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: An electrical connector has a main unit with and integral row of parallel connector pins. A first end of each connector pin is at a front of main unit and a second end is at a rear of main unit. Each parallel connector pin is bent downward toward the back so that they project downward from the bottom surface of main unit. A socket shield made from a thin plate surrounds the upper and lower surfaces and the two side surfaces of main unit. A pair of substrate fixing claws project downward from the sides of the lower surface at the rear of main unit. The socket shield also has an engagement piece projecting downward from the front region of the lower surface. The pair of substrate fixing claws and the engagement piece both engage the mounting substrate when the electrical connector is mounted on the mounting substrate.

Abstract: In a large-capacity flexible disk having a case accommodating a magnetic disk medium, the case is provided with a single large-capacity identifier hole formed in the vicinity of a write protection hole to discriminate the large-capacity flexible disk from a small-capacity flexible disk. The large-capacity flexible disk is one of a plurality of types having storage capacities different from one another. The case is further provided with type identifier holes selectively formed to identify the type of the large-capacity flexible disk so that the type of the large-capacity flexible disk can be identified with reference to the number and the position of the type identifier holes. A high-density type flexible disk drive, moreover, is provided with a large-capacity detecting switch at a position corresponding to the large-capacity identifier hole.

Abstract: A magnetic disk drive comprises a disk holder (10) for holding a magnetic disk, a carriage with a magnetic head mounted thereon, a linear motor for moving the carriage, a lock lever (52) for locking the carriage in cooperation with an ejecting operation of the magnetic disk held in the disk holder, and an eject lever (51) for ejecting the magnetic disk from the disk holder. The lock lever and the eject lever are integrally formed as a single unit. The magnetic disk drive further comprises a lock lever locking mechanism (60) for locking the lock lever in a locking state where the lock lever is locking the carriage.

Abstract: A disk drive includes a disk tray for introducing a disk into a disk drive main body. The disk tray includes a disk mounting part. The disk mounting part includes a main part having a dimension compatible with the disk, extensions, and tongue parts. The extensions and the tongue parts latch a portion of the disk so as to support the disk in an upright position.

Abstract: A magnetic head in which a holder (25) of a nonmagnetic material is connected to a magnetic head core (20) by bonding, wherein protrusion portions (26 and 27) are integrally formed on the holder (25) so that the protrusion portions (26 and 27) are made to pass through the magnetic head core (20) and top end portions (26a and 27a) of the protrusion portions (26 and 27) are thermally fusion-bonded to the magnetic head core (20) to thereby connect the holder (25) to the magnetic head core (20).

Abstract: A circular polarization microstrip line antenna transmits and receives right-handed and left-handed circularly polarized waves by one microstrip line antenna. A dielectric sheet 3 is laid on a metal base 4, and a flexible film 2 is laid on the dielectric sheet 3. Microstrip lines 5 are formed at the right and left sides of the surface of the flexible film 2. Rectangular waveguides 8 are arranged under the right and left ends of the metal base 4, a hole 9 is perforated at the upper surface of the rectangular waveguide 8, a hole 10 is perforated at the positoin opposed to the hole 9 of the metal base 4, and inverted L-shaped feeding pins 11 are inserted to the holes 9 and 10. The horizontal part 13 of the feeding pin 11 is interposed between the flexible film 2 and the dielectric sheet 3, and the horizontal part 13 is opposed to the right and left ends 5a of the microstrip line 5.

Abstract: A PCMCIA (Personal Computer Memory Card International Association) expansion PC (Personal Computer) card arranged to be inserted into a PC card slot formed in a portable personal computer as, for example, a radio having an FM teletext broadcast receiving function is disclosed. The PC card is composed of a plate-like card portion arranged to be inserted into the PC card slot and a cover box portion having a thickness larger than that of the card portion. The card portion and the cover box portion are formed individually from each other and separably connected to each other. The card portion has a top cover and a bottom cover having extension portions arranged to be inserted into an insertion opening of the cover box portion, respectively. An internal connector is mounted on a circuit board included in the cover portion to connect with an included connector mounted on a circuit board which is accommodated in the cover box portion.

Abstract: A disk device includes a drive mechanism having at least a disk motor and an optical head, the disk motor rotating a recording disk, and the optical head accessing the disk to reproduce information from the disk and/or record information in the disk. A first printed circuit board controls the disk motor and the optical head of the drive mechanism, the first printed circuit board receiving signals from the optical head and/or sending signals to the optical head to perform the reproducing of information and/or the recording of information. The disk device further comprises a second printed circuit board electrically coupling the drive mechanism to the first printed circuit board, the second printed circuit board including a connector coupled to wire patterns of the signals received and/or sent by the first printed circuit board, and the connector being coupled to the first printed circuit board.

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: First and second input signals are supplied to the bases of first and second input transistors, respectively, and the first and second input transistors output currents in accordance with the first and second input signals, respectively. A resistor provided between the emitter of the first input transistor and the emitter of the second input. transistor generates the differential voltage of the first input signal and the second input signal. First and second constant-current sources supply currents to the collectors of the first and second input transistors, respectively. The collectors of first and second control transistors are connected to the emitters of the first and second input transistors, respectively, and the base voltages of the first and second control transistors are controlled in accordance with the emitter currents of the first and second input transistors, respectively.

Abstract: In a magnetic head for writing/reading a magnetic disk comprising sliders (15, 16) having sliding surfaces which are brought into contact with a surface of the magnetic disk so as to slide relatively to the magnetic disk and a spacer (20) for adjusting height of the sliders (15, 16), each of the sliders (15, 16) is formed from a nonmagnetic material consisting of calcium titanate, and the spacer (20) is formed from a ferrite-group magnetic material, the ferrite-group magnetic material being selected to have substantially the same coefficient of thermal expansion as that of the nonmagnetic material.

Abstract: A magnetic head apparatus has a reduced thickness by preventing a jumping action of a magnetic head that can occur in a head-up state. A leaf spring has a first end and a second end opposite to the first end, and the leaf spring supporting the magnetic head at the first end, the leaf spring having a surface facing the magnetic medium. A mount member holds the leaf spring, the leaf spring being mounted to the mount member at the second end. A supporting portion extends from the mount member, and engages the surface of the leaf spring at a position between the magnetic head and the mount member.

Abstract: A mount which is fixed to a retaining board is provided with a mounting surface on which a mechanism component consisting of a link mechanism and a solenoid is mounted; a first support leg having a vertical portion downwardly folded along one edge of the mounting surface and a horizontal attachment portion which is horizontally folded along the lower end of the vertical portion and is fixed to the retaining board with a screw; and a second support leg having a vertical portion downwardly folded along the other edge of the mounting surface and a holding edge which partially extends from a lower edge of the vertical portion and is horizontally folded.

Abstract: A cassette lid opening/closing mechanism of a cassette tape driver for a cassette and the like cassettes, which is simply constructed at a reduced price. Holes are formed in the lid opening/closing levers and are pivoted to the support shafts on the side plates of the cassette holder. Hooks at the ends of the lid opening/closing levers are folded inwardly of the cassette holder and then forwardly. The side plates of the cassette holder extend backwardly to enter into the hooks. When the cassette tape is inserted in the cassette holder so that the cassette holder is slid back, the lid opening/closing levers turn and the hooks depress the lid of the cassette tape from the lower side so that the lid is open. The side plates limit the play of the lid opening/closing levers in the right-and-left direction. Therefore, the lid opening/closing levers are pivotally attached without requiring highly precisely machined shafts or bearings.

Abstract: A navigation system comprises: an antenna 12 which receives radio waves from a GPS satellite; a controller 15 which perform various operations to detect the present position of the car from the output signal of the antenna 12; and an image display 17 which, being controlled by the controller, displays a map, the present position of the car, etc., and a traveling-direction indicator 30 which includes a sign section made up of arrow marks or triangular marks to indicate a direction in which the car should move on. With the system, as the car comes near a branching guide point such as a crossing, the controller 15 operates to cause the sign section of the traveling-section indicator 30 to turn on or flicker to indicate a direction in which the car should move one.

Abstract: A car navigation system with an FM multi-broadcast signal receiving function has: a function of displaying a current position on a display 17a according to position data which is received through a GPS antenna 12 from a satellite; and an FM multi-data display unit 17 which is arranged on a dash board 31 in front of the driver's seat of a vehicle.

Abstract: In a cell balance circuit including a cell group in which two or more rechargeable cells are connected in series, a voltage converting circuit converts the voltages of the respective cells in the cell group into GND voltage standards on the basis of a ground voltage and produces two or more converted voltages. An output circuit determines a lowest voltage of the two or more converted voltages and produces the lowest voltage. Discharge circuits are provided for the respective cells for forming discharge loops to discharge the corresponding cells. Discharge control circuits are provided for the respective discharge circuits. Each discharge control circuit determines a difference between the converted voltage of the corresponding cell and the lowest voltage to control the discharge circuit to form the discharge loop when the difference exceeds a predetermined value.

Abstract: A temperature-compensated quartz oscillator comprises a stabilized power supply circuit (1) for supplying a constant voltage, an oscillation circuit (2) comprising a quartz resonator (21) and a varicap (22), a temperature detecting circuit (3) for producing a detected voltage signal (V.sub.Temp) corresponding to an oscillator part temperature by the use of the temperature-voltage characteristic of a temperature detecting element located in the vicinity of the oscillation circuit (2), and a temperature characteristic compensating portion (4) for producing through analog processing of the detected voltage signal (V.sub.Temp) a varicap control voltage signal (V.sub.VR) to be supplied to the varicap (22).

Abstract: Adjusting elements (R1, R2 and R3) are redundantly or preliminarily built in an IC circuit body (5), the adjusting elements (R1, R2 and R3) are connected to one another through conductor patterns (P1, P2 and P3) provided outside the circuit body (5), and after the circuit operating function is confirmed by inspection, the conductor patterns (P1, P2 and P3) are selectively cut to select an adjusting element to be used, thereby to adjust or select a function of the circuit body.