CN109451237B - AA focusing method and device for camera module - Google Patents
AA focusing method and device for camera module Download PDFInfo
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- CN109451237B CN109451237B CN201811348201.5A CN201811348201A CN109451237B CN 109451237 B CN109451237 B CN 109451237B CN 201811348201 A CN201811348201 A CN 201811348201A CN 109451237 B CN109451237 B CN 109451237B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
Abstract
The invention discloses an AA focusing method and device of a camera module. The focusing AA method comprises the following steps: step 1: focusing AA is carried out on the camera module, and the relative position between a lens and a sensor in the camera module is adjusted; step 2: testing and verifying whether the clearest shooting distance of the camera module is the required preset optimal shooting distance or not, if so, performing the step 3, and otherwise, repeating the steps 1 and 2; and step 3: and fixing the relative position between the lens and the sensor in the camera module. The AA focusing method can test and verify the clearest shooting distance of the camera module subjected to AA focusing, and ensures the product quality.
Description
Technical Field
The invention relates to the field of camera shooting, in particular to an AA focusing method and device of a camera module.
Background
The camera module of the mobile phone has the clearest shooting distance, and when the distance between a shot object and the lens is the clearest shooting distance, the image obtained by the camera module (the fixed-focus module or the non-focused AF module) is clearest. After the assembly process of accomplishing the camera module, module factory meeting carries out focusing AA to the camera module, through the relative position between regulation camera lens and the sensor for the clearest shooting distance of camera module is the required predetermined best shooting distance of customer, fixes the relative position between camera lens and the sensor at last.
For the unfocusable (front) fixed focus module, the clearest shooting distance ensures that images obtained by the fixed focus module in a preset shooting range are all clear enough; for a focusable (rear) AF module, this clearest shooting distance affects the calculation speed and accuracy of the focusing algorithm of the AF module.
However, it is not guaranteed whether the clearest photographing distance of the camera module passing through the focus AA deviates from the predetermined optimal photographing distance required by the client due to an operational error or tolerance.
Disclosure of Invention
In order to solve the above-mentioned deficiencies of the prior art, the present invention provides a method and an apparatus for focusing an AA of a camera module. The AA focusing method can test and verify the clearest shooting distance of the camera module subjected to AA focusing, and ensures the product quality.
The technical problem to be solved by the invention is realized by the following technical scheme:
a focusing AA method of a camera module comprises the following steps:
step 1: focusing AA is carried out on the camera module, and the relative position between a lens and a sensor in the camera module is adjusted;
step 2: testing and verifying whether the clearest shooting distance of the camera module is the required preset optimal shooting distance or not, if so, performing the step 3, and otherwise, repeating the steps 1 and 2;
and step 3: and fixing the relative position between the lens and the sensor in the camera module.
Further, step 2 comprises:
step 2.1: previewing the camera module to a test calibration table through an optical auxiliary focusing mechanism to obtain a test calibration picture, wherein the test distance between a lens in the camera module and the test calibration table is a preset optimal shooting distance required by the camera module;
step 2.2: driving the optical auxiliary focusing mechanism to continuously change the focusing point position of the imaging light so as to simulate an optical focusing process on the camera module;
step 2.3: and judging whether the clearest shooting distance of the camera module is the testing distance between a lens in the camera module and the testing calibration table or not according to the definition change of the testing calibration picture in the simulated optical focusing process, if so, carrying out the step 3, and otherwise, repeating the step 1 and the step 2.
Further, step 2.3 comprises:
step 2.3.1: continuously acquiring the definition change of the test calibration picture in the simulated optical focusing process;
step 2.3.2: calculating a definition change curve of the test calibration picture according to the definition change of the test calibration picture;
step 2.3.3: and judging whether the clearest shooting distance of the camera module is the testing distance between a lens in the camera module and the testing calibration table or not according to the definition change curve, if so, carrying out the step 3, and otherwise, repeating the step 1 and the step 2.
Further, the optical auxiliary focusing mechanism continuously changes the focus position of the imaging light by adjusting the lens focal length or the lens position thereof.
Further, the optical auxiliary focusing mechanism comprises an adjustable lens Tlens mechanism.
A focusing AA equipment of camera module, includes:
the focusing AA module is used for focusing AA on the camera module so as to adjust the relative position between a lens and a sensor in the camera module;
the test verification module is used for testing the camera module subjected to the AA focusing so as to verify whether the clearest shooting distance of the camera module is the required preset optimal shooting distance;
and the position fixing module is used for fixing the camera module which is tested and verified so as to fix the relative position between the lens and the sensor in the camera module.
Further, the test validation module includes:
the test calibration table is used for previewing the camera module to obtain a test calibration picture, and the test distance between the test calibration picture and a lens in the camera module is a preset optimal shooting distance required by the camera module;
the optical auxiliary focusing mechanism is used for being driven to continuously change the focusing point position of imaging light when the camera module previews the test calibration table through the optical auxiliary focusing mechanism so as to simulate an optical focusing process on the camera module;
and the judging mechanism is used for judging whether the clearest shooting distance of the camera module is the testing distance between a lens in the camera module and the testing calibration table or not according to the definition change of the testing calibration picture in the simulated optical focusing process.
Further, the judging mechanism comprises a processor, and a memory and a connector which are respectively electrically connected with the processor, wherein the connector is used for connecting with the camera module to perform data interaction; the memory is stored with a test program for the processor to execute, and when the processor executes the test program, the following steps are carried out:
continuously acquiring the test calibration picture from the camera module through the connector;
calculating a definition change curve of the test calibration picture according to the definition change of the test calibration picture;
and judging whether the clearest shooting distance of the camera module is the required preset optimal shooting distance or not according to the definition change curve.
Further, the lens focal length or the lens position of the optical auxiliary focusing mechanism can be adjusted.
Further, the optical auxiliary focusing mechanism comprises an adjustable lens Tlens mechanism.
The invention has the following beneficial effects: the AA focusing method can test and verify the clearest shooting distance of the camera module subjected to AA focusing, and if the clearest shooting distance is not the preset optimal shooting distance required by a client, the AA focusing is carried out on the camera module again so as to ensure the product quality.
Drawings
FIG. 1 is a diagram of the steps of the price adjustment AA method provided by the present invention;
FIG. 2 is a diagram of step 2 of the price adjustment AA method provided by the present invention;
FIG. 3 is a schematic diagram of a test verification module in the price-adjusted AA device according to the present invention;
FIG. 4 is a schematic diagram of an adjustable lens Tlens mechanism provided by the present invention;
FIG. 5 is a first operational view of the central Tlens component of the adjustable lens Tlens mechanism;
FIG. 6 is a second operational view of the central Tlens part of the adjustable lens Tlens mechanism;
FIG. 7 is a graph of sharpness variation obtained from the test of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Example one
As shown in fig. 1, a method for focusing an AA of a camera module includes:
step 1: focusing AA is carried out on the camera module 10, and the relative position between a lens 101 and a sensor 102 in the camera module 10 is adjusted;
in step 1, a focusing AA module is used to focus an AA on the camera module 10, and the focusing AA process is a conventional process in a camera test process, and therefore, is not described in detail herein; the focusing AA module may be, but is not limited to, a camera AA tester.
The camera module 10 may be a non-focusing fixed focus module or a focusing AF module.
Step 2: testing and verifying whether the clearest shooting distance of the camera module 10 is the required preset optimal shooting distance, if so, performing the step 3, and otherwise, repeating the steps 1 and 2;
in step 2, a test verification module is used to test and verify the clearest shooting distance of the camera module 10.
The required preset optimal shooting distance is determined by the customer according to the product requirement.
Specifically, as shown in fig. 2, the step 2 includes:
step 2.1: as shown in fig. 3, previewing the camera module 10 to a test calibration table 30 through an optical auxiliary focusing mechanism 20 to obtain a test calibration picture, wherein a test distance between a lens 101 in the camera module 10 and the test calibration table 30 is a predetermined optimal shooting distance required by the camera module 10;
in step 2.1, the test verification module includes a test calibration table 30, an optical auxiliary focusing mechanism 20 and a determination mechanism, wherein,
the test calibration table 30 is used for previewing the camera module 10 to obtain a test calibration picture;
the optical auxiliary focusing mechanism 20 is configured to be driven to continuously change a focusing point position of an imaging light when the camera module 10 previews the test calibration table 30 through the optical auxiliary focusing mechanism, so as to simulate an optical focusing process on the camera module 10;
the judging mechanism is configured to judge whether the clearest shooting distance of the camera module 10 is a test distance between the lens 101 in the camera module 10 and the test calibration table 30 according to a change in the sharpness of the test calibration image in the simulated optical focusing process.
The optical auxiliary focusing mechanism 20 is located between the camera module 10 and the test calibration table 30, and an optical input end of the optical auxiliary focusing mechanism faces the test calibration pattern on the test calibration table 30, and an optical output end of the optical auxiliary focusing mechanism faces a view port on the camera module 10; the imaging light reflected by the test calibration table 30 enters the camera module 10 to form an image after passing through the optical auxiliary focusing mechanism 20, so as to form the test calibration picture.
The test calibration pattern on the test calibration table 30 for the camera module 10 to preview to obtain the test calibration picture may be a TVline test pattern, an MTF test pattern, or an SFR test pattern.
Step 2.2: driving the optical auxiliary focusing mechanism 20 to continuously change the focusing point position of the imaging light so as to simulate an optical focusing process on the camera module 10;
in step 2.2, the optical auxiliary focusing mechanism 20 continuously changes the focus position of the imaging light by adjusting the lens focal length or the lens position, that is, the optical auxiliary focusing mechanism 20 includes a zoom lens mechanism with adjustable lens focal length, such as an adjustable lens Tlens mechanism or a stretchable polymer lens mechanism, or includes a lens driving mechanism with adjustable lens position, such as a motor mechanism with an optical lens mounted thereon.
Preferably, the optical auxiliary focusing mechanism 20 includes an adjustable lens Tlens mechanism.
As shown in fig. 4, the adjustable lens Tlens mechanism includes a peripheral packaging circuit 22 and a central Tlens component 21, where the peripheral packaging circuit 22 has two pins 23 (one positive electrode and one negative electrode) for connecting to an external power supply to drive, so as to implement drive control on the central Tlens component 21; center Tlens part 21 includes glass substrate 211, high polymer 212, glass film 213 and piezoelectric film 214, set up relatively between glass substrate 211 and the glass film 213 just high polymer 212 encapsulates between the two, piezoelectric film 214 laminating is fixed in on the another side of glass film 213 and with peripheral packaging circuit 22's drive output end is connected electrically.
The working principle of the adjustable lens Tlens mechanism is as follows: when a driving voltage is supplied to the piezoelectric film 214 by using a driving chip in the peripheral packaging circuit 22, the piezoelectric film 214 vibrates to drive the glass film 213 to deform, so that the high molecular polymer 212 packaged between the glass substrate 211 and the glass film 213 is gathered, thereby generating different refractive indexes to change the position of a focusing point of imaging light, and different driving voltages can cause the high molecular polymer 212 to gather in different degrees to form different positions of the focusing point. As shown in fig. 5, when the driving chip does not supply the driving voltage to the piezoelectric film 214, the optical path is not changed when the imaging light passes through the tunable lens Tlens mechanism; as shown in fig. 6, when the driving chip supplies the driving voltage to the piezoelectric film 214, and the imaging light passes through the adjustable lens Tlens mechanism, the light path is changed, the parallel light becomes converging light, and the converging range of the imaging light is correspondingly increased along with the increase of the driving voltage (that is, the focal length of the adjustable lens Tlens mechanism is gradually decreased from infinity), and the position of the focusing point of the imaging light is changed by controlling the magnitude of the driving voltage, so as to simulate the optical zooming process on the camera module 10.
In particular, for the AF module, in the process of simulating the optical focusing by the optical auxiliary focusing mechanism 20, the voice coil motor of the AF module is not driven, that is, the voice coil motor of the AF module is not powered on, so as to avoid the influence of the auto-focusing function of the AF module on the simulation of the optical focusing process by the optical auxiliary focusing mechanism 20.
Step 2.3: and judging whether the clearest shooting distance of the camera module 10 is the testing distance between the lens 101 in the camera module 10 and the testing calibration table 30 according to the definition change of the testing calibration picture in the simulated optical focusing process, if so, performing the step 3, and otherwise, repeating the step 1 and the step 2.
In step 2.3, in the process that the optical auxiliary focusing mechanism 20 gradually decreases the focal length of the lens from infinity to the minimum (vice versa) or gradually drives the lens position from the closest to the farthest (vice versa), the camera module 10 continuously acquires test calibration pictures with different definitions, and the determining mechanism determines whether the clearest shooting distance of the camera module 10 is the required predetermined optimal shooting distance according to the driving voltage, the focal length of the lens or the lens position corresponding to the clearest test calibration picture.
Specifically, the step 2.3 includes:
step 2.3.1: continuously acquiring the definition change of the test calibration picture in the simulated optical focusing process;
in this step 2.3.1, the judging mechanism is connected to the camera module 10 and reads the test calibration picture from the camera module 10; the determination mechanism may be, but is not limited to, a personal computer.
Step 2.3.2: calculating a definition change curve of the test calibration picture according to the definition change of the test calibration picture;
in this step 2.3.2, the test program in the determination mechanism automatically calculates the sharpness of each frame of the test calibration image, and then outputs the sharpness change curve.
In the definition change curve, if the test calibration pattern is a TVline test pattern, the ordinate of the definition change curve adopts a TVline value, and if the test calibration pattern is an MTF test pattern or an SFR test pattern, the ordinate of the definition change curve adopts an MTF value (the SFR test finally also calculates the MTF value of the image); the abscissa of the sharpness variation curve may be the driving voltage or the lens focal length if the optical auxiliary focusing mechanism 20 simulates the optical focusing process by adjusting the lens focal length thereof, and the abscissa of the sharpness variation curve may be the driving voltage or the lens position if the optical auxiliary focusing mechanism 20 simulates the optical focusing process by adjusting the lens position thereof.
Step 2.3.3: and judging whether the clearest shooting distance of the camera module 10 is the testing distance between the lens 101 in the camera module 10 and the testing calibration table 30 or not according to the definition change curve, if so, performing the step 3, and otherwise, repeating the step 1 and the step 2.
In step 2.3.3, it is determined whether the clearest shooting distance of the camera module 10 is the required predetermined optimal shooting distance according to the point corresponding to the TVline maximum value or the MTF maximum value in the definition change curve.
In this embodiment, a sharpness variation curve shown in fig. 7 is obtained by performing a sharpness test on the camera module 10 by using a TVline test pattern as the test calibration pattern and using an adjustable lens Tlens mechanism as the optical auxiliary focusing mechanism 20, where point a is a point corresponding to a first test calibration picture obtained by the camera module 10 (driving voltage is 0V or a lens focal length is infinite), point B is a point corresponding to a clearest test calibration picture obtained by the camera module 10, if the point a and the point B coincide with each other, it indicates that the clearest shooting distance of the camera module 10 is the required predetermined optimal shooting distance, and if the point a and the point B do not coincide with each other, it indicates that the clearest shooting distance of the camera module 10 deviates from the required predetermined optimal shooting distance.
If the clearest shooting distance of the camera module 10 deviates from the required preset optimal shooting distance, the clearest shooting distance of the camera module 10 and a deviation value between the clearest shooting distance and the required preset optimal shooting distance can be calculated according to the driving voltage, the lens focal length or the lens position corresponding to the TVline maximum value or the MTF maximum value on the definition change curve and the test distance between the lens 101 in the camera module 10 and the test calibration table 30.
And step 3: the relative position between the lens 101 and the sensor 102 in the camera module 10 is fixed.
In the step 3, a position fixing module is used to fix the relative position between the lens 101 and the sensor 102, and generally, a dispensing fixing process is performed between the lens 101 and a lens carrier, and the dispensing fixing process is a conventional process in a process of focusing an AA by a camera, and therefore, will not be described in detail herein; the position fixing module can be but is not limited to a camera AA dispenser.
The AA focusing method can test and verify the clearest shooting distance of the camera module 10 subjected to AA focusing, and if the clearest shooting distance is not the preset optimal shooting distance required by a client, the AA focusing is carried out on the camera module 10 again so as to ensure the product quality.
Example two
A focusing AA equipment of camera module, includes:
the focusing AA module is used for focusing AA on the camera module 10 so as to adjust the relative position between a lens 101 and a sensor 102 in the camera module 10;
the test and verification module is used for testing the camera module 10 subjected to the AA focusing so as to verify whether the clearest shooting distance of the camera module 10 is the required preset optimal shooting distance;
and the position fixing module is used for fixing the camera module 10 which is tested and verified so as to fix the relative position between the lens 101 and the sensor 102 in the camera module 10.
The focusing AA module can be but is not limited to a camera AA testing machine; the position fixing module may be, but is not limited to, a camera AA dispenser, and performs dispensing and fixing between the lens 101 and the lens carrier.
As shown in fig. 3, the test verification module includes:
the test calibration table 30 is used for previewing the camera module 10 to obtain a test calibration picture, and a test distance between the test calibration picture and the lens 101 in the camera module 10 is a preset optimal shooting distance required by the camera module 10;
the optical auxiliary focusing mechanism 20 is configured to be driven to continuously change a focusing point position of an imaging light when the camera module 10 previews the test calibration table 30 through the optical auxiliary focusing mechanism, so as to simulate an optical focusing process on the camera module 10;
and the judging mechanism is used for judging whether the clearest shooting distance of the camera module 10 is the testing distance between the lens 101 in the camera module 10 and the testing calibration table 30 according to the definition change of the testing calibration picture in the simulated optical focusing process.
The optical auxiliary focusing mechanism 20 is located between the camera module 10 and the test calibration table 30, and an optical input end of the optical auxiliary focusing mechanism faces the test calibration pattern on the test calibration table 30, and an optical output end of the optical auxiliary focusing mechanism faces a view port on the camera module 10; the imaging light reflected by the test calibration table 30 enters the camera module 10 to form an image after passing through the optical auxiliary focusing mechanism 20, so as to form the test calibration picture.
The test calibration pattern on the test calibration table 30 for the camera module 10 to preview to obtain the test calibration picture may be a TVline test pattern, an MTF test pattern, or an SFR test pattern.
The required preset optimal shooting distance is determined by the customer according to the product requirement.
The optical auxiliary focusing mechanism 20 has an adjustable lens focal length or an adjustable lens position, that is, the optical auxiliary focusing mechanism 20 includes a zoom lens mechanism with an adjustable lens focal length, such as an adjustable lens Tlens mechanism or a stretchable polymer lens mechanism, or includes a lens driving mechanism with an adjustable lens position, such as a motor mechanism with an optical lens.
Preferably, the optical auxiliary focusing mechanism 20 includes an adjustable lens Tlens mechanism.
As shown in fig. 4, the adjustable lens Tlens mechanism includes a peripheral packaging circuit 22 and a central Tlens component 21, where the peripheral packaging circuit 22 has two pins 23 (one positive electrode and one negative electrode) for connecting to an external power supply to drive, so as to implement drive control on the central Tlens component 21; center Tlens part 21 includes glass substrate 211, high polymer 212, glass film 213 and piezoelectric film 214, set up relatively between glass substrate 211 and the glass film 213 just high polymer 212 encapsulates between the two, piezoelectric film 214 laminating is fixed in on the another side of glass film 213 and with peripheral packaging circuit 22's drive output end is connected electrically.
The working principle of the adjustable lens Tlens mechanism is as follows: when a driving voltage is supplied to the piezoelectric film 214 by using a driving chip in the peripheral packaging circuit 22, the piezoelectric film 214 vibrates to drive the glass film 213 to deform, so that the high molecular polymer 212 packaged between the glass substrate 211 and the glass film 213 is gathered, thereby generating different refractive indexes to change the position of a focusing point of imaging light, and different driving voltages can cause the high molecular polymer 212 to gather in different degrees to form different positions of the focusing point. As shown in fig. 5, when the driving chip does not supply the driving voltage to the piezoelectric film 214, the optical path is not changed when the imaging light passes through the tunable lens Tlens mechanism; as shown in fig. 6, when the driving chip supplies the driving voltage to the piezoelectric film 214, and the imaging light passes through the adjustable lens Tlens mechanism, the light path is changed, the parallel light becomes converging light, and the converging range of the imaging light is correspondingly increased along with the increase of the driving voltage (that is, the focal length of the adjustable lens Tlens mechanism is gradually decreased from infinity), and the position of the focusing point of the imaging light is changed by controlling the magnitude of the driving voltage, so as to simulate the optical zooming process on the camera module 10.
In the definition detection process, the optical auxiliary focusing mechanism 20 gradually reduces the focal length of the lens from infinity to minimum (vice versa) or gradually drives the lens position from closest to farthest (vice versa), the camera module 10 continuously acquires test calibration pictures with different definitions, and determines whether the clearest shooting distance of the camera module 10 is the required predetermined optimal shooting distance according to the driving voltage, the focal length of the lens or the lens position corresponding to the clearest test calibration picture.
The determination mechanism may be, but is not limited to, a personal computer, and is preferably further configured to drive the optical auxiliary focusing mechanism 20 to continuously change the focus position of the imaging light.
The judging mechanism comprises a processor, a memory and a connector, wherein the memory and the connector are respectively electrically connected with the processor, and the connector is used for being connected with the camera module 10 to perform data interaction; the memory is stored with a test program for the processor to execute, and when the processor executes the test program, the following steps are carried out:
continuously acquiring the test calibration picture from the camera module 10 through the connector;
the judging mechanism further comprises a driver for connecting and driving the optical auxiliary focusing mechanism 20. When reading the test calibration picture, the processor also drives the optical auxiliary focusing mechanism 20 through the driver to continuously change the focus position of the imaging light.
Calculating a definition change curve of the test calibration picture according to the definition change of the test calibration picture;
when the definition change curve is calculated, the test program in the judging mechanism automatically calculates the definition of each frame of test calibration picture and then outputs and forms the definition change curve.
In the definition change curve, if the test calibration pattern is a TVline test pattern, the ordinate of the definition change curve adopts a TVline value, and if the test calibration pattern is an MTF test pattern or an SFR test pattern, the ordinate of the definition change curve adopts an MTF value (the SFR test finally also calculates the MTF value of the image); the abscissa of the sharpness variation curve may be the driving voltage or the lens focal length if the optical auxiliary focusing mechanism 20 simulates the optical focusing process by adjusting the lens focal length thereof, and the abscissa of the sharpness variation curve may be the driving voltage or the lens position if the optical auxiliary focusing mechanism 20 simulates the optical focusing process by adjusting the lens position thereof.
And judging whether the clearest shooting distance of the camera module 10 is the required preset optimal shooting distance or not according to the definition change curve.
During the determination, whether the clearest shooting distance of the camera module 10 is the required predetermined optimal shooting distance is determined according to a point corresponding to the maximum TVline value or the maximum MTF value in the definition change curve.
In this embodiment, a sharpness variation curve shown in fig. 7 is obtained by performing a sharpness test on the camera module 10 by using a TVline test pattern as the test calibration pattern and using an adjustable lens Tlens mechanism as the optical auxiliary focusing mechanism 20, where point a is a point corresponding to a first test calibration picture obtained by the camera module 10 (driving voltage is 0V or a lens focal length is infinite), point B is a point corresponding to a clearest test calibration picture obtained by the camera module 10, if the point a and the point B coincide with each other, it indicates that the clearest shooting distance of the camera module 10 is the required predetermined optimal shooting distance, and if the point a and the point B do not coincide with each other, it indicates that the clearest shooting distance of the camera module 10 deviates from the required predetermined optimal shooting distance.
If the clearest shooting distance of the camera module 10 deviates from the required preset optimal shooting distance, the clearest shooting distance of the camera module 10 and a deviation value between the clearest shooting distance and the required preset optimal shooting distance can be calculated according to the driving voltage, the lens focal length or the lens position corresponding to the TVline maximum value or the MTF maximum value on the definition change curve and the test distance between the lens 101 in the camera module 10 and the test calibration table 30.
The above-mentioned embodiments only express the embodiments of the present invention, and the description is more specific and detailed, but not understood as the limitation of the patent scope of the present invention, but all the technical solutions obtained by using the equivalent substitution or the equivalent transformation should fall within the protection scope of the present invention.
Claims (8)
1. A focusing AA method of a camera module is characterized by comprising the following steps:
step 1: focusing AA is carried out on the camera module, and the relative position between a lens and a sensor in the camera module is adjusted;
step 2: testing and verifying whether the clearest shooting distance of the camera module is the required preset optimal shooting distance or not, if so, performing the step 3, and otherwise, repeating the steps 1 and 2;
and step 3: fixing the relative position between a lens and a sensor in the camera module;
wherein, step 2 includes:
step 2.1: previewing the camera module to a test calibration table through an optical auxiliary focusing mechanism to obtain a test calibration picture, wherein the test distance between a lens in the camera module and the test calibration table is a preset optimal shooting distance required by the camera module;
step 2.2: driving the optical auxiliary focusing mechanism to continuously change the focusing point position of the imaging light so as to simulate an optical focusing process on the camera module;
step 2.3: and judging whether the clearest shooting distance of the camera module is the testing distance between a lens in the camera module and the testing calibration table or not according to the definition change of the testing calibration picture in the simulated optical focusing process, if so, carrying out the step 3, and otherwise, repeating the step 1 and the step 2.
2. The camera module focusing AA method according to claim 1, wherein step 2.3 comprises:
step 2.3.1: continuously acquiring the definition change of the test calibration picture in the simulated optical focusing process;
step 2.3.2: calculating a definition change curve of the test calibration picture according to the definition change of the test calibration picture;
step 2.3.3: and judging whether the clearest shooting distance of the camera module is the testing distance between a lens in the camera module and the testing calibration table or not according to the definition change curve, if so, carrying out the step 3, and otherwise, repeating the step 1 and the step 2.
3. The camera module focusing AA method according to claim 1 or 2, wherein the optical auxiliary focusing mechanism continuously changes a focus position of the imaging light by adjusting a lens focal length or a lens position thereof.
4. The method for focusing an AA of a camera module according to claim 1 or 2, wherein the optical auxiliary focusing mechanism comprises an adjustable lens Tlens mechanism.
5. The utility model provides a focusing AA equipment of camera module which characterized in that includes:
the focusing AA module is used for focusing AA on the camera module so as to adjust the relative position between a lens and a sensor in the camera module;
the test verification module is used for testing the camera module subjected to the AA focusing so as to verify whether the clearest shooting distance of the camera module is the required preset optimal shooting distance;
the position fixing module is used for fixing the camera module which is tested and verified so as to fix the relative position between a lens and a sensor in the camera module;
wherein the test validation module comprises:
the test calibration table is used for previewing the camera module to obtain a test calibration picture, and the test distance between the test calibration picture and a lens in the camera module is a preset optimal shooting distance required by the camera module;
the optical auxiliary focusing mechanism is used for being driven to continuously change the focusing point position of imaging light when the camera module previews the test calibration table through the optical auxiliary focusing mechanism so as to simulate an optical focusing process on the camera module;
and the judging mechanism is used for judging whether the clearest shooting distance of the camera module is the testing distance between a lens in the camera module and the testing calibration table or not according to the definition change of the testing calibration picture in the simulated optical focusing process.
6. The focusing AA device of the camera module according to claim 5, wherein the judging mechanism comprises a processor, a memory and a connector, wherein the memory and the connector are respectively electrically connected with the processor, and the connector is used for being connected with the camera module for data interaction; the memory is stored with a test program for the processor to execute, and when the processor executes the test program, the following steps are carried out:
continuously acquiring the test calibration picture from the camera module through the connector;
calculating a definition change curve of the test calibration picture according to the definition change of the test calibration picture;
and judging whether the clearest shooting distance of the camera module is the required preset optimal shooting distance or not according to the definition change curve.
7. The focusing AA device of the camera module according to claim 5 or 6, wherein a lens focal length or a lens position of the optical auxiliary focusing mechanism is adjustable.
8. A focusing AA device for camera module according to claim 5 or 6, characterized in that the optical auxiliary focusing mechanism comprises an adjustable lens Tlens mechanism.
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| CN111263034B (en) * | 2019-05-27 | 2021-06-15 | 苏州松健光学科技有限公司 | Focusing method for vehicle-mounted camera module |
| CN110708447A (en) * | 2019-10-14 | 2020-01-17 | Oppo广东移动通信有限公司 | Camera module and terminal equipment |
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