Abstract: A connector mold (4) of a connector socket (1) includes pairs of contact holding chambers (7U,7L) facing each other along a direction perpendicular to a length of the connector socket. Contact insertion openings in opposite sides of the pairs of contact holding chambers permit the insertion of contacts (8U,8L) from opposed sides into the contact holding chambers. The opposite-side installations of the contacts permits pre-installation final forming of the contacts, including an "L"-shaped external connection terminal (8b) for external connection of the connector to a circuit board before the contacts are inserted into the mold. Base attachment grooves (10U,10L) in the inner walls of the contact holding chambers guide the insertion of the contacts into their respective contact holding chambers, and fix the contacts in place after insertion. A shield plate (9) is used to prevent electrostatic fingertip charge from reaching the contacts.

Abstract: A switching regulator includes an oscillation circuit for generating a triangular waveform signal having a predetermined frequency, a comparator compares the triangular waveform signal generated by the oscillation circuit with a voltage control signal commensurate with a voltage to be output so as to generate a pulse signal which goes high or low depending on a result of the comparison, and a driving circuit for selecting a portion of the triangular waveform signal generated by the oscillation responsive to the pulse signal generated by the comparator, so as to generate the drive signal for driving the switching element.

Abstract: A air-core coil forming system which comprises a sheath peeling section and a coil forming section. The sheath peeling section includes a rotatable cylindrical cutting head having a through hole provided at radial center portion thereof into which the sheathed wire is inserted, a blade portion for peeling the sheath of the sheathed wire, and a blade support member for supporting in a manner that the blade is brought into contact with the sheath by means of a centrifugal force produced when the cutting head is rotated, a motor directly connected with the cutting head for rotating the same, and a rotary shaft provided in the motor such that a central axis thereof coincides with the through hole of the cutting head and having hollowed structure into which the sheathed wire is inserted.

Abstract: A GPS antenna cover comprises a box-like cover body formed by a top wall and four side walls, the cover body having an opened bottom, a GPS antenna receiving chamber defined by four inner walls extending perpendicularly from an inner face of the top wall toward the bottom, and a first holding member formed on and projecting inwardly from inner faces of the inner side walls for holding a GPS antenna unit from the side of the bottom, the GPS antenna unit inserted into the antenna receiving chamber through the bottom. The antenna receiving chamber includes a second holding member formed on and project inwardly from the inner face of the top wall for abutting against an upper face of the GPS antenna unit and urging the GPS antenna unit from the side of the top wall.

Abstract: A connector socket has a metallic latch member that is inserted from the rear through a latch attachment opening to position an engagement section in a plug insertion opening where it can be engaged by a lock claw of a plug inserted into a plug insertion opening in the front surface of the connector socket. The metallic engagement section resists wear from repeated plugging and unplugging of a connector plug in the connector plug opening. The latch member has transversely extending fixed support pieces integrally formed with the engagement section, which fit through guide grooves in the latch attachment opening. Reverse engagement claws extending laterally from the outer ends of the fixed support pieces dig into, and permanently retain the latch member in place. The ability to easily insert the latch member through the rear surface of the connector socket reduces assembly cost, and permits a connector socket to have any desired number of plug insertion openings in its face.

Abstract: A carriage location detector comprises a scale formed on a carriage and having a plurality of slits at a predetermined interval, a photointerrupter including at least one light emitting element and a plurality of light receiving elements arranged opposite to each other with the scale interposed therebetween. The light receiving elements are so that output signals thereof have a phase difference of 90.degree. from one another. A processing circuit is responsive to the output signals from the light emitting elements for carrying out processing, in an initial setting operation, so as to keep voltage waveforms of the output signals within a predetermined range.

Abstract: A disk table in a magnetic disk drive is disclosed. The disk table comprises a disk table body having an opening, a chucking arm made of an elastic body, where one end of the chucking arm is fixed on a lower face of the disk table body and the other end of the chucking arm is set free, a chucking roller disposed on the other fee end of the chucking arm, where the chucking roller is protruded from an upper face of the disk table through the opening, and a stopper provided on the lower face of the disk table in the vicinity of the free end of the chucking arm, wherein the chucking arm is freely floatable in vertical direction, and the amount of separation of the free end of the chucking arm from the lower face of the disk table body is restricted by stopper when the chucking roller is urged downwards.

Abstract: A disk drive comprises a frame plate having a principal surface on which a receiving portion for receiving a disk and a recording/reproducing unit for carrying out recording/reproducing operations onto and from the disk are provided. The frame plate comprises a metal thin plate and has a rear surface to which a thin reinforcing plate substantially equal in length and width to the frame plate is adhered.

Abstract: A battery charge control circuit has a first transistor and a second transistor. The first transistor is cut off when an output terminal voltage is lower than a line terminal voltage and closes when it is not. The second transistor closes when the first terminal is cut off so as to supply an actuating current to a circuit generating a constant voltage. The closing of the second transistor causes an output transistor current to be variably adjusted and a battery connected to the output terminal to be charged using only the first and second transistors. This simple circuit structure makes it possible to reduce the number of elements and thus the size of the battery charge control circuit and to prevent improper operation.

Abstract: A method of producing a flexible board includes printing a circuit pattern on a base film, and providing a plating onto a surface of the circuit pattern.

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: A magnetic disk drive DD motor 20 including: a printed board 22 that is mounted on an upper surface of a frame 21 of a magnetic disk drive and that has a coil formed on a surface thereof; a spindle shaft 23 that is inserted into a through hole 22a formed in the frame and the printed board and that is supported so as to be vertical and rotatable with respect to the frame; a rotor that is constructed of a rotor case 24a mounted on the spindle shaft so as to confront the coil on the printed board and of a ringlike rotor magnet 24b mounted inside the rotor case; and a disklike disk table 25 that is fixed to the spindle shaft on an upper side of the frame and that supports a magnetic disk.

Abstract: A method of writing servo data onto a high density flexible magnetic disk (7) using a servo writer is disclosed. This method comprises the steps of providing surface rippling prevention means on both sides of the magnetic disk, respectively; rotating the flexible magnetic disk at a rotation speed of 2000 rpm or higher with a spindle motor (3); and writing the servo data onto the flexible magnetic disk with magnetic heads (4). The surface rippling prevention means include soft sheet members (8a, 8b) which are arranged in close proximity to both surfaces of the flexible disk (7) in order to prevent surface rippling of the flexible disk (7) from being caused, thereby improving the accuracy of writing servo data.

Abstract: In a position detection unit having a scale and a photointerrupter and using in a magnetic disk drive, the scale has a plurality of slits which are equally spaced along a direction in parallel with a predetermined radial direction and a clipped section which is clipped out of the scale. The photointerrupter has a first light-emitting section and a first light-receiving section which are opposed to each other with the slits put therebetween. The photointerrupter has a second light-emitting section and a second light-receiving section which are opposed to each other at a position corresponding to the clipped section. The scale is mounted on a carriage at a side opposed to a main surface of a main frame. The carriage supports a magnetic head of the magnetic disk drive. And the photointerrupter is mounted on a substrate located close to the main frame.

Abstract: A computer system comprises a computer main body including a main board on which various components such as a CPU and the like are mounted and a hard disc unit; a read-only optical disc drive provided in the computer main body; a write-only optical disc drive which is constructed separately from the read-only optical disc drive, the write-only optical disc drive being provided in the computer main body; and a bus for connecting the main board, the hard disc unit, the read-only optical disc drive, and the write-only disc drive with each other, in which the hard disc unit, the write-only optical disc drive and the read-only optical disc drive are connected by means of a cascade connection.

Abstract: An output from a left half light-receiving portion C1, C4 of a main-beam photodiode 5 of an optical pickup and an output from a right half light-receiving portion C2, C3 of a main-beam photodiode 5 of an optical pickup are normalized, and the difference between the normalized outputs is calculated.(C1+C4)/.alpha.*(C1+C4)-(C2+C3)/.alpha.*(C2+C3)in which .alpha. is a constant.Accordingly, even in the case where the objective lens 1 is shifted to the inside or outside of a track, a wobble signal can be extracted securely because the DC offset components of the difference signals in the on-track main laser beam MB are cancelled out.

Abstract: A disc drive is provided with an optical pick-up for reading data recorded in a program area of an optical disc; and a photo-interrupter for optically reading out bar information of a bar code which is arranged in an arc shape within at least a part of an annular bar code area provided on the optical disc between the program area and a clamping area of the optical disk so as to be readable from either side of the top and underside surfaces of the optical disk, wherein the photo-interrupter is located on the opposite side of the optical disc relative to the optical pick-up when the optical disc is loaded in the disc drive to read the information of the bar code from that position. Preferably, the photo-interrupter is provided on a clamper support which is provided for supporting a disc clamper for holding the optical disc between the disc clamper and a turntable for rotating the optical disc. This arrangement makes it easy to provide the photo-interrupter for reading the bar code.