CN102478698A - Spring and lens drive device - Google Patents
Spring and lens drive device Download PDFInfo
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- CN102478698A CN102478698A CN2011104010475A CN201110401047A CN102478698A CN 102478698 A CN102478698 A CN 102478698A CN 2011104010475 A CN2011104010475 A CN 2011104010475A CN 201110401047 A CN201110401047 A CN 201110401047A CN 102478698 A CN102478698 A CN 102478698A
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Abstract
Provided are a spring and a lens drive device capable of further improving shock resistance. The spring (24) of the utility model comprises: an annular internal side end portion (241), an external side end portion (242) arranged in the direction away from the internal side end portion to the radius; a plurality of arms (243, with the number of the arms being N) arranged along the circumferential direction to connect the internal side end portion and the external side end portion, a plurality of internal side connecting portions (244, with the number being N) which, arranged in the direction from internal side end portion to the outside of the radius in a protruding manner, connect the internal side end portion and the arms, and a plurality of external side connecting portions (245, with the number being N) which, arranged in the direction from the external side end portion to the radius in a protruding manner, connect the external side end portion and the arms. The internal side end portion (241) is provided with a buffer displacement portion (241a) at at least one of the adjacent internal side connecting portions (244).
Description
Technical field
The present invention relates to lens driver; Especially the both sides that relate to the optical axis direction that is located at the lens mount (movable part of column) that keeps lens subassembly (lens drum), and so that lens mount is supported and makes the lens mount can be at the leaf spring (support component of optical axis direction displacement at the state of radial location at interior fixed part with respect to comprising base component; Elastomeric element).
Background technology
Machine is equipped with portable small-sized video camera on the mobile phone of band video camera.On this portable small-sized video camera, use automatic focusing to use lens driver.All the time, propose various focusing and used lens driver.
For example, patent documentation 1 (TOHKEMY 2009-210055 communique) discloses the lens driver that has improved resistance to impact.
As the employed drive source of this lens driver (driving method), adopt the VCM mode of having used voice coil motor (VCM) usually.In the lens driver of VCM mode, use will comprise lens and support and make the movable part can be at the state of radial location with respect to fixed part at the support component (elastomeric element) of optical axis direction (central axis direction) displacement at interior column movable part (lens+lens mount).As this support component (elastomeric element), use a pair of leaf spring of the both sides of the optical axis direction that is located at the lens mount (movable part of column) that keeps lens subassembly (lens drum) usually.A pair of leaf spring is supported for lens mount (movable part of column) with can be in the optical axis direction displacement at the state of radial location with respect to the housing (fixed part of tubular) that is configured in around it.A leaf spring is called as the upside leaf spring in a pair of leaf spring, and another leaf spring is called as the downside leaf spring.
Proposition has the various leaf springs that improve resistance to impact.
For example, above-mentioned patent documentation 1 discloses the leaf spring of the cheapness that has improved resistance to impact.Leaf spring to comprise and to form circular interior all side ends (internal ring portion) and outer circumferential side end (outer portion) respectively and in order connecting in these between all side ends and outer circumferential side end and the N bar arm that axially is provided with.Each arm is along circumferentially extending.In interior all side connecting portions between all side ends and each arm be provided with to the radial direction outside is outstanding from interior all side ends.Outer circumferential side connecting portion between outer circumferential side end and each arm is side-prominent setting in radial direction from the outer circumferential side end.At least one of the plate width of interior all lateral roots portion of arm and the plate width of outer circumferential side root is wideer than the plate width of the central portion of the length direction of arm.
In addition, patent documentation 2 (TOHKEMY 2007-322540 communique) discloses and has prevented because of impacting the stress that produces, resistance to impact good camara module concentrated to the base portion (root) of the bridge part (arm) of leaf spring.
Patent documentation 2 disclosed leaf springs have outer portion, support three bridge parts (arm) of internal ring portion with respect to the internal ring portion of this outer portion displacement and with respect to outer portion.Bridge part extends along the inner peripheral of outer portion and the outer peripheral edges of internal ring portion in the gap that is formed at the ring-type between outer portion and the internal ring portion.Bridge part has as the otch that prevents the stress central authority.
And; Patent documentation 3 (TOHKEMY 2008-116622 communique) discloses following lens driver; This lens driver prevents the plastic yield of above-mentioned leaf spring through the stress of abirritation when resiliency supported keeps the impact on the leaf spring of support of lens.
Patent document 3 disclosed lens drivers possess: keep lens support, be configured in this support the outside fixed part and respectively at an upper portion thereof side be connected a pair of spring members (leaf spring) of support and fixed part with lower side.Leaf spring comprises that an end is fixed on many bar portions that the bracket side arc sections of bracket side (interior all sides are ring portion fixedly), an end are fixed on the fixed part side arc sections (outer circumferential side is ring portion fixedly) on the fixed part and connect bracket side arc sections (interior all sides are ring portion fixedly) and fixed part side arc sections (outer circumferential side is ring portion fixedly).Each bar portion comprises first arc sections, second arc sections and the bend of U word shape roughly.First arc sections in be connected in all sides fixedly interior all pleurapophysis slices of ring portion along roughly circumferentially to being connected in the fixedly outer circumferential side protrusion tab direction extension of ring portion of outer circumferential side.Second arc sections is roughly circumferentially inside all pleurapophysis slice direction extensions from outer circumferential side protrusion tab edge.Bend connects first arc sections and second arc sections, and outstanding to the support radial outside.Bend is located at for bar portion and is roughly zero position to the crooked bending moment of driving direction.
Patent documentation
Patent documentation 1: TOHKEMY 2009-210055 communique (Fig. 3)
Patent documentation 2: TOHKEMY 2007-322540 communique (Fig. 1)
Patent documentation 3: TOHKEMY 2008-116622 communique (Fig. 2)
But for the downside leaf spring, interior all side ends (internal ring portion) are fixed in the downside of resinous lens mount, and outer circumferential side end (outer portion) is held and is fixed between yoke and the base component (driver pedestal).In detail, through the be laid in support portion of lower end of resinous lens mount of hot melt, with interior all side ends (internal ring portion) fixing (support) of downside leaf spring lower end at lens mount.Therefore, apply through this hot melt, the downside leaf spring is fixed with respect to the optical axis direction that lens mount goes up and down.
But, for horizontal (radially), have gap (space) at the downside leaf spring.Therefore, the drop impact test through portable small-sized video camera between each support portion of the internal ring portion of downside leaf spring, produces the deflection that produces to its length direction at internal ring portion.Its result, the part of internal ring portion is interfered with the base component that is configured in the position relative with the downside leaf spring (driver pedestal) to the direction distortion that the lower end from lens mount rises.Therefore, might produce the undesirable condition of the posture of lens mount with respect to the fixed part inclination that comprises base component (driver pedestal).
In addition,, the unfavorable condition of the characteristic variation of lens driver might be produced,, the undesirable condition of laying dust might be produced because the downside leaf spring contacts with base component because the posture of lens mount tilts.
In above-mentioned patent documentation 1～3, be not familiar with (record) above-mentioned undesirable condition fully, do not implement any countermeasure that prevents above-mentioned undesirable condition at above-mentioned patent documentation 1～3 disclosed leaf spring.
Summary of the invention
Problem of the present invention provides the leaf spring and the lens driver of further raising resistance to impact.
Another problem of the present invention provide can the rejection characteristic deterioration lens driver.
Other problems of the present invention provide the lens driver that can prevent laying dust.
According to first scheme of the present invention; Can access following leaf spring 24; The movable part 14,16 of the column that is configured in central portion is supported with respect to the fixed part that is configured in this movable part outside 12,18,20,28 states in radial location and makes it can be in the displacement of central shaft O direction; This leaf spring 24 is characterised in that to have: circular interior all side ends 241; All side ends to the outer circumferential side end 242 of setting, the radial direction outside with leaving in this; For between all side ends in connecting and the outer circumferential side end and the arm 243 of the N bar (N is the integer more than 2) that is provided with along Zhou Fangxiang; Be provided with to the radial direction outside is outstanding from interior all side ends, and in connecting all side ends with the N of N bar arm individual in all side connecting portions 244; And the side-prominent setting in radial direction from the outer circumferential side end, and N outer circumferential side connecting portion 245 of connection outer circumferential side end and N bar arm, at least one place of interior all side ends 241 between interior all side connecting portions 244 of adjacency has the 241a of buffer displacement portion.
In the leaf spring 24 of first scheme of the invention described above, interior all side connecting portions 244 preferably have the opening 244a that is used for interior all side ends 241 are installed on movable part 14,16.The 241a of buffer displacement portion is preferably from for example roughly any selection the shape of U word shape, Ω shape, S word shape.The material of leaf spring 24 preferably is made up of high-hardness stainless steel.
According to alternative plan of the present invention, can access following lens driver 10, it possesses: the lens mount 14 with the cylindrical portion 140 that is used to keep lens subassembly; Be configured in the fixed part 12,18,20,28 of this lens mount outside; With lens mount and the fixed part upside leaf spring 22 that is connected of side at an upper portion thereof; And the downside leaf spring 24 that lens mount and fixed part are connected in lower side, said lens drive unit 10 is characterised in that downside leaf spring 24 has: be fixed in all side ends 241 in the circular downside of lower end of lens mount; Be fixed in fixed part and in this downside all side ends to the radial direction outside lower outer periphery side end 242 of setting with leaving; In order to connect in the downside between all side ends and lower outer periphery side end and along N bar (N is the integer more than 2) the downside arm 243 that circumferentially is provided with; All side ends are provided with to the radial direction outside is outstanding in the downside, and connect all side connecting portions 244 in N the downside of all side ends and N bar downside arm in the downside; And from the side-prominent setting in radial direction of lower outer periphery side end; And N lower outer periphery side connecting portion 245 of connection lower outer periphery side end and N bar downside arm, all side ends 241 at least one place between all side connecting portions 244 in the downside of adjacency has the 241a of buffer displacement portion in the downside.
In the lens driver 10 of the alternative plan of the invention described above, lens mount 14 is N support portion 144 of all side ends in its lower end has the downside that is used to support the downside leaf spring preferably.In this case, all side connecting portions 244 have the opening 244a that all side ends in the downside are installed in N the support portion that is used to utilize lens mount in N downside.The 241a of buffer displacement portion is preferably from for example roughly any selection the shape of U word shape, Ω shape, S word shape.Upside leaf spring 22 has: be fixed in all side ends 221 in the circular upside of upper end of lens mount 14; Be fixed in fixed part and in this upside all side ends to the upside outer circumferential side end 222 of setting, the radial direction outside with leaving; In order to connect in the upside between all side ends and upside outer circumferential side end and along N bar (N is the integer more than 2) the upside arm 223 that circumferentially is provided with; All side ends are provided with to the radial direction outside is outstanding in the upside, and connect all side connecting portions 224 in N the upside of all side ends and N bar upside arm in the upside; And side-prominent setting in radial direction from upside outer circumferential side end; And connecting N upside outer circumferential side connecting portion 225 of upside outer circumferential side end and N bar upside arm, N upside outer circumferential side connecting portion 225 preferably has from upside outer circumferential side end 222 shape to the root bending of N bar upside arm 223.The material of downside leaf spring 24 and upside leaf spring 22 preferably is made up of high-hardness stainless steel.
And above-mentioned reference marker marks for easy to understand, and just an example does not schedule this certainly at present.
Effect of the present invention is following.
In the present invention, owing to the interior all side ends at leaf spring, at least one place between interior all side connecting portions of adjacency is provided with buffer displacement portion, therefore, and all side ends and arm distortion in can preventing.
Description of drawings
Fig. 1 is the figure of the lens driver of expression an embodiment of the invention, (A) is the vertical view of lens driver, (B) is the front view of lens driver, (C) is the right side view of lens driver.
Fig. 2 is the exploded perspective view of lens driver shown in Figure 1.
Fig. 3 is the vertical view of the downside leaf spring of an embodiment of the invention.
Fig. 4 is the local amplification plan view that amplifies the major part of expression downside leaf spring shown in Figure 3.
Fig. 5 is the stereographic map of the state of the expression lower end side that all side ends in the downside of the downside leaf spring of association is installed in lens mount.
Fig. 6 is the figure of the variation of expression buffer displacement portion shown in Figure 4.
Fig. 7 is the vertical view of the upside leaf spring of an embodiment of the invention.
Among the figure:
The 10-lens driver, 12-base component (driver pedestal), 12a-circular open portion, 120-base portion, 122-teat, 124-teat; The 124-1-jut, 124-1a-leading section, 124-1b-lower end, 14-lens mount, 140-cylindrical portion, 140-1-contact site; The 142-female screw, 144-support portion, 16-drive coil, 162-par, 18-permanent magnet; The permanent magnet pieces of 182-section triangle, the rectangular-shaped permanent magnet pieces in 184-cross section, 20-yoke, 202-urceolus portion (shielding yoke (シ one Le De ヨ one Network)), 202-1-middle body; The 204-annular end, 204a-embedded hole, the inboard vertical stretch of 206-(back of the body yoke (バ Star Network ヨ one Network)), 22-upside leaf spring (front side spring), all side ends (internal ring portion) in the 221-upside; 222-upside outer circumferential side end (outer portion), 222a-through hole, 223-upside arm, all side connecting portions in the 224-upside, 225-upside outer circumferential side connecting portion; 24-downside leaf spring (rear side spring), all side ends (internal ring portion) in the 241-downside, 241a-buffer displacement portion, 242-lower outer periphery side end (outer portion), 242a-through hole; 243-downside arm, all side connecting portions in the 244-downside, 244a-opening, 245-lower outer periphery side connecting portion, 26-limiter; The 28-cover, 28a-circular open portion, 282-projection, 30-liner, 30a-embedded hole; The 32-power supply part, 322-flexible printed-circuit board, 324-panel beating terminal, 34-annular plate, O-optical axis (central shaft).
Embodiment
Below, with reference to description of drawings embodiment of the present invention.
With reference to Fig. 1 and Fig. 2, the lens driver 10 of an embodiment of the invention is described.Fig. 1 (A) is the vertical view of lens driver 10, and Fig. 1 (B) is the front view of lens driver 10, and Fig. 1 (C) is the right side view of lens driver 10.Fig. 2 is the exploded perspective view of lens driver 10.
At this, like Fig. 1 and shown in Figure 2, the use rectangular coordinate system (X, Y, Z).Under Fig. 1 and state shown in Figure 2, rectangular coordinate system (X, Y, Z) in, the X axle is fore-and-aft direction (depth direction), the Y axle is left and right directions (Width), the Z axle is above-below direction (short transverse).And in Fig. 1 and example shown in Figure 2, above-below direction Z is the optical axis O direction of lens.
But, in the behaviour in service of reality, optical axis O direction, be that Z-direction becomes fore-and-aft direction.In other words, the last direction of Z axle become the place ahead to, the lower direction of Z axle become the rear to.
Illustrated lens driver 10 is the lens drivers that adopt the VCM mode of voice coil motor (VCM) as drive source (driving method).
But illustrated lens 10 are provided on the pocket telephone of the video camera that has automatic focusing.Lens driver 10 is devices that lens subassembly (lens drum) (not shown) is moved to optical axis O direction.Therefore, optical axis O is driving shaft (central shaft).Lens driver 10 also is called as driver.Lens driver 10 has the base component (driver pedestal) 12 of the downside (rear side) of Z-direction of being configured in (optical axis O direction).Bottom (rear portion) at this base component (driver pedestal) 12 disposes sensor base plate (not shown).Sensor base plate carries the electronic unit in imaging apparatus or clock generation source etc.Lens driver 10 and sensor base plate conductively-closed housing (not shown) cover.Shield shell is used to shield the electromagnetic interference (EMI) that produces from sensor base plate.
Constitute photographing module through assembling lens driving device 10, sensor base plate, imaging apparatus and shield shell.
Imaging apparatus is to being made a video recording by subject image and convert electric signal into by lens subassembly imaging.Imaging apparatus is for example by formations such as CCD (charge coupled device) type imageing sensor, CMOS (complementary metal oxide semiconductor) type imageing sensors.
In addition, as stated, in actual behaviour in service, the last direction of Z-direction (optical axis O direction) become the place ahead to, the lower direction of Z-direction (optical axis O direction) become the 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 for example formed by metallic such as stainless steel or beryllium-bronzes.And upside leaf spring (front side spring) 22 and downside leaf spring (rear side spring) 24 carry out punch process, have perhaps utilized the etching and processing of photoetching technique to make through the thin plate to regulation.And etching and processing is more better than punching press processing.Its reason is in etching and processing, can not stay residual stress at leaf spring.
In addition, as the material of leaf spring,, preferably use stainless steel, especially high-hardness stainless steel than beryllium-bronze.Its reason is, and is well-known, the strong toxicity of the compound of beryllium, and the viewpoint from the environment is preferably used the material (not containing beryllium) beyond the beryllium-bronze as the material of leaf spring.And,, for example, can use the NTK S-4 or the NTK 301 (SUS301) of Nippon Metal Ind's system as high-hardness stainless steel.
Yoke 20 is the quadrangular barrel shape.That is, yoke 20 comprises: the urceolus portion 202 of quadrangular barrel shape roughly; The tetragonal annular end 204 that prolongs to the inboard of urceolus portion 202 in the upper end of this urceolus portion 202 (front end); And two inboard vertical stretches 206 that extend to vertical lower abreast at the relative two ends of fore-and-aft direction X and optical axis O in the inboard of this annular end 204.Urceolus portion 202 is called as the shielding yoke, and each of two inboard vertical stretches 206 is called as back of the body yoke.With regard to 202, outstanding to the outside of radial direction with regard to urceolus portion (shielding yoke) at the middle body 201-1 of the relative opposite side of left and right directions Y.
Therefore, drive coil 16 also is the consistent roughly quadrangular barrel shape of shape with the yoke 20 of quadrangular barrel shape.The cylindrical portion 140 of lens mount 14 has in the position corresponding with the left and right directions Y of drive coil 16 to two outstanding contact site 140-1 of the radial direction outside.Two pars 162 at these two bonding drive coils 16 of contact site 140-1.That is, drive coil 16 at two contact site 140-1 of cylindrical portion 140 by bonding.
On the other hand, permanent magnet 18 comprises: four permanent magnet pieces 182 and two the cross sections rectangular-shaped permanent magnet pieces 184 relative with above-mentioned two pars of drive coil 16 162 that are configured in four jiaos section triangle of yoke 20.In detail, two rectangular-shaped permanent magnet pieces 184 in cross section are installed in the inwall of middle body 202-1 of an above-mentioned opposite side of the urceolus portion 202 of yoke 20.That is, permanent magnet 18 by four jiaos of the urceolus portion 202 of the quadrangular barrel shape that is configured in yoke 20 with dual-side, totally six permanent magnet pieces 182,184 constitute.
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 upside (front side) of the optical axis O direction of lens mount 14, and downside leaf spring (rear side spring) 24 is configured in the downside (rear side) of the optical axis O direction of lens mount 14.Upside leaf spring (front side spring) 22 becomes roughly the same structure with downside leaf spring (rear side spring) 24.
Upside leaf spring (front side spring) 22 has like all side ends 221 in the upside of the said upper end that is installed on lens mount 14, back and like the said upside outer circumferential side end 222 that is installed on the annular end 204 of yoke 20, back.In upside, be provided with four upside arms 223 between all side ends 221 and the upside outer circumferential side end 222.Each upside arm 223 connects all side ends 221 and upside outer circumferential side end 222 in the upside.
Likewise, downside leaf spring (rear side spring) 24 has like all side ends 241 in the downside of the said lower end that is installed on lens mount 14, back and like the said lower outer periphery side end 242 that is installed on the driver pedestal (base component) 12 in back.In downside, be provided with four downside arms 243 between all side ends 241 and the lower outer periphery side end 242.Each downside arm 243 connects all side ends 241 and lower outer periphery side end 242 in the downside.
And interior all side ends 222,242 also are called as internal ring portion (internal ring portion), and outer circumferential side end 224,244 also is called as outer portion (outer portion).
In addition, the detailed structure (structure) for upside leaf spring (front side spring) 22 describes with reference to Fig. 7 in the back, and the structure at length (structure) for downside leaf spring (rear side spring) 24 describes with reference to Fig. 3 and Fig. 4 in the back.
Next, the installation method to upside leaf spring (front side spring) 22 describes.
All side ends 221 are fixed with limiter 26 clampings by lens mount 14 in the upside of upside leaf spring (front side spring) 22.In other words, limiter 26 with and the upper end of lens mount 14 between in the upside of clamping upside leaf spring (front side spring) 22 mode and the lens mount 14 of all side ends 221 chimeric.
The function of stating after limiter 26 has.That is, limiter 26 has all side end 221 bias frees in the upside that makes upside leaf spring (front side spring) 22, is adjacent to function on the lens mount 14 accurately.Thus, can improve the deviation of VCM (voice coil motor) characteristic.In addition, limiter 26 has the function of the bonding strength that improves upside leaf spring (front side spring) 22.Thus, improve the resistance to impact of lens mount drive unit 10.And, the function of the distortion of the upside leaf spring when limiter 26 has the drop impact that prevents lens driver 10 (front side spring) 22.Thus, also improve the resistance to impact of lens driver 10.In addition, limiter 26 has the function of the mechanical trip of decision lens driver 10.
On the other hand, the upside outer circumferential side end 222 of upside leaf spring (front side spring) 22 be clamped in yoke 20 annular end 204 and the cover 28 between and fix.In detail, cover 28 has the 28a of circular open portion at central portion, is four side ring shapes.Cover 28 has four outstanding projections 282 downwards at Qi Sijiao.The upside outer circumferential side end 222 of upside leaf spring 22 has four through hole 222a that these four projections 282 connect.And the annular end 204 of yoke 20 has four embedded hole 204a that embed four projections 282 at Qi Sijiao.Therefore, four projections 282 of cover 28 are embedded into four embedded hole 204a of the annular end 204 of yoke 20 through four through hole 222a of the upside outer circumferential side end 222 of upside leaf spring 22.
And, between the upside outer circumferential side end 222 of upside leaf spring 22 and cover 28, dispose the annular plate 34 that is used to adjust spring constant.
Next, the installation method to downside leaf spring (rear side spring) 24 describes.
The lower outer periphery side end 242 of downside leaf spring (rear side spring) 24 is fixed in yoke 20 through ring-type liner 30.In other words, the lower outer periphery side end 242 of liner 30 and downside leaf spring (rear side spring) 24 is clamped in yoke 20 and base component (driver pedestal) between 12 and fix.In detail, base component (driver pedestal) 12 has the 12a of circular open portion at central portion, is four side ring shapes.Base component (driver pedestal) 12 Qi Sijiao have to above four outstanding projections 122.The lower outer periphery side end 242 of downside leaf spring 24 has four through hole 242a that these four projections 122 connect.Liner 30 has the embedded hole 130a that these four projections 122 embed.Therefore, four projections 122 of base component (driver pedestal) 12 are embedded into four embedded hole 30a of liner 30 through four through hole 242a of the lower outer periphery side end 242 of downside leaf spring 24.
As the back with reference to Fig. 5 illustrated, in the downside of downside leaf spring (rear side spring) 24 all side end 241 fixing (support) in the lower end (rear end) of lens mount 14 side.
The bottom of lens mount 14 embeds the 12a of circular open portion of base component (driver pedestal) 12 with a gap.In other words, the bottom of lens mount 14 and base component (driver pedestal) 12 has with gap at the 12a of its circular open portion and faces.
Base component (driver pedestal) 12 is equipped with not shown cutoff filter (IR cut filter).Base component (driver pedestal) 12 is made through injection molding forming.The material of base component (driver pedestal) 12 for example is made up of the engineering plastics of liquid crystal polymer (LCP) etc.As as everyone knows, LCP is the less resin of elasticity.
Base component (driver pedestal) 12 has: the base portion 120 of ring-type; And with the mode of the middle body 202-1 of the above-mentioned opposite side of the urceolus portion 202 that clips yoke 20, at left and right directions Y relatively at four jiaos from base portion 120 outstanding four teats 124 above above-below direction Z.
Four teats 124 have four jiaos the jut 124-1 that is formed at base component (driver pedestal) 12.Each jut 124-1 be above-below direction Z extend roughly cylindric.In illustrated example, the diameter of each jut 124-1 is about 0.1mm.Each jut 124-1 has roughly cone shape leading section 124-1a at an upper portion thereof.In addition, the lower end 124-1b of each jut 124-1 is positioned at by top than the substrate bearing surface of base component (driver pedestal) 12.
Cut at the internal perisporium of the cylindrical portion 140 of lens mount 14 and to be provided with female screw 142.On the other hand, though not shown, cut at the periphery wall of lens subassembly (lens drum) and to be provided with the pin thread that combines with above-mentioned female screw 142 screw threads.Therefore; With lens subassembly (lens drum) when being installed on lens mount 14; Through lens subassembly (lens drum) is carried out the screw thread combination with respect to the cylindrical portion 140 of lens mount 14 around optical axis O rotation and along optical axis O direction; Thereby lens subassembly (lens drum) is received in the lens mount 14, utilizes bonding agent etc. bonding each other.
Through utilizing power supply part 32, thereby utilize the interaction in magnetic field with the magnetic field that produces by the electric current that is flowing in drive coil 16 of permanent magnet 18 to drive coil 16 energising, can be in optical axis O direction to lens mount 14 (lens subassembly) adjustment position.
At said lens drive unit 10, keep the lens mount 14 of lens subassembly and the combination of drive coil 16 to work as the movable part 14,16 of the column that is configured in central portion.In addition, base component (driver pedestal) 12, permanent magnet 18, yoke 20 and cover 28 combination fixed part 12,18,20,28 work as the outside that is configured in movable part 14,16.
Next, with reference to Fig. 3 and Fig. 4, specify the structure of the downside leaf spring 24 of an embodiment of the invention.Fig. 3 is the vertical view of downside leaf spring 24, and Fig. 4 is the major part amplification plan view that amplifies the major part of expression downside leaf spring 24.
Downside leaf spring (rear side spring) 24 has: like all side ends 241 in the downside of the said lower end of being fixed in lens mount 14, back; Be fixed in the lower outer periphery side end 242 of base component (driver base component) 12 as stated as fixed part; And in order to connect in the downside between all side ends 241 and lower outer periphery side end 242 and along four downside arms 243 that circumferentially are provided with.In fact all side ends 241 are circular in the downside.Lower outer periphery side end 242 in this downside all side ends 241 to the setting of the radial direction outside with leaving.In other words, lower outer periphery side end 242 has the radius bigger than all side end in the downside 241.Each downside arm 243 is along circumferentially extending.Connecting in four downsides of all side ends 241 and downside arm 243 in the downside all side connecting portions 244 all side ends 241 in the downside is provided with to the radial direction outside is outstanding.Four lower outer periphery side connecting portions 245 that connect lower outer periphery side end 242 and four downside arms 243 are from lower outer periphery side end 242 side-prominent setting in radial direction.
As shown in Figure 5, four support portions 144 of lens mount 14 all side ends 241 in its lower end has the downside that is used to support downside leaf spring 24.
All side connecting portions 244 have the opening 244a that is used for installing with four support portions 144 of lens mount 14 all side ends 241 in the downside in four downsides.
In the downside leaf spring 24 of this embodiment, all side ends 241 place between all side connecting portions 244 in the downside of adjacency has the 241a of buffer displacement portion in the downside.
As shown in Figure 4, the illustrated buffer displacement 241a of portion is the Ω shape.
With respect to this, there is not the 241a of buffer displacement portion at the downside leaf spring 24 ' (with reference to Fig. 5) of association.Therefore, at the downside leaf spring 24 ' of association, all side ends 241 can distortion with downside arm 243 in the downside in the shatter test of portable small-sized video camera.Therefore the downside leaf spring 24 of this embodiment can prevent all side ends 241 and 243 distortion of downside arm in the downside owing to have four 241a of buffer displacement portion in the shatter test of portable small-sized video camera.
Next, in order further to understand the effect of the downside leaf spring 24 of first embodiment of the present invention,, the problem points of related downside leaf spring 24 ' is described with reference to Fig. 5.Fig. 3 is the stereographic map of the state of the expression lower end side that all side ends 242 in the downside of the downside leaf spring 24 ' of association is installed on lens mount 13.
Related downside leaf spring 24 ' has the structure same with downside leaf spring shown in Figure 3 24 except not having the 241a of buffer displacement portion.
All side ends 241 are like the said lower end of being fixed in lens mount 14, back in the downside of related downside leaf spring 24 '.At first, four support portions 144 with the lower end that is located at lens mount 14 are embedded into the opening 244a that is located at all side connecting portions 244 in four downsides.Afterwards, hot melt applies four support portions 144.Thus, all side ends 241 are fixed in the lower end of lens mount 14 in the downside of related downside leaf spring 24 '.
Therefore, apply through this hot melt, related downside leaf spring 24 ' is fixed with respect to the optical axis O direction that lens mount 14 goes up and down.
But,, have gap (play) at the downside leaf spring 24 ' of association in laterally (radially).Drop impact test through portable small-sized video camera has been applied in the impact of the direction shown in the arrow A of Fig. 5 at lens mount 14.Impact for this, the support portion 144 of downside arm 243 all side ends (internal ring portion) 241 in the downside of the downside leaf spring 24 ' of association is stretched to the direction shown in the arrow B of Fig. 5.Therefore, all side ends (internal ring portion) 241 produce crooked to its length direction in downside.Its direction distortion that part of all side ends (internal ring portion) 241 rises to the lower end from lens mount 14 shown in the arrow C of Fig. 5 in downside as a result, and interfere with being disposed at downside leaf spring 24 ' relative locational base component (driver pedestal) 12.The posture that thus, lens mount 14 might take place is with respect to comprising the undesirable condition that base component (driver pedestal) 12 tilts at interior fixed part.
In addition, because the posture of lens mount 14 tilts, might have the undesirable condition of deterioration in characteristics of the lens driver of related downside leaf spring 24 ', or, might produce the undesirable condition of laying dust because downside leaf spring 24 ' contacts with base component 12.
To this, in the downside leaf spring 24 of this embodiment, all side ends (internal ring portion) 241 in downside, the place in the downside of adjacency between all side connecting portions 244 is provided with the 241a of buffer displacement portion (therefore, totally four 241a of buffer displacement portion).Inventor of the present invention has confirmed all side ends (internal ring portion) 241 undeformed situation in the downside in the shatter test of portable small-sized video camera.Therefore, can prevent that all side ends (internal ring portion) 241 contacts with base component (driver pedestal) 12 in the downside.Its result can improve the deterioration in characteristics of lens driver, also can prevent laying dust.
And; As shown in Figure 3; The downside leaf spring 24 of above-mentioned embodiment is all side ends (internal ring portion) 241 in downside; Only the place between all side connecting portions 244 is provided with the 241a of buffer displacement portion (under this routine situation, four 241a of buffer displacement portion) in the downside of adjacency, but also can in the downside of adjacency, the 241a of buffer displacement portion be set the many places between all side connecting portions 244.For example, two places in the downside of adjacency between all side connecting portions 244 are provided with under the situation of the 241a of buffer displacement portion, and it is eight that the 241a of buffer displacement portion adds up to.
In addition, the shape of the 241a of buffer displacement portion also is not limited to the shape of Ω shape as shown in Figure 4 certainly.That is, if the indeformable shape of buffer displacement portion itself gets final product.
Variation at Fig. 6 (A)～(L) expression buffer displacement 241a of portion.For example, at Fig. 6 (A), (E) and the 241a of buffer displacement portion (I) become the roughly shape of U word shape.In addition, the 241a of buffer displacement portion shown in Fig. 6 (C) reaches (D) becomes the shape of S word shape.The 241a of buffer displacement portion shown in Fig. 6 (H) becomes the shape of V word shape, and the 241a of buffer displacement portion shown in Fig. 6 (K) becomes the shape of W word shape.The 241a of buffer displacement portion shown in Fig. 6 (B) becomes curved shape.The 241a of buffer displacement portion shown in Fig. 6 (F) becomes the shape of rhombus, and the 241a of buffer displacement portion shown in Fig. 6 (G) becomes leg-of-mutton shape, and the 241a of buffer displacement portion shown in Fig. 6 (J) becomes the shape of ring (annulus).The 241a of buffer displacement portion shown in Fig. 6 (L) becomes the shape of hollow V word shape.
Next, specify the structure of the upside leaf spring 22 of an embodiment with reference to Fig. 7.Fig. 7 is the vertical view of upside leaf spring 22.
Upside leaf spring (front side spring) 22 has: be fixed in all side ends 221 in the upside of upper end of lens mount 14 as stated; Be fixed in upside outer circumferential side end 222 as stated as the fixed part of yoke 20; And in order to connect in the upside between all side ends 221 and upside outer circumferential side end 222 and along four upside arms 223 that circumferentially are provided with.In fact all side ends 221 become circular in the upside.Upside outer circumferential side end 222 in the upside all side ends 221 to the setting of the radial direction outside with leaving.That is, upside outer circumferential side end 222 has the radius bigger than all side end in the upside 221.Each arm 223 is outstanding along circumferentially.Connect in four upsides of all side ends 221 and four upside arms 223 in the upside all side connecting portions 224 in the upside all side ends 221 to the outstanding setting in the radial direction outside.Connect four upside outer circumferential side connecting portions 225 side-prominent setting in radial direction of upside outer circumferential side end 222 and four upside arms 223 from upside outer circumferential side end 222.
In the upside leaf spring 22 of this embodiment, four upside outer circumferential side connecting portions 225 have the shape to the root bending of four upside arms 224 from upside outer circumferential side end 222.
The upside leaf spring 22 of this embodiment is owing to have the upside outer circumferential side connecting portion 225 of curved shape; Therefore can be released in the stress that produces in the drop impact test of portable small-sized video camera; Specifically, can disperse to concentrate on the stress of the root of upside arm 224.In other words, can alleviate the root that bending stress concentrates on upside arm 223.
As stated, according to this embodiment, can further improve the resistance to impact of upside leaf spring 22 and downside leaf spring 24 and lens driver 10.
More than, utilize preferred implementation that the present invention has been described, but in the scope that does not break away from spirit of the present invention, those skilled in the art can carry out various distortion.For example; In the above-described embodiment; All side ends 221,241 and outer circumferential side end 222 in connecting with four arms 223,243, between 242; In general, also go for utilizing the arm of N bar (N is the integer more than 2) connect in all side ends 221,241 and outer circumferential side end 222, the leaf spring between 242.
Claims (9)
1. leaf spring supports with respect to the fixed part that is configured in this movable part outside the column movable part that is configured in central portion and makes the above-mentioned movable part can be in the central axis direction displacement under the state of radial location, above-mentioned leaf spring is characterised in that,
Have: circular interior all side ends;
All side ends to the outer circumferential side end of setting, the radial direction outside with leaving in this;
For connect above-mentioned between all side ends and the above-mentioned outer circumferential side end and along the N bar arm that circumferentially is provided with;
All side ends are provided with to the radial direction outside is outstanding in above-mentioned, and connect above-mentioned in all side ends with the N of above-mentioned N bar arm individual in all side connecting portions; And
The side-prominent setting in radial direction from above-mentioned outer circumferential side end, and connect N outer circumferential side connecting portion of above-mentioned outer circumferential side end and above-mentioned N bar arm,
Wherein N is the integer more than 2,
All side ends at least one place between all side connecting portions in adjacency above-mentioned has buffer displacement portion in above-mentioned.
2. leaf spring according to claim 1 is characterized in that,
All side connecting portions have and are used for all side ends in above-mentioned are installed in the opening on the above-mentioned movable part in above-mentioned.
3. leaf spring according to claim 1 is characterized in that,
Any selection from the shape of roughly U word shape, Q shape, S word shape of above-mentioned buffer displacement portion.
4. according to each described leaf spring in the claim 1 to 3, it is characterized in that,
The material of above-mentioned leaf spring is made up of high-hardness stainless steel.
5. lens driver possesses: the lens mount with the cylindrical portion that is used to keep lens subassembly; Be configured in the fixed part of this lens mount outside; With said lens frame and the said fixing portion upside leaf spring that is connected of side at an upper portion thereof; And with said lens frame and the said fixing portion downside leaf spring that side is connected in its underpart, the said lens drive unit is characterised in that,
Above-mentioned downside leaf spring has:
Be fixed in all side ends in the circular downside of lower end of said lens frame;
Be fixed in said fixing portion, and in this downside all side ends to the radial direction outside lower outer periphery side end of setting with leaving;
In order to connect in the above-mentioned downside between all side ends and above-mentioned lower outer periphery side end and along the N bar downside arm that circumferentially is provided with;
All side ends are provided with to the radial direction outside is outstanding in the above-mentioned downside, and connect all side connecting portions in N the downside of all side ends and above-mentioned N bar downside arm in the above-mentioned downside; And
From the side-prominent setting in radial direction of above-mentioned lower outer periphery side end, and connect N lower outer periphery side connecting portion of above-mentioned lower outer periphery side end and above-mentioned N bar downside arm,
Wherein N is the integer more than 2,
All side ends at least one place between all side connecting portions in the above-mentioned downside of adjacency has buffer displacement portion in the above-mentioned downside.
6. lens driver according to claim 5 is characterized in that,
N support portion of said lens frame all side ends in its lower end has the downside that is used to support above-mentioned downside leaf spring,
All side connecting portions have the opening that all side ends in the above-mentioned downside are installed in above-mentioned N the support portion that is used to utilize the said lens frame in the above-mentioned N downside.
7. lens driver according to claim 5 is characterized in that,
Any selection from the shape of roughly U word shape, Ω shape, S word shape of above-mentioned buffer displacement portion.
8. according to each described lens driver in the claim 5 to 7, it is characterized in that,
Above-mentioned upside leaf spring has:
Be fixed in all side ends in the circular upside of upper end of said lens frame;
Be fixed in said fixing portion, and in this upside all side ends to the upside outer circumferential side end of setting, the radial direction outside with leaving;
In order to connect in the above-mentioned upside between all side ends and above-mentioned upside outer circumferential side end and along the N bar upside arm that circumferentially is provided with;
All side ends are provided with to the radial direction outside is outstanding in the above-mentioned upside, and connect all side connecting portions in N the upside of all side ends and above-mentioned N bar upside arm in the above-mentioned upside; And
From the side-prominent setting in radial direction of above-mentioned upside outer circumferential side end, and connect N upside outer circumferential side connecting portion of above-mentioned upside outer circumferential side end and above-mentioned N bar upside arm,
Above-mentioned N upside outer circumferential side connecting portion has the shape to the root bending of above-mentioned N bar upside arm from above-mentioned upside outer circumferential side end
Wherein N is the integer more than 2.
9. according to each described lens driver in the claim 5 to 8, it is characterized in that,
The material of above-mentioned downside leaf spring and above-mentioned upside leaf spring is made up of high-hardness stainless steel.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-263602 | 2010-11-26 | ||
| JP2010263602A JP5333790B2 (en) | 2010-11-26 | 2010-11-26 | Lens drive device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102478698A true CN102478698A (en) | 2012-05-30 |
| CN102478698B CN102478698B (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110401047.5A Active CN102478698B (en) | 2010-11-26 | 2011-11-25 | Lens drive device |
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| Country | Link |
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| JP (1) | JP5333790B2 (en) |
| CN (1) | CN102478698B (en) |
| TW (1) | TWI564490B (en) |
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| CN104884988A (en) * | 2012-12-26 | 2015-09-02 | 夏普株式会社 | Lens drive apparatus |
| CN106772902A (en) * | 2017-01-10 | 2017-05-31 | 惠州大亚湾三美达光学技术有限公司 | Lens driver |
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| JP6086290B2 (en) * | 2012-09-20 | 2017-03-01 | 大日本印刷株式会社 | Leaf spring, camera module drive mechanism and electronic device terminal |
| JP5963641B2 (en) * | 2012-10-26 | 2016-08-03 | アルプス電気株式会社 | Lens drive device |
| JP6185334B2 (en) * | 2013-08-20 | 2017-08-23 | 惠州市大亜湾永昶電子工業有限公司 | Lens drive device |
| KR101983169B1 (en) | 2014-04-18 | 2019-05-28 | 삼성전기주식회사 | Lens module, manufacturing method thereof and camera module including the same |
| TWI515502B (en) * | 2014-12-26 | 2016-01-01 | 台灣東電化股份有限公司 | Lens driving module and spring thereof |
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| CN112114468A (en) * | 2015-01-20 | 2020-12-22 | Lg伊诺特有限公司 | Lens driving device, camera module and optical apparatus |
| CN112114468B (en) * | 2015-01-20 | 2022-05-27 | Lg伊诺特有限公司 | Lens driving device, camera module and optical apparatus |
| US11740427B2 (en) | 2015-01-20 | 2023-08-29 | Lg Innotek Co., Ltd. | Lens driving device, camera module and optical apparatus |
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| CN106772902A (en) * | 2017-01-10 | 2017-05-31 | 惠州大亚湾三美达光学技术有限公司 | Lens driver |
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| CN111140654A (en) * | 2019-11-18 | 2020-05-12 | 上海厚酷科技有限公司 | Gas distribution piston of refrigerator |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI564490B (en) | 2017-01-01 |
| JP5333790B2 (en) | 2013-11-06 |
| TW201221797A (en) | 2012-06-01 |
| CN102478698B (en) | 2014-07-30 |
| JP2012112489A (en) | 2012-06-14 |
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