Light beam condensing apparatus and method of driving optical re

Details Light beam condensing apparatus and method of driving optical re Light beam condensing apparatus and method of driving optical re

1996-07-16

1997-07-01

Epps, Georgia Y.

Optical: systems and elements

Optical modulator

Light wave temporal modulation

369 4423, 369112, G02F 107

Patent

active

056444206

ABSTRACT:
A light beam condensing apparatus is provided for introducing a condensing spot of a laser beam onto an optical recording medium such as optical disks, and a method of driving the optical recording medium by applying the apparatus. The apparatus can include a modulator disposed between a collimate lens and an objective lens. The modulator can be mechanically or electrically driven to control and vary the amplitude or phase of a collimate beam. Further, the modulator can be switched according to an operational mode of a drive unit or a type of a recording medium so as to provide a desired condensing spot shape.

REFERENCES:
patent: 3394347 (1968-07-01), Crane
patent: 3426293 (1969-02-01), Snitzer
patent: 3631409 (1971-12-01), Buchan
patent: 3736046 (1973-05-01), Zook
patent: 5060283 (1991-10-01), Shiraishi
patent: 5452272 (1995-09-01), Murakami et al.
Yamanaka & Kubota "High Density Recording For Optical Disc By High Resolution" vol. 18, No. 12 (12-89).
Ando "Phase-Shifting Apodizer of Three or More Portions" Jan. 18, 1992.

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