APERTURE DIAPHRAGM DEVICE

摘要

PROBLEM TO BE SOLVED: To make an aperture diaphragm device equipped with an optical filter freely inserted in/pulled out from an optical path small in size and light in weight and to easily attach it to the lens barrel of a CCTV camera. SOLUTION: The diaphragm device is equipped with: a diaphragm base plate 10 having an aperture part 10a forming an optical path; two diaphragm blades 12 and 13 arranged to freely slide on one plate surface of the diaphragm base plate; a diaphragm driving device 20 driving the diaphragm blades; two kinds of two optical filters (infrared cut filter and dummy filter) 15 and 16 freely inserted in/pulled out from the optical path; and a filter driving device 30 removing either of two optical filters from the optical path when inserting the other of them in the optical path and removing the other of them from the optical path when inserting either of them in the optical path. The optical filters 15 and 16 are formed to be thin films and arranged on one plate side of the diaphragm base plate to freely slide along the diaphragm blades. COPYRIGHT: (C)2007,JPO&INPIT