CN107085275B - Lens driving device - Google Patents
Lens driving device Download PDFInfo
- Publication number
- CN107085275B CN107085275B CN201710046917.9A CN201710046917A CN107085275B CN 107085275 B CN107085275 B CN 107085275B CN 201710046917 A CN201710046917 A CN 201710046917A CN 107085275 B CN107085275 B CN 107085275B
- Authority
- CN
- China
- Prior art keywords
- suspension wire
- movable unit
- lens
- driving device
- base
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
-
- 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
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
- G03B3/10—Power-operated focusing
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0007—Movement of one or more optical elements for control of motion blur
- G03B2205/0015—Movement of one or more optical elements for control of motion blur by displacing one or more optical elements normal to the optical axis
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0053—Driving means for the movement of one or more optical element
- G03B2205/0069—Driving means for the movement of one or more optical element using electromagnetic actuators, e.g. voice coils
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Adjustment Of Camera Lenses (AREA)
- Lens Barrels (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
The invention provides a lens driving device, which enables a suspension wire supporting a movable unit capable of carrying a lens body for correcting hand shake to exert a vibration reduction function. A movable unit (20) on which a lens holding frame (25) is mounted is supported by a suspension wire (8) fixed to a base (11), and the movable unit (20) is driven in a direction intersecting the optical axis direction by an axis intersecting drive mechanism provided above the base (11). By forming the suspension wire (8) from a Cu-based shape memory alloy of a martensite phase, the suspension wire (8) can exhibit a vibration damping function, and high-order resonance and the like of the movable unit (20) can be suppressed.
Description
Technical Field
The present invention relates to a lens driving device for moving a movable unit capable of mounting a lens body in a direction intersecting an optical axis of a lens, and more particularly to a lens driving device having a function of suppressing unnecessary vibration of the movable unit.
Background
Patent document 1 describes an invention relating to a lens driving device.
In the lens driving device described in patent document 1, four suspension wires are fixed to a coil substrate, and an AF (auto focus) unit is supported by the tip portions of the suspension wires.
In the AF unit, a lens holder on which a lens is mounted is provided inside the magnet holder. An upper plate spring is fixed to an upper end of the magnet holder, and an upper end portion of the lens holder is supported by the upper plate spring. A lower plate spring is fixed to the lower end of the magnet holder, and the lower end of the lens holder is supported by the lower plate spring. Further, an upper end portion of the suspension is fixed to the upper leaf spring.
The AF unit is provided with a focus drive mechanism, and a lens holder supported by an upper plate spring and a lower plate spring is moved in the optical axis direction by the drive force. A camera shake correction mechanism is provided between the base and the AF unit, and the AF unit supported by the suspension wires is moved in a direction orthogonal to the optical axis by the driving force of the camera shake correction mechanism.
The focus drive mechanism includes a focus coil wound around an outer periphery of the lens holder, and a permanent magnet held inside the magnet holder and facing the focus coil. The camera shake correction mechanism is provided with a camera shake correction coil on the upper surface of the base, and the lower end of the permanent magnet is opposed to the camera shake correction coil.
In the lens driving device described in patent document 1, damping members are provided between four lower protrusions formed on a magnet holder of the AF unit and the coil substrate. The damping member is formed of ultraviolet curing silicone.
By providing this damper, it is possible to suppress the occurrence of high-order resonance in the optical axis direction of the AF unit when the lens holding frame is driven in the optical axis direction within the AF unit, and also to alleviate the impact on the AF unit when an impact from the outside is given.
Prior art documents
Patent document 1: japanese patent laid-open publication No. 2013-44924
In the lens driving device described in patent document 1, in order to suppress the high-order resonance of the AF unit, an ultraviolet-curing silicone rubber is applied between the magnet holder and the coil substrate, but since the lens driving device is very small, it is extremely difficult to apply a silicone rubber finely and in a proper amount at the above-mentioned position. Further, since the amount of silicone gel applied is likely to vary, the effect of suppressing the vibration of the AF unit is likely to vary for each lens driving device.
Disclosure of Invention
Problems to be solved by the invention
The present invention has been made to solve the above conventional problems, and an object of the present invention is to provide a lens driving device capable of suppressing unnecessary vibration of a movable unit supported by a suspension wire without using a rubber-like damper or the like.
Solution scheme
The lens driving device of the present invention is a lens driving device including a base, a movable unit on which a lens body is mountable, a support member for supporting the movable unit on the base, and a driving mechanism for moving the movable unit in a direction intersecting with an optical axis direction, wherein the support member is a suspension wire which connects the base and the movable unit and is deformable in the direction intersecting with the optical axis direction, and the suspension wire is formed of a shape memory alloy of a martensite phase.
A lens driving device of the present invention is provided with a suspension wire of a shape memory alloy of a martensite phase as a support member for supporting a movable unit to be movable in a direction intersecting with an optical axis direction. Since the shape memory alloy in the martensite phase has a vibration damping function, generation of unnecessary vibration such as high-order resonance in the movable unit can be suppressed.
In the present invention, a plurality of suspension wires may be provided in which all the support members are formed of a shape memory alloy, a suspension wire in which some of the support members are formed of a shape memory alloy, or a suspension wire in which other support members are formed of a normal metal such as copper or a copper alloy. That is, by forming at least a part of the support member as a suspension wire made of a shape memory alloy, unnecessary vibration during operation of the movable unit can be suppressed.
In the lens driving device according to the present invention, it is preferable that the movable unit includes a lens holder, a first coil for moving the lens holder in the optical axis direction, and a magnet, the suspension wire is an energizing path for energizing the first coil, and the suspension wire maintains the state of the martensite phase even during energization.
As described above, when the first coil is energized through the suspension wire, the suspension wire can always exhibit a vibration damping function by avoiding the austenite phase that is transformed into a superelastic state or the like by heating with current.
In the lens driving device of the present invention, it is preferable that the suspension wire is formed of a Cu-based shape memory alloy.
By using a Cu-based shape memory alloy, the resistance value when the first coil is energized can be reduced, and the vibration damping function can be effectively exhibited in a martensite phase state.
In the lens driving device of the present invention, it is preferable that the suspension wire maintains a straight shape even in a state of being transformed into an austenite phase.
In the above configuration, even in a state of being left in a high temperature state for a long time, the suspension wire can maintain a straight shape, and therefore, the supporting state of the movable unit can be always stabilized.
In the lens driving device according to the present invention, it is preferable that a temperature at which the magnet provided in the driving mechanism irreversibly demagnetizes is lower than a transformation temperature at which the suspension is transformed into an austenite phase.
Such a lens driving device is used in a temperature range in which the magnet constituting the driving mechanism is not demagnetized, but the suspension wire is set so as not to be transformed into an austenite phase in this range, whereby the suspension wire can always exhibit a vibration damping function.
Effects of the invention
The present invention uses a suspension wire of a martensite phase as a support member for supporting a movable unit, and can suppress generation of unnecessary vibrations such as higher order resonance when the movable unit is driven in a direction intersecting with an optical axis direction, thereby enabling stable hand shake correction and the like.
Drawings
Fig. 1 is a perspective view showing a lens driving device according to an embodiment of the present invention from above.
Fig. 2 is a perspective view showing the lens driving device shown in fig. 1 with the cover removed.
Fig. 3 is an exploded perspective view of the lens driving device shown in fig. 1, the lens driving device being disassembled into a cover, a base, and a movable unit.
Fig. 4 is a sectional view of the lens driving apparatus shown in fig. 1 taken along line IV-IV.
Description of reference numerals:
1a lens driving device;
2, covering;
8, hanging wires;
11, a base platform;
12 a metal base;
20 a movable unit;
21 a movable base;
25a lens holding frame;
30 a first leaf spring;
31 dividing the spring part;
40 a second plate spring;
50 an axial drive mechanism;
51 a first coil;
52a magnet;
60 a metal member;
63a side plate part;
a 70-axis cross drive mechanism;
71a second coil;
o central axis.
Detailed Description
The lens driving device 1 shown in fig. 1 is mounted in a mobile phone, a mobile information terminal device, or the like together with an image pickup element. Although not shown in the following embodiments, a lens body (a lens barrel or a lens itself) facing the image pickup device may be mounted on the lens driving device 1, the lens body may be driven in the optical axis direction to perform autofocus, and the lens body may be driven in a direction intersecting the optical axis direction to perform camera shake correction.
In the drawings, the Z1 direction is above the lens drive device 1, and the Z2 direction is below the lens drive device. The Z1 direction is the front where the object to be imaged by the imaging element is present, and the Z2 direction is the rear where the imaging element is present.
Fig. 1 shows the entire structure of the lens driving device 1, fig. 2 shows the lens driving device 1 with the cover removed, and fig. 3 shows the lens driving device 1 divided into main portions.
As shown in fig. 3, the lens driving device 1 includes a base structure portion 10. A base 11 made of synthetic resin is provided on the base structure portion 10, and metal bases 12 made of metal plates divided into 2 pieces are embedded in the base 11. The metal base 12 and the base 11 are integrally formed by a so-called insert molding method. Base end portions 8a of four suspension wires 8 constituting a support member are fixed to the metal base 12, and the movable unit 20 is supported by tip end portions 8b of the suspension wires 8 so as to be movable in a direction intersecting the Z axis (orthogonal direction).
The four suspension wires 8 are formed of a shape memory alloy. The shape memory alloy is a Cu-based alloy, such as Cu-Al-Ni (copper-aluminum-nickel) alloy, Cu-Zn-Al (copper-zinc-aluminum) alloy, Cu-Al-Mn (copper-aluminum-manganese) alloy.
The suspension wire 8 is used in a state where the shape memory alloy is in a martensite phase. The state of the martensite phase in the present specification means that the martensite phase dominates as a crystal structure, and does not mean that the crystal structure is strictly required to be 100% martensite phase.
The shape memory alloy has a Young's modulus of about 23 to 41GPa in the martensite phase and about 70 to 80GPa in the austenite phase (the state in which the austenite phase is dominant). The shape memory alloy exhibits superelastic characteristics when transformed into the austenite phase, but exhibits slightly viscoelastic characteristics in the martensite phase, and is capable of exhibiting a vibration damping function as well as being an elastic body. In particular, the copper-based shape memory alloy can exhibit a vibration damping function when used in a martensite phase. Among the alloys, a Cu-Al-Mn (copper-aluminum-manganese) alloy, a Cu-Zn-Al (copper-zinc-aluminum) alloy can exert a high vibration damping function in a martensite phase.
The suspension wire 8 has a circular cross section, the suspension wire 8 linearly extends in the optical axis direction of the lens body, has a diameter of about 50 μm, and has a support span of about 3mm for supporting the movable unit 20 on the base 11.
The suspension wire 8 can maintain a straight shape even when it is transformed from the martensite phase to the austenite phase. Thus, even if the usage environment of the lens driving device 1 is undesirably high and the suspension wire 8 is transformed into the austenite phase, the movable unit 20 can be stably supported.
Since four suspension wires 8 are used, for example, two of them may be formed of the shape memory alloy, and the other two may be formed of a copper alloy or the like other than the shape memory alloy.
When the suspension wire 8 is made of a Cu-based shape memory alloy or both of a Cu-based shape memory alloy and a copper alloy, as will be described later, the resistance value of current flow can be reduced when the suspension wire 8 is used as a current flow path for supplying current to the first coil.
As shown in fig. 3, the movable unit 20 has a movable base 21 located at the uppermost portion in the Z1 direction. The movable base 21 is formed of a synthetic resin material. A frame portion 22 having a square shape (substantially square shape) in a plan view and four leg portions 23 extending downward (Z2 direction) from four corners of the frame portion 22 are integrally formed on the movable base 21.
In the movable unit 20, a lens holder 25 is supported on the movable base 21. The lens holder 25 is made of synthetic resin, and has a circular holding hole 26 penetrating in the vertical direction (Z direction) in the center portion thereof. The lens for image pickup is held by a lens barrel, and the lens barrel (lens body) is fitted and fixed to the holding hole 26. In the embodiment, the lens and the lens barrel are not shown.
The center axis O of the lens holder 25 coincides with the optical axis of the lens, and the center axis O is parallel to the Z direction.
As shown in fig. 4, a first coil 51 constituting an axial driving mechanism (focus driving mechanism) 50 is wound around the outer periphery of the lens holder 25. The wire of the first coil 51 is wound in a direction around the center axis O, and a control current applied to the first coil 51 flows in a direction intersecting the center axis O.
As shown in fig. 2 and 3, the first plate spring 30 is composed of two divided spring portions 31 and 31 independent of each other. Each of the divided spring portions 31 is formed of a conductive elastic metal plate such as a copper alloy or a phosphor bronze plate. The outer fixing portion 32 and the inner fixing portion 33 of each divided spring portion 31, and the spring deformation portion 34 connecting the outer fixing portion 32 and the inner fixing portion 33 are integrally formed.
The outer fixing portion 32 of the first leaf spring 30 is fixed to a lower surface of the frame 22 formed on the movable base 21 facing downward (Z2 side). As shown in fig. 4, the inner fixing portion 33 of the first plate spring 30 is fixed to the upper surface 25a of the lens holding frame 25.
The second plate spring 40 is integrally formed of a metal plate having elasticity. The outer fixing portion, the inner fixing portion, and the spring deformation portion connecting the outer fixing portion and the inner fixing portion of the second plate spring 40 are integrally formed.
The outer fixing portion of the second plate spring 40 is fixed to the lower surface (lower end surface facing the Z2 side) of the leg portion 23 formed downward at the 4 position of the movable base 21, and the inner fixing portion is fixed to the lower surface 25b of the lens holder 25 as shown in fig. 4.
The lens holder 25 is vertically supported by the first plate spring 30 and the second plate spring 40, and is supported to be movable in the extending direction of the central axis O (the optical axis direction of the lens) with respect to the movable base 21.
As shown in fig. 3, a metal base 12 is embedded in a base 11 made of synthetic resin, and the metal base is divided into two parts as described above. Support holes 13 formed by long holes are formed in the respective corners of the metal base 12 divided into two parts, and the base end portions 8a of the suspension wires 8 are fixed by brazing through the support holes 13.
As shown in fig. 3 and the like, in the movable unit 20, a part of the first plate spring 30 protrudes from each corner of the movable base 21 having a quadrangular shape. A support hole 36 is formed in the protruding portion of the first plate spring 30, the front end portion 8b of the suspension wire 8 is inserted into the support hole 36, and the suspension wire 8 and the first plate spring 30 are fixed by brazing. The movable unit 20 is supported movably in a direction intersecting the central axis O (a direction intersecting the optical axis of the lens) by elastic deformation of the suspension wire 8.
One end portion of the wire constituting the first coil 51 is soldered to one of the divided spring portions 31 of the first plate spring 30, and the other end portion of the wire is soldered to the other divided spring portion 31 of the first plate spring 30.
As shown in fig. 4, the movable unit 20 is provided with a metal member 60. The metal member 60 is formed of a magnetic metal plate, and functions as a yoke constituting a magnetic circuit of the axial driving mechanism 50 and the cross-axis driving mechanism 70. The metal member 60 has four side plate portions 63, and the magnet 52 is fixed to the inside of the side plate portions 63 with an adhesive or the like. Therefore, the metal member 60 is also a magnet holding member that holds the magnet 52. Although not shown, a coating film or a sheet-like insulating layer is provided between the metal member 60 and the first leaf spring 30. Therefore, the two divided spring portions 31 are not conducted by the metal member 60.
As shown in fig. 4, the axial driving mechanism 50 for moving the lens holder 25 in the optical axis direction is composed of the first coil 51 wound around the outer periphery of the lens holder 25, the magnet 52, and the metal member 60.
As shown in fig. 3 and 4, an axis-crossing drive mechanism 70 is provided above the base 11. The cross-axis driving mechanism 70 is constituted by four second coils 71 provided on the base 11, the magnet 52, and the metal member 60. Therefore, the shaft cross drive mechanism 70 is provided in the base structure portion 10 and the movable unit 20. The axis-crossing driving mechanism 70 is a driving mechanism that moves the movable unit 20 in a direction crossing the optical axis direction. In the present embodiment, the metal member 60 is formed of a metal plate having magnetic properties, but the metal member as the magnet holding member may be formed of a non-magnetic metal plate or a synthetic resin material. In this case, the metal member 60 does not constitute the shaft cross drive mechanism 70. That is, the intersecting axis driving mechanism 70 that moves the movable unit 20 in the direction intersecting the optical axis direction is configured to include at least the magnet 52 and the second coil 71. Similarly, in a case where the metal member 60 is not formed of a metal plate having magnetism, the axial driving mechanism 50 includes a first coil 51 and a magnet 52 disposed outside the first coil 51.
Each of the second coils 71 is formed in an elongated planar winding pattern, and has an outer electromagnetic operating portion 71a located at a position distant from the center axis O and an inner electromagnetic operating portion 71b located at a position close to the center axis O. In the outer electromagnetic operating portion 71a and the inner electromagnetic operating portion 71b, the current flows linearly in a direction parallel to the lower end portion 52d of the magnet 52 and the lower end 63a of the side plate portion 63. Positioning projections 14 are integrally formed at a plurality of positions on the upper surface of the base 11, the winding hollow portion of the second coil 71 is fitted into the positioning projections 14 to be positioned, and the second coil 71 and the base 11 are fixed by an adhesive.
As shown in fig. 4, when the movable unit 20 is attached to the base 11 via the suspension wire 8, the lower end 52d of the magnet 52 is placed opposite to the middle between the outer electromagnetic operating portion 71a and the inner electromagnetic operating portion 71b of the second coil 71, and the lower end 63a of the side plate portion 63 of the metal member 60 is placed opposite to and directly above the outer electromagnetic operating portion 71 a.
As shown in fig. 4, a position detection element 73 is provided on the base 11 below the second coil 71. The position detection element 73 is a hall element or a magnetoresistive effect element. At least two position detection elements 73 are provided, one of which faces the lower side of the magnet 52 extending in the X direction, and the other of which faces the lower side of the magnet 52 extending in the Y direction.
As shown in fig. 3, the lens driving device 1 is provided with a cover 2 covering the movable unit 20. The cover 2 is formed of a rolled steel plate, a stainless steel plate, or the like. The cover 2 has a cubic shape, and four side plates 2a are integrally formed with a top plate 2b positioned above (in the Z1 direction). A circular window 2c for transmitting light is opened in the top plate 2 b.
As shown in fig. 4, the lower edge portion 2d of each side plate 2a abuts on the upper surface of the base 11 provided on the base structure portion 10, and the base 11 and the cover 2 are fixed by an adhesive or the like.
Next, the operation of the lens driving device 1 having the above-described structure will be described.
The metal base 12 divided from each other of the lens driving device 1 → each suspension wire 8 → each divided spring portion 31 of the first plate spring 30 → both end portions of the lead wire of the first coil 51 become independent current carrying paths through which a control current is supplied to the first coil 51 constituting the axial driving mechanism 50. That is, the suspension wire 8 constitutes a current-carrying path for carrying current to the first coil 51.
When a control current is applied to the first coil 51 constituting the axial drive mechanism 50, the lens holder 25 moves along the central axis O in the movable unit 20 by the control current and the magnetic field generated by the magnet 52. An imaging element is provided behind the base structure portion 10 (in the Z2 direction), and focusing is performed on the imaging element by the movement of the lens holder 25 along the central axis O.
A control current is supplied to the second coil 71 constituting the axis-crossing driving mechanism 70 from a conductor pattern (not shown) formed on the surface of the base 11. As shown in fig. 4, the movable unit 20 is driven in a direction intersecting the central axis O by the magnetic flux Φ from the first magnetized surface 52a of the magnet 52 to the lower end 63a of the side plate portion 63 and the control current flowing through the second coil 71. The second magnetized surface 52b of the magnet 52 is fixed to the side plate 63 by an adhesive or the like.
The amount of movement of the movable unit 20 in the direction intersecting the center axis O is detected by the position detection element 73, and the detection output is fed back to control the amount of current of the control current applied to the second coil 71. The camera shake correction and the like at the time of shooting are performed by this control operation.
The suspension wire 8 supporting at least a part of the movable unit 20 is formed of a Cu-based shape memory alloy of a martensite phase, and therefore can exert elasticity and a vibration damping function. Therefore, when the movable unit 20 is driven in the direction intersecting the central axis O by the axis intersection driving mechanism 70, it is possible to suppress the generation of unnecessary vibrations such as higher order resonance.
To operate the axial drive mechanism 50, a control current to be applied to the first coil 51 is supplied to the suspension wire 8. The current value at this time is about 50 to 100mA, and the resistance value of the suspension wire 8 is about 0.05 to 0.1 omega. Therefore, the joule heat when the power is supplied to the suspension wire 8 is not so high, and the shape memory alloy constituting the suspension wire 8 does not change from the martensite phase to the austenite phase when the lens drive device 1 operates.
Further, the transition temperature at which the shape memory alloy constituting the suspension wire 8 is transformed from the martensite phase to the austenite phase is set higher than the use limit temperature at which the magnets 52 constituting the axial direction driving mechanism 50 and the cross-axis driving mechanism 70 are heated to be irreversibly demagnetized.
The use limit temperature of the lens driving device 1 is a temperature at which the magnet 52 falls into a state of irreversible demagnetization, and when the use limit temperature is exceeded, the axial driving mechanism 50 and the axial cross driving mechanism 70 cannot operate. However, the use limit temperature is a high temperature exceeding 100 ℃, and the magnet 52 hardly falls into irreversible demagnetization in a normal use environment. In the lens driving device 1, by setting the transition temperature of the shape memory alloy to be higher than the use limit temperature, the suspension wire 8 is not transformed into the austenite phase in a normal use environment, and an appropriate elastic support force and vibration damping effect can be always exerted.
Claims (4)
1. A lens driving device is provided with a base, a movable unit capable of mounting a lens body, a support member for supporting the movable unit on the base, and a driving mechanism for moving the movable unit in a direction intersecting with an optical axis direction,
it is characterized in that the preparation method is characterized in that,
the support member is a suspension wire that connects the base and the movable unit and is deformable in a direction intersecting the optical axis direction, the suspension wire being formed of a shape memory alloy of a martensite phase,
the suspension wire supports the movable unit to be movable in a direction intersecting the optical axis direction,
the movable unit is provided with a lens holder, a first coil for moving the lens holder in the optical axis direction, and a magnet, the suspension wire is a current path for supplying current to the first coil,
the suspension wire also maintains the state of the martensite phase during energization.
2. The lens driving device according to claim 1,
the suspension wire is formed of a Cu-based shape memory alloy.
3. The lens driving device according to claim 1,
the suspension wires maintain a straight shape also in a state of being transformed into an austenite phase.
4. The lens driving device according to claim 1,
the temperature at which the magnet provided in the drive mechanism becomes irreversible demagnetization is lower than the transition temperature at which the suspension wire is transformed into the austenite phase.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016024652A JP6626729B2 (en) | 2016-02-12 | 2016-02-12 | Lens drive |
| JP2016-024652 | 2016-02-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107085275A CN107085275A (en) | 2017-08-22 |
| CN107085275B true CN107085275B (en) | 2020-04-10 |
Family
ID=59615278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710046917.9A Active CN107085275B (en) | 2016-02-12 | 2017-01-19 | Lens driving device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6626729B2 (en) |
| CN (1) | CN107085275B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110275268B (en) * | 2018-03-14 | 2024-04-30 | 新思考电机有限公司 | Lens driving device, camera device and electronic apparatus |
| CN112612099A (en) * | 2019-09-18 | 2021-04-06 | 华为技术有限公司 | Focusing driving device and electronic equipment comprising same |
| CN117845731B (en) * | 2024-03-06 | 2024-05-14 | 上海路博减振科技股份有限公司 | Three-dimensional vibration-proof impact-isolating device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893748A (en) * | 2009-05-19 | 2010-11-24 | 三美电机株式会社 | Lens driver, charging method and SMA assembly |
| CN204215089U (en) * | 2014-09-18 | 2015-03-18 | 大立光电股份有限公司 | Lens driving device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101452099B (en) * | 2007-11-29 | 2010-06-09 | 群光电子股份有限公司 | Active device with shape memory alloy |
| CN101482642B (en) * | 2008-01-08 | 2010-09-29 | 群光电子股份有限公司 | Action apparatus with shape memory alloy |
| KR101044219B1 (en) * | 2009-10-19 | 2011-06-29 | 삼성전기주식회사 | Lens actuating module |
| KR101148581B1 (en) * | 2010-11-03 | 2012-05-29 | 삼성전기주식회사 | Image photographing device having function for compensation hand vibration |
| CN108594400A (en) * | 2012-02-24 | 2018-09-28 | 惠安县云点网络科技有限公司 | A kind of auto-focusing imaging method |
-
2016
- 2016-02-12 JP JP2016024652A patent/JP6626729B2/en active Active
-
2017
- 2017-01-19 CN CN201710046917.9A patent/CN107085275B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893748A (en) * | 2009-05-19 | 2010-11-24 | 三美电机株式会社 | Lens driver, charging method and SMA assembly |
| CN204215089U (en) * | 2014-09-18 | 2015-03-18 | 大立光电股份有限公司 | Lens driving device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107085275A (en) | 2017-08-22 |
| JP2017142424A (en) | 2017-08-17 |
| JP6626729B2 (en) | 2019-12-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5513834B2 (en) | Lens drive device | |
| US9723211B2 (en) | Camera module with image stabilization by moving imaging lens | |
| US8681227B2 (en) | Photography device having anti-shake function | |
| EP4224233A1 (en) | Linear ball guided voice coil motor for folded optic | |
| JP5348230B2 (en) | Lens drive device | |
| US7391579B2 (en) | Minature zoom lens | |
| JP5007373B1 (en) | Lens drive device | |
| KR101523779B1 (en) | Lens driving apparatus | |
| JP2012505433A (en) | Compound drive lens actuator | |
| US20210294070A1 (en) | Lens driving apparatus and camera module | |
| JP2006074990A (en) | Actuator for auto focusing | |
| KR20080105988A (en) | Camera module | |
| CN107085275B (en) | Lens driving device | |
| US10852458B2 (en) | Camera device | |
| JP2017067908A (en) | Lens drive device | |
| JP2017067909A (en) | Lens drive device | |
| CN108072962B (en) | Lens driving device | |
| JP5827923B2 (en) | Lens drive magnetic circuit | |
| CN110873938B (en) | Lens apparatus and camera system having the same | |
| JP3916628B2 (en) | LENS DRIVE DEVICE AND IMAGING DEVICE | |
| JP6549020B2 (en) | Lens drive | |
| JP4527051B2 (en) | LENS DRIVE DEVICE AND IMAGING DEVICE | |
| JP2021175989A (en) | Lens drive device and camera module | |
| JP6278664B2 (en) | Lens drive device | |
| JP7378287B2 (en) | Lens drive device and camera module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: Tokyo, Japan, Japan Applicant after: Alpine Alpine Company Address before: Tokyo, Japan, Japan Applicant before: Alps Electric Co., Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |