KR19990019534A - Anti Shake Device of Video Camera - Google Patents

Abstract

Anti-shake of the video camera, which is adopted in a video camera including a housing in which the image capturing element is coupled, and a lens unit including a lens and a barrel surrounding the lens, which is installed in the housing so as to be movable. An apparatus is disclosed.

This disclosed apparatus includes tremor amount detecting means for detecting a tremor amount of a housing; Position sensing means for sensing a relative position of the lens unit with respect to the housing; An arithmetic / control unit which receives the signals output from the shaking amount detecting means and the position detecting means, calculates the relative position of the shaking amount of the housing and the lens unit, and controls the driving position of the lens unit therefrom; It is installed in the housing and the lens unit, the drive means for driving the lens unit in a direction opposite to the shaking direction of the housing receives a signal from the operation / control unit.

Description

Anti Shake Device of Video Camera

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-shake device of a video camera, and more particularly, to an anti-shake device of a video camera, which is capable of preventing a shake of an image captured by a camera shaker's hand.

Recently, with the development of high-density technology and the size and size of the captured image has become smaller, a home video camera has been introduced that allows a photographer to take a picture by hand without a stand such as a tripod.

As described above, a video camera that can be held and photographed by hand has a problem in that the captured image is shaken by the shaking of the photographer, making it difficult to properly photograph.

In view of this, a video camera having a conventional anti-shake device has been disclosed through Japanese Patent Application Laid-Open No. 7-107372.

The anti-shake device of this disclosed video camera was provided with a variable right-angle prism as shown in Figs. 1A to 1C, respectively.

Referring to FIG. 1A, the variable right-angle prism is disposed on an optical path and is composed of a pair of glass plates 11 and 13 and a bellows 14 interposed between the glass plates 11 and 13. The bellows 14 is made of a resin such as polyethylene, and both ends thereof are formed at edges of each of the two glass plates 11 and 13 to form a sealed inner space between the two glass plates 11 and 13. It is fixed and contracted and expanded by external force. A transparent liquid 12 such as silicone oil is sealed in the sealed inner space between the two glass plates 11 and 13 to smoothly drive the two glass plates 11 and 13.

The operation of the variable right-angle prism provided in this way will be described. Referring to FIG. 1B, the two glass plates 11 and 13 are arranged in parallel, and the incident angle and the exit angle of the light beam are the same. Meanwhile, as shown in FIGS. 1A and 1C, when the two glass plates 11 and 13 are disposed to be inclined, light rays are bent at a predetermined angle while passing through the two glass plates 11 and 13.

As described above, the angle adjustment between the two glass plates 11 and 13 detects the degree of hand shaking through a sensor, and the actuator for driving the two glass plates 11 and 13 from the detected signal. Proceed by operating. Accordingly, the angle between the two glass plates, that is, the right angle is adjusted, and the image angle of the imaging screen may be prevented by hand shaking by varying the exit angle with respect to the incident angle of the light beam.

On the other hand, since the bellows 14 is operated by contraction and expansion, there is a risk of breakage when used for a long time, and between the two glass plates 11 and 13 to rotate the two glass plates 11 and 13. Since a transparent liquid 12 such as silicone oil is injected and used, when the bellows 14 is broken, the inside of the video camera is contaminated, which makes it difficult to eliminate the failure.

In addition, it is difficult to assemble and manufacture, because the bellows 14 is connected between the two glass plates 11 and 13 and sealed with the transparent liquid 12 filled therebetween.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described disadvantages, and provides an anti-shake device for a video camera, which is capable of preventing a shake of an image formed on the imaging device by adjusting the position of the lens unit with respect to the imaging device. There is this.

1A to 1C are cross-sectional views showing an anti-shake device of a conventional video camera.

Figure 2 is a schematic cross-sectional view showing a video camera employing the anti-shake device according to the invention.

3 is a view showing the arrangement of the lens unit when the housing of the video camera employing the anti-shake device according to the present invention is disposed inclined with respect to the optical axis.

4 is a schematic view showing an anti-shake device of a video camera according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

30. Housing 40 ... Imager

50 ... lens unit 51 ... lens

53 Transmitter 60 Vibration detection means

61, 62 ... First and second gyroscopes

63, 64, 73, 74 ... first to fourth amplifiers

65, 66, 75, 76 ... First to fourth A / D converters

70 position sensing means

71a, 71b ... first detection sensor

72a, 72b ... second detection sensor

80 ... operation / control unit

90 ... Drive

91, 92 ... first and second magnets

93, 94.First and second yoke

95, 96 ... first and second coil parts

97, 98 ... first and second drive units

In order to achieve the above object, the present invention is adopted in a video camera including a housing in which the image pickup device is coupled, and a lens unit which is installed in the housing so as to be movable and includes a lens and a barrel surrounding the lens. An anti-shake apparatus of a video camera, which is capable of preventing image shaking, comprising: shake amount detecting means for detecting a shake amount of the housing; Position sensing means for sensing a relative position of the lens unit with respect to the housing; An arithmetic / control unit configured to receive the signals output from the shaking amount detecting means and the position detecting means to calculate a relative amount of the shaking amount of the housing and the lens unit, and to control the driving position of the lens unit; And driving means installed in the housing and the lens unit and receiving the signal from the operation / control unit to drive the lens unit in a direction opposite to the shaking direction of the housing.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 to 4, the video camera according to the present invention includes a housing 30, a charge coupled device 40 installed in the housing 30, and a housing 30. It is installed to be movable and comprises a lens unit (50) consisting of a lens (51) and a barrel (53) surrounding the lens (51).

The anti-shake device according to the present invention is formed between the housing 30 and the lens unit 50 to prevent the image from shaking on the image pickup device 40.

The anti-shake device has an angle with respect to the optical axis, as shown in FIG. When the lens unit 50 is inclined as much as possible, the lens unit 50 is moved by an amount compensating for the amount of movement of the housing 30 to correct the amount of vibration, thereby preventing distortion of the image formed on the image pickup device 40.

The anti-shake device includes a shake amount detecting unit 60 for detecting a shake amount of the housing 30 and a position detecting unit 70 for detecting a relative position of the lens unit 50 with respect to the housing 30. And driving means (90) for driving the lens unit (50) in a direction opposite to the shaking direction of the housing (30) from the signal input from the calculation / control unit (80) and the operation / control unit (80). It is configured by.

The vibration detecting means 60 includes a pair of first and second gyroscopes 61 and 62, first and second amplifiers 63 and 64 and first and second installed in the housing 30, respectively. The second A / D converters 65 and 66 are configured.

The first gyroscope 61 detects the amount of vibration in the horizontal direction of the housing 30, and the second gyroscope 62 detects the amount of vibration in the vertical direction of the housing 30. The first and second gyroscopes 61 and 62 are devices widely used in navigation devices for detecting the direction of a moving object, and detailed description thereof will be omitted. Here, each of the first and second gyroscopes 61 and 62 is disposed at different positions with respect to the housing 30, and the vibration amount for any predetermined direction other than the horizontal and vertical vibration amounts is detected. It may be detected, and may be further provided in addition to the first and second gyroscopes 61 and 62 described above. The first and second amplifiers 63 and 64 amplify the signals output from each of the first and second gyroscopes 61 and 62. Each of the first and second A / D converters 65 and 66 converts the analog signals amplified and output from the first and second amplifiers 63 and 64 into digital signals.

The position detecting means 70 may include first and second detection sensors 71a, 71b, 72a, and 72b for detecting a relative position of the lens unit 50 with respect to the housing 30. Quadruple amplifiers 73 and 74 and third and fourth A / D converters 75 and 76;

The first and second detection sensors 71a, 71b, 72a, 72b are installed between the housing 30 and the lens unit 50, respectively, of the lens unit 50 with respect to the housing 30. Detect relative position For example, in one embodiment of the first and second detection sensors (71a, 71b) (72a, 72b), a light emitting device (not shown) for irradiating light to a portion of the surface of the housing facing the lens unit and A light receiving element (not shown) disposed adjacent to the light emitting element is installed, and a reflective member (not shown) having a reflective area and a transmissive area is installed on one surface of the lens unit 50 facing the light emitting and light receiving element. Can be. In this case, the relative position of the lens unit 50 with respect to the housing 30 can be sensed by measuring the phase of the light emitted from the light emitting element and reflected by the reflective member and then received by the light receiving element. do. Each of the third and fourth amplifiers 73 and 74 may include the first and second detection sensors 71a, 71b, 72a and 72b, respectively, and the third and fourth A / D converters 75 and 76, respectively. A) and amplify the signals output from the first and second detection sensors 71a, 71b, 72a, 72b, respectively. The third and fourth A / D converters 75 and 76 convert each of the analog signals output from the third and fourth amplifiers 73 and 74 into digital signals.

The calculation / control unit 80 receives a signal output from the shaking amount detecting means 60 and the position detecting means 70 and determines the relative position of the shaking amount of the housing 30 and the lens unit 50. And the drive position control signal of the lens unit 50 is output therefrom.

The driving means 90 is installed across the housing 30 and the lens unit 50, and receives the signal from the operation / control unit 80 to shake the lens unit 50 with the housing 30. Drive in the opposite direction to compensate for the amount of vibration.

To this end, the driving means 90 is the housing 30 in a position opposite to each of the pair of first and second magnets 91 and 92 and the first and second magnets 91 and 92, respectively. Wound around the first and second bobbins 93 and 94 and the first and second bobbins 93 and 94 respectively opposed to the first and second magnets 91 and 92. The first and second coil parts 95 and 96 and the first and second coil parts (95) so as to correspond to the amount of tremor compensation of the lens unit 50 from the signal input from the operation / control unit 80. It is preferable to include the first and second driving units 97 and 98 for applying a current to each of the 95 and 96. The pair of first magnets 91 are installed to face the barrel 53 in one direction, and the pair of second magnets 92 are different from the first magnets 91 in the barrel 53. Are installed opposite each other.

Hereinafter, the operation of the anti-shake device of a video camera according to an embodiment of the present invention.

First, the shaking of the housing 30 due to the shaking of the hand is detected through the shaking detecting means. That is, the first and second gyroscopes 61 and 62 installed in the housing 30 detect the shaking degree of the housing 30 in the horizontal and vertical directions, and detect the first and second signals. After amplification through the two amplifiers 63 and 64, the first and second A / D converters 65 and 66 are converted into digital signals. The converted signal is input to the calculation / control unit 80.

On the other hand, the position detection means 70 detects the relative position of the lens unit 50 with respect to the housing 30. That is, the first and second detection sensors 71a, 71b, 72a, 72b installed in the housing 30 to be spaced apart from the barrel 53 are perpendicular to the horizontal position of the lens 51. Detect the direction position. Each of these sensed signals is amplified in the third and fourth amplifiers 73 and 74 and then converted into digital signals in each of the third and fourth A / D converters 75 and 76. The converted signal is input to the calculation / control unit 80.

The operation / control unit 80 is the driving means from the vibration amount of the shaking amount detecting means 60 and the position sensing means 70 and the relative position of the vibration of the housing 30 and the lens unit 50. A signal necessary for control of 90 is calculated, and the drive means 90 is controlled therefrom.

From the control signal input from the operation / control unit 80, the first and second driving units 97 and 98 output electrical signals for driving the barrel 53 in the horizontal and vertical directions, respectively. By mutual electromagnetic force between the first and second magnets 91 and 92 provided in the 53 and the first and second coil parts 95 and 96 provided in the first and second bobbins 93 and 94. The lens unit 50 is driven in a direction opposite to the shaking direction of the housing 30.

Therefore, the shaking of the image formed on the image pickup device 40 provided in the housing 30 due to the shaking is corrected by varying the position of the lens unit 50.

The lens correction type anti-shake device according to the present invention is arranged to move the lens unit with respect to the housing, and detects the amount of vibration of the housing and the relative position of the lens unit with respect to the housing in the opposite direction to the vibration direction when the vibration occurs By driving the lens unit, there is an effect that the image blur formed on the image pickup device can be suppressed. The device also fundamentally prevents contamination inside the video camera by eliminating the use of bellows and transparent liquids.

Claims (4)

And a video camera including a housing in which an image pickup device is coupled, and a lens unit configured to be movable in the housing, the lens unit including a lens and a barrel surrounding the lens, to prevent shaking of an image formed on the image pickup device. In the anti-shake device, Shake amount detecting means for detecting a shake amount of the housing; Position sensing means for sensing a relative position of the lens unit with respect to the housing; An arithmetic / control unit configured to receive the signals output from the shaking amount detecting means and the position detecting means to calculate a relative amount of the shaking amount of the housing and the lens unit, and to control the driving position of the lens unit; And a driving means installed in the housing and the lens unit and driving the lens unit in a direction opposite to the shaking direction of the housing by receiving a signal from the operation / control unit. Device. According to claim 1, wherein the shaking amount detecting means, First and second gyroscopes respectively installed at different positions of the housing to detect an amount of shaking of the housing; First and second amplifiers for amplifying signals output from the first and second gyroscopes, respectively; And a first and a second A / D converter for converting each of the analog signals output from the first and second amplifiers into digital signals. The method of claim 1 or 2, wherein the position detecting means, First and second detection sensors respectively installed between the housing and the lens unit to sense a relative position of the lens unit with respect to the housing; Third and fourth amplifiers for amplifying the signals output from the first and second detection sensors, respectively; And a third and fourth A / D converters for converting each of the analog signals output from the third and fourth amplifiers into digital signals. The method of claim 1 or 2, wherein the drive means, A pair of first magnets installed opposite to the barrel in one direction; A pair of second magnets installed on the barrel so as to face each other in a direction different from the first magnets; First and second bobbins installed in the housing at positions opposed to the first and second magnets, respectively; First and second coil parts wound around the first and second bobbins so as to face the first and second magnets, respectively; And a first and second driver configured to apply current to each of the first and second coil parts so as to correspond to the amount of vibration compensation of the lens unit from the signal inputted from the operation / control unit. Anti Shake Device.