Information recording medium

• US 4,811,321 A
• Filed: 06/20/1988
• Issued: 03/07/1989
• Est. Priority Date: 02/20/1985
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Enari, Masahiko, Aoki, Akio, Hosoya, Hideki
• Primary Examiner(s): Canney, Vincent P.
• Application Number:
  US07/208,802
• Time in Patent Office: 260 Days
• Field of Search: 369/59, 360/49
• US Class Current: 369/59.25
• CPC Class Codes: G11B 20/1215 on cards optical aspect of optical cards G11B7/0033
• CPC Class Codes: G11B 20/1426 conversion to or from block codes or representations thereof
• CPC Class Codes: G11B 7/0033 with cards or other card-like flat carriers, e.g. flat sheets of optical film
• CPC Class Codes: G11B 7/00745 Sectoring or header formats within a track formats in general G11B20/12

Abstract

An information recording medium includes: a plurality of information tracks for storing information to be recorded; a first area for separating and discriminating an information track from another information track adjacent to the information track in the direction of information sequence; and a second area for separating and discriminating the information track from another information track adjacent to the information track in the direction perpendicular to the direction of information sequence, the second area having a common portion to the first area.

Claims

1. An optical card having a recording area on a card-shaped recording medium, comprising:

a plurality of information tracks for storing information to be recorded, said tracks being arranged in a direction of information sequence and a direction perpendicular thereto, said tracks arranged in the direction perpendicular to the information sequence direction forming a band, and a plurality of said bands being formed in the information sequence direction; and

an area for separating and discriminating said information tracks from one another in respect of said two directions, said area being formed between the adjacent bands and constructed of a plurality of tracks arranged in the direction perpendicular to the information sequence direction, each of said tracks in said area one-to-one corresponding to each of said information tracks in the band adjacent to said area and containing a code not included in any of said information tracks, and said code being inverted in its content alternately between the adjacent tracks in said area.

2. An information recording medium comprising:

a plurality of information recording tracks for storing information to be stored, said information recording tracks being arranged in a direction of information sequence and a direction perpendicular thereto; and

an area for separating and discriminating said information recording tracks from one another with respect to said two directions, said area being composed of predetermined pattern including a consecutive pattern other than that to be recorded in said information recording tracks and said predetermined pattern being alternately reversed in the arrangement direction thereof.

3. An information recording medium according to claim 2, wherein said predetermined pattern is alternately reversed to another predetermined pattern adjacent to said predetermined pattern in said direction of said information sequence.

4. An information recording medium according to claim 2, wherein said information recording tracks have an area indicating a track number, said area indicating said track number and said area for separating and discriminating being commonized.

5. An information recording medium comprising:

a plurality of information recording tracks for storing information to be stored in information pattern obtained by converting predetermined information by use of predetermined converting process being recorded in said information recording tracks and said information recording tracks being arranged into a direction of information pattern sequence and a direction perpendicular thereto; and

an area for separating and discriminating said information recording tracks from one another with respect to said two directions, said area including a plurality of predetermined patterns arranged in said perpendicular direction and unable to be obtained by said predetermined converting process and said plurality of predetermined patterns being different from another pattern adjacent to said predetermined pattern in a direction of predetermined pattern arrangement.

6. An information recording medium according to claim 5, wherein said plural information recording tracks adjacent to each other in said perpendicular direction form a band and said area is positioned between said plural bands arranged in said direction of said information pattern sequence so as to separate the bands.

7. An information recording medium according to claim 6, wherein said separation and discrimination of said information recording tracks in said bands can be attained by making said predetermined pattern different from said another pattern adjacent to said predetermined pattern in said direction of said predetermined arrangement.