Abstract: In an FDD control apparatus for controlling a floppy disk drive for driving a floppy disk loaded in the floppy disk drive, an FDD control part including a floppy disk controller (FDC) is disposed in an FDD side in lieu of a host side (a SET side). The host side (SET side) is loaded with a USB connector connected to the FDD control part. The FDD control part includes a flash ROM for storing a program for adjusting a step timing of a stepping motor.

Abstract: A diskette type electronic device is attached to a reader/writer for recording and reproducing information on and from an information recording medium provided therein. In the electronic device, a diskette case having a shape substantially identical with a diskette provided with a magnetic disk as the information recording medium. An IC memory is provided as the information recording medium. A communicator communicates information to be recorded on or reproduced from the IC memory with the reader/writer. A detachable power supply unit includes a rechargeable secondary battery which supplies power to the IC memory and the communicator.

Abstract: In an FDD control apparatus for controlling a floppy disk drive for driving a floppy disk loaded in the floppy disk drive, an FDD control part including a floppy disk controller (FDC) is disposed in an FDD side in lieu of a host side (a SET side). The host side (SET side) is loaded with a USB connector connected to the FDD control part. The FDD control part includes a flash ROM for storing a program for adjusting a step timing of a stepping motor.

Abstract: A digital audio player comprises a semiconductor memory device for rewritably recording digital audio data and a digital audio reproducing unit for converting the digital audio data into analogue audio data and for reproducing the analogue audio data. The digital audio player comprises a casing which has the same shape as that of a cassette tape and which contains the semiconductor memory device and the digital audio reproducing unit. The digital audio reproducing unit comprises a digital/analogue converter for converting the digital audio data recorded in the semiconductor memory device into the analogue audio data and an output head for outputting the analogue audio data converted by the digital/analogue converter to a reproducing head of a cassette tape player for reproducing the analogue audio data recorded in the cassette tape.

Abstract: In an FDD control apparatus for controlling a floppy disk drive for driving a floppy disk loaded in the floppy disk drive, an FDD control part including a floppy disk controller (FDC) is disposed in an FDD side in lieu of a host side (a SET side). The host side (SET side) is loaded with a USB connector connected to the FDD control part. The FDD control part includes a flash ROM for storing a program for adjusting a step timing of a stepping motor.

Abstract: In a photointerrupter comprising a light emitting diode and a photo transistor which are opposed to each other, the photo transistor has an emitter which is grounded through a resistor while the light emitting diode has a cathode which is connected to an input terminal of a one IC chip for controlling a flexible disk drive. The one IC chip incorporates a constant current source which is connected to the input terminal through an npn-type bipolar transistor. The one IC chip incorporates a logic circuit having an output terminal which is connected to a base of the npn-type bipolar transistor.

Abstract: A structure for preventing head judder of a magnetic disk drive is disclosed. The structure comprises an opening provided at front end portion of an upper plate of a head carriage, a gimbal disposed within the opening, a magnetic head hangingly disposed on a central lower face of the gimbal, a pivot spacer disposed between the upper plate and a central upper face of the magnetic head, and at least one pair of adhesive tapes, inner ends of the adhesive tapes are respectively stuck on near central upper face of the gimbal, and the adhesive tapes symmetrically extend towards right and left end of the gimbal.

Abstract: In an integrated circuit for use in controlling a flexible disk drive for driving a flexible disk loaded therein, a power on reset circuit produces a reset signal after a predetermined time duration elapses where a power supply voltage is stable from a time when a power supply is applied. The power on reset circuit comprises a voltage detecting circuit for detecting a power supply voltage to produce a voltage detected signal and a delay circuit for producing, responsive to the voltage detected signal, the reset signal after the predetermined time duration elapses. Disposed between a selectable function circuit and a logic circuit, an output holding circuit holds output signals of the selectable function circuit as held signals and supplies the held signals to the logic circuit. The output holding circuit consists of two D-type flip-flops which are disposed in correspondence with two output signal lines of a logical circuit.

Abstract: A DD motor in a magnetic disk drive is disclosed. The DD motor comprising a sheet of metal plate formed in a two-stage disk-shaped, which includes an upper stage portion having an opening at the center thereof and a lower stage portion provided continued from the upper stage portion, a spindle shaft served as a central axis of the DD motor and inserted into the opening of the upper stage portion, and a resin portion formed integrally on a top face and a back face of the upper stage portion, in which magnetic material powder is mixed, wherein the resin portion connects the spindle shaft and the metal plate uniformly. Central axes of the small diameter disk-shaped upper stage portion and the large diameter disk-shaped lower stage portion are located coaxially. A peripheral edge of the upper stage portion is bent downwards to form a rim.

Abstract: A cramping structure of a guide bar for a head carriage in a magnetic disk drive is disclosed. The structure comprises a head carriage, a guide bar provided in parallel to the head carriage, a guide bar cramp provided along the guide bar in opposite side of the head carriage, wherein the head carriage includes a long plate-like base and a pair of cramp arms having a slit respectively, and extending from both ends of the base to the side of the guide bar which faces to the head carriage such that the cramp arm covers above of the guide bar; and a pair of engaging pieces provided under the pair of cramp arms respectively, wherein the pair of engaging pieces respectively includes a projection engaging the slit of the cramp arm and a notch supporting the guide bar from below thereof, wherein the pair of cramp arms urges the guide bar downwards, and the urging forces are received by the pair of notches of the engaging pieces.

Abstract: A sub-printed board 40 is disposed on a main plate of a main frame 30 at a position close to a front bezel 37. A main printed board 31 is provided on the main plate at a position opposite to the front bezel. A rotation drive mechanism for magnetic disks is mounted on the sub-printed board. A loading mechanism is assembled over the rotation drive mechanism in order to mount and eject the magnetic disks on and out of the magnetic disk drive. A head carriage 34 is disposed above the main printed board by means of a first supporting member provided on the main plate.

Abstract: In a floppy disk driver controlling circuit which is for use in controlling a floppy disk driver including a stepping motor (23) and which comprises a stepping motor driver (21) for producing a driving current to drive the stepping motor and a control section (22) for controlling the stepping motor driver, each of the control section and the stepping motor driver includes CMOS transistors as switching transistors. A combination of the control section and the stepping motor driver is formed as a single CMOS integrated circuit (25). The stepping motor driver produces the driving current between 80 mA and 250 mA, both inclusive, to drive the stepping motor when the stepping motor has a diameter which is substantially equal to 15 mm.

Abstract: An improved disc drive is capable of compensating the relative positional shift of a head caused mainly by a temperature change. The disc drive includes a frame having a disc holder for rotatably driving a disc, a head for reading information recorded in the disc, a head carriage which is movable in a predetermined radial direction of the disc, a rotation shaft extending in parallel with the radial direction, a driving mechanism for moving the head carriage in the radial direction by engaging with the rotation shaft, an adjustment mechanism for compensating the positional shift of the head due to a change of ambient temperature by providing an additional deformation of the adjustment mechanism to the carriage.

Abstract: A control circuit adapted to control a motor includes a first circuit part for generating an excitation current to be supplied to the motor and having a predetermined period that is dependent on a predetermined rotation period of the motor, and a second circuit part for superimposing on the excitation current pulses having a period that is small compared to the predetermined period of the excitation current.