Zoom lens barrel with flat faced helicoid threading

Details Zoom lens barrel with flat faced helicoid threading Zoom lens barrel with flat faced helicoid threading

1995-06-30

1997-06-03

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359694, G02B 1514

Patent

active

056360649

ABSTRACT:
An end surface of external helicoid threads provided on an inner movable barrel and an end surface of a ring member attached to an outer barrel having internal helicoid threads are arranged to be parallel, in order that the ring member does not undergo detaching forces. The ring member is thereby able to resist detachment if the inner barrel is overextended.

REFERENCES:
patent: 4439019 (1984-03-01), Muryoi
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patent: 5198932 (1993-03-01), Takamura
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patent: 5262898 (1993-11-01), Nomura
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patent: 5349408 (1994-09-01), Nomura et al.
patent: 5349475 (1994-09-01), Nomura
patent: 5386740 (1995-02-01), Nomura et al.
patent: 5467227 (1995-11-01), Nomura

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