EP0178116A2
Expired / Lapsed
EP
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Optical memory element
Assignee: Sharp Corp
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Filing: 1985-10-01
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Granted: —
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Expires: 2005-10-01
Abstract
Abstract An optical memory element includes a guide track groove portion (12) and address signal pit portion (13) for indicating the address of the guide track groove. The address signal pit portion has a pit width (t1) narrower than the groove width (t2) of the guide track groove portion.
Inventors
- 👤 Kneji Ohta
- 👤 Tetuya Inui
- 👤 Yoshikazu Fujii
- 👤 Toshihisa Daiya Haitsu Gakuenmae C-722 Deguchi
- 👤 Shigemi Maeda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 20:31
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10595; G11B11/10597; G11B11/1055; G11B11/10556; G11B11/10563; G11B11/10565; G11B11/10576; G11B11/10578; G11B11/10582; G11B11/10584; G11B7/00; G11B7/08; G11B7/09; G11B7/0938; G11B7/24; G11B7/2407; G11B7/24085; G11B7/007
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
38 words
An optical memory element comprising guide track grooves and address signal pits for indicating the addresses of said guide track grooves, said address signal pits having a pit width narrower than the width of said guide track grooves.
Claim 2
Dependent Claim
38 words
An optical memory element comprising guide track grooves and address signal pits for indicating the addresses of said guide track grooves, said address signal pits having a pit width narrower than the width of said guide track grooves.
Claim 3
Dependent Claim
47 words
The optical memory element as claimed in claim 1 wherein said guide track grooves and said address signal pits are formed through the application of laser beam, with the laser power for forming said address signal pits being lower than that for forming said guide track grooves.
Claim 4
Dependent Claim
52 words
An optical memory disc comprising: a recording medium; a guide track groove formed on said recording medium; and address signal pits formed on said recording medium, said address signal pits indicating the address of said guide track droove, and having a pit width narrower than the width of said guide track groove.
Claim 5
Dependent Claim
52 words
An optical memory disc comprising: a recording medium; a guide track groove formed on said recording medium; and address signal pits formed on said recording medium, said address signal pits indicating the address of said guide track droove, and having a pit width narrower than the width of said guide track groove.
Claim 6
Dependent Claim
22 words
The optical memory disc of claim 3, wherein said recording medium is an alloy film including rare earth element and transition metal.
Claim 7
Dependent Claim
29 words
An optical memory element having tracks for storing information and, aligned with each track, an address code for that track, the code having a narrower width than the track.
Claim 8
Dependent Claim
29 words
An optical memory element having tracks for storing information and, aligned with each track, an address code for that track, the code having a narrower width than the track.
References Cited (Backward Citations)
No citation records indexed.
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