Optical: systems and elements – Diffraction – From grating
Reexamination Certificate
2006-05-23
2006-05-23
Assaf, Fayez G. (Department: 2872)
Optical: systems and elements
Diffraction
From grating
C359S570000, C359S708000, C369S112080
Reexamination Certificate
active
07050236
ABSTRACT:
The present invention relates to a diffractive optical element which has chromatic aberration capable of recording and reproducing without any problem even in the case of instantaneous wavelength change in a laser beam that cannot be followed by an actuator, and can control an adverse effect caused on a spot diameter of a converged spot and on a signal read by a sensor. The diffractive optical element includes a diffractive structure, and diffraction efficiency of mthorder diffracted beam satisfies prescribed conditions, and a distance between a paraxial converging position of the diffracted beam having a higher diffraction efficiency among (m+1)thorder diffracted beam and (m−1)thorder diffracted beam and a paraxial converging position of the mthdiffracted beam satisfies prescribed conditions, when m represents a diffraction order number of the diffracted beam used for the first optical information recording medium.
REFERENCES:
patent: 5969862 (1999-10-01), Maruyama
patent: 6411442 (2002-06-01), Ota et al.
patent: 2004/0036972 (2004-02-01), Kimura et al.
patent: 2002-298422 (2002-10-01), None
Assaf Fayez G.
Cohen & Pontani, Lieberman & Pavane
Konica Minolta Opto Inc.
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