Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2006-08-23
2009-11-10
Edun, Muhammad N. (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044280, C369S112030, C369S112270
Reexamination Certificate
active
07616531
ABSTRACT:
In an integrated optical unit of the present invention, a photo detector (12) and a holding member (17) that sustains a semiconductor laser (11) are provided on a polarizing beam splitter (14). This makes it possible to reduce a deviation from a designed value due to tolerance, and adjust a relative positional relationship between the semiconductor laser (11) and the photo detector (12). Therefore, returned light from an optical disk (4) is accurately adjusted with respect to a division line of a photo-detecting device (13). As a result, stable servo-control is realized, and an information signal with fine quality is obtained.
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Horiyama Makoto
Ogawa Masaru
Conlin David G.
Edun Muhammad N.
Edwards Angell Palmer & & Dodge LLP
Jensen Steven M.
Sharp Kabushiki Kaisha
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