1986-04-02
1990-03-13
Arnold, Bruce Y.
350413, G02B 15177
Patent
active
049078666
ABSTRACT:
An objective of variable focal length includes a plurality of lens units of which the first, counting from front, is of negative power and the second is of positive power. At least the first and second lens units are moved with variation of the air separation therebetween to vary the focal length of the entire system. The objective is characterized in that at least one of the lens units is included with at least one refractive index distribution type lens arranged on the common optical axis of the other lenses.
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Atkinson, III et al., "Gradient-Index Wide-Angle Photographic Objective Design", Applied Optics, vol. 23, No. 11, Jun. 1984, pp. 1735-1741.
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Hattori Jun
Horiuchi Akihisa
Kitagishi Nozomu
Nakayama Hiroki
Suda Shigeyuki
Arnold Bruce Y.
Callaghan Terry S.
Canon Kabushiki Kaisha
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