To miniaturize an entire camera by providing an arranging means arranging an elastic member possessing an aperture formed to surround an optical axis at the diaphragm part of the camera and having light shielding property and an adjusting means adjusting the aperture of the elastic member by air or fluid pressure so that the diameter of the aperture may be large or small.
Both ends of the elastic member 20 having the light shielding property and functioning as a diaphragm are integrated with glass plates 14 and 15 functioning as the arranging means and attached in the interior of a lens barrel 11. At such a time, both ends are fixed on the inside of the lens barrel 11. An air injection port 18 constituting the adjusting means is formed on the lens barrel 11, so that the air between the inner surface of the lens barrel 11 and the outer surface of the elastic member 20 on the periphery of both ends of the member 20 can be injected and discharged. Therefore, when the air is injected from the injection port 18, the member 20 is deformed and pushed out toward the inner periphery side of the lens barrel 11 to narrow a light introducing path. On the contrary, when the air is discharged from such a state, the member 20 is restored by the elastic force to largely open the light introducing path.
KIMURA MASANOBU
HOSOKAWA JUNICHI
TOSHIBA AVE KK