KR19990013837U - Image stabilization structure of video camera - Google Patents

Abstract

The present invention relates to a camera shake correction structure, the master is fixed to the inner surface of the outer case, the master and the lens barrel is provided with a shake correction for driving the entire lens barrel in the rolling and / or pitch direction On one side of the vibration correction unit, a position detection sensor is provided to detect movement and speed of the lens barrel, thereby compensating for hand movement, thereby reducing manufacturing cost and assembly process of the correction structure to a minimum. It is simple and the thickness can be realized, and in particular, image stabilization can be more efficiently performed, and thus an optimum image can be obtained in response to vibration.

Description

Image stabilization structure of video camera

The present invention relates to a shake compensation structure of a video camera, and more particularly, by finely driving the entire lens barrel in the rolling and / or pitch direction, it is possible to correct vibrations caused by shaking and to obtain an optimal image. An image stabilization structure of a video camera capable of compacting the size of a camera is provided.

In general, a video camera including a mobile phone and a camcorder capable of transmitting a moving picture is a device that is designed to be compact and lightweight for a user to carry, record an image on a recording medium, and immediately play the recorded image. This is a common and widely used trend. However, video cameras usually carry a handheld object and thus inevitably cause camera shake, which often causes the image to be disturbed.

In order to solve such a disadvantage, conventionally, as shown in FIGS. 1 and 2, there is provided a VAP (Variable Angled Prism) image stabilization structure using glass that is curved in a rolling and / or pitch direction.

That is, the frame 14 is coupled to the front surface of the cylindrical lens barrel 12 on which the lens unit 10 is mounted, and then a pair of circular plate glass 18 connected to the frame 14 by film bellows 16. The voice coil motor 22 is installed to be orthogonal to each other to fix one end of the glass 18 and to drive the glass 18 in a pitch direction and a rolling direction on both surfaces of the at least one glass 18. Then, a high refractive index liquid silicon 20 is injected between the pair of glasses 18 and then sealed.

Then, when the image of the subject or the object is taken, the light irradiated from the subject passes through the zoom lens 12a mounted inside the lens barrel 12 and reaches the image pickup device 12b. At this time, when hand shake occurs in the video camera when capturing an image of the subject, as the voice coil motor 22 is driven, the grass 18 moves in the rolling and / or pitch direction to compensate for hand shake.

In other words, when the power is applied to the voice coil motor 22, the film is supported by the magnet 26 attached to the inner wall surface of the yoke 24 and the support 30 which moves linearly under the influence of the magnetic field generated by the coil 28. The pair of glasses 18 connected to the bellows 16 finely moved to compensate for shaking.

Meanwhile, FIG. 3 is a diagram illustrating another conventional correction structure for compensating for hand shake, and a mirror type tremble compensator (MTC) scheme, which is a hand shake correction structure using a mirror, is provided.

That is, the barrel 40 is installed at an angle in front of the lens unit 10 of the lens barrel 12, and the mirror 40 includes a mirror 42 in front of the barrel 40 for reflecting light from a subject. The holder 44 is mounted, and the barrel 40 and the mirror holder 44 are provided with the actuator 46 having the same configuration so as to be able to freely drive the mirror 42 in the rolling and pitch directions so as to be perpendicular to the rolling and pitch directions. Install.

As described above, in the case of correcting hand shake caused when photographing a subject with a correction structure installed in front of the lens barrel 12, the hand shake is detected by a rolling and pitch sensor (not shown), and the signal is output to the controller. The controller converts the output signal into an operation signal to drive the actuators 46 installed in the rolling and pitch directions, respectively, to fine-tune the mirror holder 44 and the mirror 42 attached to the front thereof in the rolling and / or pitch directions. The camera shake was corrected while driving freely.

However, in the case of the VAP method used to compensate for hand shake as described above, since high refractive index liquid silicon is injected between a pair of glass plates and then connected with a film bellows, the cost of using an expensive silicon liquid is high. Of course, there was a problem that a separate assembly process for assembling the glass is required.

In addition, in the MTC system, since the correction structure is inclined at a certain angle in front of the lens barrel, the overall size of the video camera cannot be reduced and thinning is impossible. There was a problem that a separate circuit device is needed to correct it.

The present invention is to solve the above problems, an object of the present invention is to provide a camera shake correction structure that can compensate for camera shake while driving the entire lens barrel in the rolling and / or pitch direction.

Another object of the present invention is to drive the lens barrel to compensate for hand shake, which can reduce the manufacturing cost and assembly process of the correction structure to a minimum, and the structure is simple, so that the thinness can be realized, and in particular, the hand shake correction is more efficient. The present invention provides a video camera shake correction structure capable of obtaining an optimal image in response to vibration.

1 is a side cross-sectional view showing a shake compensation structure of a video camera according to the prior art,

2 is an enlarged cross-sectional view of the main portion of the image stabilizer structure shown in FIG. 1;

Figure 3 is a side cross-sectional view showing another embodiment of the image stabilization structure of a conventional video camera,

Figure 4a is a side cross-sectional view showing a shake correction structure of a video camera according to the present invention,

4B is a cross-sectional view of the image stabilizer structure shown in FIG. 4A;

5 is a cross-sectional view showing a state in which the image pickup device is driven in the pitch direction by the camera shake correction structure according to the present invention,

6 is a cross-sectional view showing a state in which the image pickup device is driven in the rolling direction by the camera shake correction structure according to the present invention.

Explanation of symbols on the main parts of the drawings

60: outer case 62: zoom lens

64: lens barrel 66: aperture

68: Focus Lens 70: Barrel Master

70a: ball joint 70b: image pickup device

72: master 74,76: light receiving and light emitting element

80: actuator 82: yoke

84: magnet 86: support

88: coil

A feature of the present invention for achieving the above object is a lens barrel equipped with a zoom lens is provided inside the outer case, the barrel master having a focus lens for focusing the light irradiated from the subject behind the lens barrel is coupled. In the image stabilization structure of the video camera is provided in the outer case and the lens barrel to correct the hand shake generated when the incident light passes through the zoom lens, the master is fixed to the inner surface of the outer case, The master and the lens barrel are provided with a shake compensator for driving the entire lens barrel in a rolling and / or pitch direction, and a position detecting sensor is provided at one side of the shake compensator to detect the amount and speed of movement of the lens barrel. Achieved by being equipped.

The vibration compensator according to the preferred embodiment of the present invention is achieved by having two actuators installed to be orthogonal to each other with respect to the lens barrel.

The position sensor according to a preferred embodiment of the present invention is achieved by a light receiving element fixed to the outer case and a light emitting element fixed to the lens barrel to be positioned in parallel to the light receiving element.

Hereinafter, a preferred embodiment of the image stabilization structure of the video camera of the present invention will be described in detail with reference to the accompanying drawings.

4A and 4B illustrate a camera shake correction structure according to the present invention, wherein a lens barrel having a zoom lens 62 that is linearly movable in order to focus on an image pickup device is mounted inside the outer case 60 of the image pickup apparatus. 64 is provided, and a barrel master 70 having an aperture iris 66 and a focus lens 68 is coupled to the rear thereof so as to adjust an incident amount of light incident from the subject.

On one surface of the barrel master 70, a ball joint 70a protrudes so as to be fitted to the inner wall of the outer case 60, and the outer case 60 and the lens barrel 64 are shaken when shooting a video camera. A vibration compensator is provided for correction, and the vibration compensator is provided with an actuator 80 having the same configuration to provide the driving force in the rolling direction and the pitch direction of the entire lens barrel 64, and the actuator 80 is a lens. The barrel 64 is installed to be perpendicular to each other.

The actuator 80 includes a yoke 82 fixed in the master 72 of the outer shell case 60, a magnet 84 attached to an inner wall thereof, and a lens barrel 64 so that one end thereof is positioned in the air gap of the yoke 82. ) Is composed of a support 86 fixed to an outer circumferential surface and a coil 88 for generating a magnetic field by a power applied to one end of the support 86.

A position detecting sensor is fixed to one side of the actuator 80 so as to detect the movement amount and speed of the lens barrel 64, and the position detecting sensor is a light receiving and light emitting element fixed to the outer case 60 and the lens barrel 64. (74) and (76).

When described in detail with reference to Figures 5 and 6 the operation of the image stabilization structure according to the present invention configured as described above.

The light irradiated from the subject passes through the zoom lens 62 and the focus lens 68 and reaches the image pickup device 70b to form an image. At this time, when vibration is generated in the video camera due to camera shake during image capture of the projectile, the vibration is detected by an angular velocity sensor (not shown), and then the detected signal is transmitted to the controller (microcomputer).

Then, the control unit drives the two actuators 80 provided in the rolling and pitch directions of the master 72 and the lens barrel 64 of the outer case 60, so that the entire lens barrel 64 is fine in the rolling and pitch directions. To compensate for vibration. That is, the support 86 fixed to the lens barrel 64 by the magnet 84 attached to the inner wall surface of the yoke 82 and the magnetic field by the power applied to the coil 88 is in the rolling and / or pitch direction. As it moves to the lens barrel 64 is to move around the ball joint (70a) fitted to the outer case 10.

At this time, the direction and angle of movement of the lens barrel 64 is recognized as a displacement amount by the light receiving and light emitting elements 74 and 76 fixed to the outer case 60 and the lens barrel 64 to roll the lens barrel 64. And / or it is possible to correct the shaking caused when shooting the image of the subject while controlling the pitch direction and angle.

As described above, according to the image stabilization structure of the video camera according to the present invention, by reducing the camera shake while driving the entire lens barrel in the rolling and / or pitch direction, it is possible to reduce the manufacturing cost and assembly process of the correction structure to a minimum In addition, the structure is simple, so that the thinning can be realized, and in particular, the camera shake correction can be more efficiently, and thus an optimum image can be obtained in response to vibration.

The present invention is not limited to the above-described specific preferred embodiments, and any person having ordinary skill in the art to which the present invention pertains may make various modifications without departing from the gist of the present invention claimed in the claims. Of course, such changes will fall within the scope of the claims.

Claims (4)

A lens barrel equipped with a zoom lens is provided inside the outer case, and a barrel master having a focus lens for focusing light irradiated from a subject is coupled to the rear of the lens barrel, and is installed in the outer case and the lens barrel to receive incident light. In the camera shake correction structure of the video camera provided to correct the camera shake caused when passing through the zoom lens, A master is fixed to an inner surface of the outer case, and a vibration compensator for driving the entire lens barrel in a rolling and / or pitch direction is provided on the master and the lens barrel, and on one side of the vibration compensator, the movement of the lens barrel is provided. Image stabilization structure of a video camera, characterized in that the position sensor is provided to detect the amount and speed. The image stabilization structure of a video camera according to claim 1, wherein the vibration compensator comprises two actuators installed to be orthogonal to each other with respect to the lens barrel. The image stabilization structure of a video camera according to claim 1, wherein the position detecting sensor comprises a light receiving element fixed to the outer case and a light emitting element fixed to the lens barrel so as to be parallel to the light receiving element. The support and the support of claim 2, wherein the actuator has a yoke fixed in the master, a magnet attached to an inner wall surface of the yoke, and one end fixed to an outer circumferential surface of the lens barrel such that one end thereof is positioned in an air gap of the yoke. Image stabilization structure of a video camera, characterized in that provided as a coil for winding to generate a magnetic field.