System and method using a reduce profile light beam for high den

Details System and method using a reduce profile light beam for high den System and method using a reduce profile light beam for high den

1991-08-01

1993-07-27

McElheny, Jr., Donald E.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369118, G11B 700

Patent

active

052316246

ABSTRACT:
A system and method for recording on optical storage media utilize a beam projection assembly including a collimating lens and an objective lens. By providing an incident light beam having a substantially constant energy distribution to the objective lens, the radius of the spot projected on the optical media having an intensity greater than a threshold intensity may be increased. The radius may be further decreased by modifying the optics of the objective lens, typically by providing a center stop plate on the lens or by providing a one-half wavelength plate on the lens.

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patent: 5025438 (1991-06-01), Emoto
patent: 5121378 (1992-06-01), Hirose et al.

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