Abstract: An improved delayed sweep system is disclosed for an oscilloscope having main and delayed sweeps. A trigger pickoff circuit has means for providing a pair of pre-selected trigger pickoff points on the delaying sweep so that delayed sweeps may be generated in accordance with the two points selected. An alternating display mode facilitates presentation of the delaying sweep and both delayed sweeps in a single display, with the relative time positions of both delayed sweeps appearing on the delaying sweep as a pair of intensified zones. Either delay time measurement between the sweep start and a point of interest on the display, or differential time measurement between two points of interest on the display may be made. Voltages proportional to the selected time measurement may be applied to a properly scaled digital voltmeter to provide a direct readout in units of time.

Abstract: An oscilloscope has an additional vertical display mode to enable the display of the trigger signal, activating the sweep generating circuit, simultaneously with the display of the normal vertical channels. The triggering source, level, slope and subtle time relationships can be verified and examined continuously and concurrently with the measurements upon the normal vertical channels. The displayed trigger signal is in correct time relationship with the normal vertical channels and the trigger level threshold is identified.

Abstract: A character selector for a shaped beam cathode ray tube comprising an orthogonal pair of air core deflection coils each of which consists of two identical halves formed to fit snugly over the neck of the cathode ray tube. The coils are continuous windings of electrically conductive material and comprise three sections which in operation cause an on-axis electron beam to be sequentially deflected off-axis, converged back to the axis and then referenced along the axis so that the final path of the beam, sequentially deflected on off-axis excursion paths through various shaping apertures in a stencil, is dependent of its off-axis excursion. The character selector may include magnetic material placed over at least a portion of the windings to provide a fine adjustment of the relative magnetic field strength as well as for enhancing the magnetic efficiency and shielding of the device.

Abstract: 1. A rugged combustion-heated electron tube comprising: a metallic conica-shaped anode structure; a metallic conically-shaped cathode structure insulatedly and coaxially mounted in spaced relationship to said anode structure; a metallic conically-shaped grid structure insulatedly and coaxially mounted in spaced relationship between said anode structure and said cathode structure; first and second annular insulating spacer-seals separating said anode structure from said grid structure and said grid structure from said cathode structure, said spacer-seals in combination with said anode structure and said cathode structure providing a hermetically-sealed envelope containing said grid structure; and a combustible material mounted exteriorly of said envelope in proximity to said cathode structure, said combustible material being adapted to heat said cathode structure to an operating temperature.

Abstract: A fluid film levitated horizontally oriented disc is self-centering and floating above another similar mating surface stationary disc. A means for varying the natural period of free oscillation of the levitated disc within the normal earthquake band of frequencies and a means for damping out such free oscillations along with a means for transducing positional differences between the discs into signals wherein earth tremors arriving from any horizontal direction may be recorded.

Abstract: Rodents are attracted to a pre-selected location by generating ultrasonic signals having pre-determined frequencies, time durations and repetition rates which correspond to instinctual vocalization of rodents. A recording is made of the sounds generated by young rodents which recording is digitized and stored in a memory unit. The stored recording is non-destructively read out of memory and converted back to an analogue signal which substantially corresponds to the sound wave form generated by the young rodent. This signal is amplified and converted to a sound signal in an appropriate transducer for attracting rodents to a pre-determined location.

Abstract: The viewing screen of a radar apparatus contains a pair of luminescent layers having green and red luminescing colors respectively. The color of the radar image may be altered by photosensitive means responsive to ambient light which alters the anode voltage of the electron beam gun so that the radar images are green during the day and orange during the night, thereby to avoid dazzling the viewer at night.

Abstract: A vertical deflection circuit comprises a first transistor, the base of which is impressed with a vertical synchronizing signal so that it is turned on during a vertical blanking period, while it is turned off during a vertical scan period, the collector of which is connected to a constant voltage supply and the emitter of which is connected to a capacitor so that the capacitor is charged to a predetermined voltage during the vertical blanking period. A second transistor has its collector connected to the junction point of the emitter of the first transistor and the capacitor, and the base thereof is connected to another constant voltage supply. Two resistors having a low resistance are inserted in series with a vertical deflection coil and the junction point of the resistors is coupled to the emitter of the second transistor through a feedback resistor. The charge stored in the capacitor during the vertical blanking period is discharged through the second transistor during the vertical scan period.

Abstract: A deflection circuit for a television receiver comprises a deflection winding coupled to commutating and trace switches. A reactive circuit including a capacitor is coupled between the switches. A transient voltage damping circuit is coupled across the commutating switch. The damping circuit includes a transformer comprising a primary winding to which the transient voltages are coupled and a secondary winding coupled to an auxiliary load circuit.

Abstract: A compensation circuit for use in a display system for displaying graphical images on an energy responsive surface with a radiant energy beam. The compensation circuit linearizes the relation between a control signal and the amount of deflection of the radiant energy beam upon the radiant energy responsive surface. A nonlinear circuit provides an extremely accurate compensation signal which is non-monotonically related to the magnitude of the control signal. When the control signal is combined with the compensation signal, a compensated deflection control signal is provided having a compensation signal component which generally diminishes for increasing deflections of the radiant energy beam. The amount of circuitry necessary to provide four quadrant compensation is diminished by providing a compensation signal based upon only one quadrant, and then switching the sign of the compensated deflection signal so produced to correspond to the desired deflection direction.

Abstract: An ultrasonic wave horn adaptable to any desired radiation pattern varying in length-to-breadth ratio of intended detecting area. The horn comprises at least a horn body having gradually expanding caliber from a constricted throat to an expanded opening which is of a flat shape with an unequal length-to-breadth ratio, and an ultrasonic wave generating source of which wave emitting side is disposed adjacent the constricted throat of the horn body, wherein the constricted throat of the horn body is also of a flat shape having an unequal length-to-breadth ratio and the respective major axes of the flat-shaped constricted throat and expanded opening of the horn body are in a relation of intersecting each other at right angles.

Abstract: A write electron gun is disposed at one end of a vacuum envelope to produce an electron beam modulated by an external input signal having signal elements occurring at a first given rate. A self-scanned array is disposed at the other end of the envelope. An electron beam deflection system is disposed in the envelope between the electron gun and the array to scan the electron beam over the array to store the signal elements in the array with the array providing electron gain for the stored signal elements. A source of read out signals is disposed externally of the envelope coupled to the array to read out the signal elements at a second given rate less than the first given rate.

Abstract: A voltage regulator provides a regulated B+ voltage to the horizontal deflection circuit of a television receiver. A positive feedback loop senses the load current drawn by the deflection circuit. The positive feedback voltage increases the magnitude of a reactive impedance component of the voltage regulator as the load current increases in order to maintain a substantially constant raster width.

Abstract: A horizontal deflection generator provides scanning current in a deflection winding and a pincushion modulating circuit is coupled to the deflection winding for modulating the horizontal scanning current. A vertical deflection generator and the horizontal deflection generator are coupled by means to the modulating circuit for providing vertical rate signals and nonlinear horizontal rate signals to the modulating circuit for providing a vertical rate distortion correction signal component modulated by the nonlinear horizontal rate signals for reducing the side pincushion distortion.

Abstract: A double deflection scanning system for electron beam instruments is provided embodying a means of correcting isotropic coma, and anisotropic coma aberrations induced by the magnetic lens of such an instrument. The scanning system deflects the beam prior to entry into the magnetic lens from the normal on-axis intersection of the beam with the lens according to predetermined formulas and thereby reduces the aberrations.

Abstract: Silicon diode array target sensitivity is made adjustable over a wide range by retracing the reading electron beam in the erase mode for each line, a variable number of scan periods ahead of its being read.

Abstract: An electric amplifying arrangement for supplying current to an inductive load in response to an input signal of saw-tooth waveform, e.g. a deflection amplifier for a cathode ray tube, wherein during the ramp portion of the input voltage a linear relation is maintained between variation in the load current and the input signal (i.e. Class A operation occurs) and, during flyback, energy recovery is provided, thereby providing higher efficiency than is obtained with known Class A saw-tooth amplifiers.

Abstract: System and method in which correction signals are computed and applied individually and automatically to eliminate aberrations produced by non-linearities in the deflection amplifiers, yoke and cathode ray tube of a television display. During a programming period, alignment signals are applied to the deflection circuits in place of the normal scan signal, and the position of the beam on the screen is monitored. When the beam is at predetermined points, the correction signals are computed, and these signals are stored. During normal operation of the television system, the correction signals are addressed in accordance with the beam scan signals, and the correction signals are combined with the scan signals to maintain the beam on the desired path.

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 color cathode ray tube preferably of the single gun, plural beam type wherein the beams originate on a horizontal or vertical straight line and are directed into a field produced by a horizontal-vertical electromagnetic deflection yoke at predetermined incident angles to each other so as to converge at a color screen, is provided with a magnetic yoke, for example, secured to the electron beam convergence plates at the end of the electron gun so as to be disposed in the path of the leakage flux produced by the horizontal-vertical electromagnetic deflection yoke, and thereby impart a further vertical or horizontal deflection field to at least one of the plural beams for correcting a deviation between the positions of rasters on the color screen produced by the plural beams.