Optical: systems and elements – Lens – Multiple component lenses
Patent
1995-09-14
1997-07-01
Phan, James
Optical: systems and elements
Lens
Multiple component lenses
359784, G02B 904
Patent
active
056444370
ABSTRACT:
An optical system of an optical information recording/reproducing apparatus includes an objective lens for converging a generally parallel luminous flux. A chromatic aberration correction element for correcting chromatic aberration of the objective lens is provided and has substantially no power. The chromatic aberration correcting element comprises a positive lens and a negative lens positioned in the generally parallel luminous flux. The positive and negative lenses of the chromatic aberration correcting element have substantially the same refractive index and different Abbe's number.
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patent: 4572623 (1986-02-01), Tanaka et al.
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"Single Lens CD Player Pickup System Using a Bio-aspheric Molded Glass Lens" (Sunohara et al., I.E.E.E. Transactions on Consumer Electronics, vol. CE-33, No. 4, pp. 520-530, Nov. 1987, New York, NY).
Iwaki Makoto
Maruyama Koichi
Asahi Kogaku Kogyo Kabushiki Kaisha
Phan James
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