Sony Corporation

Norio Fukasawa

Junichi Suzuki

Takeshi Kubo

Masahiro Saito

Kiyoshi Toyota

Tetsu Tanaka

Satoru Ishii

Akio Machida

Toshio Fujino

Tadahiro Kono

Shinsuke Haga

Takatoshi Yamada

Katsuji Takagi

Souichi Murakami

Minoru Kubo

An embodiment of the invention provides a laser annealing method, including the steps of radiating a laser beam to an amorphous film on a substrate while scanning the laser beam for the amorphous film, crystallizing the amorphous film, detecting a light quantity of laser beam reflected from the substrate and a scanning speed of the laser beam while the radiation and the scanning of the laser beam are carried out for the amorphous film, and controlling a radiation level and the scanning speed of the laser beam based on results of comparison of the light quantity of laser beam reflected from the substrate, and the scanning speed of the laser beam with respective preset references.

Laser annealing method and laser annealing apparatus

An optical pickup apparatus and an optical disc apparatus are adapted to raise the efficiency of utilization of the lasers of the apparatus for accurately detecting tracking errors by raising the intensity ratio of the beam of the 0-th order to the beams of the &#xb1;1st orders produced by splitting of the laser beam of the wavelength to be subjected to division by three. The optical pickup apparatus includes a light emitting section for emitting a first laser beam having wavelength &#x3bb;and a second laser beam having wavelength &#x3bb;different from the wavelength &#x3bb;

Optical pickup apparatus and optical disc apparatus

An optical pickup device is provided which includes a double-wavelength objective lens () that collects a light beam selectively emitted from a light-emitting/-detecting element () that selectively emits a plurality of light beams different in wavelength from each other, and also return light from an optical disk (), a first diffraction grating () that splits the light beam emitted from a light-emitting/-detecting element () into three beams including a zero-order light beam and positive and negative first-order light beams, a second diffraction grating () that diffracts the return light for traveling along a light path separate from that of the outgoing light, and a third diffraction grating () that corrects a light-path deviation by diffracting the positive first-order light beam diffracted by the second diffraction grating (). The light-emitting/-detecting element () provides a focusing error signal FE by detecting the negative first-order light beam diffracted by the third diffraction element (), and a tracking error signal by detecting return portions of the positive and negative first-order light beams from the first diffraction grating ().

Optical pickup device, optical disk drive, optical device and composite optical element

Disclosed is an optical head in which position adjustment of a photodetector light receiving surface or component parts may be simplified, production costs may be reduced and operational reliability may be improved. The optical head includes a light source, radiating light of a preset wavelength, an objective lensfor condensing the outgoing light from the light sourceon an optical discand for condensing the return light from the optical disc, a beam splitterfor branching the optical path of the return light reflected by the optical disc, and for collimating the branched return light so as to be parallel to the outgoing light from the light source, a composite optical component including a splitting prismarranged on a site of incidence of the branched return light for spatially splitting the return light, and a light receiving unit for receiving plural return light beams spatially split by the splitting prismfor producing focusing error signals.

Optical head and recording and/or reproducing apparatus employing same

This invention is an optical pickup device having a composite optical element () which has a first diffraction grating () for splitting a light beam emitted from a light source () into zeroth-order light, plus-first-order light and minus-first-order light, a second diffraction grating () for diffracting the optical path of a return light beam from an optical disc (), and a split prism () arranged at a position where the minus-first-order light diffracted by the second diffraction grating () is incident and adapted for splitting the minus-first-order light into a plurality of light beams. It also has a light receiving unit () for acquiring a focusing error signal FE by receiving each return light beam split by the split prism () and for acquiring a tracking error signal by receiving return light beams from the optical disc () of the plus-first-order light and the minus-first-order light split by the first diffraction grating ().

Optical pickup device and optical disc device

An optical pickup device is provided which includes a first diffraction grating () that splits a light beam emitted from a light-emitting/-detecting element () into a zero-order light beam and positive and negative first-order light beams, a second diffraction grating () that diffracts return light from an optical disk () for traveling along a light path separate from that of the outgoing light, and a third diffraction grating () that corrects the deviation of the light path by diffracting the positive first-order light beam diffracted by the second diffraction grating (). The light-emitting/-detecting element () provides a focusing error signal FE by detecting the negative first-order light beam, and a tracking error signal by detecting return portions of the positive and negative first-order light beams from the first diffraction grating ().

Optical pickup device and optical disk device and optical device and composite optical element

Optical pickup and optical disc drive device

An optical lens composed of a transparent material, wherein one surface thereof on a light source side is a convex aspherical surface of rotation symmetry defined by a function relative to the radial distance from an optical axis. The aspherical surface is shaped to be a curved one without any stepped region with regard to the radial direction in the defined area, and has a portion where the derivatives of the function are discontinuous at a predetermined radial position. Although not equipped with an iris diaphragm, this optical lens is capable of eliminating an incident light beam outside the optical effective surface thereof without deteriorating the optical characteristics.

Growing community of inventors

Kanagawa, Japan

Norio Fukasawa