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7286175 |
Bias control circuitry for cathode ray tube beam currents
Bias control circuitry and method for use in controlling one or more cathode ray tube (CRT) beam currents.
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6771023 |
System and method for regulating cathode ray tube beam current using autobias
A system for regulating beam current in a cathode ray tube. The system includes test signal timing and pulse generation logic for outputting test signals operable to stimulate a cathode ray tube at...
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5892544 |
Beam current detection and control system for a cathode ray tube
The present invention relates to a beam current control system for detecting and controlling a beam current generated by a cathode ray tube. The system comprises a video processing circuit that...
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5550443 |
Automatic beam current control circuit for multimode monitor and method thereof
An automatic beam current control circuit for a multimode monitor provides a high voltage circuit for regulating its output voltage according to a video signal being applied to a cathode ray tube,...
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5394188 |
High voltage stabilizing circuit for use in color television receivers
An anode voltage (high voltage) of a CRT is detected by a voltage division. When it is detected by a comparator that the reduction of the high voltage has exceeded the controlled range of a high...
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5367231 |
Display system
The life time of a CRT is extended by decreasing the temperature of the cathode by 7-30% from the normal operating temperature and by applying a constant voltage signal to a cathode of the CRT...
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4947253 |
Brightness modulator for closed loop compensation of black level
A contrast control circuit develops a video gain control signal for continuously varying the video gain of a video signal to adjust the contrast of the video signal and limit beam current. The...
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4839569 |
Method and apparatus for providing gain control for an image intensifier tube
A photocathode current sensing circuit (58) is provided to adjust the electron accelerating voltage to a cone (32) and a phosphor screen (34) on an image intensifier tube (26). The voltage is...
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4772953 |
Method for processing picture information having a large dynamic range with a television camera tube, and also a device for applying the method
The blooming effect in pictures of a television camera tube (such as a vidicon, an orthicon or an isocon) is counteracted by setting the cathode potential to a first standard value during one scan...
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4763048 |
Method and circuit for controlling the operating point of a video amplifier
When controlling the working point of video output stages in monitors, data display cathode ray tubes (CRTs) (10) and the like, in which the scanning raster is applied to the screen of the CRT...
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4748508 |
Successive approximation type control of the electron beam of a camera tube
Dynamic beam current reserve margin in television camera tubes necessary for the neutralizing of bright spots, which is accumulated on the camera tube signal electrode during a multiplicity of...
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4716468 |
Apparatus for controlling the electron beam in a television camera tube
A camera tube device for use in, for example, a television camera comprises a cathode emitting electrons, and a first grid and a second grid having respective apertures for converging the electrons...
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4701679 |
Method of and apparatus for controlling amount of electron beam in image pickup tube
In an image pickup tube including a cathode, a first grid electrode disposed as a next stage of the cathode and provided with an aperture, a second grid electrode disposed as a next stage of the...
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4698558 |
Image pickup apparatus
Control circuit for use with an image pickup tube permits highlights of an image to be scanned appropriately by a scanning electron beam by increasing the beam current fed to the cathode of the...
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4682077 |
Television camera tube device
A camera tube device for use in a television camera comprises an electron gun including a cathode electrode for emission of an electron beam, and first and second grid electrodes respectively...
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4652910 |
Automatic beam current control with an envelope detector for a color television camera tube with a stripe filter
A feedback control loop for controlling the intensity of a scanning electron beam of an image pickup tube of a color TV camera which is especially useful in a single tube color TV camera with a...
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4638363 |
Automatic beam current control system for television camera
In an image pickup apparatus or television camera tube in which a signal corresponding to a target current of the television camera tube is supplied to its beam current control electrode to thereby...
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4633145 |
Brightness control circuit for display apparatus with color picture tube
A brightness control circuit for a color display tube comprises voltage regulating means for varying a voltage between an input terminal and an output terminal thereof in dependence on an...
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4593321 |
Method of adjusting the current intensity of an electron beam in a pickup tube and television camera system suitable therefor
In a television camera having at least one pickup tube, it is desirable to generate an electron beam with a current intensity which is greater than that necessary for obtaining a picture signal...
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4570184 |
Optimization of vidicon bias lighting
Light biasing of a vidicon target is optimized to effect a consistent rate of response to instantaneous changes in the intensity of light from an object to be imaged. The optimum bias lighting...
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4536799 |
Television method and apparatus
The disclosed technique effectively increases television camera sensitivity by allowing additional time for signal to build up on the photoconductive surface of the camera tube. Rapid motion...
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4503466 |
Apparatus and method for generating optimizing pictures under low light conditions
The scanning process of a television camera is modified so that scanning is inhibited for N successive scan periods and is enabled during the next scan period, in a repeating cycle of (N+1) periods...
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4464680 |
Television camera having automatic focusing device for electron beam of pickup tube
A focusing current or voltage applied to a focusing coil or focusing electrode to focus an electron beam on a target of a camera tube is modulated by a modulation signal so that the focusing...
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4441122 |
Beam current control for television camera
A television camera comprising a control circuit for controlling the electron beam current intensity in a pick-up tube which has a current-controlled electron gun, for example a diode gun. The...
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4427927 |
Apparatus for controlling electron beam of image pickup tube
In an image pick-up tube including a diode-type electron gun having a cathode electrode which emits a scanning electron beam and a control electrode which regulates the current of the electron beam...
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4387403 |
Television camera comprising a control circuit for controlling the intensity of the electron beam current in at least one pick-up tube
A television camera comprises a control circuit for controlling the electron beam current intensity in at least one pick-up tube. To prevent oscillations in a positive feedback control loop, a...
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4380028 |
Television camera equipped with an anti-blooming device
A television camera equipped with a device making it possible to automatically eliminate the blooming effect produced by a saturating bright spot. The device includes a closed loop formed by a...
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4379310 |
Image tube suppression circuit
A suppression circuit processes the video signal from an anti-comet tail (ACT) image pickup tube and develops a control signal indicative of illumination highlights exceeding a predetermined level....
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4365271 |
Television camera having a beam current control circuit
A television camera comprising a control stage and a setting stage for the beam current control of an electron beam in a pick-up tube. Via a video frequency picture signal amplifier suitable for...
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4331980 |
Circuit and method for automatically setting the beam currents in a video camera
The conventional vertical drive sawtooth is modified, during the camera setup mode, to halve the slope thereof for a given field time interval, or intervals, and to double the slope for the...
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4319166 |
Method and apparatus of automatically processing and correcting the blocking voltage of an electron gun
The blocking voltage of an electron gun is corrected by periodically removing an input video signal and driving a cathode with a DC stabilizing voltage. A pulse perturbation is impressed upon a...
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4306251 |
Dynamic beam current control
A dynamic beam current control circuit for a television camera tube features a threshold circuit so that the correction is effected only for large light intensities impinging on the television...
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4259691 |
Beam current control system for image pickup tube
A system for controlling beam current in an image pickup tube so as to prevent comet-tailing and blooming of highlights in the imaged scene. The video signal derived from the image pickup tube (12,...
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4233633 |
Television pick-up device suitable for a discontinuous recording of information during continuous operation
A television pick-up device suitable for a discontinuous recording of information during continuous operation, such as, for example, in X-ray television. When information recording is interrupted...
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4229767 |
Beam control circuit for diode-gun type camera tubes
A beam control circuit which instantaneously increases beam current just sufficiently to discharge a highlight, utilizes the fact that a substantially linear relationship exists between the grid...
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4206480 |
Pick-up tube control circuit
In a circuit for controlling beam current in an image pick-up tube, suitable bias potentials are applied to the photo-conversion layer and the control grid electrode of the image pick-up tube, and...
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4201931 |
Apparatus for protecting the target of an image-producing tube from injuriously high local current densities
The invention contemplates circuit arrangements to protect the target of an image-producing tube from injuriously high local current densities, wherein detector means is responsive to produce an...
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4190865 |
Video image tube highlight suppression circuit
A suppression circuit processes the video signal from an image pickup tube and develops a control signal indicative of the time duration of the illumination highlights. The control signal is...
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4166281 |
Video image highlight suppression circuit with delayed compensation
A suppression circuit processes the video signal from an image pickup tube and develops a control signal indicative of the time duration of the illumination highlights. The control signal is...
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4161755 |
Television pick-up system
In television transmission of medical X-ray photographs and in television X-ray fluoroscopy (e.g. during surgery), where a great brightness contrast range is presented, the illustrated system...
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4151552 |
Automatic beam control circuit responsive to ambient light level having utility in color television camera
An image pickup apparatus provided with a circuit for taking the maximum one of the three signal currents out of three photoconductive pickup tubes and a circuit for obtaining the difference of the...
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4149110 |
Brightness controlled CRT
A cathode ray tube control system comprising a cathode ray type tube having a tubular envelope wherein an electron gun is disposed to direct an electron beam onto a spaced anode target screen, the...
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4141040 |
Video signal amplitude registration system
A video signal amplitude registration system for a television camera is provided in which the video amplitude of two or more related video signals derived from scanning a common reference are...
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3999011 |
Method and system for controlling electron beam quantity in camera tube
A method and system for controlling the quantity of an electron beam in a camera tube in which scanning beam current scans a target electrode to be converted into signal current by the target...
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3975591 |
Electronic camera
An electronic camera with a vidicon tube, comprising a synchronization generator consisting of a frequency divider receiving the frequency of a quartz oscillator (Q 1 ) and supplying, by...
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3975657 |
Method of and apparatus for controlling amount of electron beam in image pickup tube
A method of and an apparatus for controlling the amount of the electron beam in a photoconduction type image pickup tube in which the signal corresponding to the return beam from the photoelectric...
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3974331 |
Low light level image pick-up tube arrangement
A low light level image pick-up tube is protected from excessive illumination intensity damage by controlling a very high voltage assembly supplying the tube. The tube comprises in a preferred...
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3955116 |
Circuit arrangement suitable for use in a television pick-up tube provided with an anti-comet tail electron gun
An automatic control for the optimum control voltage during the line flyback time between the control electrode and the cathode of an ACT gun in a television pick-up tube. A variation in the...
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3919472 |
Automatic target control system for a television camera tube
An automatic target control system for a television camera tube utilizing peak-to-peak detection of developed output signals and a low impedance driving source to enhance the accuracy and speed...
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3848085 |
LOW LIGHT LEVEL TELEVISION CAMERA
A low light level television camera with automatic gain control of the vion output over a wide range of input light level. Cascaded gain mechanisms, avoiding non-linear control by functioning in a...
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