CN103424978A - System and method for testing camera module - Google Patents
System and method for testing camera module Download PDFInfo
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- CN103424978A CN103424978A CN2012101496363A CN201210149636A CN103424978A CN 103424978 A CN103424978 A CN 103424978A CN 2012101496363 A CN2012101496363 A CN 2012101496363A CN 201210149636 A CN201210149636 A CN 201210149636A CN 103424978 A CN103424978 A CN 103424978A
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Abstract
Provided is a system and method for testing a camera module. The camera module comprises at least one focusing lens and a voice coil motor used for driving the at least one focusing lens to move among a plurality of scanning positions to enable the camera module to complete focusing. The at least one focusing lens is used for moving from an initial position to a focusing position in a response time. The method for testing the camera module comprises the following steps of acquiring the focusing position and a control signal controlling the voice coil motor to drive the at least one focusing lens to move from the initial position to the focusing position, resetting the at least one focusing lens to the initial position and driving the at least one focusing lens to the focusing position to carry out secondary focusing according to the control signal at the same time, and recording the response time that the at least one focusing lens moves from the initial position to the focusing position when the secondary focusing is carried out. The system and method for testing the camera module can measure the response time accurately.
Description
Technical field
The present invention relates to a kind of testing camera module group system and method.
Background technology
Volume is little owing to having for voice coil motor, power consumption reaches the advantage such as cheap less thereby be widely used as focusing or the zoom actuator of camera module.Adopt voice coil motor usually need to test and focus lens (group) is moved to whether satisfied regulation of response time of a focusing position from initial position (when focus in infinite distance to the residing position of focus lens (group)).During test, the subject of test use is arranged at the predetermined object distance place of camera module, the camera module is connected to a test circuit, test circuit is according to get it right burnt position control voice coil motor and drive the movement to focus lens (group) to be focused of the focometer of predetermined object distance and camera module, in addition, whether the shift motion that utilizes a laser range finder to measure focus lens (group) arrives focusing position, respectively the feedback sound coil motor is in the moment of initial position and the moment of focusing position for test circuit, and the response time is the moment poor of the moment and the initial position of focusing position.Yet, though laser range finder is exact instrument, but because the voice coil motor volume is very little, the error of the shift motion that laser range finder measures often exceeds just and sound scope, cause the judgement to whether focus lens (group) being moved to focusing position inaccurate, thereby make the accuracy of surveyed response time lower, cause the overall accuracy of test low.
Summary of the invention
In view of this, be necessary to provide a kind of testing camera module group system and method that improves test accuracy.
A kind of testing camera module group system, for testing a camera module; Described camera module comprises that at least one moves between a plurality of scanning positions focus lens so that the voice coil motor of described camera module focusing for driving this to focus lens and one at least one; Described at least one to focus lens within a response time, from an initial position, moving to a focusing position, described initial position be described camera module when focused in infinite distance described at least one to the residing scanning position of focus lens, described focusing position refer to described camera module to a test helpers focused described at least one to the residing scanning position of focus lens; Described testing camera module group system is for testing the response time of described camera model and comprise: focusing unit, secondary focusing unit and a timing unit automatically; Described automatic focusing unit for control described voice coil motor drive described at least one to focus lens from described initial position to described focusing position, and obtain described focusing position and one control described voice coil motor drive described at least one to focus lens the control signal from described initial position to described burnt position; Described secondary focusing unit for will be described at least one to focus lens be reset to described initial position while according to described control signal by described at least one focus lens is urged to described focusing position to carry out the secondary focusing; Described timing unit for record secondary when focusing described at least one to focus lens the described response time from described initial position to described focusing position.
A kind of testing camera module group method, for testing a camera module; Described camera module comprise at least one to focus lens and one for driving this to move between a plurality of scanning positions focus lens so that the voice coil motor of described camera module focusing; Described at least one to focus lens within a response time, from an initial position, moving to a focusing position, described initial position be described camera module when focused in infinite distance described at least one to the residing scanning position of focus lens, described focusing position refer to described camera module to a test helpers focused described at least one to the residing scanning position of focus lens; Described testing camera module group method is for testing the described response time and comprising the following steps:
S1: control described voice coil motor drive described at least one to focus lens from described initial position to described focusing position, and obtain described focusing position and one control described voice coil motor drive described at least one to focus lens the control signal from described initial position to described burnt position;
S2: by described at least one to focus lens be reset to described initial position and simultaneously according to described control signal by described at least one focus lens is urged to described focusing position to carry out the secondary focusing;
S3: record secondary when focusing described at least one to focus lens the described response time from described initial position to described focusing position.
With respect to prior art, testing camera module group system and method provided by the invention, describedly can move to described burnt position when focus lens is focused by secondary more accurately, so, can measure exactly the described response time.
The accompanying drawing explanation
Fig. 1 is the block diagram of testing camera module group system provided by the present invention.
The curve relation figure of scanning step number and focus value when Fig. 2 is the test of the testing camera module group system shown in Fig. 1.
The curve relation figure of drive current and focus value when Fig. 3 is the test of the testing camera module group system shown in Fig. 1.
Fig. 4 is the FB(flow block) of testing camera module group method provided by the present invention.
The main element symbol description
| The testing camera |
100 |
| Automatic focusing |
11 |
| Scanning step |
111 |
| |
112 |
| The focus |
113 |
| The |
114 |
| |
12 |
| |
13 |
| |
14 |
| |
15 |
| The |
200 |
| |
21 |
| To focus |
22 |
| |
23 |
| |
24 |
| The |
300 |
| Step | S1、S2、S3、S31、S4、S5 |
Following embodiment further illustrates the present invention in connection with above-mentioned accompanying drawing.
Embodiment
Refer to Fig. 1, the invention provides a kind of testing camera module group system 100 that preferred embodiment provides, for testing a camera module 200.Described camera module 200 comprise a voice coil motor 21, at least one be contained in described voice coil motor 21 to focus lens 22, circuit board 23 and the image sensor 24 be connected on described circuit board 23.Described voice coil motor 21 for driving this to move between a plurality of scanning positions focus lens 22 so that described camera module 200 focusing, thereby form image clearly in described image sensor 24.Described image sensor 24 can be electric coupling sensor (Charged-coupled Device, CCD), for light signal being converted to electric signal to obtain the image of a subtest object 300.
Described testing camera module group system 100 is electrically connected to the circuit board 23 of described camera module 200.Described testing camera module group system 100 comprises automatically focusing unit 11, storage unit 12, secondary focusing unit 13, a timing unit 14 and a display unit 15.
Described automatic focusing unit 11 for obtain one drive described to focus lens 22 control signal from initial position to a focusing position, described initial position is that 100 pairs of infinite distances of described camera module are described to the residing scanning position of focus lens 22 while being focused.Described storage unit 12 is connected to described automatic focusing unit 11, and described storage unit 12 is for storing described control signal.Described secondary focusing unit 13 is connected to described storage unit 12, and described secondary focusing unit 13 is for being reset to described initial position and by described, focus lens 22 being urged to described focusing position to carry out the secondary focusing according to described control signal focus lens 22 described simultaneously.Described timing unit 14 is connected to described secondary focusing unit 13, and described timing unit 14 is for recording the described difference that focus lens 22 is reset to the moment of moment of initial position and secondary focusing and calculates the described moment to focus lens 22 secondaries focusings and the moment that is reset to initial position to obtain a response time.Described display unit 15 is connected to described timing unit 14, and described display unit 15 is for showing the described response time.
Concrete, described automatic focusing unit 11 comprises a scanning step number control module 111, current control unit 112, a focus value computing unit 113 and an amperometric determination unit 114.
Described voice coil motor 21 has a fixed journey system (stroke), and for example, described fixed journey system can be 20 millimeters (mm).Described fixed journey system can be divided into n scanning step number (step), and described n scans step number and refer to that described voice coil motor 21 once covers the number of times that described fixed journey system need to move, and described n is integer, and for example n can be 1024.
Refer to Fig. 1 and Fig. 2, during test, at first set the object distance of described subtest object 300 to described camera module 200, for example described object distance is 10 centimetres (cm).Described scanning step number control module 111 drives the described scanning step number that focus lens 22 is moved to each scanning position for setting described voice coil motor 21, as shown in Figure 2, when described, to focus lens 22 during in described initial position, the scanning step number of described voice coil motor 21 is 0.Described scanning step number control module 111 increases the scanning step number of described voice coil motor 21 gradually with a step number increment, described step number increment can be for example 10, said voice coil motor 21 drives and described focus lens 22 is moved to each scanning position, and for example each scanning position increases progressively and is respectively according to the scanning step number: 10 scanning step numbers, 20 scanning step numbers, 30 scanning step numbers ... to n scanning step number.
Described current control unit 112 is connected to described scanning step number control module 111 and described focus lens 22 is moved to the required drive current of described each scanning position for providing described voice coil motor 21 to drive, so, under the driving of described current control unit 112, described voice coil motor 21 can drive and described focus lens 22 be moved to described each scanning position.
Described focus value computing unit 113 be connected to described current control unit 112 and for the focus value of calculating the image that each scanning position catches and scanning position when focus value is peak value be defined as focusing position.In present embodiment, described focus value is modulating transfer function value (modulation transfer function, MTF), as shown in Figure 2, the mtf value of the image that described focus value computing unit 113 each scanning positions of calculating catch, the scanning step number is that 380 o'clock mtf values have peak value, therefore determines that the scanning position that the scanning step number is is defined as described focusing position at 380 o'clock.
Described amperometric determination unit 114 is connected to described focus value computing unit 113 and drives the described driving current value that focus lens 22 is moved to described focusing position for measuring described voice coil motor 21, in present embodiment, described control signal is that described voice coil motor 21 drives the described driving current value that focus lens 22 is moved to described focusing position.Described amperometric determination unit 114 drives the described current value that focus lens 22 is moved to described focusing position for measuring voice coil motor 21, for example, as shown in Figure 3, described amperometric determination unit 114 records described voice coil motor 21 to drive the described driving current value that focus lens 22 is moved to the focusing position that described scanning step number is at 380 o'clock is 38.356 milliamperes (mA).
Described storage unit 12 connects described amperometric determination unit 114 and for storing described control signal (being that described voice coil motor 21 drives the described driving current value that focus lens 22 is moved to described focusing position).
Described secondary focusing unit 13 is connected to described storing storage units 12 and described initial position is simultaneously described to be driven the described driving current value that focus lens 22 is moved to described focusing position to described voice coil motor 21 according to described voice coil motor 21 and provide described voice coil motor 21 drive the described drive current that focus lens 22 is moved to described focusing position to described voice coil motor 21 for will be described focus lens 22 being reset to, thereby focus lens 22 is urged to described focusing position carries out the secondary focusing described.The focusing of described secondary refers to and described focus lens 22 is reset to after described initial position under described voice coil motor 21 drives the driving of the described drive current that focus lens 22 is moved to described focusing position and moves to for the second time described focusing position, and it is described focusing position that example scans the scanning position that step number is as shown in Figure 2 at 380 o'clock.
Thereby described timing unit 14 be connected to described secondary focusing unit 13 and for record respectively described focus lens 22 is reset to the moment of moment of initial position and secondary focusing and calculates the described moment to focus lens 22 secondaries focusings obtain a response time with the moment that is reset to initial position.For example, it is 21331734 milliseconds (ms) that described timing unit 14 records respectively the described moment that focus lens 22 is reset to initial position, the described moment to focus lens 22 secondary focusings is 21332234ms, and described timing unit 14 is calculated to such an extent that the described response time that focus lens 22 is moved to focusing position from described initial position is: 21332234-21331734=500 (ms).
Described display unit 15 is connected to described timing unit 14 and for the aobvious described response time.In other embodiments, described display unit 15 also for show described voice coil motor 21 drive described to focus lens 22 move to described focusing position driving current value, described focus lens 22 is reset to the moment of initial position and the moment of secondary focusing.
Referring to Fig. 4, is a kind of testing camera module group method provided by the invention, for testing described camera module 200.Described testing camera module group method comprises the following steps:
S1: obtain described focusing position and one control described voice coil motor 21 drive described at least one to focus lens the control signal from described initial position to described burnt position.In this step, by described automatic focusing unit 11 obtain one drive described to focus lens 22 control signal from initial position to described focusing position.Described control signal is that voice coil motor 21 drives the described driving current value that focus lens 22 is moved to described focusing position.
S2: focus lens is reset to described initial position and simultaneously according to described control signal, by described, focus lens is urged to described focusing position carries out the secondary focusing by described.In this step, described secondary focusing unit 13 will be described be reset to described initial position to focus lens 22 and drives the described driving current value that focus lens 22 is moved to described focusing position according to described voice coil motor 21 simultaneously and provide described voice coil motor 21 drive the described drive current that focus lens 22 is moved to described focusing position to described voice coil motor 21, thereby focus lens 22 is urged to described focusing position carries out the secondary focusing described.
S3: record the moment that described camera lens is reset to moment of initial position and secondary focusing, calculate the described moment to the focusing of focus lens secondary be reset to initial position difference to obtain the described response time.In this step, described timing unit 14 records respectively and described focus lens 22 is reset to the moment of moment of initial position and secondary focusing and calculates the described moment to focus lens 22 secondaries focusings and the difference in the moment that is reset to initial position, thereby obtains the described response time.
Further comprising the steps between above-mentioned steps S1 and step S2: by the described control signal of described storage unit 12 storage (being that described voice coil motor 21 drives the described driving current value that focus lens 22 is moved to described focusing position).
Further comprising the steps after above-mentioned steps S3: as by described display unit 15, to show the described response time.
Testing camera module group system and method provided by the invention, scanning position when focus value is peak value is defined as described focusing position and measures the driving current value of focusing position, when described secondary focusing unit provides the driving current value of described focusing position to described voice coil motor, describedly to focus lens, can move to exactly described focusing position, so, can standard measure definitely the described response time.
In present embodiment, described automatic focusing unit 11 is by calculating mtf value and determining that the scanning position that mtf value is peak value is defined as described focusing position, in other embodiments, described automatic focusing unit 11 can adopt any-mode of the prior art to determine described focusing position.
In addition, those skilled in the art can also do other variation in spirit of the present invention.Certainly, the variation that these are done according to spirit of the present invention, within all should being included in the present invention's scope required for protection.
Claims (10)
1. a testing camera module group system, for testing a camera module; Described camera module comprises that at least one moves between a plurality of scanning positions focus lens so that the voice coil motor of described camera module focusing for driving this to focus lens and one at least one; Described at least one to focus lens within a response time, from an initial position, moving to a focusing position, described initial position be described camera module when focused in infinite distance described at least one to the residing scanning position of focus lens, described focusing position refer to described camera module to a test helpers focused described at least one to the residing scanning position of focus lens; Described testing camera module group system is for testing the response time of described camera model and comprise: focusing unit, secondary focusing unit and a timing unit automatically; Described automatic focusing unit for control described voice coil motor drive described at least one to focus lens from described initial position to described focusing position, and obtain described focusing position and one control described voice coil motor drive described at least one to focus lens the control signal from described initial position to described burnt position; Described secondary focusing unit for will be described at least one to focus lens be reset to described initial position while according to described control signal by described at least one focus lens is urged to described focusing position to carry out the secondary focusing; Described timing unit for record secondary when focusing described at least one to focus lens the described response time from described initial position to described focusing position.
2. testing camera module group system as claimed in claim 1, it is characterized in that: described automatic focusing unit comprises one scan step number control module, a current control unit, a focus value computing unit and an amperometric determination unit; Described step number control module for set described voice coil motor drive described at least one focus lens is moved to the scanning step number of each scanning position; Described current control unit for provide described voice coil motor drive described at least one focus lens is moved to the required drive current of described each scanning position; The scanning position of described focus value computing unit for the focus value of calculating the image that each scanning position catches and when focus value is peak value is defined as described focusing position; Described amperometric determination unit for measure described sound drive motor driving described at least one focus lens is moved to the driving current value of described focusing position, described control signal be described sound drive motor driving described at least one focus lens is moved to the driving current value of described focusing position; Described secondary focusing unit according to described control signal to described voice coil motor provide drive described at least one to focus lens move to described focusing position drive current so that described at least one focus lens is carried out to the secondary focusing.
3. testing camera module group system as claimed in claim 2, it is characterized in that: described focus value is modulating transfer function value.
4. testing camera module group system as claimed in claim 2, it is characterized in that: described step number control module increases the scanning step number of described voice coil motor gradually with a step number increment.
5. testing camera module group system as claimed in claim 1, it is characterized in that: described testing camera module group system also comprises that one for storing the storage unit of described control signal.
6. testing camera module group system as claimed in claim 1, it is characterized in that: described testing camera module group system also comprises that one for showing the display unit of described response time.
7. testing camera module group system as claimed in claim 1 is characterized in that: described subtest object to the object distance of described camera module is 10 centimetres.
8. a testing camera module group method, for testing a camera module; Described camera module comprise at least one to focus lens and one for driving this to move between a plurality of scanning positions focus lens so that the voice coil motor of described camera module focusing; Described at least one to focus lens within a response time, from an initial position, moving to a focusing position, described initial position be described camera module when focused in infinite distance described at least one to the residing scanning position of focus lens, described focusing position refer to described camera module to a test helpers focused described at least one to the residing scanning position of focus lens; Described testing camera module group method is for testing the described response time and comprising the following steps:
S1: control described voice coil motor drive described at least one to focus lens from described initial position to described focusing position, and obtain described focusing position and one control described voice coil motor drive described at least one to focus lens the control signal from described initial position to described burnt position;
S2: by described at least one to focus lens be reset to described initial position and simultaneously according to described control signal by described at least one focus lens is urged to described focusing position to carry out the secondary focusing;
S3: record secondary when focusing described at least one to focus lens the described response time from described initial position to described focusing position.
9. the testing camera module group method of stating as claim 8 is characterized in that: between described step S1 and step S2, further suddenly comprise the following steps: store described control signal.
10. testing camera module group method as claimed in claim 8, is characterized in that: after described step S3, further suddenly comprise the following steps: show the described response time.
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| CN103837828A (en) * | 2014-03-27 | 2014-06-04 | 广东欧珀移动通信有限公司 | Travel curve test method and system of camera-shooting mode motor and mobile terminal |
| CN104506854A (en) * | 2014-12-31 | 2015-04-08 | 中科创达软件股份有限公司 | Test system and test method of electronic equipment |
| CN105446055A (en) * | 2014-06-16 | 2016-03-30 | 南昌欧菲光电技术有限公司 | Camera module group and focusing method therefor |
| CN105652561A (en) * | 2016-03-18 | 2016-06-08 | 联想(北京)有限公司 | Focusing method and device |
| CN110246188A (en) * | 2019-05-20 | 2019-09-17 | 歌尔股份有限公司 | Internal reference scaling method, device and camera for TOF camera |
| CN114666485A (en) * | 2022-04-25 | 2022-06-24 | 茂莱（南京）仪器有限公司 | Lens module automatic focusing control system and control method based on MTF |
| CN114915719A (en) * | 2021-02-09 | 2022-08-16 | 浙江宇视科技有限公司 | Self-checking method and device for holder camera shooting equipment, holder camera shooting equipment and medium |
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| CN103837828A (en) * | 2014-03-27 | 2014-06-04 | 广东欧珀移动通信有限公司 | Travel curve test method and system of camera-shooting mode motor and mobile terminal |
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| CN105446055B (en) * | 2014-06-16 | 2019-04-16 | 南昌欧菲光电技术有限公司 | Camera mould group and its focusing method |
| CN104506854A (en) * | 2014-12-31 | 2015-04-08 | 中科创达软件股份有限公司 | Test system and test method of electronic equipment |
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| CN105652561A (en) * | 2016-03-18 | 2016-06-08 | 联想(北京)有限公司 | Focusing method and device |
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| CN110246188A (en) * | 2019-05-20 | 2019-09-17 | 歌尔股份有限公司 | Internal reference scaling method, device and camera for TOF camera |
| CN114915719A (en) * | 2021-02-09 | 2022-08-16 | 浙江宇视科技有限公司 | Self-checking method and device for holder camera shooting equipment, holder camera shooting equipment and medium |
| CN114915719B (en) * | 2021-02-09 | 2024-04-05 | 浙江宇视科技有限公司 | Self-checking method and device of cradle head camera equipment, cradle head camera equipment and medium |
| CN114666485A (en) * | 2022-04-25 | 2022-06-24 | 茂莱（南京）仪器有限公司 | Lens module automatic focusing control system and control method based on MTF |
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