WO2015178081A1 - カメラモジュールおよびカメラモジュールの製造方法 - Google Patents
カメラモジュールおよびカメラモジュールの製造方法 Download PDFInfo
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- WO2015178081A1 WO2015178081A1 PCT/JP2015/057898 JP2015057898W WO2015178081A1 WO 2015178081 A1 WO2015178081 A1 WO 2015178081A1 JP 2015057898 W JP2015057898 W JP 2015057898W WO 2015178081 A1 WO2015178081 A1 WO 2015178081A1
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- Prior art keywords
- joint
- suspension wire
- axis
- camera module
- flexible
- Prior art date
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- 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
-
- 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
- G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
-
- 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
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- 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
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
-
- 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
-
- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
- H04N23/682—Vibration or motion blur correction
- H04N23/685—Vibration or motion blur correction performed by mechanical compensation
- H04N23/687—Vibration or motion blur correction performed by mechanical compensation by shifting the lens or sensor position
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- 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
Definitions
- the present invention relates to a camera module mounted on an electronic device such as a mobile phone, and more particularly to a camera module having a camera shake correction function.
- a camera module of a type that exhibits an autofocus (AF) function by a lens driving device is mounted on an electronic device such as a mobile phone.
- lens drive devices that use stepping motors, types that use piezoelectric elements, and types that use VCM (Voice Coil Motor: voice coil motor). ing.
- Patent Literature 1 describes a “barrel shift type” camera shake correction device.
- This “barrel shift method” which displaces the entire lens in a direction perpendicular to the optical axis, is relatively compact and has excellent performance. Mainly used as a correction method.
- the camera module of Patent Document 1 has a suspension wire in which one end is fixed to a part (base) on the image pickup element side of the camera module and the other end is fixed to a part (extension part) on the lens barrel side of the camera module.
- the imaging element has a light receiving surface on the lens barrel side.
- the optical axis of the lens barrel extends in a direction generally perpendicular to the light receiving surface of the image sensor.
- the suspension wire is fixed as described above, thereby restricting the moving direction of the lens barrel to a direction perpendicular to the optical axis.
- the extension part functions as a breakage prevention member that prevents breakage of the suspension wire.
- FIG. 10A and 10B are cross-sectional views showing the breakage preventing member 101 of the suspension wire 102 of the conventional camera module, in which FIG. 10A shows a state in which no force acts on the suspension wire 102, and FIG. A state in which a force F in the positive axial direction is applied.
- the Z axis extends in the optical axis direction of the optical system of the camera module.
- the X axis and the Y axis extend in a direction perpendicular to the optical axis and are orthogonal to each other.
- the breakage preventing member 101 is provided with a hole 101a.
- the suspension wire 102 is inserted into the hole 101a.
- the breakage preventing member 101 and the suspension wire 102 are mechanically and electrically joined by solder 103.
- the junction point P is the center of the hole 101a.
- the distal end portion 101A of the breakage preventing member 101 passes through the joint P and extends in a direction parallel to the Y axis. It inclines in the direction R of rotation as a center. At this time, the shear stress tends to concentrate on the boundary portion between the portion of the suspension wire 102 where the solder 103 is attached and the portion of the suspension wire 102 where the solder 103 is not attached. This increases the risk of breakage of the suspension wire 102.
- the present invention has been made in view of the above problems, and an object thereof is to provide a camera module with a low risk of suspension wire breakage.
- a camera module is a camera module having a camera shake correction function, and includes a movable part including an imaging lens, a fixed part surrounding the movable part, and the imaging
- a suspension wire that extends parallel or oblique to the optical axis of the lens, supports the movable part so that the movable part moves in a direction perpendicular to the optical axis, and has one end fixed to the fixed part;
- a flexible portion that suppresses the inclination of the joint portion around a second axis that is orthogonal to the first axis and connects the joint portion and the movable portion.
- a method for manufacturing a camera module includes a movable part including an imaging lens, a fixed part surrounding the movable part, and extending parallel or obliquely to the optical axis of the imaging lens.
- a suspension wire that supports the movable portion so that the movable portion moves in a direction perpendicular to the optical axis and has one end fixed to the fixed portion, and a joint portion to which the other end of the suspension wire is fixed.
- a camera module manufacturing method having a camera shake correction function, the step of designing a flexible part, the movable distance of the movable part, the cross-sectional area of the suspension wire and the spring constant, A step of calculating an elastic modulus of the flexible portion so that a stress obtained from a spring constant of the flexible portion is smaller than a buckling stress of the suspension wire; Centering on the inclination of the said joint part centering on the 1st axis
- the suspension wire is less likely to be broken by an impact (for example, a rapid movement due to the dropping of the camera module). That is, there is an effect that the risk of breakage of the suspension wire can be reduced.
- FIG. 4 is another cross-sectional view showing the configuration of the camera module shown in FIG. 1. It is sectional drawing which shows the structure which prevents the fracture
- FIG. 1 is a perspective view schematically showing a schematic configuration of the camera module 50 of the present embodiment.
- the XYZ axes shown in FIG. 1 also correspond to the coordinate axes of FIGS.
- FIG. 2 is a cross-sectional view showing the configuration of the camera module 50 shown in FIG.
- FIG. 2 is a cross-sectional view taken along the line AA in FIG.
- FIG. 3 is another cross-sectional view showing the configuration of the camera module 50 shown in FIG. 3A is a cross-sectional view taken along the line BB in FIG.
- FIG. 3B is an enlarged view of the main part C shown in FIG.
- FIG. 4 is a cross-sectional view showing a configuration for preventing the suspension wire 16 from being broken in the camera module 50 shown in FIG. 1.
- FIG. 4A shows a state in which no force acts on the suspension wire 16, and FIG. A state in which a force F in the positive direction of the Z-axis acts on the suspension wire 16 is shown.
- the state shown in FIG. 4A is, for example, an initial state.
- the state shown in FIG. 4B is a state in which the suspension wire 16 is pushed up in the positive direction of the Z axis by a drop impact or the like, for example.
- the camera module 50 includes an imaging lens 1, a lens barrel 2 that houses the imaging lens 1, and a lens holder 4 that fixes the lens barrel 2 using an adhesive 3.
- the camera module 50 also includes a lens driving device 5 for driving the imaging lens 1 in an optical axis direction (Z-axis direction) and a biaxial direction perpendicular to the optical axis (for example, X and Y axis directions), and an imaging lens.
- 1 includes an image sensor 6 that performs photoelectric conversion of light passing through 1, a substrate 7 on which the image sensor 6 is placed, a sensor cover 8 that covers the image sensor 6, and an image pickup unit 10 that includes a glass substrate 9. .
- the lens driving device 5 and the imaging unit 10 are stacked in the optical axis direction.
- the lens driving device 5 is covered with a cover 17.
- the imaging lens 1 side will be described as upward (Z-axis positive direction) and the imaging element 6 side will be described as downward (Z-axis negative direction).
- this does not define the vertical direction during use.
- the top and bottom may be reversed.
- the lens driving device 5 includes AF springs 12 a and 12 b, an intermediate holding member 13, an AF coil 14, a permanent magnet 15, a suspension wire 16, an OIS (Optical Image Stabilizer) coil 18, and a base 19.
- the lens holder 4 is supported so as to be driven in the optical axis direction with respect to the intermediate holding member 13 by two upper and lower AF springs (plate spring members) 12a and 12b.
- An AF coil 14 is fixed to the outer periphery of the lens holder 4.
- the intermediate holding member 13 is fixed with a dual-purpose permanent magnet 15 in which a permanent magnet for AF driving and a permanent magnet for camera shake correction are used in common, but two permanent magnets may be attached separately.
- the lens holder 4 has a protrusion 4 a that is in contact with the intermediate holding member 13 at a mechanical end on the infinity side in the movable range in the optical axis direction (a reference position on the imaging element 6 side of the movable range). Then, by controlling the AF coil 14, the lens holder 4 (and the imaging lens 1) can be driven in the optical axis direction. Thereby, an autofocus function can be realized.
- the intermediate holding member 13 is supported by the four suspension wires 16 with respect to the base 19 so as to be driven in a biaxial direction perpendicular to the optical axis direction.
- the suspension wire 16 is, for example, an elongated metal wire and extends parallel to the optical axis. Note that the longitudinal direction of the suspension wire 16 and the optical axis direction do not have to coincide with each other.
- the four suspension wires 16 may be arranged so as to be evenly and slightly inclined. That is, the suspension wire 16 may extend obliquely with respect to the optical axis.
- an OIS coil 18 is fixed to the base 19 so as to face the lower surface of the permanent magnet 15.
- the OIS coil 18, the intermediate holding member 13, the permanent magnet 15, the AF springs 12a and 12b, the lens holder 4, the AF coil 14, the lens barrel 2, the imaging lens 1, and the like are perpendicular to the optical axis. Can be driven integrally in any direction. Thereby, a camera shake correction function can be realized.
- a lens or the like is driven based on a camera shake signal detected by a gyro sensor or the like. At this time, feedback control is performed by detecting a displacement amount of the lens.
- the Hall element 21 is disposed in the vicinity of the OIS coil so as to face the permanent magnet 15, and the displacement of the permanent magnet 15 in the direction perpendicular to the optical axis, that is, the displacement of the imaging lens 1 can be detected. . Since two-axis camera shake correction is performed, two Hall elements are provided (not shown).
- the OIS movable portion 30 includes the imaging lens 1, the lens barrel 2, the lens holder 4, the AF springs 12a and 12b, the intermediate holding member 13, and the AF coil 14, and the OIS fixing portion includes the cover 17.
- An OIS coil 18, a base 19, and a Hall element 21 are included.
- a part of the lens barrel 2 enters the opening 19 a of the base 19 in a state where the lens barrel 2 is incorporated.
- the lens driving device 5 is mounted on the sensor cover 8.
- the sensor cover 8 is placed so that the reference surface formed at the tip of the protrusion 8 a is in contact with the image sensor 6 and covers the entire image sensor 6.
- An opening 8b is provided on the image pickup lens 1 side of the sensor cover 8, and the opening 8b is closed by a glass substrate 9 having an infrared cut function.
- the image sensor 6 is mounted on the substrate 7, and the sensor cover 8 and the substrate 7 are bonded and fixed in a state where a gap between the sensor cover 8 and the substrate 7 caused by tolerance is filled with the adhesive 20.
- the lens barrel 2 and the lens holder 4 are fixed by the adhesive 3 so that the lens barrel 2 is positioned at a predetermined position in a state where the lens holder 4 is positioned at the mechanical end on the infinity side. Further, a gap of about 10 ⁇ m is formed between the lens barrel 2 and the sensor cover 8, for example. Thus, in order to position the lens barrel 2 in a state where a gap of about 10 ⁇ m is formed, it is only necessary to bond the lens barrel while holding the position of the lens barrel using a jig.
- the position of the imaging lens 1 is desirably set to a distance from the upper surface (the surface on the Z-axis positive direction side) of the imaging element 6 so that the in-focus mechanical end position is in focus.
- the mechanical contact physical contact
- the position is slightly closer to the image sensor 6 side than the design center value of the in-focus position. It is preferable to attach the imaging lens 1.
- This shift amount is called overinf.
- the overinf is set to be large, the stroke of the lens driving device 5 is increased by that amount, so the overinf needs to be kept to the minimum necessary.
- an overinf amount of about 25 ⁇ m is appropriate. However, since this value is affected by the manufacturing tolerance and assembly tolerance of the part, it is set to a minimum value that matches the actual situation. It is desirable.
- the lower reference surface of the sensor cover 8 is directly abutted against the image sensor 6 and the sensor cover 8 with increased thickness accuracy is used, and the upper surface (Z The lens barrel 2 is positioned with high accuracy with respect to the surface in the positive axial direction (in other words, with respect to the lower surface of the lens driving device 5 (the surface in the negative Z-axis direction)). Therefore, in this embodiment, it can be said that an overinf amount of about 25 ⁇ m is sufficient.
- the lens barrel 2 is attached to a position that is closer to the image sensor 6 by 25 ⁇ m than the in-focus position for a subject at infinity, and there is a gap between the sensor cover 8 and the lens barrel 2 in that state. Exists.
- the characteristic configuration in this embodiment is that a part of the upper AF spring 12a protrudes (extends) from the outer periphery of the intermediate holding member 13, and the arm portion (extension) The protruding portion) 12c is formed, and the upper end of the suspension wire 16 is fixed to a part of the arm portion 12c.
- the relationship between the spring constant of the arm portion 12c and the spring constant of the suspension wire 16 in the longitudinal direction is accurately defined so that the suspension wire 16 does not undergo permanent deformation in the longitudinal direction and buckling in the compression direction. Is desirable. The relationship between the spring constants of both will be described later. Further, the resonance peak can be suppressed by providing the damper material 11 in a part of the arm portion 12c.
- buckling means that when a compressive stress is applied to a wire-like member (metal), the wire cannot be further contracted, and the radial direction is perpendicular to the longitudinal direction of the wire. It refers to the phenomenon that the wire is bent. Also, the stress that causes buckling is called buckling stress.
- the term “permanent strain” refers to a phenomenon in which when a tensile stress is applied to a wire-like member, the elongated wire does not return to its original state after the stress is removed. Note that the stress and the amount of deformation are not proportional, and the stress that causes permanent strain is referred to as yield stress.
- the detailed structure of the arm part 12c is demonstrated using (b) of FIG.
- the arm portion 12c is a portion in which the AF spring 12a extends outward from the intermediate holding member 13, and includes flexible portions 12da and 12db having flexibility, a joint portion 12e joined to the suspension wire 16, and It has a fixed end portion 12f that is relatively less flexible than the flexible portion 12d.
- the fixed end portion 12f has a larger spring width than the flexible portions 12da and 12db, so that the flexibility is relatively smaller than the flexible portions 12da and 12db.
- the fixed end portion 12f extends from two directions, and is joined and connected by a joint portion 12e via a flexible portion 12da (first flexible portion) and a flexible portion 12db (second flexible portion). Yes.
- flexible part 12d means the flexible part 12da or the flexible part 12db.
- the characteristic structure of the present application is that the shape of the flexible portion 12d is axisymmetric with respect to an axis 22a (second axis) and an axis 22b (first axis) that pass through the center of the suspension wire 16 and are orthogonal to each other. That is.
- the reaction force of the spring acts in a balanced manner on the joint portion 12e, so that the joint portion 12e can be displaced with almost no inclination. .
- the fixed end 12f is extended in an arm shape, and the boundary portion between the fixed end 12f and the flexible portion 12d, particularly the fixed end 12f has a large width.
- the straight line connecting the substantially central positions of the two fixed ends passes through the center of the suspension wire 16. That is, the straight line connecting the center Pa of the connection portion between the flexible portion 12da and the fixed end portion 12f and the center Pb of the connection portion between the flexible portion 12db and the fixed end portion 12f is the shaft 22a. That is, the center of the boundary portion and the center of the suspension wire are arranged in a substantially straight line.
- this straight line is one axis 22b which is a reference for line symmetry
- an axis 22a passing through the junction point P, which is the center of the suspension wire, and perpendicular to this is set, and the lines 22a and 22b are line symmetrical.
- the shape of the flexible portion is determined so as to have By adopting such a structure, symmetry can be easily obtained in a small space.
- axisymmetric means that it is axisymmetric with respect to the axis 22a or the axis 22b when viewed from the positive direction side of the Z-axis as shown in FIG. To do. That is, “line symmetry” may be read as “plane symmetry with respect to a plane including the axis 22b and parallel to the optical axis O and a plane including the axis 22a and parallel to the optical axis O”. The same applies to the following.
- the two flexible portions 12d are connected via the joint portion 12e, and the other end of the flexible portion 12d is connected to the fixed end portion 12f to form a doubly supported beam.
- the center portion is not inclined.
- FIG. 4A shows an initial state in which no force is applied in the longitudinal direction of the suspension wire
- FIG. 4B shows a state when the suspension wire receives a force in a direction in which the suspension wire is pushed upward due to a drop impact or the like.
- the deformation state is shown.
- the damper material 11 is not shown for easy viewing.
- a solder 23 for joining the suspension wire 16 and the joint 12e is shown.
- FIG. 4B even when a force is applied to the suspension wire and the flexible portion 12d is deformed, the joint portion 12e is displaced without tilting due to symmetry, so that the suspension wire 16 is not tilted.
- the suspension wire 16 is only subjected to expansion and contraction stress, and almost no shear stress is applied. For example, the risk of breaking beyond the yield stress and proof stress due to a drop impact or fatigue failure due to repeated stress is reduced. It becomes possible to do.
- the joint portion 12e and the fixed end portion 12f are joined via the flexible portion 12d (that is, the joint portion 12e and the fixed end portion 12f are connected via the flexible portion 12d, and the suspension is connected to the joint portion 12e.
- the flexible portion 12d functions as an elastic body for suppressing buckling, permanent strain, fatigue, and the like of the suspension wire 16.
- the arm portion 12c is not particularly limited, but can be made of, for example, metal or plastic. More preferably, the arm portion 12c is made of a material that can sufficiently reduce the spring constant and that does not undergo plastic deformation even when deformed by about 150 ⁇ m.
- the arm part 12c when soldering the arm part 12c and the suspension wire 16, it is preferable to comprise the arm part 12c with a metal.
- a material having a small electrical resistance such as a copper alloy is desirable.
- the arm portion 12 c be integrally formed by extending the upper AF spring 12 a to the outside of the intermediate holding member 13.
- the upper AF spring 12a and the arm portion 12c are made of the same material, and copper alloys such as beryllium copper, nickel copper, and titanium copper are suitable.
- the optical axis with respect to the OIS movable portion including the intermediate holding member 13 is used. Inertial force in the direction.
- a base 19 exists below the intermediate holding member 13, and the base 19 is a stopper that defines a movement range of the intermediate holding member 13 (OIS movable portion) on the lower side in the optical axis direction (Z-axis negative direction side). Since it functions as a (locking member), the displacement of the intermediate holding member 13 in the optical axis direction can be restricted.
- the OIS movable part in consideration of assembly errors and the like, in order to prevent the OIS movable part from coming into contact with the OIS fixed part, it is essential to provide a gap of about 100 ⁇ m to 150 ⁇ m as a gap between the OIS movable part and the OIS fixed part. . Therefore, the interval between the OIS movable part and the OIS fixed part may change by about 150 ⁇ m. If it is attempted to bear this amount of deformation only by the expansion and contraction of the suspension wire 16, the stress applied to the suspension wire 16 at that time may exceed the buckling stress or the yield stress.
- the cover 17 may act as a stopper for the movement of the intermediate holding member 13 on the upper side in the optical axis direction (Z-axis positive direction side).
- the upper (Z-axis positive direction side) movement range is also the lower (Z-axis negative direction side) movement range.
- the flexible portion 12d bears a part of the deformation amount, the deformation amount in the longitudinal direction of the suspension wire 16 can be suppressed.
- FIG. 5 is a schematic diagram showing the configuration of the camera module 50 shown in FIG.
- FIG. 5 is a simplified diagram showing only the important element parts of the present invention.
- a lens holder 4 that holds the imaging lens 1 and the like is supported by two upper and lower AF springs 12 a and 12 b, and a part of the upper AF spring 12 a protrudes outside the intermediate holding member 13.
- a suspension wire 16 is fixed to a part of the protruding arm portion 12c.
- FIG. 6 shows the relationship between the spring constants of the suspension wire 16 and the flexible portion 12d.
- FIG. 6 is another schematic diagram illustrating the configuration of the camera module illustrated in FIG. 1, and is a diagram simply illustrating the configuration of the flexible portion 12 d and the spring in the longitudinal direction of the suspension wire 16.
- k 1 is the spring constant of the flexible portion 12d of the arm portion 12c extending from the AF spring 12a of the upper (Z-axis positive direction)
- k 2 is a longitudinal spring constant of the suspension wires 16. That is, it has a structure in which two springs k 1 and k 2 are connected in series.
- k 1 is the spring constant of the damper material inclusive of the arm portion 12c.
- only one suspension wire 16 will be described.
- k 1 ⁇ k 2 is set.
- the deformation amount of each spring is It is inversely proportional to the spring constant and is obtained as in the following formulas (1) and (2).
- the force F required to deform the suspension wire 16 by ⁇ 2 is obtained as in the following formula (3).
- the deformation amount ⁇ , the cross-sectional area A, and the spring constants k 1 and k 2 with the moving range as the upper limit may be set so as to satisfy the following formula (5).
- Euler's buckling stress is generally used as a guide.
- Euler's buckling stress is expressed by the following formula (6).
- E represents the Young's modulus of the suspension wire 16
- ⁇ represents the slenderness ratio of the suspension wire 16, respectively.
- Euler's buckling stress was about 1 ⁇ 10 8 N / m 2 .
- Euler's buckling stress is an equation when an ideal vertical load is applied. In reality, the load may be applied obliquely, and the buckling stress should be set by looking at a certain margin. desirable.
- a manufacturing method including the above design / calculation steps is also included in the present invention.
- the base 19 functions as a stopper (locking member), and the movement range of the intermediate holding member 13 (OIS movable portion) in the optical axis direction is defined.
- This moving range is distributed to the deformation amount in the longitudinal direction of the suspension wire 16 and the deformation amount of the flexible portion 12d at a ratio corresponding to each spring constant. Since the stress generated by the amount of deformation the longitudinal direction of the suspension wire 16 does not exceed the buckling stress and the yield stress of the suspension wire 16, buckling and permanent distortion can be prevented, and drop resistance can be reduced.
- the module 50 can be provided.
- FIG. 7A is a view corresponding to FIG. 3B, showing a configuration for preventing breakage of the suspension wire 16 in the camera module 50 of the present embodiment, and the suspension wire 16 in the camera module 50. It is an enlarged view of a connection part vicinity with the arm part 12c which exists on the outer side of AF spring.
- the same member number is attached
- the shape of the flexible portion 12d has a folded portion 12D.
- the first embodiment is a ring-shaped flexible portion
- the folded length as in the second embodiment makes it possible to increase the effective length of the flexible portion 12d. It becomes easy to optimize the spring constant of 12d.
- the basic effect is the same as in the first embodiment. That is, the fixed end portion 12f and the joint portion 12e are connected via the flexible portion 12d, and the suspension wire 16 is joined to the joint portion 12e.
- the shape of the flexible portion 12 d is axisymmetric with respect to each of the two shafts 22 a and 22 b passing through the center of the suspension wire 16. Further, the four flexible portions 12d form a doubly supported beam structure via the joint portion 12e.
- FIGS. 7B and 7C are diagrams showing modifications of the configuration for preventing breakage of the suspension wire 16 shown in FIG.
- FIG. 7C shows the shape of the folded portion 12D of the flexible portion 12d shown in FIG. 7B with respect to the direction in which the folded portion 12D extends (the direction in which the Zx plane expands) (the y axis). It is a side view with respect to (b) of Drawing 7 when it sees from the direction side.
- the folded portion 12D is not limited to a shape spreading on the XY plane as shown in FIG.
- it may have a shape extending in the Zx plane.
- the xyZ coordinate axis is a coordinate axis obtained by rotating the XYZ axis around the Z axis
- the x axis is parallel to the axis 22b
- the y axis is parallel to the axis 22a.
- the folded portions 12D shown in FIGS. 7B and 7C correspond to the four folded portions 12D shown in FIG. 7A, and are folded back on a plane different from the folded portions 12D. It is.
- the folded portion 12D shown in FIG. 7A is more than the folded portion 12D shown in FIGS. 7B and 7C. Excellent workability. Note that, as shown in FIGS. 7B and 7C, the folded portion 12D when the entire flexible portion 12d is not included in one plane is three-dimensionally shaped by a 3D printer (three dimensional printer) or the like. You can do it.
- the flexible portion 12d may expand spatially.
- the effective length of the flexible portion 12d can be further increased, and the spring constant of the flexible portion 12d can be further optimized.
- FIG. 8 is a view corresponding to FIG. 3B, showing a configuration for preventing breakage of the suspension wire 16 in the camera module 50 of the present embodiment, and is outside the suspension wire 16 and the AF spring in the camera module 50. It is an enlarged view of the connection part vicinity with the arm part 12c in a.
- the same member number is attached
- the movable part 30 may include the boundary edge part 13b that suppresses the translational movement in the direction in which the optical axis O of the connecting part of the flexible part 12d and the movable part 30 extends.
- the fixed end 12 f is fixed to the intermediate holding member 13.
- the fixed end portion 12f does not need to bend, but, as in the first embodiment, if the width of the spring is widened, the flexibility is relatively small compared to the flexible portion 12d, but some bending occurs. .
- the fixed end portion 12f hardly deforms.
- the fixed end 12f is deformed in the shape as in the first embodiment, asymmetry is generated with respect to the lines 22a and 22b. Therefore, it is preferable that the fixed end 12f is not deformed.
- the basic effect is the same as that of the first embodiment.
- the fixed end portion 12f and the joint portion 12e are connected via the flexible portion 12d, and the suspension wire 16 is joined to the joint portion 12e.
- the shape of the flexible portion 12 d is axisymmetric with respect to each of the two shafts 22 a and 22 b passing through the center of the suspension wire 16. Further, the two ring-shaped flexible portions 12d form a doubly supported beam structure via the joint portion 12e.
- the other end of the suspension wire 16 is joined to the joint portion 12e, and the joint portion 12e is connected to the fixed end portion 12f via the flexible portion 12d. And even if an impact is applied to the base 19, the fixed end portion 12 f does not move in response to the impact. Therefore, the other end of the suspension wire 16 can be moved to some extent by deformation of the flexible portion 12d and the joining portion 12e, but is difficult to move in response to an impact.
- one end of the suspension wire 16 is easy to move relative to the other end of the suspension wire 16, so when an impact is applied to the base 19, the suspension wire 16 may bend and the joint 12 e may be inclined. In other words, a force that tilts (rotates) the joint 12e acts on the joint point P between the suspension wire 16 and the joint 12e.
- FIG. 9 is a diagram corresponding to FIG. 3B, showing a configuration for preventing breakage of the suspension wire 16 in the camera module 50 of the present embodiment
- FIG. 9A is a schematic diagram showing the configuration.
- (B) is a figure which shows this structure implement
- the structure for preventing breakage of the suspension wire 16 in the camera module 50 is basically that the flexible portion 12d rotates the rotational motion 22B of the joint portion 12e around the shaft 22b. Further, the rotational movement 22A of the joint portion 12e around the shaft 22a is suppressed, and the joint portion 12e and the fixed end portion 12f are connected.
- the joint portion 12e since the flexible portion 12d suppresses the rotational movement of the joint portion 12e about the two axes orthogonal to each other of the shafts 22a and 22b, the joint portion 12e does not tilt. No longer works.
- the suspension wire 16 is less likely to be broken by an impact (for example, a rapid movement due to a drop of the camera module). That is, the risk of breakage of the suspension wire 16 can be reduced.
- the flexible part 12d can be realized as described in the above embodiment, but may be realized as follows.
- the flexible portion 12d includes an elastic body (such as rubber) and a reinforcing wire D having a higher elastic modulus than the elastic body and arranged in parallel with the shaft 22b. May be included.
- an elastic body such as rubber
- a reinforcing wire D having a higher elastic modulus than the elastic body and arranged in parallel with the shaft 22b. May be included.
- shaft 22b also in the direction rotated centering on the axis
- the shape of the flexible portion 12d is a ring shape shown in FIGS. 3A to 3B, FIG. It is preferable that the shape be easily bent in the direction of the shaft 22a, such as the shape having the folded portion shown in (a) to (c) of FIG. Thereby, the spring constant (elastic modulus) of the flexible part 12d becomes low, and the flexible part 12d can extend in the direction of the shaft 22a. In other words, the joint 12e can be displaced according to the translational motion of the suspension wire 16.
- the camera module according to aspect 1 of the present invention is a camera module having a camera shake correction function, and includes a movable unit 30 including the imaging lens 1, a fixed unit 40 surrounding the movable unit, and an optical axis O of the imaging lens.
- a suspension wire 16 that extends parallel or oblique to the movable portion, supports the movable portion so that the movable portion moves in a direction perpendicular to the optical axis, and has one end fixed to the fixed portion, and the suspension wire Rotating motion 22B of the joint centered on the first axis (axis 22b) orthogonal to the optical axis through the joint 12e joined to the other end of the wire and the suspension wire and the joint P of the joint.
- the other end of the suspension wire is joined to the joint, and the joint is connected to the movable part via the flexible part. And even if an impact is applied to the fixed part, the movable part does not move in response to the impact. Therefore, although the other end of the suspension wire can move to some extent due to deformation of the flexible portion and the joint portion, it does not easily move in response to an impact.
- the suspension wire since one end of the suspension wire is easy to move relative to the other end of the suspension wire, when an impact is applied to the fixed portion, the suspension wire may bend and the joint portion may be inclined. In other words, a force for rotating the joint acts on the joint point between the suspension wire and the joint.
- the joint portion since the flexible portion suppresses the rotational movement of the joint portion around the two axes orthogonal to each other of the first axis and the second axis, the joint portion does not tilt, for example, shear force is applied to the suspension wire. No longer works.
- the suspension wire is less likely to be broken by an impact (for example, a rapid movement due to a drop of the camera module). That is, the risk of breakage of the suspension wire can be reduced.
- the shape of the flexible portion is a plane including the first axis and parallel to the optical axis, and includes the second axis and the optical axis. It may be plane symmetric with respect to a parallel plane.
- the shape of the flexible portion is plane-symmetric with respect to a plane including two axes that are orthogonal to each other and that passes through the junction. For this reason, since the flexible portion deforms symmetrically with respect to the joining point, the joining portion hardly tilts (tilts). Therefore, since only the force in the expansion / contraction direction acts on the suspension wire, the shearing force (shear stress) hardly acts. Therefore, the suspension wire is less likely to be broken.
- a camera module includes at least one pair of the flexible portions according to the aspect 1 or 2 described above, and one end of the joint portion is connected to the movable portion by the first flexible portion 12da.
- the other end of the joint portion is connected to the movable portion by the second flexible portion 12db, the center Pa of the connecting portion of the first flexible portion and the movable portion, and the second flexible portion.
- a straight line connecting the flexible part and the center Pb of the connecting part of the movable part may be the second axis.
- the center of each boundary portion and the center (joining point) of the suspension wire are arranged substantially in a straight line. And since a flexible part is also symmetrically arranged with respect to this straight line, the tilt (inclination) of the junction part at the time of a deformation
- the elastic modulus of the connecting portion of the flexible part and the movable part is different from the elastic modulus of the flexible part.
- the flexible part may be a ring extending between the joint part and the movable part.
- the flexible portion can be realized by a simple ring shape.
- the flexible part may be folded between the joint part and the movable part.
- the spring constant is inversely proportional to the cube of the effective length of the spring.
- the effective length of the flexible portion can be increased, and the spring constant of the flexible portion can be easily optimized.
- the spring constant of the flexible portion can be made smaller while maintaining the overall dimensions of the flexible portion below a certain level.
- the movable part is a translational motion in a direction in which the optical axis of the flexible part and a connecting portion of the movable part extends.
- the translation suppression part (boundary edge part 13b) which suppresses may be included.
- the structure composed of the joint portion and the flexible portion is generally a doubly supported beam structure in which both ends of the portion are fixed by the translation suppressing portion. Thereby, a junction part becomes further difficult to incline.
- the flexible part in any one of Aspects 1 to 7, has an elastic body, an elastic modulus higher than that of the elastic body, and the first axis.
- the reinforcing wire D arranged in parallel may be included.
- shaft is also the direction rotating centering on a 1st axis
- a method for manufacturing a camera module according to aspect 9 of the present invention includes a movable unit 30 including an imaging lens, a fixed unit surrounding the movable unit, and extending parallel or oblique to the optical axis of the imaging lens.
- a suspension wire that supports the movable portion so that the movable portion moves in a direction perpendicular to the optical axis, has one end fixed to the fixed portion, and a joint portion to which the other end of the suspension wire is fixed.
- a method of manufacturing a camera module having a camera shake correction function the step of designing a flexible portion, the movable distance of the movable portion, the cross-sectional area and spring constant of the suspension wire, and the allowable Calculating the elastic modulus of the flexible part so that the stress obtained from the spring constant of the flexible part is smaller than the buckling stress of the suspension wire; Rotation of the joint around the first axis perpendicular to the optical axis through the junction of the wire and the joint and the second axis perpendicular to the first axis through the junction Connecting the joint and the movable part so as to suppress the rotational movement of the joint.
- the present invention can be used in the field of manufacturing camera modules, and in particular, can be preferably used in the field of manufacturing camera modules mounted on various electric devices including communication devices such as portable terminals.
- Imaging lens Lens barrel (movable part) 3 Adhesive (moving part) 4 Lens holder (movable part) 5 Lens drive device (movable part) 12a AF spring (movable part) 12b AF spring (movable part) 12c Arm part (movable part) 12d Flexible part (rotation suppression part) 12da flexible part (rotation suppression part) 12db flexible part (rotation suppression part) 12e Joining part 12f Fixed end (movable part) 13 Intermediate holding member (movable part) 13a Protruding part (movable part) 13b Boundary edge part (translation suppression part) 14 AF coil (movable part) 15 Permanent magnet (movable part) 16 Suspension wire 17 Cover (fixed part) 18 OIS coil (fixed part) 19 Base (fixed part) 21 Hall element (fixed part) 22A Rotation (tilt) 22B Rotation (tilt) 22a axis (second axis) 22b axis (first axis) 30 OIS movable part (movable part) 40 OIS fixed part
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Abstract
Description
図1は、本実施形態のカメラモジュール50における概略構成を模式的に示す斜視図である。なお、図1に示されるXYZ軸は、図2~図10の座標軸とも対応する。
図1~図3に示すように、カメラモジュール50は、撮像レンズ1、撮像レンズ1を収納するレンズバレル2、および、接着剤3を用いてレンズバレル2を内部に固定しているレンズホルダー4を有する。
レンズ駆動装置5は、AFバネ12aおよび12b、中間保持部材13、AFコイル14、永久磁石15、サスペンションワイヤー16、OIS(Optical Image Stabilizer)コイル18、ならびに、ベース19を備えている。
本実施形態では、レンズバレル2が組み込まれた状態で、レンズバレル2の一部が、ベース19の開口19a内にまで入り込んでいる。一般に、撮像レンズ1のフランジバック(レンズバレル2の下端面から撮像素子6面までの距離)を十分に大きく取ることが困難なため、このような構成になる場合が多い。レンズ駆動装置5は、センサカバー8上に搭載される。
本実施形態における特徴的な構成は、図3の(a)に示すように、上側のAFバネ12aの一部が中間保持部材13の外周よりも突出(延出)して、アーム部(延出部分)12cを形成し、アーム部12cの一部にサスペンションワイヤー16の上端を固定した構造であって、かつ、アーム部12cが変形した際に、サスペンションワイヤー16が傾くことを極力防止するようになっている。また、サスペンションワイヤー16の長手方向の永久ひずみおよび圧縮方向の座屈が生じないように、アーム部12cのバネ定数とサスペンションワイヤー16の長手方向のバネ定数との関係を的確に規定してあることが望ましい。なお、両者のバネ定数の関係は後述する。また、アーム部12cの一部に、ダンパー材11を設けることによって、共振ピークを抑制することができる。
次に、本発明の実施形態に係るカメラモジュール50における落下耐性について、より詳細に説明する。サスペンションワイヤー16および可撓部12dのバネ定数の関係を図6に示す。図6は、図1に示されるカメラモジュールの構成を示す他の模式図であって、可撓部12dとサスペンションワイヤー16の長手方向のバネの構成を簡略的に示す図である。k1が上側(Z軸正方向側)のAFバネ12aから延出したアーム部12cにおける可撓部12dのバネ定数、k2がサスペンションワイヤー16の長手方向のバネ定数である。すなわち、k1とk2という2つのバネが直列に接続された構造となっている。なお、アーム部12cの一部にダンパー材11が塗布されている場合には、k1はダンパー材込みのアーム部12cのバネ定数となる。簡単のため、1箇所のみのサスペンションワイヤー16に関して説明を行う。
サスペンションワイヤー16の変形量δ2=δk1/(k1+k2)=1.5μm・・・(2)
また、サスペンションワイヤー16をδ2だけ変形させるのに必要な力Fは、下記式(3)のように求められる。
ここで、サスペンションワイヤー16の断面積は、5×10-9m2であるとする。このとき、サスペンションワイヤー16の長手方向の変形量によって規定される応力は、サスペンションワイヤー16の断面積をAとすると、下記式(4)のように求められる。
このσがサスペンションワイヤー16の座屈応力σeを超えないことが必須となる。すなわち、座屈応力を問題にしているのは、通常の場合、降伏応力よりも座屈応力の方が小さくなるためである。
なお、座屈応力としては、通常Eulerの座屈応力が目安とされる。Eulerの座屈応力は、下記式(6)で表される。Cは定数であり、両端固定梁の場合にはC=4となる。Eはサスペンションワイヤー16のヤング率、λはサスペンションワイヤー16の細長比をそれぞれ示す。
一つの設計例に基づいて、Eulerの座屈応力を計算すると、1×108N/m2程度の値となった。しかしながら、Eulerの座屈応力は理想的な垂直荷重が加えられた場合の式であり、現実には斜めに荷重がかかる場合もあり、ある程度のマージンを見て、座屈応力を設定するのが望ましい。なお、以上の設計・計算工程を含む製造方法も、本発明に含まれる。
第2実施形態が第1実施形態と異なるのはアーム部12c、特に可撓部12dの形状である。図7の(a)は、本実施形態のカメラモジュール50におけるサスペンションワイヤー16の破断を防止する構成を示す、図3の(b)に対応する図であって、カメラモジュール50におけるサスペンションワイヤー16とAFバネの外側にあるアーム部12cとの連結部近傍の拡大図である。なお、第1実施形態と同様の部材には同じ部材番号を付し、説明を省略する。
図7の(b)・(c)は、図7の(a)に示されるサスペンションワイヤー16の破断を防止する構成の変形例を示す図である。図7の(c)は、図7の(b)に示される可撓部12dの折り返し部12Dの形状を、折り返し部12Dが延びる方向(Zx平面が広がる方向)に対して側面側(y軸方向側)から見たときの、図7の(b)に対する側面図である。
第3実施形態が第1実施形態と異なるのは固定端部12fと可撓部12dの境界部分が中間保持部材13の境界エッジにより形成されている点である。図8は、本実施形態のカメラモジュール50におけるサスペンションワイヤー16の破断を防止する構成を示す、図3の(b)に対応する図であって、カメラモジュール50におけるサスペンションワイヤー16とAFバネの外側にあるアーム部12cとの連結部近傍の拡大図である。なお、第1実施形態と同様の部材には同じ部材番号を付し、説明を省略する。
本発明の第4実施形態について、図9に基づいて説明すれば、以下のとおりである。なお、説明の便宜上、上述の実施形態にて説明した部材と同じ機能を有する部材については、同じ符号を付記し、その説明を省略する。
ここで、上述のように、サスペンションワイヤー16の一端は、ベース19(固定部)に固定されているので、ベース19に衝撃が加わると、該衝撃に応じて移動する。
図9は、本実施形態のカメラモジュール50におけるサスペンションワイヤー16の破断を防止する構成を示す、図3の(b)に対応する図であって、(a)は該構成を示す模式図であり、(b)は強化線材によって実現した該構成を示す図である。
可撓部12dは、上述の実施形態に記載されているように実現できるが、以下のように実現してもよい。
本発明の態様1に係るカメラモジュールは、手ぶれ補正機能を有するカメラモジュールであって、撮像レンズ1を備える可動部30と、上記可動部を囲う固定部40と、上記撮像レンズの光軸Oに対して平行または斜めに延在し、上記可動部が上記光軸に垂直な方向に移動するように上記可動部を支持し、一端が上記固定部に固定されたサスペンションワイヤー16と、上記サスペンションワイヤーの他端に接合された接合部12eと、上記サスペンションワイヤーおよび上記接合部の接合点Pを通って上記光軸と直交する第1軸(軸22b)を中心とする上記接合部の回転運動22Bならびに上記接合点を通って上記第1軸と直交する第2軸(軸22a)を中心とする上記接合部の回転運動22Aを抑制し、かつ、上記接合部および上記可動部を連結する可撓部12d・12da・12dbとを備える。
本発明は、上述した各実施形態に限定されるものではなく、請求項に示した範囲で種々の変更が可能であり、異なる実施形態にそれぞれ開示された技術的手段を適宜組み合わせて得られる実施形態についても本発明の技術的範囲に含まれる。さらに、各実施形態にそれぞれ開示された技術的手段を組み合わせることにより、新しい技術的特徴を形成することができる。
2 レンズバレル(可動部)
3 接着剤(可動部)
4 レンズホルダー(可動部)
5 レンズ駆動装置(可動部)
12a AFバネ(可動部)
12b AFバネ(可動部)
12c アーム部(可動部)
12d 可撓部(回転抑制部)
12da 可撓部(回転抑制部)
12db 可撓部(回転抑制部)
12e 接合部
12f 固定端部(可動部)
13 中間保持部材(可動部)
13a 突出部(可動部)
13b 境界エッジ部(並進抑制部)
14 AFコイル(可動部)
15 永久磁石(可動部)
16 サスペンションワイヤー
17 カバー(固定部)
18 OISコイル(固定部)
19 ベース(固定部)
21 ホール素子(固定部)
22A 回転運動(傾き)
22B 回転運動(傾き)
22a 軸(第2軸)
22b 軸(第1軸)
30 OIS可動部(可動部)
40 OIS固定部(固定部)
50 カメラモジュール
D 強化線材
P 接合点
Pa 中心
Pb 中心
k1 バネ定数
k2 バネ定数
σ 応力
σe 座屈応力
Claims (5)
- 手ぶれ補正機能を有するカメラモジュールであって、
撮像レンズを備える可動部と、
上記可動部を囲う固定部と、
上記撮像レンズの光軸に対して平行または斜めに延在し、上記可動部が上記光軸に垂直な方向に移動するように上記可動部を支持し、一端が上記固定部に固定されたサスペンションワイヤーと、
上記サスペンションワイヤーの他端に接合された接合部と、
上記サスペンションワイヤーおよび上記接合部の接合点を通って上記光軸と直交する第1軸を中心とする上記接合部の傾きならびに上記接合点を通って上記第1軸と直交する第2軸を中心とする上記接合部の傾きを抑制し、かつ、上記接合部および上記可動部を連結する可撓部と、
を備えることを特徴とするカメラモジュール。 - 上記可撓部の形状は、上記第1軸を含み上記光軸に平行な平面、および、上記第2軸を含み上記光軸に平行な平面、に対して面対称であることを特徴とする請求項1に記載のカメラモジュール。
- 上記可撓部および上記可動部の連結部位の弾性率と、上記可撓部の弾性率とは、異なることを特徴とする請求項1または2に記載のカメラモジュール。
- 上記可撓部は、上記接合部と上記可動部との間で折り返されていることを特徴とする請求項3に記載のカメラモジュール。
- 撮像レンズを備える可動部と、上記可動部を囲う固定部と、上記撮像レンズの光軸に対して平行または斜めに延在し、上記可動部が上記光軸に垂直な方向に移動するように上記可動部を支持し、一端が上記固定部に固定されたサスペンションワイヤーと、上記サスペンションワイヤーの他端が固定された接合部とを備えている、手ぶれ補正機能を有するカメラモジュールの製造方法であって、
可撓部を設計する工程であって、上記可動部の移動可能距離と、上記サスペンションワイヤーの断面積およびバネ定数と、上記可撓部のバネ定数とから求められる応力が、上記サスペンションワイヤーの座屈応力より小さくなるように、上記可撓部の弾性率を計算する工程と、
上記サスペンションワイヤーおよび上記接合部の接合点を通って上記光軸と直交する第1軸を中心とする上記接合部の傾きならびに上記接合点を通って上記第1軸と直交する第2軸を中心とする上記接合部の傾きを抑制するように、上記接合部および上記可動部を連結する工程と、
を含むことを特徴とするカメラモジュールの製造方法。
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JP2016520972A JP6271720B2 (ja) | 2014-05-23 | 2015-03-17 | カメラモジュールおよびカメラモジュールの製造方法 |
CN201580025163.8A CN106462028B (zh) | 2014-05-23 | 2015-03-17 | 相机模块以及相机模块的制造方法 |
US15/310,221 US10104293B2 (en) | 2014-05-23 | 2015-03-17 | Camera module including suspension wire that supports moving portion with image capturing lens and method for manufacturing camera module |
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JP2014107452 | 2014-05-23 | ||
JP2014-107452 | 2014-05-23 |
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Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2018147100A1 (ja) * | 2017-02-08 | 2018-08-16 | アルプス電気株式会社 | レンズ駆動装置 |
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CN106462028A (zh) | 2017-02-22 |
US20170171469A1 (en) | 2017-06-15 |
CN106462028B (zh) | 2019-12-24 |
US10104293B2 (en) | 2018-10-16 |
JPWO2015178081A1 (ja) | 2017-04-20 |
JP6271720B2 (ja) | 2018-01-31 |
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