JP2009229789A - Lens displacement mechanism for automatic focus or zoom lens module - Google Patents

Lens displacement mechanism for automatic focus or zoom lens module Download PDF

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Publication number
JP2009229789A
JP2009229789A JP2008074929A JP2008074929A JP2009229789A JP 2009229789 A JP2009229789 A JP 2009229789A JP 2008074929 A JP2008074929 A JP 2008074929A JP 2008074929 A JP2008074929 A JP 2008074929A JP 2009229789 A JP2009229789 A JP 2009229789A
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Japan
Prior art keywords
lens
coil
displacement mechanism
electromagnet
electromagnets
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Pending
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JP2008074929A
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Japanese (ja)
Inventor
Shr-Bin Wu
Tengjian You
詩斌 呉
騰健 游
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E-Pin Optical Industry Co Ltd
一品光学工業股▲ふん▼有限公司
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Application filed by E-Pin Optical Industry Co Ltd, 一品光学工業股▲ふん▼有限公司 filed Critical E-Pin Optical Industry Co Ltd
Priority to JP2008074929A priority Critical patent/JP2009229789A/en
Publication of JP2009229789A publication Critical patent/JP2009229789A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens displacement structure for automatic focus enduring reflow temperature. <P>SOLUTION: This lens displacement mechanism employs an electromagnet having thermal resistance as a magnet for driving an automatic focus lens. A lens module 1 stores the lens displacement mechanism 3 and a lens 2 formed of a lens piece group 21 and a lens holder 22 between an upper lid 11 and a bottom lid 12. A coil 31 is fixed to the lens side of the lens displacement mechanism, and can be slid by a return spring 38, electromagnets 321-324 for drive are arranged on its outer periphery, and a coil-side lens is slid and driven. By individually controlling current carrying to each electromagnet, the excursion operation of the lens can be performed, and a shake-prevention mechanism can be provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lens displacement mechanism for an autofocus or zoom lens module, and more particularly to a lens displacement mechanism that drives a lens by an electromagnetic force generated between the coil and an electromagnet to perform a slide displacement.

  In a digital camera, a mobile phone with a photographing function, a portable electronic device such as a notebook computer, and the like equipped with a compact camera module capable of performing autofocus or zoom operation, the CCM is between the top cover and the bottom cover. And a housing that is installed in the housing and can be slid back and forth in the direction of the central axis. The lens is composed of a lens piece group and a lens holder, and the lens is driven to generate a longitudinal displacement operation on the central axis. It consists of what is called a lens displacement mechanism or actuator used to achieve the focus or zoom effect.

  The lens displacement mechanism often seen has various designs, for example, piezoelectric motors, which are formed using the principle of piezoelectric materials, such as US7212358, US2003 / 0227560, JP2006-293083, JP2006-101611, etc. The piezoelectric material used cannot withstand the high temperature (about 260 ° C.) of the reflow operation, and the special piezoelectric material that can withstand the high temperature is very expensive, which is disadvantageous for mass production or cost reduction. The so-called voice coil motor is composed of a coil, a magnet, and an elastic member, and includes, for example, US Pat. For example, in FIG. 1, one or several permanent magnets 70 are arranged in an annular shape on the inner or outer periphery of the coil 31, and the coil 31 is energized to form the permanent magnet 70. An electromagnetic force is generated upward or downward in the applied magnetic field to drive the movement of the lens. However, the permanent magnet attenuates the magnet when the reflow temperature is high. Therefore, when combining the above-described conventional piezoelectric motor and VCM, the reflow method cannot be used, and mass production efficiency is limited. Another type of lens displacement mechanism using SMA (Shaped Memory Alloy) is a driving force source using the characteristics of thermal compression / cooling / expansion of SMA. However, the operation of SMA thermal compression cooling expansion is relatively slow and the immediate autofocus or zoom effect cannot be easily achieved.

  For users who require high image quality, in order to maintain excellent behavior and shooting quality in a low-light environment, the camera shake prevention function is given considerable importance. In the prior art, the image stabilization technique is achieved by several methods, for example, reducing the influence of image blur caused during the vibration process by the compensating movement of the imaging unit (CCD) by the mechanical support, or the lens. The mechanical structure provided by the system eliminates camera shake or calculates software compensation, or improves the sensitivity capability, or uses two gyroscopes to measure horizontal and vertical vibrations of the CCD and uses magnetic force propulsion For example, there are EP 1729509, US20070292119, US20070009243, JP08122840, JP1130280, JP11220651, and the like.

Using electromagnetic force as the main power source of the range displacement mechanism has convenience and versatility, the magnetic force is not destroyed at reflow high temperature (about 260 ° C), special materials are used, and high temperature resistance This permanent magnet cannot be widely used because of its high price and low magnetic force. Therefore, there is still an urgent need to develop new technologies and solve the reflow problem of lens displacement mechanisms.
JP2007-121701A

  The present invention uses a coil and an electromagnet arranged around the coil, and the coil is fixed to the outer periphery of the lens, and is coupled to the lens as a lens interlocking body that slides and displaces in the same step. The electromagnet includes a plurality of electromagnets. And is fixed so as not to move in the lens module, so that after the coil and the electromagnet set respectively input current, the lens is driven by the electromagnetic force generated between the coil and the electromagnet set, and the central axis It is an object of the present invention to provide a lens displacement mechanism capable of sliding displacement back and forth in a direction. This structure can withstand the high temperature of reflow, can be mass-produced, and does not cause the difficulty of using a reflow process using a conventional permanent magnet.

  According to the present invention, an electromagnet set is composed of a plurality of electromagnets, and controls the magnitude of current or the direction of current of each electromagnet so as to have a function of receiving different electromagnetic forces after energization of a coil. It is an object of the present invention to provide a lens displacement mechanism that generates a deviation angle in the central axis of the lens and is aimed at a subject to be photographed to achieve an autofocus or zoom effect for preventing camera shake.

  The present invention further provides a recovery force corresponding to the lens holder when the spring is disposed on the lens holder and the electromagnetic force between the coil and the electromagnet set disappears or does not cause an action. It is an object of the present invention to provide a lens displacement mechanism for returning a lens holder to an equilibrium state or an original position.

The lens displacement mechanism of the present invention is applied to an autofocus or zoom lens module, and the lens module includes at least one housing, a lens, and a lens displacement mechanism, and the lens includes a lens piece group and a lens holder. The lens displacement mechanism is an electromagnet set that is disposed on the outer periphery of the coil relative to the coil. Among them, the coil is fixed to the outer periphery of the lens and becomes an interlocking body that is coupled to the lens and slide-displaced in the same step. The electromagnet set is composed of a plurality of electromagnets and does not move in the lens module. Thus, after the coil and the electromagnet set each input current, the coil And the lens is driven by an electromagnetic force generated between the electromagnet sets can be slid displaced in axial direction.

Compares the structural design of the present invention with the prior art and has at least the following advantages:
<1> The lens displacement mechanism 3 of the present invention can be replaced with a permanent magnet using an electromagnet, can withstand a high temperature of reflow, and can improve the possibility of mass production.
<2> The lens displacement mechanism 3 of the present invention can independently control each electromagnet in the electromagnet set 32 and can be provided with a camera shake preventing function.

The embodiments disclosed below of the present invention describe the components of the lens displacement mechanism, but do not limit the structure of the other components of the lens module, that is, the other components of the lens module may vary. For example, the shape of the housing of the lens module is not limited. The shape or structure of the lens (lens piece group and lens holder) is not limited, and the lens piece group may be a single lens piece or a plurality of lens pieces, and the lens piece group is accommodated in a fixing member. The lens holder can be combined to form one lens. The coil of the present invention has no limitation on the number of individual coils of the electromagnet set, the coil inner diameter (or the cut-off area of the coil inner diameter), the coil temperature, the thickness of the electromagnet coil, or the current traveling direction and size, etc. It can be calculated based on Savart's law and Ampere's law, and the calculation formulas are the following formulas (1) and (2).
Where B is the magnetic flux density, μ 0 is the vacuum magnetic permeability (permeability), I is the coil current (Amp), l is the length of the coil, r is the distance, and F is the force applied Is the size of Equations (1) and (2) can calculate the magnetic flux density of the electromagnet of the present invention and the magnitude of the force received by the coil, respectively, and design a suitable driving force according to the weight of the lens. Can do.

2 and 3, the lens displacement mechanism 3 of the present invention includes a coil 31 and an electromagnet set 32, and the coil 31 is fixed on the lens holder 22 of the lens 2 and interlocked with the lens piece group 21. Configure the body and move in the same step.
The electromagnet set 32 includes a plurality of, for example, four electromagnets 321 to 324 and is fixed so as not to move. In use, a controller (see FIG. 4), for example, a controller of a digital camera outputs currents of different directions (inflow or outflow) or different magnitudes to the coil 31 and the electromagnet set, and the electromagnet set by electromagnetic action. Magnetic poles are generated on the end faces of the 32 electromagnets 321 to 324, and after the coil 31 is energized, an electromagnetic force is generated according to Ampere's law, and the magnitude and direction of the electromagnetic force received by the coil 31 are calculated. Is moved along the lens central axis Z to achieve an autofocus or zoom effect.

  The lens displacement mechanism 3 of the present invention can control the magnitude or direction of current flowing through the electromagnets 321 to 324, controls the magnitude of magnetic force (electromagnetic strength) generated by each electromagnet, Different electromagnetic forces between the electromagnets, for example, 321 to 324, are affected by an electromagnetic force that is not balanced, and the angle is shifted between the optical axis of the lens 2 and the lens central axis Z. Can be aimed at.

  The electromagnet core 36 of the electromagnet set 32 is made of ferrite. Ferrite has the property of being easily magnetized and easily demagnetized. It is very easy to be magnetized after energization of the electromagnet set 32, and the magnetic field lines can be concentrated on the end face of the electromagnet core 36. The magnetic force of the core 36 also disappears immediately, that is, the ferrite itself does not retain the ability of magnetization. Current ferrite materials include high purity iron (pure iron, soft iron), low carbon steel, silicon, iron-nickel alloy (Fe-Ni Alloy or Permalloys), magnesium zinc alloy (Mg-Zn alloy), nickel zinc alloy, manganese zinc An alloy, a metal amorphous, or the like, which can withstand the high temperature of reflow and can be selected according to the purpose.

  In the lens displacement mechanism 3 according to the present invention, a spring 38 having an elastic function is further disposed on the lens 2, and when the electromagnetic force between the coil 31 or the electromagnet 32 disappears, the spring 38 exerts an electromagnetic force on the lens 2. Provides the opposite elastic force to return the lens to its original position. Further, the elastic form of the spring 38, for example, a compression spring or an extension spring, a structural form, for example, a coil spring or a non-coil spring, the number, or the installation position is not limited, and the design of the lens module 2 is not limited. It can be changed according to the necessity or the direction of movement of the coil 31.

<First embodiment>
2 and 3, the present embodiment is a lens displacement mechanism 3 having four electromagnets 321 to 324, and can be applied to an autofocus or zoom lens module 1 of a small digital camera. It is a 10 mm × 10 mm rectangular module, and includes a housing formed by at least the top lid 11 and the bottom lid 12, and the lens 2 can be slid in the central axis Z direction in the housing. That is, the lens 2 includes a lens piece group 21 and a lens holder 22 to form a moving body in the same step, and is installed in the housing to move forward (object side direction) or backward (image side) on the central axis Z. Direction).

The lens displacement mechanism 3 includes a coil 31, an electromagnet set 32, a pair of conductive pieces 33, a coil electrode 34, and an electromagnet electrode 35. The coil 31 is fixed on the lens holder 22 of the lens 2. The lens 2 and the interlocking body are configured and moved in the same step. The electromagnet set 32 includes four electromagnets 321, 322, 323, and 324 and is fixed so as not to move. The controller of the digital camera (for example, the controller 37 of FIG. 4) outputs currents (inflow or outflow) in different directions or different magnitudes, and the electromagnet electrode 35 has four electromagnet electrodes 351, 352, 353, and 354. To the electromagnets 321 to 324 of the electromagnet set 32.
The four electromagnets 321 to 324 of the present embodiment are arranged and fixed on the outer periphery of the coil 31 evenly at intervals of 90 degrees. The controller 37 outputs currents (I 1 , I 2 , I 3 , I 4 ), energizes the electromagnets 321-324 via the electromagnet electrodes 351-354, and electromagnets 321-324 by electromagnetic action. N-pole or S-pole magnetic force is generated in the magnetic core 36, and the magnitude and direction of the magnetic force are controlled by the magnitude and direction of the input current. In this embodiment, the N poles of the magnetic core 36 corresponding to the magnetic forces of the four electromagnets 321 to 324 are all along the central axis Z direction of the lens. Moreover, in order to make the electromagnetic efficiency of the electromagnet set 32 the strongest, silicon iron is used for the magnetic cores 36 of the four electromagnets 321 to 324.

  The controller 37 outputs a current I and supplies power to the coil 31 via the conductive piece 33 connected to the coil electrode 34. When the direction of the current (I) is counterclockwise, the coil 31 receives electromagnetic force in the upward direction (object side direction) according to Ampere's law, and moves the lens 2 upward along the lens central axis Z. . When the direction of the current I is a clockwise direction, the coil 31 receives an electromagnetic force in the downward direction (image side direction) and moves the lens 2 downward along the lens central axis Z, thus Move the lens to achieve the aim of aiming.

When the controller 37 cuts off the output of the current I, the coil 31 does not generate a magnetic field, is not affected by electromagnetic force, and the lens 2 does not move. Alternatively, when the controller 37 cuts off the outputs of the currents I 1 , I 2 , I 3 , and I 4 , the electromagnets 321 to 324 generate no magnetic force and the lens 2 does not move. The table below is a reference for the direction and magnitude of the current used in this example:

  The spring 38 used in this embodiment is a compression type coil spring composed of a spring, and is disposed between the lens holder 22 and the upper lid 11. When the coil 31 passes an electric current and moves the lens 2 upward, The spring 38 is compressed and deformed. After the current of the coil 31 is cut off, the upward electromagnetic force disappears, and the spring 38 is not compressed and automatically returns to its original state, and pushes the lens 2 back to its original position.

<Second embodiment>
Referring to FIG. 6, the present embodiment is a lens displacement mechanism 3 having three electromagnets 321 to 323, and can be applied to an autofocus or zoom lens module 1 of a small digital camera. The lens module 1 is a circular module having a diameter of 8 mm, and the structure is the same as that of the first embodiment. The electromagnet set 32 of the present embodiment is composed of three electromagnets 321 to 323, and is equally disposed on the outer periphery of the coil 31 at intervals of 120 degrees and fixed so as not to move. When the controller 37 outputs current (I 1 , I 2 , I 3 , I 4 ), energizes each electromagnet 321-323 to output current I, and energizes the coil 31, the coil 31 faces upward ( The lens 2 is moved upward along the lens central axis Z in response to the electromagnetic force in the object side direction). If the controller 37 cuts off the output of current, the coil 31 does not receive electromagnetic force. Table 2 below is a reference for the direction and magnitude of the current used in this example:

<Third embodiment>
2 and 5, the present embodiment can be applied to the autofocus or zoom module 1 as the lens displacement mechanism 3 of the camera having a camera shake prevention function.
The structural form is the same as that of the first embodiment, but the electromagnetic forces of the four electromagnets 321 to 324 of the electromagnet set 32 of the present embodiment can be further controlled independently, for example, , N pole can be controlled in the direction of the central axis Z of the lens, and one of the electromagnets can be controlled independently with the S pole as the direction of the central axis Z of the lens. The electromagnet core 36 of the four electromagnets 321 to 324 used in the present embodiment is made using an iron nickel alloy, and the magnetic conductivity of the iron nickel alloy is low and has high electromagnetic sensitivity. On the other hand, when a current that is rapidly converted is passed, a rapid electromagnetic force can be reacted, and the magnitude of the electromagnetic force of each electromagnet can be independently controlled. Referring to FIG. 5, the electromagnets 321 and 323 correspond to an orientation of 180 degrees with each other. When the user shakes the digital camera upward, the object to be photographed shifts from the central axis Z of the lens, It moves in the axial direction to supplement the amount of vibration. At this time, the controller 37 applies different currents to the electromagnets 321 and 323, for example, applies a small current to the electromagnet 321, and increases a large current to the electromagnet 323. At this time, the coil 31 receives different electromagnetic forces between the electromagnets 321 and 323, causes the optical axis of the lens 2 to correspond, generates a shift of the angle θ in the direction of the received force, Aim at the object to achieve the purpose of preventing camera shake. Table 3 below is a reference example of the direction of current and the magnitude of the current used in this example:

Further, at this time, the controller 37 can flow currents in different directions to the electromagnets 321 and 323 so that quick control can be performed. For example, the electromagnet 321 applies current in the counterclockwise direction, and the electromagnet 323. Applies a current in the clockwise direction. At this time, the coil 31 receives electromagnetic forces of the electromagnets 321 and 323 in different directions, generates a deviation angle θ in the optical axis of the lens 2, and achieves the purpose of quick control for preventing camera shake toward the object. Table 4 is an example of the direction of current used and the magnitude of the current.

In the present invention, the preferred embodiments have been disclosed as described above, but these are not intended to limit the present invention in any way, and anyone who is familiar with the technology can make an equivalent scope without departing from the spirit and scope of the present invention. Of course, various fluctuations and hydration colors can be added.

It is explanatory drawing of the conventional lens displacement mechanism. It is a three-dimensional decomposition explanatory drawing of 1st Example of this invention. It is explanatory drawing of this invention. It is focus explanatory drawing of this invention. It is explanatory drawing of the camera shake prevention of this invention. It is a three-dimensional decomposition explanatory drawing of 2nd Example of this invention.

Explanation of symbols

<Conventional technology>
DESCRIPTION OF SYMBOLS 1 Lens module 11 Top cover 12 Bottom cover 2 Lens 21 Lens piece group 22 Lens holder 3 Lens displacement mechanism 31 Coil 32 Electromagnet set 321-324 Electromagnet 33 Conductive piece 34 Coil electrode 35 Electromagnet electrode 351-354 Electromagnet electrode 36 Electromagnet ferrite 37 Controller 38 Spring 70 Permanent magnet

Claims (6)

  1. It consists of a lens housed in a housing and a lens displacement mechanism,
    The lens includes a lens piece group and a lens holder, and is a lens displacement mechanism that is arranged in a housing and can perform slide displacement in a direction approaching or separating from a subject on a central axis,
    The lens displacement mechanism is composed of a coil and an electromagnet set disposed on the outer periphery of the coil relative to the coil, and the coil is coupled to the lens and coupled to the lens to slide and displace in the same step. The electromagnet set is composed of a plurality of electromagnets, fixed so as not to move in the lens module, and is generated between the coil and the electromagnet set when current is supplied to the coil and the electromagnet set, respectively. A lens displacement mechanism for an auto focus or zoom lens module, wherein the lens is driven by electromagnetic force to slide and displaced in the direction of the central axis.
  2. 2. The autofocus or zoom lens module according to claim 1, wherein the electromagnets of the electromagnet set are equally arranged on the outer periphery of the coil at an equal angle, and one end surface of each electromagnet core is disposed relative to the lens central axis. Lens displacement mechanism.
  3. 2. A lens displacement mechanism for an autofocus or zoom lens module according to claim 1, wherein the forward or backward movement for driving the slide displacement in the central axis direction of the lens is controlled by the direction of the current input to the coil.
  4. 2. The lens displacement mechanism for an autofocus or zoom lens module according to claim 1, wherein the plurality of electromagnets further controls an angle between the lens optical axis and the central axis of the lens module by currents having different sizes or directions.
  5. 2. The lens auto according to claim 1, further comprising a spring disposed on the lens, wherein when the electromagnetic force of the coil and the electromagnet set disappears, the spring provides a restoring force to the lens to return the lens to its original position. Lens displacement mechanism for focus or zoom lens module.
  6. The lens displacement mechanism for a zoom lens module according to claim 1, wherein the spring can be a compression spring or an extension spring.
JP2008074929A 2008-03-24 2008-03-24 Lens displacement mechanism for automatic focus or zoom lens module Pending JP2009229789A (en)

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Cited By (7)

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WO2011062123A1 (en) * 2009-11-18 2011-05-26 日本電産サンキョー株式会社 Lens drive device
JP2011107470A (en) * 2009-11-18 2011-06-02 Nidec Sankyo Corp Lens driving device
JP2011113009A (en) * 2009-11-30 2011-06-09 Nidec Sankyo Corp Lens drive device
KR101085645B1 (en) 2010-10-04 2011-11-22 삼성전기주식회사 Image photographing device having function for compensation hand vibration
KR101214708B1 (en) 2010-12-14 2012-12-21 엘지이노텍 주식회사 Camera Module
CN104898347A (en) * 2014-03-07 2015-09-09 磁化电子株式会社 Camera lens module
JP2018116295A (en) * 2009-11-17 2018-07-26 台湾東電化股▲ふん▼有限公司 Lens drive device

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Publication number Priority date Publication date Assignee Title
JP2018116295A (en) * 2009-11-17 2018-07-26 台湾東電化股▲ふん▼有限公司 Lens drive device
US9042042B2 (en) 2009-11-18 2015-05-26 Nidec Sankyo Corporation Lens drive device
JP2011107470A (en) * 2009-11-18 2011-06-02 Nidec Sankyo Corp Lens driving device
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CN104898347A (en) * 2014-03-07 2015-09-09 磁化电子株式会社 Camera lens module

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