Optical apparatus including diaphragm device

Details Optical apparatus including diaphragm device Optical apparatus including diaphragm device

2006-08-15

2009-11-03

Whittington, Kenneth J (Department: 2858)

Photography

Camera detail

Diaphragm

Reexamination Certificate

active

07611296

ABSTRACT:
A lens apparatus includes a lens barrel, an image-capturing optical system, and a diaphragm device disposed in an optical path of the image-capturing optical system. The diaphragm device includes a plurality of diaphragm blades and an electroactive polymer actuator configured to move the plurality of diaphragm blades from a diaphragm-open state to a diaphragm-closed state and from a diaphragm-closed state to a diaphragm-open state.

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patent: 2006/0142634 (2006-06-01), Anstadt et al.
patent: 3501216 (2001-10-01), None
Electroactive Polymer (EAP) Actuators as Artificial Muscles, 2nd Ed., 2004, SPIE Press, p. 566.
Pei et al., Multifunctional Electroelastomer Rolls, Mat. Res. Soc. Symp. Proc. vol. 698, 2002, pp. EE4.8.1-EE4.8.6.
Yoseph Bar-Cohen, Electroactive Polymer (EAP) Actuators as Artifical Muscles, book, 2004, pp. 22-31, pp. 535-539, The Society of Photo-Optical Instrumentation Engineers, United States of America.
John D. W. Madden, Artificial Muscle Technology: Physical Principles and Naval Prospects, IEEE Journal of Oceanic Engineering , Jul. 2004, vol. 29 No. 3, pp. 207-728, IEEE, United States of America.
Steven Ashley, Artifical Muscles, Scientific American, Oct. 2003, Scientific American, Inc., United States of America.

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