Abstract: A magnetic disk chucking mechanism comprises a disk table (21) having an aperture (21a) formed at a position apart from the center of the disk table (21), an arm (22) attached to the lower surface of the disk table, and a roller 23 held by the arm and protruding from the upper surface of the disk table (21) through the aperture (21a). The arm (22) has elasticity and is directly fixed to the disk table (21) at least at one position apart from the roller (23). The roller (23) is held by the arm (22) to be movable within the aperture (21a) at least in a radial direction of the disk table (21).

Abstract: A tape guiding pole angle adjusting mechanism for a magnetic tape recording/reproducing apparatus including a base portion, a tape guiding pole, a sub-arm on which the tape guiding pole is fixed, a sub-arm supporting mechanism, and an adjusting screw mechanism. The sub-arm supporting mechanism supports the sub-arm in a manner making an inclination angle of the tape guiding pole changeable, and the adjusting screw mechanism is capable of making a fine adjustment of an inclination angle of the tape guiding pole.

Abstract: A wireless data input device requiring no cable for connection to the keyboard or to the pointing device. A wireless keyboard 16 incorporating a pointing device has a data encoder 21 and an RF transmitter 22, and transmits the key data and the pointing cursor data to the reception unit 3 which is connected to a keyboard connector 6 and to a mouse connector 7 of a computer 1 through connection cables 8 and 9. The reception unit 3 has a data decoder 11 and an input/output control unit 12, and decodes the received data and inputs them to the computer through bidirectional communication.

Abstract: In a magnetic head in which a gap portion of a core is interposed between an opposed slider and a holding slider and a coil is set in a coil portion of the core, the opposed slider is made of a glass or ceramic material having excellent wear resistance and the holding slider is made of a resin material. The core has an end face thereof brought into contact with a magnetic disk. The opposed slider has a magnetic disk sliding surface that is opposed to a core of a counterpart magnetic head while interposing the magnetic disk between the magnetic disk sliding surface and the core of the counterpart magnetic head. The holding slider stabilizes the position of the core.

Abstract: A magnetic head carriage device includes a carriage base on which a lower head is mounted, and an upper arm on which an upper head confronting the lower head is mounted, the upper arm having a width in a lateral direction and a base portion at which the upper arm is fixed to the carriage base, the upper arm being vertically movable to the carriage base around the base portion. A head load spring exerts a downward actuating force on the upper arm such that the upper arm is pressed toward the carriage base, the head load spring having an end portion at which the head load spring downwardly presses the upper arm and a base portion at which the head load spring is fixed to the carriage base. A spring guide mechanism restricts a movement of the end portion of the head load spring in the lateral direction such that the end portion is maintained in the center of the width of the upper arm.

Abstract: There is provided a magnetic recording/reproducing apparatus using a plastic chassis having side walls integrally formed with a bottom plate. A cassette holder holding the cassette case moves between a loaded position and an ejected position. A pair of pins are protrudingly provided on side surfaces of the cassette holder. One pin of the pair of pins is provided on a left side surface, and the other pin is provided on a right side surface. The plastic chassis has a bottom plate and left and right side walls formed perpendicularly on the left side and the right side of the bottom plate. The bottom plate and the left and right side walls are integrally formed with each other. A pair of slots are formed on the left and right side walls, one slot of the pair of slots being formed on the left side wall, the other slot being formed on the right side wall. The cassette holder is movably supported by the pins being inserted into the respective slots between the left side wall and the right side wall.

Abstract: A magnetic tape apparatus includes a head which reproduces data from or records data onto a magnetic tape, taken out from a cassette, when the tape is running. A supply reel shaft rotates a supply reel to supply the tape from the cassette to the head. A take-up reel shaft rotates a take-up reel to wind the tape from the head around the take-up reel. A back tension applying mechanism has a brake part which presses the supply reel shaft to produce a braking force on the supply reel shaft, the back tension applying mechanism applying a back tension to the tape when the braking force is produced. A pressing force varying mechanism controls a pressing force of the brake part on the supply reel shaft such that the pressing force is maintained at an appropriate level for a type of cassette.

Abstract: A tape cassette loading apparatus includes: a cassette holder which moves a tape cassette to a loaded position when the tape cassette is inserted to move the cassette holder; a lid opener, including a rotatable portion, which opens a lid of the tape cassette when the tape cassette is inserted to bring the lid into contact with the rotatable portion of the lid opener; a cam slider which locks the cassette holder to a chassis when the tape cassette is not inserted; a first protecting unit which cancels the locking of the cassette holder to the chassis by moving the cam slider when the first protecting unit is rotated by the lid of the tape cassette; and a second protecting unit which includes a first portion connected to the first protecting unit and a second portion connected to the chassis.

Abstract: An antenna unit for use in a navigation system includes a bottom cover and a unit case, a circuit board and an antenna main body are stored in the bottom cover, a cylindrical storage portion in the bottom cover is for storing the circuit board and the antenna main body therein, the cylindrical storage portion being formed integrally with the surface of the bottom cover, a cylindrical joint portion being threaded with the cylindrical storage portion, said cylindrical joint portion being formed integrally in the unit case, and the cylindrical joint portion being threaded with the cylindrical storage portion.

Abstract: A head feeding mechanism in a magnetic recording and reproducing device comprises: a "0" side carriage which has a "0" side magnetic head mounted on the surface of the front end portion thereof, and is fed in the direction of length of a slot formed in a magnetic disk holder, into which a magnetic disk is loaded, by a guide provided on a device frame; and a "1" side carriage which has a "1" side magnetic head 16 mounted on the surface thereof which is confronted with the "0" side magnetic head, and a base which is flexibly supported on the base 1a of the "0" side carriage, and driven ears extended from the middle portion thereof which are driven by the edge of the slot with the aid of an energizing spring.

Abstract: An optical disk writing device includes an optical disk drive recording data into an optical disk and having no harddisk as a data buffer, and a host computer controlling the optical disk drive and transferring the data to the optical disk drive by using a data storage connected to the host computer as a data buffer for the transferring and the recording.

Abstract: An AC-DC adapter includes a power transformer to which an AC voltage is applied, a rectifier circuit for rectifying and smoothing an AC voltage developed across the secondary side of said power transformer, and DC voltage stabilizing member for stabilizing a DC voltage outputted by said the rectifier circuit.

Abstract: In a first step of an optical disk write method, an area for logical format information is reserved on an optical disk; in a second step, variable-length packets, each packet comprising a demarcation block and a variable-length data block including a new file or a corrected file, on a data area, in response to a write instruction for writing the new file or the corrected file; in a third step, a volume history indicating a logical structure of files is maintained and file logical information for written and deleted files is chronologically appended to the volume history; in a fourth step, logical format information of the optical disk is produced based on the volume history, in response to an instruction for finalization; and in a fifth step, the logical format information, a lead-in area and a lead-out area are provided on the optical disk.

Abstract: A compact pointing device of a novel constitution featuring high operability. A disk-like operation unit 4 is disposed on the PC substrate 8 via an annular resilient stopper 7. Magnets 11, 12, 13 and 14 are arranged on the lower surface of the operation unit 4 along the circumference thereof maintaining an angle of 90 degrees. Hall elements 15, 16, 17 and 18 are arranged on the upper surface of the PC substrate 8 opposed to the magnets 11, 12, 13 and 14. A processing circuit is mounted on the PC substrate 8 to convert the changes in the output voltages of the Hall elements 15, 16, 17 and 18 into moving amounts of the cursor in the predetermined directions.

Abstract: In a cleaning mechanism for a magnetic head which mechanically cleans a recording/reproducing face of a magnetic head by using a cleaning brush, a basal portion of which is supported by a device fixing portion, a resin block is fixed to an end portion of an L-shaped brush stem of the cleaning brush, the brush stem being made of a metal plate, and a number of brush pieces which are to come into contact with the recording/reproducing face are formed integrally with the resin block.

Abstract: In an overdischarge detection device which is connected between positive and negative load current lines for connecting a chargeable electric cell with a load and which comprises an overdischarge detection circuit including a voltage comparing section for detecting that a cell voltage of the electric cell falls below a threshold voltage to prohibit discharging operation, an adjusting circuit connected to the overdischarge detection circuit detects a particular voltage of a specified part that corresponds to a load current varying in response to relative weight of the load to adjust the threshold voltage on the basis of the particular voltage. Preferably, the adjusting circuit may be constructed so as to clamp the threshold voltage when the particular voltage is higher than a predetermined voltage.

Abstract: A magnetic tape apparatus in which data is recorded on or reproduced from a magnetic tape when the magnetic tape is run on a rotary drum, includes a tension regulating unit which regulates a tension of the magnetic tape when the magnetic tape is run, the tension regulating unit pressing the magnetic tape at a first position in a tension-applying direction. A slack preventing unit exerts a rotating force on the tension regulating unit at a second position such that the rotating force exerted at the second position acts on the tension regulating unit at the first position to further press the magnetic tape in the tension-applying direction, thus preventing a slack of the magnetic tape from being produced when changing a tape winding direction of the magnetic tape.