JP2008233524A - Actuator, lens unit equipped therewith, and camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an actuator capable of moving a lens for correcting image shake to a locking position by small drive force and holding it thereat. <P>SOLUTION: The actuator (10) preventing image shake by moving an imaging lens (16) is equipped with a fixed part (12), a movable part (14) to which the imaging lens is attached, a movable part supporting means (18), a driving means driving the movable part, a fixed magnetic means for locking (22) attached to the movable part, a moving magnetic means for locking (26b) attracted to the fixed magnetic means for locking and coming into contact therewith when the movable part is rotated and moved to a prescribed locking position, and elastic supporting means (26b) attached to the fixed part, elastically deformed by attractive force acting between the fixed magnetic means for locking and the moving magnetic means for locking when the movable part is rotated and moved to the locking position, and elastically supporting the moving magnetic means for locking so as to come into contact with the fixed magnetic means for locking. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an actuator, a lens unit including the actuator, and a camera, and more particularly to an actuator that translates an imaging lens in a plane perpendicular to the optical axis thereof to prevent image blur, and the actuator. It relates to a lens unit and a camera.

  Japanese Patent Laid-Open No. 9-61876 (Patent Document 1) describes a correction optical device. The correction optical device includes a correction lens that decenters the optical axis, and a lock ring that locks the correction lens. The lock ring has an annular shape surrounding the correction lens, and a cam portion that engages with the frame of the correction lens is formed on the inner periphery thereof. In this correction optical device, when the correction by the correction optical device is not performed, the lock ring surrounding the correction lens is rotated so that the cam portion formed on the inner periphery thereof and the outer peripheral portion of the frame of the correction lens are arranged. The correction lens is locked by engaging.

  On the other hand, Japanese Unexamined Patent Application Publication No. 2006-119249 (Patent Document 2) describes an actuator used for driving an image blur correction lens. In this actuator, by rotating the moving frame itself to which the image blur correction lens is attached, the engaging protrusion provided on the moving frame and the engaging protrusion receiving portion disposed around the moving frame are engaged. In combination, the image blur correction lens is locked at a predetermined position. In addition, this actuator is arranged around the moving frame corresponding to the movable side holding magnet, and the movable side holding magnet arranged on the outer periphery of the moving frame in order to hold the moving frame in the locking position. A fixed-side holding magnet is provided. When the image blur correction lens is locked, the engaging projection is pressed against the engaging projection receiving portion by the repulsive force of the movable side holding magnet and the fixed side holding magnet, so that the driving force of the actuator stops. Even after being moved, the moving frame is held in the locking position.

JP-A-9-61876 JP 2006-119249 A

  However, in the correction optical device described in Japanese Patent Laid-Open No. 9-61876, in order to drive the lock ring for locking the correction lens, a locking actuator is provided separately from the actuator for driving the correction lens. There is a problem that it must be provided.

  On the other hand, in the actuator described in Japanese Patent Application Laid-Open No. 2006-119249, the moving frame can be moved to the locking position using the actuator used for image blur correction, so it is necessary to provide a separate actuator for locking. Absent. However, in the actuator described in Japanese Patent Application Laid-Open No. 2006-119249, it is necessary to apply a large repulsive force between the movable side holding magnet and the fixed side holding magnet in order to hold the moving frame at the locking position. For this reason, in order to move the moving frame to the locking position against the repulsive force between the movable side holding magnet and the fixed side holding magnet, there is a problem that a very large driving force is required. In addition, since a linear motor is used to drive the moving frame, the linear motor becomes larger if a large driving force is to be secured even in the vicinity of the locking position far from the position for driving the moving frame for image blur correction. There is also the problem of doing.

  Therefore, according to the present invention, the image blur correction lens is moved to the locking position by a small driving force and held, or the image blur correction lens held at the locking position is returned to the image blur correction area. It is an object of the present invention to provide an actuator that can be used, a lens unit including the actuator, and a camera.

  In order to solve the above-described problems, the present invention provides an actuator for translating an imaging lens in a plane orthogonal to the optical axis thereof to prevent image blur, and includes a fixing unit and an imaging lens. An attached movable part, a movable part support means for supporting the movable part so that the movable part can be moved on a plane parallel to the fixed part, and for moving the movable part in translation and rotation relative to the fixed part Drive means, locking fixed magnetic means attached to one of the fixed part or the movable part, and provided corresponding to the locking fixed magnetic means, the movable part is rotationally moved to a predetermined locking position. And a locking moving magnetic means that is attracted to the locking fixed magnetic means and contacts the locking fixed magnetic means, and is attached to the other of the fixed portion or the movable portion, and the movable portion is rotated to the locking position. Then, the fixed magnetic means for locking and the locking The locking moving magnetic means is elastically supported by the attraction force acting between the moving magnetic means and the locking moving magnetic means is moved to a position where the locking moving magnetic means comes into contact with the locking fixed magnetic means. And an elastic support means.

  In the present invention configured as described above, the movable portion supported by the movable portion supporting means is translated by the driving means on a plane parallel to the fixed portion, thereby preventing image shake. When the movable part is locked, the movable part is rotationally moved to the locking position by the driving means. When the movable portion is rotationally moved to the locking position, the locking moving magnetic means elastically supported by the elastic supporting means is engaged with the locking fixed magnetic means by the attractive force acting between the locking fixing magnetic means. It is moved to a position where it contacts the means. As a result, the locking fixed magnetic means and the locking moving magnetic means are brought into contact and attracted, and the movable portion is held at the locking position.

  According to the present invention configured as described above, since the movable portion is held at the locking position by the adsorption of the locking fixed magnetic means and the locking moving magnetic means, the movable portion is held at the locking position with a small driving force. Can be moved to.

In this invention, Preferably, it has a stopper which restrict | limits the moving amount | distance of the moving magnetic means for latching further.
According to the present invention configured as described above, since the moving amount of the locking moving magnetic means is limited by the stopper, when the elastic supporting means is configured to be flexible, the attracted moving magnetic means for locking. It is possible to prevent the means from being separated from the locking fixed magnetic means.

  In the present invention, preferably, an engaging portion provided in the movable portion and a fixed portion corresponding to the engaging portion, and when the movable portion is rotationally moved to the locking position, And an engaging portion receiving portion to be abutted.

  According to the present invention configured as above, since the engaging portion and the engaging portion receiving portion come into contact with each other when the movable portion is rotationally moved to the locking position, the movable portion is rotated past the locking position. Can be prevented.

In the present invention, preferably, the moving magnetic means for locking and the elastic supporting means are integrally formed by a cantilever formed of a magnetic material, and the cantilever is moved when the movable part is rotated to the locking position. The beam is elastically bent and attracted to the locking fixed magnetic means.
According to the present invention configured as described above, the locking moving magnetic means and the elastic support means can be configured by a simple mechanism.

In the present invention, preferably, the driving means includes a driving coil attached to one of the fixed part or the movable part, and a driving magnet attached to the other of the fixed part or the movable part corresponding to the driving coil. It is composed of a linear motor equipped.
According to the present invention configured as described above, the movable portion can be directly driven with respect to the fixed portion.

In the present invention, it is preferable that the driving magnet also functions as a locking fixed magnetic means.
According to the present invention configured as described above, since the locking fixed magnetic means and the driving magnet for the linear motor can be used together, the actuator can be reduced in size.

In the present invention, preferably, there is further provided an attracting yoke for attracting the fixed portion and the movable portion by the magnetic force exerted by the driving magnet, and a part of the attracting yoke functions as a locking moving magnetic means.
According to the present invention configured as described above, the moving magnetic means for locking and the adsorption yoke can be used together, so that the actuator can be miniaturized.

  In the present invention, preferably, the attracting yoke is disposed on the opposite side of the driving magnet with respect to the driving coil, and one end of the attracting yoke extends toward the driving magnet beyond the driving coil. The cantilever is formed as a cantilever, and the tip of the cantilever is bent to be attracted to the end of the driving magnet.

  According to the present invention configured as described above, since the moving magnetic means for locking and the elastic support means can be configured as a part of the adsorption yoke, the structure of the actuator is simplified and the number of parts is reduced. be able to.

The lens unit of the present invention includes a lens barrel, a plurality of imaging lenses housed in the lens barrel, and an actuator of the present invention in which a part of these imaging lenses is attached to a movable part. It is characterized by having.
Furthermore, the camera of the present invention has a camera body and the lens unit of the present invention.

  According to the actuator of the present invention, and the lens unit and camera including the actuator, the image blur correction lens is moved to the locking position with a small driving force, or returned from the locking position to the image blur correction area. Can do.

Next, embodiments of the present invention will be described with reference to the accompanying drawings.
First, a camera according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a camera according to an embodiment of the present invention.

  As shown in FIG. 1, a camera 1 according to an embodiment of the present invention includes a lens unit 2 and a camera body 4. The lens unit 2 includes a lens barrel 6, a plurality of imaging lenses 8 disposed in the lens barrel, and an actuator that moves an image blur correction lens 16 of the imaging lenses within a predetermined plane. 10 and gyros 34a and 34b (only 34a is shown in FIG. 1) as vibration detecting means for detecting vibration of the lens barrel 6.

The lens unit 2 is attached to the camera body 4 and configured to form incident light on the film surface F.
The generally cylindrical lens barrel 6 holds a plurality of imaging lenses 8 therein, and allows focus adjustment by moving some imaging lenses 8.

  The camera 1 according to the embodiment of the present invention detects vibrations by the gyros 34 a and 34 b, operates the actuator 10 based on the detected vibrations to move the image blur correction lens 16, and moves the film surface in the camera body 4. The image focused on F is stabilized. In the present embodiment, piezoelectric vibration gyros are used as the gyros 34a and 34b. In the present embodiment, the image blur correction lens 16 is constituted by a single lens, but the lens for stabilizing the image may be a plurality of lens groups.

  Next, the configuration of the actuator 10 will be described with reference to FIGS. FIG. 2 is a front view of the actuator 10 in which the moving frame is at the operation center position of the image blur prevention control. FIG. 3 is a front view of the actuator 10 with the moving frame in the locking position. 4 is a side sectional view taken along line IV-IV in FIG. 3, and FIG. 5A is a side sectional view taken along line V-V in FIG. FIG. 5B is a perspective view showing a magnetized state of the driving magnet.

  As shown in FIGS. 2 to 5, the actuator 10 includes a fixed frame 12 that is a fixed portion fixed in the lens barrel 6 and a movable portion that is supported movably with respect to the fixed frame 12. It has a frame 14 and three steel balls 18 which are movable part supporting means for supporting the moving frame 14. The fixed frame 12 is provided with three engagement receiving portions 15 extending radially inward from the outer periphery thereof, and the moving frame 14 is provided with three engagement receiving portions 15 so as to be engaged with the respective engagement receiving portions 15. A portion 17 is provided. Further, the fixed frame 12 is provided with three stoppers 19 extending radially inward from the outer periphery.

  Further, the actuator 10 includes three driving coils 20a, 20b, and 20c attached to the fixed frame 12, and three drives attached to the moving frame 14 at positions corresponding to the driving coils 20a, 20b, and 20c, respectively. Magnets 22a, 22b, and 22c.

  Further, as shown in FIG. 5A, the actuator 10 is provided with an attracting member attached to the fixed frame 12 so that the moving frame 14 is attracted to the fixed frame 12 by the magnetic force of each driving magnet 22a, 22b, 22c. A yoke 26 and a back yoke 28 attached to the back side of the drive magnet so as to effectively direct the magnetic force of the drive magnet toward the fixed frame 12 are included. Further, as shown in FIG. 4, the actuator 10 has an attracting magnet 30 that attracts the steel ball 18 to the moving frame 14. The driving coils 20a, 20b, and 20c and the three driving magnets 22a, 22b, and 22c attached to the corresponding positions constitute a linear motor, and the movable frame 14 is translated with respect to the fixed frame 12. And functions as a driving means that can be rotated.

  Further, as shown in FIG. 5 (a), Hall elements 24a, 24b, and 24c, which are magnetic sensors, are arranged inside the windings of the drive coils 20a, 20b, and 20c (FIG. 5). Only 24a is shown). Each Hall element 24a, 24b, 24c detects the magnetism of each driving magnet 22a, 22b, 22c arranged so as to face each other, and detects the position of the moving frame 14 with respect to the fixed frame 12. It is configured. These Hall elements 24a, 24b, 24c and the drive magnets 22a, 22b, 22c constitute position detecting means.

  Further, as shown in FIG. 1, the actuator 10 includes each drive coil 20a based on the vibration detected by the gyros 34a and 34b and the positional information of the moving frame 14 detected by the Hall elements 24a, 24b and 24c. , 20b, 20c has a controller 36 which is a control means for controlling the current to flow. Further, the controller 36 has a built-in locking position moving means 37 for moving the moving frame 14 to the locking position that is the target position.

  The actuator 10 moves the moving frame 14 with respect to the fixed frame 12 fixed to the lens barrel 6 in a plane parallel to the film surface F, and thereby the image blur correction lens attached to the moving frame 14. 16 is moved so that the image formed on the film surface F is not disturbed even if the lens barrel 6 vibrates.

  As shown in FIG. 2, the fixed frame 12 has a generally donut plate shape with an edge on the outer periphery. Further, as shown in FIG. 5A, the fixed frame 12 is configured by superimposing the circuit board 12a to which each driving coil is attached and the fixed frame main body 12b in which the suction yoke 26 is embedded. ing.

  As shown in FIG. 2, the moving frame 14 has a generally donut plate shape, and is arranged in the fixed frame 12 so as to be surrounded by the edge of the fixed frame 12. An image blur correction lens 16 is attached to the central opening of the moving frame 14.

  Three engagement receiving portions 15 are formed so as to extend radially inward from the outer periphery of the fixed frame 12. Further, the respective engagement receiving portions 15 are arranged at intervals of 120 ° in the circumferential direction of the fixed frame 12.

  On the other hand, three engaging portions 17 are formed on the moving frame 14 at intervals of 120 ° in the circumferential direction of the moving frame 14 so as to contact the respective engagement receiving portions 15. Each engagement portion 17 is configured to come into contact with the contact receiving surface 15a of each engagement receiving portion 15 at the contact surface 17a.

  As shown in FIG. 4, the steel ball 18 is disposed between the fixed frame 12 and the moving frame 14. Further, as shown in FIGS. 2 and 3, three steel balls 18 are arranged at intervals of a central angle of 120 ° so that each steel ball 18 is positioned between the drive coils. Is arranged. Each steel ball 18 is attracted to the moving frame 14 by an attracting magnet 30 (FIG. 4) embedded in the moving frame 14 at a position corresponding to each steel ball 18. Each steel ball 18 is attracted to the moving frame 14 by the attracting magnet 30, and the moving frame 14 is attracted to the fixed frame 12 by the driving magnet 22, so that each steel ball 18 is interposed between the fixed frame 12 and the moving frame 14. It will be pinched. As a result, the moving frame 14 is supported on a plane parallel to the fixed frame 12, and the rolling motion of the moving frame 14 with respect to the fixed frame 12 in any direction is allowed by rolling while the steel balls 18 are sandwiched. Is done.

  In this embodiment, a steel sphere is used as the steel ball 18, but the steel ball 18 is not necessarily a sphere. That is, if the portion that contacts the fixed frame 12 and the moving frame 14 during the operation of the actuator 10 has a substantially spherical shape, the steel ball 18 can be used. In addition, in this specification, such a form is called a spherical body.

  The three driving coils 20a, 20b, and 20c are arranged on the circuit board 12a of the fixed frame 12, respectively. The driving coils 20 a, 20 b, and 20 c are arranged at their centers on the circumference centered on the optical axis of the lens unit 2. In the present embodiment, the drive coil 20a is disposed vertically above the optical axis, and the drive coils 20b and 20c are disposed with a central angle of 120 ° from the drive coil 20a. That is, the driving coils 20a, 20b, and 20c are arranged at equal intervals on a circumference centered on the optical axis. The driving coils 20a, 20b, and 20c are arranged such that their windings are wound in a rectangular shape with rounded corners, and the center line of the rectangle coincides with the radial direction of the circumference.

  The drive magnets 22a, 22b, and 22c each have a rectangular shape and are embedded in the moving frame 14. The driving magnets 22a, 22b, and 22c are positioned at positions corresponding to the driving coils 20a, 20b, and 20c on the circumference of the moving frame 14. In the present specification, the position corresponding to the driving coil means a position where the influence of the magnetic field formed by the driving coil is substantially reached.

  The three suction yokes 26 are respectively attached to the back side of each driving coil of the fixed frame 12, that is, on the opposite side of the moving frame 14. Each attracting yoke 26 is attracted by the magnetic force of each driving magnet 22 a, 22 b, 22 c arranged corresponding thereto, and thereby the moving frame 14 is attracted to the fixed frame 12. In the present embodiment, the fixed frame 12 is made of a non-magnetic material so that the magnetic lines of force of the driving magnet can efficiently reach the attraction yoke 26.

  Each suction yoke 26 has a substantially rectangular rectangular portion 26a and an elongated cantilever 26b formed integrally and continuously from the rectangular portion 26a. The cantilever 26b penetrates the fixed frame 12 from one short side of the rectangular portion 26a and extends toward the driving magnet 22a beyond the driving coil 20a. The cantilever 26b has a proximal end curved in a convex shape toward the back side of the fixed frame 12, and then passes through the fixed frame 12 from the back side to the front side. It extends near the side. In the present embodiment, the suction yoke 26 is formed of a thin steel plate having a thickness of about 0.2 mm.

  The back yoke 28 has a substantially rectangular shape, and is disposed on the back side of the three drive magnets. Further, as shown in FIG. 5A, each back yoke 28 is provided on the back side of each driving magnet, that is, each side so that the magnetic flux of each driving magnet is efficiently directed toward the fixed frame 12. They are respectively attached to the opposite sides of the drive coil (FIGS. 2 and 3 show a state where the back yoke 28 is removed).

  Next, with reference to FIGS. 6 and 7, a detailed configuration of the attachment portion of the suction yoke 26 and the back yoke 28 will be described. 6A is an enlarged perspective view showing a portion where the back yoke 28 is attached to the moving frame 14, and FIG. 6B is an enlarged perspective view showing an portion where the suction yoke 26 is attached to the fixed frame 12. As shown in FIG. . FIG. 7 is an exploded perspective view of a portion where the suction yoke 26 and the back yoke 28 are attached. 6 and 7 show a portion where the driving coil 20a and the driving magnet 22a are arranged, but the other two sets of driving coils and driving magnets are similarly arranged. It is configured.

  As shown in FIGS. 6 and 7, the portion of the moving frame 14 to which the drive magnet 22a is attached is formed to have the same thickness as the drive magnet 22a. Further, a rectangular cutout 14a is formed in the drive magnet 22a mounting portion of the moving frame 14, and the drive magnet 22a is fitted into the cutout 14a. Further, the notch 14a is formed shallow on one side (left side in FIG. 7), and on the shallow side of the notch 14a, a part of the short side of the drive magnet 22a protrudes outside the notch 14a.

  Further, the back yoke 28 includes a substantially rectangular rectangular portion 28a and leg portions 28b protruding in an arc shape from both sides of the rectangular portion. The rectangular portion 28a is disposed so as to cover the portion of the moving frame 14 where the driving magnet 22a is fitted, and the leg portion 28b is disposed along the outer periphery of the image blur correction lens 16 attached to the moving frame 14. Is done.

  A recessed portion 12c is formed in the fixed frame main body 12b at a portion where the attracting yoke 26 of the fixed frame 12 is embedded, and the rectangular portion 26a of the attracting yoke 26 is dropped into the recessed portion 12c. The circuit board 12a and the fixed frame main body 12b of the fixed frame 12 are formed with a substantially rectangular through hole 12d adjacent to the recess 12c for allowing the cantilever 26b of the suction yoke 26 to pass therethrough. The cantilever 26 b extends from the back side of the fixed frame 12 to the front side through the through hole 12 d and protrudes substantially perpendicularly to the fixed frame 12.

  Three stoppers 19 are arranged on the circuit board 12 a so as to extend radially inward from the outer periphery of the fixed frame 12. The stoppers 19 are arranged at intervals of 120 ° in the circumferential direction of the fixed frame 12. Further, each stopper 19 is formed with a U-shaped notch 19a positioned so as to surround the through hole 12d of the fixed frame 12, and the cantilever 26b moves through the notch 19a. Projects toward the frame 14. For this reason, the elastic bending deformation of the cantilever 26 b is limited by the stopper 19.

  Next, the magnetic force exerted by the drive magnet will be described with reference to FIGS. The drive magnets 22a, 22b, 22c, the back yoke 28, and the attracting yoke 26, which are each formed in a substantially rectangular shape, are arranged so that their long sides and short sides overlap each other. The driving coils 20a, 20b, and 20c are arranged such that their sides are parallel to the long and short sides of the rectangular back yoke 28, respectively. Further, each drive magnet is oriented such that the magnetization boundary line C, which is the boundary line between the magnetic poles, coincides with the radial direction of the circumference where each drive magnet is disposed.

  Thereby, the drive magnet 22a, the back yoke 28, and the attracting yoke 26 constitute a magnetic circuit, and magnetic lines of force indicated by arrows in FIG. 5A are formed. When a current flows through the corresponding driving coil 20a, the driving magnet 22a receives a driving force in the tangential direction of the circumference where the driving magnets are arranged. For the other driving coils 20b and 20c, corresponding driving magnets 22b and 22c, a back yoke 28, and an attracting yoke 26 are arranged in the same positional relationship.

  In this specification, the magnetization boundary line C refers to the boundary line of the magnetized magnetic poles when both ends of the drive magnet are magnetized so as to be S pole and N pole, respectively. Shall. Therefore, in this embodiment, the magnetization boundary line C is located so as to pass through the midpoint of the long side of the rectangular driving magnet. Further, as shown in FIG. 5B, the polarity of the driving magnet 22a also changes in the thickness direction. In FIG. 5B, the lower left corner is the S pole, the lower right corner is the N pole, The upper left is the N pole and the upper right is the S pole.

  Next, with reference to FIG.5 and FIG.8, the drive force which each drive magnet receives is demonstrated. FIG. 8A is a graph showing the relationship between the relative position of the driving coil and the driving magnet and the driving force received by the driving magnet. FIGS. 8B to 8E show b in the graph. The relative positions of the driving coil and the driving magnet at points e to e are shown.

  First, as shown in FIG. 5A, the right half, which is the first magnet portion 22a1, of the driving magnet 22a is connected to the right end portion, which is the first winding portion 20a1, of the driving coil 20a. ) Exerts magnetic field lines from the top to the bottom. Similarly, the left half portion that is the second magnet portion 22a2 of the driving magnet 22a has a magnetic field line that extends from below to above in FIG. 5A on the left end portion that is the second winding portion 20a2 of the driving coil 20a. Effect.

  On the other hand, when a current in a direction indicated by an arrow in FIG. 8B flows through the driving coil 20a, a current flows from the back of FIG. 5A toward the front side in the first winding portion 20a1 of the driving coil 20a. Flows, and a current flows through the second winding portion 20a2 from the near side of FIG. When such a current flows in the magnetic field formed by the driving magnet 22a, a driving force for moving the driving magnet 22a in the right direction in FIG. 5A is generated.

  As shown in FIG. 8A, this driving force is obtained when the driving magnet 22a and the driving coil 20a are in the positional relationship shown in FIG. 8B, that is, the magnetization boundary line C of the driving magnet 22a. Is maximized when it is located at the center of the drive coil 20a. Further, the driving force decreases as the driving magnet 22a shifts to the right or left from the maximum position. Further, when the driving magnet 22a is moved rightward to the position shown in FIG. 8C (point c in FIG. 8A), the driving force becomes zero. When the driving magnet 22a is further moved and reaches the position shown in FIG. 8D (point d in FIG. 8A), the direction of the driving force is reversed, and the driving magnet 22a is driven in the left direction. To receive. Thus, in the state where the driving force is reversed, the driving magnet 22a receives only the driving force generated between the second magnet portion 22a2 and the first winding portion 20a1 of the driving coil 20a. Therefore, the maximum value of the driving force in the region where the driving force is reversed is smaller than the driving force in the state of FIG.

  On the other hand, when the driving magnet 22a is moved leftward, the driving force decreases and becomes zero at the position shown in FIG. 8E (point e in FIG. 8A). Further, when the driving magnet 22a is further moved leftward, the direction of the driving force is reversed, and the driving magnet 22a receives the leftward driving force.

  The driving force described above is for the case where the clockwise current in FIG. 8B flows through the driving coil 20a. When the counterclockwise current flows through the driving coil 20a, the driving force is as follows. All the directions are reversed. That is, when a counterclockwise current flows through the driving coil 20a, a leftward driving force is generated in the region from the point e to the point c in FIG. In the region on the right side of the point c, a right driving force is generated. In the above description, the driving force generated between the driving coil 20a and the driving magnet 22a has been described. However, the driving force generated between the other two sets of driving coils and the driving magnet is exactly the same. is there.

  Further, in the actuator 10 of the camera 1 according to the present embodiment, the first winding portion of the driving coil and the first magnet portion of the driving magnet, and the second winding portion and the second magnet portion face each other, and sufficient driving is performed. Image blur prevention control is executed in a normal operation region where a force is generated.

Next, position detection of the moving frame 14 will be described with reference to FIGS.
9 and 10 are diagrams for explaining the relationship between the movement of the driving magnet 22a and the signal output from the Hall element 24a. As shown in FIG. 9, when the sensitivity center point S of the Hall element 24a is located on the magnetization boundary line C of the driving magnet 22a, the output signal from the Hall element 24a is zero. When the driving magnet 22a is moved together with the moving frame 14, and the sensitivity center point of the Hall element 24a deviates from the magnetization boundary line of the driving magnet 22a, the output signal of the Hall element 24a changes. As shown in FIG. 9, when the driving magnet 22a moves in the direction orthogonal to the magnetization boundary line C, that is, in the X-axis direction, the Hall element 24a generates a sinusoidal signal. Therefore, when the amount of movement is small, the Hall element 24a outputs a signal that is substantially proportional to the distance of movement of the driving magnet 22a. In the present embodiment, when the moving distance of the driving magnet 22a is within about 3% of the length of the long side of the driving magnet 22a, the signal output from the Hall element 24a is the sensitivity center of the Hall element 24a. This is approximately proportional to the distance between the point S and the magnetization boundary line C of the driving magnet 22a. In the present embodiment, the actuator 10 operates within a range in which the output of each Hall element is substantially proportional to the distance in the normal operation region.

  As shown in FIGS. 10A to 10C, when the magnetization boundary line C of the driving magnet 22a is positioned on the sensitivity center point S of the Hall element 24a, the driving is performed as shown in FIG. When the magnet 22a for rotation is rotated, the output signal from the Hall element 24a is zero even when the magnet for driving 22a is moved in the direction of the magnetization boundary line C as shown in FIG. Further, as shown in FIGS. 10D to 10F, when the magnetization boundary line C of the driving magnet 22a deviates from the sensitivity center point S of the Hall element 24a, the sensitivity center point S and the magnetization boundary line are separated. A signal proportional to the distance r of the line C is output from the Hall element 24a. Therefore, if the distance r from the sensitivity center point S to the magnetization boundary line C is the same, when the driving magnet 22a moves in a direction perpendicular to the magnetization boundary line C as shown in FIG. When the drive magnet 22a is translated and rotated as shown in FIG. 10 (e), or when it is translated in any direction as shown in FIG. 10 (f), the same magnitude signal is output from the Hall element 24a. Is done.

  Although the Hall element 24a has been described here, the other Hall elements 24b and 24c also output similar signals based on the positional relationship with the corresponding driving magnets 22b and 22c. For this reason, based on the signals detected by the Hall elements 24a, 24b, and 24c, the position where the moving frame 14 is translated and rotated with respect to the fixed frame 12 can be specified.

  Next, image blur prevention control by the actuator 10 will be described with reference to FIG. FIG. 11 is a block diagram showing signal processing in the controller 36. As shown in FIG. 11, the vibration of the lens unit 2 is detected momentarily by the two gyros 34 a and 34 b and is input to arithmetic circuits 38 a and 38 b that are lens position command signal generation means built in the controller 36. In the present embodiment, the gyro 34a is configured and arranged to detect the angular velocity of the yawing motion of the lens unit 2, and the gyro 34b is configured to detect the angular velocity of the pitching motion.

  The arithmetic circuits 38a and 38b generate lens position command signals for instructing in time series the position to which the image blur correction lens 16 should be moved, based on the angular velocities input from the gyros 34a and 34b every moment. That is, the arithmetic circuit 38a time-integrates the angular velocity of the yawing motion detected by the gyro 34a and corrects predetermined optical characteristics to generate the horizontal component Dx of the lens position command signal. Similarly, the arithmetic circuit 38b Is configured to generate the vertical component Dy of the lens position command signal based on the angular velocity of the pitching motion detected by the gyro 34b. Even if the lens unit 2 vibrates during exposure for photography by moving the image blur correction lens 16 momentarily according to the lens position command signal thus obtained, the film surface in the camera body 4 The image focused on F is stabilized without being disturbed.

  The coil position command signal generating means built in the controller 36 is configured to generate a coil position command signal for each driving coil based on the lens position command signal generated by the arithmetic circuits 38a and 38b. The coil position command signal is obtained when each of the drive coils 20a, 20b, 20c and the corresponding drive magnets 22a, 22b, 22c when the image blur correction lens 16 is moved to the position specified by the lens position command signal. It is a signal showing the positional relationship. That is, when each driving magnet is moved to the position commanded by the coil position command signal for each driving coil, the image blur correction lens 16 is moved to the position commanded by the lens position command signal. Is done. In the present embodiment, since the driving coil 20a is provided vertically above the optical axis, the coil position command signal ra for the driving coil 20a is a horizontal component of the lens position command signal output from the arithmetic circuit 38a. It becomes equal to Dx. Accordingly, the arithmetic circuit 40a, which is a coil position command signal generating means for generating a coil position command signal for the driving coil 20a, outputs the output as it is from the arithmetic circuit 38a. On the other hand, the coil position command signals rb and rc for the drive coils 20b and 20c are generated by arithmetic circuits 40b and 40c, which are coil position command signal generation means, based on the horizontal component Dx and the vertical component Dy of the lens position command signal. Generated.

  On the other hand, the movement amount of the driving magnet with respect to each driving coil, measured by the Hall elements 24a, 24b, and 24c, is amplified to a predetermined magnification by the magnetic sensor amplifiers 42a, 42b, and 42c. The drive circuits 44a, 44b, 44c differ in the difference between the coil position command signals ra, rb, rc output from the arithmetic circuits 40a, 40b, 40c and the signals output from the magnetic sensor amplifiers 42a, 42b, 42c. A proportional current is passed through each drive coil 20a, 20b, 20c. Therefore, when there is no difference between the coil position command signal and the output from each magnetic sensor amplifier, that is, when each drive magnet reaches the position commanded by the coil position command signal, no current flows through each drive coil. The driving force acting on the driving magnet becomes zero. The changeover switch 45 disposed between the arithmetic circuits 40a, 40b, and 40c and the drive circuits 44a, 44b, and 44c is always in a position that directly connects the arithmetic circuit and the drive circuit in the image blur prevention control mode. Yes.

  Next, the relationship between the lens position command signal and the coil position command signal when the moving frame 14 is translated will be described with reference to FIG. FIG. 12 is a diagram illustrating a positional relationship between the driving coils 20 a, 20 b, 20 c arranged on the fixed frame 12 and the driving magnets 22 a, 22 b, 22 c arranged on the moving frame 14. First, the center points of the three drive coils 20a, 20b, and 20c are arranged on the points Sa, Sb, and Sc on the circumference of the radius R with the point Q as the origin. The Hall elements 24a, 24b, and 24c are also arranged so that their sensitivity center points S are located on the points Sa, Sb, and Sc. Further, when the moving frame 14 is at the operation center position, the center of the image blur correcting lens 16 and the optical axis of the imaging lens 8 coincide, and the magnetization boundary of each driving magnet corresponding to each driving coil. The midpoint of the line C is also located on each of the points Sa, Sb, and Sc, and each magnetization boundary line C is directed in the radial direction of a circle centered on the point Q. The moving frame 14 is translated around the operation center position, and image blur prevention control is executed.

  Next, the horizontal axis with the point Q as the origin is the X axis, the vertical axis is the Y axis, and the center point Q1 of the image stabilizing lens 16 is Dy, X in the Y axis direction as shown by the solid line in FIG. Consider a case in which -Dx translation is performed in the axial direction. When the moving frame 14 is moved in this way, the magnetization boundary line C of each of the drive magnets 22a, 22b, and 22c is moved to the position indicated by the alternate long and short dash line in FIG. Here, the distance between the magnetization boundary line C of the driving magnet 22a and the point Sa is ra, the distance between the magnetization boundary line C of the driving magnet 22b and the point Sb is rb, and the driving magnet 22c Let rc be the distance between the magnetization boundary line C and the point Sc. The distances ra, rb, and rc correspond to the movement distances detected by the hall elements 24a, 24b, and 24c when the image stabilizing lens 16 is moved in the Y-axis direction by Dy and in the X-axis direction. . These distances ra, rb, and rc are uniquely determined with respect to the movement distances Dx and Dy in the X-axis direction and the Y-axis direction. Therefore, in order to move the image stabilizing lens 16 in the X-axis direction and the Y-axis direction by Dx and Dy, respectively, the distances ra, rb, and rc corresponding thereto may be given as coil position command signals.

図１１において説明した各演算回路４０ａ、４０ｂ、４０ｃは、夫々上記数式１に対応する演算を実行して、各コイル位置指令信号を生成している。 Here, if the positive directions of the distances ra, rb, and rc are defined as indicated by arrows a, b, and c in FIG. 12, the relationship between ra, rb, and rc and Dx and Dy is as follows (Formula 1): Given in.

Each of the arithmetic circuits 40a, 40b, and 40c described in FIG. 11 performs an operation corresponding to the above Equation 1, and generates each coil position command signal.

によって与えられる。このように、各駆動用磁石が各駆動用コイルに対して同一距離接線方向に移動されることにより、移動枠１４は、像振れ補正用レンズ１６の光軸と撮像用レンズ８の光軸が一致した状態を保持しながら、光軸を中心に回転される。 Next, a coil position command signal when the moving frame 14 is rotated will be described. In order to rotate the moving frame 14, the same value may be given as each coil position command signal. That is, each coil position command signal for rotating the moving frame 14 clockwise by an angle θ [rad] is:

Given by. In this way, each drive magnet is moved in the tangential direction at the same distance with respect to each drive coil, so that the moving frame 14 has an optical axis of the image blur correction lens 16 and an optical axis of the imaging lens 8. It is rotated around the optical axis while maintaining the coincidence state.

  Next, the operation of the camera 1 according to the embodiment of the present invention will be described with reference to FIGS. First, an actuator 10 provided in the lens unit 2 is operated by turning on a start switch (not shown) for the camera shake prevention function of the camera 1. The gyros 34a and 34b attached to the lens unit 2 detect vibrations in a predetermined frequency band every moment and output them to the arithmetic circuits 38a and 38b built in the controller 36. The gyro 34a outputs an angular velocity signal in the yawing direction of the lens unit 2 to the arithmetic circuit 38a, and the gyro 34b outputs an angular velocity signal in the pitching direction to the arithmetic circuit 38b. The arithmetic circuit 38a integrates the input angular velocity signal with respect to time to calculate a yawing angle, and adds a predetermined optical characteristic correction thereto to generate a horizontal lens position command signal Dx. Similarly, the arithmetic circuit 38b integrates the input angular velocity signal with respect to time to calculate a pitching angle, adds a predetermined optical characteristic correction thereto, and generates a vertical lens position command signal Dy. An image focused on the film surface F of the camera body 4 by moving the image blur correction lens 16 momentarily to a position commanded by a lens position command signal output in time series by the arithmetic circuits 38a and 38b. Is stabilized.

  The horizontal lens position command signal Dx output by the arithmetic circuit 38a is output as a coil position command signal ra for the driving coil 20a via the arithmetic circuit 40a. Further, the horizontal lens position command signal Dx and the vertical lens position command signal Dy are input to the arithmetic circuit 40b, and a coil position command signal rb for the drive coil 20b is generated based on the middle expression of Equation 1. Is done. Similarly, the lens position command signals Dx and Dy are input to the arithmetic circuit 40c, and the coil position command signal rc for the drive coil 20c is generated based on the lower expression of Expression 1.

  On the other hand, the Hall element 24a corresponding to the driving coil 20a outputs a detection signal to the magnetic sensor amplifier 42a. The detection signal amplified by the magnetic sensor amplifier 42a is subtracted from the coil position command signal ra for the drive coil 20a, and a current proportional to these differences is output to the drive coil 20a via the drive circuit 44a. Similarly, a current proportional to the difference between the detection signal of the hall element 24b and the coil position command signal rb is output to the driving coil 20b via the drive circuit 44b, and the difference between the detection signal of the hall element 24c and the coil position command signal rc. Is output to the drive coil 20c via the drive circuit 44c.

  When a current flows through each driving coil, a magnetic field proportional to the current is generated. Due to this magnetic field, each driving magnet arranged corresponding to each driving coil receives a driving force in a direction approaching the position specified by the coil position command signals ra, rb, rc, and the moving frame 14 is moved. The When the driving magnet reaches the position specified by the coil position command signal by this driving force, the coil position command signal and the detection signal of the Hall element coincide with each other, so the output of the driving circuit becomes zero and the driving force also becomes zero. In addition, when each driving magnet deviates from the position specified by the coil position command signal due to a disturbance or a change in the coil position command signal, a current flows again to each driving coil. The position is returned to the position specified by the position command signal.

  By repeating the above operation every moment, the image blur correction lens 16 attached to the moving frame 14 having each driving magnet is moved so as to follow the lens position command signal. Thereby, the image focused on the film surface F of the camera body 4 is stabilized.

  Next, with reference to FIGS. 13 to 18 again, in the camera 1 according to the embodiment of the present invention, an operation when the moving frame 14 of the actuator 10 is moved to the locking position will be described. FIG. 13 to FIG. 18 are diagrams showing an action when the moving frame 14 is moved to the locking position or returned from the locking position. 13 to 18 show the engagement receiving portion 15 and the engagement portion 17 for the sake of explanation, this is because the moving frame 14 is moved to the position of each figure with respect to the fixed frame 12. FIG. 2 shows the relative positions of the engagement receiving portion 15 and the engagement portion 17 when the engagement receiving portion 15 and the engagement portion 17 are actually used. It is provided at a position away from the magnet.

  As described above, the actuator 10 translates the moving frame 14 around the operation center position shown in FIG. 2 during image blur prevention control, and stabilizes the image. On the other hand, when the image blur prevention control is not executed or when the camera 1 is not used, the moving frame 14 is moved to the locking position shown in FIG. In the present embodiment, the locking position is set to a position obtained by rotating the moving frame 14 counterclockwise around the optical axis of the image blur correction lens 16 from the operation center position shown in FIG. In this locking position, the three engaging portions 17 provided on the movable frame 14 abut on the three engaging receiving portions 15 provided on the fixed frame 12 and cantilever the suction yokes 26. The tip of the beam 26b is attracted to and brought into contact with the side surfaces of the drive magnets 22a, 22b, and 22c. In this manner, the moving frame 14 is held at the locking position by the tip of the cantilever 26b being attracted to the driving magnet.

  Therefore, in this embodiment, the tip of the cantilever 26b functions as a moving magnetic means for locking, and the cantilever 26b is elastically bent to thereby move the tip of the cantilever 26b (moving magnetic for locking). It functions as an elastic support means for elastically supporting the means). On the other hand, each driving magnet is attached to the moving frame 14, and functions as a locking fixed magnetic means for attracting the tip end portion (the locking moving magnetic means) of the cantilever 26b.

  First, when the start switch (not shown) for the camera shake prevention function of the camera 1 is turned off or the power switch (not shown) of the camera 1 is turned off, the locking position built in the controller 36 is set. The moving means 37 (FIG. 11) moves the moving frame 14 toward the locking position. That is, the controller 36 switches the changeover switch 45 to the locking position moving means 37 side, and the locking position moving means 37 outputs a coil position command signal for moving the moving frame 14 to the locking position. Specifically, by applying the same coil position command signal to each of the drive coils 20a, 20b, and 20c, the moving frame 14 is centered on the optical axis of the image blur correction lens 16 and is counterclockwise in FIG. Rotated around.

  First, when the moving frame 14 is centered on the operation center position shown in FIG. 2, the driving magnet 22a and the tip of the cantilever 26b are in the positional relationship shown in FIG. At this position, the driving magnet 22a and the tip of the cantilever beam 26b are sufficiently separated from each other, so that an attraction force does not substantially act between them.

  FIG. 13 shows a state in which the driving magnet 22a and the tip of the cantilever 26b are closest to each other during the image blur prevention control, but the driving magnet 22a and the cantilever 26b are also in this position. The adsorption force does not substantially act between them, and the engaging portion 17 and the engagement receiving portion 15 do not come into contact with each other. Therefore, the attractive force acting between the driving magnet 22a and the cantilever 26b does not adversely affect the image blur prevention control.

  FIG. 14 shows a state in which the moving frame 14 has been moved to the locking position by the coil position command signal of the locking position moving means 37. In this state, the three sets of engaging portions 17 and the engagement receiving portion 15 are engaged with each other. For this reason, the moving frame 14 is not rotated past the locking position. Further, as shown in FIG. 14, when the cantilever 26b is in the initial position (the position where it is not elastically deformed), even when the movable frame 14 is rotated to the locking position, There is still a gap between the tip and the driving magnet 22a.

  Here, when the moving frame 14 is moved to the locking position, as shown in FIG. 15, the cantilever 26b is elastically bent by the attraction force acting between the driving magnet 22a, and thus the cantilever The tip of the beam 26b is moved until it comes into contact with the side surface of the short side of the drive magnet 22a. In the present embodiment, the tip of the cantilever 26b is moved by about 0.5 mm by being attracted to contact the driving magnet 22a.

  The moving frame 14 is held in the locking position even after the driving force on the moving frame 14 is not applied due to the attractive force acting between the tip of the cantilever 26b and the driving magnet 22a. Further, in this state, the moving frame 14 is attracted to the locking position by the restoring force of the cantilever 26 b, and the engaging portion 17 is pressed against the engaging receiving portion 15. Since the magnetic force acting between the drive magnet 22a and the cantilever beam 26b is almost inversely proportional to the square of the distance between them, when the tip of the cantilever beam 26b and the drive magnet 22a come into contact with each other, The adsorptive force acting during the period increases rapidly. Therefore, the moving frame 14 is firmly held at the locking position, and the moving frame 14 can be prevented from being detached from the locking position even when an impact force is applied to the camera 1.

  Next, when the moving frame 14 is returned from the locking position to the operation center position, the locking position moving means 37 rotates the moving frame 14 in the clockwise direction in FIG. FIG. 16 shows a state where the moving frame 14 is slightly rotated clockwise from the locking position. As shown in FIG. 16, when the moving frame 14 is rotated clockwise, the engaging portion 17 provided on the moving frame 14 is separated from the engagement receiving portion 15. However, since the attraction force acting between the drive magnet 22a and the cantilever beam 26b is stronger than the force necessary to elastically deform the cantilever beam 26b, the tip of the cantilever beam 26b has a drive magnet. While adsorbed by 22a, it bends elastically. In this embodiment, the force required to elastically deform the cantilever 26b is set to be very small. For this reason, as described with reference to FIG. 8, the moving frame 14 can be moved toward the operation center position even in the region where the drive magnet 22 a is greatly deviated from the operation center position and the driving force is reduced. it can.

  As shown in FIG. 17, when the moving frame 14 is further rotated clockwise, the cantilever 26 b is further elastically deformed, and the intermediate portion of the cantilever 26 b comes into contact with the stopper 19. Thereby, elastic deformation of the cantilever 26b is prevented, and the amount of movement of the tip of the cantilever 26b is limited. By further rotating the moving frame 14 clockwise, as shown in FIG. 18, the cantilever 26b is pulled away from the driving magnet 22a.

  Here, at the position shown in FIG. 17, since the moving frame 14 is close to the operation center position, a relatively large driving force can be obtained. Therefore, the moving frame 14 is moved against the adsorption force between the cantilever 26b and the driving magnet 22a by the driving force acting between the driving magnet 22a and the driving coil 20a, and the cantilever is supported. 26b can be pulled away from the drive magnet 22a. In addition, the cantilever 26b is pulled away from the driving magnet 22a by the impact force with which the middle portion of the cantilever 26b comes into contact with the stopper 19 while the moving frame 14 returns to the operation center position.

  As shown in FIG. 18, when the cantilever beam 26b is separated from the driving magnet 22a, the attractive force acting between them is suddenly reduced. Return to the initial position shown in.

  According to the camera of the embodiment of the present invention, since the moving frame is held at the locking position by the suction of the driving magnet and the cantilever, the moving frame can be moved to the locking position with a small driving force. .

  Further, according to the camera of the present embodiment, since the drive magnet and the cantilever are attracted in contact with each other, the moving frame can be firmly held at the locking position, and the moving frame can be held by an impact or the like. It can prevent coming off from the locking position. In addition, during the image blur prevention control, the cantilever beam returns to the initial position and moves away from the driving magnet, so that the attractive force acting between the cantilever beam and the driving magnet does not adversely affect the control.

  Further, according to the camera of the present embodiment, since the amount of bending of the cantilever is limited by the stopper, even if the cantilever is configured flexibly, the attracted cantilever cannot be separated from the driving magnet. There is nothing. For this reason, it becomes possible to form a cantilever sufficiently flexibly.

  Furthermore, according to the camera of the present embodiment, since the engaging portion of the moving frame and the engaging portion receiving portion of the fixed frame abut at the locking position, the moving frame is rotated past the locking position. Since the engaging portion is attracted to the engaging portion receiving portion by the restoring force of the cantilever, the moving frame can be stably held at the locking position.

  Further, in the camera of the present embodiment, when the moving frame is returned from the locking position, the moving frame is first moved while the cantilever is attracted to the driving magnet so that the driving force of the linear motor is large. Once reached, the cantilever is pulled away from the drive magnet. Thus, the moving frame can be returned from the locking position with a small linear motor while the moving frame can be firmly held at the locking position.

  As mentioned above, although preferable embodiment of this invention was described, a various change can be added to embodiment mentioned above. In particular, in the above-described embodiment, the present invention is applied to a film camera. However, the present invention can be applied to any camera for capturing a still image or a moving image, such as a digital camera or a video camera. The present invention can also be applied to a lens unit used with the camera body of these cameras.

  In the above-described embodiment, the driving magnet functions as the locking fixed magnetic means, but the locking fixed magnetic means may be provided separately from the driving magnet. Further, in the above-described embodiment, the tip of the cantilever formed as a part of the adsorption yoke is caused to function as the moving magnetic means for locking, and the entire moving cantilever is elastically supported by the moving magnetic means for locking. However, as a modification, a moving magnetic means for locking is provided separately from the attraction yoke, and this is elastically supported by an elastic support means constituted by a coil spring, a leaf spring, etc. Also good. Further, either one of the locking fixed magnetic means and the locking moving magnetic means may be a magnet, or both may be magnets.

  Furthermore, in the above-described embodiment, the driving magnet, which is the locking magnetic means for locking, and the tip of the cantilever, which is the moving magnetic means for locking, are attracted and the magnetic bodies are in direct contact. The magnetic materials do not necessarily need to be in direct contact with each other, and any one or both of the magnetic materials such as the driving magnet and the tip of the cantilever are covered with any non-magnetic material. It can also be used as a means or a moving magnetic means for locking. Thus, by covering the magnetic material with the non-magnetic material, the attractive force acting between the magnetic means can be adjusted.

It is sectional drawing of the camera by embodiment of this invention. FIG. 6 is a front view of an actuator having a moving frame at an operation center position of image blur prevention control. It is a front view of an actuator in which a moving frame is in a locking position. It is side surface sectional drawing which follows the IV-IV line of FIG. (A) Side surface sectional drawing which follows the VV line | wire of FIG. 2, (b) It is a perspective view which shows the state of the magnetization of the magnet for a drive. (A) It is a perspective view which expands and shows the back yoke attachment part of a moving frame, (b) It is a perspective view which expands and shows the adsorption yoke attachment part of a fixed frame. It is a disassembled perspective view of the attachment part of a suction yoke and a back yoke. The graph (a) showing the relationship between the relative position of the driving coil and the driving magnet and the driving force received by the driving magnet, and the relative position of the driving coil and the driving magnet at points b to e in the graph (b) It is a figure which shows (e). It is a figure explaining the relationship between the movement of a drive magnet, and the signal output from a Hall element. It is a figure explaining the relationship between the movement of a drive magnet, and the signal output from a Hall element. It is a block diagram which shows the signal processing in a controller. It is a figure which shows the positional relationship of the drive coil arrange | positioned on the fixed frame, and the drive magnet arrange | positioned on the moving frame. It is a figure which shows the effect | action at the time of moving a moving frame to a latching position, or returning from a latching position. It is a figure which shows the effect | action at the time of moving a moving frame to a latching position, or returning from a latching position. It is a figure which shows the effect | action at the time of moving a moving frame to a latching position, or returning from a latching position. It is a figure which shows the effect | action at the time of moving a moving frame to a latching position, or returning from a latching position. It is a figure which shows the effect | action at the time of moving a moving frame to a latching position, or returning from a latching position. It is a figure which shows the effect | action at the time of moving a moving frame to a latching position, or returning from a latching position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camera of embodiment of this invention 2 Lens unit 4 Camera main body 6 Lens barrel 8 Imaging lens 10 Actuator 12 Fixed frame (fixed part)
12a Circuit board 12b Fixed frame body 12c Recess 12d Through hole 14 Moving frame (movable part)
14a Notch 15 Engagement receiving portion 15a Contact receiving surface 16 Image blur correcting lens 17 Engaging portion 17a Contact surface 18 Steel ball (movable portion supporting means)
19 Stopper 19a Notch 20a, 20b, 20c Driving coil 22a, 22b, 22c Driving magnet (fixing magnetic means for locking)
24a, 24b, 24c Hall element 26 Suction yoke 26a Rectangular portion 26b Cantilever (moving magnetic means for locking, elastic support means)
28 Back yoke 28a Rectangular portion 28b Leg 30 Adsorption magnet 34a, 34b Gyro 36 Controller 37 Locking position moving means 38a, 38b Arithmetic circuit 40a, 40b, 40c Arithmetic circuit 42a, 42b, 42c Magnetic sensor amplifier 44a, 44b, 44c Drive circuit 45 selector switch

Claims (10)

An actuator for translating the imaging lens in a plane perpendicular to its optical axis to prevent image blur;
A fixed part;
A movable part to which the imaging lens is attached;
A movable part support means for supporting the movable part so that the movable part can move on a plane parallel to the fixed part;
Drive means for translating and rotating the movable part relative to the fixed part;
A locking magnetic means for locking attached to one of the fixed part or the movable part;
Provided corresponding to the locking fixed magnetic means, and when the movable portion is rotated to a predetermined locking position, it is attracted to the locking fixed magnetic means and comes into contact with the locking fixed magnetic means. A moving magnetic means for locking,
An adsorption that is attached to the other of the fixed part or the movable part and acts between the locking fixed magnetic means and the locking moving magnetic means when the movable part is rotationally moved to the locking position. Elastic support means for elastically supporting the locking moving magnetic means so that the locking moving magnetic means is moved to a position in contact with the locking fixed magnetic means;
An actuator comprising:   The actuator according to claim 1, further comprising a stopper for limiting a moving amount of the locking moving magnetic means.   Further, an engaging portion provided in the movable portion, and provided in the fixed portion corresponding to the engaging portion, and abuts on the engaging portion when the movable portion is rotationally moved to the locking position. The actuator according to claim 1, further comprising an engaging portion receiving portion.   When the movable magnetic means for locking and the elastic supporting means are integrally formed by a cantilever beam formed of a magnetic material, and when the movable part is rotationally moved to the locking position, the cantilever beam is The actuator according to any one of claims 1 to 3, wherein the actuator is elastically bent and attracted to the locking fixed magnetic means.   The driving means includes a driving coil attached to one of the fixed part or the movable part, and a driving magnet attached to the other of the fixed part or the movable part corresponding to the driving coil. The actuator according to any one of claims 1 to 4, wherein the actuator is configured by a linear motor.   6. The actuator according to claim 5, wherein the driving magnet also functions as the locking fixed magnetic means.   Furthermore, it has the adsorption | suction yoke which adsorb | sucks the said fixed part and the said movable part with the magnetic force which the said drive magnet exerts, and a part of this adsorption | suction yoke functions as said latching moving magnetic means. The actuator described.   The attracting yoke is disposed on the opposite side of the drive magnet with respect to the drive coil, and one end of the attracting yoke extends beyond the drive coil toward the drive magnet. The actuator according to claim 7, wherein the actuator is formed as a cantilever and the cantilever is bent so that a tip of the cantilever is attracted to an end of the driving magnet. A lens barrel;
A plurality of imaging lenses housed in the lens barrel;
The actuator according to any one of claims 1 to 8, wherein a part of the imaging lens is attached to the movable part,
A lens unit comprising: The camera body,
The lens unit according to claim 9,
A camera characterized by comprising:

Images