Optical: systems and elements – Lens – Including a nonspherical surface
Patent
1997-01-13
1998-11-10
Epps, Georgia Y.
Optical: systems and elements
Lens
Including a nonspherical surface
359721, 369 4423, 369112, G02B 302, G02B 310, G11B 700
Patent
active
058352830
ABSTRACT:
A condenser lens to be used for an optical head capable of recording or reading information on or from optical disks having different substrate thicknesses in an optical disk device such as a CD or the like. A light beam emitted from a laser light source is focused by a condenser lens to form a minute spot. The incident surface of the condenser lens is divided into a plurality of division areas which are sufficiently small with respect to the lens opening. The division areas constitute first and second lens surfaces, that is, parts of lens surfaces of two different lenses. The light beam is focused by the first lens surface to form a minute spot on a first optical disk and by the second lens surface to from a minute spot on a second optical disk. The two lenses can be optimized independently and be designed readily. One condenser lens having the first and second lens surfaces can form two kinds of light beam spots and adaptable to two optical disks having different substrate thicknesses.
REFERENCES:
patent: 5161040 (1992-11-01), Yokoyama et al.
patent: 5703862 (1997-12-01), Lee et al.
patent: 5764603 (1998-06-01), Glaser-Inbari
Yoshiaki Komma, et al. "Dual Focus Optical Head for 0.6mm and 1.2mm Disks", Optical Data Storage, vol. 2338, 1994, pp. 282-288.
Y. Komma et al.; "Dual Focus Optical Head for 0.6mm and 1.2mm Disks"; Optical Review, vol. 1, No. 1 (1994), pp. 27-29.
Epps Georgia Y.
NEC Corporation
Schwartz Jordan M.
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