CN110602382A - Focusing detection method of camera module - Google Patents
Focusing detection method of camera module Download PDFInfo
- Publication number
- CN110602382A CN110602382A CN201910794086.2A CN201910794086A CN110602382A CN 110602382 A CN110602382 A CN 110602382A CN 201910794086 A CN201910794086 A CN 201910794086A CN 110602382 A CN110602382 A CN 110602382A
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- China
- Prior art keywords
- camera
- camera module
- focusing
- otp
- lens
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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
-
- 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
Abstract
The invention relates to the technical field of camera modules, in particular to a focusing detection method of a camera module, which identifies and measures height on a primary image before focusing to determine the position and distance of a camera, facilitates accurate insertion of a focusing claw piece into a gap between the camera and a sound vibration motor, ensures the insertion depth of the focusing claw piece relative to the camera, and avoids the phenomenon that the focusing claw piece cannot grasp the camera or interfere with the camera due to too-deep or too-shallow insertion; the camera is convenient to insert into a gap between the camera and the sound vibration motor accurately, the insertion depth of the dispensing head relative to the camera is guaranteed, and the phenomenon that the dispensing position is inaccurate due to the fact that the dispensing head is inserted too deeply or too shallowly is avoided, so that the camera and the sound vibration motor are unstable.
Description
Technical Field
The invention relates to the technical field of camera modules, in particular to a focusing detection method of a camera module.
Background
With the continuous upgrade of hardware for mobile phone photographing, from single-shot period pixel-splicing image quality to double-shot period large aperture blurring effect, portrait mode, lossless zooming, and to the current triple-shot mobile phone with a large wide-angle lens, no matter whether mobile phone manufacturers or mass consumers pursue the mobile phone for photographing, the mobile phone photographing function has become one of the important factors considered when consumers purchase the mobile phone. The camera module generally comprises a sound vibration motor and a camera screwed in the sound vibration motor in a threaded manner, and the sound vibration motor can drive a lens in the camera to be finely adjusted back and forth so as to realize photographing focusing; most of the existing camera module focusing methods have the problems of low efficiency, low focusing precision and unreasonable dispensing depth.
Disclosure of Invention
The invention aims to at least solve one technical problem in the prior art, and provides a focusing detection method of a camera module, which comprises the following steps:
opening a short circuit and testing electrical property, and detecting the electrical conductivity of the camera module;
black field testing, namely covering the downward movement of the light shield on the camera module to form a black field environment;
identifying the position of a camera by primary image identification and height measurement, and measuring the distance between a lens and a detection surface of a laser range finder;
focusing, wherein a focusing claw piece is inserted into the camera and drives the camera to rotate relative to a sound vibration motor so as to adjust the distance between the camera and a chart;
identifying the position of the camera by secondary image identification and height measurement, and measuring the distance between the lens and the detection surface of the laser range finder;
testing a white field, wherein a white field light source horizontally approaches and irradiates the camera module to form a white field environment;
dispensing, wherein the dispensing head can be close to or inserted into a gap between the camera and the sound vibration motor to perform dispensing operation;
curing, namely irradiating the dispensing position on the camera module by a curing light source to perform curing operation;
and activating, namely controlling the camera module to be opened and closed by an activating assembly, and carrying out at least one photographing operation on the camera module to obtain the photo information.
Has the advantages that: the focusing detection method disclosed by the invention identifies and measures the height of an image once before focusing to determine the position and the distance of the camera, so that the focusing claw piece can be conveniently and accurately inserted into a gap between the camera and a sound vibration motor, the insertion depth of the focusing claw piece relative to the camera is ensured, and the phenomenon that the focusing claw piece cannot grasp the camera or the focusing claw piece interferes with the camera due to too-deep or too-shallow insertion is avoided; the camera is convenient to insert into a gap between the camera and the sound vibration motor accurately, the insertion depth of the dispensing head relative to the camera is guaranteed, and the phenomenon that the dispensing position is inaccurate due to the fact that the dispensing head is inserted too deeply or too shallowly is avoided, so that the camera and the sound vibration motor are unstable.
As a further improvement of the above scheme, the activation step is separately set at the short circuit and electrical property testing step, the black field testing step, the focusing step, and the white field testing step, and aims to ensure that the electrical property testing step, the black field testing step, the focusing step, and the white field testing step can accurately detect the camera module.
As a further improvement of the above scheme, in the focusing step, the relay lens and the focusing claw member move synchronously to a position above the camera module, the camera module is communicated with the optical path of the chart, and after the camera module can shoot the chart through the relay lens, the focusing claw member is controlled to quickly focus the camera according to the definition of the chart, so that the focusing efficiency is improved.
As a further improvement of the above solution, in the step of primary image recognition and height measurement, the image capturing assembly captures an image of the camera to determine a position of a gap between the camera and an inner ring of the vibro-acoustic motor, so as to ensure that the focusing claw can be accurately inserted into the gap between the camera and the vibro-acoustic motor, so that the focusing claw can drive the camera to rotate relative to the vibro-acoustic motor to adjust the focal length.
As a further improvement of the above solution, in the primary image recognition and height measurement step and/or the secondary image recognition and height measurement step, the laser range finder measures the height of the lens first, then measures the height of the upper end surface of the vibro-acoustic motor to determine the height difference between the lens and the upper end surface of the vibro-acoustic motor, and uses the upper end surface of the vibro-acoustic motor as a reference surface for the height of the lens, so that the height of the lens can be determined accurately, and the precision of focusing can be improved.
As a further improvement of the above scheme, in the dispensing step, the ion fan is turned on and faces the dispensing head, and static electricity generated when the dispensing head contacts with the camera module is made clear by the ion fan, so that focusing detection quality of the camera module is ensured.
As a further improvement of the scheme, the method further comprises an OTP burning step, wherein the OTP light source is horizontally arranged above the camera module to perform OTP burning operation, and the relay lens and the OTP light source can be switched to be arranged above the camera module in a linkage manner to perform simulation test.
As a further improvement of the above scheme, the OTP burning step is followed by an OTP detection step, and the OTP light source is horizontally moved above the camera module to perform OTP detection, so as to detect the burning quality.
Drawings
The invention is further described below with reference to the accompanying drawings and examples;
FIG. 1 is a schematic flow chart of an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
As shown in fig. 1, a method for detecting focusing of a camera module includes the following steps:
opening a short circuit and testing electrical property, and detecting the electrical conductivity of the camera module; the camera module is placed on the station and rotates to the position below each functional module along with the station, in the step, the open-short circuit testing device can be controlled by the PC to perform open-short circuit testing on the camera module, whether the camera module is connected with the image acquisition equipment or not is checked, the open-short circuit testing device comprises a linear motor and an open-short circuit testing board, the PC controls the linear motor to move up and down through a motor driver, and the linear motor drives the open-short circuit testing board to move up and down;
black field testing, namely covering the downward movement of the light shield on the camera module to form a black field environment; the activation component controls the camera to be started to shoot at least one picture, whether a white point or a gray point exists on the picture can be detected, and whether the camera module has the white point, the dust and the like can be determined;
the method comprises the steps of carrying out image identification and height measurement once, identifying the position of a camera, measuring the distance between a lens and a detection surface of a laser range finder, photographing through an image pickup assembly to collect position information of a camera module, aligning the laser range finder to a lens to detect the distance of the lens, and conveniently and accurately positioning the position of the lens on the camera; preferably, the image capturing assembly captures a picture of the camera to determine a position of a gap between the camera and the inner ring of the vibro-acoustic motor, and the purpose of the image capturing assembly is to ensure that the focusing claw can be accurately inserted into the gap between the camera and the vibro-acoustic motor, so that the focusing claw can drive the camera to rotate relative to the vibro-acoustic motor to adjust the focal length.
Focusing, the focusing claw piece is inserted into the camera and drives the camera to rotate relative to the audio vibration motor so as to adjust the distance of the camera relative to a chart, the position of the camera measured by the focusing claw piece according to the primary image recognition and height measurement step can be accurately inserted into the gap between the camera and the audio vibration motor, the insertion depth of the focusing claw piece is determined according to the height information of the lens, the situation that the camera cannot be driven to rotate relative to the audio vibration motor due to too shallow insertion or the camera impacts the interior of the audio vibration motor due to too deep insertion or generates interference is avoided, in the embodiment, the height distance between the focusing claw piece and the detection surface of the laser range finder is on the same horizontal plane or is known, and then the height of the focusing claw piece relative to the lens of the camera can be determined, in the embodiment, the relay lens and the focusing claw piece can synchronously move to the upper part of the camera module, the focusing claw piece is arranged in a hollow mode, namely, the camera module is communicated with the light path of a chart, light emitted by the chart can sequentially penetrate through the relay lens and the hollow focusing claw piece and is received by the camera module, and the focusing claw piece is used for controlling the focusing claw piece to quickly focus the camera according to the definition of the chart without switching the relay lens and the focusing claw piece back and forth when multiple times of focusing are needed, so that the focusing efficiency is improved;
the method comprises the following steps of identifying and measuring the height of a secondary image, identifying the position of a camera, measuring the distance between a lens and a detection surface of a laser range finder, photographing through an image pickup assembly to collect position information of a camera module, aligning the laser range finder to a lens to detect the distance of the lens, and conveniently and accurately positioning the position of the lens on the camera; in this embodiment, the steps of secondary image recognition and height measurement are the same as the steps of primary image recognition and height measurement, but the difference is that information obtained by the primary image recognition and height measurement is used in the focusing step, and information obtained by the secondary image recognition and height measurement is used in the dispensing step;
the method comprises the following steps of performing white field test, wherein a white field light source horizontally approaches and irradiates a camera module to form a white field environment, the white field light source horizontally approaches the camera module, the distance between the white field light source and the camera module is close enough but not in contact with each other, so that the white field environment is ensured to cover a camera, and the camera shoots a white field picture to detect whether black spots or dust exist on the camera;
dispensing, wherein a dispensing head can be close to or inserted into a gap between a camera and a sound vibration motor for dispensing, the dispensing head can be accurately close to or inserted into the gap between the camera and the sound vibration motor according to information obtained in the secondary image recognition and height measurement steps, and the dispensing position is ensured to be accurate;
curing, namely irradiating the dispensing position on the camera module by a curing light source to perform curing operation, wherein the curing light source can adopt a conventional UV light source, can move downwards to be close to the camera module, and can be close enough to but not contact the camera module, so that the appropriate illuminance and/or temperature of the UV light source relative to the glue is ensured;
the method comprises an activation step, wherein an activation component controls the camera module to be opened and closed, the camera module can carry out at least one photographing operation to obtain photo information, and the activation step is respectively arranged at the short circuit and electrical property test step, the black field test step, the focusing step and the white field test step and aims to ensure that the camera module can be accurately detected in the electrical property test step, the black field test step, the focusing step and the white field test step.
As a further improvement of the above solution, in the primary image recognition and height measurement step and/or the secondary image recognition and height measurement step, the laser range finder measures the height of the lens first, then measures the height of the upper end surface of the vibro-acoustic motor to determine the height difference between the lens and the upper end surface of the vibro-acoustic motor, and uses the upper end surface of the vibro-acoustic motor as a reference surface for the height of the lens, so that the height of the lens can be determined accurately, and the precision of focusing can be improved.
As a further improvement of the above scheme, in the dispensing step, the ion fan is turned on and faces the dispensing head, and static electricity generated when the dispensing head contacts with the camera module is made clear by the ion fan, so that focusing detection quality of the camera module is ensured.
As a further improvement of the scheme, the method further comprises an OTP burning step, wherein the OTP light source is horizontally arranged above the camera module to perform OTP burning operation, and the relay lens and the OTP light source can be switched to be arranged above the camera module in a linkage manner to perform simulation test.
As a further improvement of the above scheme, the OTP burning step is followed by an OTP detection step, and the OTP light source is horizontally moved above the camera module to perform OTP detection, so as to detect the burning quality.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (8)
1. A focusing detection method of a camera module is characterized by comprising the following steps:
opening a short circuit and testing electrical property, and detecting the electrical conductivity of the camera module;
black field testing, namely covering the downward movement of the light shield on the camera module to form a black field environment;
identifying the position of a camera by primary image identification and height measurement, and measuring the distance between a lens and a detection surface of a laser range finder;
focusing, wherein a focusing claw piece is inserted into the camera and drives the camera to rotate relative to a sound vibration motor so as to adjust the distance between the camera and a chart;
identifying the position of the camera by secondary image identification and height measurement, and measuring the distance between the lens and the detection surface of the laser range finder;
testing a white field, wherein a white field light source horizontally approaches and irradiates the camera module to form a white field environment;
dispensing, wherein the dispensing head can be close to or inserted into a gap between the camera and the sound vibration motor to perform dispensing operation;
curing, namely irradiating the dispensing position on the camera module by a curing light source to perform curing operation;
and activating, namely controlling the camera module to be opened and closed by an activating assembly, and carrying out at least one photographing operation on the camera module to obtain the photo information.
2. The method for detecting focusing of a camera module according to claim 1, wherein the activating step is divided into an open short circuit and electrical property testing step, a black field testing step, a focusing step and a white field testing step.
3. The method for detecting focusing of a camera module according to claim 1, wherein in the focusing step, the relay lens and the focusing claw member move synchronously to above the camera module, and the camera module is communicated with an optical path of a chart.
4. The focus detection assembly of claim 1, wherein in the step of image recognition and height measurement, the image capturing assembly captures a picture of the camera to determine the position of the gap between the camera and the inner ring of the vibro-acoustic motor.
5. The method for detecting focusing of a camera module according to claim 1 or 4, wherein in the primary image recognition and height measurement step and/or the secondary image recognition and height measurement step, the laser distance meter measures the height of the lens first, and then measures the height of the upper end surface of the vibro-acoustic motor to determine the height difference between the lens and the upper end surface of the vibro-acoustic motor.
6. The method for detecting focusing of a camera module according to claim 1, wherein in the dispensing step, the ion fan is turned on and faces the dispensing head.
7. The method for detecting focusing of a camera module according to claim 1, further comprising an OTP burning step, wherein the OTP light source is horizontally disposed above the camera module for OTP burning, and the relay lens and the OTP light source can be switched to above the camera module for simulation testing.
8. The method for detecting the tuning of a camera module according to claim 7, wherein the OTP burning step is followed by an OTP detection step, and the OTP light source is moved horizontally above the camera module for OTP detection.
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| CN201910794086.2A CN110602382A (en) | 2019-08-27 | 2019-08-27 | Focusing detection method of camera module |
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| CN201910794086.2A CN110602382A (en) | 2019-08-27 | 2019-08-27 | Focusing detection method of camera module |
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| CN111770278A (en) * | 2020-07-31 | 2020-10-13 | 重庆盛泰光电有限公司 | Camera module automatic focusing system based on turntable |
| CN114157801A (en) * | 2020-09-08 | 2022-03-08 | 北京小米移动软件有限公司 | Switching control method and device of camera module and storage medium |
| CN114660715A (en) * | 2022-03-28 | 2022-06-24 | 宁波舜宇奥来技术有限公司 | Preparation method of waveguide module |
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Address after: 519090 the second floor of the first phase factory building and administrative office building, No.8, Chuangye East Road, Shuanglin, LIANGANG Industrial Zone, Jinwan District, Zhuhai City, Guangdong Province Applicant after: Zhuhai guanghaojie Technology Co.,Ltd. Address before: The 519090 Bay area Guangdong province Zhuhai City Shuanglin area port Industrial Zone No. eight East Road of entrepreneurship Applicant before: ZHUHAI CITY GUANGHAOJIE PRECISION MACHINERY Co.,Ltd. |
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Application publication date: 20191220 |
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