CN201765371U - Lens driving device - Google Patents
Lens driving device Download PDFInfo
- Publication number
- CN201765371U CN201765371U CN201020511715.0U CN201020511715U CN201765371U CN 201765371 U CN201765371 U CN 201765371U CN 201020511715 U CN201020511715 U CN 201020511715U CN 201765371 U CN201765371 U CN 201765371U
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- frame
- nut
- optical axis
- members
- lens
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Abstract
A lens driving device comprises: a first frame part (19); a second frame part (20) which moves along the optical axis direction; a guide shaft (24), which guides the second frame part along the optical axis direction; an anti-rotating part (19f, 20c) formed on the first and the second frame part which prevents the second frame part from rotating around the guide shaft, while allows the second frame part to move along the optical axis direction; a driving source (31) which drives the second frame part along the optical axis direction; a screw shaped rotary shaft (31a) which rotates under the driving force from the driving source; a pressing part (32) clamped with the first frame part to restrict itself from rotating around the rotary shaft, while screwed with the rotary shaft to allow itself to move along the optical axis direction; the pressing part receives the rotation of the rotary shaft and moves along the optical axis direction, thereby presses the second frame part; and a force application part (33) extended across the pressing part and the second frame part.
Description
Technical field
The utility model relates to lens driver, specifically, relates to the quietness technology of using driving motor to make the mobile lens driver of predetermined lens frame advance and retreat.
Background technology
In the past, in the lens barrel of the equipment that is applied to band such as camera camera function, lens barrel with lens driver is widely used, regulate action (automatic focusing action) in order to carry out auto-focus, this lens driver makes lens frame parts (being called the AF lens frame) retire movingly along the direction of optical axis is enterprising, and a plurality of optical lenses that these lens frame parts are used for keeping constituting lens barrel help the optical lens (being called the AF lens) of focal adjustments action.
In this lens driver in the past,, generally adopt driving motors such as stepping motor as its drive source.And, utilize this driving motor and be screwed on the combination of the nut on the threaded portion of driving shaft of this driving motor, constitute and make the mechanism of predetermined lens frame along the optical axis direction advance and retreat.
For lens driver in the past, when driving motor rotates, screw togather with the threaded portion of the driving shaft of this driving motor and the nut that is in the confined state of rotation moves along optical axis direction with this structure.This nut be in by force application part all the time with the state of predetermined lens frame butt.Therefore, rotate described nut when optical axis direction moves thereby be driven at described driving motor, described thereupon predetermined lens frame also moves to equidirectional.
About the lens driver of this form, for example in TOHKEMY 2005-173442 communique, TOHKEMY 2001-242369 communique etc. various forms of lens drivers are disclosed.
, in lens driver in the past, for example, driving motor rotates to both forward and reverse directions, and described nut advance and retreat are moved.Therefore, when the rotation direction of driving motor is switched, produce between nut and threaded portion and screw togather looseningly, this is unavoidable.Loosening carried out following research etc. about this screwing togather, that is,, formed nut and lens frame all the time by the state of the application of force at the force application part that is arranged on both moving directions between nut and the lens frame, promptly checks and balance on the direction of optical axis etc.
In addition, when driving driving motor, in addition, for example in the eccentric swing of driving shaft and bearing portion etc., also might produce unnecessary noise and vibration etc.If the driving motor in the lens driver self vibration, because lens barrel self resonance of this lens driver of application etc. might cause bigger noise.
The utility model content
The purpose of this utility model is to provide a kind of lens driver, the nut that screws togather in the threaded portion of rotating with being driven by driving motor is advanced and retreat when mobile along optical axis direction, suppress to help the quiet of lens barrel thus owing to driving motor and mobile lens frame, nut etc. vibrate the noise that produces.
Lens driver of the present utility model is characterised in that described lens driver constitutes to have: the 1st members of frame; The 2nd members of frame, it moves along optical axis direction; Leading axle, it guides described the 2nd members of frame along described optical axis direction; Prevent rotating part, it is formed at described the 1st members of frame and described the 2nd members of frame, is used to prevent described the 2nd members of frame around described leading axle rotation, and allows described the 2nd members of frame moving at described optical axis direction; Drive source is used for driving described the 2nd members of frame at described optical axis direction; The rotation axis of screw-like, its acceptance is rotated from described drive source drives power; Push part, thereby it engages with described the 1st members of frame and limits described push part around the rotation of described rotation axis, and thereby this push part and described rotation axis screw togather and allow described push part moving at described optical axis direction, this push part is accepted the rotation of described rotation axis and is moved along described optical axis direction, thereby pushes described the 2nd members of frame; And force application part, it is set up in described push part and described the 2nd members of frame.
About the purpose of this utility model and effect, will be clearer and more definite according to following detailed description.
According to the utility model, a kind of lens driver can be provided, drive and the nut of the threaded portion of rotating is advanced and retreat when mobile along optical axis direction being screwed together in by driving motor, suppress to help the quiet of lens barrel thus owing to driving motor and mobile lens frame, nut etc. vibrate the noise that produces.
Description of drawings
Fig. 1 is the exploded perspective view of first half of lens barrel of using the lens driver of an embodiment of the present utility model.
Fig. 2 is the exploded perspective view of latter half of lens barrel of using the lens driver of an embodiment of the present utility model.
Fig. 3 is that the major part of primary structure of the lens driver of an expression embodiment of the present utility model is amplified exploded perspective view.
Fig. 4 is the vertical view when the lens barrel of lens driver of an embodiment of the present utility model is used in top view.
Fig. 5 amplifies the major part enlarged drawing of expression with the position that the label among Fig. 4 " 5 " illustrates.
Fig. 6 is the stereographic map that only nut in the lens driver of an embodiment of the present utility model is taken out and amplifies expression.
Fig. 7 takes out the nut in the lens driver of an embodiment of the present utility model and force application part and amplifies stereographic map expression, when the angle different with Fig. 6 observed.
Embodiment
Below, before the concrete structure of the lens driver that an embodiment of the present utility model is described, at first use Fig. 1, Fig. 2 that the structure in general of the lens barrel of using this lens driver is described.
Use the lens barrel 1 of the lens driver 2 (with reference to Fig. 2 etc.) of present embodiment, begin the order towards rear side according to the forefront under the state that has assembled this lens barrel 1 along optical axis O, successively by constituting with lower part etc.: front side cover 11, it has the lens baffle component; First group of lens frame 12, it keeps first lens combination; Second group of lens frame 13, it keeps second lens combination; Force application spring parts 22, it is to the application of force between second group of lens frame 13 and the 3rd group of lens frame 14 narrating later; The 3rd group of lens frame 14, it keeps the 3rd lens combination; Directly advance frame 15, it limits 12,13,14 rotations of described first group, second group, the 3rd group lens frame; Cam frame 16, it drives described first group, second group lens frame 12,13 advance and retreat; Rotating frame 17, it drives described the 3rd group of lens frame 14 advance and retreat; Mobile frame 18, it drives described cam frame 16; Fixed frame 19 (the 1st members of frame), it keeps described each members of frame in inside, and self is fixed in equipment such as being suitable for camera; And the 4th group of lens frame 20 (the 2nd members of frame), it maintains the 4th group of lens that help the automatic focusing action.
Be provided with image unit 21 with imaging apparatus etc. at the rear of lens barrel 1.It is roughly consistent with optical axis O that this image unit 21 is configured to the approximate centre that makes imaging apparatus, and make the front surface (sensitive surface) and optical axis O approximate vertical of imaging apparatus.
In the lens barrel 1 of this structure, the 4th group of lens frame 20 is the lens frame that maintains the 4th group of lens that help the automatic focusing action as mentioned above.The 4th group of lens frame 20 constitutes scioptics drive unit 2 and the 2nd members of frame that moves in the direction advance and retreat along optical axis O in the inside of fixed frame 19.
That is, the 4th group of lens frame 20 constitutes and has: the main part of toroidal, and it keeps the 4th group of lens at the substantial middle position; With two arm 20a, 20b, they respectively from this main part at circumferential diverse location towards radially extending out.
The 4th group of frame the 1st arm 20a forms and radially has protuberance 20c endways.This protuberance 20c with directly advance groove 19f (with reference to Fig. 4) and engage, this directly advances the inner peripheral surface that groove 19f is formed at fixed frame 19, and with parallel and linearly along the direction of optical axis O.
In the 4th group of frame the 2nd arm 20b, be formed with hanging axis supported hole 20d at position radially near terminal.And, more be formed with nut abutting part 20e than this hanging axis supported hole 20d by the position of end side, this nut abutting part 20e is used for nut 32 (narration in the back) butt with a part that constitutes this lens driver 2, and the 4th group of lens frame 20 advance and retreat are moved.In addition, the least significant end portion at this nut abutting part 20e is formed with projection 20h.This projection 20h is connected with the position-detection sensor 30a (with reference to Fig. 5) that is made of photo interrupter (photo interrupter), and constitute detecting the position detection unit of the position of the 4th group of lens frame 20, this position-detection sensor 30a is installed on the flexible printing substrate 30 on the outer peripheral face of being located at the 4th group of lens frame 20.
In hanging axis supported hole 20d, connect and dispose hanging axis 24.In hole 19c (with reference to Fig. 3), this hole 19c is formed at the fixed position of the motor support portion 19b (narration in the back is with reference to Fig. 3) of fixed frame 19 to one end of this hanging axis 24 by pivotal support.And, among the hole 19cc of the medial surface of the lens drive division lid 19a that the other end of hanging axis 24 is narrated in the back by pivotal support.In this case, hanging axis 24 is provided with abreast with optical axis O.Therefore, the 4th group of lens frame 20 is directed into to moving on the direction of optical axis O along hanging axis 24.That is, hanging axis 24 is the leading axles that guide the 4th group of lens frame 20 in the direction along optical axis O.Meanwhile, the protuberance 20c of the 4th group of frame the 1st arm 20a engages with the groove 19f (with reference to Fig. 4) that directly advances of fixed frame 19, limits the 4th group of lens frame 20 thus and rotates around hanging axis 24.Promptly, the protuberance 20c formation of directly advancing groove 19f and the 4th group of lens frame 20 of fixed frame 19 prevents rotating part, be used to prevent the 4th group of lens frame 20 (the 2nd members of frame) around hanging axis 24 (leading axle) rotation, and allow the 4th group of lens frame 20 (the 2nd members of frame) to move in direction along optical axis O.
In addition, at the spring hang part 20f of the nut abutting part 20e that is formed at the 4th group of frame the 2nd arm 20b (with reference to Fig. 3, Fig. 5) with between the spring hang part 19d (with reference to Fig. 3) that the fixed part of the motor support portion of fixed frame 19 19b forms, tensioning frame is provided with the 4th group of frame force application spring 23 of austerity.In addition, in the present embodiment, the 4th group of for example volute spring that frame force application spring 23 adopts as shown in the figure, but its form is not limited thereto.
The lens driver 2 of present embodiment is by on the outer peripheral face of fixed frame 19, mainly be installed in the integrally formed motor support portion 19b of this frame 19 on various component parts constitute.That is, this lens driver 2 mainly is made of driving motor 31, motor reel 31a, nut 32, nut force application spring 33 etc.
Nut the 1st arm 32a forms and radially is prominent shape, at the face of nut the 1st arm 32a, is formed with the hemispherical teat 32d of convex in the direction parallel with optical axis.Under this nut 32 was screwed together in state on the motor reel 31a, the nut rotation of this nut the 1st arm 32a and motor support portion 19b prevented groove 19e (with reference to Fig. 4, Fig. 5) butt.Nut rotation prevents that groove 19e from being the groove that is formed at fixed frame 19 inside, and parallel with optical axis and along motor reel 31a.Thus, the nut rotation by motor support portion 19b prevents groove 19e and nut the 1st arm 32a butt, limits the rotation of this nut 32.
In addition, when nut 32 is configured in the position of regulation with the state that screws togather with motor reel 31a, a face 32e of nut 32 as mentioned above with the nut abutting part 20e butt of the 4th group of lens frame 20.At this moment, the face of nut the 1st arm 32a (with a face 32e of nut 32 be same face) with the inside surface butt of lens drive division lid 19a.Here, if both this butt positions are the plane each other, then might produce absorption, interlock.Therefore, in the present embodiment, form hemispherical teat 32d, and make the inside surface butt of this hemispherical teat 32d and lens drive division lid 19a, make both butt states become a contact thus at the face of nut the 1st arm 32a.
Nut the 2nd arm 32b forms flat shape and roughly is the L word shape, is setting up an end of nut force application spring 33 at this nut the 2nd arm 32b.
Nut force application spring 33 is force application parts of the austerity between the arm that is erected at nut 32 and the 4th group of lens frame 20 on the direction on the plane vertical with optical axis O.In addition, in the present embodiment, for example volute spring that nut force application spring 33 adopts as shown in the figure, but its form is not limited thereto.
Specifically, one end of nut force application spring 33 is erected on nut the 2nd arm 32b of nut 32 as mentioned above, the other end of nut force application spring 33 is erected on the spring hang part 20g (with reference to Fig. 3), and this spring hang part 20g is formed at the nut abutting part 20e of the 4th group of frame the 2nd arm 20b of the 4th group of lens frame 20.
In another face 32f (with reference to Fig. 7) of nut 32, for example across threaded hole 32c and opposed position is formed with two hemispherical teat 32g.This hemispherical teat 32g is provided with for following purpose, promptly, when nut 32 moves and near driving motor 31 sides and when becoming state with a butt of this driving motor 31 in the direction along optical axis O, another face 32f that makes the one side of this motor 31 and nut 32 is with a contact form butt, thereby suppresses interlock.
And the one side of motor support portion 19b is with the state of the nut abutting part 20e that taken in the 4th group of lens frame 20 in inside etc., and 19a covers from optical axis O direction by lens drive division lid.Lens drive division lid 19a uses screw 26 grades to be fixed in the fixed part of motor support portion 19b.As mentioned above, when becoming this state, the other end of hanging axis 24 by pivotal support in the hole 19cc of the medial surface of lens drive division lid 19a.
Below, the effect of the lens driver in the lens barrel 1 of the present embodiment that constitutes like this is described.
At first, when driving motor 31 was driven, motor reel 31a was driven in rotation thereupon.At this moment, the nut 32 that is limited to rotate with the state that is screwed on this motor reel 31a is along with the rotation of motor reel 31a, to moving along the direction of optical axis O (Fig. 2, shown in Figure 3 arrow A 1 direction or arrow A 2 directions).
Here, when arrow A 1 direction along the direction of optical axis O moved, the 4th group of lens frame 20 be by the tensile force of the deflation direction of the 4th group of frame force application spring 23 at nut 32, moves to arrow A 1 direction identical with nut 32.
On the other hand, when arrow A 2 directions along the direction of optical axis O moved, the deflation tensile force that nut 32 overcomes the 4th group of frame force application spring 23 pushed the 4th group of lens frame 20 at nut 32.Thus, the 4th group of lens frame 20 moves to arrow A 2 directions identical with nut 32.
, between the spring hang part 20g of nut the 2nd arm 32b of nut 32 and the 4th group of lens frame 20, set up nut force application spring 33.The effect of this nut force application spring 33 is as described below.
The 1st effect of nut force application spring 33 is the swings that suppress the motor reel 31a that causes owing to the application of force to the arrow X1 of Fig. 5 direction.
In the lens driver of present embodiment, the main body of driving motor 31 utilizes screw 25 to be fixed in motor support portion 19b as mentioned above.And the base end part of motor reel 31a is connected with driving motor 31, and terminal part is positioned at the 20ee of hole portion of the nut abutting part 20e of the 4th group of lens frame 20 with the free end state.That is, motor reel 31a is in and can runs through the state that is inserted in the 20ee of hole portion rotatably.In this state, when motor reel 31a rotates, there is the swing trend bigger of the terminal part of motor reel 31a than base end part.
Therefore, in the present embodiment, the arrow X1 direction of nut force application spring 33 on the line at the center that connects spring hang part 20g and threaded hole 32c be to nut 32 application of forces, thus the terminal part of motor reel 31a is configured in the position of the all-the-time stable in the 20ee of hole portion of nut abutting part 20e.Thus, the swing when inhibition motor reel 31a is driven in rotation, and then obtain to reduce anti noise.
The 2nd effect of nut force application spring 33 is to remove because becoming flexible between nut 32 that the application of force to the arrow X2 of Fig. 5 direction causes and the motor reel 31a.
In the lens driver of present embodiment, nut 32 screws togather by screw thread is chimeric with motor reel 31a.By the positive and negative rotation of motor reel 31a, nut 32 is moved in arrow A 1 direction and the advance and retreat of the either direction in arrow A 2 directions to Fig. 2 on the direction of optical axis O.When the sense of rotation of motor reel 31a is counter-rotating etc., might produce noise because screw togather loosening.
Therefore, in the present embodiment, nut force application spring 33 towards with arrow X1 direction be the arrow X2 direction of equidirectional to nut 32 application of forces, make nut 32 be in all the time state thus to the motor reel 31a application of force.Thus, when motor reel 31a is driven in rotation, can obtain to reduce owing to the loosening anti noise that produces of screwing togather of motor reel 31a and nut 32.
The 3rd effect of nut force application spring 33 is the effects in the position of sense of rotation of restriction nut 32.As mentioned above, nut 32 by nut force application spring 33 to the application of force of arrow X1, X2 direction and by the application of force.In this case, the wall that nut 32 prevents groove 19e to nut rotation is as pivot point, and promptly the position that the label M1 among Fig. 5 is represented is endowed moment as fulcrum.
Therefore, in the present embodiment, at nut 32 nut the 1st arm 32a is set, the nut rotation of this nut the 1st arm 32a and motor support portion 19b prevents groove 19e butt, limits the rotation of nut 32 thus.In this case, rotate the butt unstable state timing that prevents groove 19e, might produce noise, so preferably keep both butt states all the time at nut the 1st arm 32a and nut.
Therefore, set the position M2 (with reference to Fig. 5) that becomes an end in contact nut the 2nd arm 32b that makes nut force application spring 33, become from the position of the rotation center O1 off-centre of nut 32.This is described with reference to Fig. 5.The line segment of the center O 1 of attaching nut 32 threaded hole 32c and spring hang part 20g is made as m, the maximum notch depth 32i of portion of the notch part 32h of nut the 2nd arm 32b that is provided with at nut 32 forms and arrives or the state of the described line segment m of no show, the hook portion of nut force application spring 33 does not hang on the described line segment m, as a result, the application of force of nut force application spring 33 is given turning moment with respect to described center O 1 to nut 32.According to this structure, the application of force of nut force application spring 33 is as nut 32 is played a role to the arrow X3 of Fig. 5 direction Power of Spin.Therefore, can keep a wall that the rotation of nut the 1st arm 32a and nut the prevents groove 19e steady state (SS) of butt all the time, and then obtain to reduce anti noise.
That the 4th effect of nut force application spring 33 is to be produced by the application of force towards the arrow X4 of Fig. 5 direction, to of the application of force effect of the 4th group of lens frame 20 towards sense of rotation.
As mentioned above, in the lens driver of present embodiment, the 4th group of lens frame 20 moves freely in the direction along optical axis O by hanging axis 24.And the protuberance 20c of the 4th group of frame the 1st arm 20a engages with the groove 19f that directly advances of fixed frame 19, limits the 4th group of lens frame 20 thus and rotates around hanging axis 24.In this case, protuberance 20c with directly advance between the groove 19f to occur engage under the situation about becoming flexible, might produce noise.
Therefore, in the present embodiment, nut force application spring 33 to the direction of nut 32, be the spring hang part 20g application of force of the arrow X4 direction of Fig. 5 to the 4th group of lens frame 20, the 4th group of lens frame 20 played a role around the strength that hanging axis 24 rotates to the clockwise direction of Fig. 5.Thus, can keep the protuberance 20c of the 4th group of frame the 1st arm 20a one side interior steady state (SS) of butt all the time, and then obtain to reduce anti noise with directly advancing groove 19f.
Lens driver according to the above-mentioned embodiment of above explanation, only by between nut 32 and the 4th group of lens frame 20, appending configuration nut force application spring 33, this nut force application spring 33 is erected at along the direction on the plane vertical with optical axis O, can be suppressed at and only rely in the lens driver of existing structure towards along the application of force of the direction of optical axis O and vibration untamed, that produce from driving motor, nut, lens frame etc., and can suppress the noise that produces owing to these vibrations.
In addition, the utility model is not limited to above-mentioned embodiment, certainly carries out various distortion and application in the scope that does not break away from aim of the present utility model.In addition, comprise the utility model in various stages in the above-described embodiment, can propose various utility models according to the appropriate combination of disclosed a plurality of inscapes.For example, even in the several inscapes of deletion from all disclosed inscapes of an above-mentioned embodiment, also can solve utility model and want the problem that solves and obtain under the situation of effect of utility model, delete structure after this inscape and also can be used as utility model and propose.The utility model is not subjected to the restriction of the specific implementations except that subsidiary claims qualification.
Claims (3)
1. a lens driver is characterized in that, described lens driver constitutes to have:
The 1st members of frame;
The 2nd members of frame, it moves along optical axis direction;
Leading axle, it guides described the 2nd members of frame along described optical axis direction;
Prevent rotating part, it is formed at described the 1st members of frame and described the 2nd members of frame, is used to prevent described the 2nd members of frame around described leading axle rotation, and allows described the 2nd members of frame to move at described optical axis direction;
Drive source, it is used for driving described the 2nd members of frame at described optical axis direction;
The rotation axis of screw-like, its acceptance is rotated from described drive source drives power;
Push part, thereby it engages with described the 1st members of frame and limits this push part around the rotation of described rotation axis, and thereby this push part and described rotation axis screw togather and allow this push part moving at described optical axis direction, this push part is accepted the rotation of described rotation axis and is moved along described optical axis direction, thereby pushes described the 2nd members of frame; And
Force application part, it is set up in described push part and described the 2nd members of frame.
2. lens driver according to claim 1 is characterized in that,
The described rotating part that prevents is made of with directly the advance groove parallel with described optical axis of being located at described the 1st members of frame the protuberance of being located at described the 2nd members of frame, and this protuberance and this directly advance the groove tabling.
3. lens driver according to claim 1 is characterized in that,
Described force application part is erected on the direction on the plane vertical with described optical axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020511715.0U CN201765371U (en) | 2010-08-30 | 2010-08-30 | Lens driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020511715.0U CN201765371U (en) | 2010-08-30 | 2010-08-30 | Lens driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201765371U true CN201765371U (en) | 2011-03-16 |
Family
ID=43717979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020511715.0U Expired - Fee Related CN201765371U (en) | 2010-08-30 | 2010-08-30 | Lens driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201765371U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102736208A (en) * | 2011-03-31 | 2012-10-17 | 亚洲光学股份有限公司 | Lens module |
-
2010
- 2010-08-30 CN CN201020511715.0U patent/CN201765371U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102736208A (en) * | 2011-03-31 | 2012-10-17 | 亚洲光学股份有限公司 | Lens module |
| CN102736208B (en) * | 2011-03-31 | 2014-09-10 | 亚洲光学股份有限公司 | Lens module |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110316 Termination date: 20180830 |
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| CF01 | Termination of patent right due to non-payment of annual fee |