Optical: systems and elements – Lens – With variable magnification
Patent
1995-06-07
1998-07-21
Font, Frank G.
Optical: systems and elements
Lens
With variable magnification
359683, 359684, 359685, G02B 1514
Patent
active
057842051
ABSTRACT:
A zoom lens includes, from front to rear, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power and a fourth lens unit having a positive refractive power, at least the second and fourth lens units being moved to effect zooming, wherein the maximum image angle is increased while the diameter of the first lens unit is extremely reduced.
REFERENCES:
patent: 5138492 (1992-08-01), Hamano et al.
patent: 5179472 (1993-01-01), Ohno et al.
patent: 5247393 (1993-09-01), Sugawara
patent: 5341243 (1994-08-01), Okuyama et al.
patent: 5353157 (1994-10-01), Horiuchi
Horiuchi Akihisa
Mukaiya Hitoshi
Murata Yasunori
Nakayama Hiroki
Wachi Fumihito
Canon Kabushiki Kaisha
Font Frank G.
Schwartz Jordan M.
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