CN101064779A - Method for realizing minisize camera automatic focusing and minisize camera thereof - Google Patents
Method for realizing minisize camera automatic focusing and minisize camera thereof Download PDFInfo
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- CN101064779A CN101064779A CN 200610076643 CN200610076643A CN101064779A CN 101064779 A CN101064779 A CN 101064779A CN 200610076643 CN200610076643 CN 200610076643 CN 200610076643 A CN200610076643 A CN 200610076643A CN 101064779 A CN101064779 A CN 101064779A
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Abstract
A method to realize auto focusing of micro camera and a micro camera are disclosed, and the camera includes enclosure, lens mounted before the enclosure, sensor which includes imaging sensitimeter and phase detecting unit mounted in the enclosure, controller which is used to calculate the adjusting distance and direction according to the detecting signal from sensor, the focusing buffer pool which can align the sensitizing surface and focusing surface of sensor automatically, the focusing buffer pool is location adjusting mechanism driven by electromagnetism, the movable end is connected with sensor, and the other end is mounted on the rear of enclosure, when it receives the control signal for adjusting location and direction output by controller, and drives the movable end to move, and drives the sensitizing surface move to the location of focusing surface of sensor. The invention driven by electromagnetism reduces the difficulty of phone structure and manufacturing technique, and reduces the manufacturing cost, which benefits for the promotion and popularity of photograph camera with auto focusing function.
Description
Technical field
The present invention relates to a kind of method and device of minisize pick-up head focusing, this invention is applicable to various minisize pick-up heads, comprises the minisize pick-up head that mobile phone adopts.
Background technology
No matter how complicated structure is for camera lens, in fact can be regarded as a slice convex lens, we can see from basic optical principle, the light that comes of direction whatsoever beyond the convex lens axle center, after passing through convex lens, the capital is refracted, and be intersected in a bit, the plotted point of these light is called as focus, usually have a few the plane of forming on can the blur-free imaging position and be called the focal plane, be in the object of focal plane for those, camera can both be filmed clearly, and front and back, out of focus plane scenery far away more, image is just fuzzy more.For from the far and near different object of camera lens, by will just focusing at fixing position blur-free imaging behind the camera lens.Directly perceived after camera lens is brought into focus, subject will be clear especially.The focusing mode of camera overwhelming majority camera lens all is the distance that calculates earlier between the film face of film camera or the transducer of digital camera head (CCD or CMOS) photosurface and the eyeglass, realizes focusing by the position of regulating eyeglass then.If the camera transducer will be realized automatic focusing, main by installation and control device in camera and micro-step motor realization focusing automatically, but being applied in minisize pick-up head, this mode particularly on the mobile phone minisize pick-up head, has inconvenience:
Owing to technology and structural reason, the lens position relative fixed of mobile phone cam, and traditional approach is to realize focusing automatically by mobile lens position.If adopt this mode to realize that the automatic focusing of mobile phone cam can increase the complexity of mobile phone technology and structure undoubtedly, and then cause cost to rise;
The tradition Focusing mechanism of focusing mode automatically generally adopts micro-step motor, and cost is higher.If be applied on the shooting mobile phone minisize pick-up head, directly cause the mobile phone cost higher, limited its application on camera mobile phone cam.This also is the shooting mobile phone cause of less types that has automatic focusing function in the market, so that can't satisfy mass consumption person to having the demand of automatic focusing shooting mobile phone.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of minisize pick-up head method of focusing automatically that realizes, can realize the automatic focusing of minisize pick-up head at an easy rate.
In order to solve the problems of the technologies described above, the invention provides a kind of minisize pick-up head method of focusing automatically that realizes, may further comprise the steps:
(a) light reaches the sensor photosensitive face by camera lens, and sensor goes out focus when inaccurate, and output " focusing checking " signal is to controller;
(b) described controller calculates direction and distance that minisize pick-up head sensor photosensitive face need move according to " focusing checking " signal, and the focal adjustment mechanism transmission focusing control signal to Electromagnetic Drive comprises described direction and range information;
(c) after the focusing control signal was received by described focal adjustment mechanism, the size of regulating the drive current of output made the sensor photosensitive face move to position when front focal plane.
Further, said method also can have following characteristics: described " focusing checking " signal is an analog signal, before the signal of will " focusing and verify " is input to described controller, is converted into digital quantity signal earlier.
Further, said method also can have following characteristics: " focusing checking " signal after described controller receives digitlization, focal length, lens speed according to used camera lens calculate direction and the distance that minisize pick-up head sensor photosensitive face needs move, as described focusing control signal.
Further, said method also can have following characteristics: described focal adjustment mechanism is according to described focusing control signal, regulate the size of current and/or the direction of solenoid, change and itself and magnetic between the size and/or the direction of active force, and then the stretching of the fixing spring of control two ends and described solenoid and magnet relative position, make the photosurface of the transducer that is installed in the spring movable end move to position when front focal plane.
Further, said method also can have following characteristics: described " focusing checking " signal comprises that phase detection device measures defocuses direction and defocus amount information.
Further, said method also can have following characteristics: described focusing control signal is the resistance sizes as digital regulation resistance in the control signal control circuit driven by electromagnetic means, thereby changes the size of current of solenoid; And/or, thereby the sense of current of change solenoid next with the change polarity of voltage by the control figure switch.
The technical problem to be solved in the present invention provides a kind of minisize pick-up head, can focus automatically and with low cost.
In order to solve the problems of the technologies described above, the invention provides a kind of minisize pick-up head, comprise shell, be installed in the camera lens of shell front end, the transducer that comprises imaging photoreceptor and phase detection unit in the enclosure is installed, adjust the controller of distance and direction and the focal adjustment mechanism of automatic alignment sensor photosurface and focal plane according to the sensor calculated signals, be characterized in: described focal adjustment mechanism is the position adjusting mechanism of an Electromagnetic Drive, its movable end is connected with described transducer, the other end is fixed on the rear end of described shell, after the control signal of adjustment position that receives described controller output and direction, drive its movable end and move, drive the position that described sensor photosensitive face moves to the focal plane.
Further, above-mentioned minisize pick-up head also can have following characteristics: described focal adjustment mechanism comprises that movable base plate, circuit driven by electromagnetic means, magnet, solenoid, flexible member, guide rail and base constitute, wherein:
Described base is fixed on described shell 10 rear ends;
Described guide rail is fixed on the both sides of shell rear inner surface, and a bottom seat links to each other;
Described magnet is fixed on the base;
The both sides shape of described movable base plate and described guide rail shape are complementary, and can move along this guide rail;
Described solenoid is fixed on the described substrate;
Described flexible member, an end is fixed on the substrate, and the other end is fixed on the base;
The output of described circuit driven by electromagnetic means is connected with described electromagnetic wire coil;
Described transducer is fixed on the described substrate, size and/or direction that described circuit driven by electromagnetic means is regulated its output current according to the control signal of described controller output, influence the active force between solenoid and the magnet, and then the length of change flexible member, the sensor photosensitive face on the movable base plate is adjusted on the focal plane;
Further, above-mentioned minisize pick-up head also can have following characteristics: described movable base plate is a printed substrate, includes described controller and circuit driven by electromagnetic means above.
Further, above-mentioned minisize pick-up head also can have following characteristics: described focal adjustment mechanism also comprises baffle plate, and this baffle plate is fixed on outer casing inner wall, and the distance between itself and camera lens equals the focal length of camera lens, and described guide rail is installed between this baffle plate and the described base.
As from the foregoing, the existing relatively at present focusing automatically of the present invention micro-lens has following advantage:
1, Focusing mechanism changes Electromagnetic Drive into by step motor drive, makes that focusing micro-lens cost greatly reduces automatically, and its structural design and manufacturing technique requirent also decreased more in the past.
2, for needing the fixing minisize pick-up head applied environment of camera lens, particularly in the application of shooting mobile phone, do not change the relative position of camera lens during this micro-lens focusing, reduced difficulty on shooting mobile phone structural design and the production technology, and then reduce the mobile phone production cost, help having the popularizing of shooting mobile phone of automatic focus function.
In a word, by the present invention can effectively promote to focus the automatically application and the popularization of micro-lens, particularly in the application and popularization of shooting mobile phone, the minisize pick-up head manufacturer who makes, shooting mobile phone developer, shooting mobile phone consumer three parts are benefited, and promote the economic development of society.
Description of drawings
Fig. 1 is focus the automatically cut-away view of minisize pick-up head of present embodiment;
Fig. 2 is the flow chart of present embodiment minisize pick-up head auto-focus process;
Fig. 3 is the schematic diagram that the present embodiment minisize pick-up head is focused automatically and controlled.
Embodiment
Present embodiment is focused the minisize pick-up head internal structure as shown in Figure 1 automatically, is divided into as the lower part:
Camera lens 1: can form by a monolithic or a set of contact lenses.Camera lens is fixed-site in minisize pick-up head, and remains unchanged with the distance of base, the application scenario that the minisize pick-up head camera lens of satisfying the demand is fixing.
Baffle plate 2: baffle plate is fixed on the shell, and baffle position equals the focal length of camera lens apart from the length of camera lens, in case the sensor photosensitive face moves in the lens focus.
Transducer 3: comprise imaging photoreceptor and phase detection unit.Wherein imaging photoreceptor can be ccd sensor or cmos sensor; Transducer is fixed on the pcb board (printed circuit board (PCB)), moves with pcb board.
Pcb board 4: minisize pick-up head internal circuit board, comprise a controller and circuit driven by electromagnetic means, controller hardware can adopt 4/8 general micro-control unit (MCU, microprocessor controlunit) is platform, controller goes out distance and the direction that the sensor photosensitive face should be adjusted according to " focusing checking " calculated signals of transducer output, the output corresponding control signal is to circuit driven by electromagnetic means, and circuit driven by electromagnetic means is regulated the size of current and the direction of solenoid according to this control signal.This circuit board can move along guide rail, to adjust to focal plane position.
Permanent magnet 5:, decide according to the sense of current of solenoid for the N utmost point or S utmost point permanent magnet.Permanent magnet is fixed on the base.
Solenoid 6: solenoid is to produce the polarity opposite with permanent magnet in energising, produces the power that attracts each other with permanent magnet; Solenoid is fixed on the pcb board.
Spring 7: when solenoid is switched on, the power of attracting each other that solenoid and permanent magnet produce will be made a kind of minisize pick-up head method of focusing automatically that realizes,
Guide rail 8: guide rail, be used for guaranteeing the level and smooth, stable of pcb board motion process, prevent the shake of pcb board and transducer, to guarantee image quality; Guide rail is fixed on the shell, and two ends link to each other with base with baffle plate respectively, and its surface configuration should be complementary with the shape of PCB circuit board both sides, cooperates with projection as adopting groove, and roller track cooperates or the like.
Base 9: be the minisize pick-up head base, play the effect of stablizing minisize pick-up head.
Shell 10: be the minisize pick-up head shell, protection minisize pick-up head internal part.
From system's cybernetics angle, this autofocus system is a closed-loop control system.As shown in Figure 3, transducer is as the sensing unit of control system, controller on the pcb board is as the control unit of this focusing control system, and circuit driven by electromagnetic means, permanent magnet, solenoid, spring, guide rail and base on the pcb board, pcb board have constituted the focal adjustment mechanism of Electromagnetic Drive, and wherein pcb board is the movable end of this mechanism.But the concrete structure of the position adjusting mechanism of this Electromagnetic Drive is not limited to embodiment, also other form can be arranged.Also can fixedly mount in the enclosure such as the pcb board that has controller and circuit driven by electromagnetic means, serve as the movable base plate of this focal adjustment mechanism with common plate, circuit driven by electromagnetic means links to each other with solenoid with long lead.In addition, not necessarily use permanent magnet, also can replace with the metal that has twined another solenoid.
The flow process of present embodiment minisize pick-up head auto-focus process may further comprise the steps as shown in Figure 2:
Step 110, light reaches the sensor photosensitive face by camera lens, and whether detect focus by phase detection device wherein accurate, if accurately, focusing finishes, otherwise, provide to have " focusing checking " signal that defocuses direction and defocus amount information;
Phase detection device can be TCL (Through the Camera Lens) phase-detection assembly or TTL (Through The Lens) phase-detection assembly commonly used.Unpunctual when focus, phase detection device is measured and is defocused (being off-focal) direction and defocus amount, the signal of promptly " focusing and verify ", and " focusing checking " signal is an analog signal.
Step 120 is sent into " focusing checking " signal A/D conversion circuit and is converted to digital signal, sends into the controller in the minisize pick-up head then;
Step 130, controller in the minisize pick-up head receives " focusing checking " signal after the digitlization, calculate direction and the distance that minisize pick-up head sensor photosensitive face needs move according to the focal length of used camera lens, lens speed etc., can adopt existing various algorithm, to focal adjustment mechanism output focusing control signal;
Step 140, after the focusing control signal is received by focal adjustment mechanism, the conditioning signal of the sense of current of solenoid and size of current in circuit driven by electromagnetic means is converted to minisize pick-up head, control the power that attracts each other of itself and the permanent magnet S/N utmost point, and then control minisize pick-up head inner spring is flexible, makes the sensor photosensitive face move to position when front focal plane;
The focusing control signal is a digital signal, this signal can be used as the resistance sizes of digital regulation resistance in the control signal control circuit driven by electromagnetic means, thereby change the size of current of solenoid, and the control figure switch to be changing polarity of voltage, thereby can to change the sense of current of solenoid.This drive circuit is very common, repeats no more here.
If the focal plane is between spring balancing position (i.e. the position that spring is not promptly stretched and do not compress yet) and camera lens, identical polar can be produced so that both repel each other with extension spring by regulating the sense of current, otherwise then should produce opposite polarity with the compression spring, by regulating the size of electric current, can control the displacement of transducer.Certainly also the stroke range inner spring of possibility pcb board all is in compressive state, just need not change size of current.
When regulating the sensor photosensitive face, whether phase detecting module detects focus continuously accurate, if focus is inaccurate, proceeds to regulate.If focus is accurate, this moment, focal plane and sensor photosensitive face overlapped, thereby realized the automatic focusing of minisize pick-up head, promptly realized " focus is accurate ", and the minisize pick-up head auto-focus process finishes.
From system's cybernetics angle, this autofocus system is a closed-loop control system.The advantage of closed-loop control system is not have error between input variable and the desired output amount.The precision of whole system is mainly decided by the precision of focus detection device (phase detecting module).If cause the focal adjustment mechanism precision to descend because of component ageing, mechanical wear, closed-loop system will automatically compensate, and can not cause excessive influence to the autofocus system overall performance.
In sum, tradition automatically focusing minisize pick-up head lens location is adjustable, and the miniature of the present invention taken the photograph Picture head lens location when focusing is relatively fixing, and adjustable is the relative position of minisize pick-up head sensor. , Poor by the phase detection device detected phase, size of current and the direction of control solenoid are regulated electromagnetism The power that attracts each other of coil and magnet, and then the relative position of change minisize pick-up head sensor are finished little The automatic focusing of type camera. Therefore the present invention relatively at present existing automatically focusing micro-lens have as Lower advantage:
1, Focusing mechanism changes solenoid into by stepper motor, so that the micro-lens cost of automatically focusing is big For reducing, its structural design and manufacturing technique requirent also decreased more in the past.
2, for needing the fixing minisize pick-up head applied environment of camera lens, particularly at shooting mobile phone should Use, do not change the relative position of camera lens during this micro-lens focusing, reduced the shooting mobile phone structural design With difficulty on the production technology, and then reduce the mobile phone production cost, be conducive to have the bat of automatic focusing function According to popularizing of mobile phone.
In a word, by the present invention can effectively promote automatically to focus application and the popularization of micro-lens, special On the application of shooting mobile phone and promoting, the minisize pick-up head manufacturer who makes, shooting mobile phone developer, The shooting mobile phone consumer is tripartite to be benefited, and promotes the economic development of society.
Claims (10)
1, a kind of minisize pick-up head, comprise shell, be installed in the camera lens of shell front end, in the enclosure the transducer that comprises imaging photoreceptor and phase detection unit is installed, is adjusted the controller of distance and direction and the focal adjustment mechanism of alignment sensor photosurface and focal plane automatically, it is characterized in that according to the sensor calculated signals:
Described focal adjustment mechanism is the position adjusting mechanism of an Electromagnetic Drive, its movable end is connected with described transducer, the other end is fixed on the rear end of described shell, after the control signal of adjustment position that receives described controller output and direction, drive its movable end and move, drive the position that described sensor photosensitive face moves to the focal plane.
2, minisize pick-up head as claimed in claim 1 is characterized in that, described focal adjustment mechanism comprises that movable base plate, circuit driven by electromagnetic means, magnet, solenoid, flexible member, guide rail and base constitute, wherein:
Described base is fixed on described shell 10 rear ends;
Described guide rail is fixed on the both sides of shell rear inner surface, and a bottom seat links to each other;
Described magnet is fixed on the base;
The both sides shape of described movable base plate and described guide rail shape are complementary, and can move along this guide rail;
Described solenoid is fixed on the described substrate;
Described flexible member, an end is fixed on the substrate, and the other end is fixed on the base;
The output of described circuit driven by electromagnetic means is connected with described electromagnetic wire coil;
Described transducer is fixed on the described substrate, size and/or direction that described circuit driven by electromagnetic means is regulated its output current according to the control signal of described controller output, influence the active force between solenoid and the magnet, and then the length of change flexible member, the sensor photosensitive face on the movable base plate is adjusted on the focal plane.
3, minisize pick-up head as claimed in claim 2 is characterized in that, described movable base plate is a printed substrate, includes described controller and circuit driven by electromagnetic means above.
4, minisize pick-up head as claimed in claim 2 is characterized in that, described focal adjustment mechanism also comprises baffle plate, and this baffle plate is fixed on outer casing inner wall, and the distance between itself and camera lens equals the focal length of camera lens, and described guide rail is installed between this baffle plate and the described base.
5, a kind of minisize pick-up head method of focusing automatically that realizes may further comprise the steps:
(a) light reaches the sensor photosensitive face by camera lens, and sensor goes out focus when inaccurate, and output " focusing checking " signal is to controller;
(b) described controller calculates direction and distance that minisize pick-up head sensor photosensitive face need move according to " focusing checking " signal, and the focal adjustment mechanism transmission focusing control signal to Electromagnetic Drive comprises described direction and range information;
(c) after the focusing control signal was received by described focal adjustment mechanism, the size of regulating the drive current of output made the sensor photosensitive face move to position when front focal plane.
6, method as claimed in claim 5 is characterized in that: described " focusing checking " signal is an analog signal, before the signal of will " focusing and verify " is input to described controller, is converted into digital quantity signal earlier.
7, method as claimed in claim 6, it is characterized in that, " focusing checking " signal after described controller receives digitlization calculates direction and the distance that minisize pick-up head sensor photosensitive face needs move according to focal length, the lens speed of used camera lens, as described focusing control signal.
8, method as claimed in claim 5, it is characterized in that, described focal adjustment mechanism is according to described focusing control signal, regulate the size of current and/or the direction of solenoid, change and itself and magnetic between the size and/or the direction of active force, and then the stretching of the fixing spring of control two ends and described solenoid and magnet relative position, make the photosurface of the transducer that is installed in the spring movable end move to position when front focal plane.
9, method as claimed in claim 5 is characterized in that, described " focusing checking ", and signal comprises that phase detection device measures defocuses direction and defocus amount information.
10, method as claimed in claim 8 is characterized in that, described focusing control signal is the resistance sizes as digital regulation resistance in the control signal control circuit driven by electromagnetic means, thereby changes the size of current of solenoid; And/or, thereby the sense of current of change solenoid next with the change polarity of voltage by the control figure switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610076643XA CN100556080C (en) | 2006-04-27 | 2006-04-27 | A kind of minisize pick-up head method and minisize pick-up head thereof of focusing automatically realized |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610076643XA CN100556080C (en) | 2006-04-27 | 2006-04-27 | A kind of minisize pick-up head method and minisize pick-up head thereof of focusing automatically realized |
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| CN101064779A true CN101064779A (en) | 2007-10-31 |
| CN100556080C CN100556080C (en) | 2009-10-28 |
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