JP3557573B2 - TV camera anti-vibration device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an anti-vibration device for a television camera, and more particularly to an anti-vibration device for a television camera such as a field camera or a studio camera provided with a correction lens for correcting image blur caused by vibration applied to the television camera.
[0002]
[Prior art]
Conventionally, this type of television camera has an angular velocity sensor attached to the television camera, and the angular velocity sensor detects vibration applied to the television camera. The CPU calculates a correction movement amount to be given to the correction lens based on the information indicating the vibration output from the angular velocity sensor, and based on the information indicating the correction movement amount output from the CPU, Corrects the image blur by moving the correction lens in the direction in which the image blur is corrected.
[0003]
[Problems to be solved by the invention]
However, with the conventional TV camera anti-vibration device, the vibration that occurs during the pan / tilt operation of the TV camera by the cameraman is also corrected by the correction lens, so when the cameraman shoots with super slow panning and tilting, it follows There is a drawback that the property becomes worse.
[0004]
Such a problem is caused by the distinction between the sensor output (peak voltage and frequency) of vibration generated during the pan / tilt operation and the sensor output of other vibration (disturbance vibration such as earthquake, traffic vibration, etc.). Although it is conceivable to perform control so as to correct only image blur, it is very difficult to discriminate by frequency in this way, and there is a disadvantage that control cannot be performed.
[0005]
The present invention has been made in view of the above circumstances, and a vibration damping device for a television camera capable of distinguishing vibration generated during pan / tilt operation by a cameraman from disturbance vibration and correcting only image blur caused by disturbance vibration. The purpose is to provide.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a correction lens which is mounted on a camera platform so as to be able to perform pan / tilt operation, corrects image blur, an image blur detecting means for detecting camera shake, and an image blur detecting means. A calculating unit for calculating a correction movement amount to be given to the correction lens based on information from the means, and a driving unit for moving the correction lens in a direction for correcting image blur based on information from the calculating unit. In the image stabilizing device for a television camera, a detection unit for detecting a pan / tilt operation of the television camera is provided, and when a signal indicating the pan / tilt operation is output from the detection unit to the arithmetic unit, the arithmetic unit Is characterized by controlling the driving unit to stop the movement of the correction lens, and correcting image blur due to disturbance vibration without correcting image blur during a pan / tilt operation.
[0007]
According to the present invention, a detection unit for detecting a pan / tilt operation of a television camera is provided, and when a signal indicating the pan / tilt operation is output from the detection unit to the calculation unit, the calculation unit controls the driving unit. Stop the movement of the correction lens. As a result, in the present invention, the vibration generated during the pan / tilt operation by the cameraman is not corrected, and only the image blur due to the disturbance vibration can be corrected.
[0008]
In the present invention, a piezoelectric element is used as the detection unit, and the piezoelectric element is attached to a grip of a pan / tilt operation rod of a camera platform. Thereby, the piezoelectric element is distorted by the pressure applied to the grip from the cameraman's hand during the pan / tilt operation, and the charge generated at that time is output to the arithmetic unit as a signal indicating the pan / tilt operation, and the arithmetic unit is The movement of the correction lens is stopped by controlling the driving unit.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a TV camera vibration isolator according to the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a side view showing an embodiment of a television camera to which the image stabilizer of the television camera according to the present invention is applied. The television camera 10 shown in FIG. 1 includes a lens unit 12 and a camera unit 14 and is fixed to a camera platform 18 fixed on a tripod 16 via a lens support 20. A pan / tilt bar 22 is extended from the pan head 18, and a cameraman grasps a grip 24 provided at the tip of the pan / tilt bar 22 and moves the grip 24 in the up, down, left, and right directions to thereby move the television camera. The pan / tilt operation 10 is performed by the pan head 18. Reference numeral 26 denotes a finder unit of the camera unit 12, and reference numeral 28 denotes a zoom demand.
[0010]
The television camera 10 includes an image stabilizer that corrects image blur caused by vibration applied to the television camera 10. The anti-vibration device includes an angular velocity sensor 30, a CPU 32, a drive circuit 34, a motor 36, a correction lens 38, and the like as shown in FIG. The angular velocity sensor 30 is attached to the lens unit 12 or the camera unit 14 of the television camera 10, and detects a shake (vibration) of the television camera 10. The information (analog signal) indicating the vibration detected by the angular velocity sensor 30 is amplified by an amplifier 40, a high-frequency component signal is cut by a low-pass filter 42, and then converted to a digital signal by an A / D converter 44. Output to the CPU 32. The CPU 32 converts the vibration into an angle amount by integrating the digital signal and calculates a correction movement amount to be given to the correction lens 38. The signal indicating the corrected movement amount is converted into an analog signal by the D / A converter 46 and output to the drive circuit 34. The drive circuit 34 controls the drive of the motor 36 so as to move the correction lens 38 in the direction of correcting image blur based on the analog signal. As a result, the correction lens 38 is moved by the motor 36 in a direction in which image blur is corrected. The movement position of the correction lens 38 is detected by a position sensor 46, and information indicating the movement position is output to the drive circuit 34, and the movement position of the correction lens is feedback-controlled. Therefore, the correction lens 38 is moved to an accurate image blur correction position.
[0011]
By the way, the grip 24 of the pan / tilt bar 22 shown in FIG. 1 incorporates a piezoelectric element (detection unit) 48 as shown in FIG. The piezoelectric element 48 is formed in a ring shape and is fitted to the core rod 50 of the pan / tilt rod 22. The grip 24 that covers the piezoelectric element 48 is formed of rubber, and has a hardness that is elastically deformed by a pressure applied from the cameraman's hand when the cameraman grips the grip 24 and performs the pan / tilt operation of the television camera 10. It is formed with. As a result, during the pan / tilt operation of the television camera 10, pressure applied from the cameraman's hand is applied to the piezoelectric element 48 via the grip 24, and the piezoelectric element 48 is distorted by this pressure to induce electric charge. This charge is output to the A / D converter 54 shown in FIG. 2 via the cable 52 as a voltage signal (analog signal), is converted into a digital signal, and is output to the CPU 32. When a digital signal is output from the A / D converter 54, the CPU 32 controls the drive circuit 34 to stop the movement of the correction lens 38 during that time.
[0012]
Next, the operation of the anti-vibration device for a television camera configured as described above will be described.
First, when disturbance vibration is applied to the television camera 10 in a state where the shooting position is fixed, the vibration is detected by the angular velocity sensor 30. Then, the CPU 32 calculates the amount of correction movement to be given to the correction lens 38, and the correction lens 38 is moved by the motor 36 in the direction in which image blur is corrected. Thereby, the image blur of the camera due to the disturbance vibration is corrected.
[0013]
Next, when the photographing position is changed by panning / tilting the TV camera 10 or the image is intentionally shaken, the pressure applied from the cameraman's hand is applied to the piezoelectric element 48 via the grip 24. . The piezoelectric element 48 is distorted by the pressure, and a voltage signal generated at this time is output to the CPU 32, and the CPU 32 controls the drive circuit 34 to stop the movement of the correction lens 38. As a result, the image blur is not corrected during the pan / tilt operation of the television camera 10.
[0014]
Therefore, in the present embodiment, it is possible to distinguish between the vibration generated during the pan / tilt operation by the cameraman and the disturbance vibration and correct only the image blur caused by the disturbance vibration. In the embodiment of the present invention, the piezoelectric element 48 is used as the pan / tilt operation detecting unit. However, the present invention is not limited to this. For example, instead of the piezoelectric element 48, a touch switch or a switch that is turned on when pressure is applied is attached to the pan / tilt bar 22 near the zoom demand 28, and the photographer operates the switch immediately before the pan / tilt operation. Alternatively, information for performing a pan / tilt operation may be output to the CPU 32.
[0015]
Further, in the present embodiment, the piezoelectric element 48 is built in the grip 24, but may be built in the zoom demand 28.
[0016]
【The invention's effect】
As described above, according to the image stabilizing device for a television camera according to the present invention, a detection unit that detects a pan / tilt operation of the television camera is provided, and a signal indicating the pan / tilt operation is output from the detection unit to the arithmetic unit. Then, the arithmetic unit controls the driving unit to stop the movement of the correction lens, so that the vibration generated during the pan / tilt operation by the cameraman is not corrected, and only the image blur due to the disturbance vibration is corrected. Can be.
[Brief description of the drawings]
FIG. 1 is a side view of a television camera to which a television camera vibration isolator according to the present invention is applied. FIG. 2 is a block diagram of the television camera vibration isolator. FIG. 3 is attached to a grip of a pan / tilt bar. Cross section of piezoelectric element [Explanation of reference numerals]
10 TV Camera 18 Pan Head 22 Pan / Tilt Bar 24 Grip 30 Angular Velocity Sensor 32 CPU
34 drive circuit 38 correction lens 48 piezoelectric element

Claims (2)

A correction lens that is mounted on the camera platform so as to be able to perform pan / tilt operations, corrects image blur, image blur detection means that detects camera shake, and provides the correction lens based on information from the image blur detection means. In an image stabilizing device for a television camera including a calculation unit that calculates a power amount to be corrected and a drive unit that moves the correction lens in a direction that corrects image blur based on information from the calculation unit.
A detection unit for detecting a pan / tilt operation of the television camera; and when a signal indicating the pan / tilt operation is output from the detection unit to the calculation unit, the calculation unit controls the drive unit to perform the correction. An image stabilizing device for a television camera, wherein a movement of a lens is stopped, and an image blur due to disturbance vibration is corrected without correcting an image blur during a pan / tilt operation. The detection unit is a piezoelectric element attached to a grip of the pan / tilt operation rod of the camera platform. Is output to the arithmetic unit as a signal indicating the pan / tilt operation.

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