Zooming operation apparatus of zoom lens

Details Zooming operation apparatus of zoom lens Zooming operation apparatus of zoom lens

1989-05-12

1991-07-30

Bovernick, Rodney B.

35419512, G02B 1500

Patent

active

050354930

ABSTRACT:
A zooming operation apparatus of zoom lens is provided with a first and a second zoom driving mechanism. The first zoom driving mechanism is formed at an engaging section where the rotation of a zooming operation ring which is only rotatably held by a stationary barrel is engaged with a zoom cam ring which is only rectilinearly movably held by the stationary barrel inside the zooming operation ring and at a position between the zoom cam ring and the stationary barrel thereby converting the rotation of the zooming operation ring into the rectilinear movement of the zoom cam ring. The zoom cam ring incorporatively moves a first lens unit with the rectilinear movement. The second zoom driving mechanism is formed at a position between the zoom cam ring and the stationary barrel, and converts the rectilinear movement of the zoom cam ring into another rectilinear movement of a second lens unit. Zooming operation is thus carried out by the rectilinear movement of the first and second lens units.

REFERENCES:
patent: 4275952 (1981-06-01), Uesugi
patent: 4759618 (1988-07-01), Kamata

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