JP2012141640A - Image stabilizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact image stabilizing device eliminating optical deterioration and a harmful effect on machine precision when stabilizing a camera shake and facilitating control of the stabilization.SOLUTION: The image stabilizing device includes: a movable-side unit that is provided, in a movable-side frame, with a camera unit having a lens and an image sensor, and a movable-side rotating shaft having a spherical tip end face; a fixed-side unit which includes a fixed-side rotating shaft that is formed, at the tip end thereof, with a spherical face coming into contact with the tip end of the movable-side rotating shaft and to which the movable-side unit is rotatably attached; linear actuators disposed between the movable-side frame and the fixed-side frame and driving the movable-side unit to rotate around two orthogonal axes; camera shake detecting means for detecting an amount of came shakes around the two orthogonal axes; and control means, when the camera shake detecting means detects the amount of the camera shakes, controlling the linear actuator to rotate the movable-side unit, thereby offsetting the amount of camera shake.

Description

  The present invention relates to a camera shake correction apparatus in a digital camera or the like and a linear actuator used in the camera shake correction apparatus.

  In general, camera shake that occurs when taking a picture is a phenomenon in which an image is blurred as a result of the camera moving between the time the shutter release button is pressed and the aperture is opened. Therefore, as means for reducing such a camera shake phenomenon in still image shooting, optical camera shake correction as described in Patent Documents 1 and 2 and sensor shift camera shake correction as described in Patent Document 3 are used. Has traditionally been done.

  FIG. 17 shows an optical camera shake correction mechanism. Here, the camera case 100 has a lens barrel 110, a plurality of lenses 120 are arranged in the lens barrel 110, and an image sensor 130 is provided at the imaging position at the rear end of the lens barrel 110. ing. The image sensor 130 is an element such as a CCD (Charge Coupled Devices) or a CMOS that converts an optical image into an image signal. In the camera case 100, a gyro sensor 140 is attached as a shake detection means for detecting the shake amount of the camera due to camera shake.

  FIG. 17A shows a state immediately after the aperture is opened by pressing the release button 150. At this time, the subject image is at the imaging position L on the optical axis K in the image sensor 130, but when the camera is tilted, the imaging position L is shifted from the optical axis K as shown in FIG. It becomes. At this time, the gyro sensor 140 detects that the camera has moved, and as shown by an arrow M1 in FIG. 5C, the lens 120 is moved to bend the optical axis K to move the camera. The influence of the tilt is cancelled, and the shift of the imaging position L is corrected.

  FIG. 18 shows a sensor shift type image stabilization mechanism. FIG. 6A shows the state immediately after the aperture is opened by pressing the release button 150, and the subject image is at the imaging position L on the optical axis K in the image sensor 130. When the camera is tilted, the imaging position L is shifted from the optical axis K as shown in FIG. At this time, the gyro sensor 140 detects that the camera has moved. By moving the image sensor 130 as indicated by an arrow M2 in FIG. 5C, the influence of the camera tilt is canceled and the imaging position is reached. The L shift is corrected.

JP 2003-57706 A JP-A-6-67255 JP 2005-316400 A

  However, the above-described optical camera shake correction has a problem that it is difficult to design for optical axis correction because the optical axis is changed by moving the lens. Further, since the lens is moved, a problem such as aberration occurs and causes optical deterioration. On the other hand, in the sensor shift type image stabilization described above, the position of the image sensor is moved to change the position with respect to the optical system, so that there is an adverse effect on mechanical accuracy such as play.

  Furthermore, in any of the correction methods, a sensor for detecting the movement of the camera body and a sensor for controlling the movement of the lens and the image sensor are required. Therefore, not only the control is complicated, but the number of sensors is not limited. Many of them are difficult to downsize. In addition, when the specifications of the lens and the image sensor change, it is also necessary to change the movement amount thereof, and it is necessary to customize each time the specification changes, resulting in a problem of poor mass production efficiency.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a camera shake correction device that does not have an adverse effect on optical deterioration or machine accuracy when correcting camera shake, is easy to control correction, and can be downsized. Another object of the present invention is to provide a linear actuator that can be suitably used in a camera shake correction apparatus.

The present invention proposes the following matters in order to solve the above problems.
(1) The present invention provides a camera unit including a lens and an image sensor, a movable side rotation shaft having a spherical end surface, and a movable side unit provided on the movable side frame. A fixed-side rotation shaft having a spherical surface in contact with the distal end portion formed on the distal end portion is provided on the fixed-side frame, and the movable-side unit is rotatably mounted between the movable-side frame and the fixed-side frame. A linear actuator that drives the movable side unit to rotate about two orthogonal axes, a camera shake detection unit that detects a camera shake amount about the two orthogonal axes, and the camera shake detection unit includes a camera Control means for controlling the linear actuator to rotate the movable unit so as to cancel the shake amount when the shake amount is detected. It proposes a camera-shake correction apparatus characterized by.

(2) In the camera shake correction device according to (1), the present invention is characterized in that a biasing member that biases the movable side frame in the direction of the fixed side frame is stretched between the movable side frame and the fixed side frame. The camera shake correction device according to claim 1 is proposed.

(3) The present invention is the camera shake correction device according to (1) or (2), which includes a pin portion and a groove portion, and restricts rotation of the movable side frame only around the two orthogonal axes by engaging with each other. A camera shake correction device characterized in that a rotation restricting means is provided is proposed.

(4) In the camera shake correction device according to (3), the rotation restricting unit is configured such that the pin portion extends in one axial direction of the two orthogonal axes, and the groove portion extends in the other axial direction. A camera shake correction device characterized by the above is proposed.

(5) The present invention has two convex pieces, a side yoke having a magnet attached to the opposing surface of the convex piece, and a center yoke provided on the side yoke so as to be positioned between the two convex pieces. The camera shake correction apparatus is characterized in that a fixed part is formed by a coil formed in a cylindrical shape, and a movable part is formed by a coil through which the center yoke passes and a cap attached to the tip of the coil. A linear actuator to be used is proposed.

(6) The present invention has two convex pieces, a side yoke having a magnet attached to the opposing surface of the convex piece, and a center yoke provided on the side yoke so as to be positioned between the two convex pieces. And a cap attached to the outer surface of the side yoke to form a movable part, which is formed in a cylindrical shape, and a fixed part is formed by a coil through which the center yoke passes and a base that supports the coil. We have proposed a linear actuator for use in the characteristic image stabilization device.

(7) According to the present invention, in the linear actuator used in the camera shake correction device according to (5) or (6), the cap has a protrusion protruding in a spherical shape. 6 proposes a linear actuator used in the camera shake correction apparatus described in item 6.

  According to the camera shake correction apparatus of the present invention, there is no adverse effect on optical deterioration and machine accuracy, and there is an effect that camera shake correction can be easily controlled and downsized and there is no adverse effect on mass production efficiency.

  In addition, the linear actuator used in the camera shake correction apparatus of the present invention can be downsized, can be easily controlled, has versatility, and is excellent in mass productivity.

It is a disassembled perspective view which shows the camera-shake correction apparatus in the 1st Embodiment of this invention. It is a perspective view in the middle of the assembly | attachment of the 1st Embodiment of this invention. It is a perspective view which shows the action | operation of the 1st Embodiment of this invention. It is a front view of the 1st Embodiment of this invention. (A), (b), (c) is a side view explaining the action | operation of the 1st Embodiment of this invention. It is a perspective view which shows the camera-shake correction apparatus in the 2nd Embodiment of this invention. It is a perspective view which shows the action | operation of the 2nd Embodiment of this invention. It is a perspective view explaining the 2nd Embodiment of this invention. It is a disassembled perspective view which shows the linear actuator in the 3rd Embodiment of this invention. (A), (b), (c) is the front view of the 3rd Embodiment of this invention, a bottom view, and a right view. It is sectional drawing which shows the relationship between the magnetic field and electric current in the 3rd Embodiment of this invention. (A), (b), (c) is the BB sectional drawing in FIG.10 (b) which shows the action | operation of the 3rd Embodiment of this invention. It is a disassembled perspective view which shows the linear actuator in the 4th Embodiment of this invention. (A), (b), (c) is the front view of the 4th Embodiment of this invention, a bottom view, and a right view. It is sectional drawing which shows the relationship between the magnetic field and electric current in the 4th Embodiment of this invention. (A), (b), (c) is CC sectional view taken on the line in FIG.14 (b) which shows the action | operation of the 4th Embodiment of this invention. (A), (b), (c) is sectional drawing which shows the action | operation of an optical camera-shake correction mechanism. (A), (b), (c) is sectional drawing which shows the action | operation of a sensor shift type camera-shake correction mechanism.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Note that the constituent elements in the present embodiment can be appropriately replaced with existing constituent elements and the like, and various variations including combinations with other existing constituent elements are possible. Therefore, the description of the present embodiment does not limit the contents of the invention described in the claims.

<First Embodiment>
1 to 5 show a camera shake correction apparatus according to a first embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a perspective view during assembly, FIG. 3 is a perspective view, and FIG. FIG. 5 is a cross-sectional view showing the operation of camera shake correction.

  The camera to which the first embodiment is applied is a digital camera, and includes a movable side unit 1, a fixed side uni and 2, linear actuators 4 and 5, camera shake detection means 6 and 7, and control means.

  The movable side unit 1 includes a camera unit 10, a movable side rotating shaft 11, and a movable side frame 12 on which these are provided. The movable side frame 12 is formed so as to be substantially rectangular when viewed from the plane.

  The camera unit 10 is integrally provided with a lens for forming an image and an image sensor (both not shown). The image sensor is disposed at an imaging position on the optical axis of the lens. The image sensor is an element that converts an optical image from a lens into an image signal, and a CCD, a CMOS, or the like is used. As described above, in the structure in which the camera unit 10 integrally includes the lens and the image sensor, when the camera unit 10 moves, the lens and the image sensor move together with the camera unit 10. The position of the image sensor and the relative position between the lens and the image sensor do not change.

  As shown in FIG. 1, the camera unit 10 is fixed by being sandwiched between a lower frame 13 and an upper frame 14. Then, the camera unit 10 is attached to the movable frame 12 by fixing the lower frame 13 to the movable frame 12 by screwing, welding or the like. An FPC (Flexible Printed Circuit) 115 for electrical connection is drawn out from the camera unit 10.

  The movable rotating shaft 11 is provided at one corner of the four corners of the movable frame 12. The movable side rotating shaft 11 is provided so as to stand up from the movable side frame 12, and the tip end portion (the end portion on the standing side) is a concave spherical surface 11a. The movable side rotating shaft 11 corresponds to a fixed side rotating shaft 21 in the fixed side unit 2 described later.

  The fixed side unit 2 has a fixed side frame 22 having substantially the same shape as the movable side frame 12, and a fixed side rotating shaft 21 is provided on the fixed side frame 22. The fixed-side rotating shaft 21 is provided upright at one corner corresponding to the movable-side rotating shaft 11, and the tip portion (the standing-side end portion) is a spherical protrusion 21 a. In the fixed-side rotating shaft 21 and the movable-side rotating shaft 11 whose tip portions are both spherical, the spherical surfaces come into contact with each other when the movable-side frame 12 is assembled to the fixed-side frame 22. Thereby, as shown in FIG. 5, the movable side frame 12 (movable side unit 1) can rotate with respect to the fixed side frame 22. A control board 23 is disposed on the surface of the fixed side frame 22 on the movable side frame 12 side.

  The camera shake detection means 6 and 7 are means for detecting the shake amount of the camera in the two axis directions orthogonal to the X axis and the Y axis (see FIG. 3), and the X axis gyro sensor 6 and the Y axis gyro sensor 7. Consists of. These gyro sensors 6 and 7 are mounted on the FPC 24 for gyro sensor. The gyro sensor FPC 24 is attached to the side surface of the upper frame 14 in a state of being bent at a substantially right angle so that the gyro sensors 6 and 7 are positioned at right angles. In other words, the gyro sensors 6 and 7 are arranged in parallel with the X axis and the Y axis, respectively, around the rotation axis constituted by the movable side rotation shaft 11 and the fixed side rotation shaft 21, and thereby the gyro sensor 6. , 7 are located on the orthogonal side surfaces of the camera unit 10 and detect the camera shake amount of the camera unit 10 (that is, the camera) around two orthogonal axes.

  The linear actuators 4 and 5 are formed by an X-axis rotating linear actuator 4 and a Y-axis rotating linear actuator 5. These linear actuators 4 and 5 are arranged on the X axis and the Y axis, respectively, around the rotation axis constituted by the movable side rotation shaft 11 and the fixed side rotation shaft 21, thereby the linear actuator. 4 and 5 are located on two orthogonal axes. The linear actuators 4 and 5 are fixed to a surface of the fixed side frame 22 facing the movable side frame 12 and are disposed between the fixed side frame 22 and the movable side frame 12.

  Each of the linear actuators 4 and 5 is arranged so that the movable part acts on the movable side frame 12, and is extended or shortened (in this embodiment, only the expansion and contraction is performed as described later). Thus, the corresponding position of the movable side frame 12 is pressed, and the pressing acts to rotate the movable side frame 12 (that is, the movable side unit 1). If the linear actuators 4 and 5 are arranged between the fixed side frame 22 and the movable side frame 12, the linear actuators 4 and 5 are fixed to the surface of the movable side frame 12 facing the fixed side frame 22. You may do it.

Next, a procedure for attaching the movable unit 1 to the fixed unit 2 will be described.
As shown in FIG. 2, the linear actuators 4 and 5 are attached to the fixed side frame 22. On the other hand, the gyro sensors 6 and 7 are arranged with respect to the lower frame 13 and the upper frame 14, and the camera unit 10 is sandwiched between the lower frame 13 and the upper frame 14 and attached to the movable frame 12. In this case, an assembly tool 25 made of a vertical U-shaped leaf spring is attached to the fixed side frame 22. The assembling tool 25 is provided at one corner on the side where the rotating shaft composed of the movable rotating shaft 11 and the fixed rotating shaft 21 is disposed. At the time of assembly, the movable unit 1 is brought into contact with the fixed unit 2 and the assembly tool 25 is passed over the movable frame 12.

  At the time of assembly, the urging member 9 is stretched over and attached to the fixed side frame 22 and the movable side frame 12 (see FIG. 1). The urging member 9 is made of an elastic body such as a compression coil spring, and is arranged at a corner facing the assembly tool 25 so that the movable frame 12 moves in the direction of the fixed frame 22. It is fast. That is, the urging member 9 urges the movable side frame 12 on the side opposite to the side where the assembly tool 25 is provided so that the movable side frame 12 is closed (in a direction approaching the fixed side frame 22). is there.

  By providing such an urging member 9, the linear actuators 4 and 5 need only be driven in the direction in which the movable frame 12 is opened (the direction away from the fixed frame 22). The electric circuit for supplying the battery can be simplified and reduced in size. Moreover, there is an advantage that the linear actuators 4 and 5 can be easily controlled.

  When the X-axis gyro sensor 6 and the Y-axis gyro sensor 7 detect the camera shake amount, the control means controls the X-axis rotation linear actuator 4 and the Y-axis rotation linear actuator 5 to control the camera shake amount. The movable side unit 1 is rotated so as to cancel out. This rotation can correct camera shake.

Camera shake correction according to the present embodiment will be described with reference to FIG.
FIG. 5 is a cross-sectional view taken along line AA in FIG. 4 and illustrates a case where camera shake occurs around the Y axis. FIG. 6A shows a state immediately after the aperture is opened by pressing a release button (not shown). At this time, when the camera is tilted, the optical axis K is tilted as shown in FIG. To do. The Y-axis gyro sensor 7 detects each speed at the tilt of the camera and outputs it to the control means. The control means drives the Y-axis rotating linear actuator 5 so that the movable side unit 1 (movable side frame 12) cancels out the shake amount around the rotation axis composed of the movable side rotation shaft 11 and the fixed side rotation shaft 21. Control to rotate around Y axis. Thereby, since the camera unit 10 attached to the movable unit 1 rotates around the Y axis, the lens and the sensor unit rotate integrally so as to cancel out the shake amount. As a result, as shown in FIG. 5C, the optical axis K can be made parallel to the Y axis, and camera shake can be corrected.

  FIG. 5 illustrates the camera shake rotated about the Y axis. However, for the camera shake rotated about the X axis, the X axis gyro sensor 6 and the X axis rotating linear actuator 5 are driven to correct the camera shake. When camera shake occurs in combination with the Y-axis and the X-axis, the X-axis gyro sensor 6, the X-axis rotation linear actuator 4, the Y-axis gyro sensor 7, and the Y-axis rotation linear actuator 5 are used. Drives to correct camera shake.

  According to this embodiment, since the lens and the image sensor rotate together to correct camera shake, optical deterioration such as optical camera shake correction does not occur, and sensor shift camera shake correction does not occur. There is no negative impact on machine accuracy. Moreover, since only the gyro sensors 6 and 7 for detecting the movement of the camera are used as the sensors to be used, the number of sensors can be reduced, and the X-axis gyro sensor 6, the X-axis rotation linear actuator 4, and the Y-axis gyro sensor. Since 7 and the Y-axis rotating linear actuator 5 are independent, the control becomes easy. Furthermore, even if the specifications of the lens and the image sensor are changed, the basic control for correcting the camera shake by rotating the lens and the image sensor as one unit is highly versatile and the mass production efficiency is improved.

  Further, since the biasing member 9 for biasing the movable side frame 12 to move in the direction of the fixed side frame 22 is provided, the X-axis rotating linear actuator 4 and the Y-axis rotating linear actuator 5 are moved in one direction. It is only necessary to drive, the electric circuit and the like are simplified and the size can be reduced, and the linear actuators 4 and 5 can be easily controlled.

<Second Embodiment>
6 to 8 show a camera shake correction device according to a second embodiment of the present invention.

  In this embodiment, the rotation restricting means 30 including the pin portion 31 and the groove portion 32 is provided. As shown in FIG. 8, the rotation restricting means 30 restricts the movable side frame 12 to rotate only around the X axis and the Y axis, which are two orthogonal axes. Therefore, the rotation restricting means 30 prevents the movable side frame 12 from rotating around the Z axis other than the X axis and the Y axis, so that the camera shake can be corrected more accurately.

  The pin portion 31 in the rotation restricting means 30 is attached to the fixed side frame 22, and the groove portion 32 is formed in the movable side frame 12. The pin portion 31 extends inward from the inner surface of the fixed side frame 22 so as to be parallel to the X axis and on the X axis. Further, the pin portion 31 is located at substantially the same height as the contact surface where the movable side rotating shaft 11 and the fixed side rotating shaft 21 are in contact. The groove portion 32 is a portion into which the pin portion 31 is inserted. The groove portion 32 prevents the inserted pin portion 31 from moving in the Y-axis direction.

  When the movable unit 1 is assembled to the fixed unit 2, the pin portion 31 is inserted into the groove portion 32, and the pin portion 31 and the groove portion 32 are engaged with each other. When the movable side unit 1 rotates around the X axis in this state, the movable side unit 1 rotates relative to the pin portion 31. On the other hand, when the movable side unit 1 rotates around the Y axis, the movable side unit 1 moves in the vertical direction along the groove portion 32 with the pin portion 31 as a guide. Therefore, since the rotation of the movable unit 1 can be restricted only in a direction that can be detected by the X-axis gyro sensor 6 and the Y-axis gyro sensor 7 by the pin portion 31 and the groove portion 32 that are engaged with each other. It becomes possible to correct to.

<Third Embodiment>
9 to 12 show a linear actuator according to a third embodiment of the present invention, FIG. 9 is an exploded perspective view, FIG. 10 is an assembled view, FIG. 11 is an explanatory view of operation, and FIG. 12 is a view showing operation. FIG. 10 is a sectional view taken along line BB of FIG.

  The linear actuator is used for the X-axis rotation linear actuator 4 and the Y-axis rotation linear actuator 5 in the above-described camera shake correction apparatus. As shown in FIG. 9, in the linear actuator, a fixed portion 45 is formed by a side yoke 41, a center yoke 42, and two magnets 43, and a movable portion 49 is formed by a coil 46 and a cap 47.

  The side yoke 41 of the fixed portion 45 has a shape in which two convex pieces 41b are erected from the left and right sides of the base piece 41a on the flat plate. As shown in FIG. 12, the magnet 43 is attached to the opposing surface of each convex piece 41 b in the side yoke 41. As shown in FIG. 11, each magnet 43 is provided such that the N pole is located inside and the S pole is located outside (the convex piece 41b side).

  The center yoke 42 rises from the base piece 41a of the side yoke 41 and is located between the two convex pieces 41b. Thereby, the center yoke 42 is inserted between the two magnets 43. In this case, the center yoke 42 passes through the center portion of the base piece 41a of the side yoke 41 and is in contact with the base piece 41a and is supported by the side yoke 41. The center yoke 42 and the side yoke 41 preferably have a high saturation magnetic flux density, and therefore, a ferromagnetic material is used.

  The coil 46 is an air-core coil formed in a cylindrical shape. A center yoke 42 passes through the coil 46. Guides 50 are provided above and below the coil 46. The guide 50 supports the coil 46 by being sandwiched from above and below and fixed by adhesion or the like. The linear actuator having such a structure has a voice coil structure.

  The cap 47 is fixed on the coil 46. That is, the cap 47 is fixed to the guide 50 on the upper side of the coil 46 by adhesion or the like. The cap 47 has substantially the same shape as the outer peripheral shape of the coil 46. In addition, a recess 47 a into which the center yoke 42 can enter is formed on the bottom surface of the cap 47.

  A protrusion 47 b is formed on the upper surface of the cap 47. The protrusion 47 b is spherical and protrudes from the upper surface of the cap 47. The protruding portion 47b comes into contact with the movable side frame 12, and can be in good contact with the movable side frame 12 by protruding in a spherical shape. Therefore, the operation of the linear actuator can be reliably transmitted to the movable side frame 12. In this case, the movable side frame 12 is preferably formed with a concave spherical receiving portion into which the spherical protrusion 47b enters. Since the receiving portion has a concave spherical shape, the spherical protruding portion does not reliably engage and come off. The cap 47 and the guide 50 described above are preferably made of a lightweight material such as plastic, and thus the movable portion 49 can be reduced in weight.

  In the linear actuator of the present embodiment, as shown in FIG. 12, the center yoke 42 is passed through the guide 50 and the coil 46, and the distal end portion of the center yoke 42 is inserted into the recess 47 a of the cap 47, thereby moving the movable portion 49. It is assembled to the fixed part 45. Since the center yoke 42 penetrates the coil 46 and the guide 50, the center yoke 42 also serves as a guide when the movable portion 49 moves linearly, and the movable portion 49 can ensure a linear movement with high accuracy.

FIG. 11 shows the relationship between magnetic flux and current when the linear actuator extends.
Two magnets 43 generate a magnetic flux flow indicated by an arrow J in the center yoke 42 and the side yoke 41. The coil 46 is disposed in this magnetic field. At this time, a current I is applied to the coil 46. The current I flows in the direction from the left side to the right side (counterclockwise direction when FIG. 11 is viewed from above). By applying this current I, an upward force acts on the coil 46. . Thereby, as shown in FIG. 12C, the movable portion 49 including the coil 46, the guide 50, and the cap 47 moves linearly upward along the center yoke 42. By this movement, the movable side frame 12 can be pushed. On the other hand, when the current I is applied in the reverse direction, a downward force is generated, and the movable portion 49 linearly moves downward as shown in FIG.

  Since such a linear actuator has a voice coil structure, the structure is simple, the size can be reduced, and control is also easy. Moreover, since the fixed part 45 and the movable part 49 are assembled into one unit, it is versatile and suitable for mass production.

<Fourth Embodiment>
FIGS. 13 to 16 show a linear actuator according to a fourth embodiment of the present invention, FIG. 13 is an exploded perspective view, FIG. 14 is an assembly diagram, FIG. 15 is an explanatory diagram of operation, and FIG. It is a CC sectional view taken on the line.

  In this embodiment, the fixed portion 45 is formed by the coil 46 and the guide 50, and the movable portion 49 is formed by the side yoke 41, the center yoke 42, the magnet 43 and the cap 47.

  The coil 46 serving as the fixing portion 45 is fixed to the base 52. A guide 50 is fixed to the coil 46 by adhesion or the like.

  In the side yoke 41 of the movable portion 49, two convex pieces 41b extend in the direction of the coil 46 from both sides of the base piece 41a. The two magnets 43 are attached to the opposing surface of the convex piece 41b. The center yoke 42 is disposed between the two convex pieces 41 b by being disposed between the magnets 43. The cap 47 acts on the movable frame 12 by being fixed to the upper surface of the base piece 41 a of the side yoke 41.

  FIG. 15 shows the operation of the linear actuator of this embodiment, and a magnetic field indicated by an arrow J is formed in the movable portion 49. At this time, a current I flowing from the right to the left is applied to the coil 46. As a result, as shown in FIG. 16C, the entire movable portion 49 including the side yoke 41, the magnet 43, the center yoke 42, and the cap 47 is linearly moved upward. By applying the current in the reverse direction, the entire movable portion 49 linearly moves downward. In such a linear movement in the vertical direction, since the center yoke 42 penetrates the coil 46, a linear movement with high accuracy can be performed.

  In the present embodiment, the coil 46 is not moved by providing the coil 46 in the fixed portion 45. For this reason, the lead wire for supplying current to the coil 46 can be fixedly wired. That is, wiring that leads the lead wire in consideration of the movement of the coil 46 becomes unnecessary. This simplifies mounting on the camera shake correction device and improves durability.

  The embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiments, and includes designs and the like that do not depart from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Movable side unit, 2 ... Fixed side unit, 4 ... Linear actuator for X axis rotation, 5 ... Linear actuator for Y axis rotation, 6 ... Gyro sensor for X axis, 7, ..Y-axis gyro sensor, 9 ... biasing member, 10 ... camera unit, 11 ... movable side fixed shaft, 12 ... movable side frame, 21 ... fixed side rotating shaft, 22・ ・ ・ Fixed side frame, 30 ... Rotation restricting means, 31 ... Pin part, 32 ... Groove part, 41 ... Side yoke, 41b ... Convex piece, 42 ... Center yoke, 43 ... Magnet, 45 ... Fixed part, 46 ... Coil, 47 ... Cap, 49 ... Moving part, 52 ... Base

The present invention relates to an image stabilizing optical system in a digital camera or the like.

The present invention is, when correcting camera shake, no adverse effect on the optical degradation and mechanical precision, is easy to control the correction, and an object thereof is to provide a is vibration hand can be miniaturized correction device.

The present invention proposes the following matters in order to solve the above problems.
(1) The present invention provides a camera unit including a lens and an image sensor, a movable side rotation shaft having a spherical end surface, and a movable side unit provided on the movable side frame. A fixed-side rotation shaft having a spherical surface in contact with the distal end portion formed on the distal end portion is provided on the fixed-side frame, and the movable-side unit is rotatably mounted between the movable-side frame and the fixed-side frame. A linear actuator that drives the movable side unit to rotate about two orthogonal axes, a camera shake detection unit that detects a camera shake amount about the two orthogonal axes, and the camera shake detection unit includes a camera when detecting the shake amount, and a control means for rotating the movable unit to the control the linear actuator canceling the shake amount It said spherical surface of said movable unit, wherein the spherical surface of the fixed side unit and proposes a camera-shake correction apparatus characterized that you have contacted from a direction parallel to the optical axis in a state of being biased to one another.

(2) The present invention, for image stabilization device (1), by the linear actuator expands and contracts driven in a direction parallel to the optical axis, Hisage the Rukoto rotated about two axes that are orthogonal to the movable unit I am planning.

(3) The present invention provides a camera unit including a lens and an image sensor, a movable side rotation shaft having a spherical end surface, and a movable side unit provided on the movable side frame. A fixed-side rotation shaft having a spherical surface in contact with the distal end portion formed on the distal end portion is provided on the fixed-side frame, and the movable-side unit is rotatably mounted between the movable-side frame and the fixed-side frame. A linear actuator that drives the movable side unit to rotate about two orthogonal axes, a camera shake detection unit that detects a camera shake amount about the two orthogonal axes, and the camera shake detection unit includes a camera Control means for controlling the linear actuator to rotate the movable unit so as to cancel the shake amount when the shake amount is detected. Wherein by stretching driven in a direction parallel to the optical axis of the linear actuator, it proposes a camera-shake correction apparatus according to claim Rukoto rotated about two axes that are orthogonal to the movable unit.

(4) In the camera shake correction device according to any one of (1) to (3), the present invention enables the movable side unit to be rotated about two axes in a direction perpendicular to the optical axis and parallel to the optical axis. rotation restriction means is proposed that is provided to regulate the so as not to rotate about the axis.

(5) According to the present invention, a camera unit including a lens and an image sensor, a movable side rotation shaft having a spherical end surface, a movable side unit provided on the movable side frame, and the movable side rotation shaft A fixed-side rotation shaft having a spherical surface in contact with the distal end portion formed on the distal end portion is provided on the fixed-side frame, and the movable-side unit is rotatably mounted between the movable-side frame and the fixed-side frame. A linear actuator that drives the movable side unit to rotate about two orthogonal axes, a camera shake detection unit that detects a camera shake amount about the two orthogonal axes, and the camera shake detection unit includes a camera Control means for controlling the linear actuator to rotate the movable unit so as to cancel the shake amount when the shake amount is detected. Said movable unit, thereby rotatable about two axes in the direction orthogonal to the optical axis, and wherein the rotation regulating means for regulating so as not to rotate about the axis parallel to the optical axis is found provided A camera shake correction device is proposed.

(6) In the camera shake correction device according to (5), the rotation restricting unit includes a pin portion attached to one frame and a groove portion formed in the other frame, and is engaged with each other. , it has proposed that you restrict rotation of the movable frame only two axes in the direction perpendicular to the optical axis.

Claims (7)

A movable unit in which a camera unit including a lens and an image sensor, and a movable rotating shaft having a spherical end surface are provided on the movable frame;
A fixed-side rotation shaft provided with a fixed-side rotation shaft having a spherical surface in contact with the tip of the movable-side rotation shaft formed at the tip, and the movable-side unit being rotatably attached;
A linear actuator that is disposed between the movable side frame and the fixed side frame and that drives the movable side unit to rotate around two orthogonal axes;
Camera shake detection means for detecting the camera shake amount around two orthogonal axes;
Control means for rotating the movable unit so as to cancel the shake amount by controlling the linear actuator when the shake detection means detects the shake amount of the camera;
A camera shake correction device comprising:   2. The camera shake correction device according to claim 1, wherein a biasing member that biases the movable side frame in the direction of the fixed side frame is stretched between the movable side frame and the fixed side frame.   3. A rotation restricting means that comprises a pin portion and a groove portion, and is provided with a rotation restricting means for restricting the rotation of the movable frame only around the two orthogonal axes by engaging with each other. Camera shake correction device.   4. The camera shake correction device according to claim 3, wherein in the rotation restricting unit, the pin portion extends in one axial direction of the two orthogonal axes, and the groove portion extends in the other axial direction. A fixed portion is formed by a side yoke having two convex pieces and a magnet attached to the opposite surface of the convex piece, and a center yoke provided on the side yoke so as to be positioned between the two convex pieces. ,
A linear actuator for use in a camera shake correction device, characterized in that a movable part is formed by a coil formed in a cylindrical shape and through which the center yoke passes and a cap attached to the tip of the coil. A side yoke having two convex pieces and a magnet attached to the opposite surface of the convex piece, a center yoke provided on the side yoke so as to be positioned between the two convex pieces, and an outer surface of the side yoke A movable part is formed by the attached cap,
A linear actuator used in a camera shake correction apparatus, wherein a fixed portion is formed by a coil formed in a cylindrical shape and through which the center yoke passes and a base that supports the coil.   7. The linear actuator used in the camera shake correction device according to claim 5, wherein the cap has a protruding portion that is spherical.

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