Adjustable optical lens and camera module and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-11867965-B2
Application number	US-202117145248-A
Country	US
Kind code	B2
Filing date	Jan 8, 2021
Priority date	Oct 30, 2015
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

An adjustable optical lens and camera module and manufacturing method thereof are provided, wherein the camera module includes an optical sensor and an adjustable optical lens. The adjustable optical lens, which is arranged in a photosensitive path of the optical sensor, includes an optical structural member and at least two lenses. Each of the lens is arranged in an internal space of the optical structural member along an axial direction of the optical structural member, wherein before packaging the adjustable optical lens and the optical sensor, at least one position of the lens in the internal space of the optical structural member is able to be adjusted, so that a central axis line of the adjustable optical lens and a central axis line of the optical sensor are coincided, so as to improve the image quality of the camera module.

First claim

What is claimed is:

1. An adjustable optical lens of a camera module comprising an optical sensor, comprising:
an optical structural member having an internal space along an axial direction thereof; and
two or more lenses, wherein said lenses are spacedly preassembled in said internal space of said optical structural member along an axial direction of said optical structural member, wherein one or more positions of at least one of said two or more lenses in said internal space of said optical structural member is able to be adjusted in horizontal direction, vertical direction, tilt direction, and peripheral direction for calibration and measured to generate a MTF (Modulation Transfer Function) value by capturing an image through said lens and the optical sensor;
wherein said optical structural member has at least one adjustment channel adapted to communicate said internal space of said optical structural member with an external environment, and said lens is arranged in said internal space of the optical structural member corresponding to said adjustment channel, so that at least one position of said lens in said internal space of said optical structural member is able to be adjusted through said adjustment channel by controlling a needle inserted into said adjustment channel; and
wherein said lenses are preassembled in said internal space of said optical structural member with an adhesive, wherein the adhesive is in a half solidified condition, wherein said adhesive is a mixed adhesive of an UV adhesive and a thermosetting adhesive, and is in the half solidified condition after ultraviolet exposure to achieve the preassembling, and wherein after a heating process, said adhesive becomes completely solidified, so as to affix said lenses.

2. The adjustable optical lens, as recited in claim 1 , wherein said MTF value is configured to represent an imaging quality of said lens, wherein said MTF value corresponding to said image needs to be calculated and said MTF value is checked to determine if said MTF value is greater than a standard based on a MTF testing chart, wherein if said MTF value is greater than or equal to said standard, said position of said lens is fixed, and that if said MTF value is lower than said standard, said position of said lens is adjusted to capture another image for calibration again, wherein a center axis line of said adjustable optical lens and a center axis line of the optical sensor are coincided by adjusting said at least one of said lenses in said internal space of said optical structural member, and said adjustable optical lens and the optical sensor are packaged to fix a relative position between said lenses and the optical sensor.

3. The adjustable optical lens, as recited in claim 1 , further comprising an aperture member which is installed on top of said optical structural member and aligned with said lenses along a photosensitive path and is adapted to be adjustably arranged.

4. The adjustable optical lens, as recited in claim 3 , wherein a position of said aperture member is arranged, with respect to said optical structural member, to be adjusted in at least one direction.

5. The adjustable optical lens, as recited in claim 1 , wherein after said lens of said adjustable optical lens is adjusted in position, an adhesive is applied to fix said lens in said optical structural member, wherein said adjustment channel is sealed by said adhesive after the calibration.

6. The adjustable optical lens, as recited in claim 1 , wherein one of said lenses in said internal space of said optical structural member is arranged adjustable while another said lens is fixed in position in said internal space of said optical structural member.

7. The adjustable optical lens, as recited in claim 1 , wherein all of said lenses in said internal space of said optical structural member are arranged in adjustable manner.

8. A manufacturing method of a camera module, comprising the steps of:
(a) arranging the adjustable optical lens according to claim 1 in a photosensitive path of an optical sensor of an optical device;
(b) preassembling at least an adjustable optical element in said adjustable optical lens to complete a preassembly of said camera module;
(c) capturing an imaging through said adjustable optical lens after preassembled by shooting a MTF testing chart with said camera module which is powered on after preassembled and said optical sensor and adjusting an assembling position of said adjustable optical element to make an imaging of said camera module after adjusted meet a resolution requirement; and
(d) fixing a relative position between said adjustable optical element and said optical sensor and packaging said adjustable optical lens and said optical device to form said camera module.

9. The method, as recited in claim 8 , wherein, in the step (c), a MTF value is applied to represent an imaging quality of said camera module, wherein a greater MTF value indicates a higher imaging quality of said camera module, wherein when said imaging of said camera module is captured each time, said MTF value corresponding to said imaging needs to be calculated and said MTF value is checked to determine if said MTF value is greater than a standard, wherein if said MTF value is greater than or equal to said standard, said capturing is completed, and that if said MTF value is lower than said standard, another capturing is required.

10. The method, as recited in claim 9 , wherein said adjustable optical element is a lens, wherein in the step (b), said lens is preassembled in said adjustable optical lens as a preassembled lens, wherein by adjusting said assembling position of said preassembled lens, a central axis line of said adjustable optical lens and a central axis line of said optical sensor are adjusted to coincide or be within an allowable range of deviation therebetween.

11. The method, as recited in claim 10 , wherein a side wall of an optical structural member of said adjustable optical lens has at least one adjustment channel provided therein to connect an internal space of said optical structural member to an external environment, wherein said lens be preassembled in said internal space of said optical structural member corresponding to said adjustment channel is adaptable to adjust a position thereof inside said optical structural member through said adjustment channel.

12. The method, as recited in claim 11 , wherein, the step (d) further comprises the steps of sealing said adjustable channel by dispensing an adhesive in said adjustable channel; and solidifying said adhesive for preassembling said adjustable optical element in the step (b) and for sealing said adjustable channel by conducting a heating process, so that said lens after adjustment is fixed in position and said camera module is made.

13. The method, as recited in claim 10 , wherein said assembling position of said adjustable optical element is adjusted through adjusting at least a direction of horizontal direction, vertical direction, tilt direction, and peripheral direction of said adjustable optical element.

14. The method, as recited in claim 9 , wherein said adjustable optical element is an aperture member, wherein in the step (b), said aperture member is preassembled on top of said adjustable optical lens, wherein by adjusting said assembling position of said aperture member, a central axis line of said adjustable optical lens and a central axis line of said optical sensor are adjusted to be coincided or be within an allowable range of deviation therebetween.

15. The method, as recited in claim 9 , wherein said adjustable optical element includes a

Assignees

• Ningbo Sunny Opotech Co Ltd

Inventors

• Wang Mingzhu
• Zhao Bojie
• Ding Liang
• Liu Chunmei
• Chen Feifan
• Guo Nan
• Jiang Heng

Classifications

• H10F39/804

  Containers or encapsulations · CPC title

• G02B7/003 Primary

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

• B29C65/7802

  Positioning the parts to be joined, e.g. aligning, indexing or centring · CPC title

• G02B7/006

  Filter holders · CPC title

• G02B7/021

  for more than one lens · CPC title