JPH0993483A - Vibration-proof device for television camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To correct only camera-shake due to external disturbing vibration by providing a detection section to detect panning-tilting operation of the television camera, and allowing an arithmetic section to control a drive section of the vibration-proof device so as to stop the movement of a correction lens when a signal representing panning-tilting operation from the detection section is outputted to the arithmetic section of the vibration-proof device thereby not correcting camera-shake by the panning-tilting operation of a cameraman. SOLUTION: A piezoelectric element 48 is built in a grip 24 of a panning-tilt rod 22. The grip 24 covering the piezoelectric element 48 is made of a rubber and elastically deformed with a pressure exerted by a hand of a cameraman when the cameraman holds the grip 24 to make panning-tilting operation for a television camera 10. Thus, in the case of the panning-tilting operation, the pressure exerted from the hand of the cameraman is delivered to the piezoelectric element 48 via the grip 24, the piezoelectric element 48 is deformed to induce electric charges and the charge is outputted to a CPU 32 as a voltage signal. The CPU 32 receiving the voltage signal controls a drive circuit 34 to stop the movement of a correction lens.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image stabilizer for a television camera, and more particularly to an image stabilizer for a television camera such as a field camera or a studio camera equipped with a correction lens for correcting image blur caused by vibration applied to the television camera. Regarding the device.

[0002]

2. Description of the Related Art Conventionally, this type of television camera has an angular velocity sensor attached to the television camera, and the angular velocity sensor detects a vibration applied to the television camera. Then, the CPU calculates the correction movement amount to be given to the correction lens based on the information indicating the vibration output from the angular velocity sensor, and the drive unit 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 for correcting the image blur.

[0003]

However, in the conventional anti-vibration device for the television camera, the camera lens also corrects the vibration generated during the pan / tilt operation of the television camera by the cameraman, so that the cameraman pans at an extremely slow speed. However, when shooting with tilting, there is a drawback that the followability deteriorates.

Such a problem is caused by a sensor output (peak voltage, frequency) of vibration generated during pan / tilt operation.
It is conceivable to distinguish between the sensor output of other vibrations (disturbance vibration such as earthquake and traffic vibration) and the sensor output so as to correct only the image shake due to the disturbance vibration. It has the drawback of being very difficult and out of control.

The present invention has been made in view of the above circumstances, and a television camera capable of correcting the image blur caused by the disturbance vibration by distinguishing the vibration generated during the pan / tilt operation by the cameraman from the disturbance vibration. It is an object to provide a vibration isolation device.

[0006]

In order to achieve the above object, the present invention is mounted on a pan head so that pan / tilt operation is possible, and a correction lens for correcting image blur and a camera shake are detected. An image blur detection unit, a calculation unit that calculates a correction movement amount to be given to the correction lens based on information from the image blur detection unit, and the correction lens in a direction that corrects image blur based on information from the calculation unit. In a vibration isolation device for a television camera including a drive unit for moving the camera, a detection unit for detecting 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 image blur is not corrected during the pan / tilt operation, and the image blur of the disturbance vibration is corrected. thing And it features.

According to the present invention, a detection unit for detecting the pan / tilt operation of the television camera is provided, and when the detection unit outputs a signal indicating the pan / tilt operation to the operation unit, the operation unit causes the drive unit to operate. Control to 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, but only the image blur due to the disturbance vibration can be corrected.

Further, according to the present invention, a piezoelectric element is used as the detecting portion, and the piezoelectric element is attached to the grip of the pan / tilt operating rod of the platform. As a result, the piezoelectric element is distorted by the pressure applied to the grip from the cameraman's hand during the pan / tilt operation, and the electric charge generated at that time is output to the arithmetic unit as a signal indicating the pan / tilt operation. The drive unit is controlled to stop the movement of the correction lens.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a vibration isolator for a television camera according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a side view showing an embodiment of a television camera to which a vibration isolation device for a television camera according to the present invention is applied.
The television camera 10 shown in the figure is composed of a lens unit 12 and a camera unit 14, and a platform 18 fixed on a tripod 16.
It is fixed to the lens via a lens support 20. A pan / tilt rod 22 is extended from the platform 18 to
When the camera operator grips a grip 24 provided at the tip of the tilt rod 22 and moves it vertically and horizontally, the television camera 10 is panned and tilted by the platform 18. Reference numeral 26 is a finder portion of the camera portion 12, and reference numeral 28 is a zoom demand.

The television camera 10 is the television camera 1.
It has an anti-vibration device that corrects the image blur caused by the vibration applied to zero. As shown in FIG. 2, the vibration isolation device includes an angular velocity sensor 30, a CPU 32, a drive circuit 34, and a motor 3.
6, and the correction lens 38 and the like. 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 the amplifier 40, the high frequency component signal is cut by the low pass filter 42, and then converted into a digital signal by the A / D converter 44. Is output to the CPU 32. CPU32
Calculates the correction movement amount to be given to the correction lens 38 by converting the vibration into an angle amount by integrating the digital signal. The signal indicating this corrected movement amount is D / A
Converted into an analog signal by the converter 46 and driven by the drive circuit 3
4 is output. The drive circuit 34 drives and controls the motor 36 so as to move the correction lens 38 in the direction for correcting the image blur based on the analog signal. This allows
The correction lens 38 is moved by the motor 36 in a direction for correcting the image blur. Further, the movement position of the correction lens 38 is detected by the position sensor 46, 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 the correct image blur correction position.

By the way, the pan / tilt bar 2 shown in FIG.
As shown in FIG. 3, the second grip 24 has a built-in piezoelectric element (detection unit) 48. 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 the pressure applied from the cameraman's hand when the cameraman holds the grip 24 and pans and tilts the television camera 10. Is formed by. As a result, during the pan / tilt operation of the television camera 10, the pressure applied from the hand of the cameraman is applied to the piezoelectric element 48 via the grip 24, and the piezoelectric element 48 is distorted by this pressure and an electric charge is induced. This charge is output as a voltage signal (analog signal) to the A / D converter 54 shown in FIG. 2 via the cable 52, then converted to a digital signal and output to the CPU 32. When the 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.

Next, the operation of the image stabilizing device for the television camera constructed as described above will be described. First, when disturbance vibration is applied to the television camera 10 in a state where the photographing position is fixed, the vibration is detected by the angular velocity sensor 30. Then, the CPU 32 calculates a correction movement amount to be given to the correction lens 38, and the correction lens 38 causes the motor 36 to move.
To move in the direction to correct the image blur. This allows
Image blur of the camera due to disturbance vibration is corrected.

Next, when the television camera 10 is panned / tilted to change the photographing position, or when an image is intentionally photographed in a blurred state, the pressure applied from the photographer's hand is applied to the piezoelectric element via the grip 24. Join 48. The piezoelectric element 48 is distorted by the pressure, and the voltage signal generated at this time is output to the CPU 32, and the CPU 32 causes the drive circuit 34 to operate.
Is controlled 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.

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 to 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 detection unit, but the present invention is not limited to this. For example, instead of the piezoelectric element 48, a touch switch that is turned on when pressure is applied, or a switch is attached near the zoom demand 28 of the pan / tilt rod 22, and a cameraman operates the switch immediately before the pan / tilt operation. Information for performing the pan / tilt operation may be output to the CPU 32.

Further, in this embodiment, the piezoelectric element 48 is built in the grip 24, but it may be built in the zoom demand 28.

[0016]

As described above, according to the anti-vibration device for a television camera of the present invention, a detection unit for detecting the pan / tilt operation of the television camera is provided, and the pan / tilt detection unit detects the pan / tilt operation.
When the signal indicating the tilt operation is output to the calculation unit, the calculation unit controls the drive 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, Only image blur due to disturbance vibration can be corrected.

[Brief description of drawings]

FIG. 1 is a side view of a television camera to which a vibration isolation device for a television camera according to the present invention is applied.

FIG. 2 is a block diagram of a vibration isolation device for a TV camera.

FIG. 3 is a sectional view of a piezoelectric element attached to a grip of a pan / tilt bar.

[Explanation of symbols]

 10 ... Television camera 18 ... Platform 22 ... Pan / tilt bar 24 ... Grip 30 ... Angular velocity sensor 32 ... CPU 34 ... Drive circuit 38 ... Correction lens 48 ... Piezoelectric element

Claims (2)

[Claims] 1. A correction lens which is mounted on a platform so as to be capable of pan / tilt operation, and which corrects image blur, image blur detection means for detecting camera blur, and information based on information from the image blur detection means. An image stabilizer for a television camera, comprising: a calculation unit that calculates a correction movement amount to be given to the correction lens; and a drive unit that moves the correction lens in a direction for correcting image blur based on information from the calculation unit. In the above, a detection unit that detects the pan / tilt operation of the television camera is provided, and when the detection unit outputs a signal indicating the pan / tilt operation to the calculation unit, the calculation unit controls the drive unit. The image stabilizing apparatus for a television camera is characterized in that the movement of the correction lens is stopped so that the image blur is not corrected during the pan / tilt operation, and the image blur of the disturbance vibration is corrected. 2. The detection unit is a piezoelectric element attached to a grip of a pan / tilt operation rod of the platform, and the piezoelectric element is distorted by a pressure applied to the grip from a cameraman's hand during pan / tilt operation. 2. The image stabilizing device for a television camera according to claim 1, wherein the electric charge generated at that time is output to the arithmetic unit as a signal indicating the pan / tilt operation.