摘要:
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.
摘要:
In a flexible disk drive having a main frame in which a flexible disk is inserted and a direct-drive motor having a stator disposed on a main surface of the main frame and a rotor including a permanent magnet, a gap between the main surface of the main frame and the permanent magnet is set at a distance so that the rotor does not fall due to gravity by attracting the rotor to the main frame by the magnetic attractive force of the permanent magnet even if the rotor is turned upside down to the stator.
摘要:
A male connector is connected to a female connector which includes a plurality of terminal hole pairs, each having a signal terminal hole and an earth terminal hole which are arranged in a first direction. The plurality of terminal hole pairs are arranged on the female connector body in a second direction perpendicular to the first direction. The male connector includes a male connector body, a plurality of signal terminal pins and a plurality of earth terminal pins. The signal terminal pins are provided on the male connector body, and are accommodated in the signal terminal holes respectively. The plurality of earth terminal pins are provided on the male connector body, and are accommodated in the earth terminal holes. The earth terminal pins are smaller in number than the earth terminal holes of the female connector.
摘要:
A motor rotatably driving a flexible disk has a rotor having an external peripheral side surface on which an index detection magnet is mounted. A main circuit board mounts a control circuit for carrying out a driving control of the motor and extends in a direction perpendicular to a rotation axis of the motor. Attached to the main circuit board, a sub circuit board extends in a direction in parallel with the rotation axis of the motor at a position close to the external peripheral side surface of the rotor. Mounted on the sub circuit board, an index detection Hall element has a magnetic field detection surface which is disposed so as to oppose to the external peripheral side surface of the rotor.
摘要:
The index signal generator generates an original signal every the rotor of the direct-drive motor rotates, and delays the original signal by a delay time to produce index signal. The index signal generator comprises, as the delay giving the delay time, the delay counter that can be set the initial value, instead of an analog delay circuit, a variable register and a capacitor. The delay counter comprises the counter and the counter value selector for determining the initial value of the counter. The counter starts to count the clock signals generated by the clock in response to the original signal, and stops counting the clock signals and generates the index signal when the number of the clock signals counted by the counter reaches the initial value.
摘要:
In an index signal generator for generating an index signal for use in a direct-drive motor having a rotation axis and comprising a stator and a rotor, a particular at least one of M magnetized elements is used as an index detection magnet having magnetic force which is different from those in remaining ones of the M magnetized elements. Wound around one of a specific one of particular three cores in the stator, an index detection coil detects variations of the magnetic force generated by the ring-shaped permanent magnet to produce a detected signal. On the basis of the detected signal, the index signal is generated.
摘要:
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.
摘要:
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.
摘要:
A mask has a mask body and a pair of ear straps. The mask body includes an outer layer sheet and an intermediate layer sheet. The outer layer sheet is formed of hydrophobic fibers. The intermediate layer sheet is laid on the outer layer sheet so as to be located on a wearer's side of the outer layer sheet when the mask is worn. The intermediate layer sheet includes a first fiber layer which is formed of polyolefin fibers containing an inorganic antimicrobial agent and a second fiber layer which is formed of polyolefin fibers and has a larger fiber diameter than the first fiber layer. The fiber diameter of the first fiber layer is within a range of 0.5 to 2.8 μm and the ratio of a particle diameter of the inorganic antimicrobial agent with respect to the fiber diameter is within the range of 0.1 to 6.0.
摘要:
It is an object of the invention to provide an effective technique for realizing a desired moisture releasing property, in a cosmetic puff having an air-laid non-woven fabric sheet formed of pulp fibers. A cosmetic puff 100 according to this invention includes an inner layer 110 in the form of a sheet and surface layers 120 in the form of laminated sheets on the both sides of the inner layer 110. The inner layer 110 is formed by an air-laid non-woven fabric sheet containing at least pulp fibers and polyethylene terephthalate fibers.