Patent
Optical pickup device
Onishi Seiji,Tetsu Tanaka +1 more
TLDR
In this article, a simplified optical pickup device is proposed to secure sufficient quantity of converged light required for recording and reproducing onto/from respective optical disks, can obtain required imaging magnification of respective optical systems, and does not generate performance degradation at lens shift, when recording or reproduction is performed on/from optical disks with different base material thickness by plural optical systems.Abstract:
The present invention has for its object to provide a compact and simplified optical pickup device which secures sufficient quantity of converged light required for recording and reproducing onto/from respective optical disks, can obtain required imaging magnification of respective optical systems, and does not generate performance degradation at lens shift, when recording or reproduction is performed onto/from optical disks with different base material thickness by plural optical systems of a single optical pickup device. A first light source and second light source which emit light beams with different wavelength corresponding to plural kinds of optical information recording media, a beam splitter as a synthesizing means, a collimator lens as an optical converting means, and an objective lens as a converging means are equipped, and a light path length converting means such as a prism mirror, which is made of material having high refractive index, for lengthening light path length (air reduction length) is provided between the synthesizing means and the converging means in a state where the first light source is located nearer to the optical converting means than a back focus thereof is and the second light source is located farther from the optical converting means than a back focus thereof is, thereby to making the synthesizing means close to the converging means.read more
Citations
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Patent
Optical pickup device
TL;DR: In this article, an optical pickup device has a first combination reception and emission device (1) which emits laser beams (2) to an optical disk, and a second combination reception-and-emitting device (3) having a wavelength different from that of the laser beam (4) to the disk.
Patent
Optical pickup device and optical disk drive using the same
TL;DR: An optical pickup device as mentioned in this paper is an optical system which leads a return light beam to a predetermined light-receiving location and includes an object lens focusing each light beam from the light source unit to a recording surface of a corresponding storage medium and a photodetector arranged at the light receiving location.
Patent
Optical pickup device
TL;DR: In this article, an optical pickup device using a laser beam consisting of a light-emitting element, a collimating lens, an objective lens, and a light receiving element is described.
Patent
Optical pickup device and recording medium used therefor
TL;DR: In this paper, a light unit is used to irradiate a light beam having a wavelength longer than 650 nm onto a recording medium and receiving and detecting a lightbeam reflected by the recording medium, and an objective tens is formed of a single lens having an NA of 0.7 or more to form a light spot on the record medium by condensing an incident light beam emitted from the light unit.
Patent
Pick-up head assembly for optical disc employing electrically tunable liquid crystal lens
TL;DR: In this paper, a hybrid pick-up head assembly is used to detect errors in the focus of the pickup head and the tracking, and adjust the focus by modifying the electrical signals applied to the LCD lens, and move the pick up head in the plane of the disc to address the appropriate track.
References
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Patent
Optical head and optical data recording and reproducing apparatus having the same
TL;DR: An optical head for reproducing data from first and second optical disks which are different from each other in at least one of a base material thickness and an available wavelength, includes: a first light source for emitting a first-light beam, the first light beam being used for replicating data from the first optical disk.
Patent
Light beam shaping device to change an anisotropic beam to an isotropic beam for reducing the size of an optical head
TL;DR: In this article, an optical head device adapted to be optically coupled to an optical disk includes a light-source laser and an objective lens, which receives an output light of the light source, and causes it to be projected onto the optical disk to form a focused spot thereon.
Patent
Optical pickup device
Sato Katsutoshi,Numata Mutsumi +1 more
TL;DR: In this article, a three-spot system was proposed to detect the tracking error signal by a three spot system. But it was not shown how to obtain a stable track follow-up characteristic by preventing the decrease of the gain of a tracking signal even if a sliding base and the arm of a biaxial driving section are extended by a temp rise.
Patent
Optical system of optical pick-up
TL;DR: In this article, an optical system of an optical pick-up for recording/reproducing data to/from at least two types of optical discs including a first optical disc and a second optical disc whose recording density is higher than that of the first one.