JPH09244089A - Camera shake correction device and camera shake correction device with lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To regulate the movement of a movable frame when a camera shake correcting function is not used without increasing power consumption by providing a device with a simple-structure lock mechanism. SOLUTION: This camera shake correction device 26 correcting camera shake at a photographing by moving a movable lens 25b by using driving devices 5h and 5v is provided with a lock mechanism 32 consisting of a ferromagnetic member 26v arranged at a movable part 6 including the lens 25b, a moving base 28 freely movably fitted to a fixed part 27 around the member 26v so as to face the movable part 6 and a magnet 31 fixed to the base 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera shake correction device and a camera shake correction device with a lens barrel for correcting a so-called camera shake when an optical device such as a handy type video camera device is used.

[0002]

2. Description of the Related Art This type of image stabilization device and image stabilization device with a lens barrel include an afocal optical system consisting of a convex lens and a concave lens for optical axis correction in front of an image pickup lens system such as a handy type video camera device. The camera shake is prevented by disposing the convex lens and / or the concave lens attached to the movable frame as a lens for use in the movable frame in the direction orthogonal to the optical axis by the driving means.

A lens barrel for accommodating an image pickup lens system is arranged behind the camera shake correction device.
An image sensor (CCD) is arranged behind the lens barrel. Then, the image stabilizing apparatus has its optical system aligned with the optical axis of the imaging lens system in the lens barrel.
It is attached to a video camera device or the like.

Conventionally, the optical axis correcting lens of a camera shake correction device is attached to a movable frame. However, this movable frame is not provided with a lock mechanism, or even if a lock mechanism is provided, a motor or a gear is provided. Was a large-scale arrangement.

[0005]

By the way, in the conventional camera shake correction device, the movable frame is in a free state when the camera shake correction function is unnecessary or when the power is turned off. Therefore, when vibration is applied to the optical device, the movable frame collides with the inside of the device, which impairs the durability of the movable frame and causes rattling and contact noise. In this case, if the power is constantly energized, the movable frame works in conjunction with the coil of the driving device, so that such a problem can be prevented, but there is a problem that the power consumption is large.

On the other hand, in a large-scale lock mechanism in which a motor and gears are arranged, there is a problem that not only the entire device becomes large, the number of parts increases, the manufacturing cost increases, but also the power consumption increases.

The present invention has been made in order to solve the above-mentioned problems, and by providing a lock mechanism having a simple structure without increasing the power consumption, the movement of the movable frame when the image stabilization function is not used is prevented. An object of the present invention is to provide a camera shake correction device and a camera shake correction device with a lens barrel that can be regulated.

[0008]

According to the present invention, the above object is arranged on the object side of an image pickup lens system whose optical axis is to be corrected, and a movable device is moved by a driving device to prevent camera shake during photographing. In a camera shake correction device for correction, a member having ferromagnetism provided in a movable portion including the movable lens and a movable base movably attached to a fixed portion around the movable portion so as to face the movable portion. And a lock mechanism composed of a magnet fixed to the moving base, and by moving the moving base of the lock mechanism, the magnet approaches the movable part and fixes the movable part. This is achieved by the image stabilization device.

Further, a lens barrel for accommodating an image pickup lens system whose optical axis is to be corrected, and a lens barrel which is arranged on the object side of the lens barrel, and a movable lens is moved by a driving device, to correct camera shake during photographing. In a camera-shake correction device with a lens barrel having a camera shake correction device, a ferromagnetic member provided in a movable part including the movable lens and a peripheral fixed part thereof are opposed to the movable part. It is equipped with a lock mechanism consisting of a movable base that is movably attached and a magnet fixed to this movable base.By moving the movable base of this lock mechanism, the magnet approaches the movable part. However, this is achieved by an image stabilization device with a lens barrel, which is characterized in that it is fixed.

According to the present invention, the lock mechanism of the movable frame is
This is a simple structure in which a magnet is fixed on the moving base and a ferromagnetic member is attached to the movable frame of the movable lens. Therefore, when the image stabilization function is not used, if the moving base is moved manually, the magnet approaches the member provided on the movable frame according to the movement of the moving base, and the member has ferromagnetism. It is fixed.

On the other hand, when using the camera shake function, if the movable base is manually returned, the magnet separates from the member in accordance with the return of the movable base, so that the movable part suspension is not forced. Can be easily fixed and separated.

[0012]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The embodiments described below are preferred examples of the present invention, and therefore, various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. The embodiment is not limited to these embodiments unless otherwise stated. The subscripts of "h" or "v" attached to the reference numerals of each member described below indicate that "h" relates to the horizontal (H) direction, and "v" is vertical (V). It indicates that it is related to the direction.

FIG. 1 and FIG. 3 show the structure of a video camera incorporating a camera shake correction device with a lens barrel according to an embodiment of the present invention. 1 and 3
In FIG. 1, the video camera 20 includes a lens barrel 21 having a substantially hollow cylindrical shape, an image pickup lens system 22 mounted in the lens barrel 21, and an image pickup device (CCD) 23 arranged behind the image pickup lens system 22. And an optical image stabilizer 24 disposed in front of the image pickup lens system 22 (on the object side).

The image pickup lens system 22, as shown in FIG.
A four-group ten-lens configuration lens including a three-element first group lens 22a, a three-element second group lens 22b, a one-element third group lens 22c, and a three-element fourth group lens 22d. Therefore, the second group lens 22b and the fourth group lens 22d
Is configured as a zoom lens in which the focal length is changed and the focusing is performed by being moved in the optical axis direction.

The image pickup device (CCD) 23 takes in the image of the subject formed by the image pickup lens system 22 and outputs it as an image signal.

The optical image stabilizer 24 includes an optical axis correcting lens 25 disposed in the optical path in front of the image pickup lens system 22 (on the object side), a vertical driving means 5v and a horizontal driving means 5h ( Only 5v is shown in FIG. 3), and a vertical position sensor 16v and a horizontal position sensor 16h.
(Only 16v is shown in FIG. 3). In the present embodiment, the optical axis correcting lens 25 is composed of an afocal lens and is composed of a correcting concave lens 25a and a correcting convex lens (movable lens) 25b.

FIGS. 4 to 7 show a driving device for the optical axis correcting lens in the embodiment of the present invention. In the figure, reference numeral 1 denotes a drive device for an optical axis correcting lens, which includes a correcting convex lens 25b positioned on the side of the imaging lens system 22 and an correcting convex lens 25b of the optical axis correcting lens 25 formed of an afocal lens. Driving means 5h, 5v for moving the suspensions 4, 4 and the correction convex lens 25b, which are movably supported while keeping the optical axis X ′ thereof parallel to the main optical axis X of the imaging lens system 22, to predetermined positions. And so on.

The correction convex lens 25b is supported by the lens holder 6 as a movable frame and is positioned in front of the image pickup lens system 22, and its optical axis X'is parallel to the main optical axis X of the image pickup lens system 22. Is located as.

The lens holder 6 has a substantially ring shape, and coil bobbins 7h and 7v are provided at the upper and right ends thereof.
Is integrally projecting outward, and mounting pieces 8h and 8v for mounting LEDs of a position sensor, which will be described later, are integrally projecting outwardly at the lower end portion and the left end portion thereof.

Thus, by forming the coil bobbins 7h, 7v and the mounting pieces 8h, 8v on the periphery of the lens holder 6 at substantially equal intervals in the circumferential direction, the center of gravity of the lens holder 6 is held by the correction convex lens 25b. The optical axis can be aligned with the optical axis of, and the overall balance can be improved.

The coil bobbin 7 is composed of two bobbin pieces 7a, 7a which are parallel to each other.
The center of the space between a and a coincides with the radial direction around the axis of the lens holder 6.

The suspension 4 has two vertical spring pieces 9, 9 which are long and horizontal in the front-rear direction and which are vertically spaced from each other, and a front end portion of one side edge of each vertical spring piece 9, 9. And a vertically supported piece 11 which connects between the rear end portions of the respective vertical spring pieces 9, 9 on the side opposite to the supporting piece 10 respectively. Vertically long rectangular holes 10a and 11a are formed at positions close to the vertical spring pieces 9 and 9 of the supported piece 11, respectively. As a result, the vertical spring pieces 9 of the supporting piece 10 and the supported piece 11 are formed.
Narrow horizontal spring pieces 12, 12, ... Are formed at a position closer to 9 and vertically to both upper and lower edges thereof.

The suspension 4 is formed by punching and bending a sheet metal material having a predetermined size. The suspensions 4, 4 formed in this manner have the supported pieces 11, 11 in a direction perpendicular to the left and right side surfaces of the lens barrel of the imaging lens system 22,
In addition, the support pieces 10 and 10 are fixed by screws or the like in a state in which the support pieces 10 and 10 project forward of the imaging lens system 22.

The left and right ends of the lens holder 6 are oriented in a predetermined direction at the tips of the support pieces 10, 10 of the suspensions 4, 4 (the coil bobbin 7 at the upper end extends upward and the mounting piece 8 at the lower end extends downward). ) With screws etc.,
In addition, the spring pieces 9, 9 of the suspensions 4 and 4 ...
, 12, 12, ... Are not bent, and the optical axis X ′ of the correcting convex lens 25 b is aligned with the main optical axis X of the imaging lens system 22.

The driving means 5 is attached to the coil 13 wound around the bobbin pieces 7a, 7a of the coil bobbin 7 of the lens holder 6, a yoke 14 having an E-shaped cross section fixed to the body side (not shown), and the yoke 14. It is composed of magnets 15 and 15.

The yoke 14 is formed such that the center piece 14a thereof is sufficiently smaller than the space between the bobbin pieces 7a of the coil bobbin 7 and 7a, and the middle piece 1a.
4a is arranged at a position where it is loaded from the outside into the space between the bobbin pieces 7a and 7a, and the pieces 14b, 1 at both ends thereof are arranged.
The magnets 15 and 15 are attached to 4b. Then, by feeding power to the coil 13, the lens holder 6 moves in the radiation direction.

Further, such driving means 5h and 5v are arranged at the upper end portion and the right end portion of the lens holder 6, respectively, whereby the driving of the driving means 5v arranged at the upper end portion causes the correction convex lens 25b. Vertically,
By driving the driving means 5h arranged at the right end, the correction convex lens 25b can be moved in the horizontal direction.

Reference numerals 16h and 16v denote position sensors, which are composed of LEDs 17h and 17v attached to the lens holder 6 and PSDs 18h and 18v attached to the main body (not shown). The LEDs 17h and 17v are attached to the attachment pieces 8h and 8v formed at the lower end portion and the left end portion of the lens holder 6 with their light emitting sides facing the image pickup lens system 22 side. The PSDs 18h, 18v are in the form of elongated rectangular plates, the longitudinal direction of which coincides with the emission direction of the imaging lens system 22 about the optical axis X, and the light-receiving surface of which faces the LEDs 17h, 17v. It is arranged in the direction to do.

Reference numerals 19h and 19v (only 19v is shown in FIG. 6) are camera shake detection sensors composed of angular velocity sensors. When camera shake is detected, a shake detection signal is output, and this shake detection signal is angular velocity data. The camera shake amount calculation circuits 36h and 36v (only 36v is shown in FIG. 6) are integrated to detect the change in the angle.

The angle data detected by the camera shake amount calculation circuits 36h and 36v is used as the optical axis correction lens position control circuit 37.
h, 37v (only 37v is shown in FIG. 6) is compared with the position data of the correcting convex lens 25b obtained by the position sensor 16h or 16v, the amount of angle to be corrected is detected, and this correction data is It is outputted to the driving means 5h or 5v, and the correction convex lens 25b is moved vertically or horizontally to correct the optical axis.

When a camera shake occurs, the camera shake detection sensors 19h and 19v detect the camera shake, and the obtained angular velocity data is calculated by the camera shake amount calculation circuits 36h and 36v as a change amount of the angle.

On the other hand, the position data of the correcting convex lens 3 obtained by the position sensors 16h and 16v and the above angle data are compared by the optical axis correcting lens position control circuits 37h and 37v, and the amount of angle to be corrected is determined. The calculated driving current is supplied to the coils 13h and 13v of the driving means 5h and 5v.

Then, for example, when power is supplied to the coil 13v of the vertical driving means 5v, the correction convex lens 3 is moved in the vertical direction, and the vertical spring pieces 9, 9 ,. -Is bent, and the relative positional relationship between the LED 17v of the vertical position sensor 16v and the PSD 18v is deviated, and the position closed-loop servo control is performed so that this position data becomes a target value.

The position of the correcting convex lens 25b in the horizontal direction is also subjected to closed-loop servo control similarly to the position in the vertical direction.
4, the horizontal spring pieces 12, 12, ... Bend.

When the camera shake has vertical and horizontal components, the two position closed loop servo controls work, and the suspensions 4 and 4 are bent simultaneously in the vertical and horizontal directions.

When the correcting convex lens 25b rolls, the PSD 18 of the position sensors 16h and 16v is moved.
Since the h and 18v are arranged so that the longitudinal direction thereof coincides with the radiation direction of the imaging lens system 22, the LEDs 17h and 17v
Since v only moves in a direction substantially orthogonal to the PSDs 18h and 18v and does not move in the longitudinal direction of the PSDs 18h and 18v, this state is corrected by the correction convex lens 25b.
It is not mistaken for the movement of the radial direction (see FIG. 7).

FIG. 2A is a vertical sectional view showing the internal structure of the image stabilizing apparatus according to the present embodiment, and FIG.
FIG. 4 is a schematic view of the lock mechanism according to the present embodiment as seen from below. 2A and 4A, the coil bobbin 7h is attached to the horizontal mounting piece 8h and the vertical mounting piece 8v of the lens holder 6 as the movable frame.
Balancer 26 for balancing gravity with the coil 13, the yoke 14, the magnet 15 and the like provided in the 7v.
h and 26v are attached respectively. The balancers 26h and 26v are formed of a material having ferromagnetism such as an iron-based material of JIS standard S45C. Here, ferromagnetism refers to the property of being strongly attracted to a magnet and having strong magnetism even after being separated from the magnet.

A movable base 28 (see FIG. 2) is provided on a fixed frame 27 in the vicinity of the balancer 26v located below the image stabilizing device 24 so as to face the lens holder 6.
Is movably mounted. Specifically, the moving base 28 is formed by a disc-shaped rotating plate that is rotatably attached. The rotating plate 28 is rotatably attached to a fixed frame 27 as a fixed portion by pivotally supporting a central portion of the rotating plate 28 via a spring washer 29.

The mounting position of the rotary shaft 30 of the rotary plate 28 is slightly biased toward the front (object side) from the position corresponding to the balancer 26v, and the plate portion around it is located directly below the balancer 26v. It is like this. The plate portion around the rotary shaft 30 has a convex portion 28a which serves as a manual knob.
The magnet 31 is housed and fixed inside the convex portion 28a.

That is, the lock mechanism 32 provided in the camera shake correction device 24 according to the embodiment of the present invention is attached to the lens holder (movable frame) 6 which supports the optical axis correction lens 25b which is a movable lens. A balancer 26v having ferromagnetism, a fixed frame 27 near the balancer 26v, a rotary plate 28 rotatably attached to the lens holder 6 so as to face the lens holder 6, and a magnet fixed to the rotary plate 28. It has a simple structure including 31 and 31.

When the camera shake correction function is not used, that is, when the photographing is stopped or finished and the power is turned off, the driving device 5
Since there is no power to h and 5v, the optical axis correction lens 2
The lens holder 6 supporting 5b is in a freely movable state. Therefore, when the convex portion 28a of the rotary plate 28 is picked with a finger and the rotary plate 28 is manually rotated a half turn from the initial position,
The magnet 31 approaches the balancer 26v attached to the lens holder 6 according to the rotation of the rotary plate. This balancer 26v is, for example, JIS standard S45C.
Since it is formed of a material having ferromagnetism such as
The magnet 31 attracts the balancer 26v and fixes it to the fixed frame 27. Therefore, the movement of the lens holder 6 supporting the optical axis correcting lens 25b is restricted by this lock mechanism.

On the other hand, when the camera shake function is used, that is, when the video camera 20 is shooting, the convex portion 28a of the rotary plate 28 is used.
When the rotary plate 28 is rotated halfway and returned to the initial position, the magnet 31 is separated from the balancer 26v according to the rotation of the rotary plate 28, and the attraction by the magnet 31 is released.

As described above, the lens holder 6 is movably supported by the suspensions 4 and 4.
Since the magnetic force of the magnet 31 does not act on the suspensions 4 and 4, it is possible to easily fix and separate the movable parts without applying an excessive force to the suspensions 4 and 4 of the movable parts.

In the present embodiment, the moving base 28 is composed of the rotary plate that rotates around the rotary shaft 30, but the present invention is not limited to this, and it is composed of a linear mechanism that slides. May be. Further, in the present embodiment, the fixed frame 2 near the vertical balancer 26v
Although the movable base 28 is attached to No. 7, it is not limited to this, and it goes without saying that the movable base 28 may be attached to the fixed frame 27 near the horizontal balancer 26h.

Thus, according to the present embodiment, when the camera shake correction is not used, the lens holder 6 can be fixed with one touch by the lock mechanism 32 having a simple structure, instead of energizing and holding the lens holder 6. Therefore, low power consumption can be achieved. In addition, since the lens holder 6 can be fixed when the power is off, the lens holder 6 does not collide with the inside of the device, and it is not necessary to increase the frame thickness as a countermeasure against damage or to attach a shock absorbing material, and the contact noise can be prevented. Does not occur. Furthermore, since the lock mechanism 32 has a simple structure and is small and lightweight, it is possible to reduce the size of the image stabilizing apparatus as a whole. In addition, since the number of parts constituting the lock mechanism 32 is small, the manufacturing cost can be low.

[0046]

As described above, according to the image stabilization apparatus and the image stabilization apparatus with a lens barrel according to the present invention,
By providing the lock mechanism having a simple structure without increasing the power consumption, the movement of the movable frame can be regulated when the image stabilization function is not used.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external configuration of a video camera incorporating a camera shake correction device according to the present invention.

FIG. 2A is a vertical cross-sectional view showing the internal structure of the image stabilizing apparatus according to the present embodiment, and FIG. 2B is a schematic view of the lock mechanism according to the present embodiment as viewed from below.

FIG. 3 is a vertical cross-sectional view showing the internal structure of a video camera incorporating the image stabilization apparatus according to the present invention.

FIG. 4A is a front view showing a drive device for an optical axis correcting lens in the present embodiment, and FIG. 4B is a vertical sectional view thereof.

FIG. 5 is an exploded perspective view showing a drive device for an optical axis correcting lens in the present embodiment.

FIG. 6 is a schematic diagram showing an overall configuration of a drive device for an optical axis correcting lens according to the present embodiment as viewed from the side.

FIG. 7 is a schematic diagram for explaining the positional relationship between the light emitting unit and the light receiving element when the optical axis correcting lens in this embodiment rolls.

[Explanation of symbols]

6 ... Lens holder (movable frame), 24 ... Image stabilizer, 25 ... Optical axis correcting lens, 25a ... Optical axis correcting concave lens, 25b ... Optical axis correcting convex lens (movable) Lens), 26h, 26v ... balancer, 27
... Fixed frame, 28 ... Movable base (rotating plate), 28 ...
..Convex parts, 29 ... Spring washers, 30 ...
Rotating shaft, 31 ... Magnet, 32 ... Lock mechanism

Claims (3)

[Claims] 1. A camera shake correction device which is disposed on the object side of an image pickup lens system to be optical axis corrected and corrects a camera shake during shooting by moving a movable lens by a drive device. A member having a ferromagnetic property, a movable base movably attached to the fixed portion around the member so as to face the movable portion, and a magnet fixed to the movable base. A camera shake correction device comprising a lock mechanism, wherein the magnet moves toward a movable portion and is fixed by moving a moving base of the lock mechanism. 2. The image stabilizing device according to claim 1, wherein the member having ferromagnetism is a balancer, the fixed portion is a fixed frame, and the movable base is a rotary plate. 3. A lens barrel for housing an imaging lens system whose optical axis is to be corrected, and a lens barrel which is arranged on the object side of the lens barrel and which moves a movable lens by a driving device to correct camera shake during photographing. In a camera shake correction device with a lens barrel having a camera shake correction device, a ferromagnetic member provided in a movable part including the movable lens and a fixed part around the movable part are opposed to the movable part. It is equipped with a lock mechanism consisting of a movable base that is movably attached and a magnet that is fixed to this movable base.By moving the movable base of this lock mechanism, the magnet approaches the movable part. Then, the image stabilizer with a lens barrel is characterized in that it is fixed.