly to a voice coil motor and a lens module using the voice coil motor.

At present, imaging devices such as cameras and mobile phone cameras are increasingly favored by consumers. Under the drive of high image quality, the lens module using the autofocus mode has become the mainstream in the world today. Generally, the autofocus device of the lens module uses a voice coil motor (Voice Coil Motor) to drive the lens to focus. Previous voice coil motors typically included a fixed assembly, a movable assembly, and two resilient members. The movable component drives the lens to move to focus, and the elastic component resets the movable component. However, the elastic component needs to be guided to reset the movable component, otherwise the movable component is easy to move relative to the fixed component during the moving process. Tilt, which affects the movement accuracy of the lens.

In view of the above, it is necessary to provide a voice coil motor capable of improving the movement accuracy of the lens and a lens module using the voice coil motor.

A voice coil motor includes a fixed assembly, a movable assembly and a resilient member. The fixing assembly includes a base, a magnet, and at least one pair of opposing guide posts. The at least one pair of guiding columns are disposed on the base, and the magnet is disposed with the At least one pair of guiding columns corresponding to the magnet perforations, the magnet is fixed on the base, and the at least one pair of guiding columns respectively pass through the corresponding magnet perforations. The movable component is provided with a perforation corresponding to the at least one pair of guiding columns, and the at least one pair of guiding columns respectively pass through the corresponding perforations. The elastic member is fixed on the magnet, and the elastic member extends away from one side of the fixing component to at least one pair of opposite elastic arms and respectively form a free end, and the at least one pair of free ends are respectively fixed on the movable component.

A lens module using the voice coil motor described above, the lens module further comprising a lens. The lens is attached to the active component.

Compared with the prior art, the voice coil motor and the lens module using the voice coil motor use the elastic member to cooperate with the guiding column to move or reset the movable component along the guiding column, thereby improving the activity. The movement accuracy of the component.

100‧‧‧ lens module

10‧‧‧ lens

20‧‧‧ voice coil motor

30‧‧‧Fixed components

40‧‧‧Active components

50‧‧‧Flexible components

60‧‧‧ Shell

31‧‧‧Base

32‧‧‧ Magnet

33‧‧‧ Guide column

321‧‧‧Magnetic perforation

41‧‧‧ coil

42‧‧‧Guidance

421‧‧‧Perforation

61‧‧‧Into the light hole

51‧‧‧Bounce arm

52‧‧‧ pin piercing

53‧‧‧ Positioning perforation

54‧‧‧Free end

422‧‧‧ Groove

423‧‧‧ pin

FIG. 1 is a perspective view of a lens module according to an embodiment of the present invention.

2 is an exploded perspective view of the lens module of FIG. 1.

3 is a schematic structural view of an elastic member of the lens module of FIG. 1.

4 is a schematic structural view of a guiding portion of the lens module of FIG. 1.

The following preferred embodiments will be described in detail below with reference to the accompanying drawings.

Please refer to FIG. 1 and FIG. 2 together to provide a lens module 100 according to an embodiment of the present invention. The lens module 100 includes a lens 10 and a voice coil motor 20. The voice coil motor 20 includes a fixing assembly 30, a movable assembly 40, an elastic member 50 and a Housing 60.

The fixing assembly 30 includes a base 31, a magnet 32, and at least one pair of opposing guide posts 33 disposed on the base 31. In the present embodiment, the number of the guiding posts 33 is a pair and symmetrically distributed on one diagonal of the base 31. The magnet 32 is provided with a magnet perforation 321 corresponding to the two guiding posts 33. The magnet 32 is fixed on the base 31, and the two guiding posts 33 respectively pass through the corresponding magnet perforations 321 . It can be understood that the two guiding posts 33 can also be fixedly disposed on the magnet 32.

The movable assembly 40 includes a coil 41 and a pair of guiding portions 42 corresponding to the two guiding posts 33. The two guiding portions 42 are fixed to the edges of the coil 41. Preferably, the two guiding portions 42 are fixed at both ends of the diameter line of the coil 41. The two guiding portions 42 are respectively provided with through holes 421 through which the two guiding posts 33 pass.

Referring to FIG. 1 to FIG. 4 together, in the embodiment, the elastic member 50 is a spring piece. The elastic member 50 is provided with two positioning through holes 53 corresponding to the two guiding columns 33. The two guiding posts 33 respectively pass through the corresponding positioning through holes 53 to assemble the elastic member 50 on the two guiding posts 33. The elastic member 50 is fixed to the magnet 32 by adhesive on one side of the base 31. It can be understood that the elastic member 50 may not be provided with the two positioning through holes 53 , and a gap is formed at a position where the elastic member 50 is in contact with the two guiding posts 33 , so that the elastic member 50 is directly fixed by the adhesive. On the magnet 32. The elastic member 50 extends away from one side of the base 31 to form at least one pair of elastic arms 51 and forms a free end 54. The free end 54 of the elastic arm 51 is provided with a pin through hole 52. In the present embodiment, the number of the elastic arms 51 is two. It can be understood that the elastic arms 51 and the elastic member 50 can have a split structure. The two guiding posts 33 are respectively passed through the corresponding through holes 421 to assemble the movable assembly 40 on the two guiding posts 33. The two A groove 422 is respectively disposed on one side of the guiding portion 42 near the base 31, and the two grooves 422 respectively correspond to the free ends 54 of the two elastic arms 51. A pair of pins 423 are respectively disposed in the two recesses 422, and the two pins 423 can respectively pass through the two pin through holes 52. When the movable component 40 is assembled on the elastic component 50, the two recesses 422 respectively receive the free ends 54 of the two elastic arms 51, and the two pins 423 respectively pass through the two pin perforations 52. . Ultrasonic welding of the two pins 423 causes the free ends 54 of the elastic members 50 to be closely bonded to the corresponding pins 423, respectively. It can be understood that the elastic member 50 may not be provided with the pin through hole 52. The two grooves 422 are correspondingly not provided with the pin 423. The free end 54 of the elastic member 50 is directly fixed in the groove 422 by adhesive. .

The lens 10 is housed in the coil 41 by an adhesive portion. Of course, if the height of the coil 41 is not less than the height of the lens 10, the coil 41 completely houses the lens 10. In order to facilitate the lightweight design of the lens module 100, the height design of the coil 41 is only related to the strength of the magnetic field generated. It can be understood that the lens 10 is in the form of a screwless tooth.

The housing 60 is disposed on the base 31 and houses the lens 10, the fixing component 30, the movable component 40 and the elastic component 50. The housing 60 is provided with a light entrance hole 61 having a diameter not less than the diameter of the lens 10. The length of the two guiding posts 33 is smaller than the height of the outer casing 60. In this embodiment, when the outer casing 60 is disposed on the base 31, the two guiding posts 33 are abutted against the outer casing 60 away from one end of the base 31.

After the coil 41 is energized, a magnetic field (not shown) is generated, and the magnetic field forms a magnetic pole repelling with a magnetic field (not shown) of the magnet 32 directly under the coil 41, so that the coil 41 generates a repulsive force opposite to the magnet 32. . The upward movement of the coil 41 drives the active group The member 40 moves upward along the two guiding posts 33. At this time, the elastic member 50 fixed to the two guiding portions 42 generates a pulling force, thereby controlling the movement precision of the movable assembly 40. When the coil 41 stops energizing, the magnetic field generated by the coil 41 disappears, and the elastic member 50 pulls the movable assembly 40 back to the original position to complete the reset function. Since the guide post 33 abuts against the outer casing 60 away from one end of the base 31, the movable assembly 40 does not disengage from the two guide posts 33 during the movement.

The lens module 100 of the embodiment of the present invention, the voice coil motor 20 cooperates with the guiding post 33 by the elastic component 50 to move or reset the movable component 40 along the guiding post 33. The arrangement avoids tilting of the movable assembly 40 relative to the stationary assembly 30, thereby increasing the accuracy of movement of the movable assembly 40. In addition, the arrangement of the guide post 33 enhances the strength of the voice coil motor 20 to be severely hit, reducing the possibility of the elastic member 50 being deformed by a heavy blow.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in light of the spirit of the present invention are It should be covered by the following patent application.

100‧‧‧ lens module

10‧‧‧ lens

20‧‧‧ voice coil motor

30‧‧‧Fixed components

40‧‧‧Active components

50‧‧‧Flexible components

60‧‧‧ Shell

31‧‧‧Base

32‧‧‧ Magnet

33‧‧‧ Guide column

321‧‧‧Magnetic perforation

41‧‧‧ coil

42‧‧‧Guidance

421‧‧‧Perforation

61‧‧‧Into the light hole

51‧‧‧Bounce arm

52‧‧‧ pin piercing

53‧‧‧ Positioning perforation

54‧‧‧Free end

Claims (10)

A voice coil motor comprising a fixing assembly, a movable assembly and an elastic member, wherein the fixing assembly comprises a base, a magnet and at least one pair of opposite guiding columns, the at least one pair of guiding columns being arranged On the base, the magnet is provided with a magnet perforation corresponding to the at least one pair of guiding columns, the magnet is fixed on the base, and the at least one pair of guiding columns respectively pass through the corresponding magnet perforations, The movable component is provided with a perforation corresponding to the at least one pair of guiding columns respectively passing through the corresponding perforations, the elastic element is fixed on the magnet, and the elastic component is away from the fixing component At least one pair of opposite elastic arms extend from one side and respectively form a free end, and the at least one pair of free ends are respectively fixed on the movable component. The voice coil motor of claim 1, wherein the movable assembly further comprises a coil and at least one pair of opposite guiding portions, the at least one pair of perforations being respectively disposed on the at least one pair of guiding portions, The at least one pair of guiding portions are fixed on an edge of the coil, and the at least one pair of free ends respectively correspond to the at least one pair of guiding portions and are respectively fixed on the corresponding guiding portions. The voice coil motor of claim 2, wherein the at least one pair of guiding portions are respectively provided with a groove near one side of the fixing component, and the at least one pair of free ends are respectively fixed and received at the at least one Inside a pair of grooves. The voice coil motor of claim 3, wherein the at least one pair of elastic arms and the elastic member are of a separate structure. The voice coil motor of claim 3, wherein the at least one pair is free The ends are respectively fixed by the adhesive and housed in the at least one pair of opposing grooves. The voice coil motor of claim 3, wherein the at least one pair of grooves are respectively provided with a pin, and the at least one pair of free ends are respectively provided with a pin perforation, the at least one pair of pins The through holes respectively correspond to the at least one pair of pins, the at least one pair of pins respectively passing through the corresponding pin perforations, and the at least one pair of pins are ultrasonically welded to respectively correspond to the at least one pair of free ends respectively The pins are tightly bonded. The voice coil motor of claim 2, wherein the elastic element is provided with a positioning through hole corresponding to the at least one pair of guiding columns, and the at least one pair of guiding columns respectively pass through the corresponding positioning perforation. The voice coil motor of claim 1, wherein the voice coil motor further comprises a casing, the casing is disposed on the fixing component and houses the fixing component, the movable component and the elastic component, the at least A pair of guiding posts are abutted against the outer casing away from one end of the fixing component. A lens module using a voice coil motor as in claim 1 of the patent application, the lens module further comprising a lens fixed to the movable component. The lens module of claim 9, wherein the coil of the movable component receives the lens by an adhesive portion.