JPH10104677A - Shake correction lens device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a device compact by constituting it so that two lens groups are driven in different directions. SOLUTION: Signals outputted from position detection means 16 and 20 arranged on a yaw lens barrel 7 and a pitch lens barrel 8 are integrated by an electric circuit and angular displacement is outputted. Based on the angular displacement, coils 12 and 17 are energized. Then, magnetic flux generated from the coils 12 and 17 is made to act on yokes 14 and 19 and balanced with' he magnetic flux of magnets 13 and 18 so as to respectively move time lens barrels 7 and 8. The lens barrel 7 is driven along guide bars 11a and 11b in a horizontal direction and the lens barrel 8 is driven along guide bars 11c and 11d in a vertical direction. Then, a photographing optical axis is decentered. In such a way, the above driving control action is executed based on the outputs from the detection means 16 and 20 so that the stability of an image is secured on an image pickup surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens barrel such as a photographing lens which receives vibration and a vibration correcting lens apparatus used for suppressing vibration of the photographing apparatus.

[0002]

2. Description of the Related Art A conventional anti-vibration mechanism used for a lens barrel detects a shake amount of a lens body by an angular velocity sensor or the like.
The output from the angular velocity sensor is integrated by the control circuit, the value is transmitted to the actuator by the drive circuit, and some of the lenses of the lens barrel composed of a plurality of lens groups are moved up, down, left, right, or in a plane perpendicular to the optical axis. A configuration is adopted in which the lens is moved by a predetermined amount in a direction based on the combination thereof, and the shake of the lens is optically corrected.

In this case, the actuator is composed of a magnet, a coil, and the like, and moves a lens group by causing a magnetic flux generated by a current supplied to the coil to act on the magnet. As for the arrangement of these coils and magnets, two types, one for the vertical drive direction and one for the left and right drive direction, are arranged on the outer peripheral side of the moving lens group on a plane perpendicular to the optical axis.

[0004]

However, in the above-mentioned conventional structure, however, there are two vertical driving directions and two horizontal driving directions on the outer peripheral side of the moving lens group on a plane perpendicular to the optical axis.
Since the various types of magnets and coils are arranged, the unit has a large outer diameter when considering the unit of the vibration-proof lens group, and there is a disadvantage that the outer diameter of the lens body is increased.

An object of the present invention is to solve the above-mentioned problems,
An object of the present invention is to provide a small image stabilizing lens device that performs driving in two orthogonal directions with respect to separate lens groups.

[0006]

According to a first aspect of the present invention, there is provided an image stabilizing lens apparatus comprising: a first lens group and a second lens group in a lens barrel having a plurality of lens groups; Wherein the first and second driving mechanisms comprise magnets and coils formed on a plane parallel to the optical axis. The magnets and coils of the first and second drive mechanisms are oriented in directions orthogonal to each other.

Further, according to a second aspect of the present invention, in a lens barrel having a plurality of lens groups,
A first lens group and a second lens group which are respectively driven in directions orthogonal to each other by first and second driving mechanisms, wherein the first and second driving mechanisms are parallel to the optical axis. The magnet and the coil of the first and second drive mechanisms are oriented in directions orthogonal to each other, and the respective magnets and coils of the first and second drive mechanisms face each other. Characterized in that the direction is

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to the illustrated embodiment. FIG. 1 is a cross-sectional view of the lens body, in order from the object side, a first lens barrel 1, a guide cylinder 2, an aperture unit 3,
A yaw barrel 7 attached to the moving barrel 5 and the holding barrel 6 driven by the focus drive unit 4 and performing a vibration proof operation
A pitch lens barrel 8 and a mount 9 are arranged. The optical glasses G1, G2, and G3 are the first lens barrel 1, the guide cylinder 2,
The optical glass G4 is fixed to the movable lens barrel 5, the optical glass G5 is fixed to the yaw lens barrel 7, and the optical glass G6 is fixed to the pitch lens barrel 8 by a press ring or a caulking.

The diaphragm unit 3 has a plurality of diaphragm blades and an actuator for rotating the diaphragm blades, and is fixed to the guide cylinder 2. The aperture unit 3 is connected to the circuit board 10 by a flexible printed board (not shown), and a signal from a camera is transmitted to the circuit board 10 from a contact 9 a provided on the mount 9, and is driven by a drive circuit in the circuit board 10. An operation of blocking a predetermined optical path is performed.

The focus drive unit 4 includes a vibration member 4a having a ring shape and a trapezoidal cross section, an electrostrictive element 4b joined to the vibration member 4a, a vibration absorber 4c pressed against the electrostriction element 4b, and a vibration absorber. A disc spring 4d for pressing the body 4c in the direction of the vibrating member is provided.
It is sandwiched by a holding ring 4e for holding d.
The rotation direction moving member 4f is coupled in the unit 4 with its rotation direction regulated and further in contact with the vibration member 4a, and a focus key 4g is screwed to the rotation direction movement member 4f. The rotation direction moving member 4f is
Due to the circumferential traveling wave vibration generated at a, the optical disc rotates with the focus key 4g about the optical axis.

The movable lens barrel 5 is fitted to the guide cylinder 2,
It has a structure that can move in the optical axis direction. A cam groove is formed in the fitting portion of the guide barrel 2 with the movable barrel 5, and the cam barrel of the guide barrel 3 is passed through the movable barrel 5 to form a cam follower 5a.
Are fixed at a plurality of positions, and one of the cam followers 5a is a focus key 4g of the focus unit 4.
Is fitted.

The signal from the camera is transmitted to the contact 9a of the mount 9.
From the drive circuit in the circuit board 10 to the electrostrictive element 4b, the minute vibration of the electrostrictive element 4b is transmitted to the vibration member 8a, and the rotation direction moving member 4f of the vibration member 4a The rotational direction moving member 4f is rotated by the circumferential wave vibration generated at the contact portion, the focus key 4g screwed to the rotational direction moving member 4f is rotated, and the cam follower 5a is rotated. Since the guide cylinder 2 is provided with a cam groove, the cam follower 5 a moves in the optical axis direction while rotating along the cam groove provided in the guide cylinder 2, and drives the movable lens barrel 5.

The yaw barrel 7 has an optical glass G5 of a concave lens group.
Is inserted and the flange protruding from the concave lens group is caulked and fixed. A sleeve portion 7a is provided at a lower end of an outer peripheral portion of the yaw lens barrel 7, and a U-shaped rotation stopping portion 7b is provided at an upper end of the sleeve portion 7a across the optical axis. A guide bar 11a fixed to the holding cylinder 6 is provided on the sleeve portion 7a.
Is inserted in parallel with the horizontal direction of the photographing screen, and a guide bar 11b similarly fixed to the holding cylinder 6 is provided on the rotation stopper 7b.
Are fitted. A coil 12 is attached to a coil fixing member (not shown) attached to the holding cylinder 6 near the sleeve portion 7a, and an end of the coil 12 is connected to the circuit board 10 via a flexible printed board.

On the optical axis side of the coil 12, a magnet 13 and a yoke 14 magnetically attached to the magnet 13 are arranged at a predetermined distance from the coil 12 and at a magnet fixing portion (not shown) protruding from the yaw barrel 7. Springs 15a and 15b are inserted on both sides of the guide bar 11a. The springs 15a and 15b are set to have the same spring load, and are set so as to hold the center of the optical axis of the lens group G5 inserted into the yaw barrel 7 near the center of the optical axis of the lens body. Position detection means 16 for detecting the position of the yaw lens barrel 7 is provided near the rotation stopper 7b. As the position detecting means 16, for example, a photoreflector that projects infrared light from an infrared light projecting element to a reflecting plate provided in the yaw barrel 7 and reads the reflected light, and a slit provided in the yaw barrel 7 A method of projecting infrared light from a light projecting element and reading infrared light transmitted through a slit, a method of reading a change in magnetic force by a magnet provided in a yaw barrel 7 and an MR element arranged near the magnet, and the like are used. Have been.

The pitch lens barrel 8 includes an optical glass G of a convex lens group.
6 is inserted, and the flange protruding from the convex lens group is caulked and fixed. A sleeve portion 8a is provided at a side end of an outer peripheral portion of the pitch lens barrel 8, and a U-shaped rotation stopper (not shown) is provided on an opposite side of the sleeve portion 8a across the optical axis. A guide bar 11c fixed to the holding cylinder 6 is inserted through the sleeve 8a in parallel with the vertical direction of the photographing screen, and a guide bar 11d is fitted in the rotation stopper in parallel with the guide bar 11c. A coil fixing member (not shown) fixed to the coil 17 and attached to the holding cylinder 6 is provided near the sleeve portion 8a, and the terminal portion of the coil 17 is connected to the circuit board 1 via a flexible printed board.
Connected to 0.

A magnet 18 and a yoke 19 magnetically attached to the magnet 18 are provided on the optical axis side of the coil 17.
The magnet is fixed to a magnet fixing portion (not shown) protruding from the pitch lens barrel 8 at a predetermined interval. Information bar 11
Springs 15a and 15b are inserted above and below c, respectively. The springs 15a and 15b are set to have the same spring load, and the center of the optical axis of the lens group G6 inserted into the pitch lens barrel 8 is adjusted by the light of the lens body. It is set to be held near the axis center.

In the vicinity of the rotation stopper, there is provided a position detecting means 20 equivalent to the position detecting means 16 of the pitch lens barrel 7 for detecting the position of the pitch lens barrel 8.

In operation, the shake of the lens is detected by angular velocity, angular acceleration, angular displacement and the like. Output signals output from the position detecting means 16 and 20 provided in the yaw barrel 7 and the pitch barrel 8 are electrically integrated by a circuit provided in the circuit board 10 to output an angular displacement. Based on the angular displacement, the coils 12 and 17 are energized, and the magnetic flux generated from the coils 12 and 17 acts on the yokes 14 and 19 to balance the magnetic flux of the magnets 13 and 18. The yaw barrel 7 and the pitch barrel 8 are respectively moved by the driving force acting on the yoke 19. In the yaw barrel 7, the yaw barrel 7 is driven in the horizontal direction along the guide bars 11a and 11b, and in the pitch barrel 8, the pitch barrel 8 is driven in the vertical direction along the guide bars 11c and 11d. The optical axis is decentered. The position control loop circuit is provided in the circuit board 10, and the above-described drive control is performed by the outputs from the position detection means 16 and 20, thereby ensuring the stability of the image on the imaging surface.

FIG. 3 shows the second embodiment, and the same reference numerals as those in the first embodiment denote the same members. In the vicinity of the sleeve portion 7a of the yaw barrel 7, a magnet 31a, a yoke 32a magnetically attached to the magnet 31a, and a predetermined distance from the magnet 31a and the yoke 32a are fixed to a magnet fixing member attached to the holding cylinder 6. The magnet 31b and the yoke 32b magnetically attached to the magnet 31b
Is provided. The coil 12 is fixed to the yaw barrel 7.

In the vicinity of the sleeve portion 8a of the pitch lens barrel 8, a magnet 33a and a yoke 34a magnetically attached to the magnet 33a are separated from a magnet 33a and a yoke 34a magnetically attached to the magnet 33a by a magnet fixing member (not shown) attached to the holding cylinder 6. A magnet 33b and a yoke 34b magnetically attached to the magnet 33b are provided. The coil 17 is fixed to the pitch lens barrel 8.

In operation, the shake of the lens is detected by angular velocity, angular acceleration, angular displacement and the like. Position detecting means 16,
An output signal output from the circuit 20 is electrically integrated by a circuit provided in the circuit board to output an angular displacement. Based on the angular displacement, the coils 12 and 17 are energized, and the coil 1
The yaw lens barrel 7 and the pitch lens barrel 8 are driven by the driving forces acting on 2, 17 to decenter the photographing optical axis.

[0022]

As described above, in the image stabilizing lens device according to the present invention, the magnet and the coil are formed on the outer diameter sides of the lens barrels of the adjacent lens groups in a plane parallel to the optical axis. The miniaturization is realized by arranging the lens units and driving each lens group separately in two orthogonal directions.

[Brief description of the drawings]

FIG. 1 is a sectional view.

FIG. 2 is a configuration diagram of a first embodiment.

FIG. 3 is a configuration diagram of a second embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first lens barrel 2 guide barrel 3 aperture unit 4 focus drive unit 5 moving barrel 6 holding barrel 7 yaw barrel 8 pitch barrel 9 mount 10 circuit board 11 guide bar 12, 17 coil 13, 18, 31, 33 magnet 14, 19, 32, 34 Yoke 16, 20 Position detecting means

Claims (6)

[Claims] In a lens barrel having a plurality of lens groups, a first lens group and a second lens group are respectively driven in directions orthogonal to each other by first and second driving mechanisms. The first and second drive mechanisms are composed of magnets and coils formed on a plane parallel to the optical axis, and the magnets and coils of the first and second drive mechanisms are oriented in directions orthogonal to each other. A shake correction lens device characterized by the above-mentioned. 2. The apparatus according to claim 1, wherein the movement directions of the first lens group and the second lens group are restricted by a fixed guide bar and a sleeve inserted through the guide bar and fixed to the lens barrel. A shake correction lens device. 3. The first lens group is movable in one direction in a plane perpendicular to the optical axis and has a positive or negative lens power, and the second lens group is in a plane perpendicular to the optical axis. 2. The image stabilizing lens according to claim 1, wherein the image stabilizing lens is movable in a direction perpendicular to the direction of movement of the first lens group, and the lenses of the second lens group have lens powers having signs opposite to those of the first lens group. apparatus. 4. In a lens barrel having a plurality of lens groups, a first lens group and a second lens group are respectively driven in directions orthogonal to each other by first and second driving mechanisms. The first and second drive mechanisms are composed of magnets and coils formed on a plane parallel to the optical axis, and the magnets and coils of the first and second drive mechanisms are oriented in directions orthogonal to each other, and A shake correction lens device, wherein the magnets and the coils of the first and second drive mechanisms are set in directions facing each other. 5. The apparatus according to claim 4, wherein the movement directions of the first lens group and the second lens group are limited by a fixed guide bar and a sleeve inserted through the guide bar and fixed to the lens barrel. A shake correction lens device. 6. The first lens group is movable in one direction on a plane perpendicular to the optical axis and has a positive or negative lens power, and the second lens group is a lens on a plane perpendicular to the optical axis. The image stabilizing lens according to claim 4, wherein the lens is movable in a direction perpendicular to the moving direction of the first lens group, and the lenses of the second lens group have lens powers having signs opposite to those of the first lens group. apparatus.