CN1661469A - Method of tuning focus of digital camera lens module - Google Patents
Method of tuning focus of digital camera lens module Download PDFInfo
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- CN1661469A CN1661469A CN 200410015596 CN200410015596A CN1661469A CN 1661469 A CN1661469 A CN 1661469A CN 200410015596 CN200410015596 CN 200410015596 CN 200410015596 A CN200410015596 A CN 200410015596A CN 1661469 A CN1661469 A CN 1661469A
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- lens module
- camera lens
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- sensor
- focal point
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Abstract
The present invention provides a focus point regulation method of digital camera lens module. It utilizes the principle of that the image formation of specific test pattern passed through lens module can be superimposed with sensor to produce overlapped grain phenomenon, said overlapped grain pattern is more complex, and is easy to judge the sharpness of image formation so as to define focus position of said lens module.
Description
[technical field]
The invention relates to a kind of spacing that is used to adjust sensor and lens combination, thereby make the focal point adjusting method of the digital camera lens module of this camera lens module imaging effect the best.
[background technology]
Owing to comprehensive reasons such as the constituent part scale error of digital camera lens module and rigging error, lens thickness, index of refraction in lens error, airspace cause the focal position to change, therefore, in digital camera lens module assembly maintenance process, one focusing operation is arranged, promptly adjust the spacing of lens combination and sensor, thereby the light signal that incident light scioptics group is incident on the sensor reaches best, thereby makes imaging the most clear.
China Intellectual Property Office is the focal point adjusting method that 02107028.8 patented claim discloses a kind of phtographic lens in the patent No. of Granted publication on the 16th October in 2002, the invention provides a kind of focal point adjusting method of phtographic lens, this method is in the position of leaving phtographic lens with the slit-shaped graphical layout, utilize this to establish the above-mentioned figure of shadow lens shooting, calculate the MFT value according to above-mentioned image pickup result, decide the focus adjusted value of above-mentioned phtographic lens according to above-mentioned MFT value, make the image space of phtographic lens become optimal focus position.Though this method focusing degree of accuracy height, equipment is very complicated, cost is very high.And be not suitable for simple in structure, digital camera that volume is less with mobile phone and PDA portable electronic equipments such as (personal digital assistants).
Traditional optical table that utilizes carries out the method that focus is adjusted to the camera lens module, be that a kind of sensation detects, testing staff's fatiguability and cause the testing result instability, and use photoelectric collimator that the camera lens module is carried out the method that focus is adjusted, only can identify the focusing situation that can not demonstrate fully the camera lens module, cause focus effect not good from the light quantity aspect.
In view of this, provide the digital camera lens module focal point adjusting method that a kind of equipment is simple and the adjustment precision is preferable real for necessary, this method is used to adjust the distance of sensor and lens combination, make the light signal that incident light scioptics group incides on the sensor reach best, thereby make imaging the most clear.
[summary of the invention]
The object of the present invention is to provide a digital camera lens module focal point adjusting method, the simple and adjustment precision height of this method equipment.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: it may further comprise the steps the focal point adjusting method of digital camera lens module of the present invention: a kind of digital camera lens module is provided, this camera lens module comprises: a plurality of lens, lens barrel and sensor, and the spacing of these lens and sensor is adjustable; One test macro is provided, this test macro comprises: a test pattern, a test board and a supervising device, this test pattern can produce folded line phenomenon with the sensor stack through the imaging of above-mentioned camera lens module, and this test board and supervising device can be electrically connected by signal connecting line; Electrically be assemblied in the camera lens module on the test board; Utilize signal connecting line that test board is connected with supervising device, import camera lens module shot image signals into supervising device; Adjust the relative position of test pattern and test board, be incident upon lens with best angle to guarantee incident light; Observe this image and adjust the spacing of the lens and the sensor of camera lens module, produce folded clearly line phenomenon, the spacing of tube lens and sensor is fixed until the image of observing on the supervising device.
The invention has the beneficial effects as follows: the folded line phenomenon that this method utilizes test pattern to produce through the imaging of camera lens module and sensor stack is judged the sharpness of imaging, thereby decision focal position, make focal point adjusting method equipment simple, and more traditional optical table method of adjustment degree of accuracy height.
[description of drawings]
Fig. 1 is the test macro synoptic diagram of the focal point adjusting method of digital camera lens module of the present invention.
Fig. 2 is a Fresnel annular plate synoptic diagram.
Fig. 3 is the figure of the folded line phenomenon that produces of the pixel stack of the image that is taken of Fresnel annular plate and sensor.
[embodiment]
The applied principle of the present invention is that suitable transparent grating (grating) of two groups of spatial frequencys or grid (grid) a certain angle that tilts can form a kind of pattern after overlapping, is called folded line (moire).
Digital camera lens module focal point adjusting method of the present invention may further comprise the steps:
Please refer to shown in Figure 1ly, a digital camera lens module 20 to be focused is provided, this camera lens module 20 comprises a plurality of lens, lens barrel and sensor.These lens are placed in the lens barrel and form lens combination, and the spacing of this lens combination and sensor is adjustable, and incident ray can focus on after lens converge on the sensor, and this sensor is converted to electric signal with light signal, thereby finishes capturing images.This sensor is periodic arrangement by a plurality of light-sensitive image vegetarian refreshments, thereby forms photosensitive array (array).This sensor can be CCD (Charge Coupled Device, charge coupled device) or CMOS (Complementary Metal-Oxide Semiconductor, complementary metal oxide semiconductor (CMOS)).
One test macro 10 is provided, and this test macro comprises test Figure 11, a test board 12 and a supervising device 13.This test Figure 11 is a Fresnel annular plate (Fresnel Zoneplate).Figure on this annular plate as shown in Figure 2, this figure has following characteristics: all at interval annulus areas be equal to the center circle area, therefore, the spacing distance of heal outside side ring and interannular is more little.This test board 12 is provided with interlock circuit and signal transmssion line 14, and USB (Universal Serial Bus, USB (universal serial bus)) bus for example can be carried out corresponding conversion with the picture signal of test Figure 11 that sensor captured and is sent in the supervising device 13.This supervising device 13 can be one to have the computer of relative program, and it is converted to VGA (Video Graphics Array, Video Graphics Array) video signal form with the picture signal that receives and is presented on the display screen.Judge by the image definition that the Fresnel annular plate is presented on the supervising device 13 whether the lens combination of camera lens module 20 and the spacing of sensor reach best after 20 imagings of camera lens module.
During focusing, camera lens module 20 electrically is assemblied on the test board 12, usb bus on the test board 12 14 and supervising device 13 are electrically connected, adjust the position of test Figure 11 and test board 12, make the test Figure 11 be positioned at test board 12 dead aheads and the two height and distance suitable, thereby the image size that test Figure 11 is produced behind camera lens module 20 is fit to observe, and camera lens module 20 is over against test Figure 11, so that incident light is incident upon lens with best angle.Because being on sensor through lens combination, the Fresnel annular plate dwindles real image, and the heal spacing of outside side ring and interannular of Fresnel annular plate is more little, principle according to above-mentioned folded line generation, when this ring and the spacing distance of interannular and the pixel sizableness on the sensor, can produce folded line phenomenon shown in Figure 3 with this sensor stack, it is tiny and complicated to fold print image, can observe folded line phenomenon when having only imaging enough clear, thereby be easy to judge the sharpness of imaging by observing this folded print image.In addition, as everyone knows, cause that image planes edge image quality is not as the center image quality owing to can produce phenomenons such as the image planes edge illumination decline (owing to string biquadratic theorem and gradual halation phenomena etc. cause) and the curvature of field in the shooting process, should folded line phenomenon be to be created in around the image, if can clearly observe this folded line phenomenon, then can determine the sufficiently clear of this image, thereby can determine preferable focal position.Therefore, the lens combination of camera lens module and the distance of sensor are adjusted in the image limit through the camera lens module forms that the limit is observed in this supervising device, image on supervising device produces folded clearly line phenomenon, and the spacing of tube lens and sensor is fixed, and promptly finishes the accent operation.
The density situation of the Fresnel annular plate annulus in this method can be changed according to the difference of camera lens module 20, most important condition is to guarantee outer ring and the spacing of interannular and pixel sizableness sensor on of this annular plate in the imaging on the sensor, thereby can produce the folded line phenomenon of just observing.For example: if the resolution of sensor is higher, then the spacing of the outer ring of this annular plate and interannular should be less.
Be appreciated that figure on this test Figure 11 also can be radial grating (radiatinglines), convergence circle grating (converging circles) waits other can produce the figure of complicated folded print image with the sensor stack.
Claims (10)
1. the focal point adjusting method of a digital camera lens module, it is characterized in that: it may further comprise the steps:
A kind of digital camera lens module is provided, and this camera lens module comprises: a plurality of lens, lens barrel and sensor, in these a plurality of lens arrangement lens barrels, form lens combination, and the spacing of this lens combination and sensor is adjustable;
One test macro is provided, and this test macro comprises: a test pattern, a test board and a supervising device;
Electrically be assemblied in the camera lens module on the test board;
Utilize signal connecting line that test board is connected with supervising device, import camera lens module shot image signals into supervising device;
Adjust the position of test pattern and test board, guarantee that incident light is incident upon lens with best angle;
Observe the image that forms by the camera lens module in this supervising device and adjust the lens combination of camera lens module and the distance of sensor, the image on supervising device produces folded clearly line phenomenon, and the spacing of lens combination and sensor is fixed.
2. the focal point adjusting method of digital camera lens module as claimed in claim 1 is characterized in that: described sensor is periodic arrangement by a plurality of light-sensitive image vegetarian refreshments and forms, thereby forms photosensitive array.
3. the focal point adjusting method of digital camera lens module as claimed in claim 1 is characterized in that: described sensor is a charge coupled device.
4. the focal point adjusting method of digital camera lens module as claimed in claim 1 is characterized in that: described sensor is a complementary metal oxide semiconductor (CMOS).
5. the focal point adjusting method of digital camera lens module as claimed in claim 2 is characterized in that: the image that described test pattern forms after by above-mentioned camera lens module can produce folded line phenomenon with the sensor stack.
6. the focal point adjusting method of digital camera lens module as claimed in claim 5 is characterized in that: the edge of image that described test pattern forms after by above-mentioned camera lens module can produce folded line phenomenon with the sensor stack.
7. the focal point adjusting method of digital camera lens module as claimed in claim 1 is characterized in that: described test pattern is the Fresnel annular plate.
8. the focal point adjusting method of digital camera lens module as claimed in claim 1 is characterized in that: described test pattern is a radial grating.
9. the focal point adjusting method of digital camera lens module as claimed in claim 1 is characterized in that: described test pattern is the convergence circle grating.
10. the focal point adjusting method of digital camera lens module as claimed in claim 1 is characterized in that: have the interlock circuit that the picture signal of the test pattern that sensor captured can be carried out corresponding conversion on the described test board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410015596 CN1661469A (en) | 2004-02-28 | 2004-02-28 | Method of tuning focus of digital camera lens module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410015596 CN1661469A (en) | 2004-02-28 | 2004-02-28 | Method of tuning focus of digital camera lens module |
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| CN1661469A true CN1661469A (en) | 2005-08-31 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100541325C (en) * | 2006-05-22 | 2009-09-16 | 比亚迪股份有限公司 | Transmission type film test card and using method thereof that a kind of Camera Test uses |
| CN100562132C (en) * | 2005-12-23 | 2009-11-18 | 鸿富锦精密工业（深圳）有限公司 | The assembling of numerical camera mould and test macro and method |
| CN101685240B (en) * | 2008-09-26 | 2011-07-20 | 致伸科技股份有限公司 | Method for judging focusing quality of image extracting device |
| CN104834177A (en) * | 2015-05-06 | 2015-08-12 | 福建省光学技术研究所 | Lens testing and calibration device |
| CN103702035B (en) * | 2014-01-14 | 2017-01-04 | 昆山丘钛微电子科技有限公司 | Photographic head module quickly regulating method based on FOV |
| CN109254492A (en) * | 2017-07-13 | 2019-01-22 | 宁波舜宇光电信息有限公司 | The transmission system of camera module test |
-
2004
- 2004-02-28 CN CN 200410015596 patent/CN1661469A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100562132C (en) * | 2005-12-23 | 2009-11-18 | 鸿富锦精密工业（深圳）有限公司 | The assembling of numerical camera mould and test macro and method |
| CN100541325C (en) * | 2006-05-22 | 2009-09-16 | 比亚迪股份有限公司 | Transmission type film test card and using method thereof that a kind of Camera Test uses |
| CN101685240B (en) * | 2008-09-26 | 2011-07-20 | 致伸科技股份有限公司 | Method for judging focusing quality of image extracting device |
| CN103702035B (en) * | 2014-01-14 | 2017-01-04 | 昆山丘钛微电子科技有限公司 | Photographic head module quickly regulating method based on FOV |
| CN104834177A (en) * | 2015-05-06 | 2015-08-12 | 福建省光学技术研究所 | Lens testing and calibration device |
| CN104834177B (en) * | 2015-05-06 | 2017-04-26 | 福建省光学技术研究所 | Lens testing and calibration device |
| CN109254492A (en) * | 2017-07-13 | 2019-01-22 | 宁波舜宇光电信息有限公司 | The transmission system of camera module test |
| CN109254492B (en) * | 2017-07-13 | 2021-02-09 | 宁波舜宇光电信息有限公司 | Transmission system for camera module test |
| CN112596335A (en) * | 2017-07-13 | 2021-04-02 | 宁波舜宇光电信息有限公司 | Transmission system for camera module test |
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