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

1995-02-28

1999-10-26

Huber, Paul W.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, 369112, G11B 509, G11B 700

Patent

active

059740116

ABSTRACT:
A light beam condensing apparatus is provided to introduce 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 is disclosed.
There is provided modulation means 111 provided between a collimate lens 102 and an objective lens 105, for externally controlling and varying an amplitude or a phase of a collimate beam 104. The modulation means 111 is mechanically or electrically driven. Further, the modulation means 111 can be switched according to an operation mode of a drive unit or a kind of a recording medium 106 so as to provide a desired condensing spot shape.

REFERENCES:
patent: 3787888 (1974-01-01), Haskal
patent: 4125859 (1978-11-01), Oshida et al.
patent: 4853915 (1989-08-01), Takasago et al.
patent: 5105413 (1992-04-01), Bakx
patent: 5291471 (1994-03-01), Russell
patent: 5349592 (1994-09-01), Ando
patent: 5434840 (1995-07-01), Ezuka et al.
Yamanaka & Kubota "High Density Recording For Optical Disc By High Resolution" vol. 18, No. 12 (23-89).
Ando "Phase-Shifting Apodizer of Three or More Portions " Jan. 18, 1992.

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