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7430159 Optical pick-up and objective lens for use with different types of optical discs  
There is provided an optical pick-up used for recording data to and/or reproducing data from at least three types of optical discs having at least two different thicknesses of cover layers. The...
7403453 Optical disk apparatus compatible with different types of mediums adapted for different wavelengths  
A polarizing beam splitter for separating an upstream beam from a downstream beam according to the polarization of an incident beam is provided between first and second light sources emitting laser...
7397752 Pickup for magneto-optical recording medium  
A pickup for a magneto-optical recording medium is provided, which improves quality of reproduced signals by eliminating a phase difference between the polarizations and is capable of coping with...
RE40329 Single objective lens for use with CD or DVD optical disks  
An optical disk reader or read/write system for CD or DVD formats. First and second laser diodes operating at different wavelengths have their output beams collimated and directed at a single...
7372794 Compatible optical pickup applying tilt to objective lens in proportion to radial movement of objective lens  
A compatible optical pickup compatibly using a high density recording medium and at least one low density recording medium, includes an objective lens to form a light spot suitable for use on a...
7366078 Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method  
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
7343103 Apparatus and method for detecting beam power in optical drive  
An apparatus and method for detecting beam power generated by a plurality of light sources, using a single device. The apparatus includes a light-receiving unit that receives the beam power...
7342851 Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method  
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
7283452 Objective lens having two aspheric surfaces and a phase shifter and optical device including the same  
An objective lens in which a first wavelength is used in reading a first optical disk, a second wavelength is used in recording or reading a second optical disk, and a phase shifter provided with...
7268947 Diffractive optical element and optical head using the same  
A diffractive optical element emits substantially zero order diffracted light when light with a wavelength of 0.35 μm to 0.45 μm is incident and emits substantially first-order diffracted light...
7260047 Optical pickup that uses light sources with different wavelengths for each of multiple recording mediums  
An optical pickup includes: a first projector for projecting a first light beam of a first wavelength so as to record and reproduce information with respect to an optical disk having a first light...
7186006 Reduced-footprint night illumination laser system  
The present invention provides for a laser diode light diffusion unit that comprises a casing 10 with a lens cover that holds a laser diode mounted 2 on a heat sink 16, a mirror 12, a...
7173897 Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method  
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
7173896 Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element and information recording/reproducing method  
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
7173895 Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method  
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
7164625 Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method  
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
7151735 Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method  
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
7088645 Optical pickup apparatus compatible with different types of optical recording mediums  
A polarizing beam splitter for separating an upstream beam from a downstream beam according to the polarization of an incident beam is provided between first and second light sources emitting laser...
7072114 Optical pickup using an optical phase plate and which is compatible with optical recording media of different types  
An optical pickup apparatus having laser light sources emit a first light beam having a relatively shorter wavelength for a DVD and a second light beam having a longer wavelength for a CD-R, an...
7068933 Apparatus and method for detecting beam power in optical drive  
An apparatus and method for detecting beam power generated by a plurality of light sources, using a single device. The apparatus includes a light-receiving unit that receives the beam power...
7050207 Optical pickup device using hologram pattern and hologram pattern generating method  
Astigmatism and coma are suppressed in an optical pickup device such that light from a single real laser light source is diffracted and divided by a hologram module into a plurality of light spots...
7046611 Optical pickup compatible with a digital versatile disk and a recordable compact disk using a holographic ring lens  
An optical pickup apparatus compatible with at least two types of optical recording media, using light beams having respective different wavelengths for recording and reading information, the...
7035193 Objective lens for optical disc  
An objective lens for recording data to and/or reproducing data from first and second optical discs. The objective lens is provided with at least one surface including a plurality of annular zones...
6987615 Diffractive optical element and optical head using the same  
A diffractive optical element emits substantially zero order diffracted light when light with a wavelength of 0.35 μm to 0.45 μm is incident and emits substantially first-order diffracted light...
6985293 Optical pickup using an optical phase plate and which is compatible with optical media for different types  
An optical pickup apparatus having laser light sources emit a first light beam having a relatively shorter wavelength for a DVD and a second light beam having a longer wavelength for a CD-R, an...
6956807 Optical head for scanning a record carrier  
A device for scanning a first and second type of optical record carriers ( 2; 40 ) generates a first and a second radiation beam for scanning the first and second type of record carriers,...
6950384 Optical pickup appratus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method  
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
6894958 Optical system for detecting data signal and tracking error signal  
In an optical head apparatus, reflected light from the disk is diffracted by a hologram optical element, and received by an optical detector. A focusing error signal is detected from −1st-order...
6882614 Recording/reproducing apparatus having an optical pickup device to read from and record information to disks of different thicknesses  
A recording/reproducing apparatus having an optical pickup device which is efficient in light use having little spherical aberration. The recording and/or reproducing apparatus includes an optical...
6870805 Optical pickup apparatus, recording/reproducing apparatus provided with the optical pickup apparatus, optical element, and information recording/reproducing method  
An optical pickup apparatus for reproducing information from an optical information recording medium or for recording information onto an optical information recording medium, is provided with a...
6834036 Optical head for a plurality of types of information recording media  
An optical head with high light utilization efficiency that includes a diffractive optical element and a light source emitting beams with a plurality of wavelengths that can read plural types of...
6816449 Optical pickup compatible with a digital versatile disk and a recordable compact disk using a holographic ring lens  
An optical pickup apparatus compatible with at least two types of optical recording media, using light beams having respective different wavelengths for recording and reading information, the...
6791933 Optical pickup using an optical phase plate  
An optical pickup apparatus having compatibility with a recodable compact disk (CD-R) and a digital video disk (DVD), which uses a wavelength of one of a first light beam and a second light beam...
6788636 Optical pickup compatible with a digital versatile disk and a recordable compact disk using a holographic ring lens  
An optical pickup apparatus compatible with at least two types of optical recording media, using light beams having respective different wavelengths for recording and reading information, the...
6674059 Objective lens and optical pickup  
By providing an area of a smaller numerical aperture and an area of a greater numerical aperture on an objective lens, forming holograms of different characteristics corresponding to the respective...
6639889 Recording/reproducing apparatus including an optical pickup having an objective lens compatible with a plurality of optical disk formats  
A recording/reproducing apparatus including an optical pickup compatible with a plurality of optical recording media each using light of a different wavelength. The optical pickup includes at least...
6552990 Optical head for two different disk thicknesses with a light beam diameter control device  
An optical pickup device which includes a semiconductor laser selectively generating a laser beam with a wavelength of 635 nm, a laser beam with a wavelength of 780 nm, and an optical device having...
6480455 Optical pickup device applicable to two kinds of recording media with minimized deterioration of a beam spot  
An optical pickup device shares an objective lens for two different light sources so as to handle two kinds of optical recording media, that is, a first optical recording medium and a second...
6479197 Method of manufacturing two-color filter  
A method of manufacturing a two-color filter. The method includes forming a first metallic layer over a substrate and then forming a second metallic layer over the first metallic layer. A patterned...
6442124 Compatible optical pick-up apparatus for recording and reproducing information from recording media having different formats  
An optical pick-up apparatus for recording and reproducing information from recording media using a first, second, and third light source to emit light beams having various wavelengths...
6392977 Optical pickup with a hologram to limit the aperture of two light beams with different wavelengths  
An optical pickup device that is able to record/reproduce information signals for first and second optical discs with different recording capacities. The optical pickup device includes an objective...
6388977 Hologram laser unit and optical pickup device including the same  
A hologram laser unit to be used for performing recording and reproducing operations of information for an optical disk, includes a light source, a photodetector, and a hologram element which are...
6353587 Optical pickup  
A first light source of an optical pickup emits a first laser beam having a first predetermined wavelength. A second light source emits a second laser beam that substantially perpendicularly...
6345029 Optical pickup apparatus and method  
An optical pickup apparatus and method which can selectively perform optical pickup with respect to at least two types of optical disks, on which information recording surfaces are formed, having a...
6344935 Optical system of optical pick-up  
An optical system of an optical pick-up that is capable of using optical discs DVD and CD. The system includes a light source portion for selectively emitting a first laser beam (650 nm) and a...
6343058 Optical pickup device applicable to two kinds of recording media with minimized deterioration of a beam spot  
An optical pickup device shares an objective lens for two different light sources so as to handle two kinds of optical recording media, that is, a first optical recording medium and a second...
6342976 Luminous flux diameter variable type objective lens and optical apparatus using the same  
A luminous flux diameter variable type objective lens having a wavelength selectivity is disposed within a luminous flux. Arranged on a surface of the lens are a first region 11 with no...
6275461 Optical pickup using an optical phase plate  
A recording/reproducing apparatus includes an optical pickup device having an optical phase plate which is compatible with optical recording mediums having different thicknesses, and an optical...
6272096 Optical pickup using an optical phase plate  
An optical pickup apparatus having compatibility with a recodable compact disk (CD-R) and a digital video disk (DVD), which uses a wavelength of one of a first light beam and a second light beam...
6222812 Optical pickup using an optical phase plate  
An optical pickup apparatus having compatibility with a recodable compact disk (CD-R) and a digital video disk (DVD), which uses a wavelength of one of a first light beam and a second light beam...
Matches 1 - 50 out of 64 1 2 >