JPH117051A - Lens shifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely shift a lens in a perpendicular direction to an optical without backlash in an optical axis direction by providing an elastic member generating pressing force for holding 1st and 2nd balls. SOLUTION: The lens 9 is supported in parallel with a reference plane perpendicular to the optical axis where a movable frame unit 8u is provided in a supporting frame 1 by the appropriate pressing of the elastic member 18 in the optical axis direction through ball groups (steel ball) 2 and 6 and a guiding member 4 without backlash in the optical axis direction, so that it is shifted on the plane perpendicular to the optical axis. Thus, the deterioration of optical performance caused by the tilt to the optical axis and the backlash in the optical axis direction is hardly caused. Since rolling friction by the balls (steel ball) 2 and 6 having smaller resistance than frictional resistance by the sliding of a shaft and a bearing is used, shift driving force by electromagnetic driving is made weak. Since the rotation of a movable frame 8 around the optical axis is prevented by the member 4 without using restoring force by a spring member, the load from the spring member is not exerted on the unit 8u at the time of shifting, and the shift driving force by the electromagnetic driving is made weak.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a lens shift device for shifting a lens in a direction perpendicular to an optical axis.

[0002]

2. Description of the Related Art A mechanism for shifting a part of lenses of a lens group constituting a photographing lens in a direction perpendicular to an optical axis is used, for example, in a camera by detecting acceleration of camera shake which is a cause of image shake. The present invention can be used for an image stabilizing optical system that suppresses image blur by predicting blur and shifting a lens in a direction perpendicular to the optical axis based on the predicted signal.

[0003] As such a lens shift mechanism,
As disclosed in JP-A-3-188430, the camera shake is decomposed into a shake in a direction in which the camera is shaken horizontally (hereinafter referred to as yaw direction) and a shake in a direction in which the camera is shaken vertically (hereinafter referred to as pitch direction). A lens (hereinafter referred to as a correction lens) is slid by a guide bar and a bearing in both the yaw direction and the pitch direction so that the lens can be shifted independently in the yaw direction and the pitch direction without causing movement in the optical axis direction. Alternatively, it is configured such that surfaces such as a sliding plate slide.

In Japanese Patent Application Laid-Open No. 63-155038,
The correction lens is held while restricting the rotation around the optical axis by the parallel four-bar link, and the movement in the optical axis direction by the parallel four-bar link is absorbed by the guide and the urging spring so as not to reach the correction lens. The spring is pressed against a reference plane with a ball interposed therebetween.

Further, in Japanese Patent Application Laid-Open No. 5-297443, in addition to a member for restricting rotation of the correction lens around the optical axis, at least three supporting points such as balls are provided between the support frame and the fixing frame of the correction lens. The correction lens is pressed and shifted by the pressurizing means, and the correction lens is shifted so as to be surely kept perpendicular to the optical axis.

In Japanese Patent Application Laid-Open No. 7-294975, X
The correction lens is independently advanced and retracted by the feed screw in the axis (yaw) direction and the Y axis (pitch) direction, and a roller is interposed between the correction lens frame and the movable member so that the driving directions do not interfere with each other. It is possible. Further, a ball is interposed between the correction lens frame and the base so that the correction lens does not fall down during the shift, and the ball is biased by a spring.

Apart from these known examples, as means for restricting the rotation of the correction lens about the optical axis, the restoring force of a spring member (tensile coil spring) is used, and the initial position of the correction lens is returned by balancing the plurality of spring members. It is also conceivable that they are constructed in a form that can be done.

[0008]

However, in Japanese Patent Application Laid-Open No. Hei 3-188430, the sliding resistance due to friction is large, and the energy required to shift-drive the correction lens by electromagnetic force is large. In addition, there is an inconvenience that the movement in the optical axis direction is strictly caused by minute play caused by fitting between the guide bar and the bearing.

In Japanese Patent Application Laid-Open No. 63-155038,
Since the lens barrel and the annular member are loosely fitted, rattling occurs in the direction perpendicular to the optical axis, albeit little. Further, when driving, sliding resistance occurs due to friction at the loose fitting portion, and the merit of a ball having low driving resistance as in a hinge portion of a link having low driving resistance is impaired. In addition, the mechanism is complicated by the parallel four-bar link and the parallel support by the ball, the number of parts is large, and the cost is increased.
In addition, although only a one-way shift mechanism is disclosed, even if the mechanism is provided in a direction perpendicular to the above-mentioned direction, it is not possible to easily shift in an oblique direction due to the structure of the parallel four-bar link. There was an inconvenience.

In Japanese Patent Application Laid-Open No. 5-297443, means for restricting rotation of the correction lens around the optical axis is sliding by fitting between a guide bar and a bearing or sliding by a slot and a pin. The sliding resistance due to friction cannot be said to be small enough, and in addition to the means for regulating the rotation of the correction lens around the optical axis, it also has at least three balls and pressurizing means, making the mechanism complicated. However, there is a disadvantage that the number of parts is large and the cost is increased.

In Japanese Patent Application Laid-Open No. 7-294975, a sliding friction resistance generating portion is provided between a guide member of a movable member and a guide shaft, and rolling friction resistance by a roller between the correction lens frame and the movable member is added. The resistance at the time of shift driving of the correction lens is large. In addition, a support mechanism using a ball is added thereto, which complicates the mechanism, increases the number of parts, and increases the cost.

Further, in a device using the restoring force of a spring member (tensile coil spring) and the balance of a plurality of spring members as means for restricting the rotation of the correction lens around the optical axis, the shift driving of the correction lens is indispensable. Since a load is applied to the spring member, a load is imposed on the driving unit due to the electromagnetic force. In addition, as the shift amount of the correction lens increases, the displacement of the spring member increases and the load increases, so that a heavy load is imposed on the shift driving unit due to the electromagnetic force. Therefore, in order to accurately control the shift position of the correction lens, the force of the shift driving unit due to the electromagnetic force must be increased, which causes an increase in the size of the shift driving unit and an increase in energy applied to the shift driving unit. was there.

(Object of the Invention) A first object of the present invention is to shift a lens in a direction perpendicular to the optical axis reliably with a simple structure and with as little drive resistance as possible and without play in the optical axis direction. It is an object of the present invention to provide a lens shift device capable of performing the above.

A second object of the present invention, in addition to the first object, is to provide a lens shift device which enables high-precision shift position control without minute backlash in a shift plane of a lens. It is.

A third object of the present invention, in addition to the first object, is to prevent deformation of the first and second ball holding portions and the first and second groove portions due to external force and improve wear resistance. An object of the present invention is to provide a lens shift device that enables highly reliable and highly accurate shift position control.

A fourth object of the present invention, in addition to the third object, is to provide a lens shift device which enables high-precision shift position control without minute backlash in a shift plane of a lens. It is.

[0017]

According to a first aspect of the present invention, there is provided a lens for decentering an optical axis, a fixing member, and a lens for holding the lens. A movable member shifted in a plane perpendicular to the optical axis direction, a guide member provided between the fixed member and the movable member, and at least three members sandwiched between the fixed member and a first of the guide members. One first ball, at least three second balls sandwiched between the guide member and a second of the movable member, and the fixed member or the fixed member for rotatably holding the first ball. A first ball holding portion provided on a guide member, a second ball holding portion provided on the movable member or the guide member for rotatably holding the second ball, and the guide member or the fixed member; Said member A first groove for guiding the movable member in one direction via the guide member, the first groove being provided at a position facing the first ball holding portion with one ball interposed therebetween; and the guide member or the movable member. A second groove for guiding the movable member in one direction orthogonal to the first groove, the member being provided at a position of the member opposed to the second ball holding portion with the second ball interposed therebetween; And a resilient member for generating a pressing force for holding the first and second balls.

In the above arrangement, the movable member holding the lens is elastically supported on the fixed member by the first and second balls comprising at least three rotatable balls with the guide member interposed therebetween, and the first member is held by the first member. Using a groove and a first ball, the lens held by the movable member is shifted in one direction perpendicular to the optical axis, and using a second groove and a second ball,
The lens is shifted in a direction orthogonal to the one direction, and the guide member has a function of preventing the movable member from rotating around the optical axis.

In order to achieve the second object,
The present invention according to claims 2 and 5, wherein the lens that decenters the optical axis, a fixed member, a movable member that holds the lens and is shifted in a plane perpendicular to the optical axis direction, and the fixed member A guide member provided between the movable members,
At least three first balls held between the fixed member and a first of the guide members, and at least three second balls held between a second of the guide member and the movable member; The first ball is provided on the fixing member or the guide member to rotatably hold the first ball, and has a cross-sectional shape that abuts the first ball at two points. A first ball holding portion having a cross-sectional shape capable of regulating the position in two directions perpendicular to the optical axis and the direction, and the guide member or the movable member for rotatably holding the second ball. The ball has a cross-sectional shape that is in contact with the second ball at two points, and has a cross-sectional shape capable of regulating the position of the ball in two directions in the optical axis direction and the direction perpendicular to the optical axis at the corresponding contact point. Second ball holding And a cross-sectional shape of the guide member or the fixing member, which is provided at a position facing the first ball holding portion with the first ball interposed therebetween, and abuts the first ball at two points; Moreover, the contact point has a cross-sectional shape capable of regulating the position of the ball in the optical axis direction and the direction perpendicular to the optical axis in two directions, and for guiding the movable member in one direction via the guide member. A first groove portion, a cross-section of the movable member or the guide member, provided at a position facing the second ball holding portion with the second ball interposed therebetween, and contacting the second ball at two points; And has a cross-sectional shape capable of regulating the position of the ball in the optical axis direction and the direction perpendicular to the optical axis with respect to the ball at the corresponding contact point, and is movable in one direction orthogonal to the first groove portion. A second groove for guiding a member, In which a lens shift device having a first and an elastic member for generating a pressing force for holding the second set of balls.

In the above configuration, in addition to the first aspect of the invention, the ball holding portion and the groove portion are brought into contact with the ball at two points, and two directions of the optical axis direction and the direction perpendicular to the optical axis with respect to the ball at the corresponding contacts. The shape of the cross section can be restricted.

In order to achieve the third object,
According to a third aspect of the present invention, there is provided a lens for decentering an optical axis,
A fixed member, a movable member that holds the lens and is shifted in a plane perpendicular to the optical axis direction, a guide member provided between the fixed member and the movable member, the fixed member and the guide member Rotating at least three first balls sandwiched between the first of the first and second balls, at least three second balls sandwiched between the guide member and the second of the movable member, and rotating the first ball. A first ball holding portion fixed to the fixed member or the guide member for holding the first ball holding portion and made of a material harder than the fixed member or the guide member; and a rotatable holding of the second ball. A second ball holding portion fixed to the guide member or the movable member and made of a material harder than the guide member or the movable member, and sandwiching the first ball of the guide member or the fixed member; A first groove portion made of a material harder than the guide member or the fixed member for guiding the movable member in one direction via the guide member, the first groove portion being fixed at a position facing the first ball holding portion. And the movable member or the guide member is fixed to a position facing the second ball holding portion across the second ball, and guides the movable member in one direction orthogonal to the first groove portion. A lens shift device including a second groove portion made of a material harder than the movable member or the guide member, and an elastic member for generating a pressing force for clamping the first and second balls. is there.

In the above structure, in addition to the first aspect of the present invention, in order to increase the strength of the ball group holding portion and the groove, the ball group holding portion and the groove are made of a material harder than the support member, the guide member or the movable member. It is composed.

In order to achieve the fourth object,
The present invention according to claims 4 and 5, wherein the lens that decenters the optical axis, a fixed member, a movable member that holds the lens and is shifted in a plane perpendicular to the optical axis direction, and the fixed member. A guide member provided between the movable members,
At least three first balls held between the fixed member and a first of the guide members, and at least three second balls held between a second of the guide member and the movable member; The first ball is fixed to the fixing member or the guide member so as to rotatably hold the first ball, has a cross-sectional shape abutting on the first ball at two points, and has an optical axis with respect to the ball at a corresponding contact point. A first member made of a material harder than the fixing member or the guide member, the first member having a cross-sectional shape capable of restricting the position in two directions of a direction perpendicular to the optical axis;
A ball holding portion, and fixed to the guide member or the movable member to rotatably hold the second ball,
The guide having a cross-sectional shape that abuts the second ball at two points, and has a cross-sectional shape capable of restricting the position of the ball in two directions in an optical axis direction and a direction perpendicular to the optical axis at the corresponding contact point. A second ball holding portion made of a material harder than the member or the movable member, and the guide member or the fixed member is fixed to a position facing the first ball holding portion with the first ball interposed therebetween; A cross-sectional shape that is in contact with the first ball at two points, and has a cross-sectional shape that allows position control in two directions in the optical axis direction and the direction perpendicular to the optical axis with respect to the ball at the corresponding contact point; A first groove made of a material harder than the guide member or the fixed member for guiding the movable member in one direction, and the second groove of the movable member or the guide member sandwiching the second ball;
The ball is fixed at a position facing the ball holding portion, has a cross-sectional shape in which it contacts the second ball at two points, and has two points in the optical axis direction and the direction perpendicular to the optical axis with respect to the ball at the corresponding contact point. It has a cross-sectional shape capable of regulating the position,
A second groove portion made of a material harder than the movable member or the guide member for guiding the movable member in one direction orthogonal to the groove portion, and a pressing force for clamping the first and second balls. And a lens shift device having an elastic member.

In the above configuration, in addition to the third aspect of the invention, the ball holding portion and the groove portion are brought into contact with the ball at two points, and at the corresponding contact points in two directions, the optical axis direction to the ball and the direction perpendicular to the optical axis. The shape is such that it has a cross section that allows position regulation.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is an exploded perspective view of a lens shift device according to a first embodiment of the present invention, and FIG. 2 is a sectional view of the lens shift device of FIG. 1 (A taken along a two-dot chain line in FIG. 1).
FIG. 3 is a perspective view showing a schematic configuration of a general anti-vibration system.

First, an image blur suppression system (anti-vibration system) using an angular displacement detection device as a vibration sensor will be described.
This will be briefly described with reference to FIG.

FIG. 3 assumes a system that suppresses image shake caused by camera vertical shake 61p and camera horizontal shake 61y in the direction of arrow 61 in the figure.

In the figure, reference numeral 62 denotes a lens barrel having a photographing optical system, 63p and 63y denote angular displacement detecting devices for detecting camera vertical shake angular displacement and camera lateral shake angular displacement, respectively. 64p, 64y. 65
p and 65y are operation circuits, and the angular displacement detection devices 63p and 65y
Computes the signal from 63y and corrects the lens shift mechanism 66
Is converted into a drive target signal. Then, the correction lens shift mechanism 66 (67p, 67y is a drive unit thereof, and 68p, 68y is a shift position detection sensor of the correction lens) is driven by this signal to secure the stability on the image plane 69.

The shift mechanism of the correction lens in FIGS. 1 and 2 will be described.

Reference numeral 1 denotes a support frame, which has a cylindrical outer peripheral surface 1a fitted to a lens barrel (not shown) and is supported so as to be movable only in the optical axis direction. Reference numeral 1b denotes a front end surface of the support frame 1, and an opening 1c through which a photographing light beam passes is provided at the center thereof.
Reference numeral 2 denotes three supporting first balls (steel balls) (hereinafter referred to as first balls).
Reference numeral 3 denotes a first ball group holding portion, which is in a fitted state in which three first ball groups 2 can be rotated substantially evenly around the opening 1c at substantially 120 ° angular intervals. Moreover, the three vertexes (most protruding parts) on the front side in the optical axis direction form a plane perpendicular to the optical axis and are held so as to protrude from the front end face 1b. The first ball group holding section 3 is provided integrally with the support frame 1. Reference numeral 3a denotes a reference plane perpendicular to the optical axis (see FIG. 2), which is formed at the back of the first ball group holding portion 3 so as to make sure contact with the first ball group 2. In this embodiment, since the three first ball groups 2 have the same diameter, the three reference planes 3a are located in the same plane. If the ball diameter is different,
Each reference plane 3a forms a plurality of different planes.

Reference numeral 4 denotes a plate-like guide member, which has an opening 4a at the center for allowing a photographic light beam to pass therethrough, and a first groove 5 at a position facing the first ball group 2 on a back surface 4b. A plane 5a (see FIG. 2) is provided extending in the yaw direction y as long as it is sufficient with a sufficient amount, and is securely in contact with the first ball group 2 and is parallel to and opposed to the reference plane 3a. . Then, the groove width dimension of the first groove portion 5 is set so that the gap with the first ball group 2 is minimized.
The ball group 2 is configured to guide the guide member 4 in the yaw direction y along the first groove 5. The space between the support frame 1 in which the first ball group 2 exists and the guide member 4 is referred to as a first space.

In this embodiment, the vertices (most protruding portions) on the front side in the optical axis direction of the three first ball groups 2 form a plane perpendicular to the optical axis, so that the planes 5a are the same. It is a plane. If the vertices on the front side in the optical axis direction of the three first ball groups 2 do not form a plane perpendicular to the optical axis and the vertices on the front side in the optical axis direction are different, the plane 5a is There are a plurality of different planes perpendicular to the optical axis corresponding to the vertex positions on the front side in the optical axis direction.

Reference numeral 6 denotes three supporting second balls (steel balls).
(Hereinafter referred to as a second ball group), 7 is a second ball group holding portion, which is capable of rotating three second ball groups 6 substantially uniformly around the opening 4a at an angular interval of about 120 °. In this state, the three vertices (the most protruding parts) on the front side in the optical axis direction form a plane perpendicular to the optical axis, and are held so as to protrude from the front end surface 4c of the guide member 4. The second ball group holding portion 7 is provided integrally with the guide member 4. Reference numeral 7a denotes a plane perpendicular to the optical axis (see FIG. 2), which is parallel to the reference plane 3a and is formed at the back of the second ball group holding portion 7 so as to make sure contact with the second ball group 6. In this embodiment, since the diameters of the three second ball groups 6 are equal, the three planes 7a are located in the same plane. If the ball diameters are different, each plane 7a forms a different plurality of planes.

Reference numeral 8 denotes a movable frame, which has an opening 8a at the center for holding a correction lens 9, and a second ball group 6 on the back surface 8b.
A second groove portion 10 is provided at a position opposed to the second groove portion 10 so as to extend in the pitch direction p as long as a predetermined shift amount is sufficient.
A flat surface 10a that is securely in contact with the second ball group 6 at the back thereof, is parallel to the plane 7a (parallel to the reference plane 3a), and faces the same.
(See FIG. 2). Then, the second groove 1
The groove width dimension of 0 is set so that the gap between the second ball group 6 and the second ball group 6 is minimized.
Is configured to guide the movable frame 8 in the pitch direction p along. The space between the movable member 8 and the guide member 4 where the second ball group 6 exists is referred to as a second space.

In this embodiment, since the apexes (most protruding portions) on the front side in the optical axis direction of the three balls form a plane perpendicular to the optical axis, the plane 10a is the same plane. If the vertices on the front side in the optical axis direction of the three second ball groups 6 do not form a plane perpendicular to the optical axis and the vertices on the front side in the optical axis direction are different, the plane 10a is There are a plurality of different planes perpendicular to the optical axis corresponding to the vertex positions on the front side in the optical axis direction.

11p is a pitch magnet, 12p is a pitch yoke, and both 11p and 12p are fixed to the upper central recess 1p of the support frame 1. A pitch coil 13p is fixed to the center of the upper end of the movable frame 8. 11y is a yaw magnet, 12y is a yaw yoke, and both 11y and 12y are fixed to the lateral center concave portion 1y of the support frame 1. 13y
Is a yaw coil, which is fixed to the center of the lateral end of the movable frame 8. Reference numeral 14 denotes a front yoke, which is formed of one component for pitch and yaw.

The coils 13p and 13y have a slight air gap between the magnets 11p and 11y and the yoke 14, are placed in a magnetic circuit formed by the magnet and the yoke, and apply a current to the coil 13p. The movable frame 8 is driven in the pitch direction by flowing the current, and the movable frame 8 is driven in the yaw direction by supplying a current to the coil 13y.

The movable frame 8 has a pitch slit 15p.
And a yaw slit 15y, and a light emitting element (infrared light emitting diode (IRED)) and a light receiving element (semiconductor position detecting element (PSD)) (not shown) are provided corresponding to the pitch slit and the yaw slit, respectively. Based on these relationships, the positions of the movable frame 8 in the pitch direction and the yaw direction are detected. 8c is the front surface 8d of the movable frame 8
The ball receiving surfaces formed at three places protruding slightly from the front surface 8d to form a smooth surface perpendicular to the optical axis (parallel to the reference plane 3a) in contact with the holding ball group 16 (steel balls). And
Within the lens shift range, a contact range with the holding ball group 16 (in FIG. 1, one of the three balls is not shown because it is hidden behind a component) is formed with a margin.

Reference numeral 17 denotes a plate-shaped ball holding portion (a so-called retainer).
In the center, the opening 17a through which the photographing light beam passes, and three pressing ball groups 16 can be rotated substantially uniformly around the opening 17a at an angular interval of about 120 °, and the center of the pressing ball group 16 And a hole 17b (in FIG. 1, one of the three is not shown because it is hidden behind a component) and a fixing arm 17c. The front vertex (most protruding portion) and the rear vertex (most protruding portion) of the three holding ball groups 16 in the optical axis direction form a plane perpendicular to the optical axis, and have a plate-like shape. Ball holder 1
7 project from the front side and the rear side. In this embodiment, the diameters of the three holding ball groups 16 are made equal.

An elastic member 18 is a leaf spring.
An opening 18a through which the photographing light beam passes is provided at the center, and a fixing arm 18b is provided around the opening 18a at substantially equal angular intervals of about 120 °. The elastic member 18 comes into contact with the three holding ball groups 16 on the back surface 18c thereof, and the correction lens 9 mounted on the movable frame 8 so as not to cause a remarkable load when the movable frame 8 is shifted. And coil 1
Movable frame unit 8u including 3p, 13y, etc. and guide member 4
And the ball group is overcome with the added weight, and is pressed in the optical axis direction with a minimum force capable of pressing them. Reference numeral 19 denotes a pressing force adjusting washer which changes the distance between the plate-shaped ball holding portion 17 and the elastic member 18 in order to adjust the pressing force of the elastic member 18 and makes contact with the pressing ball group 16 of the elastic member 18 for displacement. It is used to adjust the amount to be applied.

The front yoke 14, the plate-shaped ball holder 17,
The elastic member 18 and the pressing force adjusting washer 19 are respectively fixed by three screws 20 to respective mounting holes 14a (one of the three is hidden behind the part, not shown), 17d, 1
8d and the hole of the washer 19 itself are penetrated and screwed into the three female screw bosses 1d of the support frame 1 to be fixed to the support frame 1. 21 is an optical axis.

As described above, the movable frame unit 8u can move independently in the pitch direction and the yaw direction, and can freely move to a position obtained by combining the pitch direction and the yaw direction within a predetermined shift range.

In the above configuration, when the drive target signal of the yaw direction component is given, the yaw coil 13y is energized to generate an electromagnetic force in the yaw direction. At this time, the second ball group 6 is pushed against the side surface of the second groove section 10, and the guide member 4 is guided by the first groove section 5 engaging with the first ball group 2 and is driven in the yaw direction. The movable frame unit 8u shifts in the yaw direction by a predetermined amount. When a pitch direction component drive target signal is given, the pitch coil 13p is energized to generate an electromagnetic force in the pitch direction. At this time, the movable frame unit 8u has its own second groove 1 engaging with the second ball group 6.
0, the guide member 4 moves in the pitch direction with respect to the guide member 4, and the side surface of the first groove portion 5 of the guide member 4 pushes the first ball group 2, but is fixed in the pitch direction.
As a result, the movable frame unit 8u shifts in the pitch direction by a predetermined amount.

Therefore, when the drive target signal is given to the position obtained by combining the pitch direction and the yaw direction, the pitch coil 1
3p and the yaw coil 13y are respectively energized, and the movable frame unit 8u is shifted in a predetermined direction by the electromagnetic force. The movable frame unit 8u is associated with a light emitting element (not shown) (infrared light emitting diode (IRED)) corresponding to the pitch slit 15p and the yaw slit 15y and a light receiving element (semiconductor position detecting element (PSD)) not shown. Is detected in the pitch direction and the yaw direction, and this position detection signal is fed back to the drive target signal indicating whether the movable frame unit 8u has shifted to the target position. By such feedback control, the movable frame unit 8u can move to a desired position. Shifted to position.

The movable frame unit 8u moves a ball group (steel balls) with respect to a reference plane 3a provided on the support frame 1 and perpendicular to the optical axis.
The elastic member 18 is supported in parallel without any play in the optical axis direction by an appropriate pressing force of the elastic member 18 in the optical axis direction via the guide members 4 and 6, and shifts on a plane perpendicular to the optical axis. Therefore, deterioration of the optical performance due to tilting with respect to the optical axis or play in the optical axis direction is unlikely to occur. In addition, since the rolling friction of the ball (steel ball), which has extremely low resistance compared with the frictional resistance caused by the sliding of the shaft and the bearing, is used, the shift driving force by the electromagnetic drive can be reduced. Further, since the rotation of the movable frame 8 around the optical axis is prevented by the guide member 4 without using the restoring force of the spring member, the load from the spring member during shifting is not applied to the movable frame unit 8u. Therefore, it is convenient to reduce the shift driving force by the electromagnetic driving.

In the first embodiment, the first ball group holding portion 3 is provided on the support frame 1 side, and the first groove portion 5 is provided on the guide member 4.
, The second ball group holding portion 7 is provided on the guide member 4 side,
The second groove 10 is provided on the movable frame 8 side.
The ball group holding portion 3 is on the guide member 4 side, the first groove portion 5 is on the support frame 1 side, the second ball group holding portion 7 is on the movable frame 8 side, and the second groove portion 10 is on the guide member 4 side. May be provided.

Although the driving resistance may increase somewhat, a ball projection corresponding to the pressing ball group 16 is integrally provided on the elastic member 18 so that the pressing ball group 16 and the plate-like ball holding portion 17 are formed. With the configuration that eliminates this, it is possible to reduce costs.

(Second Embodiment) FIG. 4 is an exploded perspective view of a lens shift device according to a second embodiment of the present invention, and FIG. 5 is a sectional view of the lens shift device of FIG. (Corresponding to a BB cross section cut along the dotted chain line).
The schematic configuration of the vibration isolation system is the same as that of FIG.

In FIGS. 4 and 5, the same parts as those in the first embodiment shown in FIGS. 1 and 2 are denoted by reference numerals obtained by adding 100 to the reference numerals in FIGS.

The shift mechanism of the correction lens in FIGS. 4 and 5 will be described.

A support frame 101 has a cylindrical outer peripheral surface 101a fitted to a lens barrel (not shown) and is supported so as to be movable only in the optical axis direction. Reference numeral 101b denotes a front end surface of the support frame 101, and an opening 101 through which a photographing light beam passes is provided at the center thereof.
c is provided. Reference numeral 102 denotes three first balls (steel balls) for support (hereinafter, referred to as a first ball group), 103
Denotes a first ball group holding portion, and the first ball group 102 is substantially uniformly distributed around the opening 101c at an angular interval of about 120 °.
Are rotatable three times, and the balls are formed at two points in the cross section such that the front apex (most protruding portion) of the three balls in the optical axis direction forms a plane perpendicular to the optical axis and protrudes from the front end face 101b. (See FIG. 5), and holds the ball in a V-shaped cross-sectional shape capable of regulating the position of the ball in the optical axis direction and the direction perpendicular to the optical axis at the corresponding contact point. The first ball group holding portion 103 has the same shape at all three locations and is provided integrally with the support frame 101. In this embodiment, the three first ball groups 102 have the same diameter.

Numeral 104 denotes a plate-shaped guide member having an opening 104a at the center thereof through which a photographing light beam passes, and abutment against the ball at two points in cross section at a position opposite to the first ball group 102 on the back surface 104b. The first groove 105 (see also FIG. 5) having a V-shaped cross-sectional shape capable of regulating the position of the ball in the optical axis direction and the direction perpendicular to the optical axis at the corresponding contact point is the same at all three locations. The first ball group 102 extends along the first groove group 105 along the first groove 105 to extend the guide member 104 with respect to the optical axis. And is configured to guide in the yaw direction y in a vertical plane.
Note that a space between the support frame 101 in which the first ball group 102 exists and the guide member 104 is referred to as a first space.

Reference numeral 106 denotes three supporting second balls (steel balls) (hereinafter referred to as a second ball group), and 107 denotes a second ball group holding portion, which is approximately 120 around the opening 104a. °
The three second ball groups 106 can be rotated approximately evenly at an angular interval of, and the apexes (most protruding portions) of the three balls on the front side in the optical axis direction form a plane perpendicular to the optical axis. Similar to the first ball group holding portion 103, the ball 104 comes into contact with the ball at two points in the cross section so as to protrude from the front end surface 104c of the member 104, and the corresponding contact points in the optical axis direction with respect to the ball and the direction perpendicular to the optical axis. The ball is held in a V-shaped cross-sectional shape capable of regulating the position in two directions. The second ball group holding portion 107 has the same shape at all three locations, and
And are provided integrally. In this embodiment, the diameters of the three second ball groups 106 are made equal.

Reference numeral 108 denotes a movable frame.
9 and an opening 108a for holding the first groove 10 at a position facing the second ball group 106 on the back surface 108b.
Similarly to 5, the second section has a V-shaped cross-sectional shape that abuts the ball at two points in the cross section and that can control the position of the ball in two directions, the optical axis direction and the direction perpendicular to the optical axis, at the corresponding contact point.
Are formed integrally with the movable frame 108 so as to extend in the pitch direction p as long as a predetermined amount of shift is sufficient and have the same shape at all three locations, and the second ball group 106
The movable frame 108 is configured to be guided in the pitch direction p in a plane perpendicular to the optical axis along the groove 110. The guide member 10 in which the second ball group 106 exists
The space between the movable frame 4 and the movable frame 108 is referred to as a second space.

Reference numeral 111p denotes a pitch magnet, 112p denotes a pitch yoke, and both 111p and 112p support frame 101.
Is fixed to the upper central concave portion 101p. A pitch coil 113p is fixed to the center of the upper end of the movable frame 108. 111y is a yaw magnet, 112y is a yaw yoke, and both 111y and 112y are fixed to the lateral center concave portion 101y of the support frame 101. Reference numeral 113y denotes a yaw coil, which is fixed to the center of the lateral end of the movable frame 108. 11
Reference numeral 4 denotes a front yoke, which is formed of one component for pitch and yaw.

The coils 113p and 113y have a slight air gap between the magnets 111p and 111y and the yoke 114, are placed in a magnetic circuit formed by the magnet and the yoke, and apply a current to the coil 113p. The movable frame 108 is driven in the pitch direction by flowing the current, and the movable frame 108 is driven in the yaw direction by flowing the current through the coil 113y.

The movable frame 108 has a pitch slit 1
15p and a yaw slit 115y are provided, and a light emitting element (not shown) (infrared light emitting diode (IRED)) and a light receiving element (not shown) (semiconductor position detecting element (PSD)) are provided corresponding to the pitch slit and the yaw slit, respectively. The positions of the movable frame 108 in the pitch direction and the yaw direction are detected based on these relationships. A ball receiving surface 108c is formed at three places on the front surface 108d side of the movable frame 108 so as to slightly protrude from the front surface 108d.
6 (steel ball) and a plane perpendicular to the optical axis. The holding ball group 116 (in FIG. 4, one of the three balls is hidden behind the part in the shift range of the lens). (Not shown) is formed with a margin.

Reference numeral 117 denotes a plate-shaped ball holding portion (a so-called retainer), and an opening portion 117a through which a photographing light beam passes is provided at the center.
And a position where three pressing ball groups 116 can be rotated substantially evenly around the opening 117a at an angular interval of about 120 ° and the plane including the center of the pressing ball group 116 and perpendicular to the optical axis. The hole 117b (in FIG. 4, one of the three is not shown because it is hidden behind a component), a fixing arm 117c, and a group of three holding balls The front vertex (most protruding portion) and rear vertex (most protruding portion) of the optical axis 116 form a plane perpendicular to the optical axis, and protrude from the front side and the rear side of the plate-shaped ball holding portion 117. It has become. In this embodiment, the diameters of the three holding ball groups 116 are made equal.

Numeral 118 denotes an elastic member which is a leaf spring, which has an opening 118a at the center for transmitting a photographing light beam, and an arm for fixing substantially uniformly around the opening 118a at an angular interval of about 120 °. 118b. The elastic member 118 has three backing ball groups 1 on its back surface 118c.
The movable frame unit 108u including the correction lens 109, the coils 113p, 113y, and the like mounted on the movable frame 108 and the guide member 104 so that the movable frame 108 does not become a significant load when the movable frame 108 is shifted and driven. And the ball group is overcome with the added weight, and is pressed in the optical axis direction with a minimum force capable of pressing them. Reference numeral 119 denotes a pressing force adjusting washer which changes the distance between the plate-shaped ball holding portion 117 and the elastic member 118 in order to adjust the pressing force of the elastic member 118 and makes contact with the pressing ball group 116 of the elastic member 118 to displace. It is used to adjust the amount to be applied.

Front yoke 114, plate-shaped ball holding section 11
7. The elastic member 118 and the pressing force adjusting washer 119
Three mounting holes 114a are provided by three screws 120.
(In FIG. 4, one of the three is not shown because it is hidden behind the part.) 117d, 118d and washer 1
19 is fixed to the support frame 101 by penetrating the holes of the 19 itself and screwing into the three female screw bosses 101 d of the support frame 101. 121 is an optical axis.

As described above, the movable frame unit 108u can move independently in the pitch direction and the yaw direction, and can freely move to a position obtained by combining the pitch direction and the yaw direction within a predetermined shift range.

In the above configuration, when the drive target signal of the yaw direction component is given, the yaw coil 113y is energized to generate an electromagnetic force in the yaw direction. At this time, the second groove 11
The second ball group 106 is formed on the V-groove forming surface corresponding to the
Is pushed, the guide member 104 is guided by the first groove portion 105 engaging with the first ball group 102, and is driven in the yaw direction. As a result, the movable frame unit 108u shifts in the yaw direction by a predetermined amount. When a drive target signal having a pitch direction component is given, the pitch coil 113p is energized to generate an electromagnetic force in the pitch direction. At that time, the movable frame unit 1
08u is guided by its own second groove 110 which engages with the second ball group 106, moves in the pitch direction with respect to the guide member 104, and the guide member 104 is moved by its own first groove 10
5 are formed on the first ball group 102.
Is pressed, but is fixed in the pitch direction. As a result, the movable frame unit 108u shifts in the pitch direction by a predetermined amount.

Therefore, when the drive target signal is given to the position obtained by combining the pitch direction and the yaw direction, the pitch coil 1
13p and the yaw coil 113y are respectively energized, and the movable frame unit 108u is shifted in a predetermined direction by an electromagnetic force. Then, the pitch slit 115p and the yaw slit 1
15y, the light emitting element (infrared light emitting diode (IRED)) and the light receiving element (semiconductor position detecting element (PSD)) not shown relate to the pitch and yaw directions of the movable frame unit 108u. Position detection is performed, and this position detection signal is moved to the target position by the movable frame unit 10.
8u is shifted back to the drive target signal indicating whether or not the movable frame 108 has shifted.
u is shifted to the desired position.

The movable frame unit 108u moves in the optical axis direction of the elastic member 118 via the ball groups (steel balls) 102 and 106 and the guide member 104 with respect to the first ball group holding portion 103 provided on the support frame 101. Is supported in parallel with no play in the optical axis direction by an appropriate pressing force, and shifts on a plane perpendicular to the optical axis. Therefore, deterioration of the optical performance due to tilting with respect to the optical axis or play in the optical axis direction is unlikely to occur. In addition, since the rolling friction of the ball (steel ball), which has extremely low resistance compared with the frictional resistance caused by the sliding of the shaft and the bearing, is used, the shift driving force by the electromagnetic drive can be reduced. Further, since the rotation of the movable frame 108 around the optical axis is prevented by the guide member 104 without using the restoring force of the spring member, the load from the spring member during the shift is reduced by the movable frame unit 1.
08u does not participate. Therefore, it is convenient to reduce the shift driving force by the electromagnetic driving.

Further, since all of the ball group holding portions and the groove portions are formed in a V-shaped cross-section so that there is no backlash in contact with each ball group, the pitch and pitch in the first embodiment are reduced. There is no fitting backlash between the ball and the holding portion / groove portion that occurs in the yaw direction, and a more accurate correction lens shift position control that enables fine driving can be performed.

In the second embodiment, the first ball group holding portion 103 is placed on the support frame 101 side and the first groove portion 105
Is provided on the guide member 104 side, and the second ball group holding portion 10
7 to the guide member 104 side and the second groove 110 to the movable frame 1
08, but on the contrary, the first ball group holding portion 10
3 on the guide member 104 side, and the first groove 105 on the support frame 1.
01, the second ball group holding unit 107 is
The second groove 110 may be provided on the guide member 104 side.

Although the driving resistance may increase somewhat, a ball projection corresponding to the pressing ball group 116 is provided integrally with the elastic member 118, and the pressing ball group 116 and the plate-shaped ball holding portion 117 are formed. With the configuration that eliminates this, it is possible to reduce costs.

(Third Embodiment) FIG. 6 is an exploded perspective view of a lens shift device according to a third embodiment of the present invention, and FIG. 7 is a sectional view of the lens shift device of FIG. This corresponds to a C-C cross section cut along the dotted line). The schematic configuration of the vibration isolation system is the same as that in FIG.

In FIGS. 6 and 7, the same parts as those in the first embodiment shown in FIGS. 1 and 2 are indicated by reference numerals obtained by adding 200 to the reference numerals in FIGS.

The shift mechanism of the correction lens in FIGS. 6 and 7 will be described.

A supporting frame 201 has a cylindrical outer peripheral surface 201a fitted to a lens barrel (not shown) and is supported so as to be movable only in the optical axis direction. Reference numeral 201b denotes a front end face of the support frame 201, and an opening 201 through which a photographing light beam passes is provided at the center thereof.
c is provided. Reference numeral 202 denotes three supporting first balls (steel balls) (hereinafter, referred to as a first ball group);
Denotes a first ball group holding member provided on the front end face 201b of the support frame. The first ball group holding member 203 integrally formed with the first ball group holding member 203 is a first ball group holding portion, which is made of a material harder than the support frame 201 and has an angular interval of about 120 ° around the opening 201c. The first ball group 202 can be rotated approximately three times evenly, and the vertices (most protruding parts) on the front side in the optical axis direction of the three balls form a plane perpendicular to the optical axis. A V-shaped cross-sectional shape that makes contact with the ball at two points in the cross section so as to protrude (see FIG. 7) and that can control the position of the ball in the optical axis direction and the direction perpendicular to the optical axis at the corresponding contact point. Hold the ball. Then, the first ball group holding portion 203a
Are provided in the same shape at all three positions as shown in FIGS. In this embodiment, three first ball groups 2
02 have the same diameter.

Reference numeral 204 denotes a plate-like guide member having an opening 204a at the center thereof through which a photographing light beam passes, a first groove member 205 (see also FIG. 7) on the back surface 204b, and a first ball group 202. It has a V-shaped cross-sectional shape that abuts the ball at two points in the cross section at a position opposite to the position and that can regulate the position of the ball in two directions, the optical axis direction and the direction perpendicular to the optical axis, at the corresponding contact point. A first groove 205a made of a material harder than the member 204 is provided. The first groove portion 205a has the same shape at all three positions, extends in the yaw direction y as long as the predetermined shift amount is sufficient, and is provided integrally with the first groove member 205. The guide member 204 is configured to be guided in the yaw direction y in a plane perpendicular to the optical axis along the first groove 205a. The support frame 201 on which the first ball group 202 exists
The space between the and the guide member 204 is referred to as a first space.

Reference numeral 206 denotes three second balls (steel balls) for supporting (hereinafter, referred to as a second ball group), and 207 denotes a second ball group holding member provided on the front end surface 204c of the guide member. 207a integrally formed with the member is a second ball group holding portion made of a material harder than the guide member 204, and the second ball group holding portion 207a is substantially evenly spaced around the opening 204a at an angular interval of about 120 °. The three ball groups 206 are rotatable, and the apexes (most protruding portions) of the three balls on the front side in the optical axis direction form a plane perpendicular to the optical axis and protrude from the front end surface 204c of the guide member 204. The first ball group holding unit 2
Similar to 03a, it touches the ball at two points in the cross section,
The ball is held in a V-shaped cross-sectional shape capable of regulating the position of the ball in two directions, the optical axis direction and the direction perpendicular to the optical axis, at the corresponding contact point. Then, the second ball group holding unit 20
7a (see FIG. 7) are provided in the same shape at all three locations. In this embodiment, three second ball groups 206
Have the same diameter.

Reference numeral 208 denotes a movable frame.
9, the second groove member 210 is provided on the back surface 208b, and the ball is formed at two points in the cross section in the same position as the first groove 205a at a position facing the second ball group 206. A second groove 210a made of a material harder than the movable frame 208 has a V-shaped cross-sectional shape capable of regulating the position of the ball in the optical axis direction and the direction perpendicular to the optical axis at the corresponding contact point. Have. This second groove 2
10a has the same shape at all three positions and extends in the pitch direction p as long as a predetermined shift amount is sufficient, and the second groove member 2
10, the second ball group 206 is configured to guide the movable frame 208 along the second groove 210a in the plane perpendicular to the optical axis in the pitch direction p. The space between the guide member 204 in which the second ball group 206 exists and the movable frame 208 is referred to as a second space.

Reference numeral 211p denotes a pitch magnet, 212p denotes a pitch yoke, and both 211p and 212p support frame 201.
Is fixed to the upper central concave portion 201p. A pitch coil 213p is fixed to the center of the upper end of the movable frame 208. 211y is a yaw magnet, 212y is a yaw yoke, and both 211y and 212y are fixed to the lateral central recess 201y of the support frame 201. A yaw coil 213y is fixed to the center of the horizontal end of the movable frame 208. 2
Reference numeral 14 denotes a front yoke, which is composed of one component for pitch and yaw.

The coils 213p and 213y have a slight air gap between the magnets 211p and 211y and the yoke 214, are placed in a magnetic circuit formed by the magnet and the yoke, and apply a current to the coil 213p. By flowing, the movable frame 208 is driven in the pitch direction,
By supplying a current to the coil 213y, the movable frame 208 is driven in the yaw direction.

The movable frame 208 has a pitch slit 2
15p and a yaw slit 215y are provided, and a light emitting element (not shown) (infrared light emitting diode (IRED)) and a light receiving element (not shown) (semiconductor position detecting element (PSD)) are provided corresponding to the pitch slit and the yaw slit, respectively. Based on these relationships, the position of the movable frame 208 in the pitch direction and the yaw direction is detected. 208c is a ball receiving surface formed at three places protruding slightly from 208d on the front surface 208d side of the movable frame 208 and forming a smooth and perpendicular surface to the optical axis in contact with the holding ball group 216 (steel balls). Within the lens shift range, the holding ball group 216 (in FIG. 6,
One of the three parts is formed with a margin in contact with a part (not shown) because it is hidden behind the part.

Reference numeral 217 denotes a plate-shaped ball holding portion (a so-called retainer), and an opening 217a through which a photographing light beam passes is provided at the center.
Also, a position in which three pressing ball groups 216 can be rotated substantially uniformly around the opening 217a at an angular interval of about 120 °, and a plane including the center of the pressing ball group 216 and perpendicular to the optical axis. 6 has a hole 217b (in FIG. 6, one of the three is not shown because it is hidden behind a part) and a fixing arm 217c, and has three holding ball groups 216. The vertex on the front side in the optical axis direction (most protruding portion) and the vertex on the rear side (most protruding portion) form a plane perpendicular to the optical axis, and protrude from the front side and the rear side of the plate-shaped ball holding portion 217. It has become. In this embodiment, the diameters of the three holding ball groups 216 are made equal.

An elastic member 218, which is a leaf spring, has an opening 218a at the center for transmitting a photographing light beam, and a substantially uniform fixing arm around the opening 218a at an angular interval of about 120 °. 218b. The elastic member 218 has three pressing ball groups 2 on its back surface 218c.
The movable frame unit 208u including the correction lens 209 and the coils 213p and 213y mounted on the movable frame 208 and the guide member 204 so that the movable frame 208 does not become a significant load when the movable frame 208 is shifted and driven. And the ball group is overcome with the added weight, and is pressed in the optical axis direction with a minimum force capable of pressing them. Reference numeral 219 denotes a pressing force adjusting washer which changes the distance between the plate-shaped ball holding portion 217 and the elastic member 218 in order to adjust the pressing force of the elastic member 218 and makes contact with the pressing ball group 216 of the elastic member 218 for displacement. It is used to adjust the amount to be applied.

Front yoke 214, plate-shaped ball holding section 21
7, the elastic member 218 and the pressing force adjusting washer 219 are respectively provided with three screws 220 for each mounting hole 214a (in FIG. 6, one of the three is not shown because it is hidden behind the part), 217d, 218d And washer 219
It is fixed to the support frame 201 by penetrating its own hole and screwing it into the three female screw bosses 201d of the support frame 201. 221 is an optical axis.

As described above, the movable frame unit 208u can move independently in the pitch direction and the yaw direction, and can freely move to a position obtained by combining the pitch direction and the yaw direction within a predetermined shift range.

In the above configuration, when the drive target signal of the yaw direction component is given, the yaw coil 213y is energized to generate an electromagnetic force in the yaw direction. At this time, the second groove 21
The second ball group 20 is formed on the V-groove forming surface corresponding to the side surface of the second ball group 20a.
6, the guide member 204 is guided by the first groove portion 205a engaged with the first ball group 202 and is driven in the yaw direction. As a result, the movable frame unit 208u shifts by a predetermined amount in the yaw direction. When a drive target signal having a pitch direction component is given, the pitch coil 213p is energized to generate an electromagnetic force in the pitch direction. At that time, the movable frame unit 2
08u is guided by its own second groove 210a engaged with the second ball group 206 and moves in the pitch direction with respect to the guide member 204, and the guide member 204 is moved by its own first groove 20a.
The V groove forming surface corresponding to the side surface of the first ball group 20a
2 is pressed but is fixed in the pitch direction, and as a result, the movable frame unit 208u shifts in the pitch direction by a predetermined amount.

Therefore, when the drive target signal is given to the position obtained by combining the pitch direction and the yaw direction, the pitch coil 21
3p and the yaw coil 213y are respectively energized, and the movable frame unit 208u is shifted in a predetermined direction by the electromagnetic force. And pitch slit 215p and yaw slit 2
The position of the movable frame unit 208u in the pitch direction and the yaw direction is related to the relationship between a light emitting element (infrared light emitting diode (IRED)) (not shown) and a light receiving element (semiconductor position detecting element (PSD)) not shown corresponding to each of the movable frame units 208u. Detection is performed, and the position detection signal is moved to the target position by the movable frame unit 20.
8u is shifted back to the drive target signal indicating whether or not the movable frame 208 has shifted.
u is shifted to the desired position.

The movable frame unit 208u moves in the optical axis direction of the elastic member 218 via the ball groups (steel balls) 202 and 206 and the guide member 204 with respect to the first ball group holding portion 203a provided on the support frame 201. Is supported in parallel with no play in the optical axis direction by an appropriate pressing force, and shifts on a plane perpendicular to the optical axis. Therefore, deterioration of the optical performance due to tilting with respect to the optical axis or play in the optical axis direction is unlikely to occur. In addition, since the rolling friction of the ball (steel ball), which has extremely low resistance compared with the frictional resistance caused by the sliding of the shaft and the bearing, is used, the shift driving force by the electromagnetic drive can be reduced.
Also, the guide member 204 is used without using the restoring force of the spring member.
Prevents the movable frame 208 from rotating around the optical axis, so that the load from the spring member during shifting is reduced by the movable frame unit 2.
08u does not participate. Therefore, it is convenient to reduce the shift driving force by the electromagnetic driving.

Further, since all of the ball group holding portions and the groove portions have a V-shaped cross-sectional shape so as to prevent backlash in contact with each ball group, the pitch and yaw in the first embodiment are not changed. There is no play between the ball and the holding portion / groove generated in the direction, and a more accurate correction lens shift position control, which enables a fine drive, becomes possible.

If such a highly accurate correction lens shift position control is not required, a rectangular cross-section in a fitted state with a very small gap capable of rotating the ball group as in the first embodiment described above. The ball group holding portion and the groove may be formed in a shape. That is, in order to increase the strength (hardness) of the first and second ball group holding portions 3 and 7 and the first and second groove portions 5 and 10 in FIG. It may be made of a material harder than the member 4.

The characteristic feature of the third embodiment is that the strength (hardness) of the ball group holding portion and the groove portion in contact with each ball group is increased to prevent deformation of the ball group holding portion and the groove portion due to external force such as impact. An object of the present invention is to enable highly reliable and highly accurate shift position control by improving wear resistance.

In the third embodiment, the first ball group holding portion 203a is placed on the support
5a is provided on the guide member 204 side, the second ball group holding portion 207a is provided on the guide member 204 side, and the second groove portion 210a is provided on the movable frame 208 side. Conversely, the first ball group holding portion 203a is provided. On the guide member 204 side, the first groove 205
a to the support frame 201 side, the second ball group holding portion 207a
To the movable frame 208 side and the second groove 210a to the guide member 2
It may be provided on the 04 side.

Although the driving resistance may increase somewhat, a ball projection corresponding to the pressing ball group 216 is provided integrally with the elastic member 218, and the pressing ball group 216 and the plate-shaped ball holding section 217 are formed. With the configuration that eliminates this, it is possible to reduce costs.

According to each of the above embodiments, when the movable frame holding the correction lens is supported via the rotatable ball group, the guide member is sandwiched between the movable frame and the support frame. A ball group is caught in a first groove portion provided in one direction and a second groove portion orthogonal to the first groove portion to prevent the rotation of the movable frame around the optical axis in the pitch direction and the yaw direction. The movable frame presses the ball group in the optical axis direction by an elastic member while freely moving in a plane perpendicular to the optical axis.

Thus, with such a simple configuration, the guide member prevents the movable frame from rotating around the optical axis without using the restoring force of the spring member. Since the rolling motion of the small ball group is utilized, the shift driving force of the correction lens supported by the movable frame can be reduced. In addition, since there is no deterioration in optical performance due to tilting of the optical axis or backlash due to the shift, it is possible to cope with a highly accurate correction lens shift position control that can perform minute driving. In addition, if an extremely high-precision correction lens shift position control is not pursued, the drive unit by the electromagnetic force can be reduced, and the shift mechanism can be downsized and energy can be saved. Further, there is an effect of cost reduction by reducing the number of parts by a simple configuration and the number of assembling steps.

Further, the ball group holding portion and the groove are formed in a cross-sectional shape capable of abutting the ball at two points in the cross section and restricting the position of the ball with respect to the corresponding contact point in two directions of the optical axis direction and the direction perpendicular to the optical axis. Therefore, it is possible to eliminate a minute play in the shift plane of the correction lens and to cope with a more accurate correction lens shift position control capable of performing a minute drive.

Further, by increasing the strength (hardness) of the ball group holding portion and the groove portion, preventing deformation of the ball group holding portion and the groove portion due to external force such as impact, and improving wear resistance, in addition to the above effects,
This has the effect of enabling highly reliable and accurate shift position control.

(Correspondence between the Invention and the Embodiment) In the first embodiment, the correction lens 9 is the lens for decentering the optical axis (of the present invention) according to the first aspect, and the support frame 1 is the first aspect. The fixed member described above, the movable frame 8 is the movable member described in claim 1, the guide member 4 is the guide member described in claim 1, and the first ball group 2 is the at least three first balls described in claim 1. The first ball group holding part 3 has the first ball group holding part 3 in the first ball group holding part, and the second ball group 6 has the first ball group holding part 3 in the first ball group holding part. The second ball group holding portion according to claim 1 is provided with a first ball group holding portion.
The groove 5 of the second groove 1 is provided in the groove 1 of the first embodiment.
0 corresponds to the second groove portion of the first aspect, and the leaf spring 18 corresponds to the elastic member of the first aspect.

In the second embodiment, the correction lens 109 is movable to the lens for decentering the optical axis (according to the present invention), and the support frame 101 is movable to the fixed member according to the second aspect. The frame 108 corresponds to the movable member according to claim 2, the guide member 104 corresponds to the guide member according to claim 2, the first ball group 102 corresponds to at least three first balls according to claim 2, The ball group 106 includes at least three second balls according to claim 2 and the first ball group holding portion 10.
3 is the first ball group holding portion according to claim 2, the second ball group holding portion 107 is the second ball group holding portion according to claim 2, and the first groove portion 105 is the claim 2. In the first groove portion, the second groove portion 110 is in the second groove portion according to claim 2,
The leaf springs 118 correspond to the elastic members according to the first aspect, respectively.

In the third embodiment, the correction lens 209 is a lens for decentering the optical axis (according to the present invention) and the support frame 201 is a fixed lens according to the third and fourth aspects. The movable frame 208 is a member, the movable member is a movable member according to the third and fourth aspects, the guide member 204 is a guide member according to the third and fourth aspects, and the first ball group 202 is the third and fourth aspects.
5. The at least three first balls according to claim 3, wherein the second group of balls 206 comprises at least three second balls according to claims 3 and 4.
The first ball group holding portion 203a is provided on the first ball.
The second ball group holding portion 207a is provided in the first ball group holding portion described in claims 3 and 4, and the first groove portion 205a is provided in the second ball group holding portion described in claims 3 and 4. In the first groove portion, the second groove portion 210a corresponds to the second groove portion in the third and fourth aspects, and the leaf spring 218 corresponds to the elastic member in the third and fourth aspects, respectively.

The correspondence between the components of the embodiment and the components of the present invention has been described above. However, the present invention is not limited to the configuration of the embodiment, and the functions and functions described in the claims are not limited.
Needless to say, any configuration may be used as long as the functions of the embodiment can be achieved.

In the above embodiment, the number of the first and second ball groups and the number of the first and second ball group holders are three respectively. However, the number may be more than three.

[0100]

As described above, according to the present invention,
An object of the present invention is to provide a lens shift device that can shift a lens in a direction perpendicular to the optical axis with a simple configuration and with as little drive resistance as possible and without play in the optical axis direction.

Further, according to the present invention, it is possible to provide a lens shift device which enables high-precision shift position control without minute backlash in a shift plane of a lens.

According to the present invention, the deformation of the first and second ball holding portions and the first and second groove portions due to an external force such as an impact and the abrasion resistance are improved, and a highly reliable high precision It is possible to provide a lens shift device capable of performing various shift position controls.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a lens shift device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG. 1 taken along a two-dot chain line.

FIG. 3 is a perspective view showing a schematic configuration of a general anti-vibration system.

FIG. 4 is an exploded perspective view of a lens shift device according to a second embodiment of the present invention.

FIG. 5 is a sectional view taken along the line BB of FIG. 4 taken along the two-dot chain line.

FIG. 6 is an exploded perspective view of a lens shift device according to a third embodiment of the present invention.

FIG. 7 is a cross-sectional view taken along the line CC of FIG. 6;

[Explanation of symbols]

 1, 101, 201 Support frame 2, 102, 202 First ball group (steel ball) 3, 103, 203a First ball group holding section 4, 104, 204 Guide member 5, 105, 205a First groove section 6 , 106, 206 Second ball group 7, 107, 207a Second ball group holding portion 8, 108, 208 Movable frame 9, 109, 209 Correction lens 10, 110, 210a Second groove portion 18, 118, 218 Elasticity Element

Claims (5)

[Claims] 1. A lens that decenters an optical axis, a fixed member, a movable member that holds the lens and is shifted in a plane perpendicular to the optical axis direction, and between the fixed member and the movable member. A guide member provided, at least three first balls sandwiched between the fixed member and a first of the guide members, and at least three first balls sandwiched between a second of the guide member and the movable member. A second ball, a first ball holding portion provided on the fixed member or the guide member for rotatably holding the first ball,
A second ball holding portion provided on the movable member or the guide member for rotatably holding the second ball; and a second ball holding portion of the guide member or the fixed member sandwiching the first ball. A first groove portion provided at a position facing the first ball holding portion, for guiding the movable member in one direction via the guide member, and the second ball of the guide member or the movable member. A second groove for guiding the movable member in one direction orthogonal to the first groove, the second groove being provided at a position facing the second ball holding portion with the first and second ball holding portions interposed therebetween; A lens shift device comprising: an elastic member that generates a pressing force for holding a ball. 2. A lens that decenters an optical axis, a fixed member, a movable member that holds the lens and is shifted in a plane perpendicular to the optical axis direction, and between the fixed member and the movable member. A guide member provided, at least three first balls sandwiched between the fixed member and a first of the guide members, and at least three first balls sandwiched between a second of the guide member and the movable member. A second ball, provided on the fixing member or the guide member so as to rotatably hold the first ball, and having a cross-sectional shape in contact with the first ball at two points; A first ball holding portion having a cross-sectional shape capable of regulating the position of the ball in two directions, an optical axis direction and a direction perpendicular to the optical axis, and the guide for rotatably holding the second ball. Member or said movable part Material, and at two points the second
A second ball holding portion having a cross-sectional shape in contact with the ball, and having a cross-sectional shape capable of restricting the position of the ball in two directions of an optical axis direction and a direction perpendicular to the optical axis at the corresponding contact point; The guide member or the fixed member is provided at a position facing the first ball holding portion with the first ball interposed therebetween, and has a cross-sectional shape that abuts the first ball at two points, and has a corresponding contact. A first shape for guiding the movable member in one direction through the guide member, having a cross-sectional shape capable of restricting the position of the ball in two directions of an optical axis direction and a direction perpendicular to the optical axis. A groove formed in the movable member or the guide member at a position opposed to the second ball holding portion with the second ball interposed therebetween, and having a cross-sectional shape in contact with the second ball at two points. And the ball at the corresponding contact A second groove portion for guiding the movable member in one direction orthogonal to the first groove portion, the second groove portion having a cross-sectional shape capable of restricting the position in two directions of an optical axis direction and a direction perpendicular to the optical axis; And a resilient member for generating a pressing force for clamping the first and second ball groups. 3. A lens that decenters the optical axis, a fixed member, a movable member that holds the lens and is shifted in a plane perpendicular to the optical axis direction, and between the fixed member and the movable member. A guide member provided, at least three first balls sandwiched between the fixed member and a first of the guide members, and at least three first balls sandwiched between a second of the guide member and the movable member. A second ball, a first ball holding portion fixed to the fixing member or the guide member to rotatably hold the first ball, and made of a material harder than the fixing member or the guide member;
A second ball holding portion fixed to the guide member or the movable member so as to rotatably hold the second ball and made of a material harder than the guide member or the movable member; and the guide member or the fixed member. The guide member or the fixed member fixed to a position of the member opposed to the first ball holding portion with the first ball interposed therebetween, for guiding the movable member in one direction via the guide member. A first groove portion made of a material harder than a member, and the movable member or the guide member fixed to a position facing the second ball holding portion with the second ball interposed therebetween; A second member made of a material harder than the movable member or the guide member for guiding the movable member in one direction orthogonal to the second member;
And a resilient member for generating a pressing force for clamping the first and second balls. 4. A lens that decenters the optical axis, a fixed member, a movable member that holds the lens and is shifted in a plane perpendicular to the optical axis direction, and between the fixed member and the movable member. A guide member provided, at least three first balls sandwiched between the fixed member and a first of the guide members, and at least three first balls sandwiched between a second of the guide member and the movable member. A second ball and the first ball are fixed to the fixing member or the guide member so as to rotatably hold the first ball, and have a cross-sectional shape that abuts the first ball at two points. A first ball holding portion made of a material harder than the fixed member or the guide member, the first ball holding portion having a cross-sectional shape capable of restricting the position of the ball in two directions of an optical axis direction and a direction perpendicular to the optical axis; Two balls Is fixed to the guide member or the movable member so as to be rotatable, and the second member is fixed at two points.
The guide member or the movable member has a cross-sectional shape in contact with the ball, and has a cross-sectional shape capable of regulating the position of the ball in the optical axis direction and the direction perpendicular to the optical axis at the corresponding contact point. A second ball holding portion made of a hard material, and the guide member or the fixing member are fixed to positions facing the first ball holding portion with the first ball interposed therebetween, and the first ball holding portion is fixed at two points. Has a cross-sectional shape capable of restricting the position of the ball in two directions of an optical axis direction and a direction perpendicular to the optical axis at the corresponding contact point, and has a cross-sectional shape through the guide member. A first groove made of a material harder than the guide member or the fixed member for guiding the movable member in one direction, and the second groove of the movable member or the guide member sandwiching the second ball; Ball holder The ball is fixed at a position facing the portion and has a cross-sectional shape that abuts the second ball at two points, and furthermore, the corresponding contact points regulate the position of the ball in two directions in the optical axis direction and the direction perpendicular to the optical axis. A second groove made of a material harder than the movable member or the guide member, for guiding the movable member in one direction orthogonal to the first groove, the second groove having a possible cross-sectional shape; And a resilient member for generating a pressing force for holding the second ball. 5. The lens shift device according to claim 1, wherein the guide member has a function of preventing the movable member from rotating around the optical axis.