CN110426809B

CN110426809B - Focusing method of optical lens

Info

Publication number: CN110426809B
Application number: CN201910657377.7A
Authority: CN
Inventors: 陈善斌; 程北如; 李海龙
Original assignee: Kunshan Q Technology Co Ltd
Current assignee: Kunshan Q Technology Co Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2022-10-25
Anticipated expiration: 2039-07-19
Also published as: CN110426809A

Abstract

The invention provides an optical lens focusing method, which comprises the following steps: clamping the optical lens on a focusing tool, rotating the focusing tool towards a first direction, wherein the optical lens crosses the position with the optimal imaging effect in the process, and the rotation angle of the focusing tool after crossing the position with the optimal imaging effect is A; reversely rotating the focusing tool in the direction opposite to the first direction to a position where the optical lens crosses the optimal imaging effect again, wherein the reverse rotation angle of the focusing tool is B; and rotating the focusing tool towards the first direction again, wherein the rotation angle of the focusing tool is F = B-A. In the optical lens focusing method, the focusing tool rotates forwards again after rotating reversely, so that the fixed occlusion clearance and the error between the focusing tool and the left and right walls of the lens can be mutually offset in the forward rotation and the reverse rotation of the focusing tool, and the focusing precision is improved.

Description

Focusing method of optical lens

Technical Field

The invention relates to the technical field of optical lens focusing, in particular to an optical lens focusing method.

Background

With the progress of science and technology, the application of camera modules is more and more extensive, and at present, except cameras, mobile phones, computers and other electronic equipment are equipped with camera modules, so that people can take pictures at any time and any place conveniently, and convenience and fun are brought to the life of people.

After the optical lens is assembled, focusing is required to stop the optical lens at the position with the best resolving power, namely, the position with the clearest image. When focusing, generally, an optical lens is placed in a focusing tool, and the focusing tool rotates to drive the optical lens to rotate. At present, after a focusing tool is occluded with the left wall of an optical lens to find an initial center (namely the peak of the analytic force), the focusing tool is continuously rotated by a certain angle A, and a system judges that the analytic force descends for three times, namely, the system judges that the peak of the analytic force is crossed, and the system needs to rotate back to the peak of the analytic force. When the focusing tool rotates, the focusing tool bites the right wall of the optical lens in the opposite direction, and an angle C exists between the right wall and the left wall, so that the rotating angle B = A + C is required. However, due to the errors such as abrasion between the focusing tool and the optical lens, an angle error of ± X exists during the rotation, so that the actual angle of the rotation of the focusing tool is a + C ± X, that is, the position to which the lens actually returns is not the position of the highest point of the initial resolving power, but is left or right of the highest point of the resolving power. Thereby causing inaccurate focusing.

The foregoing description is provided for general background information and does not necessarily constitute prior art.

Disclosure of Invention

The invention aims to provide an optical lens focusing method with accurate focusing.

The invention provides a focusing method of an optical lens, which comprises the following steps:

clamping the optical lens on the focusing tool, and rotating the focusing tool towards a first direction, wherein the optical lens crosses the optimal imaging effect position in the process, and the rotating angle of the focusing tool after crossing the optimal imaging effect position is A;

reversely rotating the focusing tool in the direction opposite to the first direction to a position where the optical lens crosses the optimal imaging effect again, wherein the reverse rotation angle of the focusing tool is B;

and rotating the focusing tool towards the first direction again, wherein the rotation angle of the focusing tool is F = B-A.

In one embodiment, when the focusing tool rotates by an angle a in the first direction, the optical lens stops rotating continuously when the obtained optical lens imaging effect decreases n times, where n is a positive integer greater than or equal to 1.

In one embodiment, n =3.

In one embodiment, when the focusing tool is rotated in the reverse direction opposite to the first direction, the actual rotation angle of the optical lens is greater than the actual rotation angle of the optical lens when the focusing tool is rotated by the angle a.

In one embodiment, the imaging effect of the optical lens is an analytic force score.

In the optical lens focusing method, the focusing tool rotates forwards again after rotating reversely, so that the fixed occlusion clearance and the error between the focusing tool and the left and right walls of the lens can be mutually offset in the forward rotation and the reverse rotation of the focusing tool, and the focusing precision is improved.

Drawings

Fig. 1 is a flowchart of an optical lens focusing method according to an embodiment of the invention.

Detailed Description

The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

Referring to fig. 1, a method for focusing an optical lens according to an embodiment of the present invention includes the following steps:

and S11, clamping the optical lens on the focusing tool, rotating the focusing tool in the forward direction, wherein the optical lens crosses the position with the optimal imaging effect in the process, and the rotation angle of the focusing tool after the optimal imaging effect is crossed is A.

Specifically, when judging whether the optical lens crosses the position with the optimal imaging effect, the imaging effect of the optical lens can be acquired, and when the acquired imaging effect of the optical lens is reduced, the imaging effect of the previous time can be judged to be optimal, and the software can acquire the optimal imaging effect. The imaging effect of the optical lens can be represented as a value of the resolving power, and the position with the best imaging effect is represented as a highest point of the resolving power. In the process of rotating the focusing tool, the imaging effect of the optical lens is continuously obtained, and generally, data of the imaging effect of the optical lens is obtained at certain time intervals.

In this embodiment, the focusing tool is rotated in the forward direction until the obtained optical lens imaging effect decreases n times, where n is a positive integer greater than or equal to 1. Specifically, in the present embodiment, n =3.

And S13, reversely rotating the focusing tool to a position where the optical lens crosses the optimal imaging effect again, wherein the reverse rotation angle of the focusing tool is B.

In this embodiment, during the forward rotation, the left wall of the focusing tool engages with the optical lens, and during the reverse rotation, the right wall of the focusing tool engages with the optical lens, so that there is a rotation angle difference C during the reverse rotation, and meanwhile, because there is an angle error ± X due to the abrasion between the focusing tool and the optical lens, and so on, the reverse rotation is performed to the position with the optimal imaging effect, and the angle to be rotated is a + C ± X, so the actual angle to be rotated to the position where the reverse rotation of the focusing tool passes the optimal imaging effect again needs to be greater than a + C ± X, and the value of B can be determined according to this. Due to the existence of the error, when the rotation angle B is reversed, the actual rotation angle is B + C +/-X.

And S15, rotating the focusing tool forward again, wherein the rotation angle of the focusing tool is F = B-A, and rotating the optical lens to the optimal imaging position.

At this time of forward rotation, the actual rotation angle is F + C ± X, also due to the presence of an error. In this way, the actual total rotation angle of the two positive rotations is A + F + C + -X, and the actual rotation angle of the reverse rotation is B + C + -X, so that the fixed occlusion gap and the error between the focusing tool and the left and right walls of the lens are mutually offset in the positive rotation and the reverse rotation of the focusing tool, and the focusing precision is improved.

It will be appreciated that the above method is equally applicable to focus tool engagement with an optical lens without a difference in engagement of the left and right walls. The forward rotation and the reverse rotation in this embodiment are opposite, and the reverse rotation and then the forward rotation are the same.

In the drawings, the size and relative sizes of layers and regions may be exaggerated for clarity. It will be understood that when an element such as a layer, region or substrate is referred to as being "formed on," "disposed on" or "located on" another element, it can be directly on the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly formed on" or "directly disposed on" another element, there are no intervening elements present.

In this document, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed and removable connections as well as integral connections; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms can be understood in a specific case to those of ordinary skill in the art.

In this document, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for the purpose of clarity and convenience of description of the technical solutions, and thus, should not be construed as limiting the present invention.

As used herein, the ordinal adjectives "first", "second", etc., used to describe an element are merely to distinguish between similar elements and do not imply that the elements so described must be in a given sequence, either temporally, spatially, in ranking, or in any other manner.

As used herein, the meaning of "a plurality" or "a plurality" is two or more unless otherwise specified.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims

1. An optical lens focusing method, comprising:

rotating the focusing tool towards the first direction again, wherein the rotation angle of the focusing tool is F = B-A;

when the obtained optical lens imaging effect is reduced, the last imaging effect is judged to be the best;

when the focusing tool is rotated in the first direction, the left wall of the focusing tool is engaged with the optical lens, and when the focusing tool is rotated in the direction opposite to the first direction, the right wall of the focusing tool is engaged with the optical lens.

2. The method for focusing an optical lens according to claim 1, wherein the step of determining whether the optical lens has moved beyond the position with the best imaging effect specifically comprises: and acquiring the imaging effect of the optical lens, and judging that the optical lens crosses the position with the optimal imaging effect when the acquired imaging effect of the optical lens is reduced.

3. The method of claim 2, wherein when the focusing tool is rotated in the first direction by an angle a, the continuous rotation is stopped when the obtained optical lens imaging effect decreases n times, where n is a positive integer greater than or equal to 1.

4. A method of focusing an optical lens as claimed in claim 3, wherein n =3.

5. A method of focusing an optical lens as claimed in claim 1, wherein when the focusing tool is rotated in a direction opposite to said first direction, the actual angle of rotation of the optical lens is greater than when the focusing tool is rotated through angle a.

6. The method of claim 2, wherein the imaging effect of the optical lens is an analytic force score.