Abstract: A system is provided for recording and/or reading information on the upper major surface of a flexible information storage disc. The system is comprised of a stationary surface or smoothing plane and a rotational drive member wherein the flexible disc is rotated over the stationary surface with the lower major surface of such disc facing the stationary surface. At least one opening is provided in the disc for receiving the rotational drive member and engaging therewith to provide the requisite rotation to the disc. The rotational drive member is essentially perpendicular to the stationary surface with the disc being free to move laterally along the drive member. Rotation of the disc causes the disc to rise above the surface, creating an air cushion between the flexible disc and surface. A recording and/or playback head is selectively passed over the upper major surface of the flexible disc for reading and/or writing information on the disc as it rotates.

Abstract: Disclosed are improved field-effect and bipolar semiconductor devices and the method of making them, wherein maximum junction control provides highly predictable device parameters. Low temperature epitaxial depositions provide tight junction thickness and resistivity control, and an orientation dependent etch forms grooves circumscribing portions of the host substrate and overlying epitaxial layers to provide dielectrically isolated single crystalline mesas utilized in forming electronic devices.

Abstract: An improved vehicle skid control braking system is provided of the type that selectively controls the engagement and disengagement of the brake system of the vehicle in accordance with selective braking conditions, such as, vehicle speed, wheel speed, road surface conditions, wheel speed "slip" conditions, etc.

Abstract: Disclosed is an improved optical thin film coating system comprising all essential elements of resistive and electron beam evaporation systems, chemical vapor deposition systems and reactive plasma deposition systems. Sequences of cleaning and deposition processes which previously required moving substrates through several chambers are performed in a single vacuum chamber. The evaporative sources also efficiently vaporize solid materials to provide reactive gases for reactive plasma and chemical vapor deposition processes, which were previously difficult or impossible to perform. Substrate movement, masking, and monitoring means previously used with evaporative sources are used to control thickness and uniformity of films deposited by chemical vapor and reactive plasma processes, to provide optical quality films.

Abstract: A variable gain RF input amplifier having an improved cross modulation characteristic using a field effect transistor. About the first 10 db of signal attenuation is effected by an AGC voltage applied to the transistor, following which supplementary attenuation is provided by an increasing reverse bias applied to a PIN-diode in the RF signal input path to the transistor, the diode bias being derived from the source circuit of the transistor.

Abstract: An improved vehicle skid control braking system is provided of the type that selectively controls the engagement and disengagement of the brake system of the vehicle in accordance with selective braking conditions, such as, vehicle speed, wheel speed, road surface conditions, wheel speed "slip" conditions, etc.

Abstract: Information is recorded and/or read on the upper major surface of a flexible information storage disc. The disc is contained within a housing to provide a cartridge or cassette, the housing protecting the recording surface of the disc. The housing includes an opening for receiving a rotational means coupled to a body having a cylindrical surface. The flexible disc is rotated over the cylindrical surface with the lower major surface of such disc facing the cylindrical surface so that rotation of the disc causes the disc to conform to the curvature of the body. An opening is provided in the housing exposing a portion of the upper major surface of the disc so that a recording and/or playback head is selectively passed over the recording surface of the disc for reading and/or writing information on the disc as it rotates.

Abstract: A completely electronic system for recording and subsequently displaying still life pictures includes an optical-electronic transducer for generating electronic signals responsive to an optical image. The signals are stored and subsequently applied to a visual display. Means are provided for applying the signals at a scan rate synchronized with the scan rate of the display to effect a stationary display of the optical image. Preferably, the display is a conventional television set.

Abstract: 1.

Abstract: An improved acoustic waveguide structure which comprises a ridge waveguide disposed in a horizontal direction extending outwardly from a substrate. The horizontal orientation of the waveguide which is in the form of a ledge results in particle motion of the ledge predominantly normal to the substrate plane with the largest motion at the free edge of the ledge and almost no motion in the substrate, thereby permitting a plurality of such structures to be densely packed on a common substrate.

Abstract: An accelerometer located on the pad of a vibratory seismic source provides a signal for comparison with the sweep signal which controls the vibrator. The error function representing the difference between the phases of these two signals is used to adjust the phase of the vibrator so as to maintain the vibrator in synchronism with the sweep signal. Prior to comparison with the sweep signal, the accelerometer output is conditioned by a tracking bandpass filter having its center frequency slaved to the instantaneous sweep frequency. Those components of the accelerometer output signal having a frequency equal to the instantaneous sweep frequency are passed by the bandpass filter and are subjected to approximately 0.degree. phase shift through the filter.

Abstract: Ultrasonic remote control receiver wherein reference frequency pulses are counted during a counting cycle comprising a predetermined number of received command signals, each command signal occupying a different frequency channel. At the end of each counting cycle, the reference frequency count is compared with the count during the preceding counting cycle. A validated output from the receiver occurs only after a predetermined number of uninterrupted identical comparisons have occurred. Interference with a validated output signal by spurious received signals e.g. noise signals is minimized by providing for invalidation of an output signal only after a predetermined number of uninterrupted non-identical count comparisons. Two of the receiver outputs are used to generate a variable duty cycle pulse train, one output increasing and the other decreasing the duty cycle. A receiver is disclosed in the context of a TV broadcast receiver wherein the variable level d.c.

Abstract: An improved acoustic waveguide structure which comprises a ridge waveguide disposed in a horizontal direction extending outwardly from a substrate. The horizontal orientation of the waveguide which is in the form of a ledge results in particle motion of the ledge predominantly normal to the substrate plane with the largest motion at the free edge of the ledge and almost no motion in the substrate, thereby permitting a plurality of such structures to be densely packed on a common substrate.

Abstract: An improved acoustic waveguide structure which comprises a ridge waveguide disposed in a horizontal direction extending outwardly from a substrate. The horizontal orientation of the waveguide which is in the form of a ledge results in particle motion of the ledge predominantly normal to the substrate plane with the largest motion at the free edge of the ledge and almost no motion in the substrate, thereby permitting a plurality of such structures to be densely packed on a common substrate.

Abstract: A photo-electric coupler, or isolator, wherein a semiconductor light emitter and a semiconductor photodetector are enclosed in a light transmissive body having a surface covering of light reflective material for reflecting toward the photodetector, incident light from the emitter. The emitter and detector can be disposed face-to-face or side-by-side. The reflective cover can provide an external protective covering for the device or a conventional housing can be used.

Abstract: A process for fabricating a monolithic integrated circuit having matched semiconductor devices and P-N junction isolation regions, with the collector regions for the semiconductor devices of one polarity type and the isolation regions being formed by up-diffusing impurities from a selected surface of a substrate of one conductivity type though an epitaxial layer of opposite conductivity type formed thereon, so that such collector regions are surrounded by material of opposite conductivity type, and the P-N junction isolation regions selectively isolate semiconductor devices of opposite polarity type from other circuit elements, wherein such collector regions and P-N junction isolation regions have retrograded impurity concentration profiles.

Abstract: A thermocompression welding device including a welding head having two tools for automatically and simultaneously effecting welds between a connecting wire and a pair of contact areas, one on a semiconductor chip and one on a housing for the chip. The weld head is transversed between consecutive weld positions using an X-Y table. The apparatus provides automatic adjustment of connecting wire length, and matched automatic adjustment of weld head separation, corresponding to different contact area spacings and automatic orientation of the welding head to correspond to different orientations of the pairs of contact areas. Preprogrammed lengths of wire are fed to the welding head from a continuous coil and bent into position for simultaneous engagement by both welding tools, the wire being severed adjacent one of the welds immediately following each welding operation.

Abstract: A logic gate using a single transistor having two emitters interconnected by a resistor which is center-tapped to the transistor base. The collector is connected through a load resistor to the DC supply rail.A logic gate using a pair of IGFETS having sources connected together, the drains connected through a common resistor to a DC supply rail. The gates are connected through diodes to the common sources of the channels.Various logic gate functions, including EXCLUSIVE-OR and EXCLUSIVE-NOR functions based on these gates.