Abstract: An optical semiconductor device is provided that includes an emitted beam dividing portion (61) for dividing an emitted light beam from the laser element (51), a reflected beam dividing portion (71) for dividing a reflected light beam from an information recording medium (3) into light beams in different focused states, servo-signal-detecting photodetector elements (43, 45) for receiving the reflected light beams obtained by the division by the reflected beam dividing portion in a defocused state, a first diffraction grating that is provided in the emitted beam dividing portion and that diffracts the reflected light beam having passed through the reflected beam dividing portion, and a signal-detecting photodetector element (47) for receiving reflected light beams having been subjected to the diffraction by the first diffraction grating.

Abstract: A movable enclosure contains optical components, such as an objective lens, a semiconductor laser, a mirror, and a photodetector. The movable enclosure is supported by a fixed member via a plurality of wires that are positioned in parallel. This construction allows the movable enclosure to move in a tracking direction and a focusing direction. The plurality of wires are insulated from one another to be also used as power-supplying lines and signal lines for the semiconductor laser and the photodetector.

Abstract: An optoelectronic apparatus includes an optoelectronic device, a mounting portion, a frame member surrounding a periphery of the mounting portion, and an optical component. The optical component is placed on an optical component placement portion. The frame member includes a pair of first side walls and a pair of second side walls. Each of the pair of second side walls has a recessed portion and a protruded portion. The optical component is disposed between the protruded portions, and is fixed with an adhesive filled in the recessed portions.

Abstract: In order to provide a piezoelectric transformer-driving circuit capable of obtaining a drive pulse signal having a high frequency resolution from a clock having a low frequency, carrying out voltage detection by using a low-cost configuration, and carrying out digital processing, a piezoelectric transformer-driving circuit in accordance with the present invention is configured so that an error voltage calculation circuit multiplies the difference data between the output data of an A/D converter and reference data supplied externally by a constant and outputs the result as error data, so that a frequency setting circuit sets the frequency of the drive pulse signal of the piezoelectric transformer as M-bit data depending on the error data, and so that a frequency division ratio distribution divider circuit divides a clock having a predetermined frequency to generate the drive pulse signal of the piezoelectric transformer, wherein the frequency division ratio of the frequency division ratio distribution divider

Abstract: A semiconductor laser element has the following configuration: a dual-wavelength monolithic laser where semiconductor lasers with emission wavelengths of 650 nm and 780 nm are integrated on one chip is soldered on a heat sink which then is soldered on a can package. Two beam emission points of the semiconductor laser element are positioned so that beam spots, formed on an optical disk, of light beams emitted from the two semiconductor lasers are aligned substantially along a pit-row direction in the optical disk. Thus, an optical head device and an optical recording and reproducing apparatus can be obtained that can record information on or reproduce recorded information from optical information recording media with different optical characteristics and recording densities from one another and that do not cause instability in tracking servo operation.

Abstract: Either an inner ring or an outer ring is formed to protrude in the direction of the rotation axis more than the other of outer ring or inner ring. For example, the bearing 12 is supported by the bearing housing 11a on the outer peripheral face 12b of the outer ring, and rotatably supports the hub 31a on the inner peripheral face 12a of the inner ring. In this bearing 12, the inner ring is formed to be longer and protrude further than the outer ring in the direction of the rotation axis, and an engagement/support face 12c for enagageably supporting the drive sprocket 92 is formed on the outer periphery of the inner ring formed to protrude as described above. The drive sprocket 92 is able to secure the coaxiality thereof by the engagement with the engagement/support face 12c, and receive the transmittance of rotating torque by engaging with the hub-side spline 31c on the spline 92c.

Abstract: A lens holding member carrying an objective lens is movable and supported by a fixed member via a plurality of supporting members. Each supporting member includes a bent part in its base portion on the side of the fixed member. The bent part is bent in a first direction (focusing direction) and a second direction (tracking direction) that are perpendicular to each another. Each supporting member is shaped so as to make all the principal planes of the supporting member parallel to the second direction. The fixed member includes a concave, which is impregnated with a gel material so that the bent part is covered with the gel material.

Abstract: In a lens driving device for an optical recording/reproducing apparatus, a lens is held by a platelike damping member that is made of silicone porous material, for example, and both ends of the damping member are fixed to a base. This construction prevents undesired oscillations. Also, in order to drive the lens, two magnets are attached to an outer edge of the lens opposite to each other with the lens interposed in between them, and driving coils are attached to the base facing the magnets. The driving coils have two coils that drive the lens in the tracking and focusing directions, respectively.

Abstract: An optical pickup is equipped with: an enclosure which contains an optical system including a semiconductor laser and an objective lens; a fixed member; and an elastic supporting member which has conductivity and movably supports the enclosure. A plurality of pairs of driving coils are each positioned in the enclosure so as to be symmetrical with respect to an optical axis of a laser beam. The plurality of pairs of driving coils generate magnetic forces with a plurality of magnets or the like, to drive the enclosure in a focusing direction and a tracking direction.

Abstract: A semiconductor laser device of the present invention includes: a semiconductor laser chip including an anode and a cathode; and a field effect transistor. The anode of the semiconductor laser chip is connected to the drain of the field effect transistor. The gate of the field effect transistor is connected to the drain of the field effect transistor. And the cathode of the semiconductor laser chip is connected to the source of the field effect transistor.

Abstract: A semiconductor laser device is provided which can carry out recording and reproduction with respect to optical disks with different formats. In this semiconductor laser device, a receiving/emitting optics integrated substrate, in which two semiconductor laser elements with different emission wavelengths and a plurality of receiving optics are integrated, is disposed in a case and is sealed with a hologram element. A composite prism is placed on the hologram element. The distances, when measured in air, from the two semiconductor laser elements to a focusing means, for example, a collimator lens are set to be substantially equal. Thus, a small and inexpensive semiconductor laser device can be obtained. In addition, a single collimator lens can be employed, and thus the optical configuration is facilitated.

Abstract: An optoelectronic apparatus includes an optoelectronic device, a mounting portion, a frame member surrounding a periphery of the mounting portion, and an optical component. The optical component is placed on an optical component placement portion. The frame member includes a pair of first side walls and a pair of second side walls. Each of the pair of second side walls has a recessed portion and a protruded portion. The optical component is disposed between the protruded portions, and is fixed with an adhesive filled in the recessed portions.

Abstract: A semiconductor laser device includes a semiconductor laser element for emitting laser light onto a recording medium; beam dividing element provided in an optical path between the semiconductor laser element and the recording medium; a hologram optical element including a diffraction grating formed in a light-transmitting substrate, the hologram optical element located in an optical path between the beam dividing element and the semiconductor laser element; a servo-signal light-receiving element provided in an optical path of diffracted light transmitted through the diffraction grating for receiving the diffracted light; an information-signal light-receiving element for receiving light divided by the beam-dividing element, which is different from light divided by the beam-dividing element which is received by the diffraction grating; and a polarizing element provided in an optical path between the beam dividing element and the information-signal light-receiving element, wherein the semiconductor laser element

Abstract: A semiconductor laser element which is composed of a compound semiconductor consisting of GaAs or the like, a silicon laser mount which is disposed beneath the semiconductor laser element so as to position the element, and on which an electrode layer as an electrode for the semiconductor laser element is formed, a heat sink which is disposed beneath the laser mount so as to dissipate, through the laser mount, the heat generated by the semiconductor laser element are mutually secured through hot contact bonding. The laser mount has a concave portion on the side opposite to its main surface on which the semiconductor layer element is secured, and the concave portion contains a heat dissipating body which is integrated thereinto and is made of copper having higher thermal conductivity than silicon.

Abstract: Radiating light from a semiconductor laser element is radiated in a direction normal to the surface of a photodetector substrate. The semiconductor laser element and photodetector are disposed on the same plane. Specifically, a reflecting mirror surface formed of a slanting surface of (111) lattice plane having a ridge line of <110> direction is disposed on a silicon substrate of (100) lattice plane having an off-angle of 4.degree. to 14.degree. about an axis of <110> direction or on a silicon substrate of (511) lattice plane having an off-angle of 1.degree. to 11.degree. about an axis of <110> direction. The semiconductor laser chip is disposed at a position opposing to the reflecting mirror surface.

Abstract: A semiconductor laser device comprising a first lead having a chip mounting part provided at the front end, at least one second lead separated from the first lead, a semiconductor laser element mounted on the chip mounting part, connecting means for electrically connecting the electrode of the semiconductor laser element and at least one second lead, and a frame body made of insulating material disposed so as to surround the semiconductor laser device and connecting means, and fixed to the first lead and second lead. In this semiconductor laser device, transparent resin is not used for sealing, and hence deterioration of light exit characteristic does not occur. Besides, because of the structure of fixing the leads to the frame body, it is rigid and excellent in reliability, and a multiplicity can be manufactured at once, so that it is easy to manufacture and is excellent in mass producibility.

Abstract: An optical head for optical recording and reproducing apparatuses is disclosed, which comprisesa semiconductor laser,a mirror for reflecting a light beam emitted from the semiconductor laser,a diffraction grating for dividing the light beam into zero order, plus and sinus first-order beams,a holographic diffraction grating being arranged at an optical path of the beams divided by the diffraction grating,an objective lens for focusing the beams on a disk and causing the beams reflected from the disk to be incident on the holographic diffraction grating to diffract the beams, anda photodetector for detecting a tracking error signal by receiving the beams diffracted by the holographic diffraction grating.The semiconductor laser has a beam incident area which the beam reflected from the disk is incident.The beam incident area acts to deflect the incident beam.As a result, the optical head is able to obtain the stable tracking error signal.

Abstract: The present invention relates to a semiconductor laser device on which a high-frequency signal can be superposed without radiating said high-frequency signal externally. Said device consists of a semiconductor laser element mounted directly or indirectly through a semiconductor substrate on a comb-frame, and an outer frame made of an insulation material provided at an area surrounding said comb-frame on which said semiconductor laser chip is mounted; and this device is fixed on a printed circuit board with a through-hole allowing a direct pass of laser light emitted from said semiconductor laser device. Said printed circuit board is provided with a high-frequency circuit and is lined with a metal film layer on the rear surface of said printed circuit board or within said printed circuit board.

Abstract: An optical head for optical recording and reproducing apparatuses is disclosed. The optical head comprises a semiconductor laser, a mirror for reflecting a light beam emitted from the semiconductor laser, a diffraction grating for dividing the light beam into zero order, plus and minus first-order beams. It also comprises a holographic diffraction grating being arranged at an optical path of the beams divided by the diffraction grating, an objective lens for focusing the beams on a disk and causing the beams reflected from the disk to be incident on the holographic diffraction grating to diffract the beams, and a photodetector for detecting a tracking error signal by receiving the beams diffracted by the holographic diffraction grating. The semiconductor laser has a beam incident area onto which the beam reflected from the disk is incident. The beam incident area acts to scatter or absorb the incident beam. As a result, the optical head is able to obtain a stable tracking error signal.

Abstract: A diffraction element includes a diffraction grating for dividing a light beam, emitted from a light source along a predetermined path, into a principal light beam and at least two auxiliary light beams, and a hologram for separating the beam, which has been reflected from an optical information recording medium, from the predetermined path. The diffraction grating and the hologram are integrated together by being formed in alignment with each other in opposite portions of a block of glass or plastics. A slide is provided at at least a portion of the diffraction element and includes a peripheral wall in sliding engagement with a cylindrical surface coaxial with an optical axis of the diffraction element to permit the diffraction element to be rotatable about the optical axis.