Abstract: A sheet material for a pressure-sensitive detecting device has a corrugated and electrically conductive net having a multiplicity of corrugations on each side thereof and covered by an electrically insulating material. The net is embedded in an electrically insulating material, except for its corrugations which are exposed from the insulating film and the insulating material.

Abstract: A magnetic tape guide drum for a magnetic video recording and playback apparatus has a rotary magnetic head and is adapted for guiding a magnetic tape traveling spirally about the drum. The drum includes a rotary drum portion, a stationary drum portion and a shaft secured to the rotary drum portion and supported rotatably by the stationary drum portion for rotating the rotary drum portion. A grounding device is provided in the stationary drum portion and held in sliding contact with the peripheral surface of the shaft.

Abstract: A manual paper feed mechanism for a printer has a release lever adapted to permit mounting and demounting of a print paper to and from a platen, a paper feed gear for rotating the paper feed roller, a manual knob having a peripheral gear section engageable with the paper feed gear, and a manual lever supporting the manual knob rotatably and swingably towards and away from the paper feed gear. In addition, the mechanism has a first cam portion formed on the manual lever, and a second cam portion engageable with the first cam portion and formed on the release lever, such that the release lever is rotated in response to the operation of the manual knob and the paper feed gear in engagement with each other. This arrangement selectively permits the manual feed of the print paper by the manuel knob.

Abstract: In a device wherein electric components and rotary knobs for operating them are disposed in a case with the rotary knobs extending partially through respective slots formed in the upper surface of the case, the improvement comprising the fact that the rotary knobs are arranged in two rows and staggered with a barrier formed between the two rows.

Abstract: A liquid crystal composition which comprises a liquid crystal compound having a smectic C phase and an optically active substance, both of said liquid crystal compound and optically active substance being compounds having an ester type bond in the molecular structure, and which has a lowered transition temperature region for the smectic C phase, is chemically stable and stable for use in field effect type liquid crystal display elements etc.

Abstract: A magnetic recording medium for perpendicular magnetization includes a base of a nonmagnetic material, a first magnetic layer of a soft magnetic material on a surface of the base, a second magnetic layer having perpendicular anisotropy on a surface of the first magnetic layer, the second magnetic layer being magnetized in a transverse direction thereof. The second magnetic layer is composed of a three-element alloy of cobalt, chromium, and hafnium, cobalt being a main component with chromium and hafnium added thereto.

Abstract: A magnetic head unit comprises erase heads on both sides of a read/write head and an erasing back core having the -shaped cross section consisting of a magnetic material. The back core is engaged with the open end of a rear part opposing to the gap forming region in front of the cores of both erase heads, thereby ensuring high magnetic efficiency, receiving lesser influence of external magnetic field, and improving the magnetic characteristic and back core mounting work efficiency.

Abstract: A composite switch equipped with a main switch whose contact is connected and disconnected by an operation member and a change-over switch whose contact is changed among plural positions. An auxiliary switch is provided in series with the main switch, whose switching member is positioned so that it is driven by a working member for operating the contact of the change-over switch.

Abstract: A disc clamp device comprises a turntable formed at its center with a concave portion, an elevatable frame with a shaft, and a clamp member mounted on the shaft. The clamp member has in an integral form an arm supported by the shaft, pressing faces formed at the tip of the arm in opposition to the turntable, and guide portions extending from the inside of the pressing faces in the direction of fitting in the concave portion of the turntable.

Abstract: Disclosed is a magnetic disk comprising a center hub directly/indirectly fixedly attached to a central hole portion of a disk-like magnetic storage medium, a circular center hole formed at a central portion of the center hub for receiving a driving spindle inserted thereinto, and a groove annularly formed in an inner wall of the center hole for receiving portions of members provided at the driving spindle side. The member may preferably be balls. The balls are sandwiched between a center hub bearer rotatably attached on the driving spindle and a ball pressing fixedly provided on the driving spindle.

Abstract: In a magnetic head having a write/read layer for writing and reading data, erase layers for erasing edge portions of recording newly written in a writing operation and recording previously written, and an erase-back core, the improvement wherein the erase-back core is made of metal magnetic material and has side clamping pieces for clamping the core on both sides of the erase layers.

Abstract: In an optical fiber sensor comprising an optical fiber coupled with a light emission element and another optical fiber coupled with a light receiving element, end portions of the optical fibers other than those coupled with the aforementioned elements being arranged side by side and joined together in a closely contacting relation with the end surfaces of the optical fibers placed in opposition to a slit member to be detected such that the arranged direction of the optical fibers is aligned with a shifting direction of the slit member; the end portions of the optical fibers are formed into a flat configuration and joined together such that the flat side surfaces of the two fibers are brought into a surface contacting relation.

Abstract: An elastic surface wave element which has a grille-shaped electrode formed on a piezoelectric substrate is improved by having the grille-shaped electrode portion thereof covered with an insulating film made of tantalum pentoxide or silicon nitride. The insulating film functions to minimize the degradation of properties suffered by the conventional elastic surface wave element and preclude substantially completely the phenomenon of short-circuit between the electrode bars of the grille-shaped electrode.

Abstract: A switch including a self-cleaning mechanism comprises a slider movable in directions toward and away from fixed contacts, a moving contact, having flanges, contactable with the fixed contacts, and a spring for pushing the moving contact toward the fixed contacts. The slider has rest portions upon which the flanges abut under the state where the moving contact is in the inclined pose with respect to the slider-moving direction.

Abstract: A method of generating character patterns to be printed on a printer, wherein each character is divided into line segments in the X or Y axis direction or 45.degree.-angle direction on the X/Y coordinates. Segments are processed in pairs of contiguous, linked lines. The method eliminates the need for storing positional data for the node of linked lines, whereby the capacity of memory for storing numerous complex character patterns can be saved.

Abstract: A multi-direction joystick device has an operation shaft swingable in plural directions. The operation shaft has switch-pushing arm portions extending radially from the shaft and returning elastic plates also extending radially beyond the tips of the arm portions in separation from the arm portions.

Abstract: A pushbutton switch which includes a casing having a bottom wall and a top wall, and a switch device disposed in the casing on the bottom and composed of a relatively thin case having a flexible presser and accommodating a movable contact sheet, a spacer, and a fixed contact therein in stacked relation. A stem is disposed in the casing for movement toward and away from the switch device, and a plate spring is disposed above the flexible presser and curved toward the stem. An actuating member is disposed in the stem for movement toward and away from the switch device, and a spring is disposed between the actuating member and the stem for urging an upper portion of the stem to project through the top wall of the casing and also urge the actuating member into pressing contact with an upper surface of the plate spring. The flexible presser has on an upper surface a presser projection and on a lower surface a contact presser projection.

Abstract: A recording and reproducing device records and reproduces signals in and from a disk cartridge having slots defined in lateral edges thereof and housing a magnetic disk, a magnetic head insertion hole, a shutter for opening and closing the magnetic head insertion hole, a shutter actuator projection slidably disposed in one of the grooves defined for actuating the shutter. The recording and reproducing device comprises a frame having a cartridge insertion hole for the insertion therein of the disk cartridge, opening and closing actuator projections held in resilient contact with the bottoms of the grooves, respectively, for actuating the shutter actuator projection in engagement therewith while the disk cartridge is inserted through the cartridge insertion hole into the frame, and stopper members disposed laterally of the opening and closing projections for preventing the latter from being laterally displaced beyond a distance smaller than the length of projection of the shutter actuator projection.

Abstract: A printer comprising a printing mechanism, a control circuit which controls said printing mechanism and a power supply including battery, wherein said power supply provides the first stabilized power source circuit which converts an output voltage of said battery to the predetermined first supply voltage and then supplies it to said printing mechanism and the second stabilized power source circuit which converts an output voltage of said battery to the second supply voltage which is lower than said first supply voltage and then supplies it to said control circuit, and moreover a detecting circuit, which is composed of a transistor and resistors and detects that difference between the supply voltages of said first stabilized power source circuit and second stabilized power source circuit has reached a value lower than the predetermined threshold value, is also provided, and moreover the printing operation is controlled on the basis of an output signal of the detecting circuit.

Abstract: An X-Y input device known as a "mouse" includes at least one switch lever having a control end exposed through an upper case and an opposite end staked on the upper case. An annular holder for the rotatable ball of the mouse is secured to a lower case and the switch lever has a portion close to the staked end held between the upper case and the annular holder.