Optical element, optical head and optical information processor

Details Optical element, optical head and optical information processor Optical element, optical head and optical information processor

2005-08-09

2005-08-09

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S23700G, C250S225000, C369S112030, C369S112150

Reexamination Certificate

active

06927375

ABSTRACT:
A light beam reflected by an information medium is split by a diffraction optical system into first diffraction light and second diffraction light, which is not a complex conjugate wave of the first diffraction light, in a predetermined energy distribution ratio. The first diffraction light enters a first photodetector (195) of a photodetector and is used for reading out data information recorded on the information medium, while the second diffraction light enters second and third photodetectors (194, 195) and is used for obtaining a servo error signal. With this optical head device, the area of the first photodetector can be reduced, thus allowing a high-speed reproduction of a data signal. Further, the first photodetector becomes less susceptible to stray light. Moreover, the number of head amplifiers, which are needed for detecting the data signal, decreases, and the S/N ratio improves.

REFERENCES:
patent: 5737296 (1998-04-01), Komma et al.
patent: 5920537 (1999-07-01), Komma et al.
patent: 8-329512 (1996-12-01), None
patent: 9-7212 (1997-01-01), None

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