CN-117215026-B - Imaging lens, camera module and electronic device

CN117215026BCN 117215026 BCN117215026 BCN 117215026BCN-117215026-B

Abstract

The invention provides an imaging lens, a camera module and an electronic device, wherein the imaging lens comprises a plastic optical lens element, a lens barrel and a light absorbing coating, the plastic optical lens element is provided with an object side surface, an image side surface and an outer diameter surface, the outer diameter surface is connected with the object side surface and the image side surface, the lens barrel accommodates the plastic optical lens element, the lens barrel comprises a disc-shaped part and a side wall part, the disc-shaped part is provided with a light through hole, an optical axis of the imaging lens passes through the light through hole, the side wall part corresponds to the outer diameter surface of the plastic optical lens element, the light absorbing coating is provided with an inner side surface and an outer side surface, the inner side surface is fixed on the outer diameter surface of the plastic optical lens element, the outer side surface is opposite to the inner side surface and is far away from the outer diameter surface of the plastic optical lens element, and the outer side surface contacts the side wall part of the lens barrel. The invention also discloses a camera module with the imaging lens and an electronic device with the camera module.

Inventors

Cheng Junjia
SU HENGYI
ZHOU MINGDA
HUANG CHENGYI

Assignees

大立光电股份有限公司

Dates

Publication Date: 20260505
Application Date: 20210401
Priority Date: 20210209

Claims (14)

1. An imaging lens, wherein the imaging lens has an object side, an image side and an optical axis, the position of the image side is opposite to the position of the object side, the optical axis passes through the object side and the image side, the imaging lens comprises: a plastic optical lens element having: an object side surface facing the object side of the imaging lens; An image side surface facing the image side of the imaging lens, and An outer diameter surface connecting the object side surface and the image side surface; A lens barrel having an inner space accommodating the plastic optical lens element, the lens barrel comprising: a disk-shaped part having a light-passing hole through which the optical axis of the imaging lens passes, and A side wall part connected with the disk part and corresponding to the outer diameter surface of the plastic optical lens element, and A light absorbing coating fixed to the outer diameter surface of the plastic optical lens element and in physical contact with the barrel, the light absorbing coating having: an inner side surface facing and fixed to the outer diameter surface of the plastic optical lens element, and An outer surface located opposite to the inner surface, the outer surface being farther from the outer diameter surface of the plastic optical lens element than the inner surface, and the outer surface being in physical contact with the side wall portion of the lens barrel; Wherein a length of the outer side surface of the light absorbing coating in physical contact with the side wall portion of the lens barrel in a direction substantially parallel to the optical axis is LA, and a length of the inner side surface of the light absorbing coating in a direction substantially parallel to the optical axis is LT, which satisfies the following condition: 0.1≤LA/LT≤0.87。
2. the imaging lens as claimed in claim 1, wherein the plastic optical lens element includes at least one axial connection structure located on at least one of the object side surface and the image side surface, and the at least one axial connection structure is used for connecting an adjacent optical element and aligning the optical element with the optical axis.
3. The imaging lens as claimed in claim 2, wherein the light absorbing coating extends from the outer diameter surface of the plastic optical lens element to the at least one axial connection structure, and the inner side surface of the light absorbing coating is fixed to the at least one axial connection structure.
4. The imaging lens as claimed in claim 1, wherein the light absorbing coating extends from the outer diameter face of the plastic optical lens element to the object side surface and the image side surface, and the inner side surface of the light absorbing coating is fixed to the object side surface and the image side surface.
5. The imaging lens as claimed in claim 1, wherein the light absorbing coating extends from the outer diameter surface of the plastic optical lens element to one of the object side surface and the image side surface, and the inner side surface of the light absorbing coating is fixed to the one of the object side surface and the image side surface.
6. The imaging lens as claimed in claim 1, wherein said light absorbing coating extends from said outer diameter surface of said plastic optical lens element and is fixed to at least one of said object side surface and said image side surface, a minimum thickness of said light absorbing coating on a side fixed to said outer diameter surface of said plastic optical lens element is dA1, and a thickness of said light absorbing coating on a side fixed to said object side surface or said image side surface of said plastic optical lens element is dC, which satisfies the following condition: 0.97<dA1/dC≤2.5。
7. the imaging lens as claimed in claim 6, wherein said minimum thickness of said light absorbing coating on said side fixed to said outer diameter surface of said plastic optical lens element is dA1, a maximum thickness of said light absorbing coating on said side fixed to said outer diameter surface of said plastic optical lens element is dA2, a difference between said maximum thickness dA2 and said minimum thickness dA1 is Δda, and said thickness of said light absorbing coating on said side fixed to said object side surface or said image side surface of said plastic optical lens element is dC, which satisfies the following condition: 0.03<ΔdA/dC<0.79。
8. The imaging lens as claimed in claim 1, wherein a minimum thickness dA1 of said light absorbing coating on a side fixed to said outer diameter surface of said plastic optical lens element, a maximum thickness dA2 of said light absorbing coating on said side fixed to said outer diameter surface of said plastic optical lens element, and a difference between said maximum thickness dA2 and said minimum thickness dA1 is Δda, which satisfies the following condition: 0.1 micron < ΔdA < dA1.
9. The imaging lens as claimed in claim 8, wherein said minimum thickness of said light absorbing coating on said side fixed to said outer diameter of said plastic optical lens element is dA1, said maximum thickness of said light absorbing coating on said side fixed to said outer diameter of said plastic optical lens element is dA2, and a difference between said maximum thickness dA2 and said minimum thickness dA1 is Δda, which satisfies the following condition: 0.03<ΔdA/dA1<0.99。
10. The imaging lens as claimed in claim 1, wherein said light absorbing coating extends from said outer diameter surface of said plastic optical lens element and is fixed to at least one of said object side surface and said image side surface, and said outer side surface of said light absorbing coating fixed to said at least one of said object side surface and said image side surface of said plastic optical lens element is in physical contact with an adjacent optical element.
11. The imaging lens as claimed in claim 1, wherein said plastic optical lens element has a reduced surface on a side near said outer diameter surface, said reduced surface is connected to said outer diameter surface, a distance between said reduced surface and said optical axis is smaller than a distance between said outer diameter surface and said optical axis, and said plastic optical lens element includes a molding mark on said reduced surface.
12. The imaging lens as claimed in claim 11, further comprising an auxiliary light absorbing coating, wherein the auxiliary light absorbing coating has an inner side surface and an outer side surface, the inner side surface of the auxiliary light absorbing coating is fixed to the molding mark, and the outer side surface of the auxiliary light absorbing coating is not in physical contact with the lens barrel.
13. A camera module, the camera module comprising: the imaging lens as claimed in claim 1.
14. An electronic device, the electronic device comprising: the camera module of claim 13, and The electronic photosensitive element is arranged on an imaging surface of the imaging lens.

Description

Imaging lens, camera module and electronic device The application relates to a divisional application, the application date of the original application is 2021, 4 months and 1 days, the application number is 202110355732.2, and the application is an imaging lens, a camera module and an electronic device. Technical Field The present invention relates to an imaging lens, a camera module and an electronic device, and more particularly to an imaging lens and a camera module suitable for an electronic device. Background With the advancement of semiconductor technology, the performance of the electronic photosensitive device is improved, and the pixels can be made to have smaller sizes, so that an optical lens with high imaging quality is considered to be an indispensable feature. Along with the technological change, the electronic device equipped with the optical lens has a wider application range, and the requirements for the optical lens are more diversified. Because the conventional optical lens is less likely to be balanced between requirements such as imaging quality or assembly qualification rate, the invention provides an optical lens which meets the requirements. Disclosure of Invention The invention provides an imaging lens, a camera module and an electronic device. When meeting specific conditions, the imaging lens provided by the invention can meet the requirements of high imaging quality and high assembly qualification rate. An imaging lens provided by an embodiment of the present invention has an object side, an image side, and an optical axis; the position of the image side is opposite to the position of the object side; the optical axis passes through the object side and the image side, the imaging lens comprises a plastic optical lens element, a lens barrel and a light absorbing coating, the plastic optical lens element is provided with an object side surface, an image side surface and an outer diameter surface, the object side surface faces the object side of the imaging lens, the image side surface faces the image side of the imaging lens, the outer diameter surface is connected with the object side surface and the image side surface, the lens barrel is provided with an inner space, the inner space accommodates the plastic optical lens element, the lens barrel comprises a disc-shaped part and a side wall part, the disc-shaped part is provided with a light through hole, the optical axis of the imaging lens passes through the light through hole, the side wall part is connected with the disc-shaped part, the side wall part corresponds to the outer diameter surface of the plastic optical lens element, the light absorbing coating is fixed on the outer diameter surface of the plastic optical lens element and is in physical contact with the lens barrel, the inner side surface faces and is fixed on the outer diameter surface of the plastic optical lens element, the outer diameter surface is opposite to the inner side surface, and the outer side surface is far away from the outer diameter surface of the plastic optical lens element, the outer side surface is in physical contact with the side wall part of the lens element, the side wall part of the absorbing coating and the outer side surface and the side surface of the light absorbing coating is in a length parallel to the direction of the optical axis on the side of the lens barrel is in the physical parallel to the physical length of the optical axis on the physical side of the optical axis: 0.1≤LA/LT≤0.95。 Another embodiment of the present invention provides a camera module including the above-mentioned imaging lens. An electronic device according to another embodiment of the present invention includes the camera module and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on an imaging surface of an imaging lens. The light absorbing coating is fixed on the outer diameter surface of the plastic optical lens element, so that the light absorbing coating is physically contacted with the side wall part of the lens barrel, and when LA/LT meets the conditions, the intensity of reflection of non-imaging light on the outer diameter surface can be reduced, so that the imaging quality is improved. In addition, in the process of assembling the imaging lens, the clearance between the outer diameter surface of the plastic optical lens element and the lens barrel can be provided for matching and adjusting the margin through the thickness of the light absorbing coating in physical contact with the lens barrel, so that the assembly qualification rate is improved. The foregoing description of the invention and the following description of embodiments are provided to illustrate and explain the principles of the invention and to provide further explanation of the invention as claimed. Drawings The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit