A Direct-Drive Automatic Iris Control

Mervin W. La Rue, John P. Bagby, Stephen F. Bushman, Stanley R. Freeland, David M. MacMillin

A new type of automatic iris control is incorporated in the Bell & Howell Design 290 8mm camera. The iris control is operated solely by power from a photovoltaic cell, made feasible by the exceptionally low power requirements of a unique rotary “barn-door” iris. The method of construction results in a highly shock-resistant mechanism with an almost unlimited service life. The automatic control is described and some of the design considerations discussed.

Print ISSN
Published
1958-09
Content type
Original Research
DOI
10.5594/J14462