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| Application No. | Application Title | Issue Date |
| 20080175110 | OPTICAL HEAD, OPTICAL DISC DRIVE, COMPUTER, OPTICAL DISCPLAYER AND OPTICAL DISC RECORDER When performing a read or write operation on an optical disc with information storage layers, this compatible optical head with a two-focus lens can reduce interference caused by an unnecessary diffracted light reflected from a non-target layer and not contributing to r... | 07/24/2008 |
| 20080117724 | OPTICAL PICKUP AND OPTICAL DISC DEVICE EMPLOYING THE SAME An optical pickup includes: a light source emitting a light beam; an objective lens condensing the light beam emitted from the light source on a recording layer of an optical disc; a photodetector including a photoreception portion receiving the returned light from the ... | 05/22/2008 |
| 20070242575 | Optical Pickup and Optical Disc Apparatus When recording/reproducing an optical disc having a recording layer of multi-layer structure, an unwanted optical beam reflected from a recording layer other than a target layer for recording/reproduction is incident on a photodetector to cause an unwanted disturbance c... | 10/18/2007 |
| 20070206451 | OPTICAL PICKUP AND OPTICAL DISC APPARATUS An optical pickup for recording or reproducing an information signal in an optical disc includes a light source for emitting a light beam toward the optical disc, an objective lens for focusing the light beam emitted from the light source onto a recording surface of the... | 09/06/2007 |
| 20070201324 | OPTICAL-PICKUP HEAD DEVICE, AND METHOD AND APPARATUS FOR REPRODUCING OPTICAL STORAGE MEDIUM A light source outputs an optical beam. A condensing unit condenses the optical beam to a first information-recording layer. An optical detecting unit detects a reflected optical beam reflected from the optical storage medium. A limiting element inputs a first reflected... | 08/30/2007 |
| 20070025205 | Optical pickup and optical recording and/or reproducing apparatus employing the same An optical pickup, including a light source, an objective lens to focus light emitted from the light source to form a light spot on an optical information storage medium, an optical path changer to change an optical path of the light, a photodetector to receive light re... | 02/01/2007 |
| 20060233081 | Optical pickup device An optical pickup device using a laser beam comprising: a light-emitting element; a collimating lens; an objective lens; and a light-receiving element, wherein the laser beam emitted from the light-emitting element is converged on a recording surface of an optical disc ... | 10/19/2006 |
| 20060077795 | Objective optical system for optical recording media and optical pickup device using it An objective optical system for focusing light from a light source onto optical recording media includes an aperture control filter with a diffractive optical function formed as a glass plate with an aperture control structure on one side and a diffractive optical struc... | 04/13/2006 |
| 20050270955 | Optical pickup unit and information recording and reproduction apparatus 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 reflected from the information recording medium, and a light blocking pa... | 12/08/2005 |
| 20050265206 | Optical disc reproducing device and optical disc reproducing method As an aperture diaphragm of an optical disc, the aperture diaphragm in which an aperture differs for a first and a second wavelength, and the aperture in a radial direction of the optical disc at the second wavelength is smaller than the aperture in a circumferential di... | 12/01/2005 |
| 20050018554 | Optical head apparatus The present invention proposes an optical head apparatus provided with light-blocking structure that can reliably prevent nonessential light from reaching the photo detector, without being an impediment to miniaturization and flattening, moreover, without increasing man... | 01/27/2005 |
