摘要:
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.
摘要:
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 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 direction or on a silicon substrate of (511) lattice plane having an off-angle of 1.degree. to 11.degree. about an axis of direction. The semiconductor laser chip is disposed at a position opposing to the reflecting mirror surface.
摘要:
An optical pickup apparatus which carries out recording/reproduction or deletion of information on an optical disc, including a semiconductor laser device in which at least two light sources are integrated, and a hologram optical element which has a plurality of outgoing light areas that divide light reflected from the optical disc, each light being emitted from the semiconductor laser device; the hologram optical element has division lines which divide the outgoing light areas at a position intersecting with each optical axis of the reflected light. The optical pickup apparatus is able to detect a signal corresponding to a light beam divided almost equally in two, even when any one of the plurality of light sources are operating.
摘要:
A three-dimensional virtual space simulator comprises a section for determining the action of an avatar according to the input by the user and generating action instruction data representing the content of the action, a section for determining the action of an agent autonomously and generating action instruction data representing the content of the action, and a process control section for displaying each character in a virtual space according to the action instruction data received from the sections wherein the process control section and a graphic process section share an interface for receiving the action instruction data from the avatar action instruction section, and an interface for receiving the action instruction data from the agent action instruction section. Consequently, a flexible participation mode of the user and high reliability are realized.
摘要:
A diffraction grating element including a diffraction grating area which includes: a first area that is one of two areas into which the diffraction grating area is divided by a first straight line, and is divided, by a second straight line perpendicular to the first straight line, into a first sub-area having a first diffraction grating pattern and a second sub-area having a second diffraction grating pattern, the first and second diffraction grating patterns having different diffraction angles; and a second area that is the other of the two areas into which the diffraction grating area is divided by the first straight line, and is divided into three or more divisional areas that align in a direction perpendicular to the second straight line, the first and second diffraction grating patterns being alternately assigned to each of the divisional areas.
摘要:
A first diffractive optical element pattern with a pattern pitch that is no greater than a wavelength of incident light is formed on a first main surface of substrate such as a glass plate. Second diffractive optical element patterns are formed at positions that are respectively incident to positive first-order diffracted light and negative first-order diffracted light produced by the first diffractive optical element pattern. Negative first-order diffracted light produced by each second diffractive optical element pattern is incident upon a boundary face of the substrate at an angle that is smaller than the critical angle, and so exits the substrate.
摘要:
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.
摘要:
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.
摘要:
An optical head for optical recording and reproducing apparatuses is disclosed, which 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 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, 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 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.
摘要:
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.