Measuring and testing – Miscellaneous
Patent
1992-03-18
1992-10-27
Raevis, Robert
Measuring and testing
Miscellaneous
360 7314, 242186, G11B 1552
Patent
active
051579715
ABSTRACT:
A method of detecting a tape thickness d and/or a winding diameter Rs of a successive magnetic tape wound on first and second reels therebetween comprising determining a first rotational number C.sub.1 of the first reel indicating variation in a winding number of the magnetic tape on the first reel and a second rotational number C.sub.2 of the second reel indicating variation in a winding number of the magnetic tape on the second reel and a winding radii of the first and second reels reel being Ro and Rs, respectively, when the first and second rotational numbers C.sub.1 and C.sub.2 are zero, while the magnetic tape is being transferred between a first winding state at which the first and second rotational numbers C.sub.1 and C.sub.2 are C.sub.1 a and C.sub.2 a and a second winding state at which the first and second rotational numbers C.sub.1 and C.sub.2 are C.sub.1 b and C.sub.2 b, determining the tape thickness d from an expression (1);
REFERENCES:
patent: 4738950 (1988-04-01), Goker et al.
patent: 4977466 (1990-12-01), Nakata
patent: 4985786 (1991-01-01), Arai et al.
patent: 5085379 (1992-02-01), Uchikoshi et al.
Nakamichi Corporation
Raevis Robert
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