Method for preparing an optical device using position...

Details Method for preparing an optical device using position... Method for preparing an optical device using position...

Filed on

2006-12-05

Date issued

2006-12-05

Examiner

Huber, Paul (Department: 2627)

Patent Class

Dynamic information storage or retrieval

SubClass

Specific detail of information handling portion of system

SubSubClass

Radiation beam modification of or by storage medium

Type

Reexamination Certificate

Status

active

Patent number

07145860

Description

ABSTRACT:
An optical device used for converging a light beam on a signal recording surface of an optical disc includes an optical lens for converging the light beam on a signal recording surface of the optical disc and a light barrier portion provided on a surface of the optical lens facing the optical disc. The light barrier portion includes a light transmitting aperture through which is transmitted the light beam converged by the optical lens. The light beam illuminated on the optical disc has its diameter controlled by this light transmitting aperture. The light radiated by a light source so as to be incident to the optical device is converged by the optical lens. The light converged by the optical lens is transmitted through the light transmitting aperture and illuminated on the signal recording surface of the optical disc. The diameter of the light beam illuminated on the signal recording surface of the optical disc is controlled by the light transmitting aperture, and thus the numerical aperture NA of the optical device is determined.

REFERENCES:
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patent: 6359852 (2002-03-01), Ueyanagi
patent: 6473384 (2002-10-01), Oumi et al.
patent: 6498776 (2002-12-01), Nakano et al.
patent: 6545970 (2003-04-01), Durnin et al.
patent: 10-123410 (1998-05-01), None

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