Optical pickup device using hologram pattern and hologram...

Optical: systems and elements – Holographic system or element – Using a hologram as an optical element

Reexamination Certificate

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C359S019000, C369S103000, C369S112100, C369S112150

Reexamination Certificate

active

07050207

ABSTRACT:
Astigmatism and coma are suppressed in an optical pickup device such that light from a single real laser light source is diffracted and divided by a hologram module into a plurality of light spots which are focused upon a plurality of tracks of an optical disk to read data on the tracks at the same time. A non-diffraction end of fraction hologram patterns of the hologram module are determined so that light diffracted by the hologram module is given inverse aberration of that to be caused by optical elements in optical path from the real laser light source to the optical disk. Another hologram pattern provides a uniform intensity of a light spot formed of a laser light by an optical element.

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English Translation of Japanese Office Action (Notification of Reasons for Refusal) dated Apr. 9, 2002.
Partial Translation of Korean Office Action (Notification of Reason for Refusal) dated Apr. 30, 2002.

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