| 摘要 |
1,273,427. Variable diaphragms. EASTMAN KODAK CO. July 25, 1969 [July 30, 1968], No.37404/69. Heading G2A. In order to limit the amount of light passing through the lens of a camera without using an excessively small diaphragm aperture, a filter mounted at the end of a masking arm is interposed in the light path. As shown, the diaphragm consists of a single vane 3 having a tapered opening. The vane is coupled to a pointer 6 and a coil 7, the coil forming part of a photo-electric lightmeasuring device, so that coil, pointer, and vane all move together. As the tapered opening moves across the exposure aperture 4 of the camera, the amount of light which can enter is varied accordingly. A masking member 5, whose movement about a pivot 11 is controlled by a button 9, cooperates with the diaphragm opening to define the exposure area, and the tip of the member 5 carries a small neutral density filter 10. |
