CN1975555A - Focusing device, optical imaging system with the same fo cusing device and focusing method - Google Patents
Focusing device, optical imaging system with the same fo cusing device and focusing method Download PDFInfo
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- CN1975555A CN1975555A CN 200510124070 CN200510124070A CN1975555A CN 1975555 A CN1975555 A CN 1975555A CN 200510124070 CN200510124070 CN 200510124070 CN 200510124070 A CN200510124070 A CN 200510124070A CN 1975555 A CN1975555 A CN 1975555A
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Abstract
The invention relates to a kind of focus device which is applied to optical imagery system. The optical imagery system includes: One zoom lens group, one image fetching module, and one base board. The zoom lens group can provide the optics zoom function which is changed to imaging enlarging multiplying power, and may make one external imaging image in the image fetching module, and transmitting the external imaging to the base board after changing it to the electricity signal. The focus control device includes: One body, one arrester and one electricity signal transmission device. Arrester combines with the image fetching module, may drive the image fetching module to take the displacement motion relative to the lens group and base board. The electricity signal transmission between the arrester and base board, it can transmit the electricity signal when the image fetching module displace. The focus device can correlates to image fetching module to maintain imaging articulation when the zoom lens group is zooming.
Description
Technical field
The present invention relates to a kind of focus control, relate in particular to a kind of being applicable in the optical imaging system, and can drive image acquisition module and carry out displacement to reach the focus control of focusing function.
Background technology
Along with science and technology flourishing with the powerful demand of consumer under, information products miscellaneous and equipment in response to and give birth to, and digital camera promptly is wherein important invention.Digital camera add the prosperity of modern electronic product, so this product all moves towards all short and small frivolous target owing to need regular carrying.
The camera lens part of digital camera is one of key component that influences the digital camera pickup quality always.And the adjustment action when making a video recording for digital camera, except adjusting lens aperture size or the shutter speed in response to the variation of external light power, also normal because of the change of imaging enlargement ratio or the fine setting of imaging definition, and need carry out the switching or the trimming movement of lens location, with zoom function or the focusing function that the digital camera camera lens is provided.
See also shown in Figure 1ly, it is for having the synoptic diagram of commonly using optical imaging system of zoom function in the general digital camera now.Have the optical imaging system of commonly using of zoom function for tradition, it is made of a substrate 13 that comprises a zoom lens group 11, an image acquisition module 12 and be provided with some control circuits 131.This zoom lens group 11 can image in an extraneous image 14 on the image acquisition module 12, and transfer on the substrate 13 after should external world's image 14 converting electrical signal to by this image acquisition module 12, and by be positioned on the substrate 13 control circuit 131 for example microprocessor etc. handle.This zoom lens group 11 in general, be by comprise a motionless lens combination 111, a movable lens set 112, and institute such as a lens driver 113 constitute.Lens driver 113 is to be electrically connected on the substrate 13 and controlled by the control circuit 131 on it.Driving movable lens set 112 by lens driver 113 carries out with respect to the displacement movement (as the distance D of Fig. 1 shown in) of motionless lens combination 111 with image acquisition module 12, to reach the purpose that changes different imaging enlargement ratios.
For the optical imaging system of commonly using as shown in Figure 1, because image acquisition module 12 generally is directly to be combined on the substrate 13 with control circuit 131, so be generally a motionless assembly.And the zoom function that optical imaging system provided then is dependent on zoom lens group 11 fully and is finished by one's own efforts.Yet, when carrying out zoom, carry out relatively large amplitude (shown in the distance D of Fig. 1) displacement except movable lens set 112 and can reach the function that changes different imaging enlargement ratios, relative, often therefore cause the reduction of imaging definition also, and need carry out the work of microspur focusing.In located by prior art, for the cheap optical imaging system of lower-order, normally the mode of just sacrificing imaging definition with allowable error is handled.And for the optical imaging system of high-order, then need use have the accurate lens combination 111,112 of optical design, and collocation can carry out the lens driver 113 and control circuit 131 that microspur is accurately adjusted the position, make this zoom lens group 11 can finish the zoom of significantly displacement and two kinds of functions of focusing that microspur is adjusted by one's own efforts.Yet this measure significantly improves the cost of the optical imaging system that makes.
Summary of the invention
First purpose of the present invention is to provide a kind of focus control that is applicable to optical imaging system, and it can reach the function of focusing by the mode of microspur movable image acquisition module.
Second purpose of the present invention, be to provide a kind of optical imaging system with focus control with and focus adjustment method.In this optical imaging system, this focus control zoom lens group of can arranging in pairs or groups is used.Change the zoom function of different imaging enlargement ratios by this zoom lens group, and the mode of the microspur movable image acquisition module of arranging in pairs or groups simultaneously reaches the function of focusing.Therefore can reach the effect that only need use more cheap zoom lens group that good imaging definition just can be provided.
This focus adjustment method of the present invention has the following step:
One focus control is provided, is incorporated on the image acquisition module, this focus control can drive image acquisition module and carry out limited displacement movement with respect to zoom lens group;
Use this zoom lens group to carry out the optical zoom function of switching imaging enlargement ratio; And,
Drive this focus control, be maintained in image sharpness with the position of corresponding fine tuning video acquisition module when zoom lens group is carried out zoom.
The 3rd purpose of the present invention is to provide a kind of focus control that is applicable to optical imaging system, and this focus control has a clamping device that is incorporated on the image acquisition module, carries out limited displacement for driving image acquisition module.This clamping device is the electro-magnetic braking device of a unique design, and it includes at least one permanent magnet that is incorporated on this image acquisition module, at least one magnetic conductor that is wound with several coils and a guide mechanism.This magnetic conductor is corresponding to the magnetic pole of permanent magnet, and can move by electric current being applied to drive permanent magnet on the coil and then drive image acquisition module.Simultaneously, this guide mechanism then can limit image acquisition module and only can carry out linear displacement motion and can not rotate motion.
The 4th purpose of the present invention is to provide a kind of focus control that is applicable to optical imaging system, and this focus control has the electrical signal transmitting device of a uniqueness for the electrical signal transmission of carrying out between this mobile image acquisition module and the substrate.This electrical signal transmitting device includes a flexible circuit board, and this image acquisition module combination also is electrically connected on this flexible circuit board.This flexible circuit board is a polygonized structure, and a cutting groove that is provided with that an at least one edge along flexible circuit board parallels and extends at a distance of the direction of a preset width.One end of this cutting groove extends to the flexible circuit board outer rim other end and does not then extend to another outer rim, and makes the flexible circuit board between this cutting groove and edge constitute a cantilever-shaped flexible winding displacement of swinging in fact.This flexible winding displacement has a stiff end that links to each other with flexible circuit board and a free end that can freely swing, and this stiff end is electrically connected at image acquisition module, and this free end in conjunction with and be electrically connected at this substrate.By this, even when image acquisition module carries out displacement, this cantilever-shaped flexible winding displacement of swinging still can maintenance and the electric connection state of image acquisition module and substrate.
In order to achieve the above object, the present invention provides a kind of focus control that is applicable to optical imaging system.This optical imaging system includes: a zoom lens group, an image acquisition module and a substrate.This zoom lens group can provide the optical zoom function of switching imaging enlargement ratio, and can be with an extraneous video imaging on image acquisition module, and transfers on the substrate after should external world's video conversion becoming electrical signal by this image acquisition module.This focus control includes: a body, a clamping device and an electrical signal transmitting device.Clamping device is incorporated into this image acquisition module, can drive image acquisition module and carry out with respect to lens group and both displacement movements of substrate.The electrical signal transmitting device is got in touch with between clamping device and substrate, can be when image acquisition module carries out displacement still and the transmission of the electrical signal between the substrate.By this, this focus control can be when zoom lens group be carried out zoom the position of corresponding fine tuning video acquisition module to be maintained in image sharpness.
Description of drawings
Fig. 1 is a synoptic diagram of commonly using the optical imaging system with zoom function;
Fig. 2 A is first diagrammatic cross-section (nothing is cutd open guide rod) that focus control of the present invention is arranged on first preferred embodiment in the optical imaging system;
Fig. 2 B is second diagrammatic cross-section (cuing open guide rod) that focus control of the present invention is arranged on first preferred embodiment in the optical imaging system;
Fig. 3 is arranged on the front-view schematic diagram of first preferred embodiment in the optical imaging system for focus control of the present invention;
Fig. 4 is the board top view in the focus control of the present invention;
Fig. 5 is the rotating disk top view in the focus control of the present invention;
Fig. 6 A is the top view of a preferred embodiment of the flexible circuit board in the focus control of the present invention;
Fig. 6 B is the three-dimensional view of a preferred embodiment of the flexible circuit board in the focus control of the present invention;
Fig. 7 is for reaching a preferred embodiment synoptic diagram of electrical signal transmitting device with the wireless signal transmission mode in the focus control of the present invention;
Fig. 8 is a preferred embodiment process flow diagram of focus adjustment method of the present invention.
Description of reference numerals: 11 zoom lens group; 111 motionless lens combination; 112 movable lens set; 113 lens drivers; 12 image acquisition modules; 13 substrates; 131 control circuits; 14 extraneous images; 21 lens group; 212 movable lens set; 213 lens drivers; 22 image acquisition modules; 23 substrates; 231 control circuits; 24 extraneous images; 30 focus controls; 31 bodies; 311 sleeve parts; 40 clamping device; 41 first permanent magnets; 411 first polarity; 412 second polarity; 42 second permanent magnets; 43 first magnetic conductors; 431,441 coils; 432,442 first extensions; 433,443 second extensions; 44 second magnetic conductors; 45 guide mechanisms; 451 oblique guide grooves; 452 boards; 4521 saturating emptying apertures; 4522 guide holes; 4523 salient points; 453 rotating disks; 4531 clamping parts; 4532 projection arms; 4533 jaws; 454 guide rods; 46 flexible circuit boards; 461 flexible winding displacements; 4611 stiff ends; 4612 free ends; 4613 circuit layouts; 462 edges; 463 cutting grooves; 51 wireless signal transmitter and wireless receiver; 52 wireless signal receivers; 53 power leads; The 61-63 process step.
Embodiment
In order more clearly to describe the focus control that is applicable to optical imaging system proposed by the invention, below describe conjunction with figs. in detail it.
See also Fig. 2 A, Fig. 2 B and shown in Figure 3, it is respectively first section, second section, and front elevational schematic that the present invention is applicable to focus control first preferred embodiment of optical imaging system.Optical imaging system of the present invention includes at least: a lens group 21, an image acquisition module 22 and a substrate 23.This lens group 21 can image in extraneous image 24 gatherings on the image acquisition module 22, and transfer on the substrate 23 after should external world's image 24 converting electrical signal to by this image acquisition module 22, and do further processing by some control circuits 231 (for example microprocessor etc.) of being located on the substrate 23.
Optical imaging system of the present invention can be applicable on the digital camera module (for example digital camera or have mobile phone, computing machine or personal digital assistant of digital camera module or the like).And in this preferred embodiment, this lens group 21 is a zoom lens group 21.This zoom lens group 21 is provided with an at least one movable lens set 212 and a lens driver 213.Lens driver 213 is electrically connected on the substrate 23 and controlled by the control circuit 231 on it.Drive the displacement movement (shown in the distance D of Fig. 2 A) that movable lens set 212 is carried out relatively large preset distance by lens driver 213, to reach the function that changes different imaging enlargement ratios, for example, provide the optical zoom function that switches at least one first enlargement ratio and one second enlargement ratio.As for, in this preferred embodiment, 22 of this image acquisition modules can be for example light lotus coupling assembly (the Charge Coupled Device that can buy on the market at present; Be called for short CCD) or CMOS video sensing assembly (CMOS Image Sensor) etc.Because above-described image acquisition module 22, zoom lens group 21 and lens driver 213, all can be by selecting for use in the present known techniques and non-ly be technical characterictic of the present invention, so below will repeat no more its detailed formation.
As Fig. 2 A, Fig. 2 B and shown in Figure 3, the focus control 30 of optical imaging system that is applicable to of the present invention includes: a body 31, a clamping device 40, an and electrical signal transmitting device.This body 31 is in order to holding this lens group 21, image acquisition module 22 and substrate 23, and makes image acquisition module 22 can carry out limited displacement movement in body 31.This clamping device 40 is incorporated into this image acquisition module 22, can drive image acquisition module 22 and carry out with respect to both displacement movements of lens group 21 and substrate 23.As for, this electrical signal transmitting device is then got in touch with between clamping device 40 and substrate 23, can still can keep the state of electrical signal transmission between the two when image acquisition module 22 carries out displacement movement with respect to substrate 23.
In this preferred embodiment, this clamping device 40 includes: at least one permanent magnet (for example first permanent magnet 41 shown in Fig. 2 A and second permanent magnet 42), at least one magnetic conductor (first magnetic conductor 43 for example shown in Figure 3 and second magnetic conductor 44) and a guide mechanism 45.Each permanent magnet 41,42 all is incorporated into this image acquisition module 22 indirectly, and each permanent magnet 41,42 2 end respectively has one first relative polarity and one second polarity respectively.In Fig. 3, first permanent magnet 41, first polarity 411 be that the S utmost point and second polarity 412 are the N utmost point.And second permanent magnet 42 be can't see owing to being covered by first permanent magnet 41 in Fig. 3, but, in this preferred embodiment, first polarity of second permanent magnet 42 is similarly in Fig. 3 right side and is the S utmost point equally, and second polarity in second permanent magnet, 42 left sides is the N utmost point equally.Simultaneously, each magnetic conductor 43,44 all is provided with and is wound with respectively several coils 431,441 around sleeve part 311 peripheries of body 31.In addition, the two ends of each magnetic conductor 43,44 also all respectively have respectively away from one first extension 432,442 of substrate 23 and than one second extension 433,443 near substrate 23.In this preferred embodiment as shown in Figure 3, first extension, 432 positions of this first magnetic conductor 43 are corresponding with first polarity 411 of this first permanent magnet 41, simultaneously, second extension, 443 positions of second magnetic conductor 44 are corresponding with second polarity 412 of first permanent magnet 41.In like manner, for the position in first permanent magnet 41 sides and second extension, 433 positions of invisible these second permanent magnet, 42, the first magnetic conductors 43 will can be corresponding to second polarity (the N utmost point) of second permanent magnet 42 corresponding to first extension, 442 positions of first polarity (the S utmost point) of second permanent magnet 42 and second magnetic conductor 44 in Fig. 3 relatively in addition.When the coil on the magnetic conductor 43,44 431,441 is applied the electric current of predetermined voltage, the magnetic line of force that coil 431,441 is produced will be by guiding that magnetic conductor 43,44 is responded to, and be concentrated to the extension place at two ends, and then permanent magnet 41,42 is produced the thrust of drawing that there is a natural attraction between the sexes or the same sex is repelled each other.
This guide mechanism 45 be arranged on the body 31 and interlock in image acquisition module 22.This guide mechanism 45 can limit image acquisition module 22 only can carry out the linear displacement motion and can not rotate motion.In this preferred embodiment, this body 31 includes this sleeve part 311 of hollow cylindrical, and this guide mechanism 45 includes: at least one oblique guide groove 451, a board 452, a rotating disk 453 and at least one guide rod 454.
As shown in Figure 3, this at least one oblique guide groove 451 (for example the first oblique guide groove 451 be represented by dotted lines the unnumbered second oblique guide groove) is arranged on the outer peripheral edges of this sleeve part 311 of body 31 and corresponds respectively to the position of those permanent magnets 41,42, make each permanent magnet 41,42 can be subjected to the restriction and the guiding of guide groove 451 respectively, and carry out oblique linear movement along the bearing of trend of guide groove 451.
As Fig. 2 A and shown in Figure 4, this board 452 is placed in these sleeve part 31 inside of body 30, and it is to be used for carrying and to locate this image acquisition module 22.On board 452 and be provided with: a saturating emptying aperture 4521, at least one guide hole 4522, and at least one salient point 4523.The size of this saturating emptying aperture 4521 is roughly corresponding to image acquisition module 22, makes when image acquisition module 22 is positioned on the board 452, and image acquisition module 22 is unlikely by board 452 towards the side surface of lens group 21 and covers.Function as for this guide hole 4522 and salient point 4523 then illustrates it with other after a while.
As Fig. 2 A and shown in Figure 5, this rotating disk 453 is placed in these sleeve part 31 inside of body 30, and this rotating disk 453 is to be a hollow ring member and more to be provided with to comprise at least one clamping part 4531, at least one projection arm 4532 and at least one jaw 4533 substantially.This clamping part 4531 is to come clamping and support this board 452 in the mode of rotation-sliding mutually.For example in this preferred embodiment, it can hold an edge of board 452 to this clamping part 4531 in order to have a U-shaped opening, and the U-shaped aperture pitch of this clamping part 4531 is greater than board 452 edge thickness, makes board 452 present the lax and state of rotation-sliding relatively in the U-shaped opening.And those are arranged on the salient point 4523 at board 452 edges, and its position just is positioned at the U-shaped opening of clamping part 4531, its can reduce and clamping part 4531 between friction force.These projection arm 4532 autorotation disks 453 outer rims are passed guide groove 451 and are stretched out outside the sleeve part 31.4533 of jaws are arranged at projection arm 4532 ends and present a C shape structure substantially for being used for clamping and this permanent magnet 41,42 of location.
Shown in Fig. 2 B, this at least one guide rod 454 is arranged at body 30 inside and extends a predetermined length towards board 452.The position of this set at least one guide hole 4522 just corresponds respectively to the position of this at least one guide rod 454 on the board 42, and makes guide rod 454 pass this guide hole 4522.Thus, this board 452 (and be positioned on the board 452 image acquisition module 22) will be subjected to the restriction of guide rod 454, and only can carry out along the linear displacement of this guide rod 454 moving, and can't rotate fully.
By aforesaid preferred embodiment of the present invention as can be known, by applying the electric current of predetermined direction to being wrapped in coil 431,441 on the magnetic conductor 43,44, can impel permanent magnet 41,42 along guide groove 451 oblique movements (for example moving) towards the upper right side of Fig. 3, and drive rotating disk 453 carries out similar thread rotation in sleeve part 311 displacement movement, and then impel board 452 and image acquisition module 22 to carry out moving along the linear displacement of guide rod 454 directions.So and of the present inventionly adopt this kind will convert to along the swing offset of oblique guide groove 451 similar threads to move along the linear displacement of guide rod 454 directions, mainly be to drive more short-range image acquisition module 22 displacements by the motion of the permanent magnet 41,42 of longer stroke, so can impel image acquisition module 22 to carry out accurate distance fine regulation work, and reach the purpose of focusing smoothly.So, focus control 30 of the present invention is worked as the known zoom lens group 21 of carrying out relatively large lens displacement motion of can arranging in pairs or groups easily and is used, and utilize zoom lens group 21 to change the function of different imaging enlargement ratios, and use focus control 30 of the present invention to come microspur movable image acquisition module 22, overcome the shortcoming of located by prior art fully to reach the focal length fine adjustment function and to be maintained in image sharpness.
See also Fig. 6 A and Fig. 6 B, be respectively the top view and the three-dimensional view of a preferred embodiment of the flexible circuit board in the focus control of the present invention.And because image acquisition module 22 of the present invention is not motionless assembly, so can't as located by prior art, directly be fixed on the substrate 23.In order to make image acquisition module 22 of the present invention still can keep the state of electrical signal transmission between the two when the displacement movement that carries out with respect to substrate 23, the present invention designs unique electrical signal transmitting device especially and solves this problem.
In the preferred embodiment shown in Fig. 6 A and Fig. 6 B, electrical signal transmitting device of the present invention includes a flexible circuit board 46.These image acquisition module 22 combinations also are electrically connected on this flexible circuit board 46.On flexible circuit board 46 and be provided with at least one flexible winding displacement 461, this flexible winding displacement 461 extends and is connected between substrate 23 and the image acquisition module 22, make that when image acquisition module 22 carries out displacement movement with respect to substrate 23 this flexible winding displacement 461 still can both keep the electric connection state simultaneously with substrate 23 and image acquisition module 22.In the preferred embodiment shown in Fig. 6 A, this flexible circuit board 46 is the polygonized structure of rectangle for example.On each edge 462 of this flexible circuit board 46, respectively be provided with one respectively along a cutting groove 463 that parallels with flexible circuit board 46 edges and extend at a distance of the direction of a preset width.And an end of each cutting groove 463 extends to flexible circuit board 46 outer rims 462 other ends and does not then extend to another outer rim, and makes flexible circuit board 46 materials between each cutting groove 463 and each edge 462 constitute cantilever-shaped some flexible winding displacements 461 of swinging in fact.Each flexible winding displacement 461 has a stiff end 4611 that links to each other with flexible circuit board 46 and a free end 4612 that can freely swing respectively.This stiff end is to be electrically connected at image acquisition module 22 by majority circuit layout 4613, and this free end 4612 in conjunction with and be electrically connected at this substrate 23.By this kind flexible circuit board 46 structures, not only can make image acquisition module 22 when displacement, keep the electric connection state simultaneously with substrate 23 all the time, more owing to the edge all round at flexible circuit board 46 is equipped with the cantilever-shaped flexible winding displacement of swinging 461, and can significantly increase the quantity of electric terminal terminal (Contact Pin), and applicable to the image acquisition module 22 of high-order.What deserves to be mentioned is, so use of the present invention cuts out the reason that the cantilever-shaped flexible winding displacement of swinging 461 is used as the electrical signal transmitting device at the edge all round of flexible circuit board 46, mainly be to control the function that reaches focusing because focus control 30 of the present invention need carry out accurate microspur displacement to image acquisition module 22.Carry out the words that signal transmits if use traditional winding displacement (Cable) to connect image acquisition module 22 with substrate 23, then should the tradition winding displacement will need a lot of strands road and become roomy or thick thickly and when being bent, will produce the elastic force of certain degree, so will certainly have influence on the precision that image acquisition module 22 microspur displacements are controlled.Relatively, because the edge all round of flexible circuit board 46 of the present invention all cuts out flexible winding displacement 461, so circuit set on each flexible winding displacement 461 is less, also relatively carefully thin elastic force is little, in addition, the position flexible circuit board 46 all round the elastic force of four flexible winding displacements 461 of edge itself also can form dynamic balance, make image acquisition module 22 be easy to keep horizontality, and can not cause the inclination of image acquisition module 22 fully.
As shown in Figure 7, and in another preferred embodiment, electrical signal transmitting device of the present invention also can be a wireless signal transmitting device, and it includes, and a wireless signal transmitter and wireless receiver 51 (for example infrared ray IR transmitter etc.) is connected on the image acquisition module 22, a wireless signal receiver 52 is incorporated on the substrate 23 and just corresponding with this wireless signal transmitter and wireless receiver 51 an and power lead 53 is connected between image acquisition module 22 and the substrate 23 so that image acquisition module 22 and the required power supply of wireless signal transmitter and wireless receiver 51 starts to be provided.Because the power lead 53 of this preferred embodiment is the transmission signal not in order to power supply to be provided only, so can be very carefully and can not have influence on the accurate microspur person of moving of image acquisition module 22 fully.Therefore, the same image acquisition module 22 that makes of this kind wireless signal transmitting device keeps electric connection state person with substrate 23 all the time simultaneously when displacement.
See also Fig. 8, use, can reach the optical imaging system focus adjustment method of an innovation by the zoom lens group of arranging in pairs or groups of focus control 30 of the present invention as the aforementioned.Among shown in Figure 8 in the preferred embodiment of focus adjustment method of the present invention, the substrate that this optical imaging system includes a zoom lens group, an image acquisition module at least and is provided with some control circuits.This zoom lens group can provide the optical zoom function that switches at least one first enlargement ratio and one second enlargement ratio.And this zoom lens group can be with an extraneous video imaging on image acquisition module, and transfers on the substrate after should external world's video conversion becoming electrical signal by this image acquisition module.This focus adjustment method of the present invention has the following step:
Step 61: a focus control is provided, is incorporated on the image acquisition module, this focus control can drive image acquisition module and carry out limited displacement movement with respect to zoom lens group;
Step 62: use this zoom lens group to carry out the optical zoom function of switching imaging enlargement ratio; And,
Step 63: drive this focus control, be maintained in image sharpness with the position of corresponding fine tuning video acquisition module when zoom lens group is carried out zoom.
The above is to utilize preferred embodiment to describe the present invention in detail, but not limits the scope of the invention.All common those skilled in the art that are familiar with this area all can understand, suitably do slightly change and adjustment, will not lose main idea of the present invention place, also do not break away from spirit of the present invention and claim protection domain.
Claims (10)
1. focus control, be applicable in the optical imaging system, the substrate that this optical imaging system includes a lens group, an image acquisition module at least and is provided with some control circuits, this lens group can be with an extraneous video imaging on image acquisition module, and transfers on the substrate after should external world's video conversion becoming electrical signal by this image acquisition module; It is characterized in that this focus control also includes:
One body in order to holding this lens group, image acquisition module and substrate, and makes image acquisition module can carry out limited displacement movement in body;
One clamping device is incorporated into this image acquisition module, can drive image acquisition module and carry out with respect to lens group and both displacement movements of substrate; And,
One electrical signal transmitting device is got in touch with between clamping device and substrate, can still can keep the state of electrical signal transmission between the two when image acquisition module carries out displacement movement with respect to substrate.
2. focus control as claimed in claim 1, wherein, this electrical signal transmitting device includes a flexible circuit board, this image acquisition module combination also is electrically connected on this flexible circuit board, on flexible circuit board and be provided with at least one flexible winding displacement, this flexible winding displacement extends and is connected between substrate and the image acquisition module, make that this flexible winding displacement still can keep the electric connection state simultaneously with substrate and image acquisition module when image acquisition module carries out displacement movement with respect to substrate;
And, this flexible circuit board is a polygonized structure, a cutting groove that is provided with that an at least one edge along flexible circuit board parallels and extends at a distance of the direction of a preset width in this flexible circuit board, one end of this cutting groove extends to the flexible circuit board outer rim, the other end does not then extend to another outer rim, and make the flexible circuit board between this cutting groove and edge constitute cantilever-shaped this flexible winding displacement of swinging in fact, this flexible winding displacement has a stiff end that links to each other with flexible circuit board, an and free end that can freely swing, this stiff end is electrically connected at image acquisition module, and this free end in conjunction with and be electrically connected at this substrate.
3. focus control as claimed in claim 2 wherein, is provided with this cutting groove respectively to form most flexible winding displacements in each edge of the flexible circuit board of polygonized structure.
4. focus control as claimed in claim 1, wherein, this electrical signal transmitting device is a wireless signal transmitting device, and it includes, and a wireless signal transmitter and wireless receiver is connected on the image acquisition module, a wireless signal receiver is incorporated on the substrate and just corresponding with this a wireless signal transmitter and wireless receiver and power lead is connected between image acquisition module and the substrate so that image acquisition module and the required power supply of wireless signal transmitter and wireless receiver start to be provided.
5. focus control as claimed in claim 1, wherein, this clamping device includes:
At least one permanent magnet, it is incorporated into this image acquisition module, and these permanent magnet two ends have one first relative polarity and one second polarity respectively;
At least one magnetic conductor, it is wound with several coils, and the two ends of this first magnetic conductor have one first extension and one second extension respectively, and the position of this first extension is corresponding with this first polarity of this permanent magnet; And
One guide mechanism, be arranged on the body and interlock in image acquisition module, this guide mechanism can limit image acquisition module only can carry out linear displacement motion and can not rotate motion; Wherein, this body includes a sleeve part of hollow cylindrical, and this guide mechanism more includes:
At least one oblique guide groove is arranged on the outer peripheral edges of this sleeve part of body and corresponding to the position of permanent magnet, makes permanent magnet can be subjected to the restriction and the guiding of guide groove, and carry out oblique linear movement along the bearing of trend of guide groove;
One board is placed in this sleeve part inside of body, is used for carrying and locatees this image acquisition module;
One rotating disk, be placed in this sleeve part inside of body, on this rotating disk, more be provided with and comprise at least one clamping part it is to come clamping in the mode of rotation-sliding mutually it is that the autorotation disk outer rim is passed guide groove and stretched out outside the sleeve part and at least one jaw is arranged at projection arm end to be used for clamping location permanent magnet with supporting this board, at least one projection arm; And,
At least one guide rod is provided with and extends between body and the board, can limit board and only can carry out moving along the linear displacement of this guide rod, and can't rotate; And,
Wherein, this magnetic conductor is provided with around sleeve part is peripheral, and make first extending part terminal and in guide groove corresponding to the first polarity position of permanent magnet, can impel first extension to produce magnetic force by this coil being applied an electric current to drive this permanent magnet along the guide groove oblique movement, and drive rotating disk carries out similar thread rotation in sleeve part displacement movement, and then drive board and image acquisition module carries out moving along the linear displacement of guide rod.
6. focus control as claimed in claim 5, wherein, this at least one magnetic conductor comprises one first magnetic conductor and one second magnetic conductor, each magnetic conductor all is wound with several coils, and the two ends of each magnetic conductor have one first extension and one second extension respectively, wherein, the position of first extension of first magnetic conductor is corresponding with this first polarity of this permanent magnet, and second extension of second magnetic conductor is then corresponding with second polarity of this permanent magnet;
Wherein, this at least one guide rod is arranged at body interior and extends towards board, is provided with guide hole corresponding to the position of guide rod and passes for guide rod on board;
Wherein, this clamping part has a U-shaped opening, and it can hold an edge of board, and the U-shaped aperture pitch of this clamping part is greater than the board edge thickness, makes board present the lax and state of rotation-sliding relatively in the U-shaped opening;
Wherein, more be provided with at least one salient point for the friction force between minimizing and the clamping part in the board edge.
7. focus control as claimed in claim 1, wherein this lens group is a zoom lens group, and it can carry out the zoom work of different enlargement ratios, and this focus control then is at the focal length fine setting work that is maintained in image sharpness when zoom lens group is carried out zoom.
8. optical imaging system with focus control is characterized in that including:
One zoom lens group, it can provide the optical zoom function that switches at least one first enlargement ratio and one second enlargement ratio;
One image acquisition module corresponding to this zoom lens group, can be accepted by an extraneous image of picture that zoom lens group is gathered into, and should external world's video conversion become an electrical signal;
One substrate, it is provided with some control circuits, can accept also to be handled from the electrical signal of image acquisition module; And,
One focus control is incorporated into image acquisition module, can drive image acquisition module and carry out limited displacement movement with respect to zoom lens group, its can be when zoom lens group be carried out zoom the position of corresponding fine tuning video acquisition module to be maintained in image sharpness.
9. optical imaging system as claimed in claim 8, wherein, this focus control more includes:
One body in order to holding this lens group, image acquisition module and substrate, and makes image acquisition module can carry out limited displacement movement in body;
One clamping device is incorporated into this image acquisition module, can drive image acquisition module and carry out with respect to lens group and both displacement movements of substrate; And,
One electrical signal transmitting device is got in touch with between clamping device and substrate, can still can keep the state of electrical signal transmission between the two when image acquisition module carries out displacement movement with respect to substrate;
In the focus control wherein:
This electrical signal transmitting device includes a flexible circuit board, this image acquisition module combination also is electrically connected on this flexible circuit board, on flexible circuit board and be provided with at least one flexible winding displacement, this flexible winding displacement extends and is connected between substrate and the image acquisition module, make that this flexible winding displacement still can keep the electric connection state simultaneously with substrate and image acquisition module when image acquisition module carries out displacement movement with respect to substrate;
This flexible circuit board is a polygonized structure, a cutting groove that is provided with that an at least one edge along flexible circuit board parallels and extends at a distance of the direction of a preset width in this flexible circuit board, one end of this cutting groove extends to the flexible circuit board outer rim, the other end does not then extend to another outer rim, and make the flexible circuit board between this cutting groove and edge constitute cantilever-shaped this flexible winding displacement of swinging in fact, this flexible winding displacement has a stiff end that links to each other with flexible circuit board, an and free end that can freely swing, this stiff end is electrically connected at image acquisition module, and this free end in conjunction with and be electrically connected at this substrate;
Wherein, be provided with this cutting groove respectively in each edge of the flexible circuit board of polygonized structure to form most flexible winding displacements; And,
This clamping device includes:
At least one permanent magnet, it is incorporated into this image acquisition module, and these permanent magnet two ends have one first relative polarity and one second polarity respectively;
At least one magnetic conductor, it is wound with several coils, and the two ends of this first magnetic conductor have one first extension and one second extension respectively, and the position of this first extension is corresponding with this first polarity of this permanent magnet; And
One guide mechanism, be arranged on the body and interlock in image acquisition module, this guide mechanism can limit image acquisition module only can carry out linear displacement motion and can not rotate motion;
Wherein, this body includes a sleeve part of hollow cylindrical, and this guide mechanism more includes:
At least one oblique guide groove is arranged on the outer peripheral edges of this sleeve part of body and corresponding to the position of permanent magnet, makes permanent magnet can be subjected to the restriction and the guiding of guide groove, and carry out oblique linear movement along the bearing of trend of guide groove;
One board is placed in this sleeve part inside of body, is used for carrying and locatees this image acquisition module;
One rotating disk, be placed in this sleeve part inside of body, on this rotating disk, more be provided with and comprise at least one clamping part it is to come clamping in the mode of rotation-sliding mutually it is that the autorotation disk outer rim is passed guide groove and stretched out outside the sleeve part and at least one jaw is arranged at projection arm end to be used for clamping location permanent magnet with supporting this board, at least one projection arm; And,
At least one guide rod is provided with and extends between body and the board, can limit board and only can carry out moving along the linear displacement of this guide rod, and can't rotate.
10. the focus adjustment method of an optical imaging system, the substrate that this optical imaging system includes a zoom lens group, an image acquisition module at least and is provided with some control circuits, this zoom lens group system can provide the optical zoom function that switches at least one first enlargement ratio and one second enlargement ratio, and this zoom lens group can be with an extraneous video imaging on image acquisition module, and transfers on the substrate after should external world's video conversion becoming electrical signal by this image acquisition module; It is characterized in that this focus adjustment method includes the following step:
One focus control is provided, is incorporated on the image acquisition module, this focus control can drive image acquisition module and carry out limited displacement movement with respect to zoom lens group;
Use this zoom lens group to switch the optical zoom function of enlargement ratio; And,
Drive this focus control, be maintained in image sharpness with the position of corresponding fine tuning video acquisition module when zoom lens group is carried out zoom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510124070 CN1975555A (en) | 2005-11-28 | 2005-11-28 | Focusing device, optical imaging system with the same fo cusing device and focusing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510124070 CN1975555A (en) | 2005-11-28 | 2005-11-28 | Focusing device, optical imaging system with the same fo cusing device and focusing method |
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| Publication Number | Publication Date |
|---|---|
| CN1975555A true CN1975555A (en) | 2007-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200510124070 Pending CN1975555A (en) | 2005-11-28 | 2005-11-28 | Focusing device, optical imaging system with the same fo cusing device and focusing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103649806A (en) * | 2011-06-30 | 2014-03-19 | 诺基亚公司 | Arrangement for macro photography |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103649806A (en) * | 2011-06-30 | 2014-03-19 | 诺基亚公司 | Arrangement for macro photography |
| CN103649806B (en) * | 2011-06-30 | 2016-10-26 | 诺基亚技术有限公司 | Arrangement for macro photography |
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