Matches 201 - 250 out of 544 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
6084842 Reflective light beam focusing device with multiple focal points  
A multiple focal light beam generating device is provided with a multiple focal mirror device, to which a light beam is incident from a front side thereof. The device has a plurality of mirror...
6078555 Optical head assembly having compatibility with digital versatile disk (DVD) and a recordable compact disk (CD-R) and for obtaining a high-speed access time  
An optical head assembly having compatibility with a recordable compact disk (CD-R) and a digital video disk (DVD) includes a stationary first optical unit and a second optical unit which moves to...
6072762 Optical disk recording/reproducing method and apparatus for preventing wave length shift during recording and reproducing operations  
Between a semiconductor laser diode and an optical disk, a collimator lens for collimating a laser beam output from the semiconductor laser diode, a liquid crystal optical shutter for attenuating...
6067283 Optical pickup  
An optical pickup is provided for reproducing information recorded on optical recording mediums including a first recording medium having a predetermined first distance from a surface of the medium...
6052353 Double refraction plate with refractive grating pattern around a centerally disposed transparent region to allow the passage of either an ordinary ray or an extraordinary ray  
6043935 Wavelength sensitive beam combiner with aberration correction  
A wavelength sensitive hologram which combines the 780 nm laser beam and the 650 nm laser beam to produce a compact DVD optical pickup. The 780 nm laser beam is incident on the hologram at an angle...
6044048 Optical pickup and optical disc device for accessing media of differing recording densities  
An optical pickup in an optical disc device configured for recording and/or reproducing signal on or from an optical disc. The optical pickup is configured for setting the orientation of a bending...
6038204 Optical source module for generating beams with different wavelengths  
A different wavelength type of optical source module which generates light beams different in wavelength. In the optical source module, laser diodes are provided to be opposed to each of reflective...
6031810 Using two laser sources on a magneto-optical recording medium for preventing light intensity shortage  
An optical information recording/reproducing apparatus records information on an optical information recording medium and/or reproduces the recorded information by irradiating a plurality of light...
6023450 Multiple beam optical pickup using a vertical cavity surface emitting laser array  
An optical pickup capable of multiple track scanning, including a light source having at least two vertical cavity surface emitting lasers (VCSELs) to emit at least two or more light beams and a...
6009054 Information recording medium and tracking error signal detection apparatus and magnetic recording apparatus and method of adjusting the magnetic recording apparatus  
In a magnetic recording medium to detect tracking error signals optically where an optical head and a magnetic head scan different tracks, two signals having phases different by π/2 are generated...
6009066 Optical pickup of two different wavelength laser sources with an objective lens having an annular shielding region  
An optical pickup compatible with at least two types of optical recording media using light beams having respectively different wavelengths for recording and reproducing information. In the optical...
6002656 Device for inspecting the surface of disc-shaped recording medium  
A device for inspecting the surface of a disc-shaped recording medium is provided. The inspection device is capable of performing track control unaffected by the widths of the land and the groove...
5999509 Optical pickup device with two independent light beams and an integrated prism for providing return light with astigmatism  
An optical pickup or an optical head capable of favorably irradiating a plurality of independent different light beams and receiving return light with a simple structure. The optical pickup is...
5986998 Optical head having two vertical cavity surface emitting lasers with different wavelengths  
An optical pickup which can be employed for different formats of a disk recording medium is disclosed. The optical pickup device includes a light source including first and second vertical cavity...
5982733 Optical head  
An optical head emits a plurality of light beams onto an information record medium to perform a recording operation and/or a reproducing operation. The optical head is provided with: a plurality of...
5982732 Optical head having multiple light sources having different wavelengths  
An optical head includes a fixed optical system having a first light source for outputting a first collimated light having a first wavelength, a first detection system for receiving a reflection of...
5978343 Multiple track scanning method for optical pickup  
A method of scanning multiple tracks uses an optical pickup to simultaneously emit a plurality of beams on a plurality of tracks on a disk, and satisfies the equations: N j =(N b -1)N g -1 and N...
5974019 Optical system for two-dimensional positioning of light beams  
A positioning system for selectively directing a first beam of light towards a destination and a second beam of light towards a first diffractive optic. The first beam of light and the second beam...
5963515 Optical pickup device for detecting a tracking error of a main spot on an optical disk  
An optical pickup device includes a light source which emits a light beam. A beam converting system converts the light beam emitted by the light source into a main beam and four side beams so that...
5959953 Methods and apparatus for performing cross-talk correction in a multi-track optical disk reader based on magnification error  
An optical pickup assembly for a multitrack optical disk reader includes a multi-element photodetector onto which a plurality of reflected track images are projected. Circuitry is provided for...
5956312 Pickup apparatus and method for laser beams having different wavelengths  
There is provided an optical pick-up apparatus including (a) a plurality of light emitting devices emitting laser beams having different wavelengths, (b) inclined reflective surfaces by the same...
5940360 Optical pickup device for reproducing discs of two types with different densities by double beam focuses of different sizes  
Beams generated from first and second laser light sources are reflected by a beam splitter to proceed toward an optical disc. The laser beams focus onto the optical disc via a selective...
5936920 Tracking method and device for use with an optical recording medium  
During recording of data on a recording medium, tracking is performed using auxiliary beams to refer to guide tracks as done in the conventional three-beam method. During reproduction of data from...
5933401 Optical pickup having plural optical sources and plural optical detectors  
An optical pickup capable of compatibly adopting disks of different formats which are placed in an optical player includes a first optical source for emitting light having a predetermined...
5930222 Pre-pit detecting device and information recording apparatus employing the same  
The irradiation device irradiates, at the time of recording main information, a first light beam having a first power and a second light beam having a second power on the pre-pits in a...
5923632 Optical pick-up device for a multi-layer recording medium with a photodetector arrangement for focusing and tracking control  
An optical pick-up device invention is adapted according to the present invention to reproduce an information signal recorded on a multi-layer optical disc having a plurality of information signal...
5923626 Recording or playback devices for optical information carriers having a different track width  
The present invention to provides for information carriers of different storage densities, a recording and/or playback device which is compatible or can be used for different optical information...
5923636 Optical pickup  
An optical pickup for recording on and reproduction from recording media of different recording densities (e.g. a high density disk such as a DVD and a lower density disk such as an ordinary CD),...
5917797 Multi-beam optical pickup assembly and methods using a compact two-dimensional arrangement of beams  
Apparatus and methods for reading an optical disk are provided that use a compact two-dimensional arrangement of beams, with each beam aligned with a track on an optical disk, to provide a compact...
5917790 Optical information recording/reproducing method and apparatus for performing auto-tracking control using a three-beam method, with respect to first and second recording media having different track pitches  
Different tracks on an optical information recording medium are irradiated with first and second light spots for auto-tracking. The light of the first light spot via the recording medium is...
5912872 Integrated optical apparatus providing separated beams on a detector and associated methods  
An integrated optical apparatus includes an optically transparent substrate with a light source and a detector mounted adjacent thereto. The substrate includes an optical element in a transmit path...
5909418 Optical information recording device and method for detecting and verifying recorded information  
A laser light beam generated from a light source is divided by a diffraction grating into a plurality of light beams, i.e., a single main beam to be used for recording information and plural...
5909416 Land/groove detecting method and apparatus for an optical disk  
The invention relates to a technique to detect lands and grooves formed on an optical disk, and is intended to provide a land/groove detecting apparatus capable of steadily obtaining track...
5909412 Method for reproducing optical disk  
In a method for reproducing an optical disk of the present invention, address information of an optical disk, provided with tracking guides composed of (1) a wobbling groove wobbled in accordance...
5905708 Focusing two polarized beams onto different information carrier layers of a single optical disc  
A device for reading from or writing to an optical recording medium is disclosed which has at least two information carrier layers spaced apart from one another, as well as a light source, an...
5905703 Optical disk apparatus having an improved tracking control system  
An optical disk apparatus for stable tracking and reproduction of information recorded on a high density disk, the apparatus cancels various noise components in the tracking error signal....
5901132 Pickup head having two laser light sources for separately reading an optical disk with two recording layers  
An optical pickup system for regenerating information stored on an optical disk including a pair of recording surfaces thereon, is provided with a pair of light sources, a detector, an objective...
5896360 Optical pickup device and optical disc driving apparatus having light polarizing hologram  
An outgoing light beam from a laser light source 42 of a laser module 41 is radiated via a light polarizing hologram 51 on a two-segment optical rotation plate 52 of a movable unit. The two-segment...
5894464 Hologram optical pick-up using two laser sources  
A hologram optical pick-up device using a first and second laser sources emit laser beams having different wavelengths, which are then focused by an objective lens on a disc, and reflected at a...
5892744 Optical disk drive tracking error detection unit  
A tracking error detecting unit outputs a tracking error signal for two types of optical disks having different recording densities. The tracking error detecting unit includes a diffraction grating...
5892749 Optical head device for reading two optical disks  
An optical head reader includes a laser light source; a polarization beam splitter for dividing first and second linearly polarized beams having first and second polarization directions which are...
5886964 Optical head tracking error detection device  
To achieve a tracking error detection, a device for use in a simple optical system is disclosed which reduces offset resulting from the lateral movement of an objective lens or a tilt of an...
5883874 Optical pickup system for selectively reading a multiple number of optical disks  
An optical pickup system reads an information signal from stored on one of a first and a second optical disks alternatively to be loaded on a disk tray, wherein each of the optical disks may have a...
5883873 Focusing distance of an objective lens according to a vertical deviation standard of optical recording media with different thicknesses  
An optical recording and reproducing device of the present invention has an objective lens designed so as to form a light spot with a set diameter on a DVD, while to form, on a CD, a light spot...
5875167 Optical head device  
Disclosed is an optical head device, including: a first light source which emits light with a first wavelength; a second light source which emits light with a second wavelength; first and second...
5862118 Optical pickup with an optical system controlled by an actuator with respect to one of the information recording layers  
An optical pickup apparatus for reproduction of an information record medium in which information record layers are multiply formed is provided with: a light source for emitting a light beam; a...
5859817 Optical disk apparatus and track access control method for optical disk apparatus for reducing the relative position shift between two beam spots which are emitted through two objective lenses  
An optical disk apparatus includes first and second objective lenses, a carriage, a moving mechanism, a fixed optical system, a main control section, track access control circuits, a first...
5856959 Method for generating a focus error signal due to astigmatism and optical pickup device using the same  
A method and an optical pickup device for generating a focus error signal are disclosed. The device includes an irradiation optics for irradiating laser beams onto an information recording surface...
5854780 Optical scanning device using a plurality of scanning spots  
An optical scanning device using one or more rows of scanning spots for simultaneously scanning a plurality of information tracks of an optical record carrier. The resulting radiation produced from...
Matches 201 - 250 out of 544 < 1 2 3 4 5 6 7 8 9 10 11 >