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RE40371 |
Optical disc recording/reproduction apparatus and method
An optical disc recording/reproduction apparatus for recording and/or reproducing a data by applying a beam from an optical head unit through a substrate onto/from a recording layer of the optical...
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7379398 |
Optical disc apparatus, an optical disc method, and a semiconductor integrated circuit capable of adjusting a focus position of a light beam and a spherical aberration
An optical disc apparatus includes a control section. The control section performs a first search while the tracking control is in the off state. The first search is for searching for a plurality...
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7369482 |
Optical pick-up aberration correcting mirror, aberration correcting method and optical pick-up
It is an object of the invention to provide an aberration correcting mirror which has a small size, power saving, a low voltage, a low price and high precision. In particular, it is an object to...
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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...
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7359293 |
Optical pickup device
An optical pickup device is applied to DVD recorders and includes a beam expander unit. A drive coil wound around a lens holder within the beam expander unit, is located in a magnetic field formed...
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7358470 |
Optical pickup
An optical pickup with a reflective coating device is provided, including a laser diode (LD), an optical element, and a photo detector integrated circuit (PDIC). The LD emits 1-3 lights with...
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7355932 |
Optical disk device for detecting thickness errors of the transparent substrate
The invention detects the thickness error of the transparent substrate using a general focus error signal detection system employing the fact that the reflecting light from the optical disk causes...
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7355798 |
Optical system for collimating elliptical light beam and optical device using the same
An optical system ( 20 ) for efficiently collimating an elliptical light beam includes a light source ( 21 ), a collimator ( 22 ), and at least one prism ( 23,24 ). The light source is adapted for...
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RE40229 |
Optical recording/reproducing apparatus for optical disks with various disk substrate thicknesses
An optical disc apparatus for recording, reproducing or erasing an information signal by converging a light flux onto a recording layer through a transparent substrate. The apparatus includes one...
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7352664 |
Optical element, optical head, optical recording reproducing apparatus and optical recording/reproducing method
The invention presents an optical element with which an optical head can be configured, in which there is little deterioration of the correctional effect when the objective lens shifts, as well as...
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7345983 |
Optical pick-up device and optical information recording reproducing apparatus
An optical pickup apparatus includes: first-third light sources; a packaged multiple light source unit for packaging emitting points of at least two of the first-third light sources in one housing;...
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7345967 |
Optical pickup unit
An optical pickup unit includes a light source emitting a light beam, an objective lens focusing the light beam onto an information recording medium, a light detection part receiving the light beam...
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7342852 |
Method and apparatus for differing focus between at least two dimensions
The present invention obtains a more optimal focus in at least two dimensions (such as axial and radial dimensions) by setting or keeping a focus in at least a first dimension (such as both axial...
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7317668 |
Information recording and/or reproducing apparatus
An information recording and/or reproducing apparatus includes a laser light source from which a laser beam having a wavelength of from 220 nm to 280 nm exits; and a converging lens unit disposed...
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7310297 |
Optical disk device
This invention provides an optical disk device comprising an optical pick-up being structured to irradiate light beams onto an optical disk through an objective lens unit, receive the light beams...
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7307933 |
Optical disc drive
An optical disc drive according to the present invention reads and/or writes data from/on an optical disc having at least one information layer with a light beam and includes: a spherical...
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7301872 |
Optical pickup and optical disc drive device
The present invention relates to an optical pickup and an optical disc drive that records or reproduces data signals on or from optical discs different in specifications, such as recording density...
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7301864 |
Objective lens, optical pick-up device, and optical disk device
To provide an optical pickup device and optical disk device capable of realizing at least one of thickness reduction, size reduction and suppression against characteristic deterioration even where...
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7283439 |
Optical disk apparatus using mechanism for controlling spherical aberration
In the past there has been a problem that on a detection surface the influence of interference causes a defocusing signal to degrade, narrowing the range in which spherical aberration can be stably...
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7280458 |
Optical pickup apparatus and optimal light spot focusing method
An optical pickup apparatus includes a first light source to emit a first light beam having a predetermined wavelength, a first optical path changer to change a proceeding path of the first light...
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7280444 |
Objective optical element, optical pickup device, and optical information recording and reproducing device
An objective optical element to be used for an optical pickup device for performing reproducing and/or recording of information to a first optical information recording medium and a second optical...
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7274632 |
Optical head device and method for correcting spherical aberration
On an optical disk in a recording and/or playback apparatus, the position at which the thickness error of a light transmission layer is in the optical axis of an objective lens 11 , and the...
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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...
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7260033 |
Optical reproducing apparatus
An optical reproducing apparatus that uses a hologram laser module and is applicable to a DVD Multi drive, wherein five sub spots of light in total that are most suitable to perform the...
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7260032 |
Focal point adjusting method, and optical pickup device
A focus control process (S 2 ), a spherical aberration correcting process (S 4 ), and a focus offset adjusting process (S 7 to S 9 ) are performed in this order. In the focus control process, an...
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7257070 |
Optical disc recording and/or reproducing apparatus and aberration adjustment method
The astigmatic aberration in an optical system is to be adjusted. Specifically, in an optical disc device on which can be selectively loaded a first optical disc having a first index of double...
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7251203 |
Optical disc drive apparatus, information reproducing or recording method
Disclosed here is a method for solving a conventional problem that no spherical aberration signal can be detected from any push-pull signal that is easy to adjust an object photodetector when a...
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7251087 |
Lens driving apparatus and image pick-up apparatus including the same
An image entering from the left side of the figure passes through a correcting lens unit, and forms an image on an image pickup device on the right side of the figure. The correcting lens unit...
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7248544 |
Optical head and recording and/or reproducing apparatus employing same
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...
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7247827 |
System for measurement of the height, angle and their variations of the surface of an object
A system for measurement of the height, angle and their variations of the surface of an object comprises a measurement module and an astigmatic optical path mechanism. The optical path mechanism...
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7242510 |
Aberration correction element, optical pickup, and information equipment
An aberration correction element is intended to correct an aberration. The aberration correction element is placed in a middle of an optical path between a light source and an optical element for...
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7236445 |
Optical head for recording and reading information and objective lens for use therein
An objective lens used in an optical head having a convex lens and a chromatic aberration correction optical element wherein there is provided a positioning means that positions the center of...
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7230905 |
Optical pickup using two-wavelength light source module and method for correcting position difference
An optical pickup includes a light source module in which first and second light sources that emit first and second light beams of different wavelengths are integrated into a single package, an...
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7230888 |
Light emitting device and information processing apparatus
A light emitting device according to the present invention includes: a first light source for emitting light having a first wavelength; and a second light source for emitting light having a second...
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7227817 |
Low profile optical head
An optical head of a type useable in a optical disk reader/writer is provided. The optical head has a low profile, e.g., in a vertical direction parallel to the disk spin axis, such as less than...
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7224645 |
Optical information processing system using optical aberrations and information medium having recording layer protected by transparent layer having thickness irregularity
A thickness servo system using optical aberrations, wherein a photodetector detects an aberration amount corresponding to thickness irregularity, and a thickness irregularity correction section...
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7215630 |
Micro mirror unit, optical disc drive using same, and method for producing micro mirror unit
The hinge ( 13 ) should preferably be formed to have a higher resistance than ever against the pivoting of the mirror body ( 12 ) to effectively prevent the hinge ( 13 ) from being damaged. By...
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7215605 |
Optical scanning device with coma correction for improved focus tracking signal
An optical scanning device ( 1 ) includes: a radiation source ( 4 ) for supplying a radiation beam ( 8 ); a lens system ( 5 ) for transforming the radiation beam to a scanning spot ( 14 ); and a...
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7215476 |
Optical pickup, optical information recording/reproducing apparatus using the same, and phase variable wave plate used in the pickup and the apparatus
Laser beams respectively emitted from a SHG blue laser unit and a red semiconductor laser unit that have photo detectors respectively are turned into parallel lights by a collimator lens and then...
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7209415 |
Optical pickup device and recording and/or reproducing device
Provided are an optical pickup device, which is capable of detecting and correcting spherical aberration while suppressing an increase in the number of construction elements and without increasing...
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7209414 |
Spherical aberration compensation by wavelength
A method for minimizing spherical aberration in an optical read/write drive caused by variances in lens thickness and laser wavelength. The method provides an economic solution that pairs objective...
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7206277 |
Optical pickup device and focal error detecting device therefor and wave aberration and focal error detecting device therefor
An optical pickup device includes an irradiating optical system for converging a light beam to form a spot on a recording surface via a light-transmitting layer of an optical recording medium, and...
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7200098 |
Objective lens for high-density optical focusing and an optical disk in an optical pickup
An optical pickup includes a light source emitting a laser beam and an optical path changing unit altering a traveling path of an incident beam. An objective lens, disposed on an optical path...
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7193954 |
Optical pickup device and objective lens for the optical pickup device
An optical pickup apparatus includes first, second and third light sources; a light converging optical system including a first objective optical element and a second objective optical element,...
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7184384 |
Optical pickup
An optical pickup converts a laser beam from a semiconductor laser ( 1 ) into a parallel ray with a collimator lens ( 2 ), and divides it into a main beam ( 30 ), a sub-beam (+1st order component)...
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7177259 |
Optical head and optical recording medium drive device
The present invention is directed to an optical head adapted for performing recording or reproduction of information signals with respect to an optical disc ( 102 ), which controls light coupling...
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7177089 |
Objective, optical pickup apparatus and optical information recording and/or reproducing apparatus
An objective is used in an optical pickup apparatus which conducts reproducing and/or recording information for three different types of optical information recording media each having different...
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7173888 |
Recording apparatus for and method of improving overwrite characteristics
A recording apparatus and method for recording a mark on a recordable recording medium includes an optical pickup having a light source and an objective lens for focusing light emitted from the...
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7170844 |
Optical pick-up apparatus and correction lens for use in the apparatus
In an optical pick-up apparatus for recording to or reproducing from an optical information recording medium, the optical pick-up apparatus includes: a light source for emitting light flux; a light...
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7170832 |
Optical scanning device
A optical scanning device ( 1 ) for scanning an information layer ( 2 ) with a radiation beam ( 25 ) in a writing mode and a reading mode comprises a radiation source ( 7 ) for emitting the beam...
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