Information recording medium with track group indicators

• US 4,982,075 A
• Filed: 12/29/1989
• Issued: 01/01/1991
• Est. Priority Date: 03/14/1985
• 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): Levy, Stuart S.
• Assistant Examiner(s): Nguyen, Hoa
• Application Number:
  US07/462,876
• Time in Patent Office: 368 Days
• Field of Search: 235/470, 235/456, 235/487, 235/494, 235/454, 369/275.3, 365/234, 365/215
• US Class Current: 235/470
• 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
• CPC Class Codes: G11B 7/08505 Methods for track change, selection or preliminary positioning by moving the head

Abstract

An information recording medium comprises a plurality of record bands each having a plurality of information recording tracks arranged orthogonally to a direction of the track, and the record bands are arranged orthogonally to a direction of arrangement of the tracks. Identification fields are provided in the respective bands to allow identification of track groups.

Claims

1. An information recording medium comprising:

a plurality of bands arranged in a first direction, each of said bands being constituted by a plurality of information tracks arranged in a second direction perpendicular to the first direction and separated into a plurality of track groups in each of said bands, said plurality of bands being respectively separated along the first direction; and

an identification field in said bands, said identification field being arranged between said plurality of track groups in such a manner that said plurality of track groups are separated in said second direction.

4. An information recording medium according to claim 1, wherein information is recorded in said information tracks by use of a predetermined modulation process, and wherein said identification field includes a pattern other than that which is generated by said predetermined modulation process, said pattern being information for indicating said identification field.

2. An information recording medium comprising:

a plurality of bands arranged in a first direction, each of said bands being constituted by a plurality of information tracks having at least a track number field and a data information field, said information tracks being arranged in a second direction perpendicular to said first direction and separated into a plurality of track groups in each of said bands, said plurality of bands being respectively separated along the first direction; and

an identification field in said bands, said identification field being arranged in such a manner that said plural track groups are separated in said second direction,

wherein said track groups are constituted by tracks numbering no more than 2ⁿ, where n is the number of bits of each of said track number fields.

3. An information recording medium comprising:

a plurality of bands arranged in a first direction, each of said bands being constituted by plural information track groups arranged in a second direction perpendicular to said first direction in said bands, said plurality of bands being respectively separated along the first direction; and

an identification field for identifying said track groups from those adjacent to said track groups in said bands,

wherein said track groups are constituted by information tracks numbering no more than 2ⁿ and each of said information tracks has a track number field constituted by n bits, n being a positive integer.