Abstract: In a signal determining apparatus including an amplifier circuit adapted to receive and amplify an input signal to generate an output voltage, and a comparator adapted to compare the output voltage of the amplifier circuit with a reference voltage to generate an output signal, the amplifier circuit has variable response speed characteristics so that a response speed of the amplifier circuit is controlled during its amplifying operation.

Abstract: A disk drive comprising a rotor, to which a disk and a plurality of magnets are fixed, and an open-slot type integrally molded stator disposed about an outer periphery of the magnets, and wherein the stator comprises coils formed by etching metallic films on teeth. The invention may also be applied to a closed-slot type stator. With either type, it is possible to produce an opening that is equal to or smaller than the thickness of a coil wire and cogging torque is minimized.

Abstract: An object of the invention is to inhibit a turning force of a magnetic disc apparatus from being reduced. In order to achieve the object, there is provided a magnetic disc apparatus having a rotor to which a magnetic disc fixed, and a stator which is filled with a resin between stator coils, wherein a member having a lower expansion coefficient than a thermal expansion coefficient of the resin is arranged between the stator coils.

Abstract: A lens driving device includes a moving body equipped with a lens and a driving magnet attached to the lens, and a fixed body that is equipped with a driving coil that forms together with the driving magnet a magnetic circuit and moves the moving body in an optical axis direction of the lens between a first lens retaining position and a second lens retaining position, and at least one magnetic member disposed adjacent to at least one of two end sections in the optical axis direction of the driving magnet. The moving body is retained at the first lens retaining position by magnetic attraction caused by the driving magnet and the magnetic member when energization of the driving coil is stopped. Accordingly, the driving coil does not need to be energized while the lens is retained at the first lens retaining position.

Abstract: In a photocurrent-to-voltage conversion apparatus for converting a photocurrent flowing through a light receiving element into a detection voltage, an amplifier, a feedback resistor and a clamping MOS transistor are provided. The amplifier has an input connected to the light receiving element and an output for generating the detection voltage, and includes (2n+1) inverter stages connected in series where n is 1, 2 . . . . The feedback resistor and the clamping transistor are connected between the output and input of the amplifier. The clamping MOS transistor is controlled by an output voltage of a non-final inverter one of the inverter stages.

Abstract: The present invention provides a method of shaping notches for use in lens manufacturing including providing a material to be milled to form a curved surface having many concentric notches utilizing a bite. The flat type bite has rakes with a curvature radius of at most 0.1 ?m at both ends of the flat cutting edge. The relative rotation of the bite and the material allows the flat type bite to mill the material in a desired shape as the cutting edge of the flat type bite is pressed against the material. The lens is milled by the flat portion along the cutting edge of the flat type bite in such a manner that the curved surface maintains an approximately linear shape and the notches are milled by the rakes on the cutting edge of the flat type bite. The present invention also provides a metallic mold for molding lens using the method of shaping notches, a method of manufacturing a lens and a lens having a surface with a curvature that has many concentric notches.

Abstract: A common objective lens typically used in reading data from different optical data storage media that are responsive to laser beams of different wavelengths, such as CD and DVD is provided. The lens has a refracting surface with inner and outer refracting surface regions. Diffraction gratings are provided in both the inner and outer refracting surface regions with each having a differential optical path function. The inner diffraction grating and at least a part of the outer diffraction grating emit an order of diffracted beams which have different polarities to cancel out any spherical aberrations caused by a change in temperature.

Abstract: A lens driving apparatus includes a lens holder and a driver for providing linear motion to the lens holder along an optical axis of the lens. The driver includes an electromagnetic mechanism, provided at the outer circumference of the lens holder in an enclosing manner, for generating a torque around the optical axis; and a switching mechanism for switching the generated torque to a linear driving force along the optical axis so as to linearly move the lens holders. The driver surrounds the lens holder along the outer circumference to allow a smaller sized lens driving apparatus than that where the lens holder is at a side of the lens driving apparatus. In addition, the switching mechanism prevents the lens holder from moving in the optical axial direction, when power is turned off or even when an external force is applied to the lens holder.

Abstract: An electronic equipment is capable of improving falling down shock resistance or impact resistance in an electronic equipment and of improving reliability of a solder joint in a semiconductor device die-bonded Si chip or the like to which thermal shock causing large deformation may act, bump mounting of BGA, CSP, WPP, flip-chip and so forth, a power module acting large stress and so forth. The electronic equipment has a circuit board and an electronic parts to be electrically connected to an electrode of the circuit board. The electrode of the circuit board and an electrode of the electronic part are connected by soldering using a lead free solder consisted of Cu: 0-2.0 mass %, In: 0.1-10 mass %, and Sn: remaining amount.

Abstract: A lens driving device includes a moving body equipped with a lens and a driving magnet attached to the lens, and a fixed body that is equipped with a driving coil that forms together with the driving magnet a magnetic circuit and moves the moving body in an optical axis direction of the lens between a first lens retaining position and a second lens retaining position, and at least one magnetic member disposed adjacent to at least one of two end sections in the optical axis direction of the driving magnet. The moving body is retained at the first lens retaining position by magnetic attraction caused by the driving magnet and the magnetic member when energization of the driving coil is stopped. Accordingly, the driving coil does not need to be energized while the lens is retained at the first lens retaining position.

Abstract: An optical head device includes a first laser light source that emits a first laser beam with a first wavelength, a second laser light source that emits a second laser beam with a second wavelength which is different from that of the first laser beam, a common objective lens that converges the first laser beam on a recording surface of a first optical recording medium and the second laser beam on a recording surface of a second optical recording medium, a refraction surface that is formed on the common objective lens so as to be divided into a center side refraction surface region around an optical axis of the common objective lens and an outer peripheral side refraction surface region surrounding the center side refraction surface region and a center side diffraction grating that is formed all over the center side refraction surface region and is provided with a number of minute steps in a concentrically circular shape.

Abstract: The present invention provides a resin composition high in melting flow, exhibiting good properties, excellent in moldability and shrinkage properties, and hence suitable for automobile exteriors, by including (A) propylene/ethylene block copolymer having a melt flow rate (MFR) of 100 to 200 g/10 min., its propylene homopolymer component having an MFR of 210 to 400 g/10 min. and isotactic pentad fraction of 0.98 or more, and its copolymer portion containing propylene at 65 to 85% by weight; 50 to 70% by weight, (B) ethylene/octene and/or ethylene/butene random copolymer; 10 to 25% by weight, (C) styrene-based hydrogenated block copolymer rubber; 4 to 9% by weight and (D) talc; 16 to 24% by weight.

Abstract: A disk drive comprising a rotor, to which a disk and a plurality of magnets are fixed, and an open-slot type integrally molded stator disposed about an outer periphery of the magnets, and wherein the stator comprises coils formed by etching metallic films on teeth. The invention may also be applied to a closed-slot type stator. With either type, it is possible to produce an opening that is equal to or smaller than the thickness of a coil wire and cogging torque is minimized.

Abstract: An object of the invention is to inhibit a turning force of a magnetic disc apparatus from being reduced. In order to achieve the object, there is provided a magnetic disc apparatus having a rotor to which a magnetic disc fixed, and a stator which is filled with a resin between stator coils, wherein a member having a lower expansion coefficient than a thermal expansion coefficient of the resin is arranged between the stator coils.

Abstract: A magnetic disk drive includes a base constituting at least a face included in an enclosure; a shaft secured to the base; a rotor which rotates around the shaft as a rotary axis; a stator for rotating the rotor; and a magnetic disk secured to the rotor; wherein the stator is disposed on a face facing the base. This improves durability of the magnetic disk drive.

Abstract: An electronic device, in which terminals of a semiconductor integrated circuit chip and terminals of a circuit substrate are mounted with solder so as to face one another. The electronic device includes a first resin, which is disposed between the circuit substrate and a terminal formation face of the semiconductor integrated circuit chip and a second resin, which is disposed at the outer perimeter of the semiconductor integrated circuit chip or is disposed laterally thereon. The modulus of elasticity of the second resin is smaller than the modulus of elasticity of the first resin, the modulus of elasticity of the second resin is at least 0.5 GPa but not more than 28 GPa at room temperature.

Abstract: A technique of connection between VCM system wires and a FPC of a disk drive is improved in the following manner to enable miniaturization and thinning of the disk drive and reduction in cost. There is provided a disk drive comprising a disk-shaped medium for recording information, an actuator on which a head for recording/reproducing information is mounted, a VCM for driving the actuator, a coil holder supporting a coil of the VCM, a FPC for transmitting a signal, which is read by the head, and a signal to the VCM, a cut groove formed on a side of the coil holder, ends of coil lead wires and an end of a ground wire, which are arranged in the cut groove, and an end of the FPC inserted into the cut groove to thereby be connected to the ends of the coil lead wires and the end of ground wire.

Abstract: An electronic equipment is capable of improving falling down shock resistance or impact resistance in an electronic equipment and of improving reliability of a solder joint in a semiconductor device die-bonded Si chip or the like to which thermal shock causing large deformation may act, bump mounting of BGA, CSP, WPP, flip-chip and so forth, a power module acting large stress and so forth. The electronic equipment has a circuit board and an electronic parts to be electrically connected to an electrode of the circuit board. The electrode of the circuit board and an electrode of the electronic part are connected by soldering using a lead free solder consisted of Cu: 0-2.0 mass %, In: 0.1-10 mass %, and Sn: remaining amount.

Abstract: The present invention a structure in which a semiconductor integrated circuit chip can be easily removed and the reliability of flip-chip bonding is assured, a method of packaging electronic parts, and method and apparatus for detaching electronic parts. According to the invention, the object is achieved by a flip-chip bonding structure using two kinds of soluble and insoluble resins for bonding a semiconductor integrated circuit chip and a circuit board.

Abstract: An optical head device that converges first and second laser beams having different wavelengths on recording surfaces of first and second optical recording media through a single light converging optical system including an objective lens for recording or reproducing data on the recording surfaces. A refracting surface of the objective lens is divided into two regions, i.e., a central refracting surface region with an optical axis thereof being as a center and an outer circumferential refracting surface region that surrounds an outer circumference of the central refracting surface region. A diffraction grating is formed generally entirely over the central refracting surface region. When recording or reproducing data on the first optical recording medium using the first laser beam, a beam spot is formed with a diffracted beam obtained by the central refracting surface region.