Patent
1988-12-21
1990-08-21
Arnold, Bruce V.
350255, 354400, G02B 1500
Patent
active
049500619
ABSTRACT:
A device for driving a varifocal lens, includes a first group frame supporting the first group of lenses therein in a movable manner for focussing and supported with the lens barrel inside said fixed frame movably in parallel with said optical axis, a second group frame supporting the second group of lenses therein in a fixed manner and supported with the first group frame inside the first group frame movably in parallel with said optical axis, at least three driver screw members disposed within the fixed frame in parallel with optical axis, at least three driver gear members held in mesh with the driver screw members respectively, and a drive unit for driving the driver gear members to thereby move the lens barrel frame and the first group frame by a predetermined amount respectively.
REFERENCES:
patent: 4847650 (1989-07-01), Iida et al.
Sawabe Kosaku
Tsurukawa Ikuya
Yamaguchi Kunihisa
Arnold Bruce V.
Ben Loha
Ricoh & Company, Ltd.
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