US Patent No: 6,147,941
Number of patents in Portfolio can not be more than 2000
Optical disc device and optical disc discriminating method
Stats
-
Nov 14, 2000
Issued date -
Jan 7, 1998
filing date -
09/003,933
serial no -
In Force
status
Importance
Loading Importance Indicators...
Abstract
An optical disc device includes a laser light source for radiating a laser light beam illuminated via an objective lens on a signal surface of an optical disc, a return light detection unit for detecting the reflected light radiated from the laser light source and reflected from the signal surface of the optical disc, a disc discriminating unit for discriminating the type of the optical disc based on a detection output of the return light detection unit, a unit for detecting tracking error signals of plural different types of different detection systems based on the detection output of the return light detection unit, a tracking unit for displacing the objective lens along the radius of the optical disc responsive to the tracking error signals for tracking-controlling a laser spot of the laser light focussed on the signal surface of the optical disc and a controlling unit for switching the detection system based on a discriminating output by the disc discriminating unit for selecting one of the plural types of the tracking error signals responsive to the types of the optical discs.
Loading the Abstract Image...
First Claim
Related Publications
Loading Related Publications...
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
|
|
|||
| 5,636,196 Optical disc apparatus with selectively shiftable seek operation capture range | 13 | 1995 | |
| 5,703,852 Optical disk reproducing apparatus having a cosine equalizer with boosted frequency characteristics | 16 | 1996 | |
|
|
|||
| 5,592,448 Access control apparatus for optical disk according change of track pitch | 17 | 1995 | |
|
|
|||
| 5,724,325 Method for reducing lead in time in an optical disk recording or reproducing apparatus capable of processing data for multiple types of disks | 29 | 1996 | |