Holographic ROM reader having servo control

Details Holographic ROM reader having servo control Holographic ROM reader having servo control

2007-04-17

2007-04-17

Crosland, Donnie L. (Department: 2612)

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

C359S003000, C369S043000, C369S044370, C369S103000, C369S112100, C369S112150, C365S125000

Reexamination Certificate

active

11114017

ABSTRACT:
A holographic ROM reader having a servo control is disclosed. The holographic ROM reader includes an objective lens for focusing light reflected from a storage medium, a pinhole plate provided with a pinhole, a diffraction grating, embedded into the pinhole of the pinhole plate, for diffracting the light focused by the objective lens to produce 0thorder diffracted light, +1storder diffracted light and −1storder diffracted light therethrough, a photo detector for detecting the amounts of the 0thorder, the +1storder and the −1storder diffracted light, and a servo controller for comparing an amount of light of an overlapped area of the 0thorder diffracted light and the +1storder diffracted light with an amount of light of an overlapped area of the 0thorder diffracted light and the −1storder diffracted light to control the position of the objective lens to pass the light through a center of the diffraction grating if the amounts of light are not identical to each other.

REFERENCES:
patent: 6373793 (2002-04-01), Sasaki et al.
patent: 6987615 (2006-01-01), Shiono et al.
patent: 2004/0212859 (2004-10-01), Tsukagoshi
patent: 10-2004-0025921 (2004-03-01), None
patent: 10-2004-0047525 (2004-06-01), None

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