Patent
1982-12-08
1985-03-26
Corbin, John K.
350429, 350255, G02B 710, G02B 1510
Patent
active
045069590
ABSTRACT:
An apparatus for converting of zooming photographing to macro photographing and vice versa in a zoom lens assembly comprising a mount securing lens barrel, a convert ring fitted on the periphery of the mount securing, an actuation ring which is fitted on the convert ring, wherein the apparatus comprises a ball retaining groove provided on the mount securing lens barrel, a radial through hole on the convert ring, a ball which is located in the elongated hole so as to move therein, a ball receiving hole provided on the actuation ring, said ball being located between the ball retaining groove and the radial through hole during rotating of the actuation ring for focusing at one zooming end position thereof, to prevent the convert ring from rotating relative to the mount securing lens barrel, said ball coming out of the ball retaining groove when the actuation ring rotates for macro photographing so that the ball comes between the radial through hole and the ball receiving hole to make the convert ring integral with the actuation ring in order to make a relative rotation of the convert ring to the mount securing lens barrel possible.
REFERENCES:
patent: 4322150 (1982-03-01), Kamata et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Corbin John K.
Dzierzynski P. M.
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