Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-02-06
1992-03-17
Richardson, Robert L.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
2502015, 369 4441, G11B 700
Patent
active
050974556
ABSTRACT:
A method and apparatus for detecting the focus of a beam of light directed onto grooved optical media, wherein light reflected from said media has a number of orders of reflection forming a sheared interferogram, and wherein overlapping regions are generated between said orders of reflection in said interferogram, is shown to include a light receiving member for receiving light reflected from the media and for directing the light onto a detector member for detecting differences in the brightness of light across the overlapping regions. The detecting member is shown to include, a first photosensitive member for detecting the brightness of light in a portion of the overlap region between the zeroth and first order reflections, a second photosensitive member for detecting the brightness of light in the remainder of the overlap region between the zeroth and first order reflections, and a comparator for comparing the brightness detected between the portion and the remainder of the overlap region.
REFERENCES:
patent: 4764912 (1988-08-01), Ando et al.
Hewlett--Packard Company
Richardson Robert L.
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