| 摘要 |
<p>1,256,280. Flash exposure control. EASTMAN KODAK CO. March 27, 1969 [April 2, 1968], No.16036/69. Heading G2A. A pre-exposure flash sets the diaphragm for the main flash. The low-intensity pre-exposure flash is detected by the photo-resistive cell 1, the signal generated amplified at 2, the effect of the ambient illumination filtered out at 3, and galvanometer 4 deflected accordingly. The attached diaphragm vane 5 has a tapered aperture 8 which moves across the camera lens 9 from right to left, and is then retained in the set position by a pawl and ratchet arrangement 6, 7. The main flash exposure, whose intensity is a known multiple of that of the pre-exposure flash, is made immediately following. In the modification of Fig. 6 (not shown), the movement of the vane 5 at the same time actuates a rack and pinion arrangement which controls a focusing movement of the camera lens.</p> |
