CN102006419B - Mobile terminal with automatic focusing driving circuit and driving circuit thereof - Google Patents
Mobile terminal with automatic focusing driving circuit and driving circuit thereof Download PDFInfo
- Publication number
- CN102006419B CN102006419B CN201010285292XA CN201010285292A CN102006419B CN 102006419 B CN102006419 B CN 102006419B CN 201010285292X A CN201010285292X A CN 201010285292XA CN 201010285292 A CN201010285292 A CN 201010285292A CN 102006419 B CN102006419 B CN 102006419B
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- Prior art keywords
- triode
- drive circuit
- portable terminal
- operational amplifier
- camera
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- 230000002708 enhancing effect Effects 0.000 abstract 1
- 230000003321 amplification Effects 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 4
- 230000010354 integration Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 230000007704 transition Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
- G03B3/10—Power-operated focusing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0053—Driving means for the movement of one or more optical element
- G03B2205/0069—Driving means for the movement of one or more optical element using electromagnetic actuators, e.g. voice coils
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Lens Barrels (AREA)
Abstract
The invention discloses a mobile terminal with an automatic focusing driving circuit and a driving circuit thereof. The mobile terminal comprises a base band chip, a driving circuit, a voice coil motor and a camera, wherein the driving circuit comprises an integrating circuit, an operational amplifier and a triode; the output end of the base band chip is connected with the reverse input end of the operational amplifier through the integrating circuit; the positive input end of the operational amplifier is connected with the collecting electrode of the triode; the output end of the operational amplifier is connected with the base electrode of the triode; the collecting electrode of the triode is grounded through a first resistor; and the emitting electrode of the triode is connected with the camera through the voice coil motor. A current on the collecting electrode of the triode is adjusted by adjusting the duty ratio of the base band chip, thereby controlling the current flowing through the voice coil motor and enhancing the automatic focusing speed of the camera; furthermore, the mobile terminal uses a few of electronic elements, so the circuit structure is simple, and the cost of the mobile terminal is reduced.
Description
Technical field
The present invention relates to the focusing technology of mobile terminal camera, particularly a kind of portable terminal and drive circuit thereof with automatic focusing drive circuit.
Background technology
At present, camera has become a kind of conventional accessory of mobile phone terminal, along with the user improves the requirement of mobile phone cam pixel resolution and shooting clear degree, when producing mobile phone, also can dispose a high-resolution camera.
Camera is when surpassing two mega pixels, and generally all with (AF-auto focus) device of automatically focusing, the picture that camera is taken is clear.Automatic focusing mechanism (at present commonly used is at the inner integrated voice coil motor of camera) gathers the focal length of camera lens by the light of adjusting the camera front end, realizes the variation of focal length, to reach the purpose of obtaining picture rich in detail.And the focal length of control camera is to realize by the electric current that control is flow through in the voice coil motor, and the angle of the size of electric current decision voice coil motor rotation, thereby can realize focusing.
Usually need a drive circuit to control the size of electric current for automatic focusing mechanism, traditional way generally can adopt the IC chip (integrated circuit, integrated circuit) of a special use to realize, and the I of this IC chip
2C interface is connected with the baseband chip interface of mobile phone, and chip internal need to dispose a DAC module (digital analog converter).But, use this drive IC to have following two shortcomings:
The first, because the inner configuration DAC module that needs of IC makes the price comparison of chip high; The second, the interface of this chip and mobile phone base band chip is I
2C interface is because I
2C interface is a kind of serial line interface, and it has the complete agreement of a cover, just because of it is a kind of serial line interface, thus exist the rate request in this chip controls transmission, but I
2The maximum speed of C is 400Kbps, and this speed can affect the control rate of automatic focusing mechanism, and then affects the time of camera focusing.
Thereby the focusing technology of existing mobile terminal camera is still waiting to improve and improve.
Summary of the invention
In view of above-mentioned the deficiencies in the prior art part, the object of the present invention is to provide a kind of portable terminal with automatic focusing drive circuit, can improve the speed of lens focusing.
In order to achieve the above object, the present invention has taked following technical scheme:
A kind of portable terminal with automatic focusing drive circuit, it comprises baseband chip, drive circuit, voice coil motor and camera, wherein, described drive circuit comprises integrating circuit, operational amplifier and triode; The output of described baseband chip is connected with the reverse input end of described operational amplifier by integrating circuit, and the positive input of operational amplifier connects the collector electrode of described triode, the base stage of output connecting triode; The collector electrode of triode is by the first grounding through resistance, and emitter connects camera by described voice coil motor.
Described portable terminal with automatic focusing drive circuit, wherein, described integrating circuit comprises the second resistance and electric capacity, described the second resistance string is associated between the reverse input end of described baseband chip and operational amplifier, one end of described electric capacity is connected other end ground connection with the output of described the second resistance.
Described portable terminal with automatic focusing drive circuit, wherein, described triode is the PNP triode.
Described portable terminal with automatic focusing drive circuit, wherein, described portable terminal is mobile phone.
The present invention also aims to provide a kind of drive circuit of portable terminal lens focusing, wherein, described baseband chip, drive circuit, voice coil motor and camera, described drive circuit comprises integrating circuit, operational amplifier and triode; The output of described baseband chip is connected with the reverse input end of described operational amplifier by integrating circuit, and the positive input of operational amplifier connects the collector electrode of described triode, the base stage of output connecting triode; The collector electrode of triode is by the first grounding through resistance, and emitter connects camera by described voice coil motor.
The drive circuit of described portable terminal lens focusing, wherein, described integrating circuit comprises the second resistance and electric capacity, described the second resistance string is associated between the reverse input end of described baseband chip and operational amplifier, one end of described electric capacity is connected other end ground connection with the output of described the second resistance.
The drive circuit of described portable terminal lens focusing, wherein, described triode is the PNP triode.
The drive circuit of described portable terminal lens focusing, wherein, described portable terminal is mobile phone.
A kind of portable terminal and drive circuit thereof with automatic focusing drive circuit provided by the invention, its portable terminal comprises baseband chip, drive circuit, voice coil motor and camera, and described drive circuit comprises integrating circuit, operational amplifier and triode, the voltage transitions that portable terminal is exported baseband chip by integrating circuit is aanalogvoltage, by operational amplifier the voltage of its positive input and reverse input end is carried out the electric current that differential amplification is controlled triode again, and the voltage of amplifier reverse input end is regulated recently by the PWM duty of baseband chip.The present invention recently regulates the electric current of transistor collector by the duty of adjusting baseband chip, thereby controlled the electric current that flows through voice coil motor, improved the automatically speed of focusing of camera, and the electronic devices and components that portable terminal uses have been few, circuit structure is simple, has reduced the cost of portable terminal.
Description of drawings
The structured flowchart of the portable terminal that Fig. 1 provides for the embodiment of the invention;
The circuit theory diagrams of the portable terminal that Fig. 2 provides for the embodiment of the invention.
Embodiment
The invention provides a kind of portable terminal and drive circuit thereof with automatic focusing drive circuit, by operational amplifier the voltage of its positive input and reverse input end is carried out differential amplification, thereby the electric current of transistor collector is flow through in control, and the voltage of operational amplifier reverse input end is by pwm signal (the Pulse Width Modulation of baseband chip output, pulse width modulation) regulate, improved the automatically speed of focusing of portable terminal.
For making purpose of the present invention, technical scheme and effect clearer, clear and definite, the present invention is described in more detail referring to the accompanying drawing examples.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
See also Fig. 1 and Fig. 2, the portable terminal that the embodiment of the invention provides comprises baseband chip 110, drive circuit 120, voice coil motor 130 and camera 140, and described baseband chip 110, drive circuit 120, voice coil motor 130 are connected with drive circuit successively and are connected.
Wherein, described drive circuit 120 is used for realizing camera fast, thereby focusing makes camera obtain clearly picture automatically, this drive circuit 120 comprises integrating circuit 121, operational amplifier A 1 and triode Q1, described baseband chip 110 is connected with the reverse input end of operational amplifier A 1 by integrating circuit 121, the positive input of operational amplifier A 1 connects the collector electrode of described triode Q1, the base stage of the output connecting triode Q1 of operational amplifier A 1; The collector electrode of described triode Q1 is by the first resistance R 1 ground connection, and the emitter of triode Q1 connects voice coil motor 130, and described voice coil motor 130 is connected with described camera 140.
In the present embodiment, described drive circuit can be made an integrated chip, thereby dwindles the volume of portable terminal, and portable terminal is mobile phone, and baseband chip 110 is for generation of pwm signal, and its frequency is between 500Hz～20KHz.Described operational amplifier A 1 adopts the close loop negative feedback amplifier, and its main purpose is that the voltage with the voltage of its positive input and reverse input end carries out differential amplification, thus the electric current of control triode Q1 collector electrode.
Please continue to consult Fig. 2, described integrating circuit 121 comprises the second resistance R 2 and capacitor C 1, described the second resistance R 2 is connected between the reverse input end of baseband chip 110 and operational amplifier A 1, and an end of described capacitor C 1 is connected other end ground connection with the output of described the second resistance R 2.
In drive circuit, the pwm signal of baseband chip 110 outputs carries out integration through the second resistance R 2 and capacitor C 1, is aanalogvoltage with the voltage transition behind the integration, exports to the reverse input end of operational amplifier A 1.
Wherein, described triode Q1 is PNP triode (PNP is the model of triode), and mainly plays on-off action in this drive circuit 120, so the resistance of this triode Q1 is very little, can ignore in drive circuit 120.
Below portable terminal that the embodiment of the invention is provided when focusing, the operation principle of its drive circuit is described in detail:
By the pwm signal that baseband chip 110 produces, this pwm signal carries out integration through the second resistance R 2 and capacitor C 1, is aanalogvoltage with the voltage transitions behind the integration.The duty ratio of supposing pwm signal is D, and voltage amplitude is V
Dd, then the aanalogvoltage of the pwm signal conversion that receives of operational amplifier A 1 reverse input end is V
In-=V
Dd* D.
The voltage of operational amplifier A 1 positive input is from the voltage on the first resistance R 1.The electric current of supposing to flow through the first resistance R 1 is I, and then the voltage of operational amplifier A 1 positive input is V
In+=I * R
1
And the purpose of operational amplifier A 1 is the input voltage V with its forward end
In+Input voltage V with backward end
In-Voltage difference amplify, output control triode Q1, its final purpose is control triode Q1 collector current I, so that final electric current
Can find out that from above-mentioned formula the duty of the pwm signal that the electric current of transistor collector can be by baseband chip output is recently regulated, and the electric current of transistor collector also is the electric current that flows through autofocus motor (voice coil motor).
So portable terminal when focusing, can by adjusting the PWM duty ratio of baseband chip 110, change operational amplifier positive input V
In+On voltage, thereby adjust the electric current flow through triode Q1, the electric current of autofocus motor (voice coil motor) is flow through in final control, the fast driving voice coil motor, thereby realize automatically focusing.
Because pwm signal is by baseband chip 110 inner generations, the duty ratio of change PWM only need be revised the register of baseband chip 110 inside and just can realize, the duty ratio that has changed baseband chip just can realize changing the electric current that flows through voice coil motor 130, thereby make the variation of camera 140 focal lengths, realized automatic focusing.
Based on above-mentioned portable terminal, the embodiment of the invention is the drive circuit of corresponding a kind of portable terminal lens focusing also, and this drive circuit is connected between the baseband chip and voice coil motor of portable terminal, is used for changing the electric current that flows through voice coil motor, the realization portable terminal is quick, automatically focusing.Based on above this drive circuit being described in detail, repeat no more herein.
In sum, a kind of portable terminal and drive circuit thereof with automatic focusing drive circuit provided by the invention, its portable terminal comprises baseband chip, drive circuit, voice coil motor and camera, and described drive circuit comprises integrating circuit, operational amplifier and triode, the voltage transitions that described portable terminal is exported baseband chip by integrating circuit is aanalogvoltage, by operational amplifier the voltage of its positive input and reverse input end is carried out that differential amplification is controlled the electric current of triode again and the electric current of transistor collector also is the electric current of voice coil motor, thereby realized automatic focusing.The present invention recently regulates the electric current of transistor collector by the duty of adjusting baseband chip, thereby the electric current of voice coil motor is flow through in control, because the control of electric current does not need to transmit by serial line interface, therefore greatly improved the automatically speed of focusing of camera, and the electronic component that portable terminal uses is few, circuit structure is simple, has reduced the cost of portable terminal.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection range of the appended claim of the present invention.
Claims (8)
1. portable terminal with automatic focusing drive circuit, it comprises baseband chip, drive circuit, voice coil motor and camera, it is characterized in that, described drive circuit comprises integrating circuit, operational amplifier and triode; The output of described baseband chip is connected with the reverse input end of described operational amplifier by integrating circuit, and the positive input of operational amplifier connects the collector electrode of described triode, the base stage of output connecting triode; The collector electrode of triode is by the first grounding through resistance, and emitter connects camera by described voice coil motor.
2. the portable terminal with automatic focusing drive circuit according to claim 1, it is characterized in that, described integrating circuit comprises the second resistance and electric capacity, described the second resistance string is associated between the reverse input end of described baseband chip and operational amplifier, one end of described electric capacity is connected other end ground connection with the output of described the second resistance.
3. the portable terminal with automatic focusing drive circuit according to claim 1 is characterized in that, described triode is the PNP triode.
4. the portable terminal with automatic focusing drive circuit according to claim 1 is characterized in that, described portable terminal is mobile phone.
5. the drive circuit of a portable terminal lens focusing is characterized in that, comprises baseband chip, drive circuit, voice coil motor and camera, and described drive circuit comprises integrating circuit, operational amplifier and triode; The output of described baseband chip is connected with the reverse input end of described operational amplifier by integrating circuit, and the positive input of operational amplifier connects the collector electrode of described triode, the base stage of output connecting triode; The collector electrode of triode is by the first grounding through resistance, and emitter connects camera by described voice coil motor.
6. the drive circuit of portable terminal lens focusing according to claim 5, it is characterized in that, described integrating circuit comprises the second resistance and electric capacity, described the second resistance string is associated between the reverse input end of described baseband chip and operational amplifier, one end of described electric capacity is connected other end ground connection with the output of described the second resistance.
7. the drive circuit of portable terminal lens focusing according to claim 5 is characterized in that, described triode is the PNP triode.
8. the drive circuit of portable terminal lens focusing according to claim 5 is characterized in that, described portable terminal is mobile phone.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010285292XA CN102006419B (en) | 2010-09-17 | 2010-09-17 | Mobile terminal with automatic focusing driving circuit and driving circuit thereof |
| PCT/CN2011/076844 WO2012034443A1 (en) | 2010-09-17 | 2011-07-05 | Mobile terminal having automatic focusing drive circuit and drive circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010285292XA CN102006419B (en) | 2010-09-17 | 2010-09-17 | Mobile terminal with automatic focusing driving circuit and driving circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102006419A CN102006419A (en) | 2011-04-06 |
| CN102006419B true CN102006419B (en) | 2013-01-02 |
Family
ID=43813452
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010285292XA Expired - Fee Related CN102006419B (en) | 2010-09-17 | 2010-09-17 | Mobile terminal with automatic focusing driving circuit and driving circuit thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102006419B (en) |
| WO (1) | WO2012034443A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006419B (en) * | 2010-09-17 | 2013-01-02 | 惠州Tcl移动通信有限公司 | Mobile terminal with automatic focusing driving circuit and driving circuit thereof |
| CN104683587A (en) * | 2015-03-09 | 2015-06-03 | 深圳市欧珀通信软件有限公司 | A mobile terminal and its camera focusing method and device |
| CN112651382B (en) * | 2021-01-15 | 2024-04-02 | 北京中科虹霸科技有限公司 | Focus data calibration system and iris image acquisition system |
| CN118413730B (en) * | 2024-07-01 | 2024-10-01 | 杭州海康威视数字技术股份有限公司 | Aperture driving circuit and camera |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997002300A1 (en) * | 1995-06-30 | 1997-01-23 | E.I. Du Pont De Nemours And Company | Process for making fluoropolymers |
| JP3338322B2 (en) * | 1997-02-25 | 2002-10-28 | 三洋電機株式会社 | Auto focus camera |
| CN100454132C (en) * | 2004-10-11 | 2009-01-21 | 吉佳科技股份有限公司 | Voice coil motor positioning device |
| CN2886610Y (en) * | 2006-03-30 | 2007-04-04 | 天津三星电机有限公司 | Focusing mechanism for cam of mobile phone |
| CN101055342A (en) * | 2006-04-12 | 2007-10-17 | 鸿富锦精密工业（深圳）有限公司 | Automatic focusing lens module group |
| CN100556080C (en) * | 2006-04-27 | 2009-10-28 | 中兴通讯股份有限公司 | A kind of minisize pick-up head method and minisize pick-up head thereof of focusing automatically realized |
| CN101726962B (en) * | 2009-12-10 | 2011-11-09 | 浙江大华技术股份有限公司 | High-precision auto aperture drive circuit |
| CN201813423U (en) * | 2010-09-17 | 2011-04-27 | 惠州Tcl移动通信有限公司 | Mobile terminal with automatic focusing function and driving circuit thereof |
| CN102006419B (en) * | 2010-09-17 | 2013-01-02 | 惠州Tcl移动通信有限公司 | Mobile terminal with automatic focusing driving circuit and driving circuit thereof |
-
2010
- 2010-09-17 CN CN201010285292XA patent/CN102006419B/en not_active Expired - Fee Related
-
2011
- 2011-07-05 WO PCT/CN2011/076844 patent/WO2012034443A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| WO2012034443A1 (en) | 2012-03-22 |
| CN102006419A (en) | 2011-04-06 |
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