摘要:
A primary optical disk recording apparatus comprises a first light source for recording a signal on a primary optical disk, an objective lens for converging a light beam from the first light source on the primary optical disk, a second light source for detecting a focus error between the objective lens and the primary optical disk, and a controller for detecting a reflection light beam from the first light source, which is reflected from the primary optical disk, while the signal is being recorded on the primary optical disk, and for subjecting a signal of the reflection beam to an arithmetic operation process, thereby detecting a first focus error signal and controlling the focus error on the basis of the first focus error signal.
摘要:
An optical disk apparatus includes a semiconductor laser for emitting a light beam, and an automatic power control or APC circuit for driving the laser. A compound prism structure is optically coupled to the laser in an optical head section, and defines a first optical path for causing a front laser light to be projected onto a rotating optical disk and guiding a reflected light therefrom toward a first photodetector, and a second optical path for guiding a part of the reflected light toward a second photodetector. An output signal of the first photodetector is used to generate a reproduced information signal. An output signal of the second photodetector is fed back to the APC circuit as a front light monitor signal. A part of a laser control signal internally generated in the APC circuit is supplied through a wiring line to a noise reduction circuit as a laser noise monitor signal. The noise reduction circuit subtracts this noise monitor signal from the reproduced information signal to provide a noise-suppressed information signal.
摘要:
An optical head device adapted to be optically coupled to an optical disk includes a light-source laser and an objective lens optically coupled thereto. This lens receives an output light of the light source, and causes it to be projected onto the optical disk to form a focused spot thereon. Photodetectors which are arranged near the light-source laser are optically coupled to the lens in one optical path so that they are responsive to a light component which is reflected from the optical disk toward the photodetectors by way of the objective lens. A beam-shaping prism is located between the lens and a group of the light source and the photodetectors in the optical path. When the laser output light travels toward the lens, the prism reshapes the light into a predetermined isotropic beam profile. When the reflected light from the optical disk propagates reversely along the same optical path to enter the beam-shaping prism, this prism permits such an incident light to pass through itself toward the photodetectors.
摘要:
An optical head device adapted to be optically coupled to an optical disk includes a light-source laser and an objective lens optically coupled thereto. This lens receives an output light of the light source, and causes it to be projected onto the optical disk to form a focused spot thereon. Photodetectors are optically coupled to the lens in one optical path so that they are responsive to a light component which is reflected from the optical disk toward the photodetectors by way of the objective lens. A beam-shaping prism is located between the lens and a group of the light source and the photodetectors in the optical path. When the laser output light travels toward the lens, the prism reshapes the light into a predetermined isotropic beam profile. When the reflected light from the optical disk propagates reversely along the same optical path to enter the beam-shaping prism, this prism permits such an incident light to pass through itself toward the photodetectors.
摘要:
An image scanning device includes: a light source; a light guide for converting light from the light source into a linear light beam and applying the linear light beam onto a reading position; an image reading element for receiving the light beam reflected from the reading position; and a light intensity sensor for detecting an intensity of the light emitted from the light source.
摘要:
An image reading apparatus for reading an image of a document optically by illuminating a document with light emitted from a plurality of light emitting elements arranged linearly and by reading light reflected from the document. The image reading apparatus has a first light emitting element for emitting light in a first direction, a second light emitting element for emitting light in a second direction and one substrate for supporting the first light emitting element and the second light emitting element thereon.
摘要:
A dividing plate for a thin-film deposition apparatus divides the interior of the vacuum reaction chamber into a plasma discharge space and a film deposition process space, by fixing or connecting a plurality of laminated plates together by securely bonding them over the entire area of their interfacial surfaces, or a large portion thereof.
摘要:
A heating element CVD system and a heating element CVD method which are capable of forming a high quality polycrystalline silicon film (polysilicon film) as a device in the case of producing a silicon film by using a heating element CVD system. The heating element CVD system and the heating element CVD method heat and maintain the inner surface of the structure surrounding the space between the substrate holder and the heating element to be at least 200° C. or higher, preferably at least 350° C. or higher during the formation of the silicon film on the substrate.
摘要:
To provide a loop antenna capable of attenuating the distant electric field with the attenuation of the magnetic flux in the vicinity of an electromagnetic wave restrained, and a contactless IC card read/write apparatus.A loop antenna 10 has an electromagnetic wave shield 1 over at least one side of the loop antenna, the electromagnetic wave shield 1 comprising a plurality of electric conductors 2, a ground contact 3 for grounding the plurality of electric conductors and a lead wire 4 for connecting the plurality of electric conductors 2 to the ground contact 3. The plurality of electric conductors 2 are electrically connected via the lead wire 4 to the ground contact 3 and the plurality of electric conductors 2 are arranged so that the paths of the respective electric conductors 2 from any of their given points to the ground contact 3 via the lead wire 4 are determined uniformly.
摘要:
A chemical vapor deposition apparatus has a vacuum processing chamber, a susceptor for holding a plurality of substrates each placed with a film deposition surface thereof facing downward; a heater disposed above the susceptor; a first barrier gas supply port for supplying a barrier gas to the upper surface of the susceptor; and a second barrier gas supply port for supplying the barrier gas to the upper surface of the heater. The barrier gas supplied from the first barrier gas supply port and the barrier gas supplied from the second barrier gas supply port have their flow rates controlled independently. By properly setting the ratio between the amount of the barrier gas supplied from the first barrier gas supply port and the amount of the barrier gas supplied from the second barrier gas supply port and the ratio between the amount of the barrier gas supplied and the amount of a raw material gas supplied, it becomes possible to form a film which is reduced in the number of particles adhered thereto.