Abstract:
An oscillator circuit includes a dual-gate MOS field-effect transistor arranged in a Hartley oscillator configuration and operated in a manner to maintain the oscillator signal output level substantially constant over a wide frequency range.
Abstract:
A display system is disclosed which includes a multi-layer light control panel having a first transparent electrode, a photoconductor, a normally-transparent liquid crystal, and a second transparent electrode. A laser light beam is modulated with video information and raster scanned to the photoconductor. A direct-current potential is applied across the electrodes during the scanning of a frame, so that spatial variations are created in the light transmissivity of the liquid crystal. During a first portion of a vertical retrace period, a short circuit is placed across the electrodes, and a flash lamp is projected through the light control panel to a display screen. During a second portion of the vertical retrace period, an alternating current potential is applied to the electrodes to restore the liquid crystal to its transparent condition.
Abstract:
Prior to assembly of the envelope of a focus grill tube, the cup-shaped panel portion of the envelope is wound with a wire helix which is disposed around and along the panel, each turn of the helix extending across the open side of the panel in predisposed relation with a pattern of phosphor strips on the bottom wall of the panel. Preferably, the helix turns are disposed in grooves in the end surface of the side wall of the panel, and portions of each helix turn are disposed about a member having a thermal expansion greater than that of the helix wire.
Abstract:
A microwave delay line includes a first path of negligible delay time, a second path providing a predetermined delay time determined by a delay line section terminated by a one port reflection type amplifier, and a control for selectively feeding a microwave signal over one of the paths. A signal can be held in the delay line section of the second path to thereby impart a desired delay to that signal.
Abstract:
A plurality of storage electrodes, extending in the column direction, each electrode coupled to a common semiconductor substrate at spaced regions along its length, each such region comprising a minority carrier storage location. A plurality of digit lines are formed in the substrate, each such line being coupled to a column of locations. These lines serve as sources of minority carriers and as sense lines. A plurality of word lines extending in the row direction are located one over each row of locations. Each word line can be operated to create conduction channels between the digit lines and the storage locations, respectively, along that word line.
Abstract:
THE RATE OF PLATING COPPER ONTO AN ACTIVE METALLIC SURFACE OF A SUBSTRATE FROM AN ELECTROLESS COPPER PLATING SOLUTION IS ENHANCED BY ADDING TO THE PLATING SOLUTION AN IONIC COMPOUND CONSISTING OF EITHER AN ACETATE, A NITRATE, AN OXALATE, A LACTATE, A CHLORIDE, A TARTRATE, A FORMATE, A PHTHALAE, A TUNGSTATE, A MOLYBDATE, A CHLORATE, A PERCHLORATE, A CITRATE, A MOLONATE, OR MIXTURES THEREOF.
Abstract:
A threshold gate comprising a plurality of complementarysymmetry, field-effect transistor inverters, each inverter receiving at its common gate connection a different input signal and each connected at its output terminal to a common circuit output terminal. The gate may have inputs all of the same weight or, with appropriately chosen values of transistor conduction channel impedance or parallel connected inverters, may have inputs of different weight.
Abstract:
A dual mode automatic phase controlled oscillator system employs multiple keyed phase comparators to produce control signals which are applied to lock the oscillator frequency and phase to a reference signal. One of the keyed comparators is continuously employed to produce an in-sync control signal. A coincidence gate is utilized to detect the existence of out-of-sync conditions, and associated circuitry produces a mode control signal which is applied to activate the second keyed phase comparator upon such occurrence. The second keyed comparator is thereby selectively operative during out-of-sync conditions to develop an additional control signal to enhance the pull-in characteristics of the system.
Abstract:
A voltage dependent resistor is cooperatively coupled with a keyed automatic gain control device to provide control signals sufficient to bias off the radio and intermediate frequency amplifier stages of a television receiver when the amplitude of the keying pulse reflects an open-circuiting of a horizontal retrace capacitor which raises the developed high voltage to an excessive level.
Abstract:
The apparatus is a generally opaque disc mounted in the camera tube light path for rotation about an axis vertically displaced from the light path and having two like, diametrically opposed and generally arcuate apertures with such configurations that different horizontal areas of the photosensitive target electrode of the tube are successively and equally exposed to light from a subject during each scanning field.