Internal focusing zoom lens with means preventing lens warping e

Details Internal focusing zoom lens with means preventing lens warping e Internal focusing zoom lens with means preventing lens warping e

1997-02-13

1998-07-07

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359703, G02B 1514

Patent

active

057778019

ABSTRACT:
A helicoid is formed at the outer periphery of the front of a body fixing lens barrel, and a helicoid is formed at the inner periphery of the back of the focusing lens barrel in such a manner that these two helicoids can be engaged with each other. A movable focusing lens group is held by the front of the focusing lens barrel so that the helicoid can be pushed to one side and the inaccurateness of the focus can be reduced. A lens hood is attached to a fixed focus lens frame fixed to a focus fixing lens barrel, which is different from the body fixing lens barrel. Thereby, even if the focus fixing lens barrel is deformed by the force generated by the attachment, the deformation does not warp the helicoid.

REFERENCES:
patent: 4357085 (1982-11-01), Niwa et al.
patent: 4472031 (1984-09-01), Muryoi
patent: 4560237 (1985-12-01), Ohkura et al.
patent: 4731669 (1988-03-01), Hayashi et al.
patent: 5264966 (1993-11-01), Okada et al.
patent: 5335032 (1994-08-01), Onuki et al.
patent: 5528430 (1996-06-01), Hamasaki

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