CN102914843B - Camera lens module - Google Patents

Abstract

A kind of camera lens module, including a lens barrel and the second eyeglass of being contained in described lens barrel, 3rd eyeglass, one brake sack, described second eyeglass and described 3rd eyeglass are arranged in order from object end to the image end, described brake sack is arranged between the non-optical division of described second eyeglass and described 3rd eyeglass, first support division is included on the non-optical division as end surfaces of described second eyeglass, described first support division offsets with described brake sack, the first recess of a triangle is offered on described first support division, the bore of described first recess is L1, wherein 0.0377≤L1/D≤0.0943, wherein D be described lens barrel as the internal diameter of end face, can effectively eliminate the veiling glare in the image of imaging, to be effectively improved the image quality of described camera lens module.

Description

Lens module

technical field

The invention relates to a lens module.

Background technique

Because the price of plastic lenses is much cheaper than that of glass lenses, out of cost considerations, current lens modules generally use plastic lenses, but the optical properties of plastic lenses are inferior to glass lenses in many aspects, making lens modules using plastic lenses now The imaging quality of the group is not high. When the lens module uses the light of a flashlight as a light source to shoot in a dark room environment, the stray light phenomenon in the image formed on the image sensor of the lens module is relatively serious.

Contents of the invention

In view of this, it is necessary to provide a lens module that can effectively improve the imaging quality.

A lens module, comprising a lens barrel and a first lens, a second lens, a third lens and a light-shielding sheet accommodated in the lens barrel, the first lens, the second lens and the The third lenses are arranged sequentially from the object end to the image end, each lens includes an optical part and a non-optical part, the optical part is used for optical imaging, and the non-optical part is connected to the surrounding of the optical part Around, the shading sheet is arranged between the non-optical part of the second lens and the third lens, and the non-optical part of the image end surface of the second lens includes a first abutting part, the The first abutting portion is abutted against the light-shielding sheet, and a triangular-shaped first notch is opened on the first abutting portion, and the diameter of the first notch is L1, wherein 0.0377≤L1/D≤0.0943 , where D is the inner diameter of the image end surface of the lens barrel.

The lens module of the present invention can effectively eliminate stray light in the imaged image by providing a notch on the second lens, so as to effectively improve the imaging quality of the lens module.

Description of drawings

FIG. 1 is a schematic structural diagram of a lens module in a preferred embodiment of the present invention.

FIG. 2 is a schematic diagram of half of the second lens of the lens module in FIG. 1 .

FIG. 3 is a schematic diagram of half of the fifth lens of the lens module in FIG. 1 .

Description of main component symbols

Lens Module 100

Lens barrel 101

object end face 102

like end face 103

Storage space 104

first lens 11

second lens 12

First Resistance 121

First notch 122

Second Resistance 125

Third Resistance 126

Connector 127

Inclined 129

first end 129a

second end 129b

third lens 13

fourth lens 14

fifth lens 15

Second Resistance 151

Second notch 152

Arc groove 156

Shade 20

Image sensor 30

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

detailed description

Please refer to FIG. 1 , which is a lens module 100 provided by an embodiment of the present invention, which includes a lens barrel 101 , a first lens 11 , a second lens 12 , a third lens 13 , a fourth lens 14 , and a fifth lens 15 , four shading sheets 20 and an image sensor 30 .

The lens barrel 101 is cylindrical and includes a half-closed object end surface 102 , an unclosed image end surface 103 and an accommodating space 104 communicating with both the object end surface 102 and the image end surface 103 . In this embodiment, the inner diameter D of the image end surface 103 is 5.3 mm.

The first lens 11 , the second lens 12 , the third lens 13 , the fourth lens 14 and the fifth lens 15 are accommodated in the accommodating space 104 , and along the optical axis M of the lens module 100 from Arranged from the object end to the image end. Each lens includes an optical part and a non-optical part. The optical part is used for optical imaging. The non-optical part is connected around the periphery of the optical part. When taking an image, light passes through the first lens 11 , the second lens 12 , the third lens 13 , the fourth lens 14 and the fifth lens 15 in sequence, and reaches the image sensor 30 for imaging.

The four shading sheets 20 are made of elastic material and are in the shape of a hollow ring, accommodated in the accommodating space 104, and are respectively arranged on the first lens, the second lens, and the second lens. Between the non-optical parts of the lens and the third lens, the third lens and the fourth lens, and the fourth lens and the fifth lens.

As shown in FIG. 2 , the non-optical part of the image end surface of the second lens 12 includes a first abutment part 121 , and the first abutment part 121 is close to the corresponding optical part and abuts against the corresponding shading sheet 20 hold. A triangular-shaped first notch 122 is defined on the first resisting portion 121 . The diameter of the first notch 122 is L1, 0.2mm≤L1≤0.5mm, and 0.0377≤L1/D≤0.0943. The first notch 122 includes a vertex facing the light-shielding sheet 20 with an angle of θ1, 120°≤θ1≤170°. The distance between the vertex A of the first notch 122 and the optical axis M of the lens module 100 is D1. The distance between the vertex A of the first notch 122 and the surface where the first abutting portion 121 is located is D2 (that is, the depth of the first notch 122), 0.01mm≤D2≤0.05mm, obtained Out of 0.002≤D2/D≤0.009. In this embodiment, L1 is 0.46 mm, θ1 is 124°, D1 is 1.39 mm, and D2 is 0.05 mm. In this way, when the angle between the light source and the optical axis M of the lens module 100 is 45°, the noise of the meniscus next to the light source in the image formed by the light source on the image sensor 30 can be reduced. astigmatism.

The non-optical portion of the second lens 12 includes a second resisting portion 125 , a third resisting portion 126 and a connecting portion 127 . The second resisting portion 125 is located on the side wall of the non-optical portion of the second lens 12, the third resisting portion 126 is provided on the image end surface of the second lens 12, and the connecting portion 127 is connected to Between the second resisting portion 125 and the third resisting portion 126 . The second resisting portion 125 is resisted against the inner wall of the lens barrel 101 . The third abutting portion 126 is abutted against the third lens 13 . The connecting portion 127 includes an inclined surface 129 . The included angle between the slope 129 and the optical axis M of the lens module 100 is θ2, 100°≤θ2≤160°. The slope 129 includes a first end 129a and a second end 129b. The first end 129 a is away from the optical axis M of the lens module 100 . The second end 129b is close to the optical axis M of the lens module 100 . The distance between the first end 129a and the optical axis M of the lens module 100 is D3, 2mm≤D3≤2.5mm, and 0.377≤D3/D≤0.472, the distance between the second end 129b and the The distance between the optical axes M of the lens module 100 is D4, 1.8mm≤D4≤2.4mm, and 0.339≤D4/D≤0.453. In this embodiment, θ2 is 135°, D3 is 2.32 mm, and D4 is 2.15 mm. In this way, when the angle between the light source and the optical axis M of the lens module 100 is 46°, the blade-shaped stray light in the image formed by the light source on the image sensor 30 can be eliminated, and at the same time It can also eliminate the scimitar-shaped stray light in the image formed by the light source on the image sensor 30 when the light source forms an included angle of 52° with the optical axis M of the lens module 100 .

As shown in FIG. 3 , the object end surface of the fifth lens 15 includes a fourth abutting portion 151 , and the fourth abutting portion 151 abuts against the corresponding light-shielding sheet 20 . A second triangular notch 152 is defined on the fourth resisting portion 151 . The diameter of the second notch 152 is L2, 0.1mm≤L2≤0.5mm, and 0.019≤L2/D≤0.094. The second notch 152 includes a top angle θ3 facing the light-shielding sheet 20 , 120°≤θ3≤170°. The distance between the vertex B of the second notch 152 and the optical axis M of the lens module 100 is D5, 1.7mm≤D5≤2.3mm, and 0.321≤D5/D≤0.434. The distance between the vertex B of the second notch 152 and the surface where the fourth abutting portion 151 is located is D6 (ie the depth of the second notch 152), 0.1mm≤D6≤0.5mm, obtained Out of 0.019≤D6/D≤0.094. In this embodiment, L2 is 0.15 mm, θ3 is 124°, D5 is 2 mm, and D6 is 0.18 mm. In this way, when the angle between the light source and the optical axis M of the lens module 100 is 36°, the stray light distributed in a diffuse shape in the image formed by the light source on the image sensor 30 can be reduced. .

The image side of the fifth eyeglass 15 is also provided with a shading sheet 20, the non-optical portion of the image end surface of the fifth eyeglass 15 is close to the optical portion and is shielded from the image side of the fifth eyeglass 15. A circular arc groove 156 is formed on the part of the sheet 20 spaced apart by a certain distance. The radius R1 of the arc groove 156, 0.03mm≤R1≤3mm, is 0.006≤R1/D≤0.566, the diameter of the arc groove 156 is L3, 0.1mm≤L3≤0.5mm, and 0.019≤L3/D≤0.094, the distance between the end of the arc groove 156 close to the corresponding optical part and the optical axis M of the lens module 100 is D7, 2mm≤D7≤2.6mm, 0.377 ≤D7/D≤0.491. In this embodiment, R1 is 0.1 mm, L3 is 0.15 mm, and D7 is 2.26 mm. At the same time, the arc groove 156 is subjected to atomization treatment, so that when the light source and the optical axis M of the lens module 100 form an angle of 36°, the light source on the image sensor 30 The stray light distributed in a diffuse shape in the image formed above.

The lens module of the present invention can effectively eliminate the stray light in the image formed by the light source on the image sensor by providing notches or atomizing treatment on different parts of each lens, so as to effectively improve the Describe the imaging quality of the lens module.

It can be understood that those skilled in the art can make various other corresponding changes and modifications according to the technical concept of the present invention, and all these changes and modifications should belong to the protection scope of the claims of the present invention.

Claims (8)

1. A lens module, comprising a lens barrel and a first lens, a second lens, a third lens and a light-shielding sheet accommodated in the lens barrel, the first lens, the second lens and The third lenses are arranged sequentially from the object end to the image end, each lens includes an optical part and a non-optical part, the optical part is used for optical imaging, and the non-optical part is connected around the optical around the portion, the shading sheet is arranged between the second lens and the non-optical portion of the third lens, and it is characterized in that the non-optical portion of the image end surface of the second lens includes a first The abutment part, the first abutment part is abutted against the light-shielding sheet, and a triangular-shaped first notch is opened on the first abutment part, and the diameter of the first notch is L1, wherein 0.0377 ≤L1/D≤0.0943, wherein D is the inner diameter of the image end surface of the lens barrel. 2 . The lens module according to claim 1 , wherein the first notch includes a vertex angle θ1 facing the light-shielding sheet, and the vertex angle θ1 satisfies 120°≤θ1≤170°. 3. The lens module according to claim 1, wherein the non-optical portion of the second lens comprises a second abutting portion, a third abutting portion and a connecting portion, the second abutting portion The holding portion is located on the side wall of the non-optical portion of the second lens, the third abutting portion is provided on the image end surface of the second lens, and the connecting portion is connected between the second abutting portion and the second abutting portion. between the third abutting portions, the second abutting portion is abutted against the inner wall of the lens barrel, the third abutting portion is abutted against the third lens, the connecting portion includes a slope, The included angle between the slope and the optical axis of the lens module is θ2, and the included angle θ2 satisfies 100°≤θ2≤160°. 4. The lens module according to claim 3, wherein the slope comprises a first end and a second end, the first end is far away from the optical axis of the lens module, and the second end close to the optical axis of the lens module, the distance between the first end and the optical axis of the lens module is D3, 0.377≤D3/D≤0.472, the second end and the lens module The distance between the optical axes is D4, 0.339≤D4/D≤0.453, wherein D is the inner diameter of the image end surface of the lens barrel. 5. The lens module according to claim 1, wherein the lens module further comprises a fourth lens and a fifth lens accommodated in the lens barrel, the fourth and fifth lenses Located on the image side of the third lens, and arranged sequentially from the object end to the image end of the lens module, the lens module also includes three light-shielding sheets, and the three light-shielding sheets are respectively located on the first Between the lens and the second lens, the third lens and the fourth lens, the fourth lens and the fifth lens, the non-optical portion of the object end surface of the fifth lens includes a The fourth abutting portion corresponding to the light-shielding sheet is abutted, and a second notch is formed on the fourth abutting portion. 6. The lens module according to claim 5, wherein the diameter of the second notch is L2, 0.019≤L2/D≤0.094, and the second notch includes a The apex angle θ3 of the light-shielding sheet between the lens and the fifth lens, 120°≤θ3≤170°, the distance between the apex of the second notch and the optical axis of the lens module is D5, 0.321 ≤D5/D≤0.434, the distance between the apex of the second notch and the surface where the fourth abutting portion is located is D6, 0.019≤D6/D≤0.094, where D is the image of the lens barrel The inner diameter of the end face. 7. The lens module according to claim 5, wherein a shading sheet is provided on the image side of the fifth lens, and the non-optical part of the object end surface of the fifth lens is close to the optical lens. An arc groove is formed on the part of the fifth lens element that is at a certain distance from the light-shielding sheet on the image side, and the arc groove is subjected to atomization treatment. 8. The lens module according to claim 7, wherein the radius of the arc groove is R1, 0.006≤R1/D≤0.566, and the diameter of the arc groove is L3, 0.019≤L3 /D≤0.094, the distance between the end of the arc groove near the corresponding optical part and the optical axis of the lens module is D7, 0.377≤D7/D≤0.491, where D is the image of the lens barrel The inner diameter of the end face.