KR200190490Y1 - Hand-shake correcting structure for a 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

The present invention for achieving the above object, in the image stabilization structure of the video camera for compensating for the hand shake generated when the incident light irradiated from the subject passes through the zoom lens of the lens barrel provided inside the outer case, the outer shell A housing disposed between an inner circumferential surface of the case and an outer circumferential surface of the lens barrel; A vibration correction unit installed in the housing to drive the entire lens barrel in a rolling and / or pitch direction; And a position detecting sensor for detecting a movement amount and a speed of the lens barrel. Characterized in that it comprises a.

The vibration compensator according to the preferred embodiment of the present invention comprises at least two actuators, one of which is disposed in a direction orthogonal to the other, the actuator being fixed to the yoke and the inner wall surface of one side of the yoke. A magnet is attached, and one end is located in the gap of the yoke, and the other end includes a support fixed to the outer circumferential surface of the lens barrel and a coil wound around the support to generate a magnetic field.

In addition, the position detection sensor according to a preferred embodiment of the present invention consists of a light emitting element provided on the outer peripheral surface of the lens barrel so as to be parallel to the light receiving element provided on the inner peripheral surface of the outer case.

According to this, by compensating for hand shake while driving the entire lens barrel in the rolling and / or pitch direction, the manufacturing cost and assembly process of the correction structure can be reduced to a minimum, the structure is simple, and thinness can be realized. Can be made more efficient, so that an optimal image can be obtained in response to vibration.

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 are side cross-sectional views showing the image stabilization structure according to the present invention, and FIGS. 5 and 6 are cross-sectional views showing a state in which the image pickup device is driven in the pitch direction and the rolling direction by the image stabilizer structure.

Inside the outer case 60 of the imaging device, a lens barrel 64 is provided with a zoom lens 62 that can be linearly moved in order to focus on the imaging device 70b, and a subject behind the lens barrel 64 is provided. An aperture iris 66 and a barrel master 70 having a focus lens 68 are combined to adjust an incident amount of light incident from the light.

A ball joint 70a protrudes from one surface of the barrel master 70 so as to be fitted to the inner wall of the outer case 60, and the camera case 60 and the lens barrel 64 are shaken when shooting a video camera. A shake correction unit is provided for correction, and the shake correction unit is an actuator 80 which can provide driving force to the entire lens barrel 64 in a rolling direction and a pitch direction, and the actuators 80 are provided with at least two lenses. One axis is arranged in a direction orthogonal to the other with respect to the axis of the barrel 64.

The actuator 80 includes a yoke 82 fixed in a housing 72 of an outer case 60, a magnet 84 attached to an inner wall surface of one side of the yoke 82, and a gap between the yoke 82. One end is located in the other end, and the other end is composed of a support 86 fixed to an outer circumferential surface of the lens barrel 64 and a coil 88 for generating a magnetic field by a power applied to one end of the support 86.

On the other hand, a position detecting sensor is provided to detect the movement amount and speed of the lens barrel 64, the position detecting sensor is a light receiving element 74 and the light receiving element 74 fixed to the inner peripheral surface of the outer case 60 The light emitting device 76 is fixed to the outer peripheral surface of the lens barrel (64).

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 controller drives the actuator 80 provided between the housing 72 of the outer case 60 and the lens barrel 64 to compensate for the shaking while the entire lens barrel 64 moves finely in the rolling and pitch directions. . In more detail, the support 86 fixed to the lens barrel 64 is rolled and / or under the influence of the magnetic field caused by the magnet 84 attached to the inner wall surface of the yoke 82 and the power applied to the coil 88. Alternatively, as the lens barrel 64 moves in the pitch direction, the lens barrel 64 moves 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)

In the image stabilization structure of the video camera for compensating for the camera shake caused when the incident light irradiated to the subject passes through the zoom lens of the lens barrel provided inside the outer case A housing disposed between an inner surface of the outer case and an outer circumferential surface of the lens barrel; A vibration correction unit installed in the housing to drive the entire lens barrel in a rolling and / or pitch direction; And a position detection sensor for detecting a movement amount and a speed of the lens barrel. The image stabilization structure of a video camera according to claim 1, wherein the image stabilization unit comprises at least two actuators arranged in a direction orthogonal to the other. The image stabilization structure of a video camera according to claim 1, wherein the position detection sensor comprises a light emitting element provided on an outer circumferential surface of the lens barrel so as to be located parallel to a light receiving element provided on an inner circumferential surface of the outer case. 3. The actuator of claim 2, wherein the actuator comprises: a yoke fixed in the housing; A magnet attached to one inner wall surface of the yoke; A support having one end positioned within the gap of the yoke and the other end fixed to an outer circumferential surface of the lens barrel; And a coil wound around the support to generate a magnetic field.