Objective lens for a pickup optical system

Details Objective lens for a pickup optical system Objective lens for a pickup optical system

1998-03-02

1999-08-10

Epps, Georgia

Optical: systems and elements

Lens

Including a nonspherical surface

359742, 359743, G02B 302, G02B 308

Patent

active

059367822

ABSTRACT:
An objective lens for a pickup optical system for optically reading out information recorded in a recording medium , includes a first lens body and a second lens body integrally attached to a surface of the first lens body and having a micro Fresnel portion for focusing light to a predetermined position of the recording medium. When the objective lens is used for a pickup optical system, the micro Fresnel portion faces away from an accommodation region for accommodating the recording medium to prevent dust from attaching to the micro Fresnel portion.

REFERENCES:
patent: 4514052 (1985-04-01), Yamaguchi
patent: 4733943 (1988-03-01), Suzuki et al.
patent: 4737447 (1988-04-01), Suzuki et al.
patent: 5777971 (1998-07-01), Choi

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