Dual-focus objective lens of optical pickup

Details Dual-focus objective lens of optical pickup Dual-focus objective lens of optical pickup

1995-12-26

1998-03-31

Nelms, David C.

Optical: systems and elements

Lens

Plural focal length

359637, 359717, 359719, G02B 310, G02B 2714, G02B 302

Patent

active

057345120

ABSTRACT:
A dual-focus objective lens for an optical pickup which is compatible with both 0.6 mm and 1.2 mm disks is compensated in its aberration with respect to a light spot on a recording plane of the loaded disk and is composed of a first lens and a second lens. The loaded positions of the 0.6 mm disk and 1.2 mm disk in view of the second lens are different from each other. An optical pickup having the dual-focus objective lens can reproduce a signal with a high signal-to-noise ratio and has improved light efficiency. Also, an optical pickup enabling recording as well as reproduction is obtained.

REFERENCES:
patent: 1616765 (1927-02-01), Sonnefeld
patent: 2642488 (1953-06-01), Epstein
patent: 2685821 (1954-08-01), Tillyer et al.
patent: 3594066 (1971-07-01), Cook
patent: 3762801 (1973-10-01), Baker
patent: 4577941 (1986-03-01), Kubota
Y. Komma et al., "Dual focus optical head for 0.6mm and 1.2mm disks," 288/SPIE, vol. 2338, Optical Data Storage (1994), pp. 282-287.

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