Optical: systems and elements – Lens – With variable magnification
Patent
1991-11-26
1993-12-14
Arnold, Bruce Y.
Optical: systems and elements
Lens
With variable magnification
359676, 359683, G02B 1514, G02B 15177
Patent
active
052708667
ABSTRACT:
A zoom lens comprising, from front to rear, a first lens unit of negative power, a second lens unit of positive power and a third lens unit of negative power, the second and third lens units being moved to effect zooming, and the third lens unit having its focal length f.sub.3 laid in the following range:
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Ikemori Keiji
Matsushita Takashi
Nakayama Hiroki
Oizumi Kouji
Sato Yasuhisa
Arnold Bruce Y.
Canon Kabushiki Kaisha
Parsons David R.
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