CN1704789A - Lens driving device and imaging device - Google Patents
Lens driving device and imaging device Download PDFInfo
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- CN1704789A CN1704789A CN 200510072757 CN200510072757A CN1704789A CN 1704789 A CN1704789 A CN 1704789A CN 200510072757 CN200510072757 CN 200510072757 CN 200510072757 A CN200510072757 A CN 200510072757A CN 1704789 A CN1704789 A CN 1704789A
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Abstract
A lens driving device includes: a stator having a cylindrical shape, for generating a magnetic field within the cylindrical shape; a rotor located within the cylindrical shape of the stator and being rotation-driven for the stator by a magnetic field created by the stator; a lens holder located further inside the rotor, for holding a plurality of lenses with a small lens thereof being located at an arrangement end of the plurality of lenses; a converting mechanism for converting the direction of force by rotation driving of the rotor into direction along the optical axes of the lenses and transmitting the force in the direction thus converted to the lens holder; and a rotation stopper mechanism formed beside the small lens, for preventing the rotation of the lens holder through physical contact.
Description
Technical field
The present invention relates to lens driver that lens are driven along the direction of its optical axis and the filming apparatus of obtaining the view data that shows the body light that is taken.
Background technology
In the small-sized machine of portable phone or PDA (Personal Digital Assistant) etc. and so on, built-in widely shooting is taken body and obtains the filming apparatus of photographic images of numeral.By in the small-sized machine that always carries usually, filming apparatus being set, just can carry digital camera or video camera, whenever can take like a cork.In addition, in these small-sized machines, generally be equipped with the data communication function that has used wireless or infrared ray etc. in advance, also have can be with captured photographic images in this place immediately to other portable phone or advantages such as transmission such as PC.
But, be built in the filming apparatus in the small-sized machine such as portable phone owing to compare considerably for a short time with common digital camera, so lens or CCD (the Charge Couple Device) composed component of etc.ing big or small or the space of taking in these composed components just are subjected to significantly limiting.Thus, these small-sized machines are in using as the substitute machine of digital camera, the image quality of shoot function or photographic images is just good inadequately, often be that its purposes is restricted under the situation of the alternative memo ground acquisition of picture image, maybe to obtain under the situations such as image that the standby picture of portable phone etc. uses not require the shooting purposes of image quality like that.
About these aspects, in recent years, developing the small ccd of high pixel, the micro objective of high-contrast etc., among the high image qualityization of the photographic images that small-sized machine such as use portable phone or PDA is taken is being made progress apace.As in the enriching of the shoot function of residue problem, be desirably in especially in these small-sized machines, can carry by standardization ground and carry automatic focus function or zoom function in digital camera.
Automatically focus function or zoom function are by in filming apparatus a plurality of lens being moved and realize along the direction of optical axis (following will be called fore-and-aft direction along the direction of optical axis).In digital camera or the digital camera,, the known method that the rotation that utilizes DC motor or step motor etc. arranged, utilize the method etc. of the compression elongation of piezoelectric element as the lens driving method.When these methods being used for such small-sized machine such as portable phone, consider from the miniaturization of device and the viewpoints such as precision of the mobile control of lens, think the method for preferably using following hollow step motor, that is, make the columnar hollow rotor of the periphery of surrounding the lens barrel that has kept lens provide pulse current to rotate by stator to the periphery of surrounding this hollow rotor.As the lens driving method that has used this hollow step motor, following method has for example been proposed, promptly, folder is every such travel mechanisms such as cam mechanisms between lens barrel and rotor, with the direction method of driving (for example with reference to patent documentation 1, patent documentation 2, patent documentation 3) of lens barrel along optical axis, or the method (for example patent documentation 4, patent documentation 5, patent documentation 6) that lens barrel is moved with rotor self, or with lens barrel and the incorporate method of rotor (for example patent documentation 7) etc.According to the method described in the patent documentation in the middle of these methods 4, patent documentation 5, patent documentation 6 and the patent documentation 7, though do not need to be provided with special travel mechanism, just can be with the device integral miniaturization, but, therefore might make image offset in rotation because of the off-centre of lens because lens barrel is moved along fore-and-aft direction.On the other hand, according to method described in patent documentation 1, patent documentation 2, the patent documentation 3 etc., because the revolving force of rotor is located at the power that travel mechanism between rotor and the lens barrel is converted to fore-and-aft direction, therefore by the spline device that move of restriction lens to sense of rotation is set, lens are not moved at fore-and-aft direction rotatably, thus the problem that can avoid off-centre etc. to cause by lens.
In addition, the filming apparatus of using the hollow step motor is made of a plurality of parts such as stator and rotors, and with the inside of these member storages at the firm housing that can resist external stress.By using this housing, even when being subjected to outside power, also can avoid colliding between the parts, or problem such as the rotation of rotor is loosening, can drive lens accurately.
But, the method of being put down in writing in the described patent documentation is being that purpose is considered in digital camera of being applied to general size etc., in the time will directly applying to than digital camera also significantly in the filming apparatus of miniaturization, will produce space that lens can not drive, take in composed component and problem such as can't form.For example, under situation about the method described in patent documentation 1, patent documentation 2, the patent documentation 3 being directly used in the small-sized filming apparatus, the problem that is difficult to form the space that the spline device is set will be arranged.
Patent documentation 1: the spy opens clear 56-147132 communique
Patent documentation 2: the spy opens clear 59-109006 communique
Patent documentation 3: the spy opens clear 59-109007 communique
Patent documentation 4: the spy opens clear 60-415 communique
Patent documentation 5: the spy opens clear 60-416 communique
Patent documentation 6: the spy opens clear 60-417 communique
Patent documentation 7: the spy opens clear 62-195615 communique
Summary of the invention
The objective of the invention is to,, provide a kind of small-sized lens driver and filming apparatus that lens can be driven along optical axis in view of described situation.
The feature of mode one that realizes the lens driver of the present invention of described purpose is to possess:
Stator, it has drum, and forms magnetic field in this drum;
Rotor, it is positioned at the drum of described stator and has the drum coaxial with this drum, is driven with respect to this stator rotation by the magnetic field that is formed by this stator;
Lens holder, it is positioned at the position of inboard of the drum of described rotor, and a plurality of lens are kept side by side according to the mode of the optical axis that makes each lens along the axle of this drum, and make less lens of relative diameter in the middle of these a plurality of lens be positioned at the end of the row of these a plurality of lens;
Throw-over gear, its direction that will be driven the power that produces by the rotation of described rotor is converted to along the direction of the optical axis of described lens, and to described lens holder transmission;
Rotation preventive mechanism, it is located at the side of described lenslet, and utilizes physics to contact to prevent the rotation of described lens holder with respect to described stator.
According to lens driver of the present invention, because a plurality of lens of arranging according to the mode of lenslet being located at the end are kept by lens holder, therefore in the side of lenslet, will produce the space of residual quantity of the diameter of the diameter that is equivalent to lenslet and the lens beyond the lenslet.So, even on being equipped on so small-sized machine such as portable phone the time, rotation preventive mechanism can be set in this space also, thereby can suppress dislocation to wait and a plurality of lens precision are driven goodly.
In addition, in the lens driver of the present invention, best described throw-over gear is by the helicla flute of the inner peripheral surface of being located at rotor, constitute with the helicla flute of the outside of being located at lens holder of this helicla flute interlock.
According to the lens driver of this optimal way, compare with the situation of using cam mechanism etc. as throw-over gear, can dwindle the distance between rotor and lens holder, thus can be with equipment miniaturization.
In addition, in the lens driver of the present invention, best described rotation preventive mechanism extend abreast by optical axis along lens and mutually chimeric guiding block and track constitute, a side of guiding block and track is fixed with respect to lens holder, and is fixed with respect to stator with respect to the opposing party's quilt of a side.
Here, so-called " being fixed with respect to lens holder (stator) " is meant, both can has been to be directly fixed on lens holder or the stator, also can be fixed in indirectly on lens holder or the stator.
Utilize guiding block and the track fixed with respect to lens holder and stator, lens holder just can be prevented the rotation with respect to stator of lens holder reliably by the direction guiding along optical axis.
In addition, the feature of reaching the filming apparatus of the present invention of described purpose is to possess:
Stator, it has drum, and forms magnetic field in this drum;
Rotor, it is positioned at the drum of described stator and has the drum coaxial with this drum, is driven with respect to this stator rotation by the magnetic field that is formed by this stator;
Lens holder, it is positioned at the position of inboard of the drum of described rotor, and a plurality of lens are kept side by side according to the mode of the optical axis that makes each lens along the axle of this drum, and make less lens of relative diameter in the middle of these a plurality of lens be positioned at the end of the row of these a plurality of lens;
Throw-over gear, its direction that will be driven the power that produces by the rotation of described rotor is converted to along the direction of the optical axis of described lens, and to described lens holder transmission;
Rotation preventive mechanism, it is located at the side of described lenslet, and utilizes physics to contact to prevent the rotation of described lens holder with respect to described stator;
Photographic unit, its make pass described lens and penetrate come be taken the body photoimaging and obtain the view data that shows the body light that is taken.
According to filming apparatus of the present invention, even when being located at small-sized machine etc. and going up, also a plurality of lens precision can be driven goodly, can on this small-sized machine, carry automatic focus function or zoom function etc.
The mode two of reaching the lens driver of the present invention of described purpose be with lens at the lens driver that on the direction of optical axis, drives, it is characterized in that possessing:
Stator, it is made of coil and coil box, wherein coil is made by the bundle of the lead that is wound into drum, and the generation magnetic line of force, coil box has the profile of the drum that the surface that covers described coil forms, to in this drum, guide and form magnetic field by the magnetic line of force that this coil produces, and bear the stress that is added on this lens driver;
Rotor, it is positioned at the drum of described stator and has the drum coaxial with this drum, is driven with respect to this stator rotation by the magnetic field that is formed by this stator;
Lens holder, it is positioned at the position of inboard of the drum of described rotor, and lens are kept according to the mode that makes its optical axis along the axle of this drum;
Throw-over gear, its direction that will be driven the power that produces by the rotation of described rotor is converted to along the direction of the optical axis of described lens, and to described lens holder transmission.
For the lens precision is driven goodly, rotor or such parts such as stator or lens were left in the firm housing in the past, and protected these parts not to be subjected to the stress influence that applies from the outside.
According to lens driver of the present invention, in the drum of coil box, be provided with rotor or lens holder or throw-over gear, coil box forms the part of the tectosome that surrounds lens driver.Usually coil box is made of metal in order to guide the magnetic line of force as yoke, has high strength.So; even this lens driver is not left in housing etc.; coil holder is not added parcel ground directly use, can protect the parts such as rotor, lens holder or throw-over gear that surrounded by coil holder not to be subjected to the stress influence that applies from the outside yet.In addition, directly do not use, can realize firm and small-sized lens driver by coil holder not being added parcel ground.
In addition, in lens driver of the present invention, preferably possess upper plate and the lower plate of described coil box from the two ends clamping of the drum of coil box, rotor, lens holder and throw-over gear preferably are incorporated in the space that is surrounded by coil box, upper plate and lower plate.
By upper plate and lower plate are set, just can avoid the significantly maximization of device, prevent the breakage of lens etc. effectively.
In addition, in lens driver of the present invention, preferably possess a plurality of posts with the encirclement coil box of upper plate and lower plate binding.
By upper plate and lower plate are linked with a plurality of posts, on the position that surrounds by their, dispose coil box, just can precision carry out the location of coil box goodly.
In addition, the filming apparatus of the present invention of reaching described purpose is that lens are driven along the direction of its optical axis, with these lens body photoimaging that will be taken, obtains the filming apparatus of the view data of this body light that is taken of demonstration, it is characterized in that possessing:
Stator, it is made of coil and coil box, wherein coil is made by the bundle of the lead that is wound into drum, and the generation magnetic line of force, coil box has the profile of the drum that the surface that covers described coil forms, to in this drum, guide and form magnetic field by the magnetic line of force that this coil produces, and bear the stress that is added on this filming apparatus;
Rotor, it is positioned at the drum of described stator and has the drum coaxial with this drum, is driven with respect to this stator rotation by the magnetic field that is formed by this stator;
Lens holder, it is positioned at the position of inboard of the drum of described rotor, and lens are kept according to the mode that makes its optical axis along the axle of this drum;
Throw-over gear, its direction that will be driven the power that produces by the rotation of described rotor is converted to along the direction of the optical axis of described lens, and to described lens holder transmission;
Photographic unit, its will pass described lens penetrate come be taken the body photoimaging and obtain the view data that shows the body light that is taken.
According to filming apparatus of the present invention,, also the lens precision can be driven goodly even when being applied in very big power.In addition, filming apparatus of the present invention has suppressed the maximization of device, even also can carry on such small-sized machine such as portable phone.
The mode three of reaching the lens driver of the present invention of described purpose be with lens at the lens driver that on the direction of optical axis, drives, it is characterized in that possessing:
Stator, it has drum, and forms magnetic field in this drum;
Rotor, it is positioned at the drum of described stator and has the drum coaxial with this drum, is driven with respect to this stator rotation by the magnetic field that is formed by this stator;
Lens holder, it is positioned at the position of inboard of the drum of described rotor, and lens are kept according to the mode that makes its optical axis along the axle of this drum;
Throw-over gear, its direction that will be driven the power that produces by the rotation of described rotor is converted to along the direction of the optical axis of described lens, and to described lens holder transmission;
Outer cover, its maintenance is by reading the capturing element that passes described lens and obtained the view data that shows the body light that is taken by the body light that is taken of imaging, and cover by the nozzle of the drum of described stator being used, form the accommodation space of described rotor, described lens holder and described throw-over gear with the opposite side of a side of this body light incident that is taken.
According to lens driver of the present invention, be equipped with rotor or lens holder etc. in the inboard of the drum of stator, in addition, on the outer cover that nozzle that will be opposite with the side that the body light that is taken of this stator is injected covers, keep capturing element.So, just can save and be used for capturing element is fixed in cost that new parts are set on the body shell etc. or space etc., and the relative position of lens and capturing element can be fixed, thereby can avoid on photographic images, producing problem such as image offset.
In addition, lens driver of the present invention is equipped with rotor or lens holder or throw-over gear etc. in the accommodation space that is made of stator and outer cover, be integrated into 1 tectosome by capturing element is installed, is formed in be taken necessary parts in the shooting of body on outer cover.So, even the body shell of taking in lens driver or capturing element is not set, also can will directly carry at the lens driver that capturing element has been installed on the outer cover on such small-sized machine such as portable phone, can the miniaturization significantly of device integral body.
In addition, in the lens driver of the present invention, best described outer cover by with the rotor physical property contact, prevent that rotor is to situation about moving with the vertical direction of axle of drum.
When rotor when moving with the vertical direction of axle of drum, the lens holder of inboard that then is provided in the drum of rotor also can rock, perhaps the position of the optical axis of lens will be offset, thereby can't precision drive lens goodly.
According to the lens driver of optimal way of the present invention, special mechanism can be set, and suppress the dislocation of the turning axle of rotor, drive thereby can carry out high-precision lens.
In addition, filming apparatus of the present invention is that lens are being driven on the direction of optical axis, with the lens body photoimaging that will be taken, obtains the filming apparatus of the view data that shows the body light that is taken, and it is characterized in that possessing:
Stator, it has drum, and forms magnetic field in this drum;
Rotor, it is positioned at the drum of described stator and has the drum coaxial with this drum, is driven with respect to this stator rotation by the magnetic field that is formed by this stator;
Lens holder, it is positioned at the position of inboard of the drum of described rotor, and lens are kept according to the mode that makes its optical axis along the axle of this drum;
Throw-over gear, its direction that will be driven the power that produces by the rotation of described rotor is converted to along the direction of the optical axis of described lens, and to described lens holder transmission;
Capturing element, it passes described lens and is obtained the view data that shows the body light that is taken by the body light that is taken of imaging by reading,
Outer cover, it keeps described capturing element, and covers by the nozzle of the drum of described stator being used with the opposite side of a side of this body light incident that is taken, and forms the accommodation space of described rotor, described lens holder and described throw-over gear.
According to filming apparatus of the present invention, can will install integral miniaturization, and lens can driven on the direction of optical axis.In addition, according to filming apparatus of the present invention,, therefore can obtain the photographic images of high image quality owing to the fixed relative position of lens and capturing element.
And, for said filming apparatus among the present invention, though only limit to represent its basic mode here, but this is for fear of repetition, in the said in the present invention filming apparatus, not only comprise described basic mode, but also comprise the variety of way corresponding with each mode of described lens driver.
According to the present invention, can provide the small-sized lens driver and the filming apparatus that lens can be driven along optical axis.
Description of drawings
Fig. 1 has been to use the stereoscopic figure of the filming apparatus of an embodiment of the invention.
Fig. 2 is the sectional view the when face that filming apparatus shown in Figure 11 usefulness is passed straight line II-II is cut off.
Fig. 3 is the figure of expression stator 30 and magnet 50.
Fig. 4 is the stereoscopic figure that goes up outer cover 10.
Fig. 5 is the stereoscopic figure of lens holder 20.
Fig. 6 is the exploded perspective view of filming apparatus 1.
Embodiment
Below with reference to accompanying drawings embodiments of the present invention are described.
Fig. 1 has been to use the stereoscopic figure of the filming apparatus of an embodiment of the invention.
Filming apparatus 1 is the small-sized filming apparatus that is equipped on the portable phone etc., by driving a plurality of lens going up along the direction of optical axis (following this direction is called fore-and-aft direction), and possesses the automatic focus function that the focus of making and the body that is taken coincide.This filming apparatus 1 in appearance, at last outer cover 10, down between the outer cover 40, clamping has the stator 30 of drum, in the inboard of this stator 30, disposes magnet described later and lens etc.In addition, the part of lens holder 20 front sides of maintenance lens and a part of interlock of last outer cover 10.
Fig. 2 is the sectional view the when face that filming apparatus shown in Figure 11 usefulness is passed straight line II-II is cut off.
Among Fig. 2, expression has the last outer cover of representing among Fig. 1 10, following outer cover 40, stator 30, lens holder 20, and in addition, also expression has the 1st lens the 21, the 2nd lens the 22, the 3rd lens 23, magnet 50, rotary body 51, CCD60 etc.
Lens holder 20, magnet 50 and rotary body 51 have the drum coaxial with stator 30, in the inboard of stator 30, begin to dispose successively magnet 50, rotary body 51, lens holder 20 from the side near stator 30.Stator 30 and magnet 50 constitute step motor, when when stator 30 feeds pulse current, and will be with magnet 50 with the rotating speed rotation corresponding with this pulse current.This stator 30 is equivalent to an example of said stator among the present invention, and magnet 50 is equivalent to an example of said rotor among the present invention.In addition, lens holder 20 is equivalent to an example of said lens holder among the present invention.
Here, temporarily the explanation of Fig. 2 is interrupted, used Fig. 3 that stator 30 and magnet 50 are elaborated.
Fig. 3 is the figure of expression stator 30 and magnet 50.
Stator 30 is made of last coil portion 30a and these 2 layers of coil portions of the 30b of lower coil portion.Because last coil portion 30a has identical formation with the 30b of lower coil portion, therefore the explanation of the formation of the 30b of lower coil portion is omitted, only the formation to last coil portion 30a describes.
Last coil portion 30a is surrounded as drum by last coils overwraps 32 and lower coil outer cover 33 and forms, and in the inside that is surrounded by outer cover, takes in the coil 31 that is made of the lead of being reeled.On last coils overwraps 32 and lower coil outer cover 33, be provided with according to the tooth 32a, the 33a that dispose of the mode of interlock alternately respectively in the inboard of drum.Between these teeth 32a and tooth 33a, there is the gap.
Upwards in the coil 31 of the coil 31 of coil portion 30a and the 30b of lower coil portion, alternatively feed pulse current.When being passed into pulse current, in coil 31, will produce the magnetic line of force, this magnetic line of force is guided to the inboard of drum by last coils overwraps 32 and lower coil outer cover 33.When the magnetic line of force that is guided arrives tooth 32a, 33a, will temporarily in air, flow out and cross the gap.Like this, tooth 32a, the 33a of the interlock ground configuration that interlock once just becoming the N utmost point, the opposing party becomes the S utmost point, along the magnetic field that alternatively forms the N utmost point, the S utmost point interior week of the drum of stator 30.
Magnet 50 is for example for passing in the inside of the head of the ring-type that alternatively forms the N utmost point, the S utmost point along interior week by making it, and alternatively is magnetized to the permanent magnet of the N utmost point, the S utmost point along the periphery of drum.Magnet 50 utilizes reacting force and the attractive force with the magnetic field that is formed by stator 30, is driven with respect to stator 30 rotations.
Rotation driving to magnet 50 describes.
Magnet 50 is geomagnetic into 48 utmost points, and the tooth of last coil portion 30a and the 30b of lower coil portion is provided with 48 separately.In addition, on the position of the tooth of the position of the tooth of last coil portion 30a, the 30b of lower coil portion, stagger separately with the amount of half tooth.When stator 30 feeds pulse current shown in as described later, magnet 50 will be with the amount of 1 utmost point as 1 step and rotate, with 48 1 weeks of rotation step.
Make magnet 50 when forward rotating, by above coil portion 30a forward, the 30b of lower coil portion forward, reverse such reiteration reverse, the 30b of lower coil portion of going up coil portion 30a switches on, and just can make magnet 50 along forward rotating reliably.In addition, by above coil portion 30a forward, forward such reiteration reverse, the 30b of lower coil portion reverse, that go up coil portion 30a of the 30b of lower coil portion switches on, and just can make magnet 50 along retrograde rotation.
More than finish the explanation of Fig. 3, get back to Fig. 2 and describe.
Rotary body 51 shown in Figure 2 is bonded in the inboard of magnet 50, is accompanied by the rotation of magnet 50 and rotates.At the inner face of this rotary body 51, be provided with helicla flute 51a, this helicla flute 51a and helicla flute 20a (back narration) interlock of being located at the outside of lens holder 20.
Lens holder 20 maintains from begin the tactic lens with the 1st lens the 21, the 2nd lens the 22, the 3rd lens 23 near a side of last outer cover 1.Among this embodiment, the 1st lens 21 of the diameter minimum in the middle of 3 lens are configured in the end near a side of last outer cover 1.These the 1st lens the 21, the 2nd lens the 22, the 3rd lens 23 satisfy following condition.
At first, the 1st lens 21 are made of glass material in this embodiment, and the face (hereinafter referred to as the surface) of front side (near a side of last outer cover) is the meniscus shape with positive magnification of convex shape.
The 2nd lens 22 are made of plastic material, in this example, are that the back side is that aspherical shape, surface are the meniscus shape with negative magnification of concave.
The 3rd lens 23 are made of plastic material, are that table two sides, the back side is an aspherical shape, the back side near optical axis for concave, have a shape of negative magnification.
In addition, when the paraxial focal length with lens combination integral body is made as f, the paraxial focal length of the 3rd lens 23 is made as f3, the radius-of-curvature on the surface of the 1st lens 21 is made as R1, when the angle of half field-of view of maximum image height is made as θ, then satisfy
0.6＜R1/f＜0.8……(1)
-1.0＜f3/f＜0……(2)
0.60＜tanθ＜0.70……(3)
Satisfy the 1st lens the 21, the 2nd lens the 22, the 3rd lens 23 of aforesaid condition by use, just can constitute high-precision lens combination compactly.
In addition, diameter group is littler mutually for the 1st lens 21 and the 2nd lens 22 and the 3rd lens 23, in the side of the 1st lens 21, vacates the bigger space 2, space than the side of the 2nd lens or the 3rd lens.The 1st lens 21 are equivalent to an example of said lenslet among the present invention.In addition, lens holder 20 is provided with helicla flute 20a in the outside of the part that keeps the 2nd lens 22 and the 3rd lens 23, keeps the periphery of the part of the 1st lens 21 to contact with last outer cover 10.
Mechanism with the direction driving forwards, backwards of this lens holder 20 is described.
When stator 30 feeds pulse current, be accompanied by the rotation of magnet 50,51 per 48 1 weeks of rotation step of rotary body.The helicla flute 51a of rotary body 51 compares the amount that is set to have more for 2 weeks (=96 step) with the helicla flute 51a of lens holder 20, lens 20 can carry out moving of 96 steps.
The revolving force of rotary body 51 is converted to the power of fore-and-aft direction by helicla flute 51a and helicla flute 20a.The power of the fore-and-aft direction that has been converted is delivered to lens holder 20, with lens holder 20 forwards, backwards direction drive.In the present embodiment, (=96 step) at the about mobile 1.25mm of fore-and-aft direction, 1 step was approximately moved 13 μ m to lens holder 20 on fore-and-aft direction under total travel.That is, in this filming apparatus 1, can control lens position with 13 μ m units.An example that the mechanism of helicla flute 51a and helicla flute 20a combination is equivalent to said throw-over gear among the present invention.
Last outer cover shown in Figure 2 10 is by fixing with respect to stator 30, contacts with the outside of the part of maintenance the 1st lens 21 of lens holder 20.
In addition, following outer cover 40 is also by fixing with respect to stator 30, and following outer cover 40 keeps low-pass filter sheet 41 and CCD60.
The body light that is taken that has passed the 1st lens the 21, the 2nd lens 22 and the 3rd lens 23 passes low-pass filter sheet 41 and is received by CCD60.In low-pass filter sheet 41, unnecessarily fine and close spatial frequency composition contained in the body light that is taken is by homogenizing.By through this low-pass filter sheet 41, just can alleviate the problem of mimic colouration or interference stripes etc. and so on.
The body light that is taken that has passed low-pass filter sheet 41 is received by CCD60, generates the view data that shows the body that is taken.CCD60 is equivalent to an example of said photographic unit among the present invention.
In aforesaid filming apparatus 1, realize automatic focus function with following order.And,, adopting the pulse current that feeds forward by to stator 30 here, the example that lens holder 20 is forwards moved describes.
At first, in CCD60, read the body light that is taken roughly, generate the low exploring degrees of data that shows the body light that is taken.The CPU that should low exploring degrees of data be delivered to the portable phone that possesses filming apparatus 1 etc.
Then, in stator 30, feeding is used to make lens holder 20 to move the pulse current forward in 1 step.
When stator 30 feeds pulse current, 1 step of magnet rotation, be accompanied by the rotation of this magnet, rotary body 51 is rotated.The revolving force of rotary body 51 is converted into the power in the place ahead and transmits to lens holder 20, and lens holder 20 forwards moves about 13 μ m.
When lens holder 20 moves, in CCD60, read once more and be taken body light and generate low exploring degrees of data.Should low exploring degrees of data be also transmitted by CPU to the portable phone that possesses filming apparatus 1 etc.
Among the CPU, detect 2 low exploring degrees of data contrast separately of transmit, judges that central which the contrast of detected contrast is big by CCD60.Under the bigger situation of the contrast of low exploring degrees of data in front, feed the reverse pulse current of lens holder 20 rearward being return 1 step to stator 30, under the bigger situation of the contrast of the low exploring degrees of data of back, feed the pulse current forward that lens holder 20 was forwards moved again 1 step to stator 30.
As mentioned above, will lens holder 20 be moved and the processing that detects contrast proceeded for 96 steps at most, till the size counter-rotating of the contrast of the low exploring degrees of data of the contrast of the low exploring degrees of data of front and back.If the counter-rotating of the size of these contrasts then feeds in stator 30 and side's pulse current in the opposite direction of switching on before it, lens holder 20 was fallen back for 1 step.The position of the lens holder 20 of this moment just is called contrast and reaches maximum focusing position.
Filming apparatus 1 constitutes basically as described above.
Here, though the revolving force of magnet 40 is transmitted to lens holder 20 by helicla flute 51a and helicla flute 20a, but when lens holder 20 when moving of sense of rotation is not limited, then since lens holder 20 in rotation forwards, backwards direction move, therefore just might be because of the eccentric image offset that make.For anti-rotation of planting lens holder 20 here, on lens holder 20 and last outer cover 10, be provided with rotation preventive mechanism.Below will describe this rotation preventive mechanism.
Fig. 4 is the stereoscopic figure that goes up outer cover 10, and Fig. 5 is the stereoscopic figure of lens holder 20.
The inner face of outer cover 10 is provided with track (rail) 10a on shown in Figure 4.In addition, in the outside of lens holder shown in Figure 5 20, be provided with the guiding block chimeric (guide) 20b with the track 10a of last outer cover 10.The guiding block 20b of scioptics retainer 20 and the track 10a of last outer cover 10 are chimeric mutually, prevent the rotation of lens holder 20.An example that the mechanism of these guiding blocks 20b and track 10a combination is equivalent to said rotation preventive mechanism among the present invention.
These tracks 10a and guiding block 20b are located in the space 2 of side of the 1st lens 21 shown in Figure 2.This space 2 is because of the 1st lens 21 and the 2nd lens 22 or the 3rd lens 23 littler space that produces of diameter group mutually, by using this space, just can on the small-sized filming apparatus 1 that is equipped on portable phone etc., rotation preventive mechanism be set also, thereby can prevent the rotation of lens holder 20 reliably.
Fig. 6 is the exploded perspective view of filming apparatus 1.
A plurality of posts 11 and following outer cover 40 usefulness Screws 80 that this filming apparatus 1 will be located on the outer cover 10 link configuration stator 30 in by the space of outer cover on these 10, post 11, outer cover 40 encirclements down.
The post of being located on the outer cover 10 11 is members of preparing for the position that determines stator 30.In addition, though Screw 80 also can take off after post 11 and following outer cover 40 usefulness cementing agents etc. are bonding, should example in, even owing to Screw 80 is taken off, the size of filming apparatus 1 can not change yet, and therefore Screw 80 also still is installed after having assembled filming apparatus 1.
In the drum of stator 30, from a side near stator 30, distributed magnet 50, rotary body 51, lens holder 20 successively.The coil box 31,32 that constitutes stator 30 is in order to guide the magnetic line of force and to be made of metal in drum; magnet 50, rotary body 51 and lens holder 20 pass through to be surrounded by this coil box 31,32, and the protected stress influence of avoiding being added on the filming apparatus 1.
Following outer cover 40 is from the nozzle of downside covering stator 30, and has the effect that keeps CCD60 concurrently.So, in the filming apparatus 1 of present embodiment, can save the parts that are used to keep CCD60, thereby can cut down the cost or the accommodation space of parts.
In addition, this filming apparatus 1 is by last outer cover 10, encirclements such as outer cover 40, stator 30 down, and in the space that is surrounded by them, the parts that lens etc. damage easily are contained and are protected.In addition, owing to,, constitute high-intensity 1 tectosome with shoot function therefore only by this filming apparatus 1 maintaining CCD60 on the outer cover 40 down.So, even the housing of taking in filming apparatus 1 is not set, also filming apparatus 1 directly can be carried on such small-sized machine such as portable phone, thus can the miniaturization significantly of device integral body.
Here, in described situation, though control the example of step motor of the rotation of rotor and be illustrated using by apply pulse current to stator, the motor that drives said lens holder among the present invention also can be a DC motor etc.
In addition, in the described situation, though to using CCD to be illustrated as the example of capturing element, said capturing element for example also can be MOS etc. among the present invention.
In addition, in the described situation, though to using helicla flute to be illustrated as the example of throw-over gear, said throw-over gear for example also can be cam path and cam pin etc. among the present invention.
In addition, in the described situation, though to realizing that by driving lens holder the example of automatic focus function is illustrated, but lens driver of the present invention and filming apparatus for example both can be the devices of realizing zoom function, also can be the devices of realizing zoom function and automatic focus function.
In addition, in the described situation, though the example that guiding block is arranged at lens holder, track is arranged at outer cover is illustrated, rotation preventive mechanism of the present invention for example also can be arranged at track lens holder, guide is arranged at outer cover.
Claims (11)
1. lens driver is characterized in that possessing:
Stator, it has drum, and forms magnetic field in this drum;
Rotor, it is positioned at the drum of described stator and has the drum coaxial with this drum, is driven with respect to this stator rotation by the magnetic field that is formed by this stator;
Lens holder, it is positioned at the position of inboard of the drum of described rotor, and a plurality of lens are kept side by side according to the mode of the optical axis that makes each lens along the axle of this drum, and make less lens of relative diameter in the middle of these a plurality of lens be positioned at the end of the row of these a plurality of lens;
Throw-over gear, its direction that will be driven the power that produces by the rotation of described rotor is converted to along the direction of the optical axis of described lens, and to described lens holder transmission;
Rotation preventive mechanism, it is located at the side of described lenslet, and utilizes physics to contact to prevent the rotation of described lens holder with respect to described stator.
2. lens driver according to claim 1 is characterized in that, described throw-over gear constitutes by the helicla flute of the inner peripheral surface of being located at described rotor with the helicla flute of the outside of being located at described lens holder of this helicla flute interlock.
3. lens driver according to claim 1, it is characterized in that, described rotation preventive mechanism is extended abreast by the optical axis along described lens and mutual chimeric guiding block and track constitutes, side in this guiding block and the track is fixed with respect to described lens holder, and is fixed with respect to described stator with the corresponding the opposing party of this side.
4. filming apparatus is characterized in that possessing:
Stator, it has drum, and forms magnetic field in this drum;
Rotor, it is positioned at the drum of described stator and has the drum coaxial with this drum, is driven with respect to this stator rotation by the magnetic field that is formed by this stator;
Lens holder, it is positioned at the position of inboard of the drum of described rotor, and a plurality of lens are kept side by side according to the mode of the optical axis that makes each lens along the axle of this drum, and make less lens of relative diameter in the middle of these a plurality of lens be positioned at the end of the row of these a plurality of lens;
Throw-over gear, its direction that will be driven the power that produces by the rotation of described rotor is converted to along the direction of the optical axis of described lens, and to described lens holder transmission;
Rotation preventive mechanism, it is located at the side of described lenslet, and utilizes physics to contact to prevent the rotation of described lens holder with respect to described stator;
Photographic unit, its make pass described lens and penetrate come be taken the body photoimaging and obtain the view data that shows the body light that is taken.
5. a lens driver is with the lens driver of lens along the direction driving of its optical axis, it is characterized in that possessing:
Stator, it is made of coil and coil box, wherein coil is made by the bundle of the lead that is wound into drum, and the generation magnetic line of force, coil box has the profile of the drum that the surface that covers described coil forms, to in this drum, guide and form magnetic field by the magnetic line of force that this coil produces, and bear the stress that is added on this lens driver;
Rotor, it is positioned at the drum of described stator and has the drum coaxial with this drum, is driven with respect to this stator rotation by the magnetic field that is formed by this stator;
Lens holder, it is positioned at the position of inboard of the drum of described rotor, and lens are kept according to the mode that makes its optical axis along the axle of this drum;
Throw-over gear, its direction that will be driven the power that produces by the rotation of described rotor is converted to along the direction of the optical axis of described lens, and to described lens holder transmission.
6. lens driver according to claim 5, it is characterized in that, possess upper plate and the lower plate of described coil box from the two ends clamping of the drum of this coil box, described rotor, described lens holder and described throw-over gear are incorporated in the space that is surrounded by described coil box, described upper plate and described lower plate.
7. lens driver according to claim 6 is characterized in that, possesses a plurality of posts with the described coil box of encirclement of described upper plate and the binding of described lower plate.
8. filming apparatus is that the direction of lens along its optical axis driven, and with these lens body photoimaging that will be taken, obtains the filming apparatus of the view data of this body light that is taken of demonstration, it is characterized in that possessing:
Stator, it is made of coil and coil box, wherein coil is made by the bundle of the lead that is wound into drum, and the generation magnetic line of force, coil box has the profile of the drum that the surface that covers described coil forms, to in this drum, guide and form magnetic field by the magnetic line of force that this coil produces, and bear the stress that is added on this filming apparatus;
Rotor, it is positioned at the drum of described stator and has the drum coaxial with this drum, is driven with respect to this stator rotation by the magnetic field that is formed by this stator;
Lens holder, it is positioned at the position of inboard of the drum of described rotor, and lens are kept according to the mode that makes its optical axis along the axle of this drum;
Throw-over gear, its direction that will be driven the power that produces by the rotation of described rotor is converted to along the direction of the optical axis of described lens, and to described lens holder transmission;
Photographic unit, its will pass described lens penetrate come be taken the body photoimaging and obtain the view data that shows the body light that is taken.
9. a lens driver is with the lens driver of lens along the direction driving of its optical axis, it is characterized in that possessing:
Stator, it has drum, and forms magnetic field in this drum;
Rotor, it is positioned at the drum of described stator and has the drum coaxial with this drum, is driven with respect to this stator rotation by the magnetic field that is formed by this stator;
Lens holder, it is positioned at the position of inboard of the drum of described rotor, and lens are kept according to the mode that makes its optical axis along the axle of this drum;
Throw-over gear, its direction that will be driven the power that produces by the rotation of described rotor is converted to along the direction of the optical axis of described lens, and to described lens holder transmission;
Outer cover, its maintenance is by reading the capturing element that passes described lens and obtained the view data that shows the body light that is taken by the body light that is taken of imaging, and cover by the nozzle of the drum of described stator being used, form the accommodation space of described rotor, described lens holder and described throw-over gear with the opposite side of a side of this body light incident that is taken.
10. lens driver according to claim 9 is characterized in that, described outer cover prevents that by contacting with described rotor physics this rotor from moving to the direction vertical with the axle of drum.
11. a filming apparatus is that lens are driven along the direction of its optical axis, with these lens body photoimaging that will be taken, obtains the filming apparatus of the view data of this body light that is taken of demonstration, it is characterized in that possessing:
Stator, it has drum, and forms magnetic field in this drum;
Rotor, it is positioned at the drum of described stator and has the drum coaxial with this drum, is driven with respect to this stator rotation by the magnetic field that is formed by this stator;
Lens holder, it is positioned at the position of inboard of the drum of described rotor, and lens are kept according to the mode that makes its optical axis along the axle of this drum;
Throw-over gear, its direction that will be driven the power that produces by the rotation of described rotor is converted to along the direction of the optical axis of described lens, and to described lens holder transmission;
Capturing element, it passes described lens and is obtained the view data that shows the body light that is taken by the body light that is taken of imaging by reading,
Outer cover, it keeps described capturing element, and covers by the nozzle of the drum of described stator being used with the opposite side of a side of this body light incident that is taken, and forms the accommodation space of described rotor, described lens holder and described throw-over gear.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004161709 | 2004-05-31 | ||
| JP2004161710 | 2004-05-31 | ||
| JP2004161709A JP4481725B2 (en) | 2004-05-31 | 2004-05-31 | Imaging device |
| JP2004169889 | 2004-06-08 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1704789A true CN1704789A (en) | 2005-12-07 |
| CN100360977C CN100360977C (en) | 2008-01-09 |
Family
ID=35497997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100727572A Expired - Fee Related CN100360977C (en) | 2004-05-31 | 2005-05-19 | Lens driving device and imaging device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4481725B2 (en) |
| CN (1) | CN100360977C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581819A (en) * | 2008-05-15 | 2009-11-18 | 鸿富锦精密工业（深圳）有限公司 | Lens module |
| CN106161902A (en) * | 2016-08-19 | 2016-11-23 | 京东方科技集团股份有限公司 | A kind of photographic head module, electronic equipment and image pickup method |
| CN110663001A (en) * | 2017-05-17 | 2020-01-07 | 法雷奥系统公司 | Device for protecting optical sensor |
| CN114265172A (en) * | 2020-09-16 | 2022-04-01 | 三星电机株式会社 | Camera module and electronic device |
| CN115514861A (en) * | 2021-06-23 | 2022-12-23 | 格科微电子（上海）有限公司 | Driving device, camera module and electronic equipment |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100552485C (en) * | 2006-11-22 | 2009-10-21 | 富准精密工业(深圳)有限公司 | Embedded focus lens structure |
| TWI456283B (en) * | 2009-11-05 | 2014-10-11 | Hon Hai Prec Ind Co Ltd | Lens module |
| KR101911875B1 (en) * | 2017-09-01 | 2018-10-25 | 엘지이노텍 주식회사 | Voice coil motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639084A (en) * | 1984-01-10 | 1987-01-27 | Canon Kabushiki Kaisha | Lens barrel in which motor capable of selecting stepping drive or brushless drive is provided |
| JP2751151B2 (en) * | 1986-05-15 | 1998-05-18 | ソニー株式会社 | Camera focusing device |
| JPS63163807A (en) * | 1986-12-26 | 1988-07-07 | Copal Electron Co Ltd | Motor for automatic lens focusing |
| JPH0618322Y2 (en) * | 1987-05-21 | 1994-05-11 | オリンパス光学工業株式会社 | Lens barrel |
| JP2964915B2 (en) * | 1995-04-28 | 1999-10-18 | 日本ビクター株式会社 | Lens drive control device |
-
2004
- 2004-05-31 JP JP2004161709A patent/JP4481725B2/en not_active Expired - Fee Related
-
2005
- 2005-05-19 CN CNB2005100727572A patent/CN100360977C/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101581819A (en) * | 2008-05-15 | 2009-11-18 | 鸿富锦精密工业（深圳）有限公司 | Lens module |
| CN106161902A (en) * | 2016-08-19 | 2016-11-23 | 京东方科技集团股份有限公司 | A kind of photographic head module, electronic equipment and image pickup method |
| WO2018032926A1 (en) * | 2016-08-19 | 2018-02-22 | 京东方科技集团股份有限公司 | Camera module, electronic device and photographing method |
| CN106161902B (en) * | 2016-08-19 | 2021-08-03 | 京东方科技集团股份有限公司 | Camera module, electronic equipment and shooting method |
| US11252310B2 (en) | 2016-08-19 | 2022-02-15 | Boe Technology Group Co., Ltd. | Camera module, electronic device and photographing method |
| CN110663001A (en) * | 2017-05-17 | 2020-01-07 | 法雷奥系统公司 | Device for protecting optical sensor |
| US11762194B2 (en) | 2017-05-17 | 2023-09-19 | Valeo Systemes D'essuyage | Device for protecting an optical sensor |
| CN114265172A (en) * | 2020-09-16 | 2022-04-01 | 三星电机株式会社 | Camera module and electronic device |
| CN115514861A (en) * | 2021-06-23 | 2022-12-23 | 格科微电子（上海）有限公司 | Driving device, camera module and electronic equipment |
| CN115514861B (en) * | 2021-06-23 | 2023-08-11 | 格科微电子（上海）有限公司 | Driving device, camera module and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100360977C (en) | 2008-01-09 |
| JP4481725B2 (en) | 2010-06-16 |
| JP2005345514A (en) | 2005-12-15 |
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Granted publication date: 20080109 Termination date: 20140519 |