Two-wavelength optical pickup device with step-like...

Details Two-wavelength optical pickup device with step-like... Two-wavelength optical pickup device with step-like...

2005-03-29

2005-03-29

Klimowicz, William (Department: 2652)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

Reexamination Certificate

active

06873591

ABSTRACT:
An optical pickup device is equipped with a first light source that emits first light, a second light source that emits second light having a wavelength different from a wavelength of the first light, and a diffraction element that deflects the first light or the second light to match optical axes of the lights. The diffraction element is a step-like diffraction element in which one of an incident face and an emitting face thereof has a step-like grating face. A step difference of the step-like grating face is set to have a measurement that generates a phase difference of one wavelength of one of the first light and the second light, and the number of steps of the step-like grating face is set to maximize a (+) first order diffraction efficiency or a (−) first order diffraction efficiency for the other light.

REFERENCES:
patent: 5400311 (1995-03-01), Komma et al.
patent: 6084843 (2000-07-01), Abe et al.
patent: 6414930 (2002-07-01), Shiono et al.
patent: 6449237 (2002-09-01), Yoo et al.
patent: 6545821 (2003-04-01), Katsuma

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