WO2007116907A1 - レンズ駆動装置 - Google Patents
レンズ駆動装置 Download PDFInfo
- Publication number
- WO2007116907A1 WO2007116907A1 PCT/JP2007/057554 JP2007057554W WO2007116907A1 WO 2007116907 A1 WO2007116907 A1 WO 2007116907A1 JP 2007057554 W JP2007057554 W JP 2007057554W WO 2007116907 A1 WO2007116907 A1 WO 2007116907A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gear
- lens
- gears
- driving device
- lens holder
- Prior art date
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 241000135194 Pione Species 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 241000920340 Pion Species 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
Definitions
- the present invention relates to a lens driving device including a speed reduction mechanism.
- a rotating shaft having a male screw portion and a cylindrical portion formed on the outer periphery, and a shaft supporting portion that supports both ends of the rotating shaft, respectively.
- a gear fixed to the rotating shaft and a driving gear meshing with the gear are connected, and a motor that rotates the rotating shaft, a female screw portion that is screwed with a male screw portion of the rotating shaft, and a cylindrical portion of the rotating shaft are slid.
- a lens holder having a cylindrical portion formed on the inner peripheral surface with a fitting portion that comes into contact, a guide shaft arranged in parallel with a rotation shaft that supports the lens holder together with the rotation shaft, and urges the rotation shaft to the shaft support portion
- Some have a spring.
- the lens holder is supported on the rotating shaft via a cylindrical portion, and the cylindrical portion serves as a driven portion of the lens holder when the lens holder is moved.
- the motor is driven to rotate, and the rotating shaft is rotated via the driving gear and the gear, so that the male screw portion of the rotating shaft and the female screw portion of the cylindrical portion of the lens holder are screwed together. Further, the lens holder is moved in the optical axis direction of the lens while being guided by the guide shaft through the cylindrical portion.
- Patent Document 1 Japanese Patent Laid-Open No. 9-32902 (Fig. 7)
- the present invention has been made in view of the above circumstances, and an object thereof is to provide a lens driving device that can prevent the lens holder of the lens holder from tilting in the optical axis direction.
- a lens driving device of the present invention is a lens driving device that moves a lens holder that holds a lens in the optical axis direction of the lens, and is rotated simultaneously and has a rotational speed. Utilizing two different gears, the difference in rotational speed between the two gears, and their rotational motion, one of the two gears is linearly moved along the optical axis direction of the lens.
- the movement direction conversion means is provided in a male screw portion provided in one gear of the two gears and in the other gear of the two gears, and is screwed into the male screw portion. And a female screw portion to be joined.
- the male screw portion is formed on an outer peripheral surface of a boss portion formed in the center of the one gear, and the female screw portion is formed of a through hole formed in the center of the other gear. It may be formed on the inner peripheral surface.
- the two gears constitute a first gear group
- the first gear group includes two gears constituting the first gear group. Let it be rotated through a second gear group consisting of two gears.
- the lens holder has a substantially cylindrical shape
- the driven part includes a protrusion provided so as to protrude from a side wall of the lens holder. Also good.
- the side wall of the lens holder may be provided with a rotation stopper that prevents the rotation of the lens holder!
- the present invention it is possible to provide a lens driving device capable of preventing the lens holder of the lens holder from tilting in the optical axis direction.
- FIG. 1 is a cross-sectional view showing a configuration of a lens driving device according to an embodiment of the present invention and a lens holder positioned below.
- FIG. 2 is a sectional view of the lens driving device shown in FIG. 1 when the lens holder is positioned above.
- FIG. 3 is a plan view showing the overall configuration of the lens driving device shown in FIG.
- FIG. 4 is a block diagram of a control circuit for controlling the lens driving device shown in FIG. Explanation of symbols
- the lens driving device 1 is a mechanism that moves the lens 21 held by the lens holder 20 in the direction of the optical axis of the lens 21.
- the lens holder 20 has a substantially cylindrical shape.
- the lens 21 is incorporated into the cylindrical shape.
- the lens driving device 1 includes a first case 2 and a second case 3 that are a pair of upper and lower cases, and a drive unit 10 that includes a step motor 11 that is an electromagnetic actuator. And a lens holder 20 driven by the drive unit 10.
- An intermediate plate 4 is provided between the first case 2 and the second case 3.
- the drive unit 10 includes a speed reduction mechanism, and includes a step motor 11, a two-stage gear 12 that meshes with the pione of the step motor 11, 2
- a step gear 12 is provided with a first gear 13 and a second gear 14 that mesh with each other.
- the step motor 11 rotates the rotor 11a to move the lens holder 20 in the direction of the optical axis via a gear group such as the two-stage gear 12.
- the step motor 11 includes a rotor 11a, a rotor shaft l ib, a stator 11c, a coil l id, and a pinion l ie.
- the rotor 11a rotates about the rotor shaft l ib by the rotational torque generated by the magnetic force between the rotor 11a and the stator 11c.
- the rotor 11a is made of, for example, a rare earth / iron-based magnet material, and is formed in a small diameter cylindrical shape or disk shape.
- the rotor 11a has a plurality of magnetic poles having different polarities alternately in the rotation direction. These magnetic poles are provided at equal intervals in the rotation direction of the rotor 11a.
- the rotor shaft l ib and the pinion l ie are integrally formed by insert molding in which the rotor 11a is set in a mold and the rotor shaft l ib and the pinion l ie are injection-molded. Note that the rotor shaft l ib and the pinion l ie are independent, and the pinion l ie is fitted to the rotor shaft l ib. It may be fixed. Further, the rotor lla, the rotor shaft lib, and the pinion lie may be integrally formed of the same material.
- One end of the rotor shaft l ib is rotatably supported by the bearing portion 2a of the first case 2 and the other end of the rotor shaft 1 lb is rotatably supported by the bearing portion 3a of the second case 3.
- the pinion l ie rotates together with the rotor 11a and the rotor shaft l ib to transmit the rotational motion to the two-stage gear 12.
- the stator 11c is for guiding the magnetic flux of the excited coil l id to the magnetized magnetic poles of the rotor 11a.
- the stator 11c is made of a soft magnetic material such as iron or permalloy, for example.
- the stator 11c is formed with three pole teeth 111c that are magnetized when the coil id is energized.
- the pole teeth 111c are arranged so as to face the magnetic poles provided on the rotor 11a.
- the stator 11c is positioned on the mounting portion 2c of the first case 2 and the like.
- the coil id is magnetized by applying a positive or negative voltage to the stator 11c.
- the coil l id is composed of a pair of coils wound around the stator 11c.
- the coil l id is connected to a terminal board (not shown).
- the step motor 11 is excited by applying a positive voltage or a negative voltage to the coil id, so that the pole teeth of the magnetized stator 11c and each magnetic pole of the rotor 11a Then, a suction force or a repulsive force is generated to generate a rotational torque in the rotor 11a, and the rotor 11 is rotated in the clockwise direction or the counterclockwise direction.
- the two-stage gear 12 is engaged with the pinion lle, the first gear 13 and the second gear 14, and thereby the rotational motion of the rotor 11a of the step motor 11 is changed to the first gear 13 and It is transmitted to the second gear 14.
- the two-stage gear 12 is formed of a two-stage gear coaxially and integrally, and is composed of a small-diameter gear 12a and a large-diameter gear 12b having more teeth than the small-diameter gear 12, and a through hole 12c is formed at the center. Is formed.
- the shaft 4 a of the two-stage gear 12 is erected on the intermediate plate 4, and the end of the shaft 4 a is fitted and fixed to the shaft hole 3 b of the second case 3. In FIG.
- the two-stage gear 12 is rotatably supported on the shaft 4a so that the small-diameter gear 12a is disposed on the upper side and the large-diameter gear 12b is disposed on the lower side. Further, the small-diameter gear 12a meshes with the first gear 13, and the large-diameter gear 12b meshes with the pion 1le and the second gear 14! /.
- the first gear 13 and the second gear 14 convert the rotational motion of the gears 13 and 14 into a motion direction conversion unit 1. This is converted into a linear motion by 31a and 141a and transmitted to the lens holder 20.
- the first gear 13 is a large-diameter gear with many teeth
- the second gear 14 is a small-diameter gear with fewer teeth than the first gear 13! /.
- the first gear 13 has a female threaded portion 13 la formed on the inner peripheral surface of the central through hole 13a
- the second gear 14 has a male threaded portion 141a formed on the outer peripheral surface of the boss portion 14a formed at the center. Is formed.
- a through hole 14b is formed at the center of the boss portion 14a of the second gear 14.
- the number of teeth meshed with the two-stage gear 12 of the first gear 13 and the second gear 14 is appropriately determined, even if the relative movement angles of the first gear 13 and the second gear 14 are the same, The reduction ratio of the first gear 13 and the second gear 14 with respect to the rotational speed of the rotor 11a can be increased.
- a combination with a higher reduction ratio and higher torque is employed. In this way, the lens holder 20 can be moved smoothly even if a small motor with a small torque is used. Since a small motor with a small torque can be used, the power consumption of the camera can be reduced.
- the shaft 5 into which the through-hole 14b of the second gear 14 is fitted is fitted into the shaft hole 2b of the first case 2 at one end and the shaft hole 3c of the second case 3 at the other end. Mated and fixed. Since the shaft 5 is a fixed shaft, the shaft hole 2b and the shaft hole 3c have fitting backlash.
- the first gear 13 and the second gear 14 are coaxially attached to the shaft 5 in a state where the female screw portion 131a and the male screw portion 141a are screwed together. Since the shaft 5 is not a shaft having a threaded portion like a screw screw, the clearance between the second gear 14 and the shaft 5 only needs to be wide enough to move in the axial direction. When the second gear 14 is moved in the axial direction by a screw screw or the like, the clearance of the screw thread portion becomes larger than that provided on the shaft having no thread portion. Therefore, the configuration of the present embodiment in which the second gear 14 is provided on the shaft 5 can suppress the inclination in the optical axis direction due to the backlash of the lens holder 20 to be smaller.
- the first gear 13 and the second gear 14 can rotate independently, and the degree of screwing of the female screw portion 131a and the male screw portion 141a varies depending on the rotational speed difference between the first gear 13 and the second gear 14. It is possible to make it happen. That is, the second gear 14 is movable in the axial direction.
- the lens holder 20 holds a lens 21.
- the lens holder 20 protrudes from the side wall.
- the provided protrusion 20a is formed.
- a through hole 201a is formed in the projection 20a in a direction perpendicular to the surface of the lens 21, and the shaft 5 is fitted into the through hole 201a.
- the protrusion 20a abuts on the second gear 14, is coaxially mounted on the shaft 5 so as to be movable in the axial direction, and serves as a driven portion of the lens holder 20.
- a rotation stopper 20b for restricting the rotational movement of the lens holder 20 is formed on the outer periphery of the lens holder 20.
- the coil spring 6 is an elastic member provided between the first case 2 and the protrusion 20 a of the lens holder 20.
- the coil spring 6 urges the protrusion 20a toward the second gear 14 so that the protrusion 20a follows the second gear 14 in the axial direction.
- the shaft 5 is provided with a first gear 13, a second gear 14, a protrusion 20a, and a coil spring 6 coaxially.
- the lens driving device 1 includes components that constitute an optical system (not shown) such that an imaging element (not shown) is provided on the substrate at a position facing the lens 21 held by the lens holder 20. .
- the rotational motion of the two-stage gear 12 is transmitted from the small-diameter gear 12a and the large-diameter gear 12b to the first gear 13 and the second gear 14, respectively, and the first gear 13 and the second gear 14 are simultaneously Rotated. Since the second gear 14 has a higher rotational speed than the first gear 13 (the rotation angle is larger), as shown in FIG. 2, the female thread 131a of the first gear 13 and the male thread of the second gear 14 The degree of screwing of the portion 141a is deepened, and the second gear 14 moves upward.
- the control unit 50 includes a CPU (Central Processing Unit) 51, a memory 52, and a driver 53, as shown in FIG.
- the CPU 51 performs control and arithmetic processing of the entire lens driving device 1.
- the memory 52 stores a program and control information for controlling the lens driving device 1.
- the driver 53 applies a positive or negative driving voltage to the coil id in a pulsed manner to excite it.
- the operation button 54 is connected to the CPU 51.
- the CPU 51 instructs the driver 53 to output a positive voltage or a negative voltage in order to drive the step motor 11.
- the driver 53 applies a positive voltage or a negative voltage to the coil id of the step motor 11 according to the instruction.
- the lens holder 20 is attached to the lens 21 as described above. Focusing can be performed by moving in the direction of the optical axis.
- the rotational direction difference (rotational speed difference) between the first gear 13 and the second gear 14 by the motion direction conversion units 131a and 141a in a screwing relationship.
- the shaft 5 for supporting the second gear 14, the projection 20a of the lens holder 20 and the coil spring 6 on the same axis can be constituted by a fixed shaft.
- miniaturization and power saving can be facilitated, the drive sound can be reduced, the number of parts can be reduced, and the cost can be reduced, and a large reduction ratio can be obtained and high accuracy can be obtained. Can be realized and the design becomes easy.
- the protrusion 20a is formed on the side wall of the lens holder 20 having a substantially cylindrical shape, and the protrusion 20a serves as a driven part.
- the layout of various elements constituting the apparatus 1 can be determined more suitably. It also greatly contributes to the overall compactness of the device.
- a pinion lie is formed in a body-like manner on the rotor shaft l ib of the step motor 11 and the two-stage gear 12 meshing with the pinion lie
- a two-stage gear may be installed directly.
- two types of independent gears may be used instead of the force two-stage gear 12 described in the example using the two-stage gear 12 formed integrally.
- step motor 11 is used as one drive source.
- any drive source that generates a rotational motion may be used, and the step motor 11 is not limited. I can't.
- the force described in the example using the small-diameter gear 12a and the large-diameter gear 12b constituting the two-stage gear 12 and the first gear 13 and the second gear 14 is used.
- the first gear 13 Where m is the number of teeth of the second gear 14 and n is the number of teeth of the second gear 14, the number of teeth of the gear meshing with the first gear 13 is n, and the number of teeth of the gear meshing with the second gear 14 is m.
- the number of teeth of the first gear 13 is b
- the number of teeth of the second gear 14 is c
- the number of teeth of the gear meshing with the first gear 13 is d
- the number of teeth of the gear meshing with the second gear 14 is If the number of teeth is e, cZe and bZd do not match and the number of teeth is a combination. This is because, if this number of teeth is combined, a difference in rotational speed between the first gear 13 and the second gear 14 occurs, and this is the force that can drive the driven object.
- the lens driving device of the present invention can be used in various electronic devices that can image the outside world using a lens such as a handy camera and a mobile phone.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/296,906 US7768726B2 (en) | 2006-04-12 | 2007-04-04 | Lens drive device |
KR1020087021995A KR101049458B1 (ko) | 2006-04-12 | 2007-04-04 | 렌즈 구동장치 |
CN2007800127621A CN101421657B (zh) | 2006-04-12 | 2007-04-04 | 镜头驱动装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2006110166A JP4461116B2 (ja) | 2006-04-12 | 2006-04-12 | レンズ駆動装置 |
JP2006-110166 | 2006-04-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007116907A1 true WO2007116907A1 (ja) | 2007-10-18 |
Family
ID=38581197
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2007/057554 WO2007116907A1 (ja) | 2006-04-12 | 2007-04-04 | レンズ駆動装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7768726B2 (ja) |
JP (1) | JP4461116B2 (ja) |
KR (1) | KR101049458B1 (ja) |
CN (1) | CN101421657B (ja) |
WO (1) | WO2007116907A1 (ja) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007292880A (ja) * | 2006-04-21 | 2007-11-08 | Seiko Precision Inc | レンズ駆動装置 |
KR20090119989A (ko) * | 2007-10-16 | 2009-11-23 | 세이코 프레시죤 가부시키가이샤 | 렌즈 구동 장치 |
JP2010061031A (ja) * | 2008-09-05 | 2010-03-18 | Nidec Sankyo Corp | レンズ駆動装置 |
US8265471B2 (en) * | 2009-07-24 | 2012-09-11 | Panasonic Corporation | Lens barrel and imaging device |
CN104899197A (zh) * | 2014-03-03 | 2015-09-09 | 上海市闵行第二中学 | 公交站点换乘查询系统 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0932902A (ja) * | 1996-05-17 | 1997-02-07 | Minolta Co Ltd | 直進機構 |
JP2000193877A (ja) * | 1998-12-28 | 2000-07-14 | Canon Inc | 位置制御装置、焦点調節装置及びカメラ |
JP2002184066A (ja) * | 2000-12-08 | 2002-06-28 | Alpine Electronics Inc | ディスク回転駆動装置 |
JP2006293263A (ja) * | 2004-07-21 | 2006-10-26 | Seiko Instruments Inc | 光学モジュール及びカメラモジュール |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3370907A (en) * | 1965-02-04 | 1968-02-27 | Bell & Howell Co | Power operated zoom and focus control with selective optical paths to viewfinder |
US3528628A (en) * | 1968-05-20 | 1970-09-15 | Eastman Kodak Co | Reel spindle drive means for film reader or the like |
US3533347A (en) * | 1968-08-19 | 1970-10-13 | Instrumentation Marketing Corp | Automatic exposure control for cameras |
US5115348A (en) * | 1989-07-26 | 1992-05-19 | Canon Kabushiki Kaisha | Lens barrel |
US5086312A (en) * | 1989-08-31 | 1992-02-04 | Fuji Photo Film Co., Ltd. | Variable focal length camera with focus adjusting device |
JP2771895B2 (ja) * | 1990-11-14 | 1998-07-02 | 富士写真フイルム株式会社 | ズームレンズ装置 |
JPH04345116A (ja) * | 1991-05-23 | 1992-12-01 | Minolta Camera Co Ltd | バリフォーカルレンズ鏡胴 |
US5684640A (en) * | 1994-04-27 | 1997-11-04 | Nikon Corporation | Camera with vibration compensation device having anti-vibration lens urging mechanism and feed screw mechanism |
EP0720043B1 (en) * | 1994-12-28 | 2002-10-09 | Canon Kabushiki Kaisha | Objective lens barrel |
CN2411496Y (zh) * | 2000-01-25 | 2000-12-20 | 雷培智 | 可伸缩镜头自动照相机的齿轮定位装置 |
JP2005326628A (ja) * | 2004-05-14 | 2005-11-24 | Optech:Kk | レンズ鏡筒 |
US7280278B2 (en) * | 2004-06-02 | 2007-10-09 | Micron Technology, Inc. | Apparatus and method for manufacturing positive or negative microlenses |
CN1725051A (zh) * | 2004-07-21 | 2006-01-25 | 精工电子有限公司 | 光学模块以及照相机模块 |
-
2006
- 2006-04-12 JP JP2006110166A patent/JP4461116B2/ja not_active Expired - Fee Related
-
2007
- 2007-04-04 CN CN2007800127621A patent/CN101421657B/zh not_active Expired - Fee Related
- 2007-04-04 KR KR1020087021995A patent/KR101049458B1/ko not_active IP Right Cessation
- 2007-04-04 WO PCT/JP2007/057554 patent/WO2007116907A1/ja active Application Filing
- 2007-04-04 US US12/296,906 patent/US7768726B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0932902A (ja) * | 1996-05-17 | 1997-02-07 | Minolta Co Ltd | 直進機構 |
JP2000193877A (ja) * | 1998-12-28 | 2000-07-14 | Canon Inc | 位置制御装置、焦点調節装置及びカメラ |
JP2002184066A (ja) * | 2000-12-08 | 2002-06-28 | Alpine Electronics Inc | ディスク回転駆動装置 |
JP2006293263A (ja) * | 2004-07-21 | 2006-10-26 | Seiko Instruments Inc | 光学モジュール及びカメラモジュール |
Also Published As
Publication number | Publication date |
---|---|
KR20080092479A (ko) | 2008-10-15 |
JP4461116B2 (ja) | 2010-05-12 |
KR101049458B1 (ko) | 2011-07-15 |
CN101421657A (zh) | 2009-04-29 |
CN101421657B (zh) | 2010-09-01 |
US20090174956A1 (en) | 2009-07-09 |
US7768726B2 (en) | 2010-08-03 |
JP2007286130A (ja) | 2007-11-01 |
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