| Patent Number |
Title Of Patent |
Date Issued |
| 4287535 |
High voltage shutdown circuit with current feedback for cathode ray tube |
September 1, 1981 |
| An X-radiation protection circuit in a television receiver which permits safe operation at higher voltages and beam currents with corresponding increased video presentation brightness without the production of hazardous X-radiation by means of a control loop in which current in the h |
| 4285005 |
Color correction circuit for a color television receiver |
August 18, 1981 |
| A color correction circuit is described for use in a color television receiver of the type which includes a B-Y demodulator and a network for sensing color-difference signals which are representative of hues within a selected range of fleshtones. In the preferred embodiment, the color |
| 4280931 |
Method and composition for electrically resistive material for television cathode ray tubes |
July 28, 1981 |
| An improved electrically resistive arc-suppressive material is disclosed for use in a television cathode ray tube. The tube includes a funnel with a conductive coating on the inner surface thereof and a neck enclosing an electron gun having snubber springs extending from an anode electro |
| 4280140 |
Microcomputer-controlled one-step-back automatic frequency control tuning system |
July 21, 1981 |
| An electronic, microcomputer-controlled television tuning system capable of acquiring channels offset by as much as 3.25 MHz from the designated frequency while also being able to accurately tune in channels operating at the designated frequency. After synthesizing the correct channel |
| 4279035 |
Channel number entry system |
July 14, 1981 |
| A keyboard-operated, microcomputer-controlled method and apparatus for selecting a channel in a television receiver. Following selection of the desired channel, appropriate tuning data is stored in memory with the channel number display updated to present the selected channel until a |
| 4275338 |
Anti-spot burn protection for CRT |
June 23, 1981 |
| A video amplifier circuit for a cathode ray tube in a video display includes an anti-spot burn protection system for preventing damage to the fluorescent screen when deflection voltages are removed as in tube turn-off. A diode network in the video amplifier circuit controls the rate |
| 4274110 |
Projection television system |
June 16, 1981 |
| Means and method are disclosed for compensating for non-linear magnification distortion in projection television systems. The projection television system has a projection screen for displaying a light image cast thereon. The screen is spaced apart from at least one light projection |
| 4272705 |
Anti-ringing circuit for CRT deflection yoke |
June 9, 1981 |
| A cathode ray tube (CRT) in a video display utilizes an anti-ringing system for minimizing beam scanning distortion at the start of trace. This distortion is due to velocity modulation of the scanning beam caused by high frequency, resonant energy in the inductances of the linearity and |
| 4271529 |
Tunable resonant circuits for a multi-band VHF/UHF/CATV tuner |
June 2, 1981 |
| A conventional varactor tuned VHF/UHF television tuner with additional inductors placed in parallel in each VHF tuned circuit by means of diode switching provides an additional tuning capability over the CATV Superband. Selective tuning to any broadcast channel within the VHF, UHF an |
| 4270218 |
Continuous tune all-channel selector |
May 26, 1981 |
| Disclosed is a UHF-VHF combination channel selector for use with varactor diode tuners in which varactor control voltage is provided by a plurality of tapered potentiometers covering the various tuning segments. Non-detent, continuous channel selection is provided by rotation of a si |
| 4263616 |
Signal peaking method and apparatus |
April 21, 1981 |
| A method and apparatus is disclosed for peaking the amplitude transitions of an information-bearing signal such as a video signal. From the video signal, a control signal and a peaking signal are developed, each having magnitude variations related to and occurring in time correlation wit |
| 4263615 |
Horizontal drive circuit for video display |
April 21, 1981 |
| Disclosed is a horizontal drive system and method for operating a video display capable of precisely controlling over a wide timing range the interval between the arrival of the leading edge of the input drive pulse and the initiation of the flyback pulse thus permitting the horizontal |
| 4263539 |
Automatic antenna positioning apparatus |
April 21, 1981 |
| Apparatus for rotating an antenna to a predetermined position and maintaining said position is disclosed. The system comprises an antenna position sensing signal source, a desired position signal source, both of which provide analog signals, position comparator means, and antenna drive |
| 4262315 |
Tape cassette turn-over mechanism |
April 14, 1981 |
| A turn-over mechanism for rectangular cassettes used in video and audio tape recording/reproducing in the first and a second direction is disclosed. The mechanism provides for turning over the cassette as it is raised and lowered from the operating deck of the recorder/reproducer. The |
| 4261014 |
Spot arrest system |
April 7, 1981 |
| A spot arrest system modulates cathode ray tube beam scanning speed in accordance with compressed and noise-processed image enhancement signals derived from video signal transitions. A generator provides first derivative type image enhancement signals which are compressed by a log am |
| 4253119 |
Interface system for surface wave integratable filter |
February 24, 1981 |
| A system is described for interfacing a SWIF with a tuner and an amplifier in the IF section of a television receiver. In the preferred arrangement, the tuner is coupled to the input of the SWIF so as to efficiently transfer signal power to the SWIF over the frequency range of the tuner' |
| 4253118 |
Synchronous detection system |
February 24, 1981 |
| A system is described for synchronously detecting a video signal along a selectable detection axis. The system includes a limiter receiving an input video signal and a phase-locked loop for developing an oscillator signal whose frequency is locked to the frequency of the video signal. A |
| 4253117 |
Multivibrator synchronization system for video display |
February 24, 1981 |
| A system for increasing synchronization signal injection to a free-running multivibrator in the horizontal drive circuit of a video display which enhances synchronization signal frequency capture range is disclosed. A reduction in synchronization input signal amplitude due to an input si |
| 4253109 |
D.C. Tint control |
February 24, 1981 |
| A D.C. tint control is described for use in a color television receiver. The tint control receives a pair of 3.8 megahertz currents which are preferably in phase quadrature with each other, and a D.C. control voltage whose value is variable by a viewer to change the tint of reproduced co |
| 4253108 |
Control for color killer and automatic color limiter |
February 24, 1981 |
| A control network and method for a color television receiver is described for enabling and disabling the limiting action of a conventional ACL (Automatic Color Limiter) circuit, for varying the threshold at which a color killer circuit inhibits reproduction of color images, or for ef |
| 4253041 |
Extended field electron gun having a synthesized axial potential |
February 24, 1981 |
| An electron gun for a television cathode ray tube is disclosed having cathode means and grid means for producing a beam of electrons. A low-aberration, low-magnification main focus lens means comprising at least three electrodes receives a predetermined pattern of applied voltages to |
| 4250602 |
Method for mating television CRT cathode components |
February 17, 1981 |
| A method is disclosed for mating the tubular cap and tubular shank of the cathode assembly used in TV CRT electron guns. The shank has an end larger in diameter than the cap, and a narrow end adapted to fit into the cap. The method comprises causing the cap to fall open-end-down into a f |
| 4250457 |
Full wave rectifier envelope detector |
February 10, 1981 |
| A detector is described for fully rectifying a low level A.C. input signal without developing switching transients or substantial levels of undesirable signal components. The output of the detector is substantially equal to the square root of the sum of the square of the input signal and |
| 4249582 |
Method and apparatus for forming electrical leads for retention in printed circuit boards |
February 10, 1981 |
| A method is disclosed for the temporary retention of insulated electrical leads by a printed circuit board preparatory to permanent electrical and mechanical attachment. Also disclosed is apparatus for forming the leads for said retention. The lead has a metallic wire therethrough with a |
| 4245350 |
Automatic gain control system for direct-access television receiver |
January 13, 1981 |
| A control system is described for use in a television receiver adapted to receive multi-band television signals and which has a direct-access type tuning system. In such a tuning system, the receiver employs at least one local oscillator, the output of which is applied to a prescaler for |
| 4241449 |
Memory saving all-channel digital television receiver |
December 23, 1980 |
| An all-channel television receiver includes a memory address counter for scanning a limited location memory for channel numbers and additional receiver adjustment information in response to a channel number input. Further television function control memories and counters for adjustment |
| 4237478 |
I.C. chroma injection and demodulation system |
December 2, 1980 |
| An integrated injection and demodulation system is described for developing three color-difference signals in a color television receiver. To employ three separate demodulators, one for each color-difference signal, on a single integrated circuit chip without increasing the number of ext |
| 4236184 |
Multi-function structure for a color cathode ray tube |
November 25, 1980 |
| A multi-function system for use in a color television picture tube having a glass bulb includes a funnel and a faceplate with a rearward flange which mates with and is sealed to the funnel. A pre-formed coil of electrically conductive wire engirds the flange of the faceplate. The coil in |
| 4234828 |
Self-oscillating sawtooth current deflection generator |
November 18, 1980 |
| Disclosed is an SCR-analogue, dual coupled transistor vertical oscillator for synching the vertical sweep in a video display with vertical synchronization input signals. Capable of stable, free-running oscillation at two, variable DC levels, the coupled transistor configuration in co |
| 4233630 |
Circuit for modifying the IF response of a television receiver |
November 11, 1980 |
| A "walking circuit" for modifying the IF frequency response of a television receiver is disclosed. The walking circuit includes an amplifier having a pair of selectable gain-degeneration impedances, one such impedance providing the amplifier with a wide band frequency response and the ot |
| 4233628 |
NTSC receiver useable with Teletext/Viewdata information |
November 11, 1980 |
| A Teletext equipped NTSC television receiver system includes means for compressing the raster in the vertical direction in response to 625-line formatted Teletext signals to display normally overscanned horizontal lines on the television viewing screen. Thus 625-line formatted Teletext |
| 4228461 |
Vertical synchronization system |
October 14, 1980 |
| A two-mode digital vertical synchronization system is described for controlling the phase synchronization of vertical scan in a television receiver. In one mode, the system searches for incoming vertical sync pulses which occur during a wide sync "window". Sync pulses received during |
| 4227114 |
Cathodoluminescent gas discharge image display panel |
October 7, 1980 |
| This disclosure depicts a high-voltage cathodoluminescent gas discharge image display panel having an ordered array of display elements. The panel includes envelope means containing an ionizable gas at a predetermined very low pressure. The envelope means includes a transparent faceplate |
| 4220932 |
Buffer amplifier |
September 2, 1980 |
| A buffer amplifier is described for use in an integrated circuit in which a siganl from a processing circuit is coupled by the buffer amplifier to an output pin on the integrated circuit. The buffer amplifier includes a pair of transistors, the first of which receives the output of the p |
| 4220893 |
Electrically resistive arc suppressor shadowing getter flash |
September 2, 1980 |
| This disclosure depicts an arc-suppression means for use in cathode ray tubes having an electron gun and ancillary electrical circuits susceptible to damaging electrical arcing currents, and wherein getter means are used to capture residual gases in the evacuated envelope of the tube. Th |
| 4219840 |
Color corrector |
August 26, 1980 |
| An automatic color corrector is disclosed for use in a color television receiver. To enable color correction of chroma signals within a selected range of the fleshtone axis, the outputs of the chroma demodulators are sensed to develop a control signal. In response to the control signal, |
| 4217521 |
High potential static discharge means for television cathode ray tubes |
August 12, 1980 |
| This disclosure depicts a television picture tube subject to an undesired build-up of localized high-potential static charges and high-potential charge retention. The tube is characterized by a resistive coating deposited on at least one of the normally uncoated outer areas of the tube |
| 4217520 |
Image display faceplate having a chromatic matrix |
August 12, 1980 |
| This disclosure depicts an image display having a viewing faceplate for exhibiting an informational color image. The faceplate has deposited on an inner surface thereof a light-absorbing matrix surrounding mutually spaced elemental areas. The faceplate and each area includes a plurality |
| 4212902 |
Method for aluminizing image display faceplates |
July 15, 1980 |
| This invention relates to improvements in the art of aluminizing the phosphor screens of image display devices such as television cathode ray picture tubes. An improved method comprises the application of a highly alkaline aqueous dispersion of a siliceous coating agent and a surfactant |
| 4210843 |
Color CRT shadow mask and method of making same |
July 1, 1980 |
| This disclosure depicts an improved method of making a color CRT shadow mask. The improved method comprises providing a plurality of shadow mask blanks each with a pattern of apertures photoetched therein, which blanks have been cut from a foil of steel, precision cold-rolled to a full h |
| 4208610 |
Television picture tubes having an electron gun with aperture electrode shielding means |
June 17, 1980 |
| This disclosure depicts a television cathode ray picture tube having a plural-beam electron gun for projecting in superimposition on the picture imaging screen of the tube at least two electron beam spots. The gun includes at least one aperture electrode having an aperture for passage |
| 4207588 |
Color killer |
June 10, 1980 |
| A hysteresis type color killer is described for use in a color television receiver. Lower power dissipation in the color killer is achieved by adapting an existing transistor stage in the chroma channel as a source of d.c. feedback for the color killer. Hence, the transistor stage does |
| 4205280 |
Surface wave device with suppressed boundary-reflected waves |
May 27, 1980 |
| This disclosure depicts a surface wave transmitting device having a piezoelectric surface wave propagative medium and interdigitated comb-type input and output transducers on a surface of said medium. The input transducer is responsive to a source of input signals for launching on the |
| 4204302 |
Method for terminating an electrical resistor for a television CRT |
May 27, 1980 |
| This disclosure depicts an improved method for terminating an electrical resistor for a televisin CRT which could be used for arc suppression, voltage division or the like. The method comprises providing a cylindrical resistor rod and an electrically conductive coil spring whose unstress |
| 4199706 |
Spring-loaded resistor terminal |
April 22, 1980 |
| This disclosure depicts structure and method for terminating an electrical resistor for a television CRT which could be used for arc suppression, voltage division or the like. The structure is disclosed in a preferred form as comprising a cylindrical rod of predetermined length, diameter |
| 4196446 |
Television picture tube having enhanced resolution and color purity |
April 1, 1980 |
| A color television receiver system has a cathode ray picture tube including an imaging faceplate having deposits of multi-color phosphor targets thereon. The tube includes a three-beam electron gun and a color selection aperture mask having apertures in registration with the targets. A |
| 4196015 |
Rewetting solution and method for aluminizing image display faceplates |
April 1, 1980 |
| This invention relates to improvements in the art of aluminizing the phosphor screens of image display devices such as television cathode ray picture tubes. A solution for rewetting a phosphor-bearing image display faceplate prior to aluminizing comprises a highly alkaline aqueous di |
| 4195315 |
Lockable adjustment means for self-converging adjustable yoke assembly |
March 25, 1980 |
| A self-converging adjustable yoke assembly comprises a lightweight plastic liner, sandwiched between saddle type horizontal coils and toroidal type vertical coils, with an attached rear for clamping the assembly on the neck of a picture tube. The periphery of the liner has three symmetri |
| 4193120 |
Addressable event display and control system |
March 11, 1980 |
| An addressable event display and control system for use with a clock controlled programmable memory employs an array of LED's as event designators each of which signifies, when energized, a programmed event in the memory. A bank of seven dual LED's, which is coupled to the memory, is |
| 4193090 |
Optical detection system for simultaneously interrogating a plurality of tracks |
March 11, 1980 |
| The present invention relates in general to an optical video detection system for retrieving recorded information. More particularly, the invention relates to an optical detection system whereby optical means focus a laser beam into a reading spot of an area sufficient to interrogate |
