Patent
Optical reading and writing device
TLDR
In this paper, the relative tilt of an optical disk and a movable objective lens holder is measured as an output of a differential amplifier which subtracts an output from first photodetectors and detects the reflected light from optical disk from output of second photodeter.Abstract:
The relative tilt of an optical disk and a movable objective lens holder is measured as an output of a differential amplifier which subtracts an output of first photodetectors and which detect the reflected light from optical disk from an output of second photodetectors and which detect the reflected light from a reflector mounted on movable objective lens holder. The signal from differential amplifier is used to tilt movable objective lens holder so that the movable objective lens holder compensates the tilt of optical disk.read more
Citations
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Patent
Optical pickup apparatus of tilt control type
TL;DR: In this paper, an optical pickup apparatus for tilt control of an objective lens with ease is described, which consists of a lens holding cylinder, wires and elastic tilt members for elastically supporting the holding cylinder so that it can be moved.
Patent
Tilt servo apparatus for use in optical disc reproducing apparatus
TL;DR: A tilt servo is used in an optical disc reproducing apparatus having an optical pickup including a liquid crystal panel for an aberration correction on which a transparent electrode is formed and divided into segments of predetermined shapes as discussed by the authors.
Patent
Information reproducing apparatus having function of detecting inclination of manual scan type handy reading device and correcting adverse effects arising from the inclination
TL;DR: In this article, a pen type reading device for manually reading the multimedia information recorded to be capable of being optically read is not scanned perpendicularly to a sheet but is scanned at an inclination angle with respect thereto.
Patent
Optical disk having an evaluation pattern for evaluating the optical disk
Fujimoto Sadanari,Hiroharu Satoh +1 more
TL;DR: In this paper, a test pattern data is reproduced by a reproducing system to detect an error rate, a compensation coefficient for minimizing the error rate is acquired, and a reproduction signal is compensated by using this compensation coefficient so that the reproduction signals are reproduced with the minimized error rate.
Patent
Optical recording medium, tilt detector, optical disk drive, tilt detecting method, and tilt correcting method
Akihiro Itakura,Michio Matsuura +1 more
TL;DR: A tilt detector and tilt detecting method of detecting a tilt amount by using a tracking error signal, for example, a push-pull signal, obtained from the difference in quantities of light received by a photo detector halved in a direction vertical to the track direction, and correcting an error of tilt amount detected by the imbalance of the light beam on the mirror surface.
References
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Patent
Optical information reading apparatus
TL;DR: In this article, a light-emitting element and a lightdetecting element are used to detect the offset in perpendicularity between the optical axis of the reading light beam and the recording surface.
Patent
Optical disk device
TL;DR: In this paper, the authors propose to transfer a file at high speed with no waiting time for a data concerned by shifting rotary phases from each other on a medium from which the data is transferred and a medium to which the transferred by a delay time attending upon the data transfer.
Patent
Optical information reproducing apparatus with tilt correction including projection and detection of a same diffusely illuminated field
TL;DR: In this paper, an optical information reproducing apparatus for reproducing an information recorded on a recording surface of a disc-shaped record medium is presented, which includes an optical pick up device mounted on a tiltable optical block and having a laser beam source and a photo detector for detecting the reflected beam from the recording surface and reading the recorded information.
Patent
Objective driving device for an optical disk apparatus
Hiroshi Kokado,Suguru Takishima,Koichiro Nishikawa,Takeda Junichi,Masahiko Sasaki,Isao Okuda,Hiroshi Yamamoto,Masami Ninomiya,Akihiro Tanaka,Hiroshi Motohashi,Makoto Iwaki,Kubo Wataru +11 more
TL;DR: In this article, an optical disk apparatus consisting of an optical pickup having an optical body carrying a laser and a photodetector responsive to light emitted from the laser and reflected by the optical disk for producing tracking error signals mounted on the optical pickup body for reciprocal movement in a tracking direction responsive to operation of an actuator.
Patent
Optical head apparatus for maintaining a constant angle between an optical axis of an object lens and the surface of a storage medium
TL;DR: An optical head apparatus contains two pairs of coils, paired off in one of a first direction and second direction perpendicular to the first direction, and are energized independently of one another.