Abstract: An automated acoustic micro imaging system includes a part-storage station favoring a dry environment, a part-transport robot, and a wet-environment inspection station. The wet-environment inspection station has an ultrasonic beam generator, a coupling fluid in which parts are inspected, and a part-retention stage. A moisture barrier is located between the wet-environment inspection station and the part-storage station favoring a dry environment. The inspection station includes a kinematic, quick-change part-retaining chuck and robotic means for interchanging chucks. Automatic acoustic micro imaging methods are disclosed.
November 17, 2000
Date of Patent:
October 8, 2002
Daniel M. Erickson, Daniel W. Micek, Michael G. Oravecz
Abstract: An improved tray-scanning station for a tray-fed scanning acoustic microscope prevents the dislodging of small, loosely held parts from the trays by coupling fluid as the trays pass through an inspection station, or by the action of a dryer as the trays pass through a drying station.
October 12, 2000
Date of Patent:
March 19, 2002
Daniel M. Erickson, Bryan P. Schackmuth
Abstract: A color cathode ray tube includes a faceplate having a predetermined pattern of phosphor deposits on a target surface thereof and a rear envelope section. A color selection electrode assembly includes a frame supporting in tension a foil having a pattern of apertures related to the predetermined pattern of phosphor deposits. Means are provided for bonding the color selection electrode assembly between the faceplate and the rear envelope section with the pattern of foil apertures in registration with said pattern of phosphor deposits such that the color selection electrode assembly is incorporated as an integral part of the cathode ray tube envelope. The foil is sized and the frame adapted such that the foil is supported completely within the tube enclosure on a peripheral frame surface facing away from the said faceplate.
Abstract: A color cathode ray tube comprises a faceplate having a predetermined pattern of phosphor deposits upon a target surface thereof. A color selection electrode assembly includes a frame which supports in tension a foil having an array of apertures related to the predetermined pattern of phosphor deposits on the faceplate. Means are disclosed for sealing the assembly between the faceplate and the rear envelope section of the tube to incorporate the color selection electrode assembly as an integral part of the cathode ray tube. Indexing means on the assembly and faceplate provide for repeated interregistered matings of the color selection electrode assembly with the faceplate. A method of utilizing the electrode assembly for screening the pattern of phosphor deposits on the faceplate is also disclosed.
Abstract: A tension mask color cathode ray tube comprises an envelope funnel having a central axis and including a bell portion, one extremity of which has a sealing land. A flat or cylindrical face panel has a target adapted to receive a pattern of luminescent primary color elemental phosphor areas, with a sealing land circumscribing the target. A color selection electrode structure sealed between the sealing lands of the funnel and panel constitutes an integral part of the tube envelope. The electrode structure has a central opening dimensioned to enclose the panel target, and includes a frame supporting a tensed foil color selection electrode. The frame has a support surface fixedly receiving and maintaining the electrode in tension. The frame further has an axial dimension which establishes the color selection electrode at a predetermined Q-distance from the target on the face panel.
Abstract: An improved metal detecting device of the beat frequency oscillator type is provided which incorporates a method for determining the side of the zero beat frequency at which a search oscillator is operating. The device includes a search coil conveniently mounted which is part of a search oscillator. A reference oscillator is also provided, the output of which is digitally compared to that of the search oscillator by a digital phase comparator. The digital phase comparator output is applied through a low pass filter to a slope detector circuit. The slope detector output signal is supplied to both an audio output circuit and a filter/comparator. The audio output is sufficient to facilitate location of permeable and conductive substances. The output of the slope detector also contains information which is extracted by the filter/comparator and translated to an audible signal by an oscillator and the audio output circuit.
Abstract: A sample and hold detector is described which preferably includes a differential amplifier, a current mirror and a storage capacitor which is charged and discharged to the voltage level of an electrical input signal during appropriate sampling intervals. The differential amplifier receives the electrical input signal as one input and the capacitor voltage as a second input for generating, at first and second differential amplifier output ports, currents which are a function of the voltage difference between its inputs. To charge and discharge the capacitor, the latter is coupled to the differential amplifier's second output port via a current path, and the current mirror is coupled between the output ports of the differential amplifier for sourcing to the second output port a predetermined percentage of differential amplifier current generated at the first output port.
Abstract: Disclosed is a microcomputer-controlled system and method for detecting a vertical synchronization pulse extracted from a composite synchronization signal provided to a television receiver. Sync pulse voltage level, period and duty cycle are analyzed in terms of predetermined vertical sync criteria in detecting valid vertical synchronization.
Abstract: A television receiver includes a frequency synthesizer phase lock loop operated in a time multiplexed manner to provide two tuning signals for tuning a received television signal. The two tuning signals are developed at the outputs of first and second voltage controlled local oscillators alternately operated in response to a phase detector which is reset at the beginning of each alternate operation.
Abstract: An integratable vertical sync separator is described for use in a television receiver. The preferred embodiment includes an integrated capacitor which is charged and alternately discharged by current sources in response to composite sync pulses such that the capacitor develops a relatively high level voltage when vertical sync pulses are received. The voltage developed by the capacitor is sensed by a peak detector for developing a vertical sync output pulse and for producing a feedback signal indicative of the amplitude of the relatively high level voltage on the capacitor. The feedback signal is applied to the current sources which are conditioned to vary the charge and discharge rates of the capacitor for improved performance in sub-standard signal conditions.
Abstract: An AFC circuit for a television system having stereophonic sound is disclosed. In response to a channel change, which causes a significant change in the level of the AFC error signal, the error signal is coupled substantially without modification to the local oscillator control terminal and the sound is muted. After an interval sufficient to permit frequency lock to be achieved the error signal is then coupled to the oscillator through a low pass filter and the muting operation is terminated.
Abstract: A color demodulation and matrixing system is disclosed for use in a color television receiver. The matrixing portion of the system receives R-Y and B-Y color-difference signals which may be developed by conventional demodulators. Each color-difference signal is converted to a pair of currents of opposing polarities which are coupled to a current node, and a load is coupled to the node for developing a G-Y voltage across the load. The demodulation portion of the system receives the R-Y and B-Y color-difference signals, converts each of them to currents of opposing polarities, and applies them to loads in push-pull fashion to develop R-Y and B-Y output voltages.
Abstract: A chroma amplifier and color killer are described for use in a color television receiver. In a preferred embodiment, the chroma amplifier comprises a first pair of emitter-coupled transistors receiving a current source which has a D.C. operating component and an A.C. chroma signal component. A second pair of emitter-coupled transistors receives another current source which has only a D.C. operating component substantially equal to that received by the first pair of transistors. A variable ACC voltage and a substantially fixed bias voltage are applied to selected base terminals of the transistors such that one of the first pairs of transistors develops a gain controlled A.C. chroma signal output and one of the second pair of transistors develops an ACC-varied D.C. output signal free of chroma component. The latter signal drives a low power color killer for quenching color reproduction when the color component of the broadcast signal is missing or is of very low amplitude.
Abstract: 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 amplifier. The log amplifier tends to equalize the amplitude of the image enhancement signals for various video transitions at an optimum amplitude. The signals are then applied to a noise processor which attenuates image enhancement signals which do not correlate to first derivatives of the corresponding video signals. In the noise processor, a multiplier receives as one input the compressed image enhancement signals and receives as another input control signals based on first derivatives of the video signals. The noise-processed signals are then coupled to the cathode ray tube to modulate the beam scan speed. Additionally, beam current may be modulated inversely with respect to the beam scan speed modulation.
Abstract: 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 includes terminal means for connecting the coil to a source of degaussing current for abating residual stray magnetic fields within the tube. Annular enclosure means surrounds the flange and defines an enclosure containing the coil. A body of hardened binder is formed in the enclosure. The body is reinforced by the coil of wire and serves to provide implosion protection for the tube.
Abstract: 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 that window are utilized to initiate vertical scan. When the received sync pulses are in time-coincidence with an internal control signal generated at a standard line/frame rate, the system switches to a narrow window mode of operation. Vertical sync pulses received during a narrow sync window continue to initiate vertical scan. When a lack of time-coincidence between received vertical sync pulses and the control signal occurs for a predetermined interval, the system reverts to its wide window mode.
Abstract: 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. The arc-suppression means is electrically resistive and is connected in an electrical path between the gun and a high voltage source, and its surface is physically exposed to a deposit of getter material when the getter is flashed. The arc-suppression means includes shadowing means for shadowing at least portions of the exposed surface from a deposit of the getter material to prevent the creation of an electrically conductive shorting path capable of permitting an arc to bypass or substantially nullify the arc-suppression means.
Abstract: 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 hard condition with a thickness of about 6-8 mils. The sheet is characterized by being composed of an interstitial free steel material. A stack of the blanks is subjected to a limited annealing operation, by being carried out at a relatively low maximum temperature and for a relatively brief period sufficient only to achieve recrystallization of the material without causing significant grain growth. The maximum temperature is below the temperature at which the blanks mutually adhere, and thus avoiding any handling-related folding or creasing of the blanks normally associated with attempts to separate blanks stuck together in conventional high temperature annealing operations.
Abstract: 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 surface of the medium surface waves of predetermined center wavelength. The output transducer receives the surface waves from the input transducer and develops output signals. The device is improved by one of the input and output transducers having at a transducer boundary or at an internal irregularity in the transducer tooth pattern a first tooth on a first comb connected to its associated bus bar. On an opposed second comb, there is provided a second tooth collinear with the first tooth but electrically isolated from its associated bus bar.
September 5, 1978
Date of Patent:
May 27, 1980
Zenith Radio Corporation
Forbes D. Gilchrist, Robert L. Miller, Richard W. Myers
Abstract: 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 unstressed inside diameter is slightly less than the outside diameter of the rod. The inside diameter of the spring is enlarged by imposing a torsional stress thereon. An end of the resistor rod is inserted into the opened spring and the spring is released to permit it to tightly constrict upon the rod and thereby make a sound electrical and mechanical engagement therewith. The spring is locked on the resistor rod by permanently joining together a number of the turns of said spring.