TWI453488B - Lens module - Google Patents

Description

Lens module

The invention relates to a lens module.

For the lens module on the mobile phone, in order to prevent the occurrence of electromagnetic interference, the metal coating is usually performed on the mirror base by physical vapor deposition (PVD) sputtering. In this process, due to the change of the process temperature and the thickness of the metal plating film, the size of the part of the screw after the injection molding is increased, so that the torque of the lens holder screw changes. However, during the molding process, the screw of the corresponding lens barrel cannot be adjusted according to the change of the screw of the lens holder and the thickness of the metal coating, so that the torque between the lens barrel and the lens holder is screwed together. Coordination is difficult to control.

Moreover, the torque between the assembled lens barrel and the lens holder also needs to be controlled within a certain range so that the lens barrel and the mirror holder are better matched. Otherwise, if the torque is too large, the external thread of the lens barrel and the internal thread of the lens holder may wear each other. On the other hand, if the torque is too small, the lens barrel is easily separated from the lens holder, and the product yield is lowered.

In view of this, it is necessary to provide a lens module that can be better matched.

A lens module includes a lens holder and a set of lens barrels disposed in the lens holder. The lens holder is formed with internal threads of different heights around its inner side wall, and the barrel is formed with external threads corresponding to the internal threads around its outer side wall. The external thread includes a first screw segment and a second screw segment that are continuously disposed, and all the tooth phases of the first screw segment Etc., all the teeth of the second thread segment are equal, and the tooth height of the first screw segment is smaller than the tooth height of the second screw segment. When the lens barrel is screwed into the lens holder, the first screw segment enters the lens holder first than the second screw segment. All of the teeth of the first thread segment are equal to the smallest tooth height in the lens holder, and all of the tooth heights of the second thread segment are equal to the maximum tooth height in the lens holder. The lens module is an autofocus lens module, and a focus portion is preset on the lens holder, and the focus is at a boundary between the first screw segment and the second screw segment.

Compared with the prior art, the lens module of the present invention uses the first screw segment and the second screw segment with different tooth heights on the lens barrel, so that when the lens barrel is screwed with the lens holder, the lens module is used. The first half of the lens barrel can be screwed into the lens holder or unscrewed from the lens holder without much effort. In addition, since the difference between the tooth height of the first screw segment and the second screw segment is small, the torque is not greatly increased, and the external thread of the lens barrel and the lens holder are reduced due to the torque being too large. The degree to which threads are worn against each other. At the same time, since the second screw segment has a large tooth diameter, the locking force can be increased when screwed into the lens holder.

100, 100a‧‧‧ lens module

10, 10a‧‧ ‧ mirror base

11, 11a‧‧‧ internal thread

20, 20a‧‧ ‧ tube

21‧‧‧Upper edge

22‧‧‧ Lower edge

23, 23a‧‧‧ external thread

231, 231a‧‧‧ first screw segment

232, 232a‧‧‧second screw segment

24‧‧‧Focus

30‧‧‧Mirror cover

1 is a cross-sectional view of a lens module according to a first embodiment of the present invention; FIG. 2 is a cross-sectional view of a lens module of the second embodiment of the present invention; 4 is an enlarged view of a portion V of the lens module of FIG. 3.

The invention will be further described in detail below with reference to the accompanying drawings.

First embodiment

Please refer to FIG. 1 and FIG. 2 , which is a lens module 100 according to a first embodiment of the present invention. The lens module 100 includes a lens holder 10 and a lens barrel 20 disposed in the lens holder 10 . this In the embodiment, the lens holder 10 and the lens barrel 20 are both cylindrical.

The mirror base 10 is formed with a continuously disposed internal thread 11 around its inner side wall, and the internal thread 11 includes a plurality of threaded teeth. In the embodiment, the lens module 100 is a small lens module used in a mobile phone. In order to prevent the occurrence of electromagnetic interference, the surface of the plurality of screws of the lens holder 10 is sputtered with an electromagnetic interference protection layer. Since the temperature of the lens holder 10 changes during the sputtering process, the internal thread 11 on the lens holder 10 has a different tooth height.

The lens barrel 20 includes an upper edge 21 and a lower edge 22 opposite to the upper edge 21, the upper edge 21 being fixedly coupled to a lens barrel cover 30, the lower edge 22 being opposite to the lens holder 10, when the lens barrel 20 When the lens holder 10 is screwed to each other, the lower edge 22 first enters the lens holder 10. The barrel 20 is formed with an external thread 23 around its outer side wall corresponding to the internal thread 11, which extends uniformly and continuously from the lower edge 22 to the upper edge 21.

The external thread 23 includes a first thread segment 231 and a second thread segment 232 that are disposed in a continuous manner. The tooth height of the first thread segment 231 is smaller than the tooth height of the second screw segment 232. The tooth height refers to the distance between the cusp of the thread and the bottom of the tooth. In this embodiment, the tooth height of the first thread segment 231 is equal to the minimum tooth height in the lens holder 10, and the tooth height of the second screw segment 232 is equal to the maximum tooth height in the lens holder 10. The tooth height of the first thread segment 231 is different from the tooth height of the second screw segment 232 by 0.005 mm to 0.01 mm, and the torque of the first screw segment 231 relative to the internal thread 11 of the lens holder 10 is 20 gf- 30gf/cm. In the embodiment, the lens module 100 is an autofocus lens module, and the lens holder 10 is preset with a focus portion 24, and the focus portion 24 is the first screw segment 231 and the second screw. The boundary of the segment 232, that is, the first thread segment 231 extends from the lower edge 22 of the lens barrel 20 to the focus portion 24 of the lens module 100, the second screw segment 232 from the focus A portion 24 extends to the upper edge 21. When focusing, the lens barrel 20 moves relative to the lens holder 10. When the focus is successful, the first screw segment 231 just passes through the focus portion 24. Due to the lens barrel 20 Sliding from the first thread segment 231 to the second thread segment 232 can create a sense of segmentation, which is convenient for the user to determine whether the focus has been completed.

When the lens barrel 20 is screwed into the lens holder 10, the first thread segment 231 first enters the lens holder 10 and is screwed to the internal thread 11. Since the tooth height of the first screw segment 231 is small, the user can screw the first half of the lens barrel 20 into the lens holder 10 without much effort. When the first screw segment 231 is stably engaged with the lens holder 10, the torque is slightly increased, and the lens barrel 20 is continuously rotated, so that the lens barrel 20 is completely screwed into the lens holder 10 and the focus is completed. Since the difference between the tooth heights of the first screw segment 231 and the second screw segment 232 is small, the torque is not greatly increased, and the external thread 23 of the lens barrel 20 and the mirror can be avoided due to too much torque. The internal threads 11 of the seat 10 wear against each other, and since the second screw segments 232 have a large tooth diameter, the locking force can be increased when screwed into the lens holder 10.

Second embodiment

Referring to FIG. 3 and FIG. 4 , the lens module 100 a according to the second embodiment of the present invention is different from the lens module 100 provided by the first embodiment in that the tooth height of the second screw segment 232 a is from the first The thread segment 231a begins to gradually increase. Since the tooth height of the first screw segment 231a and the second screw segment 232a changes gradually, the torque is not greatly increased during the screwing of the lens barrel 20a and the lens holder 10a, thereby further reducing the torque. Too large causes the degree of wear between the external thread 23a of the lens barrel 20a and the internal thread 11a of the lens holder 10a.

In the lens module of the present invention, the first screw segment and the second screw segment having different tooth heights are disposed on the lens barrel, so that when the lens barrel is screwed with the lens holder, the user does not have to It is laborious to screw the first half of the lens barrel into the lens holder or to unscrew it from the lens holder. In addition, since the difference between the tooth height of the first screw segment and the second screw segment is small, the torque is not greatly increased, and the external thread of the lens barrel and the mirror are reduced due to too much torque. The degree to which the threads inside the seat wear each other. At the same time, since the second screw segment has a large tooth diameter, the locking force can be increased when screwed into the lens holder.

In addition, those skilled in the art can make other changes in the spirit of the invention, and all changes that are made according to the spirit of the invention should be included in the scope of the invention.

100‧‧‧ lens module

10‧‧‧Mirror seat

11‧‧‧ internal thread

20‧‧‧Mirror tube

21‧‧‧Upper edge

22‧‧‧ Lower edge

23‧‧‧ external thread

231‧‧‧First screw segment

232‧‧‧Second screw segment

24‧‧‧Focus

30‧‧‧Mirror cover

Claims (3)

A lens module includes a lens holder and a lens barrel disposed in the lens holder, the lens holder is formed with internal threads of different heights around the inner side wall thereof, and the lens barrel is formed around the outer side wall thereof Having an external thread corresponding to the internal thread, the improvement is that the external thread comprises a first screw segment and a second screw segment which are arranged continuously, and all the tooth heights of the first screw segment are equal, the second All the teeth of the screw segment are equal in height, and the tooth height of the first screw segment is smaller than the tooth height of the second screw segment. When the lens barrel is screwed into the lens holder, the first screw segment is smaller than the second screw segment. The tooth segment first enters the lens holder, and all the tooth heights of the first screw segment are equal to the minimum tooth height in the lens holder, and all the tooth heights of the second screw segment are equal to the maximum tooth height in the lens holder. The lens module is an autofocus lens module, and a focus portion is preset on the lens holder, and the focus is at a boundary between the first screw segment and the second screw segment. The lens module of claim 1, wherein the tooth height of the first screw segment is different from the tooth height of the second screw segment by 0.005 mm to 0.01 mm. The lens module of claim 1, wherein the first screw segment has a torque of 20 gf-30 gf/cm with respect to the lens holder.