| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 369112040 | Plural distinct diffractive optical elements | 17 |
| 20080205244 | Optical head, optical disc apparatus including the optical head, and information processing apparatus including the optical disc apparatus - An optical head is used to irradiate a beam onto an optical recording medium having multiple recording positions in the thickness direction, and to receive a reflection beam reflected from the recording medium. The optical head has a light source, an optical system, and a detector. The optical system transmits the irradiation beam from the light source to the recording positions of the medium, separates optical components based on wavelength, and transmits the components to respective detection positions, where the components are individually detected. | 08-28-2008 |
| 20080205245 | OPTICAL PICKUP APPARATUS - A diffracting portion is disposed in an optical path between a light source and an optical disc. The diffracting portion diffracts the reflected light from recording layers of the optical disc toward a light receiving portion. The diffracting portion includes a first diffraction region having a first diffraction efficiency and a second diffraction region having a second diffraction efficiency lower than the first diffraction efficiency. The first diffraction region includes a FES diffracting portion and first to fourth TES diffracting portions. The second diffraction region includes fifth and sixth TES diffracting portions. First-order diffraction lights from the non-light-collecting recording layer enter on the fifth and the sixth TES diffracting portions, and are diffracted toward the light receiving portion by the fifth and the sixth TES diffracting portions. | 08-28-2008 |
| 20090092030 | Optical disk device - Provided is an optical disk device to output a reproduction signal to reproduce an optical disk, including: a light output circuit to output light having a high frequency superimposed thereon; a first light receiving circuit to receive the light to output a first voltage corresponding to an amount of the light; a second light receiving circuit to output a second voltage corresponding to an amount of reflected light from the optical disk; an arithmetic circuit to output a calculation result based on a difference between the first voltage and the second voltage; and a reproduction signal generating circuit to control one of the first voltage and the second voltage based on the calculation result to generate the reproduction signal to reproduce the optical disk. | 04-09-2009 |
| 20090097381 | OPTICAL PICKUP AND OPTICAL INFORMATION PROCESSING APPARATUS - A disclosed optical pickup for performing at least recording, reproduction, or deletion of information on a first, second, third, and fourth optical recording media having different recording densities includes a first light source configured to emit first light having a first wavelength λ | 04-16-2009 |
| 20090231982 | OPTICAL PICKUP AND OPTICAL DATA PROCESSING DEVICE USING THE SAME - An optical pickup including a light source, two light focus devices, a light reception device, a polarization selective light path splitting device, a polarization switching device, a first diffraction element including a periodic structure including two kinds of sub-wavelength convexo-concave structures while the two kinds of sub-wavelength convexo-concave structures alternately arranged at right angles to each other, and the filling factors of the two kinds of sub-wavelength convexo-concave structures are determined to substantially equalize effective refractive indices of the two kinds of sub-wavelength convexo-concave structures with regard to the polarization direction of the outgoing light beam, and the second diffraction element having a structure similar to that of the first diffraction element except that the filling factors are determined to substantially equalize effective refractive indices of the two kinds of sub-wavelength convexo-concave structures with regard to a polarization direction perpendicular to the polarization direction of the outgoing light beam. | 09-17-2009 |
| 20090231983 | IMAGE PICKUP APPARATUS FOR CAPTURING SPECTRAL IMAGES OF AN OBJECT AND OBSERVATION SYSTEM INCLUDING THE SAME - An image pickup apparatus has a construction in which a diffraction element is provided in an observation optical system. Zero-order light that is transmitted straight through the diffraction element and one of the +1st-order diffracted light and the −1st-order diffracted light that is diffracted by the diffraction element are imaged onto an image pickup surface of an image pickup apparatus. The imaging areas of the zero-order light and one of the +1st-order diffracted light and the −1st-order diffracted light that is diffracted by the diffraction element do not overlap on the image pickup surface of the image pickup apparatus. With this construction, a small image pickup apparatus that provides a high-resolution spectral image and a color image of an object can be obtained. | 09-17-2009 |
| 20100097919 | OPTICAL PICKUP APPARATUS - Provided is an optical pickup apparatus that can be made compact and is capable of producing stable push-pull signals. The optical pickup apparatus includes a light source, an objective lens, a diffraction element, a light-receiving element, and a control-driving section. The diffraction element receives light reflected from an optical recording medium. The light-receiving element receives light beams diffracted by the diffraction element. The light-receiving element has a plurality of light-receiving regions. The light-receiving region produces an output signal responsive to the quantity of the incident light beam. The control-driving section obtains differences among the output signals from a plurality of the light-receiving regions by calculation to derive a push-pull signal, and drives the objective lens under control on the basis of the push-pull signal. | 04-22-2010 |
| 20100135144 | OPTICAL PICKUP DEVICE AND LENS FOR OPTICAL PICKUP - An optical pickup device according to the present invention comprises: a first mirror for reflecting a first light beam outputted from a first light source and letting a second light beam outputted from a second light source pass therethrough; a first object lens for converging the first light beam reflected by the first mirror on an information recording surface of a recording medium; a second mirror for reflecting the second light beam passing through the first mirror; a second object lens for converging the second light beam reflected by the second mirror on the information recording surface of the recording medium; and an achromatic lens for correcting an axial chromatic aberration of the second object lens generated by wavelength variation of the second light beam, wherein the achromatic lens is provided in an optical path between the first mirror and the second mirror. | 06-03-2010 |
| 20100142355 | OPTICAL HEAD DEVICE AND OPTICAL INFORMATION RECORDING OR REPRODUCING DEVICE - [Problems] To provide an optical head and an optical information recorder/reproducer in which a high signal/noise ratio can be attained for an RF signal. | 06-10-2010 |
| 20100149951 | INFORMATION RECORDING AND REPRODUCING DEVICE - An information recording/reproducing device includes a light source separately projecting laser light for recording or reproducing, an optical system leading the projected laser light to a recording medium, a diffracting element separating laser light into main- and beam sub-beams, an evanescent light generating element irradiating evanescent light in relation to the separated sub-beam to a track where no recording pit is formed, a sub-light receiving element for receiving return light in relation to the sub-beam, a moving element for moving the evanescent light generating element in relation to the sub-beam to a direction to change a gap with the recording surface, and a control element; for controlling the moving element so as to make the gap become a predetermined target value in accordance with a gap error signal containing a signal indicative of a light amount of the return light in relation to the received sub-beam. | 06-17-2010 |
| 20100226235 | OPTICAL PICKUP DEVICE - An optical pickup device radiates laser light to a disc having a plurality of recording layers in a direction of lamination. The optical pickup device includes a laser light source, a collimator lens, and an objective lens. The collimator lens changes a spread angle of the laser light emitted from the laser light source. The objective lens converges the laser light having passed through the collimator lens onto the disc. With the laser light in a parallel state having passed through the collimator lens, if a distance f between the laser light source and the collimator lens and a distance L between the collimator lens and the objective lens are in a relation of f| 09-09-2010 | |
| 20110085432 | GRATING ELEMENT, OPTICAL PICKUP OPTICAL SYSTEM AND METHOD OF DESIGNING GRATING ELEMENT - A grating element is provided with diffraction members wherein protrusions and recesses are periodically arranged, respectively, on one surface of each of transparent substrates. The diffraction members are laminated in the substantially perpendicular direction to the transparent substrates, the protrusions of the diffraction members are made of a dielectric multilayer film, and the dielectric multilayer film has dielectric films of two or more types laminated in the substantially perpendicular direction on the transparent substrates. The wavelengths of laser beams diffracted at predetermined diffraction efficiencies by the diffraction members are different from one another. | 04-14-2011 |
| 20110205879 | OPTICAL PICK-UP DEVICE AND METHOD FOR MANUFACTURING THE SAME - Provided are an optical pick-up device which can appropriately correct an optical path of a laser beam emitted from a light-emitting chip arranged with a mounting error, and a method of manufacturing the same. An optical pick-up device includes: a first light-emitting chip and a second light-emitting chip which emit laser beams having predetermined wavelengths; a PDIC which receives the laser beams emitted from the first and the second light-emitting chips; and a first optical correction component and a second optical correction component provided between the PDIC and the light-emitting chips. The first and the second optical correction components incline a first laser beam by diffraction, while transmitting a second laser beam and a third laser beam without inclining these beams. With the diffraction of the first laser beam by these two correction components, the optical path of the first laser beam is corrected to a predetermined position. | 08-25-2011 |
| 20110228664 | OPTICAL INFORMATION RECORDING/REPRODUCING APPARATUS AND OBJECTIVE OPTICAL SYSTEM FOR THE SAME - An objective optical system for information recording/reproducing, at least one of optical surfaces of the objective optical system comprising a diffraction surface including a first region contributing to converging first, second and third beams and including a diffraction structure formed such that use diffraction orders for the first, second and third beams are 1st-orders and a condition 0.03<(λB | 09-22-2011 |
| 20120075978 | Objective Lens Element and Optical Pickup Device - An objective lens element that can suppress occurrence of an aberration is disclosed. Sawtooth-like diffraction structures having different height and cycles (pitches) are provided on an inner part R | 03-29-2012 |
| 20120155241 | OPTICAL PICKUP APPARATUS AND OBJECTIVE OPTICAL UNIT - An optical pickup apparatus includes: a first light source for emitting a first light flux; a second light source for emitting a second light flux; a third light source for emitting a third light flux; and an objective optical unit having a first optical path difference providing structure and a second optical path difference providing structure. Magnifications of the objective optical unit for the first-third light fluxes have almost same value. The first optical path difference providing structure provides a predefined optical path difference and changes a spherical aberration to be one of under-correction and over-correction for all of the first light flux, the second light flux, and the third light flux. The second optical path difference providing structure provides a predefined optical path difference and changes a spherical aberration to be the other of under-correction and over-correction of the spherical aberration only for the second light flux. | 06-21-2012 |
| 20140313874 | OPTICAL HEAD DEVICE AND OPTICAL DISC DEVICE - An optical component, a hologram, and a photodetector are configured in an optical head device of an optical disc device such that a +1-order beam or a −1-order beam of diffracted light generated from light reflected from an information track in the intended information recording layer strikes the interior of the light-receiving surfaces of the tracking error detection light-receiving sections, a +1-order beam or a −1-order beam of diffracted light generated from light reflected from an information track in an information recording layer one layer deeper than the intended information recording layer strikes outside the light-receiving sections, and a +1-order beam or a −1-order beam of diffracted light that is generated from light reflected from an information track in an information recording layer one layer shallower than the intended information recording layer strikes outside the light-receiving sections. | 10-23-2014 |
