Recording and/or reproducing optical system and objective lens f

Details Recording and/or reproducing optical system and objective lens f Recording and/or reproducing optical system and objective lens f

1997-06-30

1999-03-16

Epps, Georgia

Optical: systems and elements

Lens

Including a nonspherical surface

369112, G02B 302

Patent

active

058837477

ABSTRACT:
An apparatus for recording or reproducing information on an information recording surface of an optical information recording medium having a transparent substrate, includes a laser source to emit a light beam having a wavelength of .lambda. nm; and an objective lens to converge the light beam emitted from the laser source on the information recording surface of the optical information recording medium through the transparent substrate. When the light beam is converged through the transparent substrate of the optical information recording medium, a wavefront aberration of the objective lens has a curve which has a step at a numerical aperture (NA), and the following conditions are satisfied,

REFERENCES:
patent: 5615199 (1997-03-01), Tatsuno et al.
patent: 5684641 (1997-11-01), Tanaka et al.
patent: 5790506 (1998-08-01), Morita et al.
Patent Abstracts Of Japan, vol. 096, No. 003, Mar. 29, 1996 & JP 07 302437 A (Toshiba Corp.), Nov. 14, 1995.
Patent Abstracts Of Japan, vol. 095, No. 006, Jul. 31, 1995 & JP 07 057271 (Matsushita Electric Ind., Co., Ltd.), Mar. 3, 1995.
Patent Abstracts Of Japan, vol. 095, No. 007, Aug. 31, 1995 & JP 07 098431 A (Matsushita Electric Inc., Co., Ltd.), Apr. 11, 1995.

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