Patent EP0099576A2 successfully refreshed from Google Patents.
EP0099576A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical information processor
Assignee: Hitachi Ltd
•
Filing: 1983-07-20
•
Granted: —
•
Expires: 2003-07-20
Abstract
Abstract This invention discloses an optical information processor which comprises: a recording medium (76) equipped with mirror areas disposed equidistantly inside an information track (77) recorded by a light beam; a light detector (78, 79) receiving the diffraction light from the information track by the light beam; first signal detecting means (81, 82, 82', 83, 84, 85) differentially operating the signals from the light detector and generating a tracking signal tracking the information track; and second signal detecting means (80, 85) detecting the signal from the mirror areas of the tracking signal; wherein offset in the tracking signal is removed by use of the signal from the second signal detecting means.
Inventors
- 👤 Toshimitsu Kaku
- 👤 Yoshito Tsunoda
- 👤 Takeshi Maeda
- 👤 Shigeru Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 22:07
CPC Classifications
G; G11; G11B; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B20/00; G11B20/10; G11B20/10009; G11B20/10046; G11B20/10203; G11B7/00; G11B7/007; G11B7/00745; G11B7/08; G11B7/09; G11B7/094; G11B7/095; G11B7/0956; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2537
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
125 words
An optical information processor characterized by a recording medium (76) equipped with mirror areas (63) for reflecting light spot as such, said mirror areas being disposed in a track (77) for optically recording and reproducing predetermined information; a light detector (79) having two light receiving portions for receiving diffraction light from said track; first means (80) differentially processing the signals from said light receiving portions of said light detector and providing a tracking signal for tracking said track; second means (81) detecting signals generated from said reflecting area in said tracking signal; and third means (85) differentially processing the output from said first means and the output from said second means; wherein said light spot tracks said track by the output of said third means.
Claim 2
Dependent Claim
125 words
An optical information processor characterized by a recording medium (76) equipped with mirror areas (63) for reflecting light spot as such, said mirror areas being disposed in a track (77) for optically recording and reproducing predetermined information; a light detector (79) having two light receiving portions for receiving diffraction light from said track; first means (80) differentially processing the signals from said light receiving portions of said light detector and providing a tracking signal for tracking said track; second means (81) detecting signals generated from said reflecting area in said tracking signal; and third means (85) differentially processing the output from said first means and the output from said second means; wherein said light spot tracks said track by the output of said third means.
Claim 3
Dependent Claim
186 words
In an optical information processor comprising: an optical information recording medium having a track consisting of a sector portion and an information recording portion; a light detector having two light receiving portions receiving the diffraction light generated when a light beam from a light source is radiated to said recording medium; first means differentially processing the signals from said light receiving portions of said light detector and providing a tracking signal tracking said information track; and second means cumulating the signals from said light receiving portions of said light detector to obtain an information signal from said track; the improvement characterized in that said track (77) having mirror areas (63) for reflecting the light beam as such on said information recording portion; third means (81, 82, 82') detecting a signal representing said sector portion (64) from said information signal; fourth means (84) holding said tracking signal by the output of said third means; and fifth means (85) obtaining the difference between the output of said fourth means and said tracking signal; said light beam tracking said track by means of the output of said fifth means.
Claim 4
Dependent Claim
186 words
In an optical information processor comprising: an optical information recording medium having a track consisting of a sector portion and an information recording portion; a light detector having two light receiving portions receiving the diffraction light generated when a light beam from a light source is radiated to said recording medium; first means differentially processing the signals from said light receiving portions of said light detector and providing a tracking signal tracking said information track; and second means cumulating the signals from said light receiving portions of said light detector to obtain an information signal from said track; the improvement characterized in that said track (77) having mirror areas (63) for reflecting the light beam as such on said information recording portion; third means (81, 82, 82') detecting a signal representing said sector portion (64) from said information signal; fourth means (84) holding said tracking signal by the output of said third means; and fifth means (85) obtaining the difference between the output of said fourth means and said tracking signal; said light beam tracking said track by means of the output of said fifth means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.