Device for zoom lenses

Claim 2

A zooming device for zoom lenses claimed in claim 1, wherein at least one restraining rod is provided within said barrel on a side of the optical axis opposite and parallel to said two guide rods, said zooming component frame and said compensating component frame each being provided with a notch portion for engaging with said restraining rod, and said restraining rod being arranged to restrain the turning of both said component frames using both said guide rods in which both component frames slidably fit respectively as a center.

Claim 3

A zooming device for zoom lenses claimed in claim 3, further including a square-shaped rear frame fixed to the interior of the exterior lens barrel and at right angles to the optical axis, four supports projecting forwardly from each respective corner of said rear frame, and a front frame fixed to the front ends of said supports and at right angles to the optical axis; said two guide rods extending between said front and rear frames.

Claim 4

A zooming device for zoom lenses claimed in claim 4, wherein said front frame is provided with: a rearwardly bent member extending outwardly of said guide rods and parallel thereto; said shaft being provided outwardly of saiD bent member; a bracket rotatably fitted on said shaft; a knob fixed on the outer end of said bracket; and said cam plate being fixed to the inner end of said bracket.

Claim 5

A zooming device for zoom lens, comprising: supports projecting from each respective corner of a square-shaped rear frame; a square-shaped front frame fixed to the front ends of said supports; a frame member disposed between the ends of said supports; a first guide rod supported by said front frame and said rear frame and parallel to the optical axis; a second guide rod supported by said frame member and said rear frame and parallel to the optical axis; a zooming component frame slidably mounted on said first guide rod for movement along the optical axis and being provided with a zooming component; a slot formed on said zooming component frame and at right angles to the moving direction of said zooming component frame; an engagement pin projecting from the compensating component frame in a direction at right angles to the optical axis; a shaft at right angles to the optical axis; a rotatable cam plate at right angles to said shaft; a cam slot formed in said plate, in which said engagement pin fits; and a working pin on said cam plate for engaging with said cam slot.

Claim 6

A zooming device for zoom lens claimed in claim 6, wherein said second guide rod is fixedly mounted between said frame member and said rear frame and parallel to the optical axis and is disposed near a plane at right angles to said cam plate including the optical axis.