JPH1130794A - Shake correcting device for optical device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the shake correcting device of an optical device where inclination to the optical axis of a shake correction optical system is adjusted by a simple constitution. SOLUTION: A lens holding frame 2 is attached so as to be movable in the X axis direction on a baseplate 6, and the baseplate 6 is attached so as to be movable in the Y axis direction to a lens barrel 10, and they are driven by an X axis actuator 50 and a Y axis actuator 70. Conical holes 32c and 32d holding guide balls 31a and 31b are provided at the baseplate 6, and V-shaped grooves 32p and 32q extending in the Y axis direction are provided at a lens barrel 10, and balls are rolled in a groove, so that the baseplate 6 is guided in the Y axis direction. The conical holes 2c and 2d holding the guide balls 18a and 18b are provided at the lens holding frame 2, and the V-shaped grooves 6p and 6q extending in the X axis direction are provided at the baseplate 6, and the balls 18a and 18b are rolled in the groove, so that the lens holding frame 2 is guided in the X axis direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shake correcting device for an optical device.

[0002]

2. Description of the Related Art Conventionally, as a means for correcting image blurring on an image forming surface due to camera shake caused during camera photography, a correction lens disposed immediately after a diaphragm of a photographing lens is orthogonal to an optical axis direction. 2. Description of the Related Art There is known a shake correction optical system that is driven in a plane that moves. In the lens device provided with the shake correction optical system, a dedicated drive mechanism for driving the correction lens in a predetermined direction is incorporated in the lens device.

As a correction lens driving mechanism of the above-mentioned shake correcting optical system, a driving mechanism including a motor and a gear reduction mechanism has been conventionally used. For example, JP-A-7-281
The device disclosed in Japanese Patent No. 15 drives a movable member driven by a motor, a gear reduction mechanism, and a drive mechanism using a feed screw, and the movable member corresponds to a roller having an axis in the optical axis direction. It is urged so as to be in contact with it, and is urged toward four balls provided with retainers in the optical axis direction to move accurately in the optical axis direction.

[0004]

In such a configuration,
Not only is the motor large, but also the gear reduction mechanism occupies a large space due to the incorporation of a mechanism that eliminates the backlash. The use of the speed reduction mechanism has the disadvantage that noise is generated during operation and the quality of the product is degraded.

Further, since biasing members for biasing the movable member toward the rollers or balls are often used, not only the number of parts increases but also a large loss of driving force is caused. There was.

The present invention solves the above-mentioned problems by reducing the number of parts and loss of driving force, and furthermore, provides a shake correction device for an optical device capable of adjusting the tilt of the shake correction optical system with respect to the optical axis with a simple configuration. It is intended to provide.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems. According to the first aspect of the present invention, a part or all of a main optical system is disposed so as to be movable in a plane perpendicular to an optical axis. The corrected shake correction optical system, first optical system guide means for guiding the shake correction optical system in a first direction, and a first optical system guide means for guiding the shake correction optical system by the first optical system guide means. Driving means for driving the first optical system and second optical system guiding means for guiding the first driving means in a second direction intersecting the first direction. And a second drive unit for driving the first optical system guide unit and the first drive unit in a second direction guided by the second optical system guide unit. In the correction device, the first optical system guide means and the second optical system guide Are respectively provided between the correction optical system holding member and the movable member, and between the movable member and the lens barrel, the V-groove extending in the guiding direction, and at least two rollably held on the V-groove. It is characterized by comprising a ball.

The inclination of the shake correcting optical system with respect to the optical axis can be adjusted by selecting the diameter of a ball constituting the first or second optical system guiding means.

Further, the first and second driving means apply a driving pulse to the electromechanical transducer to generate expansion and contraction displacement, so that a driving member connected to the electromechanical transducer has reciprocating vibrations having different speeds. And a driving device that drives a driven member frictionally coupled to the driving member in a predetermined direction.

Further, the first optical system guide means and the first drive means are arranged on the movable member, and the movable member intersects the first direction by the second optical system guide means. It can be configured to be guided in a second direction.

[0011]

Embodiments of the present invention will be described below. FIG. 1 is a front view showing a configuration of a shake correction device in an optical device according to the present invention, and FIG.
FIG. 3 is a cross-sectional view along the line BB in FIG. 1, and FIG. 4 is a cross-sectional view along a line CC in FIG.

In FIG. 1 to FIG. 4, reference numeral 1 denotes a correction lens constituting a shake correction optical system, and reference numeral 2 denotes a lens holding frame for holding the correction lens 1, which constitutes a correction optical system holding member. Reference numeral 3 denotes a light blocking member for preventing light leakage, and 4 denotes a shutter device. The light blocking member 3 and the shutter device 4 are fixed to the lens holding frame 2. Reference numeral 10 denotes a lens barrel.

The lens holding frame 2 is mounted movably in the X-axis direction on a base plate 6 constituting a movable member, and is driven by an X-axis actuator 50 described later. The base plate 6 is mounted movably in the Y-axis direction with respect to the lens barrel 10, and is driven by a Y-axis actuator 70 described later.

Here, the X-axis actuator 50 constituting the first driving means and the Y-axis actuator 70 constituting the second driving means will be described. Since the X-axis actuator and the Y-axis actuator have substantially the same configuration, the X-axis actuator will be described first.

In FIG. 1, a support block 5 on a base plate 6 is shown.
One end of a piezoelectric element 52 of the X-axis actuator 50 is bonded and fixed to 1, and a drive shaft 53 is bonded and fixed to the other end of the piezoelectric element 52. The drive shaft 53 is supported by blocks 54 and 55 provided on the base plate 6 so as to be movable in a direction parallel to the X axis. A moving member 56 having a frictional coupling portion is frictionally coupled to the drive shaft 53 with an appropriate frictional force.
The moving member 56 is connected to the lens holding frame 2.

The structure of the friction coupling portion of the moving member 56 will be described with reference to FIGS. FIG. 5 is an exploded perspective view showing the configuration of the friction coupling portion of the moving member. As is clear from FIGS. 3 and 5, the extension portion 2 extended from the lens holding frame 2 is shown.
The moving member 56 is connected to the moving member 56a.
A first block 12 having a V-shaped groove therein and a second block 12 therein.
The block 13 and the spring 14 are arranged, and the engaging portion 56c of the pressing member 56b is engaged with the engaging portion 56d of the moving member 56 to form a friction coupling portion.

That is, the first block 12 and the second block 1
The drive shaft 53 penetrates the facing V-shaped groove between the drive shaft 3 and the movable member 56 comprising the drive shaft 53 and the blocks 12 and 13 by a spring 14 mounted behind the second block 13. It is frictionally coupled by frictional force. Here, a hemispherical projection 56a is formed on the surface of the moving member 56 where the first block 12 contacts, and the first block 12 is configured to be tiltable. The drive shaft 53 and the first block 1
Contact exactly with 2. The moving member 56 may be formed integrally with the extension 2a extending from the lens holding frame 2.

Next, the Y-axis actuator 70 will be described. In FIG. 1, one end of a piezoelectric element 72 of a Y-axis actuator 70 is adhesively fixed to a support block 71 on a lens barrel 10, and a drive shaft 73 is adhesively fixed to the other end of the piezoelectric element 72. The drive shaft 73 is supported by blocks 74 and 75 provided on the lens barrel 10 so as to be movable in a direction parallel to the Y axis. A moving member 76 having a frictional coupling portion is frictionally coupled to the drive shaft 73 with an appropriate frictional force, and the movable member 76 is coupled to the base plate 6.

The configuration of the friction coupling of the moving member 76 is similar to the configuration of the friction coupling of the moving member 56 described above with reference to FIG. As shown in FIG. 4, the configuration of the friction coupling portion of the moving member 76 is such that the moving member 76 is connected to an extension 6a extended from the base plate 6, and
Has a first block 77, a second block 78 and a spring 79 having a V-shaped groove therein, and a pressing member 76.
b to form a friction coupling portion.

That is, the first block 77 and the second block 7
The drive shaft 73 penetrates the opposite V-shaped groove between the drive shaft 8 and the movable member 76 including the drive shaft 73 and the blocks 77, 78 by a spring 79 mounted behind the second block 78. It is frictionally coupled by frictional force. Here, the first
The moving member 76 facing the block 77 has a hemispherical projection 7.
Since the first block 6a is formed, the first block 77 can be tilted, so that the drive shaft 73 and the movable member 76 can be accurately contacted even if there is a slight inclination between the drive shaft 73 and the movable member 76.

A configuration for supporting the base plate 6 movably in the Y-axis direction on the lens barrel 10 will be described with reference to FIGS. FIG. 6 is an exploded perspective view showing a configuration of a portion that supports the base plate 6 so as to be movable in the Y-axis direction.
Guide balls 31a, 31 for guiding the base plate 6 in the Y-axis direction
Conical holes 32c and 32d for rotatably holding b are provided. On the other hand, the lens barrel 10 is provided with V-shaped grooves 32p and 32q extending in the Y-axis direction.
1a and 31b are configured to roll in the groove. Further, on the base plate 6, there is provided a support 6 for supporting the ball 20.
f is provided.

A spring member 26 is interposed between the extension portion 10e of the lens barrel 10 and the ball 20, and the base plate 6 is moved by the action of the spring member 26 via the guide balls 31a and 31b. It is urged in the direction of pressing against 10. At this time, the lens barrel 1
The ball 20 is arranged between the zero extension 10e and the spring member 26 to reduce the friction of the contact surface between the spring member 26 and the base plate 6.

With this configuration, the base plate 6 is supported movably in the Y-axis direction with respect to the lens barrel 10. Therefore, when the Y-axis actuator 70 is operated to move the moving member 76 in the Y-axis direction. The base plate 6 connected to the moving member 76 can be moved up and down in FIG. 1 and can be moved to the near side or the back side with respect to the plane of FIG.

Next, a configuration for supporting the lens holding frame 2 on the base plate 6 so as to be movable in the X-axis direction will be described with reference to FIGS.

A guide ball 18 is provided on the lens holding frame 2.
a, 18b are rotatably held in conical holes 2c, 2c
d, while the base plate 6 is provided with V-shaped grooves 6p and 6q extending in the X-axis direction.
a, 18b are configured to roll in a V-shaped groove. A spring member 15 is interposed between the lens holding frame 2 and the extension 6e of the base plate 6, and urges the lens holding frame 2 in a direction in which the lens holding frame 2 is pressed against the base plate 6 via the guide balls 18a and 18b. In this configuration, a ball 19 is arranged between the extension 6e of the base plate 6 and the spring member 15 to reduce friction.

With this configuration, the lens holding frame 2 is
Since the movable member 56 is moved in the X-axis direction by operating the X-axis actuator 50, the lens holding frame 2 coupled to the movable member 56 In FIG. 1, it can be moved in the left-right direction, and in FIG.

The position of the lens 1 in the Y-axis direction is shown in FIG.
As shown in FIG. 2, a light emitting diode (LE) provided on the base plate 6 is provided.
D) 41 and a photo diode (P) provided on the lens barrel 10.
SD) 42. The position of the lens 1 in the X-axis direction is, as shown in FIG. 3, a light emitting diode (LED) 43 provided on the lens holding frame 2 and a photo diode (PSD) provided on the base plate 6. 44.

X-axis actuator 50 and Y-axis actuator
The operation of the actuator 70 is the same as that of a known electromechanical transducer, for example, a linear actuator using a piezoelectric element.
The operation will be briefly described. The X-axis actuator 5
Since the 0 and Y axis actuators 70 have substantially the same configuration, the operation of the X axis actuator 50 will be described here, and the description of the operation of the Y axis actuator 70 will be omitted.

In FIG. 1, a drive pulse having a waveform consisting of a gentle rising portion and a rapid falling portion as shown in FIG. 7A is applied to the piezoelectric element 52 of the X-axis actuator 50. Then, at a gentle rising portion of the drive pulse, the piezoelectric element 52 gradually expands in the thickness direction, and the drive shaft 53 is displaced in the direction indicated by the arrow a. Therefore, the moving member 56 frictionally coupled to the drive shaft 53 at the friction coupling portion and the lens holding frame 2 coupled to the moving member 56 also move in the direction of arrow a.

That is, the drive shaft 53 and the first block 12 and the second block 13 of the frictional connection portion of the moving member 56 are pressed against each other by the spring 14 to be frictionally connected. Is set to be sufficiently larger than the force for moving in the axial direction of the drive shaft 53 and the moving member 56.
Moves in the direction of arrow a, and the lens holding frame 2 also moves in the direction of arrow a.

At the rapid falling portion of the drive pulse, the piezoelectric element 52 rapidly contracts in the thickness direction, and the drive shaft 53 is also displaced in the direction opposite to the arrow a. At this time, since the inertia force of the moving member 56 and the lens holding frame 2 frictionally coupled to the drive shaft 53 is greater than the frictional coupling force, the moving member 56 and the lens holding frame 2 substantially overcome the frictional coupling force with the drive shaft 53 and thus substantially overcome the frictional coupling force. Stay in that position and do not move.

The term "substantially" as used herein means that in both the direction of the arrow a and the direction opposite thereto, the drive shaft 53 and the moving member 56 follow each other while slipping, and the difference between the drive times is reduced. Therefore, it includes that which moves in the direction of arrow a as a whole. What kind of movement will be
Determined according to given friction conditions.

By continuously applying the drive pulse having the above-described waveform to the piezoelectric element 52, the correction lens can be continuously moved in the positive direction of the X axis.

When the correction lens is moved in the negative direction of the X-axis, a drive pulse having a waveform consisting of a rapid rising portion as shown in FIG. It can be achieved by applying.

[0035]

As described above, the present invention comprises first and second optical system guide means for guiding the shake correction optical system in the first direction, and these guide means are provided as correction optical system holding members. A V-shaped groove formed between the movable member and the movable member, and between the movable member and the lens barrel, and at least two balls rotatably held on the V-shaped groove. Therefore, the number of components for guiding the shake correction optical system in a predetermined guide direction can be reduced, the loss of driving force due to friction or the like can be reduced, and the inclination of the shake correction optical system with respect to the optical axis can be reduced. It has a remarkable effect, such as easy adjustment by changing the diameter of the nozzle.

[Brief description of the drawings]

FIG. 1 is a front view showing the configuration of a shake correction device for an optical device according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a sectional view taken along the line BB of FIG. 1;

FIG. 4 is an essential part cross-sectional view along the line CC in FIG. 1;

FIG. 5 is an exploded perspective view showing a configuration of a friction coupling portion of the moving member.

FIG. 6 is an exploded perspective view showing a configuration of a portion that supports the base plate so as to be movable with respect to the lens barrel.

FIG. 7 illustrates a waveform of a driving pulse.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Correction lens which comprises a shake correction optical system 2 Lens holding frame 2c, 2d conical hole 3 Light shielding member 4 Shutter device 6 Base plate 6p, 6q V-shaped groove 10 Lens barrel 18a, 18b Guide ball 31a, 31b 32p, 32q V-shaped groove 50 X-axis actuator 70 Y-axis actuator

Claims (4)

[Claims] 1. A shake correction optical system in which a part or the whole of a main optical system is movably arranged in a plane perpendicular to an optical axis, and a first guide for guiding the shake correction optical system in a first direction. 1 optical system guide means, 1st drive means for driving the shake correction optical system in a first direction guided by the 1st optical system guide means, 1st optical system guide means, and A second optical system guiding means for guiding a first driving means in a second direction intersecting with the first direction; and a first optical system guiding means and the first driving means being connected to the second driving means. A shake correcting device for an optical device comprising: a second driving unit that drives in a second direction guided by the optical system guiding unit; wherein the first optical system guiding unit and the second optical system guiding unit are , Respectively, between the correction optical system holding member and the movable member,
And a V-shaped groove formed between the movable member and the lens barrel, the V-shaped groove extending in the guiding direction, and at least two balls rotatably held on the V-shaped groove. Image stabilizer. 2. A ball constituting the first or second optical system guide means, wherein the inclination of the shake correction optical system with respect to the optical axis is set.
2. The apparatus according to claim 1, wherein the apparatus is adjusted by selecting a diameter of the lens. 3. The reciprocating vibration having different speeds in a driving member coupled to the electromechanical transducer by applying a drive pulse to the electromechanical transducer to generate expansion and contraction displacement. 2. A vibration correcting device for an optical device according to claim 1, wherein said driving device is configured to drive the driven member frictionally coupled to said driving member in a predetermined direction. 4. The first optical system guiding means and the first optical system guiding means.
The driving means is disposed on the movable member, and the movable member is guided by the second optical system guiding means in a second direction intersecting the first direction. A shake correction device for an optical device according to claim 1.