Method for determining variations from flatness in the topograph

Details Method for determining variations from flatness in the topograph Method for determining variations from flatness in the topograph

1983-07-29

1986-07-22

Faber, Alan

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 53, G11B 2736

Patent

active

046023593

ABSTRACT:
A method is provided for determining the magnitude of flatness deviation in high density information discs, such as video discs, manifesting irregularities in playback. Such flatness deviations are known as "orange-peel." A stylus riding over a relatively large area (4-5 grooves) of the disc surface provides a vertical velocity signal within a given spatial or temporal frequency band. The signal in velocity or displacement form is the quantitative measure of deviation. The method is useful for other type discs where quantitative measurements in flatness deviation are desired.

REFERENCES:
patent: 3830505 (1974-08-01), Rabinow
patent: 3842194 (1976-10-01), Clemens
patent: 3872241 (1975-03-01), Adler
patent: 4044379 (1977-08-01), Halter
patent: 4325134 (1982-04-01), Langley
patent: 4410970 (1983-10-01), Law
patent: 4481616 (1984-11-01), Matey
patent: 4541716 (1985-09-01), Crooks

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