CN1465996A - Lens driving device - Google Patents
Lens driving device Download PDFInfo
- Publication number
- CN1465996A CN1465996A CNA021123977A CN02112397A CN1465996A CN 1465996 A CN1465996 A CN 1465996A CN A021123977 A CNA021123977 A CN A021123977A CN 02112397 A CN02112397 A CN 02112397A CN 1465996 A CN1465996 A CN 1465996A
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- China
- Prior art keywords
- lens driver
- lens
- magnetite
- spring
- supporting frame
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Abstract
The invention provides a compact, small-sized and light lens drive device, and the lens will not sway in the radial direction. The lens drive device makes the lens move to one position by electrifying a coil, and the spring's acting force in the position and the magnetic field's acting force which are received by the lens are equal.
Description
Technical field
The present invention relates to a kind of lens driver, the particularly a kind of lens driver that can catch and amplify object rapidly that is used on the portable type miniature camera.
Background technology
As everyone knows, lens driver is generally combined by step motor and feed screw gear train.Fig. 7 shows the typical structure of this drive unit.As shown in Figure 7, in lens driver 100, the roller end of step motor 101 is inserted the gearing mesh of gear 102 backs and feed screw 103 ends, therefore not only the circular motion of motor 101 rotating shafts is transformed to the rectilinear motion of feed screw 103, and lens 105 are fixed on the nut 104 of guiding driving feed screw 103, therefore, the rotational angle of step motor has determined the position of lens 105.
But, said lens drive unit 100 comprises complicated gear train such as step motor 101, gear 102, feed screw 103 and nut 104, bulky, thus and can produce diametrically during lens 105 moving linearlies of this device to rock and cause the lens enlarged image fuzzy.
Summary of the invention
Therefore target of the present invention provides a kind of compact conformation, small portable and lens and can not produce the lens driver that rocks diametrically.
According to lens driver of the present invention, comprise:
By the preceding supporting frame of front lens, supporting front lens with the front lens driver element that the preceding coil on the supporting frame is formed before being installed on;
By the back supporting frame of rear lens, supporting rear lens be installed on the rear lens driver element that the back coil of back on the supporting frame formed;
The static magnetic field unit formed of magnetite supporting member by magnetite and supporting magnetite;
The framework that holds described front lens driver element, rear lens driver element and static magnetic field unit;
Be connected interior preceding supporting frame of described front lens driver element and the front spring between the framework; And
Be connected interior back supporting frame of described rear lens driver element and the rear spring between the framework,
Wherein, make front lens move to a certain position by passing to electric current on the circle that is at the front, the acting force of described front lens driver element suffered front spring on this position equals its suffered the action of a magnetic field power, and make rear lens move to a certain position by pass to electric current on the coil of back, the acting force of described rear lens driver element suffered rear spring on this position equals its suffered the action of a magnetic field power.
Make lens move to the desired position according to lens driver of the present invention by the mechanicals efforts of the action of a magnetic field power and spring, therefore can realize miniaturization and can avoid radially wobbling of lens.
In according to lens driver of the present invention, it serves as that 4 ribs are set at interval with 90 degree that preceding supporting frame can become ring-type and its underpart periphery, and the magnetite supporting member is that ring-type and its serve as that 4 projectioies are set at interval with 90 degree foremost.This structure is not only dwindled the moving area of Zhe and is reduced friction, and also has the effect of fixed lobe, thereby prevents the lateral deflection of front spring.In addition, owing to be equipped with the antagonism rib at interval,, suppress moving because of the moving front lens rib that produces of Zhe so can improve the rib forming accuracy with 180 degree relative positions.
In lens driver of the present invention, magnetite side along the circumferential direction be wedge-like with magnetite supporting member form fit.This structure is because magnetite side and magnetite supporting member form fit along the circumferential direction, thus can maximally utilise the magnetite radial thickness, thereby outside increasing and the magnetic flux density of inboard clearance portion.
In lens driver of the present invention, front spring and rear spring are made and after being fixed to lens driver interior all plectanes are blocked by the shape that couples together with interior all plectanes.This structure can more accurately be located two springs, and two springs can be made as a part, so reduced cost of parts.
Description of drawings
Fig. 1 is the schematic cross-section according to lens driver of the present invention.
Fig. 2 is another schematic cross-section of lens driver shown in Figure 1, and this cross section is vertical with cross section shown in Figure 1.
Fig. 3 is the skeleton view according to lens driver of the present invention.
Fig. 4 is the sectional view of lens driver shown in Figure 1 when in running order.
Fig. 5 a and 5b are front spring organigram in the lens driver of the present invention.
Fig. 6 a and 6b are rear spring organigram in the lens driver of the present invention.
Fig. 7 is the synoptic diagram of lens driver structure under the prior art.
Embodiment
Below describe the specific embodiment of the present invention in detail by accompanying drawing.
Shown in Fig. 1～3, comprise front lens 2, preceding supporting frame 3, preceding coil 4, front spring 5, rear lens 6, back supporting frame 7, back coil 8, rear spring 9, magnetite 10, magnetite supporting member 21 and framework 11 according to lens driver 1 of the present invention.Here " preceding " and the position of " back " relation all for object that camera is taken the photograph, that is, are represented farther usefulness " back " expression with " preceding " from the position that taking the photograph object is nearer.Below by accompanying drawing this lens driver 1 each ingredient is described.
Radially magnetized magnetite 10 and magnetite supporting member 21 constitute the static magnetic field unit.As shown in Figure 3, magnetite supporting member 21 is made in the form of a ring and by insulating material (for example synthetic resin etc.), comprise four peripheral position 21a that are used to support magnetite 10, and its bottom shape matches with the bottom of framework 11, four rectangular circular-arc magnetites 10 snap in the circumference side recess of magnetite supporting member 21 by peripheral position 21a supporting and circumferencial direction side, so can enlarge magnetite thickness and magnetic flux density.
Ring-shaped frame 11 can be made by wrought iron magnetic material, as shown in Figure 3, comprise outer wall 11a, inwall 11b and bottom surface 11c, outer wall 11a is higher than inwall 11b, inwall 11b serves as at interval otch 11d everywhere to be set with 90 degree, and the protruding 7a of back supporting frame 7 just in time can run through otch 11d.
Fig. 1 and Fig. 2 show front lens driver element, rear lens driver element, static magnetic field unit and are installed in diagrammatic cross-section in the framework.As shown in the figure, the magnetite supporting member 21 that magnetite 10 is housed inserts framework 11, and the bottom surface of magnetite supporting member 21 is fixed on the bottom surface of framework 11.In the lateral parts and the outer side clearance of preceding coil 4 between magnetite 10 and magnetite supporting member 21 and framework outer wall 11a of preceding supporting frame 22, its inside circumference near the bottom surface is provided with projection 22 with 90 intervals of spending, minimum protruding rib 23 is arranged on the projection, therefore it is moving to form Zhe with the outside of magnetite supporting member 21, and because 23 symmetrical distributions of protruding rib, so the location is accurate and the moving area of Zhe is little so that front lens 2 energy smoothnesses move and vibrate less.In addition, magnetite supporting member 21 has lug boss 21c, the projection 22 of this projection and preceding supporting frame 3 to offset in cylindrical upper end and plays fixation, and this structure had not only prevented that preceding supporting frame 3 from coming off but also suppressed the shift in position that spring 5 radial impacts cause.In back supporting frame 7 and the back interior side clearance of coil 8 between magnetite 10 and magnetite supporting member 21 and inwall 11b, formed thus with magnetite 10 be the beginning via outer wall 11a, bottom surface 11c, inwall 11b, the final magnetic loop that turns back to magnetite 10 again.As shown in the figure, front spring 5 is connected between the inwall 11b of preceding supporting frame 21 and framework 11, therefore whole front lens unit can move along the relative framework 11 of optical axis direction, rear spring 9 is connected between back supporting frame 7 and the magnetite supporting member 21, and therefore whole rear lens unit can move along the relative indirectly framework 11 of optical axis direction.In order to suppress the axial vibration of front lens 2 and rear lens, can choose the stronger spring of radial rigidity.
Below by Fig. 4 the principle of work of lens driver of the present invention is described.When passing to electric current in the current coil 4, magnetite 10 will produce the electromagnetic force of direction shown in the arrow among the figure to coil, and therefore whole front lens driver element (comprising front lens 2) moves forward.On the other hand, because the front spring 5 that is connected between front lens driver element and the framework 11 is in extended state, therefore will produce the corresponding elastic force opposite with direction shown in the arrow, the displacement of the relative spring balancing with the front lens driver element of this elastic force position is proportional.Elastic force equated with electromagnetic force and is in equilibrium locations when current lens unit moved to a certain position.Therefore, can make front lens 2 move to the desired position by the electric current that passes to suitable size in the circle 4 that is at the front.Equally, can make rear lens 6 move to the desired position by the electric current that in the coil 8 of back, passes to suitable size along direction shown in the arrow.
Fig. 5 (a) and 5 (b) are the shape of front spring after being fixed to before framework 11 and the front lens unit, in Fig. 5 (a), two spring elements connect by interior all plectanes, and in Fig. 5 (b), interior all plectanes are cut off, the two terminal 5a of place of interior all ends snap in preceding supporting frame and are fixed together, and the two terminal 5b of place of outer end are fixed on the front spring stator 21b of metal material manufacturing.The structure that all plectanes connect in adopting can reduce the centre deviation of spring center and lens, also can restrain the position deviation between the spring element.Front spring fixed head 21b and magnetite supporting member 21 are one-body molded, therefore front spring 5 accurately can be limited between two planes with the distortional stress of inhibiting effect in front spring 5.Two terminations of preceding coil 4 are connected to form the supply circuit of a DC current with terminal 5a with terminal 5b after inserting front spring fixed head 21b again.Therefore front spring 5 has not only played the elastic stretching and the contraction of spring, also plays electric action.
Fig. 6 (a) and 6 (b) are the shape of rear spring after being fixed to before framework 11 and the rear lens unit, in Fig. 6 (a), two spring elements connect by interior all plectanes, and in Fig. 5 (b), interior all plectanes are cut off, in two terminal 9a of place of all ends snap in the magnetite supporting member and be fixed together, the two terminal 9b of place of outer end are connected on the rear spring fixed head 31 as the conductive metal plate, then spring dead plate 31 is fixed in the bottom of back supporting frame 7 again.Two leads of back coil 8 run through otch 11d and are connected to rear spring fixed head 31, terminal 9a and 9b to be gone up to constitute DC loop along the side of protruding 7a.Therefore rear spring 9 has also played spring action and electric action.Consider conduction and elasticity double properties, can phosphor bronze as spring material.In addition, owing to adopt above-mentioned rear spring fixed head 31 structures, thus therefore back supporting frame 7 can be installed in the miniaturization of magnetite inboard implement device.
Claims (7)
1. a lens driver is characterized in that, comprises:
Comprise the preceding supporting frame of front lens, supporting front lens and be installed on before the front lens driver element of preceding coil on the supporting frame;
Comprise the back supporting frame of rear lens, supporting rear lens and be installed on the rear lens driver element of the back coil of back on the supporting frame;
The static magnetic field unit that comprises the magnetite supporting member of magnetite and supporting magnetite;
The framework that holds static magnetic field unit, front lens driver element and rear lens driver element;
Be connected interior preceding supporting frame of described front lens driver element and the front spring between the framework; And
Be connected interior back supporting frame of described rear lens driver element and the rear spring between the framework,
Wherein, make front lens move to a certain position by passing to electric current on the circle that is at the front, the acting force of described front lens driver element suffered front spring on this position equals its suffered the action of a magnetic field power, and make rear lens move to a certain position by pass to electric current on the coil of back, the acting force of described rear lens driver element suffered rear spring on this position equals its suffered the action of a magnetic field power.
2. lens driver as claimed in claim 1, it is characterized in that, described framework is ring-type and comprises inner and outer wall, described magnetite is placed between inwall and the outer wall, before described coil be ring-type and be placed on magnetite and outer wall between the gap in, described back coil be ring-type and be placed on magnetite and inwall between interior side clearance in.
3. lens driver as claimed in claim 2 is characterized in that the inwall of described framework is provided with otch, and described back supporting frame is that ring-type and its inner circumference are provided with some projectioies that match with the otch size.
4. as claim 2 or 3 described lens drivers, it is characterized in that, described before supporting frame be that ring-type and its underpart periphery serve as that 4 ribs are set at interval with 90 degree, described magnetite supporting member is that ring-type and its serve as that 4 projectioies are set at interval with 90 degree foremost.
5. lens driver as claimed in claim 4 is characterized in that, described magnetite side along the circumferential direction be wedge-like with magnetite supporting member form fit.
6. as any described lens driver in the claim 1,2,3 and 5, it is characterized in that described front spring and rear spring are made and after being fixed to lens driver interior all plectanes blocked by the shape that couples together with interior all plectanes.
7. lens driver as claimed in claim 4 is characterized in that, described front spring and rear spring are made and after being fixed to lens driver interior all plectanes blocked by the shape that couples together with interior all plectanes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021123977A CN1465996A (en) | 2002-07-05 | 2002-07-05 | Lens driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA021123977A CN1465996A (en) | 2002-07-05 | 2002-07-05 | Lens driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1465996A true CN1465996A (en) | 2004-01-07 |
Family
ID=34141899
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA021123977A Pending CN1465996A (en) | 2002-07-05 | 2002-07-05 | Lens driving device |
Country Status (1)
| Country | Link |
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| CN (1) | CN1465996A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362385C (en) * | 2004-12-15 | 2008-01-16 | 思考电机（上海）有限公司 | Lens drive device |
| CN100592132C (en) * | 2006-11-22 | 2010-02-24 | 鸿富锦精密工业（深圳）有限公司 | Lens module group |
| WO2010043078A1 (en) * | 2008-10-14 | 2010-04-22 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Multi-drive mechanism lens actuator |
| WO2010075681A1 (en) * | 2009-01-05 | 2010-07-08 | Hong Kong Applied Science and Technology Research Institute Co. Ltd | Miniature actuator and optical apparatus |
| US7791827B2 (en) | 2008-12-10 | 2010-09-07 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Miniature actuator and optical apparatus |
| CN101576646B (en) * | 2008-05-06 | 2012-09-19 | 鸿富锦精密工业（深圳）有限公司 | Micro-actuator component, micro-actuator and lens module |
| TWI385472B (en) * | 2006-11-17 | 2013-02-11 | Hon Hai Prec Ind Co Ltd | Lens module and adjusting device of the lens module |
| CN103018874A (en) * | 2011-09-21 | 2013-04-03 | 思考电机（上海）有限公司 | A lens driving apparatus, an automatic focusing camera, and a mobile terminal equipped with a camera |
| CN101557177B (en) * | 2008-04-08 | 2013-07-03 | 鸿富锦精密工业（深圳）有限公司 | Piezoelectric driver and lens module |
| CN105899991A (en) * | 2014-01-28 | 2016-08-24 | 奥林巴斯株式会社 | Drive unit, optical unit, image pickup apparatus, and endoscope |
| CN112255713A (en) * | 2020-11-02 | 2021-01-22 | 山东大学 | Zoom liquid lens based on magnetic field regulation and control and optical amplification instrument |
-
2002
- 2002-07-05 CN CNA021123977A patent/CN1465996A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100362385C (en) * | 2004-12-15 | 2008-01-16 | 思考电机（上海）有限公司 | Lens drive device |
| TWI385472B (en) * | 2006-11-17 | 2013-02-11 | Hon Hai Prec Ind Co Ltd | Lens module and adjusting device of the lens module |
| CN100592132C (en) * | 2006-11-22 | 2010-02-24 | 鸿富锦精密工业（深圳）有限公司 | Lens module group |
| CN101557177B (en) * | 2008-04-08 | 2013-07-03 | 鸿富锦精密工业（深圳）有限公司 | Piezoelectric driver and lens module |
| CN101576646B (en) * | 2008-05-06 | 2012-09-19 | 鸿富锦精密工业（深圳）有限公司 | Micro-actuator component, micro-actuator and lens module |
| WO2010043078A1 (en) * | 2008-10-14 | 2010-04-22 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Multi-drive mechanism lens actuator |
| CN101542348B (en) * | 2008-10-14 | 2011-04-20 | 香港应用科技研究院有限公司 | Multi-actuator lens actuating device |
| US7791827B2 (en) | 2008-12-10 | 2010-09-07 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Miniature actuator and optical apparatus |
| WO2010075681A1 (en) * | 2009-01-05 | 2010-07-08 | Hong Kong Applied Science and Technology Research Institute Co. Ltd | Miniature actuator and optical apparatus |
| CN103018874A (en) * | 2011-09-21 | 2013-04-03 | 思考电机（上海）有限公司 | A lens driving apparatus, an automatic focusing camera, and a mobile terminal equipped with a camera |
| CN105899991A (en) * | 2014-01-28 | 2016-08-24 | 奥林巴斯株式会社 | Drive unit, optical unit, image pickup apparatus, and endoscope |
| CN105899991B (en) * | 2014-01-28 | 2019-07-05 | 奥林巴斯株式会社 | Driving unit, optical unit, photographic device and endoscope |
| US10459192B2 (en) | 2014-01-28 | 2019-10-29 | Olympus Corporation | Driving unit, optical unit, imaging apparatus, and endoscope |
| CN112255713A (en) * | 2020-11-02 | 2021-01-22 | 山东大学 | Zoom liquid lens based on magnetic field regulation and control and optical amplification instrument |
| CN112255713B (en) * | 2020-11-02 | 2021-08-10 | 山东大学 | Zoom liquid lens based on magnetic field regulation and control and optical amplification instrument |
| WO2022088423A1 (en) * | 2020-11-02 | 2022-05-05 | 山东大学 | Zooming liquid lens based on magnetic field regulation and control, and optical amplification instrument |
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