Abstract: A magnetic head characterized in that a nonmagnetic material of an erasing core chip in which two erasing cores are coupled by the nonmagnetic material is provided with a groove portion and that a recording/reproducing core is inserted in the groove portion. The magnetic head can be fabricated by a method characterized by comprising the step of providing first and second orthogonal grooves in a face plate, the step of providing the groove portion in the nonmagnetic material of the erasing core chip, the step of inserting the recording/reproducing core in the first groove, inserting the erasing core chip in the second groove and inserting the recording/reproducing core in the groove portion of the nonmagnetic material, and the step of fixing the face plate, the recording/reproducing core and the erasing core chip with glass or the like and polishing a front surface of the face plate.

Abstract: A locking type pushbutton switch has a lock pin adapted to engage with a heart-shaped cam groove and comprised of a pin part and a mounting part. Portions of the mounting part adjacent the pin part are cut away to enable the pin part to be made longer. Therefore the pin part has sufficient flexibility, resulting in smooth operation of the lock pin. Moreover, the lock pin is held by the upper and lower cases, and the supporting plate and spring plate normally provided are no longer necessary.

Abstract: A serial printer suitable for use in desk-top calculators or the like. The serial printer has a rotary shaft rotatable together with two type wheels. The power supply to the rotary shaft is made by a motor which operates continuously only in one rotational direction through a first clutch. A second clutch is provided to make a selective power transmission between the rotary shaft and the member for actuating the hammer, as well as the member for causing the carrying operation. The states of the first and the second clutches are controlled by a change-over arm which in accordance with the operation instruction given by an operation instruction coil, such that these clutches are alternatingly turned on and off to make various operations such as printing, column shift, paper feeding and so forth.

Abstract: A slider arrangement comprises an insulator member, and two sliders each made of a resilient metal matel plate embedded in the insulator member and each having slender contacts exposed from the insulator mold member. The slender contacts of each of the sliders forms a pair of contact sets adapted to slide in contact with a resistive element and a collector member respectively, the pair of contact sets of one slider being located between the pair of contact sets of the other slider. A method of producing the above-mentioned slider arrangement comprises the steps of embedding a resilient metal plate having sliders into an insulator member, with contact forming portions of the sliders exposed, cutting off portions bridging the sliders and the contacts formed at the contact forming portions while holding the metal plate by the insulator member, and bending each of the contacts to its proper position.

Abstract: A slide switch having at least one row of terminals arranged along a substrate has a slider movable along the terminals. The slider carries a movable contact element biased resiliently towards the terminals so as to connect separate pairs of these terminals electrically together during movement of the slider. Each of the terminals has an exposed contact portion having an arcuate surface and the movable contact element has a generally corrugated shape formed by three arcuate protrusions forming convex surfaces facing the terminals and each spaced by trough portions presenting concave surfaces facing the terminals. In this way, the arcuate surfaces of the exposed contact portions can be adapted to fit within the trough portions upon movement of the slider into particular positions so as to stabilize the slider in these positions.

Abstract: A microwave circuit apparatus is disclosed which includes at least one first microstrip line; at least one second microstrip line; at least one capacitor interposed between the first and second microstrip lines; and a functional element having a first electrode thereof connected high frequency-wise to the first microstrip line, and in which the second microstrip line is grounded with respect to a power source.

Abstract: An auto-reverse type cassette tape player having a head base rockably mounted on the front side of a bed and carrying a pair of magnetic heads, so that the magnetic heads are switched in a seesaw-like manner as the tape running direction is switched as a result of a switching between two pinch rollers which cooperate with corresponding capstan shafts.

Abstract: In a presettable graphic equalizer for use in a car stereo or the like, a display device capable of two-dimensional display is disposed, whereby a frequency characteristic presently given to audio signals can be immediately known from the display of the display device.

Abstract: In a slide rheostat with first and second light sources wherein at least one set of resistor and collector is printed on an insulating base plate so as to establish a variable resistance, and wherein the first and second light sources are disposed so as to display the resistance in either of their emission colors, the light sources being connected to a common lead and at least one power supply lead so as to be energized; the improvement comprising the fact that the power supply lead is formed with a portion adopted to accommodate the sliders energizing both of the light sources so as to emit light in the composite color of their emission colors.

Abstract: A present position display device suitable for use on automobiles or the like vehicles, having a head member provided with a light-emitting element and a light-receiving element; a driving mechanism for driving the head member in the directions of an X and Y-axes; a mechanism for rotationally driving the driving mechanism; a sheet pack detachably mounted in the vicinity of and in parallel with the plane of movement of the head member; and a map transferrably disposed in the sheet pack; whereby the present position of the vehicle is indicated by the light coming from the light-emitting element on the map. Means are provided to read codes of specific positions marked on the map and to make an indication of the specific position as desired.

Abstract: A rotary pulse switch is disclosed in which contact pairs each consisting of a movable contact and a fixed contact are disposed along a radial face of the rotor so as to be closer to the center than the outer circumferential edge of the rotor. In this way, the width of a case into which the contact pairs fit can be made only slightly larger than the diameter of the rotor. A contact operating member for pushing a movable contact extends from the side of an operating member disposed in the proximity of the outer circumferential surface of the rotor between the two contact pairs and at substantially the same height as a projection of the operating member. Thus, the height of the case can also be reduced.

Abstract: A new and efficient input device of an electrode contact type which has a high mechanical strength and durability and can assure accurate detection of coordinates. The input device comprises an elastic flexible insulator spacer having a conductive element embedded therein which may be a gauze of thin wires of a good conductive material knit into the form of a grid. Upon depression of an insulator protective sheet, a portion of the spacer under the sheet is deformed to expose the conductive element downwardly therefrom thereby to short-circuit the element to a resistor layer under the spacer.

Abstract: A pen recorder has a carriage movable across a sheet of print paper and supporting a rotatable drum with a plurality of pen units mounted thereon. The carriage is movable between a pair of side frames through a print region and a nonprint region. When the carriage is moved by a stepper motor into abutment against one of the side frames which provides a stopper position, the relationship between the phase of the stepper motor and the position of the carriage is determined. Each time a print cycle is finished, the carriage is returned to a home position which is at the other end of the nonprinting region. A desired pen unit can be selected by reciprocating the carriage in an interval within the nonprint region, the interval being spaced from a preset number of increments of angular movement of the stepper motor.

Abstract: A new and efficient input device of an electrode contact type which has a high mechanical strength and durability and can assure accurate detection of coordinates. The input device comprises an elastic flexible insulator spacer having a conductive element embedded therein which may be a gauze of thin wires of a good conductive material knit into the form of a grid. Upon depression of an outermost insulator protective sheet, a portion of the spacer is deformed to expose the conductive element below and above therefrom thereby to short-circuit the element to first and second resistor layers under and on the spacer, respectively.

Abstract: A keyboard switch includes a lower-electrode insulating sheet provided with an electrode pattern formed by arranging lower electrodes at given distances, each of the lower electrodes being composed of a pair of electrodes having interfitted teeth; and an upper-electrode insulating sheet provided with an electrode pattern formed by arranging a plurality of lines of rectangular upper electrodes so that each of the rectangular upper electrodes crosses the corresponding pair of teeth of the electrodes of the lower electrodes at right angles.

Abstract: An electrical component comprises a holder having shaft holes and a plurality of rotary members each consisting of a shaft portion fitting into a respective shaft hole in the holder. Connection members formed unitarily with the rotary members each connects a rotary member to at east one other rotary members adjacent to it; and break-off portions formed on the connection member are capable of breaking easily from the rotary members when the rotary members are forced to rotate.

Abstract: Disclosed is a ceramic trimmer capacitor comprising a ceramic board having a substantially semi-circular stator electrode formed on one surface thereof, which is pressed and gripped between a rotor member composed of a metal and an insulating frame, wherein a plurality of arcuate convex portions are formed on the frame on the surface thereof having abutting contact with the ceramic board so that the periphery of the rotor member is supported by the arcuate convex portions. In this ceramic trimmer capacitor, the reliability of the stability against cracking of the ceramic board and the dependency characteristic of the electrostatic capacitance on the rotor load are highly improved.

Abstract: In furnishing an RF modulator with a reference signal generator for generating a specified test signal, and a switching circuit for switching a video signal and the test signal on occasion; the reference signal generator and the switching circuit are received in a shield case of the RF modulator, thereby to prevent radiated interferences.

Abstract: An electronically controlled governor for Diesel engines, having a computing circuit responsive to at least one signal indicative of an operating condition of the Diesel engine at each instant for computing positional data showing a target position of a fuel adjusting member for obtaining an amount of fuel injection corresponding to the operating condition and a correcting circuit for effecting a data correcting operation on the positional data in accordance with predetermined correction formulae. The coefficients in said data correction formulae are determined in accordance with the detected operating condition of the Diesel engine. Since the coefficients for correcting the control characteristic can be continuously changed in response to the operating condition of the engine, a stable and highly responsive governor characteristic can be realized without the use of a complicated circuit arrangement.

Abstract: A brush mounting structure of a miniature motor wherein brushes of the motor are fastened to bent end pieces of terminal plates, the terminal plates are fixed to a metallic bracket through a plastic film by means of insulating rivets, and the bracket is attached to an open surface of a case of the motor, whereby a soldering operation can be dispensed with.