Zoom lens mechanism

Details Zoom lens mechanism Zoom lens mechanism

1995-06-06

1996-12-24

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359829, 359826, G02B 1514

Patent

active

055878431

ABSTRACT:
An improved zoom lens mechanism is disclosed which allows the outer diameter of the zooming assembly to be reduced. It contains: (a) a focusing ring having a plurality of focusing pins; (b) a first barrel with longitudinal slots which is interconnected with a rear portion of the focusing ring, and contains a plurality of transverse slots at a front portion thereof respectively matching the positions of the focusing pins, the first barrel also contains a plurality of diametrically disposed longitudinal slots; (c) an outer ring disposed at the front portion the first barrel, the outer ring is provided with a plurality of second straight slots providing passages for the focusing pins; (d) an inner ring disposed at a rear portion of the outer ring, the inner ring is attached at a rear end of the first barrel, the inner ring is interconnected with the outer ring, both the inner and outer rings are provided with a plurality of beads; and each of the beads penetrates through the longitudinal straight slot; and (e) a second barrel with spiral slots which is disposed at an outer portion of the first barrel, the second barrel has a front end portion which is provided with a plurality of first contour holes for receiving respective beads disposed within an inner ring, the front portion of the second barrel is also provided with a second and third contour holes which are disposed adjacent to the first contour hole.

REFERENCES:
patent: 4822153 (1989-04-01), Tomori et al.
patent: 5144494 (1992-09-01), Sekiguchi

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