EP0355620A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Optical card
Assignee: Omron Corp
•
Filing: 1989-08-11
•
Granted: —
•
Expires: 2009-08-11
Abstract
Abstract There is provided a WORM type optical card in which different from a data area including tracks to which a plurality of kinds of data are recorded, a directory area including a track to which directory data indicative of a reading position of each kind of data recorded in the data area is recorded is provided.
Inventors
- 👤 Yasuhiko Omron Tateisi Electronics Co. Oki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 04:07
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/007; G11B7/00736; G11B27/00; G11B27/02; G11B27/031; G11B27/10; G11B27/19; G11B27/28; G11B27/32; G11B27/327; G11B27/34; G11B7/002; G11B7/0033; G11B20/00; G11B20/10; G11B20/12; G11B20/1215; G11B2220/00; G11B2220/20; G11B2220/21; G11B2220/215; G11B2220/218
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
52 words
A WORM type optical card, wherein different from a data area including tracks to which a plurality of kinds of data are recorded, a directory area including a track to which directory data indicative of a reading position of each kind of data recorded in said data area is recorded is provided.
Claim 2
Dependent Claim
52 words
A WORM type optical card, wherein different from a data area including tracks to which a plurality of kinds of data are recorded, a directory area including a track to which directory data indicative of a reading position of each kind of data recorded in said data area is recorded is provided.
Claim 3
Independent Claim
133 words
A method of writing data to an optical card having a data area including a plurality of tracks and a directory area including a plurality of tracks, comprising the steps of: searching the latest track in which latest directory data has been recorded in said directory area and reading out the latest directory data from said searched latest track; determining a track to which new data is to be written in said data area on the basis of the readout latest directory data; writing the new data to the determined track; and writing new directory data which is obtained by adding directory data relating to said written new data to the directory data which was read out of the latest track to the next track of said latest track in the directory area.
Claim 4
Independent Claim
133 words
A method of writing data to an optical card having a data area including a plurality of tracks and a directory area including a plurality of tracks, comprising the steps of: searching the latest track in which latest directory data has been recorded in said directory area and reading out the latest directory data from said searched latest track; determining a track to which new data is to be written in said data area on the basis of the readout latest directory data; writing the new data to the determined track; and writing new directory data which is obtained by adding directory data relating to said written new data to the directory data which was read out of the latest track to the next track of said latest track in the directory area.
Claim 5
Independent Claim
98 words
A method of reading data from an optical card having a data area including a plurality of tracks and a directory area including a plurality of tracks, comprising the steps of: searching the latest track in which latest directory data has been recorded in said directory area and reading out directory data from said searched latest track; determining a track position at which objective data has been recorded in said data area on the basis of the directory data which was read out of said latest track; and reading out the data recorded on said determined track therefrom.
Claim 6
Independent Claim
98 words
A method of reading data from an optical card having a data area including a plurality of tracks and a directory area including a plurality of tracks, comprising the steps of: searching the latest track in which latest directory data has been recorded in said directory area and reading out directory data from said searched latest track; determining a track position at which objective data has been recorded in said data area on the basis of the directory data which was read out of said latest track; and reading out the data recorded on said determined track therefrom.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.