TWI443400B - Lens module - Google Patents

Description

Lens module

The present invention relates to the field of imaging, and in particular to a lens module.

With the rapid development of multimedia technology, digital cameras, camcorders, mobile phones with cameras and notebook computers are increasingly favored by consumers.

Camera modules in digital cameras, video cameras, mobile phones, and notebook computers typically include a lens module. The lens module generally includes a plurality of lenses, an infrared filter and a light shielding film.

In the lens assembly process, the thin plastic shading sheet often has an electrostatic effect, is not easy to be assembled and fixed in the lens barrel, or is moved by electrostatic adsorption after the dispensing is completed. In the automatic assembly process, this effect often results in a decrease in yield on the process or an increase in process time.

In view of this, it is necessary to provide a lens module that is easy to assemble.

A lens module includes a lens barrel and a light shielding film housed in the lens barrel. The inner wall of the lens barrel is provided with an annular groove surrounding the central axis of the lens barrel. The visor is engaged in an annular groove of the inner wall of the lens barrel.

Compared with the prior art, the light shielding sheet of the lens module provided by the present invention is engaged in the groove of the inner wall of the lens barrel, thereby preventing the light shielding sheet from moving in the lens barrel due to electrostatic adsorption. In order to improve the yield on the process, the dispensing process between the visor and the lens barrel is omitted, which makes the assembly process relatively simple.

10‧‧‧Lens module

20‧‧‧Mirror tube

30‧‧‧ lens group

40‧‧‧shading film

50‧‧‧Filter

301‧‧‧ first lens

303‧‧‧second lens

202‧‧‧large inner diameter section

203‧‧‧Small inner diameter section

204‧‧‧ annular groove

FIG. 1 is a schematic diagram of a combination of lens modules according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a lens module according to an embodiment of the present invention.

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

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

Referring to FIG. 1 , FIG. 2 and FIG. 3 , a lens module 10 according to an embodiment of the invention includes a lens barrel 20 , a lens group 30 , a light shielding sheet 40 , and a filter 50 . The lens group 30 is composed of a plurality of lenses. In the present embodiment, the lens group 30 is composed of a first lens 301 and a second lens 303.

The lens barrel 20 is a hollow cylinder which is open at one end and is semi-closed at one end, and has a larger inner diameter section 202 and a smaller inner diameter section 203. The smaller inner diameter section 203 is adjacent to the semi-closed end of the lens barrel 20 for receiving the first lens 301. The larger inner diameter section 202 is adjacent to the open end of the lens barrel 20 for receiving the second lens 303 and the filter 50.

The inner wall of the smaller inner diameter section 203 defines an annular groove 204 surrounding the central axis of the lens barrel 20. The groove 204 is for receiving the light shielding sheet 40. The groove 204 has an opening width L of 0.1 to 0.3 mm along a central axis parallel to the lens barrel 20. In this embodiment, the groove 204 has an opening width L of 0.1 mm parallel to the central axis of the lens barrel 20. Of course, the opening width L can be determined according to actual conditions, and is not limited to 0.1 to 0.3 mm.

Of course, the groove 204 can also be opened on the inner wall of the larger inner diameter section 202. Of course, the groove 204 can also be used to receive the filter 50.

The light shielding sheet 40 has an annular shape and is engaged in the groove 204 of the inner wall of the lens barrel 20. The outer diameter of the light shielding sheet 40 is equal to the outer diameter D of the groove 204 such that the light shielding sheet 40 is not displaced in a plane perpendicular to the central axis of the lens barrel 20. The light shielding sheet 40 is made of plastic and has a thickness of 0.03 to 0.05 mm. In this embodiment, the thickness of the light shielding sheet 40 is 0.05 mm, and the light shielding sheet 40 is located between the first lens 301 and the second lens 303, and the opposite surfaces thereof are respectively opposed to the first lens 301 and the second lens 303. hold. Of course, the thickness of the light shielding sheet 40 can also be determined according to actual conditions, and is not limited to 0.03 to 0.05 mm.

The filter 50 is in the form of a disk, which can be used to filter light to prevent the image sensor from generating noise. Different filters 50 can filter light of different wavelengths. In this embodiment, the filter 50 can be an IR-Cut Filter, a Low Pass Filter, or Other types of filters.

When assembled, the first lens 301 is loaded into the smaller inner diameter section 203 from the open end of the lens barrel 20, and the first lens 301 is fixed to the inner wall of the smaller inner diameter section 203 of the lens barrel 20, and then The light shielding sheet 40 faces the open end of the lens barrel 20 and applies force to the light shielding sheet 40 to be slightly deformed and caught in the groove 204, and then the second lens 303 and the filter 50 are sequentially opened from the opening of the lens barrel 20. The end is inserted into the larger inner diameter segment 202, and the second lens 303 and the filter 50 are fixed on the inner wall of the larger inner diameter segment 202. At this time, the light shielding sheet 40 is located at the first lens 301 and the second surface. The lens 303 and the second lens 303 are located between the light shielding sheet 40 and the color filter 50. Thus, the lens module 10 is assembled.

Since the light shielding sheet 40 is thin, after the light shielding sheet is biased, the light shielding sheet 40 can be slightly deformed and caught in the groove 204, thereby preventing the light shielding sheet 40 from moving inside the lens barrel 20 due to electrostatic adsorption. Increasing the yield on the process, and eliminating the dispensing process between the visor 40 and the lens barrel 20, the assembly process is relatively simple.

It can be understood that the lens barrel 20, the light shielding sheet 40 and the color filter 50 are not limited to a cylindrical shape, and may have other shapes.

It can be understood that the lens barrel 20 can also be a hollow cylinder having the same inner diameter, and an annular groove 204 is formed adjacent to the open end of the lens barrel 20 or the semi-closed end of the lens barrel 20.

It can be understood that the lens barrel 20 can also be a hollow cylinder having three, four or more different inner diameters, and an annular groove is formed adjacent to the open end of the lens barrel 20 or the semi-closed end of the lens barrel 20. 204.

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

20‧‧‧Mirror tube

40‧‧‧shading film

50‧‧‧Filter

301‧‧‧ first lens

303‧‧‧second lens

204‧‧‧ annular groove

Claims (10)

A lens module includes a lens barrel, a first lens and a second lens received in the lens barrel, and a light shielding film received in the lens barrel, wherein the light shielding film is located between the first lens and the second lens, wherein The inner wall of the lens barrel is provided with an annular groove surrounding the central axis of the lens barrel, and the light shielding sheet is engaged in the annular groove of the inner wall of the lens barrel, and the opposite surfaces of the light shielding sheet respectively correspond to the first lens and the first lens Two lenses resist. The lens module of claim 1, wherein the lens barrel is a hollow cylinder having an open end and a semi-closed end, and has a larger inner diameter section and a smaller inner diameter section. The diameter section is adjacent to the semi-closed end of the lens barrel, and the larger inner diameter section is adjacent to the open end of the lens barrel, and the groove is disposed on the inner wall of the smaller inner diameter section. The lens module of claim 2, wherein the first lens is received in the smaller inner diameter segment, and the second lens is received in the larger inner diameter segment. The lens module of claim 3, wherein the lens module further comprises a filter, the filter is received in the lens barrel, so that the lens barrel is sequentially received from the object side to the image side. There are a first lens, a light shielding film, a second lens and a filter. The lens module of claim 1, wherein the lens barrel is a hollow cylinder having an open end and a semi-closed end, and has a same inner diameter, and the groove is disposed adjacent to the semi-closed end of the lens barrel. On the inner wall. The lens module of claim 5, wherein the first lens is adjacent to the semi-closed end of the lens barrel, and the second lens is adjacent to the open end of the lens barrel. The lens module of claim 6, wherein the lens module further comprises a filter, the filter is received in the lens barrel, so that the lens barrel is sequentially received from the object side to the image side. There are a first lens, a light shielding film, a second lens and a filter. The lens module of claim 1, wherein the outer diameter of the light shielding plate is equal to the outer diameter of the groove. The lens module of claim 1, wherein the thickness of the light shielding sheet is 0.03 to 0.05 mm. The lens module of claim 1, wherein the groove has an opening width of 0.1 to 0.3 mm parallel to a central axis of the lens barrel.