Zoom lens barrel having a rotatable diaphragm mechanism and a me

Details Zoom lens barrel having a rotatable diaphragm mechanism and a me Zoom lens barrel having a rotatable diaphragm mechanism and a me

1995-09-08

1997-09-02

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359702, 359694, 396103, 396461, G02B 1514, G02B 118, G02B 900

Patent

active

056638396

ABSTRACT:
A zoom lens barrel has a first lens unit, a second lens unit sharing an optical axis with the first lens unit, a fixed barrel for containing the first lens unit and the second lens unit, a first lens unit shifting frame held in the fixed barrel so as to be shiftable in a direction of the optical axis or in a direction around the optical axis for holding the first lens unit, a second lens unit shifting frame held in the lens unit shifting frame so as to be shiftable in a direction of the optical axis or in a direction around the optical axis for holding the second lens unit, a zooming mechanism held by the fixed barrel so as to be rotatable around the optical axis for shifting the first lens unit shifting frame in the optical axis direction to perform zooming when the zooming mechanism is rotated around the optical axis, a focusing mechanism held by the fixed barrel so as to be rotatable around the optical axis for rotating the second lens unit shifting frame around the optical axis and shifting the second lens unit shifting frame in the optical axis direction to perform focusing when the focusing mechanism is rotated around the optical axis, a diaphragm mechanism held by the second lens unit shifting frame so as to be rotatable around the optical axis for adjusting an aperture diameter when the diaphragm mechanism is rotated, and a diaphragm correcting mechanism.

REFERENCES:
patent: 4141636 (1979-02-01), Shimojima
patent: 4233472 (1980-11-01), Haraguchi
patent: 4258996 (1981-03-01), Uesugi
patent: 4448496 (1984-05-01), Isobe
patent: 4544240 (1985-10-01), Shimizu
patent: 4717933 (1988-01-01), Ando
patent: 4920369 (1990-04-01), Kaneda
patent: 5099263 (1992-03-01), Matsumoto
patent: 5144490 (1992-09-01), Yamanouchi
patent: 5200860 (1993-04-01), Hirasawa
patent: 5339126 (1994-08-01), Shimose
patent: 5410432 (1995-04-01), Kobayashi
patent: 5467158 (1995-11-01), Murashima

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