JP2008225158A

JP2008225158A - Stage device and camera shake correcting device using the stage device

Info

Publication number: JP2008225158A
Application number: JP2007064639A
Authority: JP
Inventors: Shuzo Seo; 修三瀬尾
Original assignee: Hoya Corp; Ｈｏｙａ株式会社
Priority date: 2007-03-14
Filing date: 2007-03-14
Publication date: 2008-09-25
Anticipated expiration: 2027-03-14
Also published as: JP5084308B2

Abstract

PROBLEM TO BE SOLVED: To provide a stage device capable of achieving camera shake correcting operation by low power, despite a type that the camera-shake correcting operation is performed by using an electromagnet, and to provide a camera-shake correcting device. SOLUTION: The stage device is equipped with four electromagnets 31A, 31B, 31C and 31D fixed onto a fixed support substrate 21; four permanent magnets 42A, 42B, 42C and 42D fixed to a stage member 40 capable of sliding relative to the fixed support substrate, facing the respective electromagnets and generating attractive force or repulsive force between the opposed electromagnets; and power supply means B and C supplying power to the electromagnets. COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a stage device and a camera shake correction device for a camera using the stage device.

In the video camera of Patent Document 1, a part of a lens group is a correction lens (lens group 103), and the correction lens 103 can move on a plane orthogonal to the optical axis. A plurality of electromagnets 105 are attached to the inner peripheral surface of the lens barrel 104 that houses the correction lens 103, and a fixed iron core 106 that faces each electromagnet 105 is fixed to the outer peripheral portion of the correction lens 103.

In this video camera, a current is passed through the coil of the electromagnet 105 to generate a magnetic force in the electromagnet 105, thereby separating the correction lens 103 from the inner peripheral surface of the lens barrel 104 (raising).
Then, when a camera shake occurs in the video camera with the correction lens 103 separated from the inner peripheral surface of the lens barrel 104 (in a lifted state) as described above, a current is passed through the coil of the electromagnet 105 and the magnetic force is applied to the electromagnet 105. And the distance between the fixed iron cores 106 facing each electromagnet 105 is changed using this magnetic force. Then, since the position of the correction lens 103 on the plane changes, the camera shake generated in the video camera is canceled.
Japanese Patent Laid-Open No. 9-43663

In the video camera of Patent Document 1, since the correction lens 103 is driven using the electromagnet 105 and the fixed iron core 106, a large current must be passed through the coil of the electromagnet 105 in order to perform the hand shake correction operation. Don't be. In addition, in order to separate the correction lens 103 from the inner peripheral surface of the lens barrel 104, it is necessary to pass a current through the coil of the electromagnet 105, so it is difficult to save energy.

An object of the present invention is to provide a stage device and a camera shake correction device for a camera that are capable of realizing a camera shake correction operation with a small amount of power while being a type that performs an image stabilization operation using an electromagnet.

The stage device of the present invention includes a pair of first X magnets arranged in a specific X direction fixed to a fixed support substrate, a stage member that can move relative to the fixed support substrate on a specific reference plane, and A pair of X-use magnets that generate an attraction force or a repulsive force in the X-direction between the pair of first X-use magnets fixed to the stage member and facing each other in the X-direction. One of the first X magnet and the second X magnet facing each other is a permanent magnet and the other is an electromagnet.

It is preferable that both the first X magnet and the second X magnet are located on a specific plane parallel to the reference plane.

A support member for movably supporting the stage member is provided on the opposite side of the fixed support substrate across the stage member, and the second X magnet is positioned closer to the support member than the first X magnet. Is preferred.

Further, the first magnet for X is provided with a pair of magnetic field generators that are parallel to the reference plane and separated from each other in the Y direction perpendicular to the X direction, and the second magnet for X and the magnetic field generator It is preferable to provide a pair of magnetic field generators that face each other and are separated from each other in the Y direction.
In this case, the first magnet for X and the second magnet for X are provided with a pair of the magnetic force generators made of a magnetic material that are continuous with the N and S poles of the permanent magnet, respectively. Is preferred.
Furthermore, a plane that is flush with the permanent magnet and the magnetic body may be formed, and a connecting plate made of PET may be bonded to the planes of the permanent magnet and the magnetic body.

Furthermore, it is preferable to form the magnetic field generator at both ends in the Y direction of at least one of the first X magnet and the second X magnet.
Further, it is preferable that the Y direction dimension of one of the magnetic field generating portions of the first X magnet and the second X magnet is larger than the other magnetic field generating portion.

It is preferable that the thickness of the second magnet for X is equal to or less than the stage member, and that both front and back surfaces of the second magnet for X are not projected from both front and back surfaces of the stage member and fall within the thickness of the stage member.

The electromagnet constituting one of the first X magnet and the second X magnet can be embodied by, for example, a structure in which a coil is wound around a core made of a magnetic material.

Furthermore, a pair of first Y magnets arranged in the Y direction orthogonal to the X direction fixed to the fixed support substrate, the two first Y magnets fixed to the stage member, and the Y direction, respectively. A pair of second Y magnets that generate an attractive force or a repulsive force in the Y direction between the first Y magnet and the first Y magnet, and the first Y magnet and the Y facing each other. It is preferable that one of the second magnets is a permanent magnet and the other is an electromagnet.

It is preferable that the first Y magnet and the second Y magnet are both located on a specific plane parallel to the reference plane.

A support member for movably supporting the stage member is provided on the opposite side of the fixed support substrate across the stage member, and the second Y magnet is positioned closer to the support member than the first Y magnet. Is preferred.

Furthermore, the Y first magnet is provided with a pair of magnetic field generators parallel to the reference plane and spaced apart from each other in the X direction, and the Y second magnets are opposed to the magnetic field generators, respectively. It is preferable to provide a pair of magnetic field generators spaced apart in the direction.
In this case, the first magnet for Y and the second magnet for Y are provided with a pair of the magnetic force generators that are continuous with the north and south poles of the permanent magnet and are made of a magnetic material. Is preferred.
Furthermore, a plane that is flush with the permanent magnet and the magnetic body may be formed, and a connecting plate made of PET may be bonded to the planes of the permanent magnet and the magnetic body.

Furthermore, it is preferable to form the magnetic field generator at both ends in the X direction of at least one of the first Y magnet and the second Y magnet.
Further, it is preferable that the X direction dimension of one of the magnetic field generating portions of the first Y magnet and the second Y magnet is larger than the other magnetic field generating portion.

Furthermore, it is preferable that the thickness of the second magnet for Y is equal to or less than that of the stage member, and the front and back surfaces of the second magnet for Y are not protruded from the front and back surfaces of the stage member and fall within the thickness of the stage member. .

The electromagnet that constitutes one of the first Y magnet and the second Y magnet can be realized by a structure in which a coil is wound around a core made of a magnetic material.

When the first magnet for X and the second magnet for X as well as the first magnet for Y and the second magnet for Y are provided, the stage device built in the camera and the imaging fixed to the front surface of the stage member An element, a vibration detection sensor for detecting vibrations in the X direction and Y direction of the camera, and power supply means for supplying power to the electromagnet. The power supply means is detected by the vibration detection sensor. Based on the vibration information, the electromagnet of the first X magnet and the second X magnet, and the first Y magnet and the second Y magnet so as to cancel the camera shake generated in the camera. A camera shake correction device can be obtained by passing a current through one of the electromagnets.

Further, the camera shake correction device includes the stage device built in the camera, a correction lens fixed to the stage member, a vibration detection sensor for detecting vibrations in the X direction and Y direction of the camera, and the electromagnet. Power supply means for supplying power to the first magnet for X and X so that the power supply means cancels camera shake generated in the camera based on vibration information detected by the vibration detection sensor. It can also be obtained by passing an electric current through the electromagnet of the second magnet for use and the electromagnet of the first magnet for Y and the second magnet for Y.

According to the stage apparatus of the present invention, the first magnet for X (and the first magnet for Y) fixed to the fixed support substrate and the second magnet for X (and the second magnet for Y) fixed to the stage member are generated. Since the stage member is moved in the X direction and the Y direction with respect to the fixed support substrate using magnetic force, the stage member can be driven with less electric power than in the conventional technique using an electromagnet and an iron core.
Furthermore, if the core material of the electromagnet is a permanent magnet, the stage member can be held at a specific position without passing an electric current through the electromagnet, so that further energy saving can be achieved.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the following description, as indicated by arrows in FIGS. 1 and 2, the left and right direction of the camera shake correction device 20 of the camera digital camera 10 is defined as the X direction, the up and down direction is defined as the Y direction, and the front and rear direction is defined as the Z direction.
First, the basic structure of the camera digital camera 10 and the camera shake correction device 20 will be described.
As shown in FIG. 1, an optical system composed of a plurality of lenses L1, L2, and L3 is disposed in a lens barrel 11 of a digital camera 10 (camera) (reference O is an optical axis of the camera). A camera shake correction device 20 located immediately after the lens L3 is disposed in the camera body 12.

The camera shake correction device 20 has a structure shown in FIGS.
As shown in FIGS. 2 to 4, the camera shake correction device 20 includes a front fixed support substrate (fixed support substrate) 21 that is rectangular in front view, and a rear fixed support substrate 22 that has the same front shape as the front fixed support substrate 21. And. Four corresponding positions on the rear surface of the front fixed support substrate 21 and the front surface of the rear fixed support substrate 22 are connected to each other by a connection column 23, and the front fixed support substrate 21 and the rear fixed support substrate 22 are parallel to each other. Yes. Then, the rear fixed support substrate 22 is fixed to the inner surface of the camera body 12 with three fixing screws not shown.

A window hole 24 having a substantially square shape when viewed from the front is formed at the center of the front fixed support substrate 21. A rear end portion of a support frame 25, which is a frontal rectangular frame, is fitted and fixed to the window hole 24, and an infrared cut filter 26 is fitted and fixed to the front end opening of the support frame 25. Support protrusions 28 protrude from four locations on the rear surface of the front fixed support substrate 21. A hemispherical recess (not shown) is provided on the rear surface of each support protrusion 28, and a front half of a metal ball 29 is rotatably fitted in each recess.
Further, four pedestals 30 are fixed to the rear surface of the front fixed support substrate 21 along the four sides of the front fixed support substrate 21, and electromagnets 31 A (first Y magnets) are mounted on the rear surface of each pedestal 30. ), An electromagnet 31B (first magnet for X), an electromagnet 31C (first magnet for Y), and an electromagnet 31D (first magnet for X) are fixed.

The electromagnet 31A, the electromagnet 31B, the electromagnet 31C, and the electromagnet 31D all have a substantially rectangular iron core 32A, iron core 32B, iron core 32C, and iron core 32D (the iron core 32A and the iron core 32C have the same specifications. The core 32B and the iron core 32D have the same specifications), and the conductive core 33A, the coil 33B, and the coil 33C wound several hundred times around the center of the iron core 32A, the iron core 32B, the iron core 32C, and the iron core 32D. And the coil 33D (the winding direction and the winding number of the coil 33A and the coil 33C are the same, and the winding direction and the winding number of the coil 33B and the coil 33D are the same). The front surface of each coil 33A, coil 33B, coil 33C, and coil 33D is fixed to the rear end surface of the corresponding pedestal 30, and the iron core 32A, iron core 32B, iron core 32C, and iron core 32D are all front fixed support substrates. 21 and the rear fixed support substrate 22 are located on a specific plane.
The iron core 32A and the iron core 32C extend in a direction parallel to the X direction, and the iron core 32B and the iron core 32D extend in a direction parallel to the Y direction. Projections projecting downward from both ends of the iron core 32A constitute an S pole (magnetic field generating section) and an N pole (magnetic field generating section) when a current flows through the coil 33A. Similarly, the protrusions projecting leftward from both ends of the iron core 32B constitute an S pole (magnetic field generating section) and an N pole (magnetic field generating section) when a current flows through the coil 33B, respectively. Projections projecting upward from both ends of the core 32C constitute an S pole (magnetic field generating section) and an N pole (magnetic field generating section) when current flows through the coil 33C, respectively, and both ends of the iron core 32D. Projections projecting from the right to the right constitute an S pole (magnetic field generating section) and an N pole (magnetic field generating section) when a current flows through the coil 33D.

A support protrusion 35 protrudes forward at a position corresponding to each support protrusion 28 on the front surface of the rear fixed support substrate 22, and a hemispherical recess (not shown) provided in each support protrusion 35. The latter half of the metal ball 36 is rotatably fitted.
Further, a permanent magnet 37 is fixed to the center of the front surface of the rear fixed support substrate 22.

Between the front fixed support substrate 21 and the rear fixed support substrate 22, a stage plate 40 (stage member) that is parallel to the front fixed support substrate 21 and the rear fixed support substrate 22 and has a substantially square shape in front view is located. Balls 29 are rotatably in contact with the four positions on the front surface of the stage plate 40, and balls 36 are rotatably contacted with the four positions on the rear surface of the stage plate 40. That is, the stage plate 40 is sandwiched from the front and rear by the four balls 29 and the four balls 36. Therefore, the stage plate 40 can move not only in a straight line in the X direction and the Y direction on a specific reference plane parallel to the front fixed support substrate 21 and the rear fixed support substrate 22 but also on the reference plane.
A cutout 41A, a cutout 41B, a cutout 41C, and a cutout 41D are recessed in each side edge of the stage plate 40 (the cutout 41A and the cutout 41C have the same shape, and the cutout 41B and the cutout 41D have the same shape). ).
The cutout 41A is fitted and fixed with a magnet unit in which a pair of left and right iron members 43A are fixed to the end faces of the north and south poles of the permanent magnet 42A (second magnet for Y). The left and right iron members 43A have the same specifications, and the protrusion protruding upward from the right iron member 43A constitutes the S pole opposite to the N pole of the iron core 32A, and the protrusion protruding upward from the left iron member 43A is iron. The N pole opposite to the S pole of the core 32A is configured. Similarly, a magnet unit in which an iron material 43C having the same specification as that of the iron material 43A is fixed to the end surfaces of the N pole and the S pole of the permanent magnet 42C (second magnet for Y) having the same specification as the permanent magnet 42A is fitted in the notch 41C. The protrusion protruding downward from the right iron material 43C constitutes the S pole opposite to the N pole of the iron core 32C, and the protrusion protruding downward from the left iron material 43C is the iron core 32C. The N pole opposite to the S pole is formed.
The cutout 41B is fitted and fixed with a magnet unit in which a pair of upper and lower iron members 43B are fixed to the N pole and S pole end surfaces of the permanent magnet 42B (second magnet for X) having the same specifications as the permanent magnet 42A. The upper and lower iron members 43B have the same specifications, and the protrusion protruding rightward from the upper iron member 43B constitutes the N pole opposite to the S pole of the iron core 32B, and the protrusion protruding rightward from the lower iron member 43B is The S pole opposite to the N pole of the iron core 32B is configured. Similarly, a magnet unit in which an iron material 43D having the same specification as that of the iron material 43B is fixed to the end surfaces of the N pole and the S pole of the permanent magnet 42D (second magnet for X) having the same specification as the permanent magnet 42B is fitted in the notch 41D. The protrusion that is fixed and protrudes to the left from the upper iron material 43D forms an N pole that faces the south pole of the iron core 32D, and the protrusion that protrudes to the left from the lower iron material 43D is the N of the iron core 32D. An S pole opposite to the pole is formed.
The plate thickness in the Z direction of the permanent magnet 42A, permanent magnet 42B, permanent magnet 42C, permanent magnet 42D, iron material 43A, iron material 43B, iron material 43C and iron material 43D is the same as the stage plate 40, and the stage plate 40, permanent magnet 42A, The front and rear surfaces of the permanent magnet 42B, the permanent magnet 42C, the permanent magnet 42D, the iron material 43A, the iron material 43B, the iron material 43C, and the iron material 43D are all continuous (they are flush).

Although not shown, since the front fixed support substrate 21 is provided with a movement range restricting means for restricting the movement range of the stage plate 40 to a specific range, the S pole and the N pole of the iron core 32A are made of the iron material 43A. The N pole and S pole of the iron core 32C always face each other, and the S pole and N pole of the iron core 32C always face each other. Similarly, the S pole and N pole of the iron core 32B are always opposite to the N pole and S pole of the iron material 43B, respectively, and the S pole and N pole of the iron core 32D are always opposite to the N pole and S pole of the iron material 43D, respectively. .
As shown in FIG. 2, the S pole and the N pole of the iron core 32A and the iron core 32C are wider than the N pole and the S pole of the iron material 43A and the iron material 43C, and the S pole and the N pole of the iron core 32B and the iron core 32D. Is wider than the N pole and S pole of the iron material 43B and the iron material 43D. Further, as shown in FIG. 3, the stage plate 40, the permanent magnet 42A, the permanent magnet 42B, the permanent magnet 42C, the permanent magnet 42D, the iron material 43A, the iron material 43B, the iron material 43C, and the iron material 43D are composed of an iron core 32A, an iron core 32B, and iron. It is located on the plane where the core 32C and the iron core 32D are located.

A biaxial Hall sensor 45 facing the permanent magnet 37 in the Z direction is fixed to the center of the rear surface of the stage plate 40. The biaxial Hall sensor 45 detects a position in the X direction and a position in the Y direction with respect to the rear fixed support substrate 22 of the stage plate 40 using a magnetic field generated by the permanent magnet 37.
An imaging element 47 whose front surface constitutes the imaging surface 48 is fixed to the center of the front surface of the stage plate 40. As shown in FIG. 2, the image sensor 47 includes a pair of upper and lower X direction sides 47X parallel to the upper and lower sides of the stage plate 40, and a pair of left and right Y direction sides 47Y parallel to the right and left sides of the stage plate 40. is doing. As shown in FIG. 2, when the stage plate 40 is located at the initial position where the center of the imaging surface 48 and the optical axis O overlap, the pair of X direction sides 47X are parallel to the X direction, and the pair of Y direction sides 47Y are Y Parallel to the direction. A rear end portion of the holder 49 is fixed around the imaging element 47 on the front surface of the stage plate 40, and a window hole 50 facing the imaging surface 48 in the Z direction is formed in the front surface of the holder 49. Further, an optical low-pass filter 51 is fixed to the rear surface of the front wall of the holder 49.
As shown in FIG. 1, a two-axis gyro sensor GS (vibration detection sensor) for detecting the vibration of the camera body 12 is fixed inside the camera body 12, and the two-axis gyro sensor GS is connected to the camera body 12. It is electrically connected to control means C (power supply means) constituted by a CPU or the like fixed inside. Further, the control means C is electrically connected to the coil 33A, the coil 33B, the coil 33C, the coil 33D, the biaxial Hall sensor 45, the image sensor 47, and the battery B (see FIG. 1, power supply means).

Next, operations of the digital camera 10 and the hand shake correction device 20 will be described.
When the photographer presses the main switch MS (see FIG. 1) provided on the camera body 12, the control means C causes the power of the battery B to flow through the coils 33A, 33B, 33C, and 33D. At this time, a current in the same direction flows through the coil 33A and the coil 33C so that the coil 33A is larger than the coil 33C. Therefore, between the N pole of the iron core 32A and the S pole of the iron material 43A, between the S pole of the iron core 32A and the N pole of the iron material 43A, between the N pole of the iron core 32C and the S pole of the iron material 43C, and the iron core A suction force is generated between the 32C south pole and the iron 43C north pole. Further, the attraction force that pulls upward the unitary object composed of the stage plate 40, the permanent magnet 42A, the permanent magnet 42B, the permanent magnet 42C, the permanent magnet 42D, the iron material 43A, the iron material 43B, the iron material 43C, the iron material 43D, the biaxial hall sensor 45, and the like. The attraction between the N pole of the iron core 32A and the S pole of the iron material 43A, and between the S pole of the iron core 32A and the N pole of the iron material 43A, is the S pole of the iron core 32C and the iron material 43C. And between the S pole of the iron core 32C and the N pole of the iron material 43C.
On the other hand, since currents of the same direction and magnitude flow in the coils 33B and 33D, between the north pole of the iron core 32B and the south pole of the iron material 43B, between the south pole of the iron core 32B and the north pole of the iron material 43B. The same attractive force is generated between the N pole of the iron core 32D and the S pole of the iron material 43D and between the S pole of the iron core 32D and the N pole of the iron material 43D.
Therefore, the stage plate 40 moves to the initial position shown in FIG. 2 and is held at the initial position.

Next, when the camera shake correction switch SW (see FIG. 1) provided on the camera body 12 is turned on, the biaxial gyro sensor GS provided on the camera body 12 detects the camera shake amounts of the camera body 12 in the X direction and the Y direction. Therefore, for example, the camera body 12 is shaken on the right side in the X direction (right direction when the camera shake correction device 20 is viewed from the rear. The same applies to the case of “left side”), and the biaxial gyro sensor GS detects this shake. Then, the control means C increases the magnitude of the current flowing through the coil 33D (or reduces the magnitude of the current flowing through the coil 33B). Then, the suction force generated between the iron core 32 D and the iron material 43 D is larger than the suction force generated between the iron core 32 B and the iron material 43 B, so that the stage plate 40 acts on the front side fixed support substrate 21 and the rear side fixed support substrate 22. 2 is moved to the left in the X direction, and the amount of movement of the stage plate 40 to the left detected by the biaxial Hall sensor 45 matches the amount of camera shake to the right of the camera body 12, thereby correcting the camera shake. The
When camera shake on the left side in the X direction occurs in the camera body 12, the control means C causes the coil 33B to pass a large current (or reduce the magnitude of the current flowing through the coil 33D) to move the stage plate 40 to the right in the X direction. To correct camera shake. Further, when the camera body 12 is shaken on the upper side in the Y direction, the control means C causes a large current to flow through the coil 33C (or a smaller current flows to the coil 33A) to move the stage plate 40 downward in the Y direction. When the camera shake is corrected by moving the camera body 12 and the camera body 12 is shaken downward in the Y direction, the control means C causes a large current to flow through the coil 33A (or reduces the magnitude of the current flowing through the coil 33C). ) The camera shake is corrected by moving the stage plate 40 upward.
When the shutter button (not shown) is fully pressed with the camera shake corrected in this way, an image free from image blur is picked up by the image sensor 47.
Further, when there is no camera shake before or after imaging by the image sensor 47, the two-axis gyro sensor GS detects that there is no camera shake. Then, the control means C controls the current flowing through the coil 33A, coil 33B, coil 33C, and coil 33D to return the stage plate 40 to the initial position and hold it at the initial position.

According to the present embodiment described above, the electromagnet 31A, the electromagnet 31B, the electromagnet 31C, and the electromagnet 31D fixed to the front fixed support substrate 21, the permanent magnet 42A (iron material 43A), and the permanent magnet 42B (iron material) fixed to the stage plate 40. 43B), using the magnetic force generated between the permanent magnet 42C (iron material 43C) and the permanent magnet 42D (iron material 43D), the stage plate 40 is placed in the X direction with respect to the front fixed support substrate 21 and the rear fixed support substrate 22. Since it is moved in the Y direction, the stage plate 40 can be driven with less electric power than in the prior art using an electromagnet and an iron core.

Further, a cutout 41A, a cutout 41B, a cutout 41C, and a cutout 41D are formed in the stage plate 40, and a permanent magnet 42A and an iron material 43A, a permanent magnet 42B and an iron material 43B, a permanent magnet 42C and an iron material 43C, and a permanent magnet 42D and an iron material 43D are formed thereon. The front surface and the rear surface are fitted so that the front surface and the rear surface of the stage plate 40 are continuous with each other, and the stage plate 40, the permanent magnet 42A and the iron material 43A, the permanent magnet 42B and the iron material 43B, the permanent magnet 42C and the iron material 43C, and the permanent magnet. 42D and the iron material 43D are positioned on the same plane as the iron core 32A, the iron core 32B, the iron core 32C, and the iron core 32D, so that the permanent magnet 42A and the iron material 43A, the permanent magnet 42B and the iron material 43B, the permanent magnet 42C and the iron material As compared with the case where 43C, the permanent magnet 42D and the iron material 43D are fixed to the front surface or the rear surface of the stage plate 40, the camera shake is corrected. It can be made thin configure the location 20.
Moreover, the S pole and the N pole of the iron core 32A and the iron core 32C are wider than the N pole and the S pole of the iron material 43A and the iron material 43C, and the S pole and the N pole of the iron core 32B and the iron core 32D are the iron material 43B and the iron material. Since it is wider than the 43D N-pole and S-pole, the S-pole and N-pole of the iron core 32A and the iron core 32C are always connected to the N-pole and S-pole of the iron material 43A and the iron material 43C, respectively, even if the stage plate 40 moves from the initial position. The S pole and the N pole of the iron core 32B and the iron core 32D can always be opposed to the N pole and the S pole of the iron material 43B and the iron material 43D, respectively.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are designated by the same reference numerals, and detailed description thereof is omitted.
The feature of this embodiment lies in the hand shake correction device 20, and there are two differences when compared with the hand shake correction device 20 of the first embodiment.
The first difference is the configuration of the electromagnet 60A, the electromagnet 60B, the electromagnet 60C, and the electromagnet 60D. That is, the electromagnet 60A (the first magnet for Y), the electromagnet 60B (the first magnet for X), the electromagnet 60C (the first magnet for Y), and the electromagnet 60D (the first magnet for X) are the soft magnetic body 61A and the soft magnetic body. The coil 33A, the coil 33B, the coil 33C, and the coil 33D are wound around the 61B, the soft magnetic body 61C, and the soft magnetic body 61D, and both ends of the soft magnetic body 61A, the soft magnetic body 61B, the soft magnetic body 61C, and the soft magnetic body 61D In addition, the permanent magnet 61AN (magnetic field generating unit) and the permanent magnet 61AS (magnetic field generating unit), the permanent magnet 61BN (magnetic field generating unit) and the permanent magnet 61BS (magnetic field generating unit), the permanent magnet 61CN (magnetic field generating unit) and the permanent magnet 61CS. (Magnetic field generator), permanent magnet 61DN (magnetic field generator) and permanent magnet 61DS (magnetic field generator) are provided. The permanent magnets 61CN and 61CS are stronger than the permanent magnets 61AN and 61AS (the permanent magnet 61CN and the permanent magnet 61CS have the same strength, and the permanent magnet 61AN and the permanent magnet 61AS have the same strength), the permanent magnets 61BN, 61BS, 61DN, 61DS is all the same strength. Permanent magnets 61AS, 61BS, 61CS, 61DS have S poles facing the respective S poles of iron materials 43A, 43B, 43C, 43D, and permanent magnets 61AN, 61BN, 61CN, 61DN are iron materials 43A, 43B, 43C. , 43D are opposed to the N poles.
The coil 33A, the coil 33B, the coil 33C, and the coil 33D are directly fixed to the front fixed support substrate 21 without using the pedestal 30. By the action of the moving range regulating means, the N pole of the permanent magnet 61AN, the permanent magnet 61BN, the permanent magnet 61CN, and the permanent magnet 61DN is the N pole of the iron material 43A, the N pole of the iron material 43B, the N pole of the iron material 43C, and the N pole of the iron material 43D. The S poles of the permanent magnet 61AS, permanent magnet 61BS, permanent magnet 61CS, and permanent magnet 61DS are respectively the S pole of the iron material 43A, the S pole of the iron material 43B, the S pole of the iron material 43C, and the S pole of the iron material 43D. Always face each other.

Since the electromagnet 60A, the electromagnet 60B, the electromagnet 60C, and the electromagnet 60D are configured in this way, the N pole of the permanent magnet 61AN and the N pole of the iron material 43A can be obtained without passing current through the coils 33A, 33B, 33C, and 33D. And a repulsive force of the same magnitude is generated between the south pole of the permanent magnet 61AS and the south pole of the iron material 43A, between the north pole of the permanent magnet 61CN and the north pole of the iron material 43C, and the south pole of the permanent magnet 61CS. The repulsion between the N pole of the permanent magnet 61AN and the N pole of the iron material 43A and between the S pole of the permanent magnet 61AS and the S pole of the iron material 43A is the same size between the pole and the S pole of the iron material 43C. A repulsive force greater than the force is generated. On the other hand, between the N pole of the permanent magnet 61BN and the iron material 43B, between the S pole of the permanent magnet 61BS and the iron material 43B, between the N pole of the permanent magnet 61DN and the iron material 43D, and between the S pole 61SN and the S pole of the iron material 43D. Have the same repulsive force. Therefore, the stage plate 40 is held in the vicinity of the initial position without passing a current through the coil 33A, the coil 33B, the coil 33C, and the coil 33D.

When the photographer presses the main switch MS provided on the camera body 12, the control means C causes the power of the battery B to flow through the coil 33A, the coil 33B, the coil 33C, and the coil 33D, and moves the stage plate 40 to the initial position. As described above, since the stage plate 40 is held in the vicinity of the initial position even if no current is passed through the coils 33A, 33B, 33C, and 33D, the current necessary for the movement of the stage plate 40 to the initial position is maintained. Is a small amount.
If the control means C controls (increases / decreases) the current flowing through the coil 33A, coil 33B, coil 33C, and coil 33D when the camera body 12 is shaken, the stage plate 40 moves in the X direction and / or Since it moves in the Y direction, camera shake can be corrected as in the first embodiment.

As apparent from FIG. 6, the second difference is that the stage plate 40, the permanent magnet 42A and the iron material are compared with the plane on which the permanent magnets 61AS, 61AN, 61BS, 61BN, 61CN, 61CS, 61DN, 61DS are located. 43A, the plane where the permanent magnet 42B and the iron material 43B, the permanent magnet 42C and the iron material 43C, and the permanent magnet 42D and the iron material 43D are located is located on the rear fixed support substrate 22 side.
Since the stage plate 40, the permanent magnet 42A and the iron material 43A, the permanent magnet 42B and the iron material 43B, the permanent magnet 42C and the iron material 43C, the permanent magnet 42D and the iron material 43D are arranged in this positional relationship, as shown by the arrows in FIG. The iron material 43A is subjected to a biasing force from the south pole of the permanent magnet 61AS and the north pole of the permanent magnet 61AN to the rear fixed support substrate 22 side, and the iron material 43C has the south pole of the permanent magnet 61CS and the north pole of the permanent magnet 61CN. A biasing force is applied to the rear fixed support substrate 22 side. Similarly, an urging force is applied to the iron material 43B from the south pole of the permanent magnet 61BS and the north pole of the permanent magnet 61BN to the rear fixed support substrate 22 side, and the iron material 43D has the south pole of the permanent magnet 61DS and the N pole of the permanent magnet 61DN. Since an urging force is applied from the pole to the rear fixed support substrate 22 side, the rear surface of the stage plate 40 always contacts the ball 36 (support member) in a rotatable manner.

As described above, in this embodiment, the stage plate 40 can be held near the initial position without passing current through the coil 33A, coil 33B, coil 33C, and coil 33D, so that further energy saving can be achieved as compared with the first embodiment. It is possible to plan.
Furthermore, since the stage plate 40 can be moved and held at the initial position with a weak current, control during hand shake correction is also easier than in the first embodiment.

Further, the number of windings of the coils 33A, 33B, 33C, and 33D can be reduced as compared with the first embodiment. Therefore, it is possible to further reduce the size and weight of the hand shake correction device 20.
Moreover, since the rear surface of the stage plate 40 always contacts the ball 36 in a rotatable manner by the magnetic force of the permanent magnets 61AS, 61AN, 61BS, 61BN, 61CN, 61CS, 61DN, 61DS, the four required in the first embodiment The support protrusion 28 and the ball 29 are unnecessary. Therefore, it is possible to reduce the number of parts compared to the first embodiment.

As mentioned above, although this invention was demonstrated using the said embodiment, this invention is not limited to this embodiment, It can implement, giving various changes.
For example, as shown in FIGS. 7 and 8, notches 27 are formed on both left and right sides of the front fixed support substrate 21 of the first embodiment, and electromagnets 70B (first X magnets) and electromagnets are formed on the left and right notches 27. 70D (first magnet for X) may be fitted and fixed.
The electromagnet 70B and the electromagnet 70D are formed by winding a coil 33B and a coil 33D around a plate-shaped iron core 71B and an iron core 71D having a substantially rectangular shape in a side view, and S made of a magnetic material on upper and lower end surfaces of the iron core 71B and the iron core 71D. The pole member 72BS (magnetic field generator), the N pole member 72BN (magnetic field generator), the S pole member 72DS (magnetic field generator) and the N pole member 72DN (magnetic field generator) are fixed, and the coils 33B and 33D are cut away. 27 is fixed to the wall surface. The iron core 71B and the iron core 71D are plate-like members having a plate thickness in the Z direction larger than that in the X direction, and the S pole member 72BS, the N pole member 72BN, the S pole member 72DS, and the N pole member 72DN are in the X direction from the Z direction. This is a plate-like member having a large plate thickness.
According to such a modification, the X-direction dimensions of the electromagnet 70B and the electromagnet 70D can be made smaller than those of the electromagnet 31B and the electromagnet 31D of the first embodiment. It is possible to reduce the size according to the embodiment.
The electromagnet 31A and the electromagnet 31C of the first embodiment have the same configuration as the electromagnet 70B and the electromagnet 70D, or the electromagnet 60A, the electromagnet 60B, the electromagnet 60C, and the electromagnet 60D of the second embodiment are the same as the electromagnet 70B and the electromagnet 70D. The same configuration is also possible.

Further, as shown in FIG. 9, both the front and rear surfaces of the permanent magnet 42C and the iron material 43C of the first or second embodiment (including the above-described modification) are flat, and the front surfaces of the permanent magnet 42C and the iron material 43C are continuous with each other. A connecting plate 75 made of PET (polyethylene terephthalate) may be adhered between the space and the rear surface, and the permanent magnet 42C and the iron material 43C may be joined by the connecting plate 75 before and after.
In this way, the permanent magnet 42C and the iron material 43C can be fixed more easily and reliably than when the end surfaces of the permanent magnet 42C and the iron material 43C are bonded together.
The coupling method using the connecting plate 75 is naturally applicable to the permanent magnet 42A and the iron material 43A, the permanent magnet 42B and the iron material 43B, or between the permanent magnet 42D and the iron material 43D.

Furthermore, as shown in FIG. 10, you may comprise the protrusion which comprises a south pole and a north pole a little inside from the right-and-left both ends of the iron core 32C of the electromagnet 31C.
Further, as shown in FIG. 11, a permanent magnet 61CN and a permanent magnet 61CS may be provided so as to protrude slightly from the ends of the left and right soft magnetic bodies 61C.
10 is naturally applicable to the electromagnet 31A, the electromagnet 31B, and the electromagnet 31D, and the modification of FIG. 11 is naturally applicable to the electromagnet 60A, the electromagnet 60B, and the electromagnet 60D.

Furthermore, in the first embodiment, the iron core 32A, the iron core 32B, the iron core 32C, and the iron core 32D are replaced with permanent magnets as in the second embodiment, and the four permanent magnets, the iron material 43A, the iron material 43B, A suction force may be generated between the iron material 43C and the iron material 43D. Further, when the iron core 32A, iron core 32B, iron core 32C, and iron core 32D are replaced with permanent magnets in this way, the stage plate 40 is placed on the front fixed support substrate 21 side or rear fixed support substrate rather than the permanent magnets. The stage plate 40 is positioned on the front fixed support substrate 21 side or the rear fixed support substrate 22 side by using the attractive force generated between the permanent magnet and the iron material 43A, iron material 43B, iron material 43C, and iron material 43D. The front or rear surface of the stage plate 40 may be brought into contact with one of the ball 29 and the ball 36, and the other of the ball 29 (and the support protrusion 28) and the ball 36 (and the support protrusion 35) may be omitted. .
Further, the X-direction dimensions of the S pole and N pole of the iron material 43A and the iron material 43C fixed to the stage plate 40 are made larger than the X-direction dimensions of the S pole and N pole of the iron core 32A, the iron core 32C, or the permanent magnet 61AS, You may make it larger than the X direction dimension of permanent magnet 61AN, permanent magnet 61CS, and permanent magnet 61CN. Similarly, the Y direction dimension of the S pole and the N pole of the iron material 43B and the iron material 43D is made larger than the Y direction dimension of the S pole and the N pole of the iron core 32B and the iron core 32D, or the permanent magnet 61BS, the permanent magnet 61BN, The size of the magnet 61DS, the permanent magnet 61DN, the S pole member 72BS, the N pole member 72BN, the S pole member 72DS, and the N pole member 72DN may be larger than the dimension in the Y direction.
Further, in the first and second embodiments, the thicknesses of the permanent magnet 42A, the iron material 43A, the permanent magnet 42B, the iron material 43B, the permanent magnet 42C, the iron material 43C, the permanent magnet 42D, and the iron material 43D are determined by the thickness of the stage plate 40. The permanent magnet 42A, the iron material 43A, the permanent magnet 42B, the iron material 43B, the permanent magnet 42C, the iron material 43C, the permanent magnet 42D, and the iron material 43D are not protruded from the front and rear surfaces of the stage plate 40, and the cutout 41A, the cutout 41B, and the cutout 41C. Alternatively, it may be carried out in the notch 41D.

Further, the magnet fixed to the front fixed support substrate 21 may be a permanent magnet (not an electromagnet), and the magnet fixed to the stage plate 40 may be an electromagnet.
Furthermore, iron core 32A, iron core 32B, iron core 32C, iron core 32D, iron material 43A, iron material 43B, iron material 43C, iron material 43D, iron core 71B, iron core 71D, S pole member 72BS, S pole member 72DS, N pole Although iron is used as the material of the member 72BN and the N-pole member 72DN, a magnetic body other than iron may be used as these materials.

Also, as shown in FIG. 12, the camera shake correction device 20 is provided between the lens L1 and the lens L3 (the positional relationship with the other lenses of the camera shake correction device 20 is not limited to this), and the center of the stage plate 40 The lens holding hole is provided as a through hole in the part, the correction lens CL is fitted and fixed in the lens holding hole, and the imaging element 47 located immediately after the lens L3 is fixed inside the camera body 12 Also good.
Even if the correction lens CL of the camera shake correction apparatus 20 is moved straight in the X direction and the Y direction, the camera shake correction can be performed. Furthermore, the camera shake correction apparatus 20 using such a correction lens CL can be applied to a silver salt camera by omitting the image sensor 47.

Furthermore, the present invention can also be applied to a stage apparatus (an apparatus in which a specific member can linearly move or rotate in the X direction or the Y direction) that has a different use from the hand shake correction apparatus.

1 is a longitudinal side view of a digital camera including a camera shake correction device according to a first embodiment of the present invention. It is a rear view which abbreviate | omits the camera-shake correction apparatus, and abbreviate | omits the back side fixed support substrate. It is sectional drawing which follows the III-III arrow line of FIG. It is the top view seen in the IV arrow line direction of FIG. It is a back view similar to FIG. 2 of the camera-shake correction apparatus of the 2nd Embodiment of this invention. It is sectional drawing which follows the VI-VI arrow line of FIG. It is a rear view similar to FIG. 2 of a modification. It is the bottom view seen in the VI arrow line direction of FIG. It is a bottom view of the stage board of another modification. It is a top view of the permanent magnet and iron material of another modification, and an electromagnet. It is a top view of the permanent magnet and iron material of another modification, and an electromagnet. It is a vertical side view of the digital camera of another modification.

Explanation of symbols

10 Digital camera (camera)
DESCRIPTION OF SYMBOLS 11 Lens barrel 12 Camera body 20 Camera shake correction apparatus 21 Front side fixed support substrate (fixed support substrate)
22 Rear Fixed Support Substrate 23 Connecting Column 24 Window Hole 25 Support Frame 26 Infrared Cut Filter 28 Support Projection 29 Ball 30 Base 31A 31B 31C 31D Electromagnet (first magnet for X, first magnet for Y)
32A 32B 32C 32D Iron core 33A 33B 33C 33D Coil 35 Support protrusion 36 Ball (support member)
40 Stage plate (stage member)
41A 41B 41C 41D Notch 42A 42B 42C 42D Permanent magnet (second magnet for X, second magnet for Y)
43A 43B 43C 43D Iron material 45 Biaxial Hall sensor 47 Image sensor 47X X direction side 47Y Y direction side 48 Imaging surface 49 Holder 50 Window hole 51 Optical low pass filter 60A 60B 60C 60D Electromagnet (first magnet for X, first magnet for Y) )
61A 61B 61C 61D Soft magnetic material 61AN 61BN 61CN 61DN Permanent magnet (magnetic field generator)
61AS 61BS 61CS 61DS Permanent magnet (magnetic field generator)
70B 70D electromagnet (first magnet for X)
71B 71D Iron core 72BS 72DS S pole member (magnetic field generator)
72BN 72DN N pole member (magnetic field generator)
75 connecting plate B battery (power supply means)
C Control means (power supply means)
CL correction lens GS 2-axis gyro sensor (vibration detection sensor)
O Optical axis MS Main switch SW Vibration compensation switch

Claims

A pair of X first magnets arranged in a specific X direction fixed to a fixed support substrate;
A stage member capable of moving relative to the fixed support substrate on a specific reference plane;
A pair of Xs that are attracted or repelled in the X direction between the pair of first X magnets fixed to the stage member and facing each other in the X direction and facing the first X magnets. A second magnet,
One of the first X magnet and the second X magnet facing each other is a permanent magnet and the other is an electromagnet.
The stage apparatus according to claim 1, wherein
A stage apparatus in which both the first X magnet and the second X magnet are located on a specific plane parallel to the reference plane.
The stage apparatus according to claim 1 or 2,
A support member that movably supports the stage member is provided on the opposite side of the fixed support substrate across the stage member,
A stage device in which the second X magnet is positioned closer to the support member than the first X magnet.
The stage apparatus according to any one of claims 1 to 3,
The first X magnet is provided with a pair of magnetic field generators parallel to the reference plane and spaced apart from each other in the Y direction perpendicular to the X direction, and the second X magnet is opposed to the magnetic field generator. A stage apparatus provided with a pair of magnetic field generators separated from each other in the Y direction.
The stage apparatus according to claim 4, wherein
A stage apparatus in which a permanent magnet of the first X magnet and the second X magnet is provided with a pair of the magnetic force generation units that are respectively continuous with the N pole and the S pole of the permanent magnet and made of a magnetic material.
The stage apparatus according to claim 5, wherein
A stage apparatus in which a plane that is flush with the permanent magnet and the magnetic body is formed, and a connecting plate made of PET is bonded to the planes of the permanent magnet and the magnetic body.
The stage device according to any one of claims 4 to 6,
The stage apparatus which formed the said magnetic field generation | occurrence | production part in the both ends of the Y direction of at least one of the said 1st magnet for X and the 2nd magnet for X.
The stage apparatus according to any one of claims 4 to 7,
A stage device in which the Y-direction dimension of one of the magnetic field generation units of the first X magnet and the second X magnet is larger than the other magnetic field generation unit.
The stage apparatus according to any one of claims 1 to 8,
A stage device in which the plate thickness of the second magnet for X is equal to or less than the stage member, and both the front and back surfaces of the second magnet for X are not projected from both the front and back surfaces of the stage member and are contained within the plate thickness of the stage member.
The stage apparatus according to any one of claims 1 to 9,
A stage apparatus having a structure in which the electromagnet constituting one of the first X magnet and the second X magnet has a coil wound around a core made of a magnetic material.
The stage apparatus according to any one of claims 1 to 10,
A pair of first Y magnets arranged in the Y direction orthogonal to the X direction fixed to the fixed support substrate;
A pair of Y that are attracted or repelled in the Y direction between the two first Y magnets fixed to the stage member and facing each other in the Y direction and facing the first Y magnet. A second magnet,
One of the first Y magnet and the second Y magnet facing each other is a permanent magnet and the other is an electromagnet.
The stage apparatus according to claim 11, wherein
The stage device in which the first magnet for Y and the second magnet for Y are both located on a specific plane parallel to the reference plane.
The stage apparatus according to claim 11 or 12,
A support member that movably supports the stage member is provided on the opposite side of the fixed support substrate across the stage member,
A stage device in which the second magnet for Y is positioned closer to the support member than the first magnet for Y.
The stage apparatus according to any one of claims 11 to 13,
The first magnet for Y is provided with a pair of magnetic field generators parallel to the reference plane and spaced apart from each other in the X direction, and the second magnet for Y is opposed to the magnetic field generators in the X direction. A stage apparatus provided with a pair of spaced magnetic field generating units.
The stage apparatus according to claim 14, wherein
A stage apparatus provided with a pair of the magnetic force generators, each of which is continuous with the N pole and the S pole of the permanent magnet and made of a magnetic material, in the first magnet for Y and the second magnet for Y.
The stage apparatus according to claim 15, wherein
A stage apparatus in which a plane that is flush with the permanent magnet and the magnetic body is formed, and a connecting plate made of PET is bonded to the planes of the permanent magnet and the magnetic body.
The stage apparatus according to any one of claims 14 to 16,
A stage apparatus in which the magnetic field generator is formed at both ends of at least one of the first Y magnet and the second Y magnet.
The stage apparatus according to any one of claims 14 to 17,
A stage apparatus in which the X direction dimension of one of the magnetic field generation units of the first Y magnet and the second Y magnet is larger than the other magnetic field generation unit.
The stage apparatus according to any one of claims 11 to 18,
A stage apparatus in which the thickness of the second Y magnet is equal to or less than the stage member, and the front and back surfaces of the second Y magnet are not projected from the front and back surfaces of the stage member and are contained within the thickness of the stage member.
The stage apparatus according to any one of claims 11 to 19,
A stage apparatus having a structure in which the electromagnet constituting one of the first Y magnet and the second Y magnet is wound around a core made of a magnetic material.
A camera shake correction device using the stage device according to any one of claims 11 to 20,
The stage device built in the camera;
An image sensor fixed to the front surface of the stage member;
A vibration detection sensor for detecting vibrations in the X direction and Y direction of the camera;
Power supply means for supplying power to the electromagnet,
Based on the vibration information detected by the vibration detection sensor, the power supply means is one of the electromagnets of the first X magnet and the second X magnet so as to cancel the camera shake generated in the camera, and the A camera shake correction device for a camera in which a current is supplied to an electromagnet of the first Y magnet and the second Y magnet.
A camera shake correction device using the stage device according to any one of claims 11 to 20,
The stage device built in the camera;
A correction lens fixed to the stage member;
A vibration detection sensor for detecting vibrations in the X direction and Y direction of the camera;
Power supply means for supplying power to the electromagnet,
Based on the vibration information detected by the vibration detection sensor, the power supply means is one of the electromagnets of the first X magnet and the second X magnet so as to cancel the camera shake generated in the camera, and the A camera shake correction device for a camera in which a current is supplied to an electromagnet of the first Y magnet and the second Y magnet.