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| Number | Title | Issue Date |
| 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. ... | 10/23/2007 |
| 7187414 | Circuit for stabilizing high tension voltage of CRT, and method thereof Disclosed is a circuit for stabilizing a high tension voltage of a CRT and a method thereof. A feedback unit receives a cutoff voltage from the CRT. A compensating unit calculates a variation quantity of the cutoff voltage on the basis of the cutoff voltage from the... | 03/06/2007 |
| 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 two voltage levels. The system further includes a circuit that input... | 08/03/2004 |
| 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 receives a first signal, and which generates a second signal ... | 04/06/1999 |
| 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, a luminance data compensator having an analog-to-digital (... | 08/27/1996 |
| 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 voltage stabilizing loop, two switches will be on. When one ... | 02/28/1995 |
| 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 which is shifted from a first voltage level for displaying the... | 11/22/1994 |
| 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 contrast control circuit may comprise an auto contrast control... | 08/07/1990 |
| 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 adjusted by an anode power supply (60) which is responsive to t... | 06/13/1989 |
| 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 of the scanning electron beam and to a second value during... | 09/20/1988 |
| 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 entirely on the visible portion of the screen, and to permit c... | 08/09/1988 |
| 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 successive picture field periods after which a signal electrod... | 05/31/1988 |
| 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 emitted from the cathode into a fine electron beam. The a... | 12/29/1987 |
| 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 first grid electrode and provided with an aperture, and a ph... | 10/20/1987 |
| 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 image pickup tube and prevents unwanted oscillations typicall... | 10/06/1987 |
| 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 having apertures for controlling the diameter of the electron b... | 07/21/1987 |
| 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 stripe filter, comprises an envelope detector for detecting t... | 03/24/1987 |
| 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 control the beam quantity to become corresponding to the ... | 01/20/1987 |
| 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 externally supplied voltage control signal are provided between cat... | 12/30/1986 |
| 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 with a nominal amplitude between a black level and a white va... | 06/03/1986 |
| 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 level is determined by adjusting the bias lighting to a predet... | 02/11/1986 |
| 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 portrayal is traded off against sensitivity improvement, since p... | 08/20/1985 |
| 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 duration. The signal output generated during the N inhibi... | 03/05/1985 |
| 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 current or voltage varies between a maximum value and a minimum ... | 08/07/1984 |
| 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 control circuit comprises a controllable current source an out... | 04/03/1984 |
| 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 at the cathode electrode and through which there is a con... | 01/24/1984 |
| 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 picture signal amplifier in the control loop is provided with ... | 06/07/1983 |
| 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 circuit for the comparison of the video signal with a predeter... | 04/12/1983 |
| 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. The control signal is coupled through ACT pulsing circuit... | 04/05/1983 |
| 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 processing the picture signal generated by the pick-up tube,... | 12/21/1982 |
| 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 remaining field time interval. It follows that the speed of verti... | 05/25/1982 |
| 4322662 | Apparatus for controlling the electron beam in an image pick-up tube In an image pick-up tube of the type having a cathode electrode which emits a scanning electron beam, a control electrode which regulates the current of the electron beam at the cathode electrode and through which there is a control electrode current flow... | 03/30/1982 |
| 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 control grid and the cathode momentarily conducts more heavil... | 03/09/1982 |
| 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 camera tube. It also features a non-linear circuit which has a... | 12/15/1981 |
| 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, 14, 16) is fed back to the beam current control circuitry... | 03/31/1981 |
| 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 at a continuing field scanning of a target plate in the pic... | 11/11/1980 |
| 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 current and the available beam current of a diode-gun camera... | 10/21/1980 |
| 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 a periodical beam blanking bias is applied to the cathode ... | 06/03/1980 |
| 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 electrical pulse at onset of an unacceptably high local-illu... | 05/06/1980 |
| 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 coupled to the normal beam current supply circuit to automatical... | 02/26/1980 |
