Rotating recorder with dual encoder arrangement having...

Details Rotating recorder with dual encoder arrangement having... Rotating recorder with dual encoder arrangement having...

2007-11-20

2007-11-20

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

Reexamination Certificate

active

10921276

ABSTRACT:
A rotating recording device, such as an electron beam recorder, is provided with a dual encoder arrangement. A first encoder is employed as a spindle motor controller and located at a first end of a spindle. A second encoder is mounted at a turntable adjacent to a recording surface and used as a position, velocity or clock source for recording the pattern on the substrate. Eccentricity of the mounting of the second encoder is measured against the more accurately mounted spindle control encoder and compensated by a digital clock generating system using a digital phase locked loop.

REFERENCES:
patent: 6414916 (2002-07-01), Kojima
patent: 2004/0001415 (2004-01-01), Formato et al.
patent: 2004/0021976 (2004-02-01), Deeman et al.

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