Optical: systems and elements – Lens – With variable magnification
Patent
1991-11-14
1993-03-30
Ben, Loha
Optical: systems and elements
Lens
With variable magnification
359696, 359829, 35419512, G02B 1514
Patent
active
051989328
ABSTRACT:
A zoom lens assembly has a stationary barrel, a middle barrel and a movable barrel. The middle barrel is formed on its outer periphery at a rear end thereof with a helicoidal thread, which engages with a helicoidal thread formed on the inner surface of the stationary barrel. The movable barrel holds a zoom lens system therein, and is formed on its outer periphery at a rear end portion with a helicoidal thread which engages with a helicoidal thread formed in the inner surface of the middle barrel. The middle barrel is provided at its rear end portion with a driven gear having a small face width. The driven gear meshes with a drive gear through a cut-out of the stationary barrel. Rotational movement of a zoom motor is transmitted to the driven gear of the middle barrel through the drive gear, so that the middle barrel is rotated to move in the direction of the optical axis of the assembly. The gearing portion of the drive gear moves along with the axial movement of the driven gear, so as to maintain the engagement between these gears.
REFERENCES:
patent: 3914026 (1975-10-01), Kanno
patent: 3997245 (1976-12-01), Uesugi
patent: 4333712 (1982-06-01), Tomori
patent: 4468107 (1984-08-01), Yabe
Ben Loha
Fuji Photo Film Co. , Ltd.
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