Lens barrel

Details Lens barrel Lens barrel

1992-05-29

1994-12-27

Hayes, Monroe H.

Optical: systems and elements

Prism

With reflecting surface

354286, 359825, 359826, G03B 118

Patent

active

053769830

ABSTRACT:
When moving frames are incorporated in a fixed frame and a cam ring, the lens barrel according to this invention is ready for fitting cam followers of the moving frames in the fixed frame or a plurality of moving cain grooves disposed on the cam ring irrespective of the number of moving frames to be incorporated, thus inserting the cam followers in the moving cam grooves by way of a single assembling cam groove. Accordingly, an assembling work of the moving frames in the fixed frame and the cam ring will be greatly facilitated and in an arrangement for which the moving cam grooves are provided on the cam ring, since the cam grooves may be bottomed cam grooves, a high rigidity cam ring will be realized. The lens barrel is further provided with a barrier closing assembly for selectively covering and uncovering an object end of the lens barrel. The barrier closing assembly is closed responsive to movement of a zoom unit to a collapsed position and to movement of focussing lens group to a power off position and automatically uncovers the lens barrel responsive to movement of the zoom unit from the collapsed position toward a wide angle position, the opening force being provided by a biasing spring.

REFERENCES:
patent: 1213731 (1917-01-01), Bornmann
patent: 1720224 (1929-07-01), Lessler et al.
patent: 3118359 (1964-01-01), Leitz et al.
patent: 4002405 (1977-01-01), Stahl
patent: 4154510 (1979-05-01), Katagiri
patent: 4627691 (1986-12-01), Tomori
patent: 4841323 (1989-06-01), Yamada et al.
patent: 4934789 (1990-06-01), Lemke
patent: 4993815 (1991-02-01), Yamazaki et al.
patent: 5091802 (1992-02-01), Imaoka et al.

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