Super-resolution optical head device which produces side spots w

Details Super-resolution optical head device which produces side spots w Super-resolution optical head device which produces side spots w

1996-04-04

1997-12-23

Nelms, David C.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4437, 369107, 369103, 369112, G11B 700

Patent

active

057012865

ABSTRACT:
A super-resolution optical head device includes a diffraction grating having central and peripheral areas. The central area suppresses zero order diffracted light and produces .+-.1th order diffracted light. The peripheral area produces both zero order diffracted light and .+-.1th order diffracted light. The .+-.1th order diffracted light from the central and peripheral areas forms side light beams without an aperture. The side light beams form side spots on a recording medium. The side spots are not accompanied by side lobes because the side light beams do not have an aperture therein.

REFERENCES:
patent: 5113286 (1992-05-01), Morrison
patent: 5153873 (1992-10-01), Spruit et al.
patent: 5349592 (1994-09-01), Ando
patent: 5434840 (1995-07-01), Ezuka et al.
patent: 5612942 (1997-03-01), Takahashi

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