Abstract: A power supply includes a switch configured to control flow of current output from an inductor to an output of the power supply. The switch receives a switching signal from a control circuit. An auxiliary bias is generated to power the control circuit. A bias circuit outputs a bias signal that is used to generate the auxiliary bias. The bias circuit senses a level of the auxiliary bias to control output of the bias signal. Output of the bias signal may be controlled to maintain the level of the auxiliary bias at a target level or within a target range.

Abstract: An autotransformer steps up the output of a high voltage amplifier for applying a drive signal to the focus electrode of a CRT. A parabolic signal is obtained or generated at a deflection frequency such as the horizontal scanning frequency and is applied as an input to the amplifier. The amplifier output is coupled to a center tap of the autotransformer. One winding is serially coupled to the focus electrode and the other winding is AC coupled by a capacitor to ground, in parallel with the amplifier output. The transformer steps up the amplifier output voltage and can reduce the voltage rating required of transistors in the amplifier.

Abstract: A horizontal drive circuit employed in CRT displays which uses a switch-mode power supply operating in a boost topology to generate the appropriate supply voltage needed by the horizontal drive circuit is provided. The boost power supply is integrated into the horizontal drive circuit which allows for low printed circuit board area, low cost, and good performance over many different horizontal frequencies.

Abstract: An electromagnetic quadrupole circuit capable of always performing the optimal correction of the spot form is provided with: a current detecting means 20 for detecting the peak value and bottom value of current flowing along an electromagnetic quadrupole coil 8; a control means 50 for supplying a prescribed peak control value and a prescribed bottom control value; a first power source 16 for controlling the feedback of the amount of supply current based on the peak value detected by the current detecting means 20 and the peak control value supplied from the control means 50; and a second power source 17 for controlling the feedback of the amount of supply current based on the bottom value detected by the current detecting means 20 and the bottom control value supplied from the control means 50.

Abstract: A method of mounting a signal outputting electrode for outputting an electric signal generated in an envelope of a cathode ray tube to the outside without being adversely influenced by a getter. A signal outputting electrode is mounted in an area which is not covered with an internal conductive film in a state where the periphery of the electrode is apart from an inner wall of a funnel via an intermediate member. When a getter is introduced into the tube in the state where the signal outputting electrode is mounted, the getter is prevented from reaching the intermediate member. It therefore prevents conduction between the signal outputting electrode and the inner conductive film.

Abstract: A series circuit of first and second damper diodes (4a, 4b) and a series circuit of first and second resonance capacitors (5a, 5b) are connected in parallel between a collector and an emitter of a horizontal transistor (3). A series circuit of a horizontal deflecting winding (6), a capacitor (7) for an S-character correction, a capacitor (8) for blocking a direct current and a winding (9) for pin distortion modulation is connected in parallel between the collector and the emitter of the transistor (3). Further, connecting intermediate points of the damper diodes (4a, 4b), the resonance capacitors (5a, 5b) and the capacitors (7, 8) are connected to one another. A series circuit of a second capacitor (13) for the S-character correction and a switching device (14) formed of e.g., a MOS-FET element is connected in parallel to the capacitor (7) for the S-character correction.

Abstract: A thin cathode ray tube. A low voltage is applied to a beam of electrons produced by an electron gun. The electron beam is electromagnetically deflected through a large angle. Four static deflectors are used to deflect and accelerate the beam of electrons, and to let the beam of electrons have a sufficient energy level when it reaches a fluorescent screen. The cathode ray tube can effectively increase the deflection angle of the beam of electrons and reduce an incident angle of the beam of electrons so as to reproduce an image with less distortion.

Abstract: A cathode ray tube includes an electrostatic deflection system along the path of an electron beam e.sub.f and between an electron source and a display screen. The deflection system includes at least an electrostatic photodeflector including a photodetector which, in response to an incident light radiation, creates electric charges e.sub.p which modify the electric deflection field of the photodeflector. The photodeflector may be made up of three electrodes or two electrodes so that the electron beam e.sub.f and the electric charges e.sub.p generated are or are not situated in the same space. The photodetector may be a photocathode or a photodiode. The structure may be repetitive in order to form a distributed photodeflector along the path of the electron beam e.sub.f. The cathode ray tube may be used as part of an oscilloscope.

Abstract: An electron tube, such as a streak tube, is equipped with a gate element for gating unnecessary photoelectrons to prevent them from appearing as a pseudo output signal. A deflection voltage of main deflection plates (typically travelling-wave type) is delayed by a predetermined time and provided to the gate element. The gate element may be shifting deflection plates for sweeping the photoelectrons in a direction perpendicular to the main sweeping direction, a microchannel plate for multiplying the photoelectrons, or a photocathode.

Abstract: A parallel sweeping system for electrostatic sweeping ion implanters comprising an ion source for generating an ion beam, first and second multipole beam deflectors along and around a common optical axis and a target wafer to be raster-scanned by the deflected beam. The two deflectors have the same number of electrodes of five or more and have similar configurations. One electrode of the first deflector is paired with an electrode of the second deflector in the same plane common with the optical axis, but on the opposite side of the optical axis. The same sweeping voltage is applied simultaneously to each electrode of a pair in the same plane and predetermined different voltages to each pair of electrodes. Thus, a substrate is constantly raster-scanned by means of parallel ion beams with predetermined direction, namely raster-scanned with the ion beam all over a large wafer with exact parallelism to the optical axis.

Abstract: A deflecting voltage generating circuit comprising a voltage generating unit for generating a deflecting voltage and a voltage correcting unit for correcting the deflecting voltage generated by the voltage generating unit and applying the deflecting voltage thus corrected to deflecting electrodes of a streak tube, a sampling streak tube or the like. The voltage correcting unit is so designed that for a predetermined period from the time instant when the deflecting voltage changes, the deflecting voltage is not applied to the deflecting electrodes, and immediately after the lapse of the predetermined period the deflecting voltage is applied to the deflecting electrodes.

Abstract: In a deflection apparatus which corrects for inside pincushion distortion, a deflection winding and a retrace capacitance form a retrace circuit during a retrace interval. A trace capacitance forms a trace resonant circuit with the deflection winding during the trace interval. A circuit branch that includes a second capacitance and a modulation inductance is coupled to the trace capacitance during the trace interval to form with the trace capacitance a second resonant circuit having a resonance frequency that is substantially higher during the trace interval than that of the trace resonant circuit. A current in the circuit branch modulates the trace parabolic voltage across the trace capacitance in a manner to reduce inside pincushion distortion. A supply current is coupled to an intermediate terminal of the modulation inductance for reducing "mouseteeth" raster distortions.

Abstract: A magnetic focusing and electrostatic deflecting image pickup tube comprises electrostatic deflection electrodes each constituted by a straight arrow pattern yoke composed of straight line segments arrayed in a linear zigzag pattern. The pattern yoke has a twist angle set at a value not greater than 105.degree.. An average value of angles formed by each upper apex and two lower apices adjacent to the upper apex of the zigzag pattern yoke with reference to the axis of the tube lies within a range of 116.degree. to 127.degree..

Abstract: An imaging system for focusing and deflecting an electron beam comprises, as in prior systems, an evacuated envelope structure having a longitudinal axis and a solenoid for generating a substantially uniform magnetic field within the envelope and along the longitudinal axis thereof. As in prior systems of this type, the envelope includes an electrostatic yoke therein for generating a variable substantially uniform electric field within the envelope to deflect the electron beam along two coordinates of the system. The electric field is orthogonal to the magnetic field. An electron gun within the envelope generates and directs the electron beam through the magnetic and electric field to a target located opposite the electron gun and in a plane perpendicular to the axis of the tube. Unlike prior systems, the electrostatic yoke of the present system comprises a first conductive layer bonded to the interior surface of the envelope, and a second conductive layer overlying the first conductive layer.

Abstract: A sweep generator for the delivery of a sweep signal to a deflection system (typically horizontal) of a cathode ray tube, including a sawtooth generator for generating a sawtooth waveform containing a ramp which determines the duration of each sweep. A frequency divider such as a D flip flop is connected to a trigger circuit for generating, when enabled by a holdoff signal, output pulses whose recurrence rate is a submultiple of that of the incoming trigger pulses. Also when enabled by the holdoff signal, a sweep gating flip flop responds to the first output pulse from the frequency divider for causing the sawtooth generator to generate the sweep ramp. Thus, since the sweep gating flip flop does not directly responds to the trigger pulses, but to the output pulses of the frequency divider, no jitter is to take place if the holdoff signal acquires a prescribed state for sweep initiation concurrently with a trigger pulse.

Abstract: A line scanning circuit for an electrostatically deflected cathode ray tube uses two integrator circuits having single transistor amplifiers for complementary conductivity types with capacitive feedback to provide balanced sawtooth drive waveforms. The charges on the capacitors are reset by pulses at line frequency and the forward sweeps of the sawteeth are produced by current flowing from the input of one integrator to the input of the other integrator. A variable resistor in the current path provides width control and a transistor connected in series with the current path enables dynamic adjustment of the scan to be provided to suit the scanning characteristics of a flat cathode ray tube. A signal from the field scanning circuit during flyback is applied to turn off the transistor in the current path so that the spot is returned during field flyback up one side of the screen.

Abstract: A power supply and scanning line deflection circuit for a picture display device. The power supply circuit comprises an inductance and a switch which switches at line frequency, the inductance forming part of a resonant network during the cut-off period of the switch. The line deflection circuit comprises another switch which also switches at line frequency and a line deflection coil which during the cut-off period of the switch, which substantially coincides with the retrace period, forms part of a resonant network which also comprises an inductance. A transformer winding is coupled to one of the inductances. During the cut-off period of the switch pulses are developed across this transformer winding which are rectified for generating a supply voltage for a variable load.

Abstract: A triangular waveform generator for applying a scanning waveform to the scan electrodes of a modular display device includes a constant current source and a coupling transformer. A charge storage capacitor is coupled to the secondary of the coupling transformer. A squarewave generator actuates a switch to alternately charge the capacitor in opposite directions resulting in the generation of the triangular waveform. Discharge means is provided to protect the switch from high voltages which could be developed when the generator is turned off.

Abstract: A cursive writing type cathode ray tube (CRT) display system in which the vertical size of the characters are increased by an input command from a keyboard and central processing unit (CPU). The CRT has both electrostatic and magnetic deflection systems with the magnetic deflection producing a raster in which each horizontal scan is electrostatically deflected to write characters on the screen. The characters are formed from stored digital codes selected by commands from the CPU. Digital to analog (D/A) converters produce analog deflection signals to produce a set of multiple strokes to form a character and to produce analog voltages for controlling the brightness of the stroke. Digital commands from the CPU are generated to increase or decrease the magnitudes of the various analog signals from the D/A converters when changing the vertical character size.

Abstract: A vertical sawtooth generator adaptable for integrated circuit application self-oscillates under control of a latch circuit. A circuit controls the linearity of the charging capacitor ramp voltage. High frequency components of the recurrent ramp occurring due to the retrace discharge current are reduced by controlling the discharge currents. The ramp rate is controlled by a single resistor external to an integrated circuit.

Abstract: A line deflection circuit in a television display apparatus. Between the parallel diode and the chassis there is a series arrangement of a first winding and a capacitor, a second winding being included between the switch and the voltage supply source. A diode is connected to a point of the first and to a point of the second winding and conducts in the retrace period of the deflection current. By adjusting the conduction time of the switch a trace voltage can be obtained which exceeds the supply voltage so that the circuit is suitable for battery supply.

Abstract: A negative-feedback arrangement for a switched-mode vertical deflection circuit automatically controls the duration of that overlap portion of the vertical trace interval in which simultaneous conduction of the vertical deflection control switches occurs.

Abstract: A vertical-sweep generator for a deflection yoke of a cathode-ray tube in a television receiver comprises a monolithic integrated semiconductor chip including transistors and resistors defining, together with external circuit elements, a free-running multivibrator (O, O.sub.1), an associated synchronizing circuit (O.sub.2), and a ramp-current generator (RC, RC.sub.1) controlled by the multivibrator in order to regulate the yoke current by way of a power amplifier (PA) and a flyback circuit (FG).

Abstract: A thyristor gate drive circuit includes a unidirectional current conducting device coupled to charge a capacitor with single polarity signals. The discharge of the capacitor is controlled so that polarity changes in the drive waveform do not effect the polarity of the drive signal coupled to the gate.

Abstract: First pulses timed for enabling conduction of a first switch in a two-switch deflection system are delayed and combined with retrace pulses obtained from the system for forming second pulses suitably timed for enabling conduction of the second switch.

Abstract: A supply voltage arrangement in a television receiver, which arrangement is switched at line frequency. The diode of the arrangement is shunted by the series combination of a capacitor and a primary winding of a transformer, a secondary of which controls the switch in the line deflection circuit.

Abstract: An amplifier circuit for amplifying a repetitive alternating signal, the amplifier circuit having a voltage feedback loop which includes a sampling circuit. The sampling circuit is arranged to sample the output voltage of the amplifier at a given time during each cycle of the alternating signal and to store the sampled voltage for the remainder of the cycle. This stored voltage is used as a feedback signal for the amplifier. Since the output is sampled at the same time during each cycle of the alternating signal the filter circuit in the feedback loop may be omitted and the phase shift introduced by the feedback loop may be arranged to be constant with varying frequencies. When used in a field deflection circuit for television display apparatus the deflection waveform is preferably sampled during the flyback period.

Abstract: A circuit is a combination of a switched mode power supply and a TV deflection circuit. It features a pair of switches and a pair of inductors that are tuned to selected frequencies so that when the switches are off, the inductor voltages have a half sine wave shape.

Abstract: Interference oscillations in the frequency ranges around 0.2 MHz and 1 MHz are eliminated in a deflection coil by the provision of an additional circuit element. The additional circuit element can be formed by an additional electrically conductive foil which is connected to the current supply side of the line coil sections or by a capacitor which connects this supply line to the central contacts of the series-connected frame coil sections. The connection of the coil sections with respect to each other should usually be adapted to the winding sense of the coil sections so as to ensure proper elimination of the interference oscillations.

Abstract: A high voltage regulating circuit has a cathode-ray tube, horizontal deflection means comprising a horizontal deflection output transistor and a horizontal deflection coil for generating a saw-tooth current therein, high voltage generating means connected with the anode of the cathode-ray tube for supplying a high D.C. voltage to the anode thereof and comprising a high voltage generating output transistor, a flyback transformer and a high voltage rectifier, a voltage source, a variable impedance means connected between the voltage source and the high voltage generating means, and a control signal supply means. The control signal is supplied to the impedance means to control the impedance thereof so as to control the voltage supplied to the high voltage generating means thereby maintaining constant the high D.C. voltage supplied to the anode of the cathode-ray tube.

Abstract: An improved sweep generator circuit suitable for deflection circuits in television receivers conventionally includes a condenser chargeable through a resistance to establish the sweep. A resistive voltage divider and a threshold comparator circuit are each arranged parallel to the condenser. The comparator circuit is triggerable to establish a low impedance discharge path across the condenser when the charging voltage across the condenser exceeds a normal reference voltage from the voltage divider. The frequency of the generator is made variable in response to a synchronization frequency within predetermined limits by shunting a resistance of the voltage divider by a control resistance through an electronic switch that is triggerable by the sync pulse train.

Abstract: A deflection circuit has a sawtooth generator with a control input and an output stage, each having a different power supply. A control voltage derived from the output stage supply is applied to the control input to decrease the flyback period as the output stage supply voltage increases.

Abstract: The current flowing through the horizontal deflection coil of a cathod ray tube is controlled by a transistor which is switched between saturation and cut off by a circuit having a pulse generator for generating a pulse in response to a horizontal synchronizing pulse. The leading edge of the generated pulse is delayed before being applied to the controlling transistor which switches sometime thereafter due to the storage time of the transistor. To insure that the blanking of the electron beam of the tube takes place during the retrace time, the blanking interval is set to occur a period of time after the horizontal synchronizing signal which is less than the sum of the storage time of the transistor and the time which the leading edge of the generated pulse is delayed.

Abstract: A circuit arrangement which is the combination of a switched supply circuit and a line deflection circuit, the supply transformer being replaced by a coil.