Tilt servo apparatus for use in ROM system

Details Tilt servo apparatus for use in ROM system Tilt servo apparatus for use in ROM system

2006-04-11

2006-04-11

Robinson, Mark A. (Department: 2872)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C369S044320

Reexamination Certificate

active

07027196

ABSTRACT:
A tilt servo apparatus for use in a ROM system includes means for generating a reconstructing beam to be projected onto a digital storage medium to generate a reflected beam; a holographic plate for storing a first and a second hologram and diffracting the reflected beam with the first and the second hologram to generate a first and a second holographic diffracted beam, respectively; a first and a second detector for generating a first and a second detected signal by detecting the first and the second holographic diffracted beam, respectively; means for generating a tilt servo signal based on the first and the second detected signal; and means for compensating a tilt error of the digital storage medium by using the tilt servo signal.

REFERENCES:
patent: 4478480 (1984-10-01), Doggett
patent: 6661769 (2003-12-01), Kadowaki et al.
patent: 2003/0198158 (2003-10-01), Roh et al.
patent: 1 282 119 (2003-02-01), None

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