TWI468764B - Lens module and method for assembling same - Google Patents

Description

Lens module and assembly method thereof

The invention relates to an optical system, in particular to a lens module and an assembly method thereof.

With the development of camera technology, the lens module has been widely used in various types of camera devices. The lens module generally includes a lens barrel, a lens holder, and a lens, a spacer ring, and a light-receiving piece housed in the lens barrel.

In the lens module, the outer peripheral surface of the lens barrel is provided with an external thread, and the lens holder is provided with an internal thread matched with the external thread. Through the internal thread and the external thread, the lens barrel can move up and down in the lens holder to achieve zoom or focus. When assembling, first fix the lens holder and then screw the lens barrel from the object side into the lens holder. The lens barrel, the lens holder and their assembly method are easy to cause the thread fragments generated by the friction between the external thread and the internal thread to fall between the components contained in the lens barrel, and the adjacent lens or the infrared filter adhere to the foreign matter. Therefore, it is easy to affect the imaging effect of the lens.

In view of this, it is necessary to provide a lens module and an assembly method thereof for preventing foreign matter from contaminating a lens to ensure an imaging effect.

A lens module includes a lens holder and a lens barrel housed in the lens holder, the lens holder having an internal thread at a portion near the image side, and the lens holder having a first smooth portion at a portion close to the object side The lens barrel has an external thread for engaging with the internal thread at a portion close to the image side, and the lens barrel has a second smoothing for bonding with the first smooth portion at a portion close to the object side The first smooth portion corresponds to an inner diameter of the lens holder that is smaller than the internal thread corresponding to the inner diameter of the lens holder, and the second smooth portion corresponds to an outer diameter of the lens barrel that is smaller than the external thread. The outer diameter of the lens barrel.

A method for assembling a lens module, comprising: providing a lens barrel and a lens holder, the lens holder having an internal thread at a portion near the image side, the mirror holder having a first smooth portion at a portion close to the object side, The lens barrel has an external thread for engaging with the internal thread at a portion close to the image side, and the lens barrel has a second smooth portion for the iron with the first smooth portion at a portion close to the object side, The first smoothing portion corresponds to an inner diameter of the lens holder that is smaller than the internal thread corresponding to the inner diameter of the lens holder, and the second smooth portion corresponds to an outer diameter of the lens barrel that is smaller than the external thread corresponding to the mirror. The outer diameter of the cylinder; the fixed lens barrel; the lens holder is sleeved on the lens barrel by the internal thread portion; the mirror barrel is kept stationary, and the mirror holder is rotated to make the first smooth portion fit the second smooth portion.

Compared with the prior art, the outer diameter of the smooth portion of the lens barrel of the embodiment of the present invention is smaller than the outer diameter of the outer thread portion, and the inner diameter of the smooth portion of the lens holder is smaller than the inner diameter of the inner thread, thereby causing friction between the smooth portions. The generated fragments fall between the threads. Therefore, the lens in the lens barrel is less likely to adhere to foreign matter and affect the imaging effect of the lens module. In the assembly process, the above effects can also be obtained by assembling from the smooth portion.

Referring to FIG. 1 , FIG. 2 and FIG. 3 , the lens module 10 according to the embodiment of the invention includes a lens holder 11 , a lens barrel 12 and a focusing ring 13 .

The lens holder 11 is a hollow cylinder including a first end portion 11a close to the object side and a second end portion 11b close to the image side, the first end portion 11a being a smooth first smooth portion 111, and the second end portion 11b An internal thread 112 is provided. The inner diameter of the first smooth portion 111 corresponding to the lens holder 11 is smaller than the inner diameter of the internal thread 112 corresponding to the lens holder 11.

The lens barrel 12 is also a hollow cylinder, and is internally provided with elements such as a lens, a filter, and the like, and the lens barrel 12 is housed in the lens holder 11. The outer surface of the lens barrel 12 has an external thread 122 and a second smoothing portion 121. The external thread 122 is close to the image side, the second smooth portion 121 is close to the object side, and the second smooth portion 121 has the same contour as the first smooth portion 111. The outer diameter of the second smooth portion 121 corresponding to the lens barrel 12 is smaller than the outer diameter of the outer thread 122 corresponding to the lens barrel 12.

The lens barrel 12 is housed in the lens holder 11 by the cooperation of the external thread 122 and the internal thread 112. The lens barrel 12 is provided with a notch 124 in the second smooth portion 121, and the external thread 122 is provided with a card slot 123. When the lens module 10 is assembled, the clamping tool fixes or holds the lens barrel 12 by the card slot 123.

The focus ring 13 includes a body 131 and a focusing column 132 of the protruding body 131. The number of the focusing columns 132 is the same as the number of the notches 124. The focusing column 132 is aligned with the notch 124, and a slight force is applied along the axial direction of the lens barrel 12. After the sound of "啪" is heard, it is proved that the focusing ring 13 and the lens barrel 12 have been engaged, and the focusing ring 13 can be rotated to make the mirror The barrel 12 moves up and down within the lens holder 11 to achieve a focus or zoom function of the lens module 10. When the focus ring 13 is removed, the focus ring 13 can be removed by gently pulling outward along the axial direction of the lens module 10.

In assembling the lens module 10, the lens barrel 12 is fixed by using the clamping tool to engage the card slot 123, and then the second end portion 11b of the lens holder 11 is fitted over the lens barrel 12 via the second smoothing portion 121, and the lens barrel 12 is held. The mirror base 11 is rotated without moving until the lens barrel 12 and the lens holder 11 are assembled in position. As the mirror base 11 rotates, the first smooth portion 111 contacts the second smooth portion 121 and is in close contact with each other, and at this time, the direction of movement of the internal thread 112 and the external thread 122 can be guided.

During the continuous rotation of the lens holder 11, as the second smooth portion 121 gradually enters the first smooth portion 111, the external thread 122 is in contact with the internal thread 112, and the first smooth portion 111 and the second smooth portion 121 are generated by friction. The debris falls between the external thread 122 and the internal thread 112, so that the lens in the lens barrel 12 is less likely to adhere to foreign matter and affect the imaging effect of the lens module 10.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10‧‧‧Lens module

11‧‧‧Mirror seat

12‧‧‧Mirror tube

13‧‧‧focus ring

11a‧‧‧First end

11b‧‧‧second end

111‧‧‧First smoothing department

112‧‧‧ internal thread

122‧‧‧External thread

121‧‧‧Second smoothing

124‧‧‧ gap

123‧‧‧ card slot

131‧‧‧Ontology

132‧‧‧focus column

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

2 is an exploded view of a lens module in accordance with an embodiment of the present invention.

Figure 3 is a cross-sectional view taken along line III-III of Figure 1.

11‧‧‧Mirror seat

12‧‧‧Mirror tube

13‧‧‧focus ring

11a‧‧‧First end

11b‧‧‧second end

122‧‧‧External thread

121‧‧‧Second smoothing

124‧‧‧ gap

123‧‧‧ card slot

131‧‧‧Ontology

132‧‧‧focus column

Claims (6)

A lens module includes a lens holder and a lens barrel housed in the lens holder, wherein: the lens holder has an internal thread at a portion near the image side, and the lens holder has a first portion at a portion close to the object side a smoothing portion having an external thread for engaging with the internal thread at a portion close to the image side, the lens barrel having a portion for attaching to the first smooth portion at a portion close to the object side a second smoothing portion, wherein an inner diameter of the first smoothing portion corresponding to the lens holder is smaller than an inner diameter of the lens holder, and an outer diameter of the second smoothing portion corresponding to the outer diameter of the lens barrel is smaller than the outer diameter The thread corresponds to the outer diameter of the barrel. The lens module of claim 1, wherein the lens barrel is provided with a card slot at an end of the image side. The lens module of claim 1, wherein: the end of the lens barrel at the object side is provided with a notch. The lens module of claim 3, wherein: the lens module further comprises a focus ring, the focus ring has the same number of focus columns as the notch, and the focus column card Closed within the gap. An assembly method of a lens module according to claim 1, comprising:
Fixed lens barrel;
Locating the lens holder from the portion having the internal thread and the lens barrel;
Keep the lens barrel stationary, and rotate the lens holder so that the first smooth portion fits the second smooth portion. The method of assembling a lens module according to claim 5, further comprising: providing a focusing ring, the lens barrel is provided with a notch at an end of the object side, and the focusing ring has the same The focusing column with the same number of notches, the focusing column is aligned with the notch, and the focusing ring is pressed to be assembled on the lens barrel.