Writing beam focus monitor

Details Writing beam focus monitor Writing beam focus monitor

1982-09-07

1985-02-12

Richardson, Robert L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

358342, G11B 700

Patent

active

044995695

ABSTRACT:
A method and apparatus for monitoring the focus condition of a writing light beam impinging the writing surface of a recording medium. The present invention operates on the recognition of the fact that light from a laser is very slightly divergent as it emerges from the laser. Accordingly, the reflected light from the medium is convergent as it passes in the reverse direction and it forms a real image of the source plane wave. The image is compared to a reference image indicative of proper focus, and the focus is adjusted until the image matches the reference image.

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