JP2013003332A - Image blurring correction device and optical instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize downsizing of an image blurring correction device that uses a rolling member to guide a shift of a movable member.SOLUTION: An image blurring correction device comprises: base members 2 and 3; movable members 4 and 5 that hold an optical element 1 and can shift in a first direction Y to the base members; and rolling members 71, 72 and 73 that are arranged between the base members and the movable members in a second direction (optical axis direction) perpendicular to the first direction, and roll in the first direction in association with the shift of the movable members in the first direction. The base member includes a first rolling guide part 31 that contacts the rolling members at a position of first distance rin the second direction from a rotation center O of the rolling member, and the movable member includes a second rolling guide part that contacts the rolling members at a position of second distance rin the second direction from the rotation center of the rolling member. The first distance is greater than the second distance.

Description

  The present invention relates to an image blur correction apparatus suitable for optical equipment such as a video camera, a digital still camera, an interchangeable lens, binoculars, a telescope, and a field scope.

  In order to prevent image deterioration due to camera shake such as camera shake, an image shake correction device (anti-vibration device) that moves (shifts) the lens and image sensor in a direction perpendicular to the optical axis according to camera shake is installed. Optical equipment is known.

  In an image blur correction apparatus, it is necessary to support a movable member that holds a lens and an image sensor so that the movable member can be moved independently in a horizontal direction (hereinafter referred to as a yaw direction) and a vertical direction (hereinafter referred to as a pitch direction).

  In Patent Documents 1 and 2, a guide member is disposed between the base member and the movable member that holds the lens, and a first ball is disposed between the base member and the guide member. An image blur correction device is disclosed in which a second ball is arranged so as to be capable of rolling. In this image blur correction device, the guide member is supported via the first ball so as to be movable only in the yaw direction (or pitch direction) with respect to the base member, and the movable member is supported via the second ball. On the other hand, it is supported to be movable only in the pitch direction (or yaw direction).

Japanese Patent Laid-Open No. 11-007051 JP 2008-185643 A

  However, in the devices disclosed in Patent Documents 1 and 2, it is difficult to reduce the size of the guide member and the movable member, which hinders the size reduction of the entire device. This will be described with reference to FIGS. 12 (a) and 12 (b). In these drawings, 503 is a base member, 506 is a guide member, and 571 is a first ball. Further, in contrast to the guide member 506 shown in parentheses, 505 shown in parentheses is a movable member, and 581 is a second ball.

  As shown in FIG. 12A, the base member 503 and the guide member 506 include a V-shaped groove section (hereinafter referred to as a V-groove section) having two surfaces in contact with the ball 571. By making contact with the ball 571 on the two surfaces of the V-groove, the guide member 506 is guided relative to the base member 503 so as to be movable only in the direction in which the V-groove extends.

  When the guide member 506 is moved with respect to the base member 503, the ball 571 moves the same distance with respect to each of the guide member 506 and the base member 503. Therefore, the length of the V-groove portion provided in the guide member 506 and the base member 503 needs to be at least half the length S of the guide member movement amount S as shown in FIG. For this reason, there is a limit to downsizing the guide member 506. The movable range of the guide member 506 has a size obtained by adding the moving amount S to the length Lm of the guide member 506, and no other parts can be disposed in the movable range. In addition, the same relationship is also established between the guide member 506, the movable member 505, and the second ball 581 disposed between them, and as a result, downsizing of the entire apparatus is limited.

  The present invention provides an image blur correction apparatus that can realize downsizing of the entire apparatus when the movement of a movable member or a guide member is guided using a rolling member such as a ball.

  An image shake correction apparatus according to one aspect of the present invention includes a base member, a movable member that holds an optical element or an imaging element and is movable in a first direction with respect to the base member, and is orthogonal to the first direction. A rolling member is disposed between the base member and the movable member in the second direction and rolls in the first direction as the movable member moves in the first direction. The base member has a first rolling guide portion that comes into contact with the rolling member at a first distance in the second direction from the rotation center of the rolling member. A second rolling guide portion that contacts the rolling member at a second distance in the second direction from the center of rotation; The first distance is larger than the second distance.

  An image shake correction apparatus according to another aspect of the present invention holds a base member and an optical element or an imaging element, and is movable in a first direction including two directions orthogonal to the base member. A movable member, a guide member disposed between the base member and the movable member in a second direction orthogonal to the first direction, and disposed between the base member and the guide member in the second direction, A first rolling member that rolls in one direction as the movable member moves in one of two directions included in one direction, and a base member or a guide member that is movable in the second direction. A second rolling member that is disposed between the second member and the second rolling member that rolls in the other direction as the movable member moves in the other direction of the two directions included in the first direction. The base member has a first rolling guide portion that contacts the first rolling member at a first distance in the second direction from the rotation center of the first rolling member. Has a second rolling guide portion in contact with the first rolling member at a second distance in the second direction from the rotation center of the first rolling member, and is a base member or a guide member Has a third rolling guide portion that comes into contact with the second rolling member at a third distance in the second direction from the rotation center of the second rolling member, and the movable member is It has the 4th rolling guide part which contacts the 2nd rolling member in the position of the 4th distance in the 2nd direction from the rotation center of the 2nd rolling member. And it is characterized in that at least one of the first distance is larger than the second distance and the third distance is different from the fourth distance is satisfied.

  Note that the optical apparatus provided with the image blur correction device also constitutes another aspect of the present invention.

  It is possible to reduce the size of the image blur correction apparatus that uses the rolling member to guide the movement of the movable member and the guide member relative to the base member.

1 is an exploded perspective view of an image blur correction device mounted on a lens apparatus that is Embodiment 1 of the present invention. FIG. 2 is a front view of the image shake correction apparatus. Sectional drawing of the said image blur correction apparatus. FIG. 5 is another cross-sectional view of the image blur correction device. 1 is a diagram illustrating a schematic configuration of a lens apparatus according to Embodiment 1. FIG. The figure explaining the rotation prevention board used for the said image blur correction apparatus. The figure explaining the contact plate used for the said image blur correction apparatus. The figure explaining the motion of the ground plane, the ball | bowl, and guide member which are used for the said image blur correction apparatus. Sectional drawing explaining the rolling member and rolling guide part in Example 2 of this invention. Sectional drawing explaining the rolling member and rolling guide part in Example 3 of this invention. Sectional drawing explaining the rolling member and rolling guide part in Example 4 of this invention. The figure which shows the structure of the conventional image blur correction apparatus.

Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 5 shows an image pickup apparatus as an optical apparatus that is Embodiment 1 of the present invention, and the image pickup apparatus includes an image shake correction device (anti-vibration device). The embodiments of the present invention include various optical devices such as a video camera, a digital still camera, an interchangeable lens, a binocular, a telescope, and a field scope (not shown).

  In FIG. 5, reference numeral 462 denotes a lens barrel portion of the imaging apparatus. Reference numeral 469 denotes an image sensor that photoelectrically converts a subject image formed by the photographing optical system in the lens barrel 462. Reference numeral 401 denotes a correction lens as an optical element that constitutes a part of the photographing optical system.

  An arrow 461p indicates a pitch direction that is a vertical shake (pitch shake) direction, and an arrow 461y indicates a yaw direction that is a lateral shake (yaw shake) direction. The pitch direction and the yaw direction are directions (first directions) orthogonal to the optical axis of the photographing optical system or the correction lens 401, and are two directions orthogonal to each other. In the following description, the direction in which the optical axis of the photographing optical system or the correction lens 401 extends is referred to as the optical axis direction (second direction).

  Reference numerals 463p and 463y denote shake sensors for detecting angular displacements of pitch shake and yaw shake of the imaging apparatus, and the detection directions of the respective angular displacements are indicated by arrows 464p and 464y.

  Reference numerals 465p and 465y denote arithmetic circuits which calculate drive target positions in the pitch direction and yaw direction of the image blur correction device 400 based on signals from the shake sensors 463p and 463y, respectively. Reference numerals 468p and 468y denote shift position detection sensors for detecting the positions of the correction lens 401 in the pitch direction and the yaw direction, respectively. The arithmetic circuits 465p and 465y control energization to the pitch and yaw actuators (drive coils) 467p and 467y so that the detection positions in the pitch direction and the yaw direction by the shift position detection sensors 468p and 468y approach the drive target position. . As a result, the correction lens 401 moves (shifts) in a direction orthogonal to the optical axis, and reduces shake of the subject image on the image sensor 469 due to pitch shake and yaw shake of the image pickup apparatus.

  Next, the configuration of an image shake correction apparatus corresponding to the image shake correction apparatus 400 shown in FIG. 5 will be described in detail with reference to FIGS. FIG. 1 shows an exploded image blur correction device. FIG. 2 shows the assembled image blur correction device as viewed from the front side (for example, the subject side). FIG. 3 shows a cross section of the assembled image shake correction apparatus when cut by a plane including the optical axis (a plane shown as line AA in FIG. 2). In FIG. 1, P indicates the pitch direction, and Y indicates the yaw direction.

  Reference numeral 2 denotes a base plate constituting a part of the base member, and is fixed to the lens barrel portion 462 shown in FIG. An opening for allowing light to pass through is formed in the center of the base plate 2, and ball holding openings, which will be described in detail later, are formed at three locations around the opening (around the optical axis).

  Reference numeral 1 denotes a correction lens, which corresponds to the correction lens 401 shown in FIG. Reference numeral 4 denotes a shift lens barrel 4 as a movable member that holds the correction lens 1. The shift barrel 4 is shiftable (movable) with respect to the base plate 2 in a plane orthogonal to the optical axis, that is, in the pitch direction and the yaw direction. Drive coils 11P and 11Y of a pitch actuator and a yaw actuator are fixed at two positions of the shift barrel 4.

  Reference numeral 3 denotes a first yoke, which is formed of a ferromagnetic material. The first yoke 3 is fixed to the base plate 2 and constitutes a base member together with the base plate 2. The first yoke 3 functions as a yoke portion of the pitch actuator and the yaw actuator, and the drive magnets 12P and 12Y of the pitch actuator and the yaw actuator are attracted and fixed to the two portions by a magnetic force. In addition, first rolling guide portions 31 extending in the yaw direction, which is one of the two directions described above, are formed at two locations of the first yoke 3. As will be described in detail later, the first rolling guide portion 31 guides the first ball so that it can roll in the yaw direction.

  Reference numeral 5 denotes a ball receiving plate, which is formed of a material having high hardness and excellent wear resistance such as stainless steel. The ball receiving plate 5 is fixed to the shift barrel 4. The detailed shape of the ball receiving plate 5 is shown in FIG.

  The ball receiving plate 5 has a portion extending in the pitch direction, a portion extending in the yaw direction, and a portion (connection portion) to which these are connected. In the portion extending in the pitch direction and the portion extending in the yaw direction, two fourth rolling guide portions 51 extending in the pitch direction, which is the other of the two directions described above, are formed. Although these two 4th rolling guide parts 51 are demonstrated in detail later, they guide two 2nd balls so that rolling is possible in a pitch direction. Since the two fourth rolling guide portions 51 are provided in the same component, which is the ball receiving plate 5, the two second balls can be guided with high accuracy in the pitch direction.

  Since the ball receiving plate 5 is fixed to the shift barrel 4, it can be regarded as being integral with the shift barrel 4. For this reason, it may be handled that the movable member is constituted by the shift barrel 4 and the ball receiving plate 5.

  Reference numeral 6 denotes a rotation prevention plate as a guide member, which is formed of a material having high hardness and excellent wear resistance such as stainless steel. The rotation prevention plate 6 is disposed between the ball receiving plate 5 (shift barrel 4) and the main plate 2 in the optical axis direction. The detailed shape of the rotation prevention plate 6 is shown in FIG.

  The rotation prevention plate 6 has a portion extending in the pitch direction, a portion extending in the yaw direction, and a portion (connection portion) to which these are connected. Two second rolling guide portions 61 extending in the yaw direction are formed on the surface on the ground plane 2 side of the portion extending in the pitch direction and the connecting portion. In addition, two third rolling guide portions 62 extending in the pitch direction are formed on the surface on the ball receiving plate 5 side of the portion extending in the pitch direction and the yaw direction. The second rolling guide portion 61, which will be described in detail later, guides the two first balls so as to roll in the yaw direction. The third rolling guide unit 62 guides two second balls so as to roll in the pitch direction, which will be described in detail later.

  Since the two second rolling guide portions 61 and the two third rolling guide portions 62 are provided on the same component, that is, the rotation prevention plate 6, the two first balls and the second balls are respectively attached. It is possible to guide in the yaw direction and pitch direction with high accuracy.

  Reference numerals 71, 72, 73 denote first balls as first rolling members having spherical contact surfaces. The first balls 71, 72, 73 are disposed between the first yoke 3 and the rotation prevention plate 6 in the optical axis direction. The first balls 71 and 73 are in contact with the first rolling guide portion 31 formed on the first yoke 3 and are in contact with the second rolling guide portion 61 formed on the rotation prevention plate 6. Thus, the rotation blocking plate 6 is positioned with respect to the first yoke 3 (that is, the ground plane 2) in the optical axis direction. The first balls 71 and 73 are guided by the first rolling guide portion 31 and the second rolling guide portion 61 as the rotation prevention plate 6 moves (shifts) in the yaw direction with respect to the base plate 2. Roll in the yaw direction.

  The rotation prevention plate 6 is guided by the two first balls 71 and 73 to prevent movement in the pitch direction and movement in the rotation direction. The remaining one first ball 72 rolls in the yaw direction while contacting the flat surface portion of the rotation prevention plate 6 so as to prevent only the movement of the rotation prevention plate 6 in the optical axis direction.

  Reference numerals 81, 82, and 83 denote second balls as second rolling members having a spherical contact surface. The second balls 81, 82, 83 are arranged between the rotation prevention plate 6 and the ball receiving plate 5 in the optical axis direction. The second balls 81 and 83 are in contact with the third rolling guide portion 62 formed on the rotation prevention plate 6 and are in contact with the fourth rolling guide portion 51 formed on the ball receiving plate 5. Thereby, the ball receiving plate 5 (that is, the shift barrel 4) is positioned with respect to the rotation preventing plate 6 in the optical axis direction. Further, the second balls 81 and 83 are moved in the pitch direction with respect to the rotation prevention plate 6 of the ball receiving plate 5 (shift barrel 4) (shift), and the third rolling guide portion 62 and the fourth rolling guide 62 are moved. It rolls in the pitch direction while being guided by the motion guide portion 51.

  The ball receiving plate 5 (shift barrel 4) is guided by the two second balls 81 and 83, so that movement in the yaw direction and movement in the rotational direction are prevented. The remaining one second ball 82 rolls in the pitch direction while contacting the flat portion of the ball receiving plate 5 so as to prevent only the movement of the ball receiving plate 5 (shift barrel 4) in the optical axis direction. To do.

  Reference numerals 91, 92, and 93 denote urging springs as urging members. The urging springs 91, 92, and 93 each have one end fixed to the base plate 2 and the other end fixed to the shift barrel 4, so that the biasing force toward the base plate 2 from the shift barrel 4 in the optical axis direction can be obtained. generate. As a result, the shift barrel 4, the ball receiving plate 5, the second balls 81, 82, 83, the rotation prevention plate 6 and the first balls 71, 72, 73 are directed toward the first yoke 3 and the main plate 2. Press to remove backlash between them.

  In addition to using an elastic member such as an urging spring, the shift barrel 4 may be urged toward the base plate 2 using electrostatic force or magnetic force.

  Reference numeral 10 denotes a second yoke, which is made of a ferromagnetic material. The second yoke 10 is disposed on the opposite side of the base plate 2 with respect to the shift barrel 4 and is fixed to the base plate 2. The second yoke 10 functions as a yoke portion of the pitch actuator and the yaw actuator, and the drive magnets 13P and 13Y of the pitch actuator and the yaw actuator are attracted and fixed to the two portions by a magnetic force.

  As described with reference to FIG. 5, when the drive coils 11P and 11Y of the pitch actuator and yaw actuator are energized, the Lorentz force is applied to the drive coils 11P and 11Y by the magnetic field generated by the drive magnets 12P and 13P and 12Y and 13Y. Works. The Lorentz force becomes a thrust, and the shift barrel 4 is driven to shift in the pitch direction and the yaw direction together with the drive coils 11P and 11Y. The shift drive direction of the shift barrel 4 can be reversed by switching the energization direction to the drive coils 11P and 11Y.

  Next, with reference to FIG. 4, a description will be given of a support structure for each member using the first balls 71, 72, 73 and the second balls 81, 82, 83. FIG. 4 shows a cross section when the image blur correction apparatus is cut along a plane (indicated by a line BB in FIG. 2) passing through the first ball 71 and the second ball 81. First, the relationship between the first yoke 3 fixed to the main plate 2 and the rotation prevention plate 6 will be described.

  The first rolling guide portion 31 provided in the first yoke 3 is formed as a V-shaped groove having a V-shaped cross section perpendicular to the direction in which the first rolling guide portion 31 extends (yaw direction). Thereby, the first ball 71 can roll in the yaw direction with respect to the first yoke 3 while contacting the two inner surfaces of the V-groove at two points. Further, the movement (rolling and sliding) of the first ball 71 in the pitch direction with respect to the first yoke 3 is prevented.

  The second rolling guide portion 61 provided on the rotation prevention plate 6 is formed as a V-groove having a V-shaped cross section perpendicular to the yaw direction in which the second rolling guide portion 61 extends. Accordingly, the first ball 71 can roll in the yaw direction with respect to the rotation prevention plate 6 while contacting the two inner surfaces of the V groove at two points. Further, the movement of the first ball 71 in the pitch direction with respect to the rotation prevention plate 6 is prevented.

  Two first and second rolling guide portions 31 and 61 are provided on each of the first yoke 3 and the rotation prevention plate 6. Therefore, the rotation prevention plate 6 is supported so as to be able to shift only in the yaw direction with respect to the first yoke 3 (base plate 2), and the shift in the pitch direction and the rotation around the optical axis are prevented. .

  Next, the relationship between the rotation prevention plate 6 and the ball receiving plate 5 fixed to the shift barrel 4 will be described.

  The third rolling guide portion 62 provided on the rotation prevention plate 6 is formed as a V-groove having a V-shaped cross section perpendicular to the direction in which the third rolling guide portion 62 extends (pitch direction). Thereby, the second ball 81 can roll in the pitch direction with respect to the rotation prevention plate 6 while contacting the two inner surfaces of the V groove at two points. Further, the movement of the second ball 81 in the yaw direction relative to the rotation prevention plate 6 is prevented.

  The 4th rolling guide part 51 provided in the ball receiving plate 5 is formed as a V-groove whose cross section orthogonal to the pitch direction in which it extends is V-shaped. As a result, the second ball 81 can roll in the pitch direction with respect to the ball receiving plate 5 while being in contact with the two inner surfaces of the V-groove at two points. Further, the movement of the second ball 81 in the pitch direction with respect to the ball receiving plate 5 is prevented.

  Two each of the third and fourth rolling guide portions 62 and 51 are provided on the rotation prevention plate 6 and the ball receiving plate 5, respectively. For this reason, the ball receiving plate 5 (shift barrel 4) is supported so as to be able to shift only in the pitch direction with respect to the rotation preventing plate 6, and the shifting in the yaw direction and the rotation around the optical axis are prevented. The

  Thus, the rotation prevention plate 6 is supported so as to be shiftable in the yaw direction with respect to the base plate 2 (first yoke 3), and the shift lens barrel 4 (ball receiving plate 5) is arranged in the pitch direction with respect to the rotation prevention plate 6. Supported in a shiftable manner. Accordingly, the shift barrel 4 can be supported so as to be shiftable in the yaw direction and the pitch direction with respect to the base plate 2.

  Next, FIG. 8 shows a method for miniaturizing at least one of the second rolling guide portion 61 (that is, the rotation preventing plate 6) and the fourth rolling guide portion 51 (that is, the ball receiving plate 5). It explains using. FIG. 8A shows a first yoke 3 having a first rolling guide portion 31, a first ball 71, and a rotation prevention plate 6 having a second rolling guide portion 61. A cross section when cut along a plane perpendicular to the rolling direction (yaw direction) of the ball 71 is shown.

  The ball receiving plate 5 has the same relationship with the rotation prevention plate 6. For this reason, in the drawing, as shown in parentheses, the ball receiver having the rotation prevention plate 6 having the third rolling guide portion 62, the second ball 81, and the fourth rolling guide portion 51 is shown. A cross section when the plate 5 is cut along a plane orthogonal to the rolling direction (pitch direction) of the second ball 81 is also shown. The same applies to FIG. 8B.

  As shown in FIG. 8A, the first rolling guide portion 31 formed as a V-groove is composed of two surfaces that contact the first ball 71 at two points. The angle formed by these two surfaces is θ1. Similarly, the second rolling guide portion 61 formed as a V-groove is constituted by two surfaces that contact the first ball 71 at two points. The angle formed by these two surfaces is θ2.

As shown in FIG. 8A, the distance (first distance) r in the optical axis direction from the rotation center O of the first ball 71 to the contact point (contact position) of the first rolling guide portion 31. ₁ is that the radius of the first ball 71 is R,
Rcos (θ _1/2)
It becomes.

Further, the distance (second distance) r ₂ in the optical axis direction from the rotation center O of the first ball to the contact point (contact position) of the second rolling guide portion 61 is:
Rcos (θ _2/2)
It becomes.

In this embodiment, θ ₁ is set smaller than θ ₂ . For this reason, the distance r ₁ is larger than the distance r ₂ .

FIG. 8B shows the movement of the first ball 71 and the rotation prevention plate 6 with respect to the first yoke 3. A first ball 71 first yoke 3 (first rolling guide unit 31), since the contact at the position of distance r ₁ in the optical axis direction from the rotation center O of the first ball 71, When the first ball 71 rolls only _once, it moves by 2πr _{1 with} respect to the first yoke 3. The first ball 71 and the rotation preventing plate 6 (second rolling guide unit 61), since the contact at a position a distance r ₂ from the rotational center O in the direction of the optical axis of the first ball 71 When the first ball 71 rolls by one rotation, the first ball 71 moves by 2πr _{2 with} respect to the rotation prevention plate 6.

Since the first ball 71 rolls without sliding with respect to the first yoke 3 and the rotation prevention plate 6, the rotation prevention plate 6 is rotated by one rotation of the first ball 71. against (main plate 2), shifted by _{2π (r 1 + r 2)} .

When the shift amount required for the rotation prevention plate 6 is S, the first ball 71 moves by S × r ₁ / (r ₁ + r ₂ ) relative to the first yoke 3, and the rotation prevention plate 6 moves relative to the rotation prevention plate 6. And move by S × r ₂ / (r ₁ + r ₂ ). Therefore, the first rolling guide portion 31 needs to have a length of at least S × r ₁ / (r ₁ + r ₂ ), and the second rolling guide portion 61 has at least S × r ₂ / A length of (r ₁ + r ₂ ) is required.

As in the prior art, the distance r ₁ from the rotation center of the first ball to the contact point with the first ball at the first rolling guide portion and the contact point at the second rolling guide portion. When the distance r ₂ is the same (r ₁ = r ₂ ), the first and second rolling guide portions need to have the same length. That is, at least 0.5S is required as the length of the first and second rolling guide portions for both the first yoke and the rotation prevention plate.

On the other hand, in this embodiment, by satisfying the condition of r ₁ > r ₂ , the length required for the first rolling guide portion 31 is larger than 0.5S, and the second rolling guide is provided. The length required for the part 61 is smaller than 0.5S.

For example, theta ₁ and a 120 °, when the theta ₂ and 60 °, the required length length required for the first rolling guide unit 31 0.65S next, the second rolling guide unit 61 Becomes 0.35S. As a result, the second rolling guide 61 can be shortened by 0.15S compared to the conventional case. The size of the rotation prevention plate 6 depends on the size of the second rolling guide portion 61. In other words, where to place the second rolling guide portion 61 is determined for the purpose of stably holding the rotation prevention plate 6, and sufficient strength is secured to the second rolling guide portion 61 arranged there. The thickness of the second rolling guide 61 is added to the thickness that can be obtained. This is shown in FIG.

  In FIG. 7, the length in the shift direction of the rotation prevention plate 6 (here, the length of the portion including the two second rolling guide portions 61) Lm is determined by the lengths of L1, L2, and L3. Among these, L1 is determined as a length necessary for supporting the rotation prevention plate 6 in a balanced manner. L3 is determined as a width necessary to give the second rolling guide portion 61 sufficient strength. Further, L2 is a length required as a distance at which the first ball 71 rolls relative to the second rolling guide portion 61 at least, and in practice, a slight margin is provided to avoid the influence of the end portion. I have it.

  According to the present embodiment, L2 can be reduced. Thereby, the length Lm in the yaw direction which is the shift direction of the rotation prevention board 6 can be made small.

  Further, by shortening the length in the shift direction of the rotation prevention plate 6 that shifts with respect to the base plate 2, the entire image blur correction device can be reduced in size.

  As shown in FIG. 8B, when the length of the rotation prevention plate 6 in the shift direction is Lm, the length of the shift region, which is a region where the rotation prevention plate 6 to be shifted can exist, is shifted to the length Lm. Lm + S with the amount S added. Other components cannot be arranged in this shift region, and the longer Lm + S, the larger the device. The other components referred to here include a component that is fixed to the base plate 2, a drive mechanism for the cover diaphragm that is disposed adjacent to the pitch / yaw actuator, the correction lens position sensor, and the image blur correction device.

  Therefore, by shortening the length Lm as in this embodiment, the shift region Lm + S is also shortened, and the entire apparatus can be miniaturized.

  On the other hand, in the present embodiment, the length of the first rolling guide portion 31 is longer than the conventional one. However, since the first yoke 3 is a fixed member and does not move, it is difficult to increase the size of the entire apparatus. In the present embodiment, the first yoke 3 is used as a yoke of the pitch / yaw actuator, and the size is determined by the conditions. Therefore, even if the first rolling guide portion 31 becomes longer, the first yoke 3 is used. This does not directly lead to an increase in the size of one yoke 3.

Further, as described above, the relationship between the first yoke 3 and the rotation prevention plate 6 can also be applied to the rotation prevention plate 6 and the ball receiving plate 5. That is, the angle formed by the V groove of the third rolling guide portion 62 in the rotation preventing plate 6 is made larger than the angle formed by the V groove of the fourth rolling guide portion 51 in the ball receiving plate 5. In other words, the distance (third distance) r ₃ from the center of rotation of the second ball to the contact point with the second ball at the third rolling guide portion 62 is defined as the fourth rolling guide. The distance to the contact point in the portion 51 (fourth distance) is larger than r ₄ (so that the condition of r ₃ > r ₄ is satisfied). Thereby, the length in the pitch direction of the 4th rolling guide part 51 can be shortened, and the ball receiving plate 5 can be reduced in size in the pitch direction which is the shift direction. Therefore, the shift area of the ball receiving plate 5 can be reduced to reduce the size of the entire apparatus.

  Further, depending on the design conditions, it may be desired to reduce the size of the rotation prevention plate 6 while increasing the shift region of the ball receiving plate 5. For example, interference with the ball receiving plate 5 is avoided in the optical axis direction, but there are other components that need to provide relief in the direction perpendicular to the optical axis with respect to the rotation prevention plate 6. This is the case.

In such a case, the angle formed by the V groove of the third rolling guide portion 62 provided in the rotation prevention plate 6 is smaller than the angle formed by the V groove of the fourth rolling guide portion 51 in the ball receiving plate 5. To do. In other words, the distance r ₃ from the center of rotation of the second ball to the contact point with the second ball at the third rolling guide portion 62 is the contact point at the fourth rolling guide portion 51. Is smaller than the distance r ₄ (so that the condition of r ₃ <r ₄ is satisfied). As a result, the length of the third rolling guide portion 62 of the rotation prevention plate 6 can be shortened, interference between the rotation prevention plate 6 and other parts can be avoided, and the overall size of the apparatus can be reduced. Can be planned.

In this example, both the distance r ₁ is greater than the distance r ₂ (r ₁ > r ₂ ) and the distance r ₃ is different from the distance r ₄ (r ₃ > r ₄ or r ₃ <r ₄ ). The case where the conditions are satisfied has been described. However, it is not always necessary to satisfy both conditions, and it is sufficient to satisfy at least one of the conditions. This is the same in other embodiments described later.

  Next, an image blur correction apparatus according to a second embodiment of the present invention will be described. Members having the same functions as those of the first embodiment are given the same names as those of the first embodiment, and detailed description thereof is omitted. In the first embodiment, a ball is used as the rolling member. However, in this embodiment, a rotating body different from the ball is used as shown in FIGS. 9 (a) and 9 (b). FIG. 9A shows an exploded view of the first yoke 13 having the first rolling guide portion 131, the rotation prevention plate 16 having the second rolling guide portion 161, and the rotating body 171. ing. FIG. 9B shows a cross section when these are cut along a plane orthogonal to the yaw direction, which is the rolling direction of the rotating body 171.

  The rotating body 171 has a contact surface formed by bonding the bottom surfaces of two conical surfaces, and rolls about an axis connecting the vertices of the two conical surfaces.

  Each of the first rolling guide portion 131 and the second rolling guide portion 161 is formed by a shaft member having two cylindrical shapes extending in the yaw direction. The cylindrical surfaces of these two shaft members are in contact with the contact surfaces (two conical surfaces) of the rotating body 171 at two points.

The interval between the two shaft members constituting the second rolling guide portion 161 is set to be larger than the interval between the two shaft members constituting the first rolling guide portion 131. As a result, as in the first embodiment, the relationship r ₁ > r ₂ is obtained, and the rotation prevention plate 16 and the entire apparatus can be reduced in size. Further, the same configuration is applied to the third rolling guide portion provided on the rotation preventing plate 16 and the fourth rolling guide portion provided on the rotating body receiving plate (corresponding to the ball receiving plate 5 of the first embodiment). By applying, the relationship r ₃ > r ₄ or r ₃ <r ₄ is obtained. Thereby, size reduction of a rotary body receiving plate and the whole apparatus can be achieved.

  Next, an image shake correction apparatus according to a third embodiment of the present invention will be described. Members having the same functions as those of the first embodiment are given the same names as those of the first embodiment, and detailed description thereof is omitted. Also in this embodiment, as shown in FIGS. 10A and 10B, a rotating body different from the ball is used. FIG. 10A shows an exploded view of the first yoke 23 having the first rolling guide portion 231, the rotation prevention plate 26 having the second rolling guide portion 261, and the rotating body 271. ing. FIG. 10B shows a cross section when these are cut along a plane perpendicular to the yaw direction that is the rolling direction of the rotating body 271.

  The rotating body 271 has a contact surface having a shape formed by facing the apexes of two conical surfaces, and rolls about an axis connecting the apexes of the two conical surfaces.

  Each of the first rolling guide portion 231 and the second rolling guide portion 261 is formed by a shaft member having one cylindrical shape extending in the yaw direction. The cylindrical surfaces of these shaft members are in contact with the contact surfaces (two conical surfaces) of the rotating body 271 at two points.

The diameter of the shaft member constituting the second rolling guide portion 261 is set smaller than the diameter of the shaft member constituting the first rolling guide portion 231. Thereby, similarly to Example 1, the relationship r ₁ > r ₂ is obtained, and the rotation prevention plate 26 and the entire apparatus can be reduced in size. Further, the same configuration is applied to the third rolling guide portion provided on the rotation preventing plate 26 and the fourth rolling guide portion provided on the rotating body receiving plate (corresponding to the ball receiving plate 5 of the first embodiment). By applying, the relationship r ₃ > r ₄ or r ₃ <r ₄ is obtained. Thereby, size reduction of a rotary body receiving plate and the whole apparatus can be achieved.

  Next, an image blur correction apparatus according to a fourth embodiment of the present invention will be described. Members having the same functions as those of the first embodiment are given the same names as those of the first embodiment, and detailed description thereof is omitted. Also in this embodiment, a rotating body different from the ball is used as shown in FIG. In FIG. 11, the first yoke 33 having the first rolling guide portion 331, the rotation preventing plate 36 having the second rolling guide portion 361, and the rotating body 371 are rolled by the rotating body 371. The cross section when cut along a plane orthogonal to the yaw direction, which is the direction, is shown.

  The rotating body 371 has a contact surface formed by coaxially providing two cylindrical surfaces having different diameters, and rotates the central axis of the two cylindrical surfaces (hereinafter referred to as a large diameter cylindrical surface and a small diameter cylindrical surface). Roll as the center. In this embodiment, two small-diameter cylindrical surfaces are provided across the large-diameter cylindrical surface, but even in such a case, since there are two different diameters, they are handled as two cylindrical surfaces.

  The first rolling guide part 331 is formed as one flat groove (a groove having a flat bottom surface) extending in the yaw direction. The width of the flat groove is set slightly larger than the width of the large-diameter cylindrical surface. The large-diameter cylindrical surface of the rotating body 371 contacts the first rolling guide portion (flat groove) 331 with one line, and the both sides of the flat groove move in the pitch direction of the rotating body 371. Movement is prevented. The second rolling guide portion 361 extends in the yaw direction, and has two flat protrusions (protrusions whose protruding end surfaces are flat surfaces) sandwiching a flat groove having the same width as the first rolling guide portion 331. Is formed. The small-diameter cylindrical surface of the rotating body 371 contacts the second rolling guide portion 361 with two lines. Moreover, the movement of the rotating body 371 in the pitch direction is prevented by both side surfaces of the flat groove between the two flat protrusions.

In this embodiment, by providing a small diameter cylindrical surface of the large diameter cylindrical surface of radius r ₁ to the rotating body 371 and the radius r _2, similarly, the relationship of r _1> r ₂ is obtained as in Example 1, rotation The size of the blocking plate 36 and the entire apparatus can be reduced. Further, the same configuration is applied to the third rolling guide portion provided on the rotation preventing plate 36 and the fourth rolling guide portion provided on the rotating body receiving plate (corresponding to the ball receiving plate 5 of the first embodiment). By applying, the relationship r ₃ > r ₄ or r ₃ <r ₄ is obtained. Thereby, size reduction of a rotary body receiving plate and the whole apparatus can be achieved.

  In the present embodiment, since the rotating body 371 can be supported by line contact at each rolling guide portion, the pressure acting on each rolling guide portion can be reduced. Thereby, the requirement of wear resistance for the rolling guide portion is relaxed, and the rolling guide portion can be provided on the resin member. For this reason, it is possible to reduce the number of parts, for example, by removing the rotating body receiving plate and providing a rolling guide portion on a resin-made shift barrel.

  In each of the above-described embodiments, the case where the correction lens, which is an optical element, is shifted for image blur correction has been described. However, an imaging element such as a CCD sensor or a CMOS sensor that photoelectrically converts an optical image is parallel to the light receiving surface. It may be shifted in any direction.

  Each embodiment described above is only a representative example, and various modifications and changes can be made to each embodiment in carrying out the present invention.

  It is possible to provide a small image blur correction device and an optical apparatus equipped with the same.

DESCRIPTION OF SYMBOLS 1 Correction lens 2 Base plate 31 1st rolling guide part 4 Shift lens barrel 5 Ball receiving plate 51 4th rolling guide part 6 Rotation prevention board 61 2nd rolling guide part 62 3rd rolling guide part 71 , 72, 73 First ball 81, 82, 83 Second ball

Claims (9)

A base member;
A movable member that holds an optical element or an imaging element and is movable in a first direction with respect to the base member;
It is arranged between the base member and the movable member in a second direction orthogonal to the first direction, and rolls in the first direction as the movable member moves in the first direction. A rolling member that
The base member has a first rolling guide portion that contacts the rolling member at a first distance in the second direction from the rotation center of the rolling member;
The movable member has a second rolling guide portion that contacts the rolling member at a second distance in the second direction from the rotation center of the rolling member;
The image blur correction apparatus characterized in that the first distance is larger than the second distance.   2. The image blur correction device according to claim 1, wherein each of the first and second rolling guide portions is in contact with the rolling member at two points.   The rolling member has, as a contact surface with the first and second rolling guide portions, one of a spherical contact surface and two contact surfaces formed by two conical surfaces. The image blur correction device according to claim 2.   The said rolling member has two contact surfaces formed by two cylindrical surfaces with mutually different diameters as a contact surface with the said 1st and 2nd rolling guide part. The image blur correction apparatus described. A base member;
A movable member that holds an optical element or an imaging element and is movable in a first direction including two directions orthogonal to the base member;
A guide member disposed between the base member and the movable member in a second direction orthogonal to the first direction;
One direction of the second direction is disposed between the base member and the guide member in the second direction, and the movable member moves in one direction of the two directions included in the first direction. A first rolling member that rolls into
Along with the movement of the movable member in the other direction of the two directions that are arranged between the base member or the guide member and the movable member in the second direction and are included in the first direction. A second rolling member that rolls in the other direction,
The base member has a first rolling guide portion that contacts the first rolling member at a first distance in the second direction from the rotation center of the first rolling member. ,
The guide member has a second rolling guide portion that contacts the first rolling member at a second distance in the second direction from the rotation center of the first rolling member. ,
The base member or the guide member is in contact with the second rolling member at a third distance in the second direction from the rotation center of the second rolling member. Part
The movable member has a fourth rolling guide portion that contacts the second rolling member at a fourth distance in the second direction from the rotation center of the second rolling member. And
An image blur correction apparatus characterized by satisfying at least one of a condition that the first distance is larger than the second distance and the third distance is different from the fourth distance.   The first and second rolling guide portions and the third and fourth rolling guide portions are in contact with the first rolling member and the second rolling member at two points, respectively. The image blur correction device according to claim 5.   The first and second rolling members have spherical shapes as contact surfaces with the first and second rolling guide portions and contact surfaces with the third and fourth rolling guide portions, respectively. The image blur correction apparatus according to claim 6, which has one of two contact surfaces formed by a contact surface and two conical surfaces.   The first and second rolling members have a diameter as a contact surface with the first and second rolling guide portions and a contact surface with the third and fourth rolling guide portions, respectively. 6. The image blur correction device according to claim 5, comprising two contact surfaces formed by two different cylindrical surfaces. An optical apparatus comprising the image blur correction device according to claim 1.