1986-06-09
1988-10-11
Corbin, John K.
G02B 1514
Patent
active
047766794
ABSTRACT:
A variable focal length objective of which at least one of a pulrality of lens units is moved to vary the image magnification, wherein at least one of the plurality of lens units has at least one refractive index distribution type lens provided with a condition of N.sub.1 >0 as, taking the distance from the optical axis to a radial direction as h, the refractive index distribution is expressed by N(h)=N.sub.0 +N.sub.1 h.sup.2 +N.sub.2 h.sup.4 +N.sub.3 h.sup.6 +. . . (N.sub.0, N.sub.1, N.sub.2 . . . are constants), and satisfies the following conditions: ##EQU1## where fmax: the maximum focal length;
REFERENCES:
patent: 3718383 (1973-02-01), Moore
patent: 3729253 (1973-04-01), Moore
patent: 4571032 (1986-02-01), Someya et al.
Meyer-Arendt, Intro. Clas. and Mod. Optics (1984) 362.5.
Atkinson et al., App. Optics, vol. 21, No. 6 (1982) 993:8.
Atkinson III et al., App. Optics, vol. 23, No. 11 (1984) 1735:41
Hattori Jun
Horiuchi Akihisa
Kitagishi Nozomu
Nakayama Hiroki
Suda Shigeyuki
Canon Kabushiki Kaisha
Corbin John K.
Gass Rebecca D.
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