JP2017090587A - Shake compensation device and optical apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shake compensation device capable of suppressing increase in size in a radial direction of an optical element to be greater than an increment of its movable amount even when the movable amount of the optical element is increased in the shake compensation device whose driving means is a VCM.SOLUTION: When a movable section 142 is located at a center of a movable range, a magnetization interface of opposing first to third magnets is disposed while being deviated by a prescribed deviation amount to a center of a first to a third coils, respectively. With a deviation direction of the deviation amount, viewed from a center O of an optical element, the magnetization interface of the first to third magnets held by the movable section 142 is all inside from the center of the first to the third coils held by a stationary section 143.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a shake correction apparatus and an optical apparatus that are provided in a lens barrel such as a digital camera and reduce shake of a subject image.

  In order to correct an image shake on the imaging surface via an optical element, there is a shake correction apparatus that reduces the image shake by moving the optical element in accordance with an externally applied shake. In order to correct a large shake with such a shake correction apparatus, it is required to move the optical element greatly. Patent Document 1 discloses a shake correction apparatus that reduces a decrease in drive efficiency without increasing the size of the drive apparatus when the optical element is moved greatly in a shake correction apparatus using a VCM as a drive unit.

Japanese Patent Laid-Open No. 2000-19577

  However, in the shake correction device of Patent Document 1, when the optical element is viewed from the optical axis direction before shake correction, the center of the coil and the center of the magnet are arranged so as to drive the position of the magnet center. The position of the optical element changes as the coil moves as the center. In this case, when viewed from the optical axis direction, the thrust in the moving direction becomes zero near the position where the magnetic flux density of the magnet is maximum at the center of the coil. Therefore, in order to increase the movable amount of the optical element, it is necessary to increase the width of the magnet and the width of the coil. However, when the width of the magnet or coil increases, there arises a problem that the size of the shake correction device increases in the radial direction of the optical element more than the increase in the movable amount.

  According to the present invention, in a shake correction apparatus using a VCM as a driving means, even when the movable amount of an optical element increases, an increase in the size of the optical element in the radial direction is suppressed more than the increase in the movable amount. An object of the present invention is to provide a shake correction device and an optical apparatus that can be used.

  The shake correction apparatus of the present invention includes an optical element, a fixed part, a movable part that holds the optical element and is movable with respect to the fixed part, and a support unit that supports the movable part with respect to the fixed part. Biasing means for biasing the support means so as to be sandwiched between the fixed portion and the movable portion, a substantially elliptical cylindrical coil held on one of the fixed portion or the movable portion, The magnet is disposed opposite to the coil and is held by the other of the fixed portion or the movable portion, and has a magnetized boundary surface parallel to the longitudinal direction of the coil, and the coil and the magnet constitute a pair. When there are three sets of driving means, and the longitudinal directions of the coils of the driving means are not parallel to each other, and the movable part is located at the center of the movable range, each of them faces the center of the coil The magnetization boundary of the magnet Are shifted by a predetermined shift amount, and the shift direction of the shift amount is, as viewed from the center of the optical element, the center of the coil held by the movable portion or the magnetization boundary surface of the magnet. It is characterized in that they are all inside or all outside the center of the coil held by the fixed part or the magnetization boundary surface of the magnet.

  According to the present invention, in a shake correction apparatus and an optical apparatus using a VCM as a driving unit, an increase in the size of the optical element in the radial direction can be suppressed even when the movable amount of the optical element is increased.

1 is a block diagram illustrating a circuit configuration of a shake correction apparatus according to a first embodiment of the present invention. It is a figure which shows the hardware constitutions of the shake correction apparatus of FIG. 1, (a) is a front view, (b) is sectional drawing. It is a figure which shows the positional relationship of the 1st-3rd magnet shown in FIG. 2 with respect to the 1st-3rd coil which comprises the correction | amendment part shown in FIG. 1, (a) is a front view, (b) is sectional drawing. It is. It is the front view seen from the optical axis Oa direction which shows the positional relationship of the support means and biasing means shown in FIG. It is sectional drawing explaining the force which generate | occur | produces with the drive means shown in FIG. 3A and 3B are front views for explaining the operation of the shake correction apparatus in FIG. 1, in which FIG. 2A is a diagram in which the movable part shown in FIG. 2 is located at the center of the movable range, and FIG. 3 shows a case where the distance from the magnetization boundary surface of the first magnet shown in FIG. 3 to the center of the first coil moves to P. FIG. It is a flowchart which shows the procedure of the control processing of the shake correction apparatus of FIG. FIG. 3A is a front view showing a movable range of the center O of the optical element shown in FIG. 2, and FIG. It is a figure which shows a possible range, (b) is the figure which expanded only the movable range of the center O of an optical element. It is a figure explaining the movable amount of an optical element, and the magnitude | size to the radial direction of the optical element 141 of an apparatus, (a) is sectional drawing when a movable part moves and contact | abuts to the control part shown in FIG. (B) is a cross-sectional view when the movable part of the conventional shake correction apparatus moves and contacts the restricting part. It is a figure which shows the hardware constitutions of the shake correction apparatus which concerns on the 2nd Embodiment of this invention, (a) is a front view, (b) is sectional drawing. It is a figure which shows the hardware constitutions of the shake correction apparatus which concerns on the 3rd Embodiment of this invention, (a) is a front view, (b) is sectional drawing. It is a figure which shows the hardware constitutions of the shake correction apparatus which concerns on the 4th Embodiment of this invention, (a) is a front view, (b) is sectional drawing. It is a figure which shows the hardware constitutions of the shake correction apparatus which concerns on the 5th Embodiment of this invention, (a) is a front view, (b) is sectional drawing. It is a figure which shows the hardware constitutions of the shake correction apparatus which concerns on the 6th Embodiment of this invention, (a) is a front view, (b) is sectional drawing.

  The best mode for carrying out the present invention will be described below with reference to the drawings. The following embodiments do not limit the invention according to the claims, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. Moreover, the shake correction apparatus according to the following embodiments can be mounted on an optical apparatus including an imaging apparatus such as a video camera, a digital camera, and a silver salt still camera, and an observation apparatus such as a binocular, a telescope, and a field scope. It can also be mounted on an optical device such as an interchangeable lens for a digital single lens reflex camera.

(First embodiment)
The shake correction apparatus 100 according to the first embodiment of the present invention will be described.

  FIG. 1 is a block diagram showing a circuit configuration of a shake correction apparatus 100 according to the first embodiment of the present invention.

  In FIG. 1, the shake correction apparatus 100 includes a comparison unit 110, a calculation unit 120, a drive unit 130, a correction unit 140, and a detection unit 150. The comparison unit 110 outputs a difference between a target position and a detection position of the movable unit 142 described later with reference to FIG. The calculation unit 120 is a ratio of currents to be supplied to each of three coils of the gain calculation unit 120g that calculates the gain based on the output of the comparison unit 110 and the correction unit 140 that will be described later based on the detection position of the movable unit 142. A function calculation unit 120f for calculating. The comparison unit 110 outputs the value of the current that flows through each of the three coils based on the calculation results of the gain calculation unit 120g and the function calculation unit 120f. The drive unit 130 includes first to third coil drive circuits, and controls current according to instructions from the calculation unit 120. The correction unit 140 includes three coils (first to third coils 151 to 153). In the correction unit 140, the current controlled by the drive unit 130 is supplied to the three coils, thereby moving three magnets (first to third magnets 161 to 163) described later to perform a shake correction operation. The detection unit 150 includes first to third detection units 171 to 173, and detects and outputs the position of the movable unit 142 that moves by energization of the first to third coils 151 to 153, respectively.

  Next, the configuration of the shake correction apparatus 100 will be described with reference to FIGS.

  2A and 2B are diagrams illustrating a hardware configuration of the shake correction apparatus 100 in FIG. 1, where FIG. 2A is a front view and FIG. 2B is a cross-sectional view. 3 is a diagram showing the positional relationship of the first to third magnets 161 to 163 shown in FIG. 2 with respect to the first to third coils 151 to 153 constituting the correction unit 140 shown in FIG. (A) is a front view, (b) is a sectional view.

  As shown in FIG. 2, the electric board unit 101 is a circuit board having circuits that perform processing of the comparison unit 110, the calculation unit 120, and the driving unit 130, and includes first to third coils 151 to 153 and wirings (not shown). The first to third detection units 171 to 173 are connected.

  The optical element 141 moves with respect to the optical axis Oa of the shake correction apparatus 100, and an image formed through the optical element 141 can be moved in an imaging plane (not shown). When an external shake such as a hand shake is detected, the shake correction apparatus 100 can reduce the shake of the image to be formed by moving the optical element 141 according to the shake.

  The movable portion 142 is a movable portion that holds the optical element 141, has a substantially cylindrical shape, and holds the optical element 141 at the center. Three planar ball receiving portions 142a perpendicular to the optical axis Oa are formed on the movable portion 142 on the side in contact with a rolling ball 144a described later. In this embodiment, three spring hanging portions 142b are formed on the outer periphery of the movable portion 142.

  The fixing portion 143 has a substantially cylindrical shape. Three planar ball receiving portions 143a perpendicular to the optical axis Oa are formed on the fixed portion 143 on the side in contact with a rolling ball 144a described later. Three spring hooks 143b are formed on the outer periphery of the fixed part 143 in this embodiment. The fixing portion 143 is formed with a restricting portion 143c. When the movable part 142 moves largely within the plane orthogonal to the optical axis Oa, the movable part 142 reaches the restricting part 143c, and the position of the movable part 142 is restricted. In addition, the position of the movable portion 142 when the position of the movable portion 142 is regulated by reaching the regulating portion 143c reaches the regulating portion 143c (not shown) provided on the opposite side and the position of the movable portion 142 is regulated. The position up to the position of the movable part 142 in the case of the movement is defined as the movable range of the movable part 142.

  The support means 144 is a support means for movably supporting the movable portion 142 with respect to the fixed portion 143, and includes a ball receiving portion 142a, a ball receiving portion 143a, and a rolling ball 144a. The rolling balls 144a are spheres made of ceramic or the like, and are arranged at three locations so as to contact the ball receiving portion 142a and the ball receiving portion 143a. When the rolling ball 144a rolls while being held between the ball receiving portions 142a and 143a, the movable portion 142 does not move in the optical axis Oa direction with respect to the fixed portion 143, and the optical axis Oa and It is possible to move in the orthogonal plane.

  The urging means 145 is an urging means that urges the support means 144 to be sandwiched between the fixed portion 143 and the movable portion 142, and includes a spring hook portion 142b, a spring hook portion 143b, and a tension spring 145a. The tension spring 145a is made of stainless steel or the like, and is configured to be hooked on each of the three pairs of spring hooks 142b and spring hooks 143b. When the movable portion 142 is moved by the tension spring 145a, a reaction force is generated in the direction opposite to the moving direction of the movable portion 142 so as to return to the center of the movable range. Therefore, when the movable part 142 moves greatly, the reaction force by the tension spring 145a increases according to the amount of movement. It should be noted that, instead of the tension spring 145a, one that generates an urging force in a direction in which the movable portion 142 and the fixed portion 143 come into contact with the support means 144, such as a magnetic force attracted between the movable portion 142 and the fixed portion 143. If so, other urging means may be used. Further, the materials of the rolling balls 144a and the tension springs 145a and the number of the tension springs 145a are not limited to the above-described form.

  As shown in FIG. 3, the first coil 151 is a substantially elliptic cylindrical coil held by the fixed portion 143, and is a wound coil made of a conductive wire wound elliptically when viewed from the optical axis Oa direction. It is. A surface 151a in the thickness direction of the first coil 151 is opposed to a first magnet 161 described later.

  The first magnet 161 is disposed to face the first coil 151, is held by the movable portion 142, and the normal direction of the surface 161a facing the first coil 151 is the magnetization direction, and the magnetization boundary surface 161b. Is a magnet parallel to the longitudinal direction of the first coil 151. The first magnet 161 has a first pole 161n and a second pole 161s having different magnetization directions divided by a magnetization boundary surface 161b, and the pole farther from the optical axis Oa is the first pole 161n, and the closer one is The pole is the second pole 161s. An outer peripheral portion of the first magnet 161 farthest from the optical element 141 is denoted by 161c.

  By supplying current to the first coil 151, Lorentz force is generated by the driving means 146 including the first coil 151 and the first magnet 161. This Lorentz force is generated in a direction passing through the optical axis Oa as indicated by an arrow 171f in a plane orthogonal to the optical axis Oa.

  The longitudinal direction of the first coil 151, the longitudinal direction of the second coil 152, and the longitudinal direction of the third coil 153 are not parallel to each other, and are arranged with an inclination of 120 ° with respect to the optical axis Oa. Since it becomes the same structure, other description is abbreviate | omitted. As described above, the shake correction apparatus 100 includes three sets of driving units 146, 147, and 148, that is, VCMs, each including a coil and a magnet.

  As shown in FIG. 2, the first to third magnets 161 to 163 are arranged so as to overlap with the optical element 141 in the optical axis Oa direction and as close as possible in the radial direction. This prevents an increase in the thickness of the shake correction apparatus 100 and suppresses an increase in the diameter of the shake correction apparatus 100. Further, the first to third coils 151 to 153 are positions where the movable portion 142 does not interfere within the movable range, and are disposed at positions close to the optical element 141 so that the radius of the shake correction apparatus 100 is as small as possible. ing.

  The features of the present invention will be described with reference to FIG. When the movable part 142 is positioned at the center of the movable range, the magnetization boundary surfaces 161b to 163b of the first to third magnets 161 to 163 with respect to the centers 151b to 153b of the first to third coils 151 to 153, respectively. Are shifted by a predetermined shift amount. In addition, the shift direction of the shift amount is such that the magnetization boundary surfaces 161b to 163b of the first to third magnets 161 to 163 are the same as those of the first to third coils 151 to 153 when viewed from the center O of the optical element 141. All are inside the centers 151b to 153b.

  The first detection unit 171 (see FIG. 2) is a Hall sensor that detects the position by magnetism, and is fixed to the fixing unit 143 via a holder or the like (not shown), and the position of the opposing first magnet 161 in the direction of the arrow 171f. The change is output as an electrical signal. The output signal is input to the electric board 101 (see FIG. 2). The second detection unit 172 and the third detection unit 173 (see FIG. 2) detect relative positions between the second magnet 162 and the third magnet 163, respectively, and the detection directions form an angle of 120 ° with each other. Yes.

  The arrangement of the support means 144 and the biasing means 145 will be described with reference to FIG.

  FIG. 4 is a front view showing the positional relationship between the support means 144 and the biasing means 145 shown in FIG. 2 as viewed from the optical axis Oa direction.

  A point farthest from the optical axis Oa in the support unit 144 is a point A, and a point farthest from the optical axis Oa in the biasing unit 145 is a point B. Further, a radius of a circle passing through the point A with the center point O of the optical element 141 as a center, a circle passing through the point B, and a circle in contact with the outer peripheral portions 161c to 163c farthest from the optical element 141 of the first to third magnets 161 to 163. Are Da, Db, and Dc, respectively. In this case, Da <Dc and Db <Dc are satisfied. Accordingly, when viewed from the direction of the optical axis Oa, the support means 144 and the biasing means 145 are more optical axes Oa than the outer peripheral portions of the first to third magnets 161 to 163 which are part of the drive means 146 to 148, respectively. Is located near. With this configuration, the radial direction size of the shake correction apparatus 100 is determined by the first to third magnets 161 to 163. As described above, since the first to third magnets 161 to 163 are arranged as close as possible to the optical element 141, the size in the radial direction of the optical element 141 of the shake correction apparatus 100 can be suppressed to be small. Will be.

  Next, the operation of the correction unit 140 will be described with reference to FIGS.

  FIG. 5 is a cross-sectional view for explaining the force generated by the driving means 146 shown in FIG.

  As described above, the rolling ball 144a rolls while being held between the ball receiving portions 142a and 143a, so that the movable portion 142 does not move in the direction of the optical axis Oa relative to the fixed portion 143. It moves in a plane orthogonal to the optical axis Oa. Therefore, since the first coil 151 and the first magnet 161 constituting the driving unit 146 are held by the movable portion 142 and the fixed portion 143, respectively, the first coil 151 and the first magnet 161 move relatively in a plane orthogonal to the optical axis Oa.

  FIG. 5 shows a state where the distance from the magnetization boundary surface 161b of the first magnet 161 to the center 151b of the first coil 151 is P. At this time, when a current is passed through the first coil 151 facing the first magnet 161, different Lorentz forces (F1a, F1b) are generated in the first pole 161n and the second pole 161s, respectively. Since the first magnet 161 is not moved in the direction of the optical axis Oa by the support means 144 and the biasing means 145 as described above, only the component in the plane perpendicular to the direction of the optical axis Oa works effectively. This contributes to the movement of the movable part 142. Therefore, when only in-plane components are extracted from the aforementioned Lorentz force (F1a, F1b), a force F1ah and a force F1bh are obtained.

  The distance P is determined according to the total length and width of the first magnet 161, the outer diameter of the first coil 151, the distance between the first magnet 161 and the first coil 151, and the like.

  Here, a state in which P is moved from the center 151b of the first coil in a direction approaching the optical axis Oa is shown, but the position where the force is balanced in the same manner even when moving away from the optical axis Oa is the distance P. Position.

  FIG. 6 is a front view for explaining the operation of the shake correction apparatus 100 of FIG. FIG. 6A shows a case where the movable part 142 shown in FIG. 2 is located at the center of the movable range. FIG. 6B shows the distance from the magnetization boundary surface 161b of the first magnet 161 shown in FIG. 3 to the center 151b of the first coil 151 in the direction of moving the movable portion 142 away from the optical axis Oa. Indicates the case of moving.

  6, the positions of the centers 151b to 153b of the first to third coils 151 to 153 and the magnetization boundary surfaces 161b to 163b of the first to third magnets 161 to 163 are extracted and shown.

  When the movable part 142 is positioned at the center of the movable range, as described above, the magnetization boundary surfaces of the first to third magnets 161 to 163 with respect to the centers 151b to 153b of the first to third coils 151 to 153, respectively. 161b to 163b are arranged so as to be shifted by P / 3. Thus, when only the first coil 151 among the first to third coils 151 to 153 is energized from the state in which the shift amount is P / 3, the movable portion 142 moves to the state shown in FIG. be able to. In FIG. 6B, the movable portion 142 is moved away from the optical axis Oa until the distance from the magnetization boundary surface 161b of the first magnet 161 to the center 151b of the first coil becomes P. In this state, as described above with reference to FIG. 5, when the first coil 151 is energized, the Lorentz force acting on the moving direction of the first magnet 161 is balanced, so that the first magnet 161 is further moved away from the optical axis Oa. I can't move.

  Here, the state of coils and magnets other than the first coil 151 and the first magnet 161 is confirmed. The distance from the magnetization boundary surface 162b of the second magnet 162 to the center 152b of the second coil 152 is P. The distance from the magnetization boundary surface 163b of the third magnet 163 to the center 153b of the third coil 153 is also P. That is, the Lorentz forces acting in the moving directions of the second magnet 162 and the third magnet 163 are balanced when the second coil 152 and the third coil 153 are energized. Therefore, the second magnet 162 and the third magnet 163 cannot be moved any more in the direction in which they approach the optical axis Oa.

  On the other hand, by energizing the second coil 152 to drive the second magnet 162 in a direction away from the optical axis Oa from the state where only the first coil 151 is energized in FIG. It is possible to move in the direction. Thereby, since the distance from the magnetization boundary surface 162b of the second magnet 162 to the center 152b of the second coil is smaller than P, a sufficient thrust can be ensured. Similarly, in order to drive the third magnet 163 in a direction away from the optical axis Oa from the state in which only the first coil in FIG. 6B is energized, the movable part 142 is set to D3 by energizing the third coil 153. It becomes possible to move in the direction.

  Although the case where the first coil 151 is first energized has been described here, the same movement is possible even if the other coils are initially energized, and thus detailed description thereof is omitted. As described above, by setting the deviation amount to P / 3 or less, it is possible to move in any direction until the deviation amount becomes P by movement in a plane orthogonal to the optical axis Oa.

  In the state where the movable portion 142 shown in FIG. 6A is located at the center of the movable range, as described above, the shift amount of the first to third magnets 161 to 163 with respect to the first to third coils 151 to 153 is P. / 3. On the other hand, after the movement shown in FIG. 6B, the shift amount is P in the opposite direction. Therefore, the movable amount, which is the difference between the deviation amounts, is 4P / 3. In the present embodiment, the arrangement of the restricting portion 143c is such that a movable amount 4P / 3 can be secured in all directions in which the movable portion 142 is movable.

  In the present embodiment, the amount of deviation is set to P / 3 when the movable portion 142 is located at the center of the movable range. This is intended to prevent the movable amount from being biased depending on the direction when the coils are arranged with an inclination of 120 °. However, when a large movement amount is set only in a specific direction, the deviation amount does not have to be P / 3.

  Next, a control method of the shake correction apparatus 100 will be described with reference to FIGS. 1, 7, and 8.

  FIG. 7 is a flowchart showing a procedure of control processing of the shake correction apparatus 100 of FIG. Specifically, FIG. 7 shows a control process from the start of the shake correction operation to the stop of the shake correction operation by the shake correction apparatus 100.

  FIG. 8 is a front view showing a movable range of the center O of the optical element 141 shown in FIG. FIG. 8A is a diagram showing the arrangement of the coils and magnets and the movable range of the center O of the optical element 141 when the movable part 142 is located at the center of the movable range, and FIG. FIG. 14 is an enlarged view of only the movable range of the center O of 141.

  In FIG. 7, in step S <b> 1, the target position of the movable unit 142 input from the outside is set in the comparison unit 110. In step S <b> 2, the detection unit 150 detects the position after the movable unit 142 is moved by the driving unit 130 and the correction unit 140, and outputs the detected position to the comparison unit 110. Thereby, the detection position is set in the comparison unit 110.

  In step S3, the comparison unit 110 compares the target position set in step S1 with the detection position set in step S2, and calculates the difference. Here, the coil to be energized according to the moving position of the movable portion 142 will be described.

  As shown in FIG. 8A, the movable range (movable amount) in which the center O of the optical element 141 can move is a circle with a radius of 4P / 3 centered on the optical axis Oa. Further, the triangle inscribed in this circle has a distance between one side and the optical axis Oa of 2P / 3. Further, as shown in FIG. 8B, in the region a1, since the shift amount P / 3 of the first coil 151 is set, the first coil 151 extends from the magnetization boundary surface 161b of the first magnet 161. This is a region where the distance to the center 151b exceeds P. For this reason, there is a possibility that sufficient thrust to the movable portion 142 may not be generated, so that the first coil 151 is not energized. Similarly, in the region a2, the second coil 152 is not energized, and in the region a3, the third coil 153 is not energized. In area | region a4, let it be an area | region which can energize all the 1st-3rd coils 151-153. In this manner, a coil that is not energized is set according to the position of the movable portion 142.

  Returning to FIG. 7, in step S4, the energization amount is calculated in consideration of the thrust generation direction of each coil based on the difference calculated in step S3. In step S5, the first to third coils 151 to 153 of the correction unit 140 are energized by the first to third coil drive circuits of the drive unit 130 based on the energization amount calculated in step S4. In step S6, Lorentz force is generated in the driving means 146, 147, and 148 in accordance with the current supplied to the first to third coils 151 to 153, and the movable portion 142 moves. In step S7, it is determined whether or not the operation is stopped. If not completed, the process returns to step S1, and the control is continued so that the difference between the target position and the detection position of the movable portion 142 disappears. In the present embodiment, a coil that is not energized is set according to the region shown in FIG. 8B, but thrust is not generated only when the amount of deviation is P, and the amount of deviation is larger than P. Appropriate energization is also possible for the coil. Detailed description is omitted.

  Next, the effect of the present invention will be described.

  FIG. 9 is a diagram illustrating the movable amount of the optical element 141 and the size of the optical element 141 in the radial direction of the apparatus. FIG. 9A is a cross-sectional view when the movable portion 142 moves and comes into contact with the restricting portion 143c shown in FIG. 2, and FIG. 9B shows the movement of the movable portion 102 of the conventional shake correction device. FIG. 6 is a cross-sectional view when abutting against the restricting portion 103c.

  In FIG. 9, only parts related to the operation in FIG. 2 are displayed, and other parts are omitted. Further, the coil 106 and the magnet 107 are assumed to have the same size as the first coil 151 and the first magnet 161, respectively.

  As described above with reference to FIG. 6, when the movable portion 142 is positioned at the center of the movable range, the magnetization boundary surface 161b of the first magnet 161 and the center 151b of the first coil 151 are P / 3 as viewed from the direction of the optical axis Oa. They are shifted. Therefore, as shown in FIG. 9A, when the movable portion 142 moves until it comes into contact with the restricting portion 143c, the distance St from the optical axis Oa to the center O of the optical element 141 is the movable amount of the movable portion 142. It becomes 4P / 3. The distance from the optical axis Oa at this time to the outer peripheral portion 161c of the first magnet 161 is represented by Da. Since the outer diameter of the shake correction apparatus 100 is determined depending on the distance Da, the smaller the Da is, the smaller the diameter of the shake correction apparatus 100 can be.

  On the other hand, in the configuration of the conventional shake correction device, when the movable portion 102 is located at the center of the movable range, the magnetization boundary surface 107b of the magnet 107 and the center 106b of the coil 106 coincide with each other when viewed from the optical axis Oa direction. It is set as follows. Therefore, when the coil 106 and the magnet 107 move until the movable portion 102 comes into contact with the restricting portion 103c, the distance from the optical axis Oa to the center O of the optical element 141 becomes P, which is the movable amount of the movable portion 102. In order for the movable part 102 to secure the same movable amount 4P / 3 (= St) as the movable part 142, it is necessary to increase the size of the coil 106 and the size of the magnet 107 as shown in FIG. 9B. . As a result, as shown in the drawing, the distance Da2 from the optical axis Oa to the outer peripheral portion 107c of the magnet 107 becomes larger than Da as is apparent from the comparison between FIGS. 9 (a) and 9 (b). That is, it can be seen that the diameter of the shake correction apparatus 100 of the present embodiment is smaller than the diameter of the conventional shake correction apparatus. Thus, the shake correction apparatus 100 of the present embodiment can be made smaller in the radial direction than the conventional shake correction apparatus.

  As described above, according to the present invention, in the shake correction apparatus using the VCM as a driving unit, even when the movable amount of the optical element is increased by the movable portion, the diameter of the optical element exceeds the increase in the movable amount. It can suppress that the magnitude | size to a direction increases.

(Second Embodiment)
A shake correction apparatus 200 according to the second embodiment of the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. Only parts different from those of the first embodiment will be described.

  FIG. 10 is a diagram illustrating a hardware configuration of a shake correction apparatus 200 according to the second embodiment of the present invention, where (a) is a front view and (b) is a cross-sectional view.

  The first coil 251 is held by the movable portion 242, and the first magnet 261 is disposed to face the first coil 251 and is held by the fixed portion 243. The longitudinal direction of the second coil 252 and the longitudinal direction of the third coil 253 are the first except that they are arranged with an inclination of 120 ° with respect to the longitudinal direction of the first coil 251 when viewed from the optical axis Oa. Since it becomes the structure similar to embodiment, other description is abbreviate | omitted. As described above, the shake correction apparatus 200 includes three sets of driving means 246, 247, and 248, that is, a VCM, each including a coil and a magnet.

  The first detection unit 271 is fixed to the movable unit 242 via a holder (not shown) in a space where the fixed unit 243 is cut out, and outputs a change in the position of the opposing first magnet 261 as an electrical signal.

  When the movable part 242 is positioned at the center of the movable range, the magnetization boundary surfaces 261b to 263b of the first to third magnets 261 to 263 are respectively in relation to the centers 251b to 253b of the first to third coils 251 to 253. They are shifted by a predetermined shift amount. In addition, the shift direction of the shift amount is such that the magnetization boundary surfaces 261 b to 263 b of the first to third magnets 261 to 263 are the positions of the first to third coils 251 to 253 as viewed from the center O of the optical element 241. All are inside the centers 251b to 253b.

  As described above, the parts that hold the first to third coils 251 to 253 and the first to third magnets 261 to 263 are switched, and the first to third detection units 271 to 273 are arranged on the movable unit 242. This is a difference from the first embodiment. That is, if the first to third coils 251 to 253 are held on one of the fixed part or the movable part and the first to third magnets 261 to 263 are held on the other of the fixed part or the movable part, the first implementation is performed. It is not limited to the configuration of the form.

  By holding the coil with the movable portion 242 as described above, wiring to the movable portion 242 is required, but the movable portion 242 can be further reduced in weight as compared with the case where the magnet is held.

  As described in the first embodiment, the arrangement of the first to third coils 251 to 253 and the first to third magnets 261 to 263 are exchanged for the control of the energization amount to each coil and the setting of the predetermined deviation amount. Since it is the same as that of 1st Embodiment, description is abbreviate | omitted.

  Since the control method of the shake correction apparatus 200 is the same as the method described in FIG. 7 in the first embodiment, the description thereof is omitted.

  With the above-described configuration, in the shake correction apparatus using the VCM as the driving unit, even when the movable amount of the optical element is increased, the optical element is moved in the radial direction more than the increased movable amount. An increase in size can be suppressed. In addition, the movable part 242 can be further reduced in weight as compared with the first embodiment.

(Third embodiment)
A shake correction apparatus 300 according to the third embodiment of the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. Only parts different from those of the first embodiment will be described.

  FIG. 11 is a diagram illustrating a hardware configuration of a shake correction apparatus 300 according to the third embodiment of the present invention, where (a) is a front view and (b) is a cross-sectional view.

  The first coil 351 is held by the fixed portion 343, and the first magnet 361 is disposed to face the first coil 351 and is held by the movable portion 342. The longitudinal direction of the second coil 352 and the longitudinal direction of the third coil 353 are the first except that they are arranged with an inclination of 120 ° with respect to the longitudinal direction of the first coil 351 when viewed from the optical axis Oa. Since it becomes the structure similar to embodiment, other description is abbreviate | omitted. As described above, the shake correction apparatus 300 includes three sets of driving units 346, 347, and 348, that is, a VCM, each including a coil and a magnet.

  When the movable part 342 is positioned at the center of the movable range, the magnetization boundary surfaces 361b to 363b of the first to third magnets 361 to 363 with respect to the centers 351b to 353b of the first to third coils 351 to 353, respectively. Are shifted by a predetermined shift amount. The shift direction of the shift amount is such that the magnetization boundary surfaces 361 b to 363 b of the first to third magnets 361 to 363 are the first to third coils 351, 352, 353 when viewed from the center O of the optical element 341. All of the centers 351b to 353b are outside.

  As described above, the difference from the first embodiment is that the magnetization boundary surface of the magnet is entirely outside the center of the coil.

  Since the control of the energization amount to each coil and the setting of the predetermined deviation amount described in FIGS. 3 to 6 and 8 in the first embodiment are the same as those in the first embodiment, the description is omitted. To do.

  Since the control method of the shake correction apparatus 300 is the same as the method described in FIG. 7 in the first embodiment, the description thereof is omitted.

  In addition, the present embodiment is a moving magnet system in which a magnet is held by the movable portion 342. However, similarly to the second embodiment, a coil is held by the movable portion 342 and a magnet is held by the fixed portion 343. A moving coil system may be used. In this case, the hardware configuration is the same as the shake correction apparatus 400 shown in FIG. 12 (fourth embodiment).

  With the above-described configuration, in the shake correction apparatus using the VCM as the driving unit, even when the movable amount of the optical element is increased, the optical element is moved in the radial direction more than the increased movable amount. An increase in size can be suppressed.

  Furthermore, in the third embodiment, when the outer shape of the optical element 341 in the vicinity of the fixed portion 343 is small, the first to third coils 351 to 353 can be moved inward, so that the outer peripheral portion of the shake correction apparatus 300 Other parts can be placed in In the fourth embodiment, the first to third magnets 461 to 463 can be moved inward when the outer shape of the optical element 441 near the fixed portion 443 is small. The diameter can be reduced.

(Fifth embodiment)
A shake correction apparatus 500 according to the fifth embodiment of the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. Only parts different from those of the first embodiment will be described.

  FIG. 13 is a diagram illustrating a hardware configuration of a shake correction apparatus 500 according to the fifth embodiment of the present invention, where (a) is a front view and (b) is a cross-sectional view.

The first coil 551 is held by the fixed portion 543, and the first magnet 561 is disposed to face the first coil 551 and is held by the movable portion 542. The longitudinal directions of the second and third coils 552 and 553 are 90 ° (= θ ₂ ) and 135 ° (= θ ₁ ≧ θ, respectively) when viewed from the optical axis Oa with respect to the longitudinal direction of the first coil 551. ₂ ) It is arranged with an inclination. Except for this arrangement, the present embodiment has the same configuration as that of the first embodiment, and thus other descriptions are omitted. As described above, the shake correction apparatus 500 includes three sets of drive units 546, 547, and 548, that is, a VCM, each including a coil and a magnet.

  When the movable portion 542 is positioned at the center of the movable range, the magnetization boundary surfaces 561b to 563b of the first to third magnets 561 to 563 with respect to the centers 551b to 553b of the first to third coils 551 to 553, respectively. Are shifted by a predetermined shift amount. In addition, the shift direction of the shift amount is such that the magnetization boundary surfaces 561b to 563b of the first to third magnets 561 to 563 correspond to the respective first to third coils 551 to 553 as viewed from the center O of the optical element 541. All are inside the centers 551b to 553b.

  As described above, the difference from the first embodiment is that the angle at which the longitudinal direction of each coil is inclined is different. In the first embodiment, each coil is arranged with an inclination of 120 °, and the amount of deviation between the coil and the magnet is set to P / 3, so that the movable amount 142 is movable in all directions. / 3 was secured. On the other hand, in this embodiment, F is the amount of deviation between the coil and the magnet. As a result, a movable amount P + F is secured in all directions in which the movable portion 542 is movable. F is set within a range satisfying the following expression.

F ≦ P × (1 + cos θ ₁ ) / (1−cos θ ₁ )
That is, in the present embodiment, the maximum inclination θ ₁ among the inclinations of the coils is set to 135 ° (that is, θ ₁ ≧ (180−θ ₂ ) / 2). It turns out that it will be 17P. By setting F in this way, the movable portion 542 has a movable amount of P + F in all the movable directions. In the case of the first embodiment or the like (that is, θ = θ ₁ = θ ₂ = 120 °), this relational expression also holds.

  Since the control method of the shake correction apparatus 500 is the same as the method described in FIG. 7 in the first embodiment, the description thereof is omitted.

  In addition, the present embodiment is a moving magnet system in which a magnet is held by the movable portion 542. However, similarly to the second embodiment, a coil is held by the movable portion 542 and a magnet is held by the fixed portion 543. A moving coil system may be used. Further, when the movable part 542 is located at the center of the movable range, the magnetization boundary surfaces of the magnets held by the movable part 542 are all disposed inside the centers of the coils held by the fixed part. . All of these may be arranged outside.

  With the above-described configuration, in the shake correction apparatus using the VCM as the driving unit, even when the movable amount of the optical element is increased, the optical element is moved in the radial direction more than the increased movable amount. An increase in size can be suppressed. Further, unlike the first embodiment, θ can be set to an angle other than 120 ° as in the present embodiment, so that the degree of freedom of the layout of the components constituting the shake correction apparatus 500 can be increased. .

(Sixth embodiment)
A shake correction apparatus 600 according to the sixth embodiment of the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted. Only parts different from those of the first embodiment will be described.

  FIG. 14 is a diagram showing a hardware configuration of a shake correction apparatus 600 according to the sixth embodiment of the present invention, where (a) is a front view and (b) is a cross-sectional view.

  The ball receiving portions 642a and 643a have a mortar shape, and the rolling ball 644a rolls on the mortar surface. When the movable part 642 is located at the center of the movable range, the first to third coils 651 to 653 are all inclined by a predetermined angle with respect to the plane orthogonal to the optical axis Oa. Similarly, the first to third magnets 661 to 663 and the first to third detection units 671 to 673 are all relative to the plane orthogonal to the optical axis Oa when the movable unit 642 is located at the center of the movable range. It is in a state inclined by a predetermined angle. Due to the magnet and coil that are tilted in this way, thrust is generated so that the movable portion 642 moves on a spherical surface centered on the point Q.

  As described above, the difference from the first embodiment is that the shape of the ball receiving portion, the coils, the magnets, and the detecting portion are inclined and the movable portion moves on the spherical surface.

  As described above, the shake correction apparatus 600 includes three sets of driving units 646 to 648 each including a coil and a magnet. When the movable part 642 is positioned at the center of the movable range, the magnetization boundary surfaces 661b to 663b of the first to third magnets 661 to 663 are respectively relative to the centers 651b to 653b of the first to third coils 651 to 653. Are shifted by a predetermined shift amount. In addition, the shift direction of the shift amount is such that the centers 651b to 653b of the first to third coils 651 to 653 are the magnetization boundaries of the first to third magnets 661 to 663 when viewed from the center O of the optical element 641. All of the surfaces 661b to 663b are outside.

  The control method of the shake correction apparatus 600 is the same as the method described in the first embodiment with reference to FIG.

  In addition, the present embodiment is a moving magnet system in which a magnet is held by the movable portion 642. However, similarly to the second embodiment, a coil is held by the movable portion 642 and a magnet is held by the fixed portion 643. A moving coil system may be used. Further, when the movable part 642 is positioned at the center of the movable range, the magnetization boundary surfaces of the magnets held by the movable part 642 are all disposed inside the centers of the coils held by the fixed part. . All of these may be arranged outside.

DESCRIPTION OF SYMBOLS 100 Shake correction apparatus 141 Optical element 142 Movable part 143 Fixed part 144 Support means 145 Energizing means 146-148 Drive means 151 1st coil 151b Center of 1st coil 161 1st magnet 161b Magnetization boundary surface 152 of 1st magnet Two coils 152b Center of second coil 162 Second magnet 162b Magnetization boundary surface of second magnet 153 Third coil 153b Center of third coil 163 Third magnet 163b Magnetization boundary surface of third magnet O Center of optical element Oa optical axis

Claims (7)

An optical element;
A fixed part;
A movable part that holds the optical element and is movable relative to the fixed part;
Support means for supporting the movable part with respect to the fixed part;
Biasing means for biasing the support means so as to be held by the fixed portion and the movable portion;
A substantially elliptical cylindrical coil held on one of the fixed part or the movable part;
The magnet is disposed opposite to the coil, held on the other of the fixed part or the movable part, and has a magnetized boundary surface parallel to the longitudinal direction of the coil,
Having three sets of driving means including one set of the coil and the magnet;
The longitudinal directions of the coils of the driving means are not parallel to each other,
When the movable part is located at the center of the movable range, the magnetized boundary surfaces of the magnets facing each other with respect to the center of the coil are arranged to be shifted by a predetermined shift amount,
Further, the shift direction of the shift amount is the center of the coil held by the movable part or the center of the coil held by the fixed part when viewed from the center of the optical element. Alternatively, the shake correction apparatus is characterized in that it is all inside or all outside the magnetizing boundary surface of the magnet. The longitudinal direction of the remaining one coil is arranged with an inclination of θ ₁ with respect to the longitudinal direction of one of the three sets of driving means, and the longitudinal direction of the other coil is equal to or less than the inclination of θ _1. When the θ ₂ is arranged with an inclination of θ ₂ and θ ₁ is (180−θ ₂ ) / 2 or more, the magnet of the driving means has a first pole and a second pole with different magnetization directions, When the coil paired with the magnet is energized, a force in a direction orthogonal to the magnetization boundary surface generated by the first pole and a direction orthogonal to the magnetization boundary surface generated by the second pole When the distance from the magnetization boundary surface of the magnet when the force is balanced to the center of the coil is P, and the predetermined deviation amount is F,
F ≦ P × (1 + cos θ ₁ ) / (1−cos θ ₁ )
The shake correction apparatus according to claim 1, wherein:   The value of P is determined according to the total length and width of the magnet of the driving means, the outer diameter of the coil paired with the magnet, and the distance between the paired magnet and coil. Item 3. The shake correction device according to Item 2. 4. The shake correction apparatus according to claim 2, wherein the values of [theta] ₁ and [theta] ₂ are 120 [deg.], And the deviation amount is P / 3 or less. The support means includes a first ball receiving portion provided in the movable portion, a second ball receiving portion provided in the fixed portion, and a sphere contacting the first and second ball receiving portions. Consisting of three sets
The three sets of driving means are all held at a predetermined angle with respect to a plane orthogonal to the optical axis Oa when the movable portion is located at the center of the movable range.
The shake correction apparatus according to claim 4, wherein the first and second ball receiving portions have a mortar shape.   When viewed from the direction of the optical axis, the support means and the urging means are configured such that, when the movable part is located at the center of the movable range, the optical axis of the driving means is farther from the outermost part than the optical element. The shake correction apparatus according to claim 1, wherein the shake correction apparatus is disposed on an inner side including   An optical apparatus comprising the shake correction device according to claim 1.

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