CN111352251A - Optical height fixing method and optical height fixing system of lens holder assembly - Google Patents
Optical height fixing method and optical height fixing system of lens holder assembly Download PDFInfo
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- CN111352251A CN111352251A CN201811569880.9A CN201811569880A CN111352251A CN 111352251 A CN111352251 A CN 111352251A CN 201811569880 A CN201811569880 A CN 201811569880A CN 111352251 A CN111352251 A CN 111352251A
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- transfer function
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/62—Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems
Abstract
An optical height-fixing method of a lens holder assembly and an optical height-fixing system thereof are provided, wherein the optical height-fixing method comprises the following steps: providing a preassembled lens holder assembly, wherein the lens holder assembly comprises a lens and a lens holder, and wherein the lens and the lens holder have a first relative positional relationship; obtaining a target image of a test target through the lens holder assembly by a camera; processing the target image to obtain a modulation transfer function value corresponding to the first relative positional relationship; adjusting the relative position relationship between the optical lens and the lens base, and obtaining modulation transfer function values corresponding to different relative position relationships to generate a corresponding relationship between the relative position relationship and the modulation transfer function values; and determining an optical height position, wherein the optical height position corresponds to the maximum value of the modulation function value in the corresponding relation between the relative position relation and the modulation function value.
Description
Technical Field
The invention relates to the field of optics, in particular to an optical height fixing method and an optical height fixing system of a lens holder assembly.
Background
In the production process of a camera module, the lens and the lens holder of the lens holder assembly are usually preassembled before focusing. In the preassembling process, the camera module is positioned to be high so as to preliminarily determine the relative position relationship between the lens and the lens holder.
The most popular method in the industry is mechanical height determination. The mechanical height-fixing method is to preliminarily determine the relative position relationship between the lens and the lens holder through the physical height of the lens holder assembly. After the machinery is decided the height, further focusing is carried out to the module of making a video recording to promote the formation of image effect of the module of making a video recording. However, this mechanical height-fixing method does not take into account the difference between different lenses, and cannot compensate for the difference between different lenses by adjusting the relative positional relationship between the lenses and the lens holder by physical height.
In actual production, the difference between the optical back focuses of different batches of lenses is large. The above-mentioned traditional mechanical height-fixing method can only adjust the mechanical back focus of the camera module, and the mechanical back focus of the camera module can not replace the optical back focus. In addition, the camera module preassembled by adopting a mechanical height-fixing method needs to be further focused to meet the imaging standard. Therefore, the traditional height fixing method is adopted to pre-assemble the camera module, so that the focusing efficiency and the production efficiency of the camera module are limited.
Accordingly, in view of the above problems, there is a need for an improved method for positioning a camera module to improve focusing efficiency and production efficiency of the camera module.
Disclosure of Invention
An object of the present invention is to provide an optical height setting method of a lens holder assembly and an optical height setting system thereof, in which a relative positional relationship between the lens and the lens holder can be determined based on an imaging effect by the optical height setting method so that the optical height setting method is not affected by an optical back focus of the lens holder assembly.
Another objective of the present invention is to provide an optical height-fixing method for a lens holder assembly and an optical height-fixing system thereof, wherein the optical height-fixing method can improve the height-fixing precision of the lens holder assembly, and improve the focusing efficiency of the subsequent camera module.
Another object of the present invention is to provide an optical height-fixing method and system for lens holder assembly, which is suitable for different kinds of lens holder assemblies.
In order to achieve at least one of the above objects, the present invention provides an optical height-fixing method for a lens holder assembly, including:
providing a preassembled lens holder assembly, wherein the lens holder assembly comprises a lens and a lens holder, and wherein the lens and the lens holder have a first relative positional relationship;
obtaining a target image of a test target through the lens holder assembly by a camera;
processing the target image to obtain a modulation transfer function value corresponding to the first relative positional relationship;
adjusting the relative position relationship between the optical lens and the lens base, and obtaining modulation transfer function values corresponding to different relative position relationships to generate a corresponding relationship between the relative position relationship and the modulation transfer function values; and
an optical height setting position is determined, wherein the optical height setting position corresponds to the maximum value of the modulation function value in the corresponding relation between the relative position relation and the modulation function value.
In one embodiment of the present invention, an optical height position is determined, comprising the steps of: acquiring optical back focus data of the lens seat assembly based on different relative position relations;
fitting a corresponding curve between the generated back focus data and the modulation transfer function value based on the optical back focus data and the modulation transfer function value of the lens holder assembly with different relative position relationships, wherein the corresponding curve represents the corresponding relationship between the relative position relationship and the modulation transfer function value; and
and determining calibrated focal data corresponding to the maximum value of the modulation transfer function value in a corresponding curve between the relative position and the modulation transfer function value, wherein the relative position relation corresponding to the calibrated focal data is the optical height position between the lens and the lens base.
In an embodiment of the invention, the test target is accommodated in a collimator, and the collimator is coaxially disposed with the lens holder assembly.
In another aspect of the present invention, the present invention further provides an optical height-setting system, comprising:
a test target;
a camera for capturing a target image of the test target through the pre-assembled lens holder assembly, wherein the lens holder assembly comprises a lens and a lens holder, and the lens has a first relative position relationship with the lens holder;
the actuating module is used for adjusting the relative position relationship between the lens and the lens base; and
a processing module, communicatively coupled to the camera, for processing the acquired reticle image to acquire modulation transfer function values of the reticle image corresponding at different relative positions, and for generating a correspondence between a relative position and a modulation transfer function value, and for determining a relative positional relationship corresponding to a maximum value of the modulation transfer function among the correspondences between the relative position and the modulation transfer function value as an optical height position between the lens and the lens mount.
In an embodiment of the invention, the optical height-fixing system further includes at least one magnifying lens set disposed between the camera and the lens holder assembly, and configured to magnify a virtual image of the test target in the lens holder assembly.
In an embodiment of the invention, the optical height-fixing system further includes a collimator, wherein the test target is accommodated in the collimator.
In an embodiment of the invention, the system further includes an adjusting platform for adjusting optical axes of the at least one magnifying lens and the camera, so that the lens holder assembly, the at least one magnifying lens and the camera are coaxially disposed.
Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.
These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the claims.
Drawings
FIG. 1 is a block diagram of an optical height-setting method according to a preferred embodiment of the present invention.
FIG. 2 illustrates a corresponding plot of the correspondence between the modulation transfer function values of the reticle image and the optical back focus of the lens holder assembly.
FIG. 3 is a schematic diagram of an optical height-setting system according to a preferred embodiment of the present invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.
It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.
It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.
As described above, in the production process, before focusing a lens holder assembly, a lens and a lens holder of the lens holder assembly need to be pre-assembled. During the pre-assembly process, the lens and the lens holder need to be positioned high in the pre-assembly process, that is, the relative position relationship between the lens and the lens holder for obtaining the best imaging effect is preliminarily determined. In a conventional mechanical height-setting method, the physical height of the lens-holder assembly is used as a set of height-setting parameters. For convenience of description, the distance from the top of the lens barrel to the bottom of the lens holder of the lens is defined as a mechanical back focus (that is, the physical height of the lens holder assembly), and the relative position relationship between the lens and the lens holder is adjusted by the mechanical back focus.
However, in actual production, mechanical back focus does not replace optical back focus. That is, even if the mechanical back focus of the camera module reaches the standard, the lens and the lens holder which are preassembled need to be further focused to enable the camera module to have the best imaging effect. In order to improve the production efficiency and the focusing efficiency, the fixed height precision of the camera module needs to be further improved.
Therefore, aiming at the defects of the mechanical height setting method, the invention provides an optical height setting method, in the height setting process, the imaging effect of the lens base at different relative positions is evaluated by adopting a modulation transfer function, and when the imaging effect of a camera module is optimal, the relative position relation of the lens and the lens base is determined so as to obtain the optical height setting position of the lens base assembly.
A block diagram of an optical height-setting method according to a preferred embodiment of the present invention is illustrated in fig. 1. The optical height determining method 100 includes: providing a preassembled lens holder assembly, wherein the lens holder assembly comprises a lens and a holder, wherein the lens and the holder have a first relative positional relationship 101 therebetween; obtaining a target image 102 of a test target through the lens holder assembly by a camera; processing the target image to obtain a modulation transfer function value 103 corresponding to the first relative positional relationship; adjusting the relative position relationship between the optical lens and the lens holder, and obtaining modulation transfer function values corresponding to different relative position relationships to generate a corresponding relationship 104 between the relative position relationship and the modulation transfer function values; and determining an optical level position, wherein the optical level position corresponds to the maximum value 105 of the modulation function value in the correspondence between the relative positional relationship and the modulation function value.
In this embodiment, the first relative positional relationship of the lens holder assembly is determined based on the physical heights of the lens and the holder. In step 101, when the lens holder assemblies have the first relative positional relationship therebetween, the optical back focus data of the lens holder assemblies based on the first relative positional relationship and the reticle image may be acquired. In addition, the lens holder assembly having the first relative positional relationship need not meet the mechanical height setting criteria.
It will be appreciated by those skilled in the art that the method of pre-assembling the lens and the lens holder by physical height, and the method of acquiring optical back focus data of the pre-assembled lens holder assembly, have been developed and the present invention will not be described herein.
In step 102, the target image is an image of a virtual image of the test target obtained by the lens holder assembly based on the first relative position. In this embodiment, the pre-assembled lens holder assembly does not include a light sensing chip, and the lens can only acquire a virtual image of the test target, so that the target image needs to be acquired by the camera.
In particular, the optical height-determining method 100 may be obtained by any hardware or device capable of acquiring an image, and the lens-holder assembly obtains the virtual image of the test target based on the first relative position, and the invention is not limited thereto.
In steps 103 and 105, first, a target image of the test target acquired by the lens holder assembly based on the first relative positional relationship is acquired. Then, the target image is processed to obtain a modulation transfer function value of the target image. The modulation transfer function value of the reticle image is related to the first relative positional relationship. However, before obtaining the correspondence between the modulation transfer function values of the target image and the relative positional relationship of the lens holder assembly, it is necessary to process and analyze the modulation transfer function values of a set of target images.
Accordingly, after obtaining the modulation transfer function value of the reticle image related to the first relative positional relationship, the relative positional relationship between the lens and the lens holder needs to be adjusted to obtain a set of modulation transfer function values, where a set of the modulation transfer function values corresponds to different relative positional relationships between the lens and the lens holder.
Step 105 includes: acquiring optical back focus data 1051 of the lens seat assembly based on different relative position relations; fitting a correspondence curve between the generated back focus data and the modulation transfer function value based on the optical back focus data of the lens holder assembly and the modulation transfer function value in different relative positional relationships, wherein the correspondence curve represents a correspondence relationship 1052 between the relative positional relationship and the modulation transfer function value; and determining calibrated focus data corresponding to the maximum value of the modulation transfer function value in a corresponding curve between the relative position and the modulation transfer function value, wherein the relative position relation corresponding to the calibrated focus data is the optical height position 1053 between the lens and the lens base.
In a possible implementation manner of this embodiment, a set of optical back focus data when the lens holder assembly is based on different relative position relationships is obtained first, and then the corresponding curve is generated by a fitting manner based on the set of optical back focus data and the set of modulation transfer function values, as shown in fig. 2. The corresponding curve represents the relationship between the back focus of the lens holder assembly and the modulation transfer function value of the reticle image. And finally, selecting optical back focus data corresponding to the maximum value of the modulation transfer function values in the corresponding curve, and determining the optical height position based on the selected optical back focus data.
It will be appreciated by those skilled in the art that the lens holder assembly provides the best imaging performance when the modulation transfer function of the reticle image reaches a maximum value, while the relative position of the lens holder meets the optical height determination criteria. Therefore, the relative position of the lens and the lens holder corresponding to the maximum value of the modulation transfer function value is the optical height position.
In another possible implementation manner of this embodiment, after obtaining a set of modulation transfer function values, a maximum value of the modulation transfer function may be directly selected, and then, based on the maximum value, a relative position relationship of the lens holder assembly corresponding to the maximum value of the modulation transfer function is determined.
In other words, the imaging effect of the lens holder at different relative positions is obtained by adjusting the relative position between the lens and the lens holder, and when the imaging effect of the lens holder is optimal, the fixed-height position between the lens and the lens holder is determined, wherein the imaging effect of the lens holder assembly is evaluated by the modulation transfer function value of the reticle image.
Preferably, the optical height-fixing method determines the optical height-fixing position by determining the optimal imaging position of the lens holder assembly, and can compensate for differences between different lenses to improve the accuracy of optical height-fixing.
Compared with the mechanical height-fixing method, the height-fixing position is determined by the physical height of the lens and the lens base, and two errors mainly exist, which can cause the mismatch between the mechanical back focus and the optical back focus. One is the error caused by the difference in optical parameters between different batches of shots. The other is an error caused by the influence of the thickness of the photosensitive chip on the physical height of the lens base. In the conventional mechanical height setting method, the thickness of the photosensitive chip is ignored by default. In actual production, the thickness of the photosensitive chip is also an important factor affecting the optical back focus and the imaging effect of the lens holder assembly, so that the two errors need to be compensated in a further focusing process by using the traditional mechanical height fixing method, and the workload in the focusing process is increased.
It should be understood by those skilled in the art that the camera module comprising the lens holder assembly and the photo sensor chip can also achieve the best imaging effect when the lens holder assembly is located at the relative position for the best imaging. Therefore, the optical height-fixing method directly determines the height-fixing position through the imaging effect of the lens holder assembly without being influenced by the difference of optical parameters among different lenses and the thickness of the photosensitive chip, thereby compensating two errors in the conventional mechanical height-fixing method.
As shown in fig. 3, an optical height setting system according to a preferred embodiment of the present invention is illustrated. The optical leveling system 200 includes: a test target 10; a camera 20 for acquiring a target image of the test target 10 through a pre-assembled lens holder assembly 201, wherein the lens holder assembly 201 includes a lens 202 and a lens holder 203, and the lens 202 and the lens holder 203 have a first relative position relationship; an actuating module 30 for adjusting the relative position relationship between the lens 202 and the lens holder 203; and a processing module 40, communicatively coupled to the camera 20, for processing the acquired target image to acquire modulation transfer function values of the target image corresponding to different relative positional relationships, and for generating a correspondence between the relative positional relationship and the modulation transfer function values, and for determining a relative positional relationship corresponding to a maximum value of the modulation transfer function among the correspondences between the relative positional relationship and the modulation transfer function values as an optical height position between the lens 202 and the lens holder 203.
When the system 200 is used to optically set the height of the lens and the lens holder, first, the lens holder assembly 201 obtains a virtual image of the test target 10 based on the first relative positional relationship. The camera 20 then acquires an image of the virtual image of the test target 10 acquired by the lens mount assembly (the target image), and transmits the target image to the processing module 40, wherein the processing module 40 receives and processes the target image to acquire a modulation transfer function value of the target image, wherein the modulation transfer function value is related to the optical back focus data of the lens mount assembly 201 based on the first relative positional relationship.
The actuating module 30 is configured to adjust a relative positional relationship of the lens holder assembly 202, and in the process of adjusting the relative positional relationship, the image obtaining module 20 obtains a set of reticle images obtained by the lens holder assembly at different relative positions and transmits the set of reticle images to the processing module 40.
The processing module 40 receives and processes a set of the target image, and fits and generates a corresponding curve between the back focus data and the modulation transfer function value based on the modulation transfer function value of the set of the target image and the optical back focus data of the lens holder assembly 201 based on different relative positional relationships, where the corresponding curve represents the corresponding relationship between the relative positional relationship of the lens holder assembly 201 and the modulation transfer function value.
In a possible implementation manner of this embodiment, the processing module 40 may select the optical back focus data corresponding to the maximum value of the modulation transfer function value in the corresponding curve as a calibrated back focus data. Then, based on the calibrated focus data, determining the relative position relation corresponding to the maximum value of the modulation transfer function value, thereby determining the optical height position of the lens holder assembly.
In another possible implementation manner of this embodiment, the processing module 40 may directly select a maximum value of the modulation transfer function values, and acquire back focus data corresponding to the maximum value as the calibrated back focus data, so as to determine that a relative position relationship corresponding to the calibrated back focus data is an optical fixed-height position.
The system 200 further includes a magnifying lens assembly 50, wherein the test target 10, the lens holder assembly 201, the magnifying lens assembly 50 and the camera 20 are coaxially disposed, so that a target image of the test target 10 can be obtained by the camera 20 through the lens holder assembly 201, and a magnified target image of the test target 10 can be obtained by the magnifying lens assembly 50.
In a possible implementation manner of this embodiment, the system 200 further includes a collimator 60, which is disposed coaxially with the test target 10, the lens holder assembly 201, and the camera 10, wherein the test target 10 is accommodated in the collimator 60. In another possible implementation manner of this embodiment, the test target 10 can emit light, so that the lens holder assembly 201 can acquire a target image.
The system 200 further includes an adjustment stage 70 for adjusting the optical axes of the magnifying lens group 50 and the camera 20 such that the lens holder assembly 201, the magnifying lens group 50 and the camera 20 are coaxially disposed.
Preferably, the optical height-setting system 200 is suitable for any kind of lens holder assembly, so that the optical height-setting system 200 has better universality.
In summary, the system 200 determines the optical height position by evaluating the imaging effect of the lens holder, so that the lens holder assembly has a good imaging effect in the pre-assembly process, thereby reducing the difficulty of the post-focusing operation.
In actual production, in order to further promote the production speed and the efficiency of the camera module, the process that the camera module avoids focusing is more and more popular, that is to say, the camera module is at the in-process of preassembling, and the lens microscope base subassembly of the camera module just can reach the imaging standard to make the later stage no longer need the focusing. Therefore, the optical height fixing system can not only improve the height fixing precision of the lens holder assembly, but also improve the focusing-free success rate of the camera module.
It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.
Claims (9)
1. An optical height-fixing method for a lens holder assembly, comprising:
providing a preassembled lens holder assembly, wherein the lens holder assembly comprises a lens and a lens holder, and wherein the lens and the lens holder have a first relative positional relationship;
obtaining a target image of a test target through the lens holder assembly by a camera;
processing the target image to obtain a modulation transfer function value corresponding to the first relative positional relationship;
adjusting the relative position relationship between the optical lens and the lens base, and obtaining modulation transfer function values corresponding to different relative position relationships to generate a corresponding relationship between the relative position relationship and the modulation transfer function values; and
an optical height setting position is determined, wherein the optical height setting position corresponds to the maximum value of the modulation function value in the corresponding relation between the relative position relation and the modulation function value.
2. The optical height setting method of a lens mount assembly according to claim 1, wherein determining a relative positional relationship corresponding to a maximum value of the modulation transfer function value among the correspondence relationships between the relative position and the modulation transfer function value as an optical height setting position between the lens and the mount comprises:
acquiring optical back focus data of the lens seat assembly based on different relative position relations;
fitting a corresponding curve between the generated back focus data and the modulation transfer function value based on the optical back focus data and the modulation transfer function value of the lens holder assembly with different relative position relationships, wherein the corresponding curve represents the corresponding relationship between the relative position relationship and the modulation transfer function value; and
and determining calibrated focal data corresponding to the maximum value of the modulation transfer function value in a corresponding curve between the relative position and the modulation transfer function value, wherein the relative position relation corresponding to the calibrated focal data is the optical height position between the lens and the lens base.
3. The method for optical height determination of a lens mount assembly of claim 1, wherein the test target, the lens mount assembly, and the camera are coaxially arranged such that a target image of the test target can be acquired by the camera through the lens mount assembly.
4. The optical height setting method of a lens mount assembly of claim 3, wherein the test target is housed in a collimator, and the collimator axis is disposed coaxially with the lens mount assembly.
5. The optical height setting method of the lens holder assembly according to claim 4, wherein a magnifying lens group is further coaxially provided at the camera and the lens holder assembly for magnifying a virtual image of the test target in the lens holder assembly.
6. An optical height setting system of a lens holder assembly, comprising:
a test target;
a camera for capturing a target image of the test target through a pre-assembled lens holder assembly, wherein the lens holder assembly comprises a lens and a lens holder, and a first relative position relationship exists between the lens and the lens holder;
the actuating module is used for adjusting the relative position relationship between the lens and the lens base; and
a processing module, communicatively coupled to the camera, for processing the acquired reticle image to acquire modulation transfer function values of the reticle image corresponding at different relative positions, and for generating a correspondence between a relative position and a modulation transfer function value, and for determining a relative positional relationship corresponding to a maximum value of the modulation transfer function among the correspondences between the relative position and the modulation transfer function value as an optical height position between the lens and the lens mount.
7. The optical height setting system of a lens housing assembly of claim 6, further comprising at least one magnifying lens group disposed between the camera and the lens housing assembly for magnifying a virtual image of the test target in the lens housing assembly.
8. The optical height setting system of a lens holder assembly of claim 6, further comprising a collimator, wherein the test target is housed in the collimator.
9. The optical height setting system of a lens holder assembly of claim 6, further comprising an adjusting stage for adjusting optical axes of the at least one magnifying lens and the camera such that the lens holder assembly, the at least one magnifying lens and the camera are coaxially disposed.
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| CN201811569880.9A CN111352251A (en) | 2018-12-21 | 2018-12-21 | Optical height fixing method and optical height fixing system of lens holder assembly |
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| CN201811569880.9A CN111352251A (en) | 2018-12-21 | 2018-12-21 | Optical height fixing method and optical height fixing system of lens holder assembly |
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| CN206740364U (en) * | 2016-12-31 | 2017-12-12 | 歌尔科技有限公司 | A kind of twin-lens position detecting system |
| CN107544195A (en) * | 2016-06-23 | 2018-01-05 | 宁波舜宇光电信息有限公司 | Focus camera module and its focus control and focus adjustment method |
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| CN105445885A (en) * | 2015-10-30 | 2016-03-30 | 宁波舜宇光电信息有限公司 | Adjustable optical lens and shooting module, and manufacturing method for the adjustable optical lens and the shooting module |
| CN107544195A (en) * | 2016-06-23 | 2018-01-05 | 宁波舜宇光电信息有限公司 | Focus camera module and its focus control and focus adjustment method |
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