G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.1
G11B 7/00 (2006.01) G11B 11/05 (2006.01) G11B 19/20 (2006.01) G11B 21/04 (2006.01) G11B 21/08 (2006.01) G11B 21/12 (2006.01) G11B 27/28 (2006.01)
Patent
CA 1177954
ABSTRACT OF THE DISCLOSURE A rotary recording medium, at least one surface of which has a spiral main track comprising a multiplicity of successively adjacent track turns, and a reference signal track disposed between center lines of mutually adjacent track turns of the main track, the surface of the rotary recording medium comprises at least one information part comprising track turns of the main track having an information signal recorded thereon, first and second reference signals being alternately recorded in the radial direction of the rotary recording medium on the reference signal track, a third reference signal being recorded at positions where track turn numbers change for every revolution of the rotary recording medium, and at least one predetermined region in which one of the first, second, and third reference signals is recorded with an existence period longer than that at other normal regions, for one track turn.
397081
Hirata Atsumi
Takahashi Nobuaki
Marks & Clerk
Victor Company Of Japan Ltd.
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