Write and read objective lens for high density storage

Details Write and read objective lens for high density storage Write and read objective lens for high density storage

G - Physics

02

B

88/106

G02B 9/36 (2006.01) G02B 9/34 (2006.01) G02B 13/24 (2006.01)

Patent

CA 1119032

ABSTRACT OF THE DISCLOSURE A write and read objective lens system for encoding and recovery of information upon a storage member comprising three single lenses and one achromatic doublet for which the working distance is large and exhibits excellent flatness of field and resolving power, the system including at least a first, second, third and fourth lens said first lens being a positive meniscus object lens having a concave surface positioned toward the object side, said second lens being a positive achromatic doublet, said third lens being a negative meniscus lens having a concave surface positioned toward the image side, said fourth lens being a positive image lens, said lens system being utilizable with a plurality of wavelengths of light, said lens system satisfying the following conditions.

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