Objective lens for optical pick-up head of optical disk drive

Details Objective lens for optical pick-up head of optical disk drive Objective lens for optical pick-up head of optical disk drive

1996-02-23

1998-07-07

Sugarman, Scott J.

Optical: systems and elements

Lens

Including a nonspherical surface

359742, 359743, G02B 1318, G02B 308

Patent

active

057778035

ABSTRACT:
An objective lens for an optical disk drive is disclosed. The objective lens comprises four portions each having a aspherical surface for focusing a light beam of a designated wavelength to a designated focal point. The first portion has a first aspherical surface that focuses the light beam to a first focal point. The second portion has a second aspherical surface that focuses the light beam to a second focal point. The third portion has a third aspherical surface featuring the same surface curvature characteristics as that of the first aspherical surface and focuses the light beam to the first focal point. And, the fourth portion has a fourth aspherical surface featuring the same surface curvature characteristics as that of the second aspherical surface and focuses the light beam to the second focal point. The objective lens can be made as a single-piece lens that suffers no energy loss for either focusing.

REFERENCES:
patent: 5153778 (1992-10-01), Sasian-Alvarado

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