Lens device having a focusing lens unit coupled to a drive ring

Details Lens device having a focusing lens unit coupled to a drive ring Lens device having a focusing lens unit coupled to a drive ring

1997-01-29

1998-05-19

Perkey, W. B.

Photography

With exposure objective focusing means, focusing aid, or...

Mechanical mechanism for displacement of exposure objective

396451, G03B 300

Patent

active

057548960

ABSTRACT:
A lens device having a base unit, a lens unit and an intermediate member. The base unit includes a drive ring which is rotatable around an optical axis of the lens device and has a coupling portion which protrudes into the housing space. The lens unit is inserted into a housing space of the base unit. Moreover, the lens unit is rotatable around the optical axis of the lens device and rotatably coupled to the base unit so that the rotation of the lens unit around the optical axis of the lens device causes the lens unit to move along the optical axis. The intermediate member is connected to the lens unit and has a groove. The coupling portion of the drive ring is engaged in the groove so that the rotation of the drive ring causes the coupling portion to interact with the groove to move the intermediate member. The movement of the intermediate member causes the lens unit to rotate around, and thereby move along, the optical axis in accordance with the rotation of the drive ring. The lens unit includes a notch so that, when the lens unit is inserted into the housing space of the base unit, the coupling portion of the drive unit passes through the notch and engages with the groove of the intermediate member, thereby allowing the lens unit to be inserted into the housing space of the base unit without being obstructed by the coupling portion.

REFERENCES:
patent: 5033819 (1991-07-01), Tanaka
patent: 5461443 (1995-10-01), Nakayama et al.
patent: 5587754 (1996-12-01), Katayama et al.

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