Disc attitude variation detecting apparatus

Details Disc attitude variation detecting apparatus Disc attitude variation detecting apparatus

1987-09-25

1989-07-18

McElheny, Jr., Donald

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369118, G11B 7095

Patent

active

048499544

ABSTRACT:
A disc variation detecting apparatus comprises a light-sensitive element which faces the disc and is positioned together with a light-emitting element in a tangential direction of tracks on the disc. In this configuration, the following relationship is satisfied; d/L.ltoreq..beta./.alpha., where d is a width of a spot of the light beam in its displacement direction formed on the light-sensitive element, L is a length of the light-sensitive element in the displacement direction, .alpha. is an angular variation of the disc corrsponding to the length L, and .beta. is an allowable error angle range upon attitude control of a pickup.

REFERENCES:
patent: 4253723 (1981-03-01), Kojima et al.
patent: 4486791 (1984-12-01), Wada et al.
patent: 4607357 (1986-08-01), Okano
patent: 4636628 (1987-01-01), Tsukai
patent: 4661943 (1987-04-01), Ikeda
patent: 4674078 (1987-06-01), Otsuka et al.

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