Abstract: Of the two coil units 2-1 and 2-2 constituting an upper-stage coil unit, the coil unit 2-1 is passed through the winding of a coil unit 1-2 that constitutes a lower-stage coil unit, together with a coil unit 1-1, from inside to outside of the winding. A wire led inwards from the coil unit 2-1 of the upper-stage coil unit is passed through the inside of the winding of the coil unit 1-1 of the lower-stage coil unit, and is pulled outside the winding of the coil unit 1-1.

Abstract: An optical disk device of the present invention has a main PC board carrying a semiconductor element and attached at the rear of a drawer to efficiently dissipate a heat generated from the semiconductor element. The drawer is formed of a material having good thermal conductivity. A thermal conductive member having good thermal conductivity is interposed between the IC desired to be dissipate heat and the drawer.

Abstract: An optical disk drive is provided with an optical pickup and an optical sensor. The optical pickup is used for reading main information from an optical disk. The optical sensor is located in the range of R17 to R23 and used for reading sub information from the optical disk. The optical sensor is provided in relation to the center of a spindle motor used for rotating the optical disk and is located within 120° with respect to the radius that is 180° opposite to the radius along which the optical pickup is movable.

Abstract: A skew adjustment mechanism of an optical disk drive includes: a pair of rod-shaped guide shafts 32a and 32b that hold an optical pick-up unit 31 therebetween and guide the optical pick-up unit; four fixing members each having a pair of claw portions 44b1 and 44b2 that are provided at a predetermined interval; four extension springs 37a, 37b, 37c and 37d each having ring-shaped hook portions at both leading ends thereof, the hook portions are hooked over the claw portions where the extension spring surrounds the shaft, thereby pressing the end portions of the shaft against the fixing member; four adjustment mechanisms that move the guide shafts 32a and 32b against the fixing member so as to allow the end portion of the guide shafts to be away from the fixing member in order to tilt the optical pick-up unit 31 in accordance with the tilt of the optical disk.

Abstract: An optical disk device of the present invention has a main PC board carrying a semiconductor element and attached at the rear of a drawer to efficiently dissipate a heat generated from the semiconductor element. The drawer is formed of a material having good thermal conductivity. A thermal conductive member having good thermal conductivity is interposed between the IC desired to be dissipate heat and the drawer.

Abstract: There is disclosed an optical pickup device having semiconductor laser light sources for first, second, and third wavelengths different from each other. After optical paths of laser beams outgoing from the first and second semiconductor laser light sources are synthesized by a first prism, an optical path of a laser beam outgoing from the third semiconductor laser light source is synthesized, through a magnification change lens, to raise light efficiency. At this time, each of the laser beams is synthesized by a second prism.

Abstract: The substrate of a housing that holds a prism optical component has almost hemispherical recesses at positions that correspond to the four corners of the prism optical component. An adhesive that is fast dried is applied into the hemispherical recesses. To the back of the prism optical component, an adhesive that is cured with time or a thermosetting adhesive is applied, forming a thin layer having uniform thickness.

Abstract: An optical disk device includes a format determination unit which determines a format causing an intersymbol interference ratio of not less than a preset value, as a format for power calibration performed on an optical disk, when an intersymbol interference ratio of data to be recorded on the optical disk is lower than a preset value, a power calibration unit which executes power calibration on the optical disk using the format determined by the format determination unit, an optimal power determination unit which determines optimal power for a laser beam used to record the data, based on a result of the power calibration by the power calibration unit, and a recording unit which records the data on the optical disk using a laser beam corresponding to the optimal power determined by the optimal power determination unit.

Abstract: A guide portion provided in parallel with a main shaft is formed integrally with a resin-made mechanism chassis. A slidable member is provided between a guide receiver portion of a pickup and the guide portion. The guide receiver portion is provided with a spring member which applies an energizing force to press the slidable member and the guide portion.

Abstract: An optical pickup apparatus comprises an lens assembly including an object lens arranged for either a first optical disk (BD) or a second optical disk (HD-DVD) different from the first optical disk in terms of substrate thickness and a liquid crystal lens and is adapted to irradiate a light beam with a numerical aperture of 0.85, turning off the liquid crystal lens, when recording signals on/reproducing signals from a BD and a light beam with a numerical aperture of 0.65, turning on the liquid crystal lens, when recording signals on/reproducing signals from an HD-DVD.

Abstract: According to an optical disk device of the present invention, in the drive operation, when a detection circuit detects an electric wave coming from an outside radio equipment, and a comparison circuit detects that the voltage of the electric wave is equal to or over a predetermined threshold level, in case it is determined that data is being reproduced from or data is being recorded to a record type medium, a CPU controls a laser drive circuit to temporarily turn off the output of laser from an optical PUH. On the other hand, in case it is determined that data is being reproduced from a read type medium, the CPU controls the laser drive circuit to enhance the power of laser of the optical PUH to improve the S/N ratio.

Abstract: An optical disk apparatus includes: a focus error signal generation unit which generates a focus error signal for detecting a focal point of a beam spot based on a signal that has been read out from an optical disk through an optical pickup; a focus gain detection unit which detects the loop gain of a focus servo loop based on the focus error signal output from the focus error signal generation unit; and a drive unit which drives a focus actuator for moving the optical pickup in the focusing direction by a drive signal that has been gain adjusted depending on the loop gain detected by the focus gain detection unit.

Abstract: An optical disc device includes a conductive member of a bezel assembly with openings formed by a plurality of parting lines, and gaskets are attached to the upper and lower sides of the conductive member using conductive adhesion bond.

Abstract: An exemplary optical pick-up apparatus of the invention includes: a first light source configured to emit a light beam of a first wavelength; a second light source configured to emit a light beam of a second wavelength, the second wavelength longer than the first wavelength; a third light source configured to emit a light beam of a third wavelength, the third wavelength longer than the second wavelength, wherein the first, second, and third light sources emit light beams one at a time during a reading or writing operation; a first dichroic element configured to transmit the light beam of the first wavelength and to reflect the light beam of the second wavelength; a second dichroic element configured to reflect the light beams of the first and second wavelengths and to transmit the light beam of the third wavelength; and an objective lens configured to transmit light beams of the first and second wavelengths, that have interacted with the first and second dichroic elements, to transmit the third wavelength, th

Abstract: An optical head includes a first laser diode configured to generate a laser beam with a wave length of ?1, a second laser diode configured to generate a laser beam with a shorter wave length of ?2 than the wave length ?1, a collimator lens arranged so that the laser beams are incident on it, an aperture filter arranged on an optical axis of the collimator lens, and an object lens 0 arranged on the optical axis so that the laser beams passing through the aperture filter are incident on it, wherein the second laser diode is arranged at a position on the optical axis further away from collimator lens than the first laser diode is away from the collimator lens.

Abstract: An optical disk device of the present invention has a main PC board carrying a semiconductor element and attached at the rear of a drawer to efficiently dissipate a heat generated from the semiconductor element. The drawer is formed of a material having good thermal conductivity. A thermal conductive member having good thermal conductivity is interposed between the IC desired to be dissipate heat and the drawer.

Abstract: An optical pick-up apparatus that irradiates a disk with laser light emitted from a laser light source and uses a photodetector to receive the laser light reflected by the disk to thereby perform recording/reproduction onto/from the disk, comprises: a laser diode driver that drives the laser light source; an upper cover that serves as a heat radiation means for radiating heat generated by the laser diode driver; and an optical base that serves as a heat radiation means for radiating heat generated by the laser light source and photodetector.

Abstract: An exemplary optical pick-up apparatus of the invention comprises: an optical base; a collimator lens provided on the optical base; a laser source disposed adjacent the collimator lens on the optical base and emitting light that produces heat; and temperature gradient control means, provided between the collimator lens and the laser source on the optical base, for flattening temperature gradient between the collimator lens and its surroundings.

Abstract: A skew adjustment mechanism of an optical disk drive includes: an optical pick-up unit 31 that irradiates an optical disk with a laser light and receives the laser light reflected by the optical disk; a pair of rod-shaped guide shafts 32a and 32b that hold the optical pick-up unit 31 therebetween and guide the optical pick-up unit 31 in the extending direction of the guide shafts 32a and 32b; four fixing members disposed at respective end portions of the guide shafts 32a and 32b and each having a pair of claw portions 44b1 and 44b2 that are provided at a predetermined interval; four extension springs 37a, 37b, 37c and 37d each having ring-shaped hook portions at both leading ends thereof, the hook portions are hooked over the claw portions in a state where the extension spring surrounds the shaft, thereby pressing the end portions of the shaft against the fixing member; and four adjustment mechanisms that move the guide shafts 32a and 32b against the fixing member so as to allow the end portion of the guide s