Optical lens, manufacturing method of optical lens, and camera module

Patent metadata

Field	Value
Publication number	US-12468113-B2
Application number	US-202017640526-A
Country	US
Kind code	B2
Filing date	Aug 28, 2020
Priority date	Sep 5, 2019
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

An optical lens ( 1 ), comprising a first lens ( 100 ) and a lens assembly ( 110 ). The first lens ( 100 ) includes a first optical area ( 101 ) and a first structural area ( 102 ) surrounding the first optical area ( 101 ), and the first structure area ( 102 ) includes a height measurement area ( 103 ) not coated with an anti-reflective coating. The lens assembly ( 110 ) includes a lens barrel ( 104 ) and at least one second lens ( 105 ) disposed in the lens barrel ( 104 ). The at least one second lens ( 105 ) includes a second optical area ( 106 ) and a second structural area ( 107 ) surrounding the second optical area ( 106 ). The first structural area ( 102 ) is connected to an end face ( 109 ) of the lens barrel ( 104 ) near the first lens ( 100 ) or the second structural area ( 107 ) of the second lens ( 105 ) closest to the first lens ( 100 ). A manufacturing method of optical lens ( 1 ) and a camera module are also disclosed.

First claim

The invention claimed is:

1 . An optical lens, wherein the optical lens comprises:
a first lens, including a first optical area and a first structural area surrounding the first optical area, wherein the first structural area includes a height measurement area not coated with an anti-reflective coating, and the height measurement area and an area of the first structural area at an inner side of the height measurement area constitute a planar area together; and a lens assembly, including a lens barrel and at least one second lens disposed in the lens barrel, wherein the at least one second lens includes a second optical area and a second structural area surrounding the second optical area, wherein the first structural area is connected to an end face of the lens barrel near the first lens or the second structural area of the second lens closest to the first lens.

2 . The optical lens according to claim 1 , wherein the height measurement area is an annular planar area.

3 . The optical lens according to claim 2 , wherein a length of the annular planar area in an axial direction of the first lens is 0.2 mm or more.

4 . The optical lens according to claim 1 , wherein the height measurement area includes at least three sections of planar area spaced apart from each other.

5 . The optical lens according to claim 4 , wherein a length of the planar area in an axial direction of the first lens is 0.2 mm or more, and a length of the planar area along a peripheral direction of the first lens is 0.5 mm or more.

6 . The optical lens according to claim 1 , wherein the height measurement area is coated with a reflective coating.

7 . The optical lens according to claim 1 , wherein the height measurement area is located on a side of the first lens facing away from the lens assembly.

8 . The optical lens according to claim 1 , wherein the height measurement area is located on a side of the first lens close to the lens assembly.

9 . The optical lens according to claim 1 , wherein a roughness of the height measurement area is smaller than a roughness of other areas of the first structural area.

10 . The optical lens according to claim 1 , wherein the height measurement area is located at an outer edge of the first lens.

11 . A manufacturing method of an optical lens, wherein the manufacturing method comprises:
obtaining a first posture of a first lens based on a ranging beam reflected by a height measurement area of the first lens not coated with an anti-reflective coating, wherein the first lens includes a first optical area and a first structural area surrounding the first optical area, and the first structural area includes the height measurement area, and the height measurement area and an area of the first structural area at an inner side of the height measurement area constitute a planar area together; adjusting an angle of the first lens according to the first posture, so that there is a relative inclination angle between the first lens and the lens assembly within a predetermined threshold; pre-positioning the first lens, the lens assembly and a photosensitive assembly so that an image formed through the first lens and the lens assembly can be obtained on the photosensitive assembly; actively aligning a relative position of the first lens and the lens assembly based on the formed image; and fixing the first lens to the lens assembly based on the actively aligned relative position of the first lens and the lens assembly.

12 . The manufacturing method according to claim 11 , wherein the height measurement area is an annular planar area, and a length of the annular planar area in an axial direction of the first lens is 0.2 mm or more.

13 . The manufacturing method according to claim 11 , wherein the height measurement area includes at least three sections of planar area spaced apart from each other.

14 . The manufacturing method according to claim 13 , wherein a length of the planar area in an axial direction of the first lens is 0.2 mm or more, and a length of the planar area along a peripheral direction of the first lens is 0.5 mm or more.

15 . The manufacturing method according to claim 11 , wherein a roughness of the height measurement area is smaller than a roughness of adjacent areas of the height measurement area.

16 . The manufacturing method according to claim 11 , wherein said adjusting the angle of the first lens according to the first posture comprises:
obtaining a second posture of the lens assembly based on the ranging beam reflected by the lens assembly; and adjusting the angle of the first lens according to the first posture and the second posture, so that there is a relative inclination angle between the first lens and the lens assembly within the predetermined threshold.

17 . The manufacturing method according to claim 11 , wherein the manufacturing method further comprises:
coating a reflective coating in the height measurement area.

18 . The manufacturing method according to claim 11 , wherein the manufacturing method further comprises:
by controlling an evaporation angle of an evaporation source, coating the anti-reflective coating only in the first optical area and a part of the first structural area other than the height measurement area.

19 . The manufacturing method according to claim 11 , wherein the manufacturing method further comprises:
by disposing a mask between the height measurement area and an evaporation source, coating the anti-reflective coating only in the first optical area and a part of the first structural area other than the height measurement area.

20 . A camera module, wherein the camera module comprises:
the optical lens according to claim 1 ; a lens holder, to which the optical lens is fixed, wherein the lens holder includes an opening aligned with a lens of the optical lens; a filter fixed to the opening; a substrate, to which the lens holder is fixed; and a photosensitive component fixed on the substrate and enclosed by the lens holder and the filter.

Assignees

• Ningbo Sunny Opotech Co Ltd

Inventors

• Mei Zhewen
• Pei Haipeng
• Tanaka Takehiko
• Lin Renkang
• Li Hui
• Wang Lei

Classifications

• G02B1/11

  Anti-reflection coatings · CPC title

• G02B7/003

  Alignment of optical elements (G02B7/001, G02B7/002 take precedence; for mirrors G02B7/1822) · CPC title

• G02B27/62

  Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems · CPC title

• G02B7/021 Primary

  for more than one lens · CPC title