CN1912669A - Focusing test device capable of regulating focus of image sensing module and focusing platform - Google Patents
Focusing test device capable of regulating focus of image sensing module and focusing platform Download PDFInfo
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- CN1912669A CN1912669A CN200510089779.XA CN200510089779A CN1912669A CN 1912669 A CN1912669 A CN 1912669A CN 200510089779 A CN200510089779 A CN 200510089779A CN 1912669 A CN1912669 A CN 1912669A
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Abstract
A testing device enabling to adjust focus distance of image sensing module consists of base, positioning unit, gear set, image sensing module and stepping motor. It is featured as using image processing unit to dynamically calculate out and record modulated transmission function value of image sensing module, judging out focal distance of image sensing module when modulated transmission function is at optimum value, sending this position to stepping motor to let stepping motor regulate focus distance of image sensing module to be focus distance with optimum value of modulated transmission function.
Description
Technical field
The invention provides a kind of focusing test device and focusing platform of adjustable image sensing module focal length, especially refer to a kind of by image processor, focus of image sensing module when judging modulation transfer function with optimum value, and adjust the focusing test device and the focusing platform of focus of image sensing module automatically with stepper motor.
Background technology
The kind of camera lens can be divided into two kinds: zoom lens and tight shot.Zoom lens is meant that camera lens can be in the range size of some limit inner conversion shooting picture, common burnt section similarly is 18-55mm or 75-300mm etc., with the situation of the theme invariant position of taking under, can rotate the coverage size that the zoom ring comes scenery in the conversion picture.So-called tight shot refers to the fixing camera lens of burnt section, for example 24mm, 85mm etc.The coverage of this camera lens is fixed, when the distance one of we and photographed subject regularly, the scope of captured scenery is the same.Optical sensor in the tight shot is general adopt charge-coupled assembly (charge-coupled device, CCD) or complementary metal oxide semiconductor (complementary metal-oxide semiconductor, CMOS).The distance of optical sensor and camera lens must just can make this tight shot reach preferably performance through adjusting in the tight shot.
Prior art generally adopts dual mode to adjust the focal length of tight shot: first kind is to adopt manual mode to adjust the distance of optical sensor and camera lens, optical module at the tight shot camera, at first capture the image of optical sensor in the optical module, image is presented on the display device again, utilize the performance of lines contrast in the naked eyes checking image, with the focal length of manual type manual adjustment tight shot, the image that optical module produced is transferred to optimum condition.The method of adjustment end is by individual's judgement of focusing personnel manually for this kind, and the accuracy of focusing can vary with each individual, and influences the consistance of camera lens quality unavoidablely.In addition, cultivating outstanding focusing personnel needs the time, and focusing personnel also can't adjust a plurality of tight shots simultaneously.Therefore, when a large amount of production, often need a large amount of focusing mechanisms and personnel, increase manufacturing cost.
The prior art of the another kind of focal length of adjusting tight shot is then in the distance of manual adjustment optical sensor and camera lens, behind the image of acquisition optical sensor, use a computer and calculate modulation transfer function (the modulation transfer function calculator of tight shot, MTF), again the focal length of tight shot is transferred to position when having best modulation transfer function.
Yet, these the two kinds methods of adjusting by the control of manual and non-integral, be subjected to the influence of extraneous test environment easily, and (the auto exposure of automatic exposure in the test process that is controlled at not yet in effect, AE) or Automatic white balance (auto white balance, AWB) therefore isoparametric variation tends to produce erroneous judgement in the optimum position of judging the best modulation transfer function of tool, makes production line usually need to test again tight shot.Therefore, use the focal length value that this kind prior art is calculated, general reference value during only as the focal length of adjusting tight shot.
Summary of the invention
Therefore fundamental purpose of the present invention is to provide a kind of focusing test device and focusing platform of adjustable image sensing module focal length, to solve the problem of prior art.
Focusing test device disclosed by the invention comprises a pedestal, a location device, and a gear set, one contains the movable image sensing module of camera lens, and a stepper motor.This image sensing module is seated in this pedestal under the focusing test mode, when finishing test, can take out from pedestal.Locating device borrows pilot hole to be connected in this camera lens, is used for locating this image sensing module.This gear set is connected in this locating device, in order to drive this locating device.This stepper motor is then in order to drive this gear set.
Focusing platform disclosed by the invention comprises an image sensing module and a focusing test device.This image sensing module comprises a lens set and a sensor, is used for the light that sensing transmits via this lens set.This focusing test device comprises a bottom base, a top base, a location device, a gear set, and a stepper motor.One side of this top base is fixed in a side of this bottom base in rotating mode.This locating device borrows pilot hole to be connected in this camera lens, is used for locating an image sensing module.This gear set is connected in this locating device, in order to drive this locating device.This stepper motor is then in order to drive this gear set.
Description of drawings
Fig. 1 is the synoptic diagram of a focusing test device among the present invention.
Fig. 2 is the top view of Fig. 1 focusing test device.
Fig. 3 is the synoptic diagram of the circuit board fixing device of Fig. 1 focusing test device.
Fig. 4 is the synoptic diagram of Fig. 1 the 3rd gear and locating device.
Fig. 5 is the top view of Fig. 4 locating device.
Fig. 6 is the functional block diagram of a Fig. 1 focusing test device and an image processor.
Fig. 7 adjusts the process flow diagram of focal length for Fig. 1 focusing test device.
The primary clustering symbol description
10 focusing test devices, 12 stepper motors
14 bases, 15 image sensing module camera lenses
20 gear sets, 21 first gears
22 second gears 23 the 3rd gear
30 circuit board fixing devices, 32 bolt-locks
34 top bases, 36 bottom bases
40 image sensing modules, 41 locating devices
43 pilot holes, 44 jacks
46 register pins, 60 image processors
62 digital signal processors, 64 modulation transfer function counters
66 modulation transfer function comparers, 68 controllor for step-by-step motor
Embodiment
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of a focusing test device 10 among the present invention.Focusing test device 10 comprises a stepper motor 12, one gear sets 20, one circuit board fixing devices 30, one location devices 41, and a base 14.Gear set 20 comprises one first gear, 21, one second gears 22 and one the 3rd gear 23.
Please refer to Fig. 2, Fig. 2 is the top view of focusing test device 10.Fig. 2 can more clearly illustrate the structure of gear set 20.First gear 21 is located on the stepper motor 12, and the 3rd gear 23 is located on the circuit board fixing device 30, and second gear 22 is arranged between first gear 21 and the 3rd gear 23.The mode that stepper motor 12 drives focusing test device 10 is at first to drive first gear, 21, the first gears 21 to drive second gear 22 again, drives the 3rd gear 23 by second gear 22 more at last.Present embodiment middle gear group 20 comprises three gears: first gear, 21, the second gears 22 and the 3rd gear 23.Yet the number of middle gear group 20 of the present invention is according to different structure or design, can comprise the gear of two or other number.
Please refer to Fig. 3, Fig. 3 is the synoptic diagram of circuit board fixing device 30.Circuit board fixing device 30 comprises a bolt-lock 32, one top bases 34, and a bottom base 36.The camera lens coupling of top base 34 and image sensing module 40, a side of top base 34 is fixed on a side of bottom base 36 in rotating mode, can the lock opposite side of top base 34 and bottom base 36 of bolt-lock 32.In the circuit board fixing device 30 in Fig. 3, bolt-lock 32 is opening, and meaning is that top base 34 only has a side to be connected with bottom base 36, and the opposite side of top base 34 and bottom base 36 opens and is an angle, so can settle image sensing module 40 easily.After image sensing module 40 arrangements are finished, opposite side by bolt-lock 32 locking top bases 34 and bottom base 36, so circuit board fixing device 30 can provide image sensing module 40 not to be subject to the test environment of external environmental interference, reduce the influence that parameter such as automatic exposure or Automatic white balance changes in the test process, and then improve the accuracy of focusing.According to focusing test device different structure or design, the circuit board fixing device 30 among the present invention can have the design of different outward appearances or locking mode.
Please refer to Fig. 4, Fig. 4 illustrates the connected mode of locating device 41 and the 3rd gear 23.Locating device 41 has one or more jack 44, the three gears 23 and is provided with one or more corresponding register pins 46, is used for engaging with jack 44.After register pin 46 inserted jack 44, locating device 41 can be linked to the 3rd gear 23, and at this moment by gear set, stepper motor 12 rotatable the 3rd gears 23 are to drive locating device 41.Locating device 41 also has a pilot hole 43, can settle the camera lens of image sensing module 40.
Please refer to Fig. 5, Fig. 5 is the top view of locating device 41.Pilot hole 43 can change different geometries, and to cooperate the lens shape of different images sensing module 40, in the present embodiment, the camera lens of imaginary image sensing module 40 is circular, so pilot hole 43 also is designed to circle.Yet at the image sensing module of other different lens shape, pilot hole 43 also can be designed to other different geometries.
Therefore, in the focusing test process, the camera lens of image sensing module 40 is connected in locating device 41; When stepper motor rotated, driven gear group, and the binding of jack 44 on the register pin on the 3rd gear 23 46 and the locating device 41 driving locating device 41, and were rotated the camera lens of image sensing module 40 simultaneously.
Please refer to Fig. 6, Fig. 6 is the functional block diagram of focusing test device 10 of the present invention and image processor 60.Focusing test device 10 is coupled in image processor 60, is used for handling the image of image sensing module institute sensing.Image processor 60 can be an Application Specific Integrated Circuit (applicationspecific integrated circuit, ASIC), comprise a digital signal processor (digital signalprocessor, DSP) 62, one modulation transfer function counter (modulation transfer functioncalculator, MTF calculator) 64, one modulation transfer function comparer (modulation transferfunction comparator, MTF comparator) 66, and one controllor for step-by-step motor 68.Focusing test device 10 is when running, utilize stepper motor 12 to adjust the focal length of an image sensing module camera lens 15 earlier, digital signal processor 62 receives and handles the received signal of video signal of when this focal length image sensing module camera lens 15, next modulation transfer function counter 64 calculates the modulation transfer function of this signal of video signal, and modulation transfer function comparer 66 judges whether to obtain the modulation transfer function of tool optimum value again.If can obtain the modulation transfer function of tool optimum value, 68 modulation transfer functions with this tool optimum value of controllor for step-by-step motor reach stepper motor 12, the position when stepper motor 12 is adjusted the modulation transfer function that the focal length of image sensing module 15 so far has optimum value according to this; If can't obtain the modulation transfer function of tool optimum value, stepper motor 12 is adjusted the focal length of image sensing module 15 once again, till modulation transfer function comparer 66 can be judged the modulation transfer function of providing optimum value.
Please refer to Fig. 7, Fig. 7 is the process flow diagram that focusing test device 10 of the present invention is adjusted image sensing module 40 focal lengths.Fig. 7 comprises the following steps:
Step 700: image sensing module 40 is placed in focusing test device 10;
Step 710: automatic exposure value and the Automatic white balance value of adjusting image sensing module 40;
Step 720: adjust stepper motor 12 with a predetermined step number and a predetermined direction, to adjust the focal length of image sensing module camera lens 15;
Step 730: calculate and note down after the adjustment of stepper motor 12, the modulation transfer function of the image of 40 sensings of image sensing module;
Step 740: the modulation transfer function that judges whether to obtain the tool optimum value; If yes, execution in step 750; If not, execution in step 720;
Step 750: the focal position of image sensing module camera lens 15 is back to stepper motor 12 during the modulation transfer function that will have optimum value; And
Step 760: the position of the focal length that stepper motor 12 is adjusted image sensing module camera lenses 15 during to modulation transfer function with optimum value.
In the process flow diagram of Fig. 7, the present invention adopts modulation transfer function to judge the pinpointed focus of image sensing module.Yet the present invention also can adopt other parameter to judge the pinpointed focus of image sensing module.
The test environment that focusing test device 10 of the present invention provides image sensing module not to be subject to external environmental interference to predetermined value, reduces the influence that these parameters are exchanged the pyrogene accuracy in the preceding parameters such as automatic exposure or Automatic white balance of adjusting earlier of focusing.Utilize the stepping characteristic of stepper motor again, accurately adjust the focal length of image sensing module with a predetermined step number, again by program and image processor, dynamic calculation also is recorded in the modulating transfer function value of image sensing module after the adjustment of each predetermined step number, judge the focal length of image sensing module when having optimum value, again this position is back to stepper motor at last, the focal length when transferring to modulation transfer function with optimum value with focal length with image sensing module.
Prior art adopts the mode of adjusting focal length manually to adjust the focal length of tight shot.Yet the accuracy of focusing of prior art often varies with each individual, or easily is subjected to the influence that parameters such as automatic exposure or Automatic white balance change in test process.Compared to prior art, focusing test device of the present invention utilizes stepper motor accurately to adjust image sensing module, so can get rid of the error of artificial focusing; Judge focal length by program and image processor again, so can get rid of the difference of artificial judgment with best test value.The test environment that focusing test device 10 of the present invention provides image sensing module not to be subject to external environmental interference, and in the preceding parameters such as automatic exposure or Automatic white balance of adjusting earlier of focusing to predetermined value, so can reduce the influence that test environment is exchanged the pyrogene accuracy.The invention provides a robotization, accurately, the stable and test platform of focusing cheaply.
The above only is preferred embodiment of the present invention, and is all according to equalization variation and modification that the present invention did, all should belong to covering scope of the present invention.
Claims (20)
1. the focusing test device of an adjustable image sensing module focal length, it comprises:
One pedestal;
One comprises the movable image sensing module of camera lens, under the focusing test mode, is seated in this pedestal, finishes test, can take out from pedestal;
One location device under the focusing test mode, links with this camera lens, finishes test, can separate with this camera lens;
One gear set is connected in this locating device, in order to drive this locating device; And
One stepper motor is used for driving this gear set.
2. focusing platform according to claim 1 is characterized in that wherein this locating device includes a pilot hole, and it can change different geometries, to cooperate difform image sensing module camera lens.
3. focusing platform according to claim 1 is characterized in that, wherein this gear set comprises an integrated positioning pin, and this locating device comprises a pilot hole, is used for engaging with this integrated positioning pin.
4. focusing platform according to claim 1 is characterized in that, wherein this camera lens is for focusing the formula camera lens.
5. focusing platform according to claim 1 is characterized in that it comprises an image processor in addition, is coupled in this image sensing module, is used for handling the image of this image sensing module institute sensing.
6. focusing platform according to claim 5 is characterized in that, wherein this image processor is an Application Specific Integrated Circuit.
7. focusing platform according to claim 5 is characterized in that wherein this image processor comprises a digital signal processor.
8. focusing platform according to claim 5 is characterized in that, wherein this image processor comprises a modulation transfer function counter.
9. focusing platform according to claim 8 is characterized in that, wherein this image processor comprises a modulation transfer function comparer.
10. focusing platform according to claim 9 is characterized in that, wherein after this image sensing module is fixed in this locating device, adjusts the automatic exposure value and the Automatic white balance value of this image sensing module.
11. focusing platform according to claim 10 is characterized in that, it is after the automatic exposure value and Automatic white balance value of adjusting this image sensing module, and this gear set of this step motor drive is to adjust the focal length of this image sensing module.
12. focusing platform according to claim 11, it is characterized in that, it is after this gear set of this step motor drive is with the focal length of adjusting this image sensing module, calculate and note down the modulation transfer function of the image of this image sensing module institute sensing, and judge whether this modulation transfer function is optimum value.
13. focusing platform according to claim 12 is characterized in that, it is after judging the modulation transfer function of optimum value, and the focal length of this image sensing module is back to this stepper motor during with the modulation transfer function of tool optimum value.
14. focusing platform according to claim 13, it is characterized in that, after the focal length of its this image sensing module with the modulation transfer function of tool optimum value the time is back to this stepper motor, the position when this stepper motor transfers to the modulation transfer function of tool optimum value with the focal length of this image sensing module.
15. the focusing platform of an adjustable image sensing module focal length, it comprises:
One image sensing module, it comprises a lens set and a sensor, is used for the light that sensing transmits via this lens set; And
One focusing test device, it comprises:
One bottom base;
One top base can engage with this bottom base and separate, and does the relative motion of folding;
One location device can engage with this lens set and separate, in order to locate this image sensing module;
One gear set is connected in this locating device, in order to drive this locating device; And
One stepper motor is in order to drive this gear set.
16. focusing platform according to claim 15 is characterized in that, wherein this locating device includes a pilot hole, and it can change different geometries, to cooperate difform image sensing module camera lens.
17. focusing platform according to claim 15 is characterized in that, wherein this gear set comprises an integrated positioning pin, and this locating device comprises a pilot hole, is used for engaging with this integrated positioning pin.
18. focusing platform according to claim 15 is characterized in that, wherein this top base one side is fixed in a side of this bottom base in rotating mode.
19. focusing platform according to claim 15 is characterized in that, wherein this focusing test device comprises a bolt-lock in addition, is located at a side of this top base, in order to combine with a side of this bottom base, with this top base and this bottom base of locking.
20. focusing platform according to claim 15 is characterized in that, wherein this lens set is for focusing the formula lens set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510089779.XA CN1912669A (en) | 2005-08-09 | 2005-08-09 | Focusing test device capable of regulating focus of image sensing module and focusing platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200510089779.XA CN1912669A (en) | 2005-08-09 | 2005-08-09 | Focusing test device capable of regulating focus of image sensing module and focusing platform |
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| Publication Number | Publication Date |
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| CN1912669A true CN1912669A (en) | 2007-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200510089779.XA Pending CN1912669A (en) | 2005-08-09 | 2005-08-09 | Focusing test device capable of regulating focus of image sensing module and focusing platform |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872059A (en) * | 2010-06-18 | 2010-10-27 | 南京理工大学 | Automatic focusing system and method thereof of OTF (Optical Transfer Function) tester |
| CN102375291A (en) * | 2010-08-10 | 2012-03-14 | 昆山钜亮光电科技有限公司 | Coaxial synchronous automatic focus light box mechanism of camera module |
| CN103212815A (en) * | 2012-01-19 | 2013-07-24 | 昆山思拓机器有限公司 | Multispectral photoelectric focus finder |
| CN105025220A (en) * | 2014-04-30 | 2015-11-04 | 聚晶半导体股份有限公司 | Multi-lens image adjusting system and method |
| CN107404611A (en) * | 2017-08-17 | 2017-11-28 | 信利光电股份有限公司 | A kind of electronic equipment, camera module and its assemble method |
| CN111580336A (en) * | 2020-04-21 | 2020-08-25 | 福建福光股份有限公司 | Focusable camera inspection jig |
| EP3780574B1 (en) * | 2019-08-15 | 2024-03-06 | Beijing Xiaomi Mobile Software Co., Ltd. | Camera module, terminal device and image capturing method |
-
2005
- 2005-08-09 CN CN200510089779.XA patent/CN1912669A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872059A (en) * | 2010-06-18 | 2010-10-27 | 南京理工大学 | Automatic focusing system and method thereof of OTF (Optical Transfer Function) tester |
| CN102375291A (en) * | 2010-08-10 | 2012-03-14 | 昆山钜亮光电科技有限公司 | Coaxial synchronous automatic focus light box mechanism of camera module |
| CN102375291B (en) * | 2010-08-10 | 2014-11-05 | 昆山钜亮光电科技有限公司 | Coaxial synchronous automatic focus light box mechanism of camera module |
| CN103212815A (en) * | 2012-01-19 | 2013-07-24 | 昆山思拓机器有限公司 | Multispectral photoelectric focus finder |
| CN103212815B (en) * | 2012-01-19 | 2016-02-24 | 昆山思拓机器有限公司 | The burnt device of multispectral Photoelectric |
| CN105025220A (en) * | 2014-04-30 | 2015-11-04 | 聚晶半导体股份有限公司 | Multi-lens image adjusting system and method |
| CN105025220B (en) * | 2014-04-30 | 2018-04-06 | 聚晶半导体股份有限公司 | The image adjustment system and its method of more camera lenses |
| CN107404611A (en) * | 2017-08-17 | 2017-11-28 | 信利光电股份有限公司 | A kind of electronic equipment, camera module and its assemble method |
| EP3780574B1 (en) * | 2019-08-15 | 2024-03-06 | Beijing Xiaomi Mobile Software Co., Ltd. | Camera module, terminal device and image capturing method |
| CN111580336A (en) * | 2020-04-21 | 2020-08-25 | 福建福光股份有限公司 | Focusable camera inspection jig |
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