TWI463238B - The magnet block structure of the auto focus module - Google Patents

Description

Magnet holder structure of autofocus module

The invention relates to a magnet holder structure of an autofocus module, and more particularly to a structure for enhancing the magnetic induction efficiency of a coil in a micro lens autofocus module.

Due to advances in technology, the size of digital cameras has been reduced considerably, and most of the current mobile phones have digital camera functions, which are attributed to the modularization and miniaturization of the camera lens. There are many types of autofocus drive structures. Currently, the most commonly used voice coil motor (VCM) is suitable for micro lens autofocus because of its small size, low power consumption, accurate motion displacement and low price. Short-range drive.

As shown in FIG. 1 , it is a perspective exploded view of a conventional auto-focus module. The conventional structure includes an outer frame cover 10 , a bottom cover 11 , and a lens carrier 12 . The lens holder 14 is embedded with a thread 15 and can be screwed into a lens 16. The lens carrier 12 can be covered with a coil 17 on the periphery of the lens carrier 12, and the lens carrier 12 can be supported by a spring piece 18 and a lower portion. The elastic piece 19 is supported at the center of the four magnets 14, so that it can move up and down to the center of the four magnets 14 in the outer frame cover 10, and the polarity of the magnetic field can be repelled or attracted by the magnet 14 by energizing the coil 17, thereby driving the lens bearing. Seat 12 and lens 16 are used for autofocus operation.

2 is a perspective view of the outer frame cover, the magnet and the coil of FIG. 1, wherein the four corners 20 in the outer frame cover 10 do not have the magnet 14 so that the electromagnetic field generated by the coil 17 is at the corner. 20 can not repulsion or attract with the magnet 14, forming a waste of electromagnetic field, and reducing the efficiency of the drive, so for the miniaturized auto-focus module, relatively power-consuming to achieve the purpose of driving.

Therefore, the above existing autofocus module still has room for improvement. Therefore, the inventor of the present invention has developed a magnet holder structure of an autofocus module, which extends from the top edge at each of the four corners of the metal frame cover. The stencil corresponds to the magnet between the two magnets to enhance the magnetic efficiency between the coil and the torsion damage caused by the screw into the lens.

The object of the present invention is to provide a magnet seat structure of an autofocus module, which can increase the magnetic field efficiency at a coil corner to improve the driving force of the coil electromagnetic field and achieve power saving.

In order to achieve the above object, the main technical feature of the present invention is to provide a magnet holder structure of an autofocus module, which comprises at least one outer frame, four magnets can be assembled at four inner portions thereof, and a lens can be assembled in a carrier. And assembling at least one elastic member in the outer frame, a coil can be assembled outside the carrier to drive the carrier to move up and down to focus, wherein each of the four corner positions of the outer frame is bent inward The splayed L-shaped plate extends between the coil and the carrier, and the space between the two magnets is adjacent to the coil to enhance the electromagnetic efficiency of the electromagnetic field driven by the coil at the corner.

In order to enable the reviewing committee to further understand the techniques, means, and effects of the present invention in order to achieve the intended purpose, refer to the following detailed description of the invention and the accompanying drawings. The invention is to be understood as being limited and not limited by the scope of the invention.

FIG. 3 is a perspective view showing a first embodiment of the present invention. FIG. 4 is a partial cross-sectional view showing a combination of components of the third embodiment of the present invention. The autofocus module of the present invention includes at least one outer frame. 30. A four-magnet 32, a carrier 34, at least one elastic member 36, a pad 37, and a coil 38. The outer frame 30 is square and is made of metal. The magnets can be assembled at the inner periphery of the frame. 32. The carrier 34 has a hollow shaft hole structure, and a lens 50 can be assembled in the shaft hole, and the elastic member 36 can be assembled in the outer frame 30.

The elastic member 36 includes an outer edge fixing portion and an inner edge movable portion, and the bearing seat 34 is connected to the inner edge movable portion of the elastic member 36, and the outer edge fixing portion of the elastic member 36 utilizes the cushion frame 37. It is connected to the outer frame 30, and a space for up and down movement is formed between the bolster 37 and the outer frame 30, so that the carrier 34 can be suspended and moved inside the outer frame 30.

The coil 38 has a square hollow ring shape and can be assembled outside the carrier seat 34. After being energized, an electromagnetic field can be generated, and the magnets 32 can be repelled or attracted to drive the carrier 34 up and down for automatic operation. The action of focusing.

An accommodating space 41 is formed between the four corners of the bearing block 34 and the coil 38. Preferably, the bearing block 34 is provided at the four corners with an inwardly retracting channel to form the accommodating space 41.

Wherein the four corner positions of the outer frame 30 are respectively provided with an L-shaped plate 40 bent inwardly from the top edge, and extending into the accommodating space 41 formed between the bearing seat 34 and the coil 38, and the L The stencil 40 just corresponds to the space formed between the two magnets 32 via the coil 38. Preferably, the L-shaped plate 40 is integrally formed with the outer frame 30, and the coil 38 can be reinforced at the corner edge. Electromagnetic field driven magnetic efficiency.

Moreover, since the L-shaped plate 40 extends into the accommodating space 41 of the carrier 34, the movable portion of the elastic member 36 can be prevented from being twisted and damaged when the lens 50 is screwed into the auto-focusing module. The board 40 also has the effect of protecting the horizontal torsion of the movable portion of the autofocus module.

According to the actual experimental results, the present invention can effectively enhance the magnetic field efficiency of the coil at the corner by 1.95 times by using the L-shaped plate at the corner of the outer frame disclosed above, thereby increasing the driving force of the electromagnetic field of the coil to achieve power saving. Efficacy, it can provide a design that is different from the well-known person, can improve the overall use value, and it has not been seen in the publication or public use before the application, Cheng has already met the requirements of the invention patent, and filed an invention patent application according to law.

However, the above-mentioned drawings and descriptions are only examples of the present invention, and those skilled in the art can make other various improvements according to the above description, and these changes still belong to the creative spirit of the present invention. The scope of the patents defined below.

10. . . Frame cover

11. . . Bottom cover

12. . . Lens carrier

14. . . magnet

15. . . Thread

16. . . Lens

17. . . Coil

18. . . Upper shrapnel

19. . . Lower shrapnel

20. . . corner

30. . . Outer frame

32. . . magnet

34. . . Carrier

36. . . Elastic part

37. . . Cushion

38. . . Coil

40. . . L-shaped board

41. . . Housing space

50. . . Lens

Figure 1 is a perspective exploded view of a conventional autofocus module.

Figure 2 is a perspective view of the outer frame cover, magnet and coil of Figure 1.

Figure 3 is a perspective view of a first embodiment of the present invention.

Figure 4 is a partial cross-sectional view of a portion of the components of Figure 3 of the present invention.

30‧‧‧Front frame

32‧‧‧ magnet

34‧‧‧Hosting

36‧‧‧Flexible parts

37‧‧‧Cushing frame

38‧‧‧ coil

40‧‧‧L-shaped board

41‧‧‧ accommodating space

50‧‧‧ lens

Claims (3)

A magnet seat structure of an autofocus module, the autofocus module includes at least: an outer frame, which is made of a metal material, and four magnets can be assembled at four inner portions thereof; and a bearing seat is a hollow shaft hole structure. A lens can be assembled in the shaft hole, and at least one elastic member can be assembled in the outer frame; and a coil can be assembled outside the carrier to generate an electromagnetic field to repel or attract the magnets. Focusing on driving the carrier up and down to focus; wherein, at the four corner positions of the top edge of the frame, an L-shaped plate bent inwardly extends between the coil and the carrier, and is separated The coil corresponds to the space between the two magnets. The magnet holder structure of the autofocus module according to claim 1, wherein an accommodating space is formed between the corners of the carrier and the coils for receiving the L-shaped board. The magnet holder structure of the autofocus module according to claim 1, wherein the L-shaped board is integrally formed with the outer frame.