Patent
1978-05-02
1979-09-25
Henry, Jon W.
350255, G02B 1518, G02B 710
Patent
active
041688848
ABSTRACT:
A varifocal objective with a front component, axially shiftable for focusing purposes, and with a second and third component, axially displaceable by camming grooves in a control sleeve for changing the focal length, is provided with a coupling ring centered on the objective axis which is axially entrained by the lens mount of the front component. During normal operation, the coupling ring is indexed in a disengagement position. When the front component is in its infinity position and the control sleeve has cammed the second and third components into their wide-angle position, the coupling ring is manually rotatable into an engagement position in which it links the lens mount of the first component with that of the third component for joint axial shifting into a macro range by the focusing drive; such shifting is facilitated by an axial slot in the control sleeve preventing rotation of the latter in that range.
REFERENCES:
patent: 3613544 (1971-10-01), Plihal et al.
patent: 3655271 (1972-04-01), Suzuki
patent: 3659921 (1972-05-01), Hirose et al.
patent: 3661445 (1972-05-01), Someya
patent: 3884555 (1975-05-01), Suwa et al.
patent: 4054372 (1977-10-01), Schroeder
Henry Jon W.
Jos. Schneider & Co. Optische Werke Kreuznach
Ross Karl F.
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