TWI447457B - Lens module - Google Patents

Description

Lens module

The invention relates to a lens module.

At present, most lens modules are composed of a plurality of lenses, aperture plates, lens barrels and the like. The specific structure of the lens module is generally such that a plurality of lenses and aperture sheets are housed in the lens barrel. The optical image signal entering the lens barrel is focused by the lens and reaches the image sensor, and the image sensor converts the optical image signal into an electronic image signal. At present, the aperture lens used in the miniaturized lens module is a fixed aperture plate. Due to the design requirements, the aperture plate is usually added to the image side of the lens closest to the image sensor. Since the thickness of the aperture sheet is relatively thin, when the adhesive is fixed to the periphery of the aperture sheet, it is often picked up by the dispensing needle (electrostatic force), thus affecting the assembly rate. When the aperture piece is assembled to the lens barrel at the same time, the aperture piece has no positioning point, and it is difficult to maintain the positional accuracy of the aperture piece relative to the lens barrel. Therefore, the assembly yield is low.

In view of this, it is necessary to provide a lens module that can improve assembly rate and assembly yield.

A lens module includes a lens barrel, at least one lens, and an aperture sheet. The lens barrel includes a barrel and a front cover. The front cover is disposed on the cylinder. The barrel includes an inner side wall, and the at least one lens is disposed on an inner side wall of the barrel. The aperture sheet includes a central light transmission area and a light shielding area surrounding the central light transmission area. Said The opaque area is provided with a plurality of notches away from the edge of the central transparent area. A plurality of protrusions are formed between the notches. The aperture plate is disposed on a side of the at least one lens away from the front cover and is abutted on an inner side wall of the cylinder by the protrusion. A plurality of gaps are formed between the inner side wall of the cylinder and the notch of the diaphragm. The gap is filled with a gel to fix the aperture plate to the lens and the barrel.

Compared with the prior art, the light shielding area of the aperture lens of the lens module provided by the present invention is provided with a plurality of notches away from the edge of the central light transmission area, and a plurality of gaps are formed between the plurality of notches and the inner side wall of the cylinder body. . When the lens module is assembled with the colloid, the colloid may flow along the gap between the aperture stop and the image end face of the non-optical portion of the second lens. Therefore, when the dispensing is avoided, the dispensing needle contacts the aperture sheet and is sucked up by the dispensing needle to increase the assembly rate, and the protrusion abuts against the inner side wall of the barrel of the lens barrel to maintain the The positional accuracy of the aperture sheet relative to the lens barrel effectively maintains the concentricity of the two and improves the assembly yield.

100‧‧‧ lens module

10‧‧‧Mirror tube

11‧‧‧Cylinder

12‧‧‧ front cover

20‧‧‧ first lens

22‧‧‧Optical part of the first lens

24‧‧‧ Non-optical part of the first lens

30‧‧‧second lens

32‧‧‧Optical part of the second lens

34‧‧‧ Non-optical part of the second lens

40‧‧‧shading film

401‧‧‧through hole

241‧‧‧The end face of the first lens

242‧‧‧Image end face of the first lens

50‧‧‧ aperture film

341‧‧‧End face of the second lens

342‧‧‧The end face of the second lens

120‧‧‧Into the light hole

510‧‧ ‧ gap

112‧‧‧ inner side wall

60‧‧‧ colloid

343‧‧‧Bump

121‧‧‧ Groove

501‧‧‧Lighting area

502‧‧‧ shading area

520‧‧‧ bumps

1 is a schematic structural view of a lens module according to an embodiment of the present invention; and FIG. 2 is a schematic perspective view of the aperture lens of FIG.

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

1 and 2, a lens module 100 according to an embodiment of the present invention includes a lens barrel 10, at least one lens, and an aperture sheet 50 disposed on at least one lens. The at least one lens and the aperture plate 50 are disposed in the lens barrel 10 .

The lens barrel 10 is a semi-closed cylindrical body, and the lens barrel 10 includes a barrel 11 and a front cover 12. The front cover 12 is covered on the cylindrical body 11. In this embodiment, the The cylinder 11 is integrally formed with the front cover 12. A light entrance hole 120 is defined in the center of the front cover 12, and external light enters the lens barrel 10 through the light entrance hole 120. The cylindrical body 11 includes an inner side wall 112, and the inner side wall 112 of the cylindrical body 11 is black, which absorbs light projected to the inner side wall 112 of the cylindrical body 11 to reduce a part of the light irradiated into the cylindrical body 11. The effect of stray light formed behind the sidewalls 112 on the quality of the image. It can be understood that the lens barrel 10 as a whole can also be made of an opaque material to achieve the purpose of masking light.

The at least one lens is made of glass or plastic, and the at least one lens is a spherical lens or an aspherical lens. In this embodiment, the at least one lens includes a first lens 20 and a second lens 30. The first lens 20 includes an optical portion 22 and a non-optical portion 24 surrounding the optical portion 22. The optical portion 22 is an optically active portion of the lens, and the optical portion 22 can be disposed in a concave or convex shape as needed to diverge or converge light. The non-optical portion 24 surrounds and connects the optical portion 22, and functions mainly to place and support the adjacent optical portion 22. The non-optical portion 24 includes an object end surface 241 and an image end surface 242. The object end surface 241 of the non-optical portion 24 of the first lens 20 faces the light entrance hole 120 and is fixed to the inner wall of the front cover 12 by gluing. A plurality of first positioning portions are disposed on the image end surface 242 of the non-optical portion 24, and in the embodiment, the plurality of first positioning portions are grooves 121. The grooves 121 are equally spaced. The groove 121 has a hemispherical shape. It can be understood that the groove 121 can also be substantially prismatic or tapered.

The second lens 30 includes an optical portion 32 and a non-optical portion 34 surrounding the optical portion 32. The non-optical portion 34 surrounds and connects the optical portion 32, and functions mainly to place and support the adjacent optical portion 32. The non-optical portion 34 includes an object end surface 341 and an image end surface 342. The object end surface 342 of the non-optical portion 34 corresponds to the non-optical portion 24 of the first lens 20 The image end surface 242 is provided with a plurality of second positioning portions corresponding to the first positioning portion. In this embodiment, the plurality of second positioning portions are a plurality of protrusions 343 that match the plurality of grooves 121. The plurality of protrusions 343 are correspondingly inserted into the recesses 121 such that the second lens 30 is positioned on the image end surface 242 of the non-optical portion 24 of the first lens 20 .

The cooperation between the first positioning portion and the second positioning portion increases the degree of close fitting and positioning accuracy between the first lens 20 and the second lens 30, thereby further improving the lens module 100. Performance of use.

It can be understood that the first positioning portion is a protrusion and the second positioning portion is a groove; the first positioning portion is an annular groove and the second positioning portion is a flange; or the One positioning portion is a flange and the second positioning portion is an annular groove, and is not limited to the embodiment.

In this embodiment, the lens module 100 further includes a light shielding sheet 40. The light shielding sheet 40 is provided with a plurality of through holes 401 matching with the protrusions 343, and the through holes 401 are equally spaced on the light shielding sheet 40 on the circumference. The protrusion 343 is engaged with the groove 121 through the through hole 401. Providing the light shielding sheet 40 between the first lens 20 and the second lens 30 can effectively absorb stray light between the first lens 20 and the non-optical portion 34 of the second lens 30, thereby improving the lens module. Imaging quality.

The aperture sheet 50 has a hollow annular shape. In the present embodiment, the aperture sheet 50 is disposed on the image end surface 342 side of the second lens 30. The aperture sheet 50 includes a central light transmitting region 501 and a light shielding region 502 surrounding the central light transmitting region 501. The material of the light-shielding region 502 is polydimethyl siloxane, that is, PDMS. In this embodiment, a plurality of evenly distributed notches 510 are defined in the edge of the light shielding region 502 away from the central light transmitting region 501. A protrusion 520 is formed between the adjacent notches 510. In the gap 510 of the aperture sheet 50 A plurality of gaps are formed between the inner side wall 112 of the barrel 11. At the same time, the protrusion 520 abuts against the inner side wall 112 of the barrel 11 of the lens barrel 10 for maintaining the positional accuracy of the aperture piece 50 with respect to the lens barrel 10, effectively maintaining the concentricity of the two.

In the present embodiment, the aperture sheet 50 is fixed to the image side surface 342 of the non-optical portion 34 of the non-optical portion 34 of the second lens 30 by a colloid 60. The colloid 60 is a colored colloid, the colored colloid is black and has an adhesion function, and the black colored colloid absorbs light of all colors. The colored colloid is a one-component epoxy adhesive, the main component is epoxy resin, which has the characteristics of strong adhesion, low stress and low shrinkage. The colored colloid is condensed after being irradiated for a period of time under the light. In this embodiment, the colored colloid is a black glue or a bonding gel. The colored colloid is filled in a plurality of gaps formed between the notch 510 of the aperture sheet 50 and the inner sidewall 112 of the barrel 11 to fix the aperture sheet 50 to the non-optical of the second lens 30. The image is shown on the end face 342 of the portion 34. In the present embodiment, the colored colloid 60 can effectively absorb stray light passing through the peripheral edges of the second lens 20 and the third lens 30. At the same time, since the colloid 60 can flow into the image of the non-optical portion 34 of the aperture sheet 50 and the second lens 30 along a plurality of gaps formed between the notch 510 of the aperture sheet 50 and the inner side wall 112 of the barrel 11. Between the end faces 342. Therefore, when the dispensing is avoided, the dispensing needle contacts the aperture sheet 50 and is sucked up by the dispensing needle, thereby increasing the assembly rate.

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 tube

11‧‧‧Cylinder

12‧‧‧ front cover

20‧‧‧ first lens

22‧‧‧Optical part of the first lens

24‧‧‧ Non-optical part of the first lens

30‧‧‧second lens

32‧‧‧Optical part of the second lens

34‧‧‧ Non-optical part of the second lens

40‧‧‧shading film

401‧‧‧through hole

241‧‧‧The end face of the first lens

242‧‧‧Image end face of the first lens

50‧‧‧ aperture film

341‧‧‧End face of the second lens

342‧‧‧The end face of the second lens

120‧‧‧Into the light hole

510‧‧ ‧ gap

112‧‧‧ inner side wall

60‧‧‧ colloid

343‧‧‧Bump

121‧‧‧ Groove

Claims (8)

A lens module includes a lens barrel, at least one lens, and an aperture plate, the lens barrel includes a barrel and a front cover, and the front cover is disposed on the barrel, the barrel An inner sidewall is disposed, the at least one lens is disposed on an inner sidewall of the cylinder, the aperture sheet includes a central light transmissive region and a light shielding region surrounding the central light transmissive region, and the at least one lens includes a first lens And a second lens, the first lens is positioned on an inner wall of the front cover, and the first lens is positioned on an end surface of the non-optical portion of the second lens, and the improvement is that the aperture plate is disposed On the image end surface of the non-optical portion of the second lens, the light-shielding region is provided with a plurality of notches away from the edge of the central light-transmissive region, and a plurality of protrusions are formed between the notches, and the aperture plate is formed by The protrusion is abutted on the inner side wall of the barrel, and a plurality of gaps are formed between the inner side wall of the barrel and the notch of the aperture sheet, and the gap is used to fill the colloid during dispensing Preventing the dispensing needle from coming into contact with the aperture sheet and being sucked up by the dispensing needle The colloidal sheet for the diaphragm and fixed to the lens barrel. The lens module of claim 1, wherein: the image end surface of the non-optical portion of the first lens is provided with a plurality of first positioning portions, and the object end surface of the non-optical portion of the second lens Corresponding to the second positioning portion corresponding to the first positioning portion of the first lens, the first lens is positioned on the object end surface of the non-optical portion of the second lens by the cooperation of the first positioning portion and the second positioning portion . The lens module of claim 2, wherein: the first positioning portion is a plurality of grooves, and the second positioning portion is a plurality of protrusions matching the plurality of grooves. The lens module of claim 2, wherein: the first positioning portion is a plurality of protrusions, and the second positioning portion is a plurality of grooves matching the plurality of protrusions. The lens module of claim 1, wherein: the lens module further comprises a cover a light sheet, the light shielding sheet being disposed between the first lens and the second lens. The lens module of claim 1, wherein the aperture plate has a hollow annular shape. The lens module of claim 1, wherein the colloid is a black colored colloid. The lens module of claim 1, wherein: the inner side wall of the barrel of the lens barrel is black.