Abstract: The parametric amplifier includes plurality of parameter changing or exciting regions provided in a periodic array on a wave propagation medium having the property that waves having different frequencies travel through the medium at different velocities, so as to cause a parametric action only when a wave applied to the amplifier satisfies a predetermined condition relative to the dispersive nature of the medium.

Abstract: A portable room security alarm features a smoke detector alarm, a motion sensing intrusion alarm, a temperature sensing alarm, and a digital display alarm clock. The security alarm includes a deployable thermally conducting mounting clip for mounting the alarm at the top of a door with the clip extended to pass around the upper edge of the door. A deployable temperature sensor probe may be attached to the clip to give early warning of a fire outside the door. The temperature probe may alternatively be attached to other metallic structures passing through the door frame, e.g. door knobs, hinges, etc. Large ventilating apertures in an extensible telescoping housing allow access of smoke to the smoke sensor, and with the housing closed the sensor is sealed off against long term contamination.

Abstract: A fast-forwarding and rewinding levers operating mechanism in a tape recorder comprisig an FF (fast forward) lever element having formed therein a hook-shaped guide recess, a REW (rewinding) lever element superposed on the FF lever element and which has formed therein a hook-shaped recess so positioned in a direction opposite to said guide recess in the FF lever element as to intersect the latter guide recess, an oscillating member located under said FF and REW lever elements and having an oscillating portion provided at the intersection between said two guide recesses, and a transmission means to oscillate said oscillating member for a rotary medium to engage a reel base, said oscillating portion of the oscillating member being oscillated, by pressing said FF or REW lever element, to put said transmission means into action, thus revolving said reel base for FF or REW operation.

Abstract: A light-emitting diode displayer in which a substrate and a film-like substrate are adhered to each other and are electrically connected to each other by silver paste.

Abstract: A slow-blow electrical fuse structure features one or more conducting fuse links for high-current blow-out protection and located in individual chambers filled with arc-quenching filler and in thermal contact with a spring-loaded piston-and-guide structure soldered into an extended position and similarly soldered to one of the fuse links by an extension leading through a chamber-separating insulating partition washer. At overload the heat from the fuse links melts the aforementioned soldered junctions, causing the spring to collapse the piston over the guide, simultaneously withdrawing it from the chamber, thereby breaking the circuit. A similar chamber-defining washer is captively affixed to the opposite end of the piston-and-guide assembly affixed to the optional second fuse link, both partition-forming washers being rotatingly captively secured to the ends of the piston-and-guide assembly by specially configured apertures therein.

Abstract: A miniature thermal switch features simplified single-spring construction requiring only four components within an enclosure housing. None of the components requires subassembly, and all are designed for completely automated assembly of the finished switch. A fabrication method features self-alignment of the elements by means of closely confining barrier walls. A wiping action of the contacts during melting of a contact-restraining meltable pellet serves to insure an abrupt circuit interruption at the threshold temperature.

Abstract: A tape player is provided which has a tape player set and an operation board mounted on the front face of the tape player set. The tape player is particularly characterized in that a tape pack insertion aperture which is formed in a part of said operation board is closed or opened by a cover which is rotatable about a rod fixed on the front face of said operation board.

Abstract: Acoustic surface wave device comprising a lower electrode disposed on an elastic substrate and an upper electrode consisting of two comb-shaped electrodes disposed apart from each other, opposite to said lower electrode through a piezoelectric film covering said lower electrode, at least one of said lower and upper electrodes being constructed as an apodized electrode.

Abstract: A changeable sign comprises a support wall for changeable sign components having removably attached thereto a plurality of thin, flat, rectangular, flexible sign component pieces arranged in close contiguous rows so as to fill an entire sign-forming area of the sign and so that the sign component pieces from a distance appear to form a single sheet sign having one continuous flat surface. The sign component pieces are of two basic types, one type being indicia-containing sign component pieces having visible from the front faces thereof one or more numeric digits, symbols, and/or alphabet character indicia so as to form alone or with other adjacent sign component piece, numbers, words, and/or the like, and the other type being blank spacer component pieces which fit between adjacent indicia-containing sign component pieces.

Abstract: A lens system for a disc camera features a plurality of objective lenses of different focal lengths carried on a turret support that can be rotated into different stable positions in front of the framing area of the film disc to bring a selective lens into picture-taking position. An associated viewfinder adjusting system ganged for operation with the turret support projects a different framing mark pattern into the field of view, the projected pattern corresponding to the image field produced by the objective lens currently in position. A shutter releases inhibitor bars actuation of the shutter release unless an objective lens is properly positioned for exposure.

Abstract: A variable capacitor which comprises a capacity reading section including a capacity reading electrode which section is formed along a surface of a semiconductor crystal bulk having other sloping surfaces and at least one depletion layer control section including a control electrode which section is formed along the sloping surface. The thickness of a depletion layer within the bulk varies when the depletion layer control section is supplied with reverse bias voltage through the control electrode and the capacity variation then caused is read out at the capacity reading section.

Abstract: A still camera includes a housing having a film chamber that is open to one side of the camera housing and is designed for drop-in loading of the film cartridge and leader. A channel leads from this side of the camera to the film path and a cavity is located at one end of the film path for receiving the film cartridge while a cavity is located at the other end of the film path which houses a take-up spool. The take-up spool has a slot for receiving the film leader and the camera incorporates drive mechanism for automatically aligning the slot of the take-up spool with the channel when the chamber door is opened. The drive mechanism forms part of the film transport system.

Abstract: In a head shift mechanism in a tape player to shift a head to a reproducing position and hold it there by means of a solenoid driven by a driving signal from a solenoid driving device, an improvement comprising a solenoid driving signal generator, a counter connected to the solenoid driving signal generator for counting up solenoid driving signals from the solenoid driving signal generator, and a head shift stopping device connected to the counter for receiving count completion signal from the counter to actuate to stop action of the head shift solenoid.

Abstract: A still camera includes a housing having a film chamber for receiving a film cartridge having a film leader with the chamber defining a film path communicating with an edge of the housing through a channel. The film chamber also has a cavity at one end of the film path for drop-in loading of the cartridge in the direction of the plane of the film and a cavity at the opposite end housing a take-up spool. An imaging area is located at one side of the film path and a pressure plate is generally aligned with the imaging area on opposite side of the film path and biased towards the imaging area. A mechanism is provided for moving the pressure plate away from the imaging area to accommodate film loading and unloading, as well as film rewind.

Abstract: A manufacturing method for an MIS type semiconductor device features in the preferred form a single masking operation used to define source, gate, and drain windows simultaneously in an upper insulating oxide layer disposed over a semiconducting polysilicon layer, the polysilicon layer being separated from the semiconductor substrate by a thin insulating oxide layer serving as the gate oxide. By subsequent deposition of an overall capping nitride layer, followed by selective removal of layers, using relatively low resolution photoresist and portions of the layers themselves as intermediate etching barriers, and by finally converting the polycrystalline layer to an oxide except where it is protected from oxidation by the presence of a nitride stripe over a gate window, the resulting gate electrode is precisely centered between the source and drain windows, and is sealed on all three sides by a protective oxide layer.

Abstract: A pushbutton tuner arm mechanism features a lockable setting plate rotatably mounted on an arm reciprocatingly actuated by a pushbutton, the setting plate having an extension configured to engage a V-shaped tuning notch in a memory slide. A locking spring affixed to the arm peripherally engages portions of the setting plate to hold the arm in a chosen position, the locking force being releasable upon extraction of the pushbutton. An arcuate boss integral with the setting plate is configured to engage portions of a generally V-shaped cut in the arm to provide positive play-free locking of the setting arm in position.

Abstract: A pushbutton-operated waveband or station selector which comprises a tuning axis having a tuning knob and rotatably-mounted on a tuning axis mounting plate, an idler plate driving gear rotatably mounted on the plate, an idler roller or gear disposed between the tuning axis and the idler plate driving gear for transmitting rotation of the tuning axis to the idler plate driving gear; the idler roller or gear is rotatably mounted on a clutch lever operatively coupled on a kick arm and the idler plate driving gear is in meshing engagement with a rack gear of an idler plate operatively coupled on a core slide.

Abstract: An automatic linearity correcting circuit comprises a junction-type active element, a dual gate MOSFET, an AGC circuit to keep output signal from the dual gate MOSFET at a predetermined level and a correcting voltage applying circuit to convert AGC voltage to a voltage most suitable for linearity correction, so that output signal from the junction-type active element is applied to one of gates of the dual gate MOSFET, and correcting voltage from the correcting voltage applying circuit is applied to the other gate of the MOSFET.

Abstract: A panel mountable fuse holder for cartridge-type electrical fuses features a one-piece side terminal connection and a one-piece rear terminal connection. Both are configured for radial snap-in engagement with the fuse holder body. A novel capture mechanism in a sleeve disposed within an insertion knob assembly provides electrical contact to the forward fuse terminal without unduly stressing substantially misaligned caps. The capture mechanism also provides moderate rotational torque to the fuse during insertion, whereby the fuse is partially rotated to provide improved electrical contact to a planar ring structure integral with the rear terminal connection.

Abstract: A chip mounting substrate which comprises inserting holes formed in a substrate for inserting chips in, a sheet provided on the top surface of the substrate to cover the holes and having adhesivity on the inner surface covering the holes, and wiring pattern provided on the back surface of the substrate so as to be associated with electrode portions of the chips inserted in the inserting holes, so that after inserting the chips in the inserting holes to thereby temporarily adhere and fix them by the sheet, the electrode portion of each chip and the associated wiring pattern are soldered and connected together.