CN104052932A - Rapidly-focusing mobile phone camera shooting module - Google Patents
Rapidly-focusing mobile phone camera shooting module Download PDFInfo
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- CN104052932A CN104052932A CN201410314039.0A CN201410314039A CN104052932A CN 104052932 A CN104052932 A CN 104052932A CN 201410314039 A CN201410314039 A CN 201410314039A CN 104052932 A CN104052932 A CN 104052932A
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- focusing
- microprocessing unit
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- camera lens
- distance measuring
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/67—Focus control based on electronic image sensor signals
- H04N23/673—Focus control based on electronic image sensor signals based on contrast or high frequency components of image signals, e.g. hill climbing method
Abstract
The invention discloses a rapidly-focusing mobile phone camera shooting module which comprises a microprogrammed control unit, a lens, a focusing motor for driving the lens to move and a distance measuring sensor. The microprogrammed control unit is used for obtaining a signal of the distance measuring sensor, calculating the focusing position of the lens and controlling the focusing motor to drive the lens to move to the focusing position for focusing. By means of the rapidly-focusing mobile phone camera shooting module, mobile phone system sources are not occupied, the focusing position of the lens can be accurately obtained, and ultra-fast focusing of a mobile phone can be achieved.
Description
Technical field
The present invention relates to camera module, relate in particular to a kind of camera module of the rapid focus for mobile phone.
Background technology
People wish to capture excellent fine moment in the time taking pictures, only have at present professional camera to be just equipped with the camera module of focusing speed, and the focusing speed of existing smart mobile phone does not catch up with always, therefore the automatic focusing speed that, how to improve mobile phone photograph is these those skilled in the art's primary problem always.
Smart mobile phone adopts the contrast method of traditional passive type to focus at present, it is direct receiving and analyzing scene image, find out the Atomatic focusing method of best focus lens position by contrasting the contrast of different lens location images. the advantage of this automatic focusing mode is: self does not want emission system, thereby power consumption is few, be conducive to miniaturization, therefore can be applied on the portable mobile termianls such as smart mobile phone.Although this traditional focusing mode can be focused automatically, but, around ambient light a little less than, or can not realize good focusing in the low situation of luminance contrast, to hachure, containing polarisation, the subject of black or minute surface is also focused more difficult, even and if in the situation that light environment is pretty good, focusing speed is also quite slow, because contrast ratio juris has determined that it must rely on repeatedly and has utilized differential technique successively to approach after moving lens just to find the best focusing position of camera lens, and repeatedly moving lens need to expend a lot of time, but people have again certain requirement for the focusing time in actual shooting process, if focusing overlong time, often just miss excellent moment, cause sorry.
Summary of the invention
The present invention is in order to solve in above-mentioned prior art the mobile phone slow-footed technical problem of focusing, a kind of cell-phone camera module of rapid focus is proposed, integrated microprocessing unit in this cell-phone camera module, camera lens, drive the focusing motor of camera motion, the parts such as imageing sensor, distance measuring sensor is measured the distance of testee, then microprocessing unit calculates the focusing position of camera lens by the data of distance measuring sensor, controlling focusing motor drives camera motion to focusing position to focus, because the present invention has configured separately microprocessing unit in cell-phone camera module, make cell-phone camera module not take the system resource of mobile phone, therefore can greatly improve the focusing speed of cell-phone camera module, capture thereby realize, mobile object chase after the functions such as bat, and all only have mm professional camera special just can realize before these functions.
The present invention has improved the integrated level of cell-phone camera module greatly, because distance measuring sensor and camera lens are all integrated on a module plate, makes both distances can reach minimum, has realized and has reduced to the full extent the probability that while taking pictures, distance measuring sensor is blocked by hand.
The present invention is compared with current other range finding focusing technology, and as dual camera ranging technology, the present invention processes computing without carrying out image, and this is also that the present invention realizes one of reason of very fast focusing, and does not more need occupying system resources.The present invention is compared with other shooting mobile phones with discrete range finder module, integrated level of the present invention is higher, volume is less, the distance minimum of distance measuring sensor and camera, therefore, the present invention has reduced the volume of active focusing camera module to the full extent, promote the miniaturization growth requirement of electronic equipment, the present invention can be applied in various thin and thick differences, and on the different mobile phone of width, application prospect is very extensive.
In technical scheme of the present invention, microprocessor receives the signal that distance measuring sensor transmits, calculate the distance of camera lens and distance measuring sensor according to formula 1/u+1/v=1/f, controlling lens moving to the position of distance measuring sensor focuses, wherein, u is the distance between subject and distance measuring sensor, and v is the distance between camera lens and distance measuring sensor, the effective focal length that f is camera lens.The present invention can adopt different focusing motor, different distance measuring sensors to realize object of the present invention as required.
Brief description of the drawings
Fig. 1 is first embodiment of the present invention schematic diagram;
Fig. 2 is second embodiment of the present invention schematic diagram;
Fig. 3 is third embodiment of the present invention schematic diagram.
Embodiment
Below in conjunction with meeting detailed description specific embodiments of the invention; following specific embodiment is only in order to illustrate design of the present invention; those of ordinary skill in the art can make various deformation and variation under design of the present invention, and these distortion and variation include within protection scope of the present invention.
The present invention is mainly made up of three core components: camera system, comprise the parts such as imageing sensor, focusing motor and camera lens, this camera system can utilize focusing motor adjustment, change the position of camera lens, to realize the functions such as focusing under the control of microprocessing unit; Distance measuring sensor, its detection-sensitive distance is several centimetres to several meters scopes far away, just in time covers nearly Jiao and the burnt scope far away of camera lens; Microprocessing unit (MCU), this microprocessing unit can calculate the shooting distance between subject and camera lens by distance measuring sensor.The functional relation of MCU is built-in shooting distance and focus lens position, therefore can obtain the accurate focusing position of corresponding camera lens according to distance measuring sensor.And then MCU controls focusing motor camera lens is raised to this focusing position, realizes active very fast focusing.
Fig. 1 shows the first embodiment of the present invention, in this embodiment, focusing motor adopts open loop type autofocus motor, microprocessing unit control distance measuring sensor sends light pulse signal or ultrasonic pulse signal, these signals run into testee and are reflected back, then distance measuring sensor receives these pulse signals again, and microprocessing unit can analytical calculation go out the distance between camera lens and subject according to twice pulse signal.Then calculate the position of distance of camera lens imageing sensor according to formula 1/u+1/v=1/f, in this formula, u is the distance of camera lens and subject, and v is the distance of camera lens and imageing sensor, and f is the effective focal length of camera lens 4.Then then microprocessing unit utilizes the fundamental characteristics of focusing motor, i.e. the relation of electric current and travel position gives open loop type autofocus motor the logical suitably electric current of size, camera lens is settled at one go to the position that is raised to imageing sensor, realizes accurately focusing.Because can making camera lens, the spring oscillator structure of open loop type autofocus motor easily vibrates in its equilbrium position afterwards in very fast movement, cause image blurring, therefore microprocessing unit can built-in intelligence leg speed control (ISRC) algorithm, according to the resonance frequency of open loop type autofocus motor self and Q value, selecting suitable mobile leg speed to control motor moves into place, alleviate to the full extent the impact of resonance, improve focusing speed.
Fig. 2 shows the second embodiment of the present invention, in this embodiment, focusing motor adopts closed loop focusing motor, the built-in Hall element of closed loop focusing motor, the position signalling of camera lens is sent to microprocessing unit, and microprocessing unit utilizes the movement of closed-loop control camera lens.The lens shift phenomenon that the factors such as the closed loop control method of the second embodiment can effectively avoid camera lens to resonate, attitude is poor cause, can obtain the more focusing of fast accurate.
Fig. 3 shows the third embodiment of the present invention, focusing motor adopts multiaxis focusing motor, microprocessing unit is electrically connected for detection of the gyroscope of photographer's hand shake with one, this gyroscope can be integrated in module together with the parts such as microprocessing unit, also can allow the gyroscope of microprocessing unit and module outside set up instant communication, the information that microprocessing unit is trembled by receiving gyrostatic signal acquisition photographer hand, then drive camera lens to carry out the translation in X and Y-direction according to built-in OIS algorithm control multiaxis focusing motor, eliminate the hand judder causing that shakes, make cell-phone camera module realize optics anti-shake (OIS) function.
In the middle of above-mentioned three specific embodiments, the distance measuring sensor of employing, can select ultrasonic probe or photoelectric type probe, and those skilled in the art also can select other probes as required.While adopting ultrasonic probe, microprocessing unit can send a pulse signal to ultrasonic probe, excitation ultrasonic probe sends pulse resonance ultrasonic wave, pulse resonance ultrasonic wave is reflected back while running into subject, received by this ultrasonic probe again, microprocessing unit can be according to two hyperacoustic time differences of subresonance, and the aerial speed of binding resonant ultrasonic wave just can calculate the distance of subject.If adopt photoelectric type probe, this photoelectric type probe comprises an infrared focusing light-emitting diode and an infrared photodiode.First microprocessing unit is controlled infrared focusing light-emitting diode and is sent high frequency modulated infrared light, modulating frequency need be at 10MHz to 20MHz left and right, this high frequency modulated infrared light runs into subject reflection afterwards by infrared photodiode is received, and transfers the high frequency electrical signal of same frequency to.Can there is phase shift in the high frequency modulated infrared signal of this high frequency electrical signal and transmitting, phase-shift phase is directly proportional to the distance of subject in phase place.Microprocessing unit, according to the phase place of the high frequency electrical signal of the high frequency modulated infrared signal of relatively launching and reception, can calculate the accurate location of subject.
The present invention is integrated in distance measuring sensor in cell-phone camera module, and carries various focusing motor, realizes the very fast focusing of mobile phone camera, meets the demand that people capture, snap.
Claims (8)
1. the cell-phone camera module of a rapid focus, comprise the focusing motor of microprocessing unit, imageing sensor, camera lens, driving camera motion, it is characterized in that: also comprise a distance measuring sensor, described microprocessing unit obtains the signal of distance measuring sensor, calculate the focusing position of camera lens, and control focusing motor drive lens moving to focusing position and focus.
2. the cell-phone camera module of rapid focus as claimed in claim 1, it is characterized in that: described microprocessor receives the signal that distance measuring sensor transmits, calculate the distance of camera lens and imageing sensor according to formula 1/u+1/v=1/f, controlling lens moving to the position of imageing sensor focuses, wherein, u is the distance between subject and distance measuring sensor, and v is the distance between camera lens and imageing sensor, the effective focal length that f is camera lens.
3. the cell-phone camera module of rapid focus as claimed in claim 2, is characterized in that: described focusing motor is open loop type autofocus motor, and described microprocessor, according to the resonance frequency of open loop type autofocus motor self and Q value, is controlled the movement of motor.
4. the cell-phone camera module of rapid focus as claimed in claim 2, it is characterized in that: described focusing motor adopts closed loop focusing motor, the built-in Hall element of described closed loop focusing motor, the position signalling of camera lens is sent to microprocessing unit, and microprocessing unit utilizes the movement of closed-loop control camera lens.
5. the cell-phone camera module of rapid focus as claimed in claim 2, it is characterized in that: described focusing motor adopts multiaxis focusing motor, described microprocessing unit is electrically connected for detection of the gyroscope of shake with one, microprocessing unit receives gyrostatic signal, drive camera lens to move according to anti-shake algorithm control multiaxis focusing motor, eliminate the judder that shake causes.
6. the cell-phone camera module of the rapid focus as described in claim 3 to 5 any one, it is characterized in that: described distance measuring sensor adopts ultrasonic probe, the resonance ultrasonic wave that described microprocessing unit sends according to ultrasonic probe, and time difference between the resonance ultrasonic wave being reflected that receives of ultrasonic probe, calculate the distance of subject.
7. the cell-phone camera module of the rapid focus as described in claim 3 to 5 any one, it is characterized in that: described distance measuring sensor adopts photoelectric type probe, described photoelectric type probe comprises infrared focusing light-emitting diode and infrared photodiode, described microprocessing unit sends high frequency modulated infrared light according to infrared focusing light-emitting diode, and phase shift between the high frequency modulated infrared light being reflected by subject that receives of infrared photodiode, calculate the distance of subject.
8. the cell-phone camera module of rapid focus as claimed in claim 7, is characterized in that: the modulation frequency range of described high frequency modulated infrared light is 10MHz ~ 20MHz.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410314039.0A CN104052932A (en) | 2014-07-03 | 2014-07-03 | Rapidly-focusing mobile phone camera shooting module |
| PCT/CN2015/081775 WO2016000533A1 (en) | 2014-07-03 | 2015-06-18 | Fast focusing shooting module in mobile phone |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410314039.0A CN104052932A (en) | 2014-07-03 | 2014-07-03 | Rapidly-focusing mobile phone camera shooting module |
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| CN104052932A true CN104052932A (en) | 2014-09-17 |
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| CN201410314039.0A Pending CN104052932A (en) | 2014-07-03 | 2014-07-03 | Rapidly-focusing mobile phone camera shooting module |
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| WO (1) | WO2016000533A1 (en) |
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Application publication date: 20140917 |