CN102478697B - Lens drive device - Google Patents
Lens drive device Download PDFInfo
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- CN102478697B CN102478697B CN201110401016.XA CN201110401016A CN102478697B CN 102478697 B CN102478697 B CN 102478697B CN 201110401016 A CN201110401016 A CN 201110401016A CN 102478697 B CN102478697 B CN 102478697B
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Abstract
Provided is a lens drive device, capable of decreasing the tilt angle of the lens amid shooting. The lens drive device comprises a front spring(22) and a rear spring (24) arranged at the front side and the rear side of the optical axis (O) of the lens frame (14). The front spring(22) and rear spring (24) respectively comprise: internal side end portions (222, 242) arranged upon the lens frame (14), external side end portions (224, 244) arranged upon fixing portions (12, 18, 20, 28), and two arm portions (226, 246) connecting the internal side end portions and the external side end portions. The included angle, between the direction when the spring constant in the circumferential direction of the flat of the front spring (22) orthogonal to the optical axis (O) is the largest and the direction when the spring constant in the circumferential direction of the flat of the rear spring(24) orthogonal to the optical axis (O) is the largest, is within 45 degrees.
Description
Technical field
The present invention relates to lens driver, especially, relate to the lens driver that the lens mount (movable part) that can make to keep lens subassembly (lens drum) moves at the optical axis direction of lens.
Background technology
At the mobile phone with video camera, be equipped with portable small-sized video camera.On this portable small-sized video camera, use automatic focusing lens driver.All the time, various focusing lens drivers have been proposed.The drive source using as this lens driver (driving method), has been known to use the VCM mode of voice coil motor (VCM).At the lens driver of VCM mode, the magnetic circuit that possesses drive coil and formed by yoke and permanent magnet as drive source.Lens driver is also referred to as driver.
Lens driver (driver) possesses lens mount, and this lens mount has for keeping the cylindrical portion of lens subassembly.Drive coil is fixed on lens mount to be positioned at the mode of the surrounding of cylindrical portion.Permanent magnet and drive coil relatively configure.Yoke keeps permanent magnet.Yoke is included the shielding yoke (シ mono-Le De ヨ mono-Network) of the tubular of wall configuration permanent magnet, in centre across the drive coil a plurality of back of the body yokes relative with permanent magnet (バ Star Network ヨ mono-Network).The magnetic circuit consisting of with permanent magnet yoke is worked as fixed part together with matrix part.Optical axis direction both sides in the cylindrical portion of lens mount are provided with a pair of leaf spring.A pair of leaf spring is supported for lens mount, under the state of radial location, and can be in optical axis direction displacement.Therefore, lens mount (movable part) and magnetic circuit (fixed part) between there is gap, and be configured to can be in optical axis direction displacement.
In above-mentioned a pair of leaf spring, a side is called as upside leaf spring, and opposite side is called as downside leaf spring.But in actual behaviour in service, because optical axis direction becomes fore-and-aft direction, therefore, upside leaf spring is also referred to as front side spring, downside leaf spring is also referred to as rear side spring.In general, upside leaf spring (front side spring) and downside leaf spring (rear side spring) are mutually roughly the same shape.
All the time, as prior art document (patent documentation), propose to have various lens drivers.
For example, patent documentation 1 (TOHKEMY 2006-58662 communique) discloses following lens driver, as each above-mentioned front side spring and above-mentioned rear side spring, uses by being installed on the end, inner circumferential side on movable part, the leaf spring that is installed on the outer circumferential side end on fixed part and connects three bar portions (arm) formation of end, inner circumferential side and outer circumferential side end.In this patent documentation 1, each bar portion (arm) by each bar portion (arm) of front side spring with rear side spring, is circumferentially being configured in same position.
In addition, patent documentation 2 (TOHKEMY 2008-26619 communique) discloses following lens driver, and front side spring and rear side spring have respectively two bar portions (arm), and each bar portion (arm) is located at mutually orthogonal position.
And, patent documentation 3 (TOHKEMY 2008-139811 communique) discloses following lens driver, this lens driver has spring members, and this spring members possesses: a plurality of arms that are connected in the outside connecting portion of supporter (fixed part), the inner side connecting portion that is connected in mobile lens body (movable part) and connection inner side connecting portion and outside connecting portion.And, in the disclosed lens driver of patent documentation 3, following example is disclosed, arm forms by two, spring members two separated positions on optical axis direction are configured to as the first roughly the same spring members of the shape of arm and the second spring members, and the first spring members and the second spring members are configured in the direction of 90 ° of angle position skews.
Prior art document
Patent documentation
Patent documentation 1: TOHKEMY 2006-58662 communique (Fig. 2)
Patent documentation 2: TOHKEMY 2008-26619 communique (claim 3, Fig. 1, Fig. 2)
Patent documentation 3: TOHKEMY 2008-139811 communique (claim 15, Fig. 1, Fig. 8)
Automatic focusing in this structure is used in lens driver, and the miniaturization along with portable small-sized video camera, is required miniaturization.Therefore, be necessary that miniaturization forms the component parts of lens driver for automatic focusing.Due to this miniaturization requirement, as the permanent magnet of component parts, be miniaturized the magnetic force (magnetic field) therefore being produced by permanent magnet also die down (diminishing).Although leaf spring (spring members) is miniaturized too, the quantity of its arm (bar portion) is three when above, its spring constant became (greatly) by force.For spring constant is died down (diminishing), also considered the method for the thickness of slab attenuation of leaf spring (spring members), but this was existed to limit.Its result, as above-mentioned patent documentation 2 or above-mentioned patent documentation 3 disclosed, for spring constant is died down (diminishing), at small-sized lens driver, used arm by two leaf springs that form (spring members).
As mentioned above, in the actual behaviour in service of portable small-sized video camera (shooting situation), generally under the state of fore-and-aft direction (horizontal direction), take take optical axis direction (lens focus direction).Therefore, during shooting, upside leaf spring (front side spring) is configured in lens mount (movable part) before, and downside leaf spring (rear side spring) is configured in lens mount (movable part) before.
In the situation that arm is made as to two, in patent documentation 2 and patent documentation 3, front side spring and rear side spring are configured in the mutually orthogonal position of each arm.In other words, the first spring members (rear side spring) and the second spring members (front side spring) are configured in to the direction of angle position skew 90.
But if the number of arm is made as to two, leaf spring (spring members) is in circumferential (sense of rotation on the face with light shaft positive cross) position, its spring constant can change.Therefore, in the configuration of patent documentation 2 and the disclosed leaf spring of patent documentation 3 (spring members), the circumferential medi-spring constant of front side spring (the second spring members) is that the circumferential medi-spring constant of peaked direction and rear side spring (the first spring members) is peaked direction mutually orthogonal (being offset 90 °).If spring constant is large, the displacement of leaf spring diminishes, if spring constant is little, the displacement of leaf spring becomes large, therefore in the configuration of patent documentation 2 and the disclosed leaf spring of patent documentation 3 (spring members), it is large that the angle of inclination of lens mount when above-mentioned shooting (movable part) becomes.In other words, become large take the angle of inclination of the lens under the posture of the sense of rotation arbitrarily (circumferentially) that optical axis direction (focus direction) is axle.
Summary of the invention
Therefore, problem of the present invention is to provide the lens driver that a kind of angle of inclination of the lens can make to take time diminishes.
Other problem of the present invention is to provide the lens driver that a kind of angle of inclination of the lens can make to take in wider angular range time diminishes.
Other objects of the present invention can become clear and definite along with the progress of explanation.
The lens driver 10 of mode of the present invention is the lens driver that can carry out position adjustment to lens subassembly in optical axis O direction, possesses: the lens mount 14 that keeps said lens assembly; To be positioned at the fixing annular drive coil 16 of mode of the outside of this lens mount; Fixed part, this fixed part comprises the permanent magnet relative with this drive coil 18 and keeps the yoke 20 of this permanent magnet; Be located at the front side spring 22 of the optical axis O direction front side of said lens frame; And the rear side spring 24 of being located at the optical axis O direction rear side of said lens frame, said lens drive unit is characterised in that, above-mentioned front side spring 22 and above-mentioned rear side spring 24 comprise separately: be installed on the end, inner circumferential side 222,242 on said lens frame; Be installed on the outer circumferential side end 224,244 on above-mentioned fixed part; And two arms 226,246 that connect end, above-mentioned inner circumferential side and above-mentioned outer circumferential side end, the spring constant making progress in week of the plane of optical axis O quadrature above-mentioned front side spring 22 and above-mentioned is that the spring constant making progress in week of the plane of optical axis O quadrature peaked direction and above-mentioned rear side spring 24 and above-mentioned is that angle between peaked direction is in miter angle degree.
In the lens driver 10 of the invention described above, preferred above-mentioned angle is in 30 degree angles.More preferably above-mentioned angle is actually 0 degree.Above-mentioned two arms 226,246 can be along circumferential setting.
And above-mentioned reference marks is that only an example, is not limited to this certainly in order easily to understand and the symbol of mark.
Effect of the present invention is as follows.
In the present invention, the spring constant making progress in week that is peaked direction and plane rear side spring and light shaft positive cross by the spring constant making progress in the week of plane front side spring and light shaft positive cross is that the angle between peaked direction is set as in miter angle degree, therefore can dwindle the angle of inclination of the lens while taking.
Accompanying drawing explanation
Fig. 1 is the exploded perspective view of the lens driver of an embodiment of the invention.
Fig. 2 means the vertical view of the configuration relation (" configuration of 0 degree ") of upside leaf spring (front side spring) that the lens driver shown in Fig. 1 is used and downside leaf spring (rear side spring).
Fig. 3 means for the front side spring shown in Fig. 2, by the installation site of two arms after surrounding's dextrorotation of optical axis turn 90 degrees, the vertical view of the configuration relation of front side spring and rear side spring (" configurations of 90 degree ").
Fig. 4 means in the lens driver shown in Fig. 1, distribution of weight at movable part is in the first occasion of front side spring 50%, rear side spring 50%, the circumferential spring constant of the front side spring of the configuration relation of front side spring and rear side spring during for " 0 degree configuration " and rear side spring, with horizontal posture in take the figure of optical axis direction (focus direction) as the analog result of the variation at the angle of inclination (pitching (チ Le ト)) of the lens of the occasion that axially sense of rotation (circumferentially) has been rotated arbitrarily.
Fig. 5 means in the lens driver shown in Fig. 1, distribution of weight at movable part is in the first occasion of front side spring 50%, rear side spring 50%, the circumferential spring constant of the front side spring of the configuration relation of front side spring and rear side spring during for " 15 degree configurations " and rear side spring, with horizontal posture in take the figure of optical axis direction (focus direction) as the analog result of the variation at the angle of inclination (pitching) of the lens of the occasion that axially sense of rotation (circumferentially) has been rotated arbitrarily.
Fig. 6 means in the lens driver shown in Fig. 1, distribution of weight at movable part is in the first occasion of front side spring 50%, rear side spring 50%, the circumferential spring constant of the front side spring of the configuration relation of front side spring and rear side spring during for " 30 degree configurations " and rear side spring, with horizontal posture in take the figure of optical axis direction (focus direction) as the analog result of the variation at the angle of inclination (pitching) of the lens of the occasion that axially sense of rotation (circumferentially) has been rotated arbitrarily.
Fig. 7 means in the lens driver shown in Fig. 1, distribution of weight at movable part is in the first occasion of front side spring 50%, rear side spring 50%, the circumferential spring constant of the front side spring of the configuration relation of front side spring and rear side spring during for " 15 degree configurations " and rear side spring, with horizontal posture in take the figure of optical axis direction (focus direction) as the analog result of the variation at the angle of inclination (pitching) of the lens of the occasion that axially sense of rotation (circumferentially) has been rotated arbitrarily.
Fig. 8 means in the lens driver shown in Fig. 1, distribution of weight at movable part is in the first occasion of front side spring 50%, rear side spring 50%, the circumferential spring constant of the front side spring of the configuration relation of front side spring and rear side spring during for " 30 degree configurations " and rear side spring, with horizontal posture in take the figure of optical axis direction (focus direction) as the analog result of the variation at the angle of inclination (pitching) of the lens of the occasion that axially sense of rotation (circumferentially) has been rotated arbitrarily.
Fig. 9 means in the lens driver shown in Fig. 1, distribution of weight at movable part is in the second occasion of front side spring 70%, rear side spring 30%, the circumferential spring constant of the front side spring of the configuration relation of front side spring and rear side spring during for " 0 degree configuration " and rear side spring, with horizontal posture in take the figure of optical axis direction (focus direction) as the analog result of the variation at the angle of inclination (pitching) of the lens of the occasion that axially sense of rotation (circumferentially) has been rotated arbitrarily.
Figure 10 means in the lens driver shown in Fig. 1, distribution of weight at movable part is in the second occasion of front side spring 70%, rear side spring 30%, the circumferential spring constant of the front side spring of the configuration relation of front side spring and rear side spring during for " 15 degree configurations " and rear side spring, with horizontal posture in take the figure of optical axis direction (focus direction) as the analog result of the variation at the angle of inclination (pitching) of the lens of the occasion that axially sense of rotation (circumferentially) has been rotated arbitrarily.
Figure 11 means in the lens driver shown in Fig. 1, distribution of weight at movable part is in the second occasion of front side spring 70%, rear side spring 30%, the circumferential spring constant of the front side spring of the configuration relation of front side spring and rear side spring during for " 30 degree configurations " and rear side spring, with horizontal posture in take the figure of optical axis direction (focus direction) as the analog result of the variation at the angle of inclination (pitching) of the lens of the occasion that axially sense of rotation (circumferentially) has been rotated arbitrarily.
Figure 12 means in the lens driver shown in Fig. 1, distribution of weight at movable part is in the second occasion of front side spring 70%, rear side spring 30%, the circumferential spring constant of the front side spring of the configuration relation of front side spring and rear side spring during for " 15 degree configurations " and rear side spring, with horizontal posture in take the figure of optical axis direction (focus direction) as the analog result of the variation at the angle of inclination (pitching) of the lens of the occasion that axially sense of rotation (circumferentially) has been rotated arbitrarily.
Figure 13 means in the lens driver shown in Fig. 1, distribution of weight at movable part is in the second occasion of front side spring 70%, rear side spring 30%, the circumferential spring constant of the front side spring of the configuration relation of front side spring and rear side spring during for " 30 degree configurations " and rear side spring, with horizontal posture in take the figure of optical axis direction (focus direction) as the analog result of the variation at the angle of inclination (pitching) of the lens of the occasion that axially sense of rotation (circumferentially) has been rotated arbitrarily.
In figure:
10-lens driver (driver), 12-driver pedestal, 12a-circular open portion, 12b-insertion groove, 122-projection, 14-lens mount, 140-cylindrical portion, 140-1-surface of contact, 142-female screw, 16-drive coil, 162-long leg, 164-holds limit portion, 18-permanent magnet, 182-tabular permanent magnet pieces, 20-yoke, 202-shields yoke (urceolus portion), 204-annular end, 204a-patchhole, 206-carries on the back yoke (inner side vertical stretch), 22-upside leaf spring (front side spring), end, 222-inner circumferential side, 224-outer circumferential side end, 224a-through hole, 226-arm, 24-downside leaf spring (rear side spring), end, 242-inner circumferential side, 244-outer circumferential side end, 244a-embedded hole, 246-arm, 28-cover, 28a-circular open portion, 282-projection, 30-liner, 30a-embedded hole, 36-electrode, O-optical axis (driving shaft).
Embodiment
Below, with reference to the accompanying drawings of embodiments of the present invention.
The lens driver 10 of an embodiment of the invention is described with reference to Fig. 1.Fig. 1 is the exploded perspective view of lens driver 10.
At this, as shown in Figure 1, use orthogonal coordinate system (X, Y, Z).Under the state shown in Fig. 1, in orthogonal coordinate system (X, Y, Z), X-direction is fore-and-aft direction (depth direction), and Y direction is left and right directions (Width), and Z-direction is above-below direction (short transverse).And in the example shown in Fig. 1, above-below direction Z is optical axis O direction (focus direction).
But, in actual behaviour in service, optical axis O direction (focus direction), be that Z-direction becomes fore-and-aft direction.In other words, the upper direction of Z axis become the place ahead to, the lower direction of Z axis become rear to.
Illustrated lens driver 10 is provided on the mobile phone with video camera that can automatic focusing.Lens driver 10 is for making lens subassembly (lens drum) (not shown) mobile in optical axis O direction (focus direction).Therefore, optical axis O is driving shaft.Lens driver 10 is called as driver.Lens driver 10 has the driver pedestal 12 of the downside (rear side) of Z-direction of being configured in (optical axis O direction).Although not shown, in the bottom (rear portion) of this driver pedestal 12, be equipped with the imaging apparatus being configured on sensor base plate.This imaging apparatus is made a video recording and is converted to electric signal the subject image by lens subassembly imaging.Imaging apparatus is such as by formations such as CCD (charge coupled device) type imageing sensor, CMOS (complementary metal oxide semiconductor) type imageing sensors.Therefore, by assembling lens driving device 10, sensor base plate, imaging apparatus, form photographing module.
Lens driver 10 possesses: have for keeping the resin lens mount 14 of the cylindrical portion 140 of lens subassembly (lens drum); To be positioned at the mode of the surrounding of cylindrical portion 140, be fixed on the drive coil 16 on this lens mount 14; The permanent magnet 18 relatively configuring with this drive coil; The yoke 20 that keeps this permanent magnet 18; Be located at a pair of leaf spring 22,24 of optical axis O direction both sides of the cylindrical portion 140 of lens subassembly 14.By permanent magnet 18 and yoke 20, form magnetic circuit.A pair of leaf spring 22,24 is with can be at the mode support of lens assembly 14 of optical axis O direction top offset under the state of locating diametrically.In a pair of leaf spring 22,24, leaf spring 22 is called as upside leaf spring, another leaf spring 24 is called as downside leaf spring.
In addition, as mentioned above, in the actual behaviour in service of the mobile phone with video camera, the upper direction of Z-direction (optical axis O direction) become the place ahead to, the lower direction of Z-direction (optical axis O direction) become rear to.Therefore, the upside leaf spring 22 front side spring that is otherwise known as, the downside leaf spring 24 rear side spring that is otherwise known as.
Upside leaf spring (front side spring) 22 and downside leaf spring (rear side spring) 24 are such as being formed by metal systems such as stainless steel or beryllium-bronzes.And upside leaf spring (front side spring) 22 and downside leaf spring (rear side spring) 24 are by carrying out punch process or utilized the etching and processing of photoetching technique to manufacture the thin plate of regulation.And etching and processing is more better than punch process.Its reason is, in etching and processing, can not leave residual stress at leaf spring.
Yoke 20 is quadrangular barrel shape.That is, yoke 20 comprises: the urceolus portion 202 of quadrangular barrel shape; The tetragonal annular end 204 extending to the inner side of urceolus portion in the upper end of this urceolus portion 202; And at four jiaos of four inner side vertical stretches 206 that extend to vertical lower abreast with optical axis O of the inner side of this annular end 204.Urceolus portion 202 is called as shielding yoke, and four inner side vertical stretches 206 are called as back of the body yoke.
On the other hand, drive coil 16 is actually anistree tubular.That is, drive coil 16 comprises four long legs 162, is configured in four short legs 164 between these four long legs.The cylindrical portion 140 of lens mount 14 has four surface of contact 140-1 that give prominence to radial direction outside with the angle intervals of 90 °.Four long legs 162 of bonding drive coil 16 on these four surface of contact 140-1.That is, drive coil 16 is stuck at four surface of contact 140-1.
To this, permanent magnet 18 consists of relative four rectangular-shaped (tabular) permanent magnet pieces 182 of four long legs 162 with drive coil 16.Four rectangular-shaped permanent magnet pieces 182 are configured in the internal face on four limits of the urceolus portion (shielding yoke) 202 of yoke 20.In a word, permanent magnet 18 consists of the permanent magnet pieces 182 of four rectangular-shaped (tabulars) of each side that is configured in the urceolus portion (shielding yoke) 202 of the quadrangular barrel shape of yoke 20.
Inner peripheral surface in the urceolus portion (shielding yoke) 202 of yoke 20, has permanent magnet 18 with drive coil 16 across arranged spaced.
Upside leaf spring (front side spring) 22 is configured in the upper end side (front) of the optical axis O direction of lens mount 14, and downside leaf spring (rear side spring) 24 is configured in the lower end side (rear end side) of the optical axis O direction of lens mount 14.
Upside leaf spring (front side spring) 22 has the end, inner circumferential side 222 of the upper end (front end) that is installed on lens mount 14 and the outer circumferential side end 224 that is installed on as described later the annular end 204 of yoke 20.Between end, inner circumferential side 222 and outer circumferential side end 224, be provided with two arms 226.Each arm 226, along circumferentially arranging, connects end, inner circumferential side 222 and outer circumferential side end 224.
Cover 28 is fixed on by the annular end 204 of yoke 20 in the outer circumferential side end 224 of upside leaf spring 22.Specifically, cover 28 becomes the four square ring shapes at central portion with the 28a of circular open portion.Cover 28 has four outstanding projections 282 downwards at Qi Sijiao.The annular end 204 of yoke 20 has four patchhole 204a that insert four projections 282 at Qi Sijiao.The outer circumferential side end 224 of upside leaf spring 22 has four embedded hole 224a that embed these four projections 282.Therefore, four projections 282 of cover 28 embed four embedded hole 224a of the outer circumferential side end 224 of upside leaf spring (front side spring) 22 by four through hole 204a of the ring-type upper end 204 of yoke 20.
Downside leaf spring (rear side spring) 24 has the end, inner circumferential side 242 of the lower end (rear end) that is installed on as described later lens mount 14 and is installed on as described later the outer circumferential side end 244 on driver pedestal 12.Between end, inner circumferential side 242 and outer circumferential side end 144, be provided with two arms 246.Each arm 246, along circumferentially arranging, connects end, inner circumferential side 242 and outer circumferential side end 244.
Two of having for the end, inner circumferential side 242 of fixing downside leaf spring (rear side spring) 24 in its lower end (rear end) of lens mount 14 are fixing with protuberances (not shown).And the end, inner circumferential side 242 of downside leaf spring (rear side spring) 24 has these two fixing two embedded hole 242a with protuberance of embedding.By thermally welded these two the fixing protuberances of using, the lower end (rear end) of lens mount 14 is fixed in end, inner circumferential side 242.
On the other hand, the outer circumferential side end 244 of downside leaf spring (rear side spring) 24 is fixed on driver pedestal 12 by liner 30.Specifically, driver pedestal 12 is for having the four side ring shapes of the 12a of circular open portion at central portion.Driver pedestal 12 has four outstanding upward projections 122 at Qi Sijiao.The outer circumferential side end 244 of downside leaf spring (rear side spring) 24 has four through hole 244a that these four projections 122 connect.Liner 30 has four embedded hole 30a that these four projections 122 embed.Therefore, four of driver pedestal 12 projections 122 embed four embedded hole 30a of liner 30 by four through hole 244a of the outer circumferential side end 244 of downside leaf spring (rear side spring) 24.
The bottom of lens mount 14 (rearward end) embeds the 12a of circular open portion of driver pedestal 12 with a gap.In other words, the bottom of lens mount 14 (rearward end) is relative across interval with the 12a of circular open portion of driver pedestal 12.
At the internal perisporium of the cylindrical portion 140 of lens mount 14, cut and be provided with female screw 142.On the other hand, although not shown, at the periphery wall of lens subassembly (lens drum), cut and be provided with the pin thread of being combined with above-mentioned female screw 142 screw threads.Therefore, when lens subassembly (lens drum) is installed on to lens mount 14, by lens subassembly (lens drum) is rotated and carries out screw thread combination along optical axis O direction around optical axis O with respect to the cylindrical portion 140 of lens mount 14, thereby lens subassembly (lens drum) is received in lens mount 14, utilizes bonding agent etc. to be bonded with each other.
Lens driver 10 possesses for supply with the pair of electrodes 36 of electric power to drive coil 16.Driver pedestal 12 has for plugging a pair of insertion groove 12b of this pair of electrodes 36.
By utilizing pair of electrodes 36 to drive coil 16 energisings, thereby utilize the magnetic field of permanent magnet 18 and by the interaction that flows in the electric current generation magnetic field of drive coil 16, can to lens mount 14 (lens subassembly), adjust position in optical axis O direction.
In said lens drive unit 10, keep the lens mount 14 of lens subassembly and the combination of drive coil 16 as movable part 14,16 work that are configured in the column of central portion.In addition, the combination of driver pedestal 12, permanent magnet 18, yoke 20 and cover 28 is as fixed part 12,18,20,28 work that are configured in the outside of movable part 14,16.In addition, the cylindrical portion 140 of lens mount 14 is provided with four abutting part 140-2 in the top.These four abutting part 140-2 are by being connected to the position corresponding to lower surface of four extensions 284 of cover 28 formation circular open 28a, thereby play the excessively mobile effect of restriction lens mount 14.
The configuration relation of the upside leaf spring using at the lens driver 10 shown in Fig. 2 presentation graphs 1 (front side spring) 22 and downside leaf spring (rear side spring) 24.
As mentioned above, in the actual behaviour in service (shooting situation) of the mobile phone with video camera, the upper direction of Z-direction (optical axis O direction) become the place ahead to, the lower direction of Z-direction (optical axis O direction) become rear to.Therefore, the rear of X-direction is to becoming upper direction, and the place ahead of X-direction is to becoming lower direction.And the right of Y direction is right equally, the left of Y direction to be left equally to.In the following description, use the direction in actual behaviour in service (shooting situation) to carry out direction.In addition, the posture of the mobile phone with video camera in actual behaviour in service (shooting situation) is called to " laterally posture ".
At this, the configuration relation of the front side spring 22 shown in Fig. 2 and rear side spring 24 is called to " configuration of 0 degree ".
In this " configuration of 0 degree ", with regard to rear side spring 24, with respect to above-below direction X-direction, counterclockwise only rotating the position of approximately 30 degree, the rear end of lens mount 14 is fixed in its end, inner circumferential side 242.In other words, with regard to rear side spring 24, its two arms 246 are from the position that has counterclockwise only rotated approximately 30 degree with respect to above-below direction X-direction to circumferential extension.On the other hand, with regard to front side spring 22, two arms 246 from the roughly upper end of its end, inner circumferential side 242 and roughly lower end to extending axially.That is,, with regard to front side spring 22, its two arms 225 are from being that the position of 0 degree is to circumferential extension with respect to above-below direction X.Therefore, each arm 226 of front side spring 22 is disposed in the position that is upwards offset approximately 30 degree week with each arm 246 of rear side spring 24.
Fig. 3 represents to be directed to the front side spring 22 shown in Fig. 2, by the installation site of two arms 226 after optical axis O dextrorotation turn 90 degrees, the configuration relation of front side spring 22 and rear side spring 24.The configuration of rear side spring 24 is identical with the rear side spring 24 shown in Fig. 2.At this, the configuration relation of the front side spring 22 shown in this Fig. 3 and rear side spring 24 is called to " configurations of 90 degree ".
In should " 90 degree configurations ", with regard to rear side spring 24, with the occasion of Fig. 2 similarly, in the positions that only rotated counterclockwise approximately 30 degree with respect to above-below direction X-direction, the rear end of lens mount 14 is fixed in its end, inner circumferential side 242.In other words, with regard to rear side spring 24, its two arms 246 are from the position that has only rotated approximately 30 degree against pointer with respect to above-below direction X-direction to circumferential extension.On the other hand, with regard to front side spring 22, its two arms 246 from respect to direction X only rotated in the clockwise direction the roughly right-hand member of its end, inner circumferential side 242 after 90 degree and roughly left end to circumferential extension.That is,, with regard to front side spring 22, its two arms 225 are from the position that has only rotated clockwise 90 degree with respect to above-below direction X-direction to circumferential extension.Therefore, each arm 226 of front side spring 22 is disposed in the position that has upwards been offset about 120 degree week with each arm 246 of rear side spring 24.
Therefore, in this manual " configuration of A degree " mean that the configuration former state of the rear side spring 24 shown in Fig. 2 is constant, the installation site that is configured as its two arms 226 that makes the front side spring 22 shown in Fig. 2 is the configuration relation to the A degree that turned clockwise around optical axis O.In addition, in the present invention " configuration of A degree " mean that the configuration former state of the rear side spring 24 shown in Fig. 2 is constant, the installation site that is configured as its two arms 226 that makes the front side spring 22 shown in Fig. 2 around optical axis O to the configuration relation that has been rotated counterclockwise A degree.
Next, with reference to Fig. 4 to Figure 13 explanation with respect to the circumferential spring constant configuration relation of front side spring 22 and rear side spring 24, front side spring 22 and rear side spring 24 with in horizontal posture, take the variation at angle of inclination (pitching) of the lens that optical axis O direction (focus direction) is the occasion of rotating to any sense of rotation (circumferentially).
Below represent the distribution of weight that supports the front side spring 22 of movable part 14,16 and the movable part of rear side spring 24 14,16 to be set as follows the analog result of two occasions.The first occasion is that the distribution of weight of movable part 14,16 is the occasion that front side spring 22 is 50%, rear side spring 24 is 50%.The second occasion is that the distribution of weight of movable part 14,16 is the occasion that front side spring 22 is 70%, rear side spring 24 is 30%.
First, the analog result that is the first occasion that front side spring 22 is 50%, rear side spring 24 is 50% to the distribution of weight of movable part 14,16 describes.
Fig. 4 to Fig. 8 means that the distribution of weight at movable part 14,16 is in the first occasion, the front side spring 22 when the configuration relation of front side spring 22 and rear side spring 24 is respectively " 0 degree configuration ", " configurations of 15 degree ", " configurations of 30 degree ", " configurations of 15 degree " and " configurations of 30 degree " and the circumferential spring constant of rear side spring 24, with horizontal posture in take the figure of optical axis O direction (focus direction) as the analog result of the variation at the angle of inclination (pitching) of the lens of the occasion that axially sense of rotation (circumferentially) has been rotated arbitrarily.
In each figure of Fig. 4 to Fig. 8, (A) be with solid line BTM and dot-and-dash line TOP, to represent respectively the figure of the circumferential spring constant (N/mm) of rear side spring 24 and front side spring 22, (B) be respectively and (C) in horizontal posture, to take optical axis O direction (focus direction) for axle the configuration relation of take are as shown in Figure 2 benchmark (0 degree), making progress in week to pie chart and the performance plot of the variation at the angle of inclination (pitching) of the lens subassembly of the occasion of turned clockwise lens driver 10 (portable small-sized video camera).In (C), transverse axis represents angle (degree), and the longitudinal axis represents pitching (dividing).And under the state not tilting at lens subassembly, pitching was 0 (dividing), under the state turning forward, pitching is positive value, and under sweptback state, pitching is negative value.
As shown in Fig. 4 (A), in " 0 degree configuration ", the circumferential upper spring constant of plane front side spring 22 and optical axis O quadrature is that the circumferential upper spring constant of plane peaked direction and rear side spring 24 and optical axis O quadrature is that angle between peaked direction is about 30 degree.This is because as mentioned above, in " configuration of 0 degree " (with reference to Fig. 2), each arm 226 and each arm 246 of rear side spring 24 of front side spring 22 has been disposed in circumferential offset the position of about 30 degree.In this occasion, from Fig. 4 (C), can learn, in the anglec of rotation, be the wider angular range of 0 degree～about 70 degree, about 120 degree～about 250 degree, about 300 degree～360 degree, pitching changed with interior lentamente in ± 1 (dividing).
As shown in Fig. 5 (A), in " 15 degree configurations ", the circumferential medi-spring constant of plane front side spring 22 and optical axis O quadrature is that the circumferential medi-spring constant of plane peaked direction and rear side spring 24 and optical axis O quadrature is that angle between peaked direction is about 45 degree.This is because in " configurations of 15 degree ", each arm 226 and each arm 246 of rear side spring 24 of front side spring 22 has been disposed in circumferential offset the position of about 45 degree.In this occasion, from Fig. 5 (C), can learn, in the anglec of rotation, be the angular range of 0 degree～about 60 degree, about 150 degree～about 250 degree, about 340 degree～360 degree, pitching changed with interior lentamente in ± 1 (dividing).
As shown in Fig. 6 (A), in " 30 degree configurations ", the circumferential medi-spring constant of plane front side spring 22 and optical axis O quadrature is that the circumferential medi-spring constant of plane peaked direction and rear side spring 24 and optical axis O quadrature is that angle between peaked direction is about 60 degree.This is because in " configurations of 30 degree ", each arm 226 and each arm 246 of rear side spring 24 of front side spring 22 has been disposed in circumferential offset the position of about 60 degree.In this occasion, from Fig. 6 (C), can learn, in the anglec of rotation, be only the narrower angular range of 0 degree～about 60 degree, about 175 degree～about 250 degree, about 350 degree～360 degree, pitching changed with interior lentamente in ± 1 (dividing).
As shown in Fig. 7 (A), in " 15 degree configurations ", the circumferential medi-spring constant of plane front side spring 22 and optical axis O quadrature is that the circumferential medi-spring constant of plane peaked direction and rear side spring 24 and optical axis O quadrature is that angle between peaked direction is about 15 degree.This is because in " configurations of 15 degree ", each arm 226 and each arm 246 of rear side spring 24 of front side spring 22 has been disposed in circumferential offset the position of about 15 degree.In this occasion, from Fig. 7 (C), can learn, in the anglec of rotation, be the wider angular range of 0 degree～about 75 degree, about 125 degree～about 260 degree, about 300 degree～360 degree, pitching changed with interior lentamente in ± 1 (dividing).
As shown in Fig. 8 (A), in " 30 degree configurations ", the circumferential medi-spring constant of plane front side spring 22 and optical axis O quadrature is that the circumferential medi-spring constant of plane peaked direction and rear side spring 24 and optical axis O quadrature is that angle between peaked direction is about 0 degree.This is because in " 30 degree configurations ", each arm 226 of front side spring 22 and each arm 246 of rear side spring 24 are disposed in circumferential roughly consistent position.In this occasion, from Fig. 8 (C), can learn, in the anglec of rotation, be all angular ranges, pitching changed with interior lentamente in ± 1 (dividing).
Next, the analog result that is the second occasion that front side spring 22 is 70%, rear side spring 24 is 30% to the distribution of weight of movable part 14,16 describes.
Fig. 9 to Figure 13 means that the distribution of weight at movable part 14,16 is in the second occasion, the front side spring 22 when the configuration relation of front side spring 22 and rear side spring 24 is respectively " 0 degree configuration ", " configurations of 15 degree ", " configurations of 30 degree ", " configurations of 15 degree " and " configurations of 30 degree " and the circumferential spring constant of rear side spring 24, with horizontal posture in take the figure of optical axis O direction (focus direction) as the analog result of the variation at the angle of inclination (pitching) of the lens of the occasion that axially sense of rotation (circumferentially) has been rotated arbitrarily.
In each figure of Fig. 9 to Figure 13, (A) be with solid line BTM and dot-and-dash line TOP, to represent respectively the figure of the circumferential spring constant (N/mm) of rear side spring 24 and front side spring 22, (B) be respectively and (C) in horizontal posture, take optical axis O direction (focus direction) for axle the configuration relation of take be as shown in Figure 2 benchmark (0 spends), circumferentially to pie chart and the performance plot of the variation at the angle of inclination (pitching) of the lens subassembly of the occasion of turned clockwise lens driver 10 (portable small-sized video camera).In (C), transverse axis represents angle (degree), and the longitudinal axis represents pitching (dividing).And under the state not tilting at lens subassembly, pitching was 0 (dividing), under the state turning forward, pitching is positive value, and under sweptback state, pitching is negative value.
As shown in Fig. 9 (A), in " 0 degree configuration ", the circumferential medi-spring constant of plane front side spring 22 and optical axis O quadrature is that the circumferential medi-spring constant of plane peaked direction and rear side spring 24 and optical axis O quadrature is that angle between peaked direction is about 30 degree.This is because as mentioned above, in " configuration of 0 degree " (with reference to Fig. 2), each arm 226 and each arm 246 of rear side spring 24 of front side spring 22 has been disposed in circumferential offset the position of about 30 degree.In this occasion, from Fig. 9 (C), can learn, in the anglec of rotation, be the wider angular range of 0 degree～about 75 degree, about 150 degree～about 260 degree, about 340 degree～360 degree, pitching changed with interior lentamente in ± 1 (dividing).
As shown in Figure 10 (A), in " 15 degree configurations ", the circumferential medi-spring constant of plane front side spring 22 and optical axis O quadrature is that the circumferential medi-spring constant of plane peaked direction and rear side spring 24 and optical axis O quadrature is that angle between peaked direction is about 45 degree.This is because in " configurations of 15 degree ", each arm 226 and each arm 246 of rear side spring 24 of front side spring 22 has been disposed in circumferential offset the position of about 45 degree.In this occasion, from Figure 10 (C), can learn, in the anglec of rotation, be the angular range of 0 degree～about 75 degree, about 170 degree～about 260 degree, about 350 degree～360 degree, pitching changed with interior lentamente in ± 1 (dividing).
As shown in Figure 11 (A), in " 30 degree configurations ", the circumferential medi-spring constant of plane front side spring 22 and optical axis O quadrature is that the circumferential medi-spring constant of plane peaked direction and rear side spring 24 and optical axis O quadrature is that angle between peaked direction is about 60 degree.This is because in " configurations of 30 degree ", each arm 226 and each arm 246 of rear side spring 24 of front side spring 22 has been disposed in circumferential offset the position of about 60 degree.In this occasion, from Figure 11 (C), can learn, in the anglec of rotation, be only the narrower angular range of 0 degree～about 75 degree, about 175 degree～about 260 degree, pitching changed with interior lentamente in ± 1 (dividing).
As shown in Figure 12 (A), in " 15 degree configurations ", the circumferential medi-spring constant of plane front side spring 22 and optical axis O quadrature is that the circumferential medi-spring constant of plane peaked direction and rear side spring 24 and optical axis O quadrature is that angle between peaked direction is about 15 degree.This is because in " configurations of 15 degree ", each arm 226 and each arm 246 of rear side spring 24 of front side spring 22 has been disposed in circumferential offset the position of about 15 degree.In this occasion, from Figure 12 (C), can learn, in the anglec of rotation, be the wider angular range of 0 degree～about 90 degree, about 130 degree～about 270 degree, about 320 degree～360 degree, pitching changed with interior lentamente in ± 1 (dividing).
As shown in Figure 13 (A), in " 30 degree configurations ", the circumferential medi-spring constant of plane front side spring 22 and optical axis O quadrature is that the circumferential medi-spring constant of plane peaked direction and rear side spring 24 and optical axis O quadrature is that angle between peaked direction is about 0 degree.This is because in " 30 degree configurations ", each arm 226 of front side spring 22 and each arm 246 of rear side spring 24 are disposed in circumferential roughly consistent position.In this occasion, from Figure 13 (C), can learn, in the anglec of rotation, be the angular range of the non-constant width of 0 degree～about 60 degree, about 110 degree～about 250 degree, about 290 degree～360 degree, pitching changed with interior lentamente in ± 1 (dividing).
From above content, can learn, distribution of weight at movable part 14,16 is under the first occasion and the second occasion, if the circumferential medi-spring constant of plane front side spring 22 and optical axis O quadrature is the circumferential medi-spring constant of plane peaked direction and rear side spring 24 and optical axis O quadrature be angle between peaked direction 45 degree with interior scope in, can pitching be diminished at the wider angular range of the anglec of rotation.If above-mentioned angle with interior scope, can diminish pitching at the wider angular range of the anglec of rotation at 30 degree.And, if above-mentioned angle actual be 0 degree, can at the angular range of the non-constant width of the anglec of rotation, make pitching diminish.
Above, so that the present invention to be preferred embodiment described, but without departing from the spirit of the invention within the scope, obviously can carry out various distortion by those skilled in the art.For example, in the above-described embodiment, in each leaf spring, although the arm of two is along circumferentially arranging, self-evident, be not limited thereto.
Claims (3)
1. a lens driver, can carry out position adjustment to lens subassembly at optical axis direction,
Possess: the lens mount that keeps said lens assembly;
To be positioned at the fixing annular drive coil of mode of the outside of this lens mount;
Fixed part, this fixed part comprises the permanent magnet relative with this drive coil and keeps the yoke of this permanent magnet;
Be located at the front side spring of the optical axis direction front side of said lens frame; And
Be located at the rear side spring of the optical axis direction rear side of said lens frame,
Said lens drive unit is characterised in that,
Above-mentioned front side spring and above-mentioned rear side spring comprise separately: be installed on the end, inner circumferential side on said lens frame; Be installed on the outer circumferential side end on above-mentioned fixed part; And two arms that connect the circumferential extension setting in end, above-mentioned inner circumferential side and above-mentioned outer circumferential side end and edge,
Take above-mentioned optical axis as front side benchmark, above-mentioned spring, with the spring constant making progress in week of the plane of above-mentioned light shaft positive cross be peaked direction, and take above-mentioned optical axis as rear side spring benchmark, above-mentioned, and the spring constant making progress in week of the plane of the above-mentioned light shaft positive cross angle between peaked direction in miter angle degree.
2. lens driver according to claim 1, is characterized in that,
Above-mentioned angle is in 30 degree angles.
3. lens driver according to claim 1 and 2, is characterized in that,
Above-mentioned angle is 0 degree.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010262322A JP5423989B2 (en) | 2010-11-25 | 2010-11-25 | Lens drive device |
| JP2010-262322 | 2010-11-25 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102478697A CN102478697A (en) | 2012-05-30 |
| CN102478697B true CN102478697B (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110401016.XA Active CN102478697B (en) | 2010-11-25 | 2011-11-25 | Lens drive device |
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| Country | Link |
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| JP (1) | JP5423989B2 (en) |
| CN (1) | CN102478697B (en) |
| TW (1) | TWI533045B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013183270A1 (en) * | 2012-06-07 | 2013-12-12 | 旭化成エレクトロニクス株式会社 | Position detection device |
| JP6164901B2 (en) * | 2013-04-08 | 2017-07-19 | モレックス エルエルシー | Leaf spring for lens driving device |
| US10578829B2 (en) | 2015-11-03 | 2020-03-03 | Lg Innotek Co., Ltd. | Lens driving device, camera module, and optical device |
| JP6811589B2 (en) * | 2016-11-10 | 2021-01-13 | 日本電産サンキョー株式会社 | Optical unit with runout correction function |
| CN209657057U (en) * | 2018-05-11 | 2019-11-19 | 台湾东电化股份有限公司 | Optical element driving mechanism |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101210992A (en) * | 2006-12-28 | 2008-07-02 | 日本电产三协株式会社 | Lens drive device |
| JP2010066288A (en) * | 2008-09-08 | 2010-03-25 | Nidec Sankyo Corp | Lens drive device |
| CN101750708A (en) * | 2008-12-12 | 2010-06-23 | 日本电产三协株式会社 | Lens driving device |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006058662A (en) * | 2004-08-20 | 2006-03-02 | Shicoh Eng Co Ltd | Lens driving device and compact camera |
| JP2006293244A (en) * | 2005-04-15 | 2006-10-26 | Arima Device Kk | Lens driving device |
| JP5063029B2 (en) * | 2006-04-28 | 2012-10-31 | 株式会社Ｊｖｃケンウッド | Lens drive device |
| JP2008090008A (en) * | 2006-10-02 | 2008-04-17 | Nippon Chemicon Corp | Lens driving apparatus |
| JP4838744B2 (en) * | 2006-11-08 | 2011-12-14 | 日本電産サンキョー株式会社 | Lens drive device |
| JP2009122602A (en) * | 2007-11-19 | 2009-06-04 | Konica Minolta Opto Inc | Driving device |
| JP2010217665A (en) * | 2009-03-18 | 2010-09-30 | Alps Electric Co Ltd | Lens driving device |
-
2010
- 2010-11-25 JP JP2010262322A patent/JP5423989B2/en not_active Expired - Fee Related
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2011
- 2011-11-04 TW TW100140319A patent/TWI533045B/en not_active IP Right Cessation
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101210992A (en) * | 2006-12-28 | 2008-07-02 | 日本电产三协株式会社 | Lens drive device |
| JP2010066288A (en) * | 2008-09-08 | 2010-03-25 | Nidec Sankyo Corp | Lens drive device |
| CN101750708A (en) * | 2008-12-12 | 2010-06-23 | 日本电产三协株式会社 | Lens driving device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012113141A (en) | 2012-06-14 |
| JP5423989B2 (en) | 2014-02-19 |
| CN102478697A (en) | 2012-05-30 |
| TW201229608A (en) | 2012-07-16 |
| TWI533045B (en) | 2016-05-11 |
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