| 摘要 |
<p>753,019. Photographic twin-lens cameras. DECKEL, H., and DECKEL, F. W. Jan. 19, 1954 [Feb. 25, 1953], No. 1600/54. Class 98 (1). A twin - lens camera having a lens shutter and shutter speed and stop aperture setting elements operated by setting means on the camera, means indicating the settings being provided, as characterized in that adjustable coupling means are provided between the speedsetting and aperture-setting elements; said coupling being adjusted in accordance with an integrated exposure value scale on one of the elements. As shown, setting discs 16, 18 having lugs 20 (Fig. 2, not .shown), 22 engaging with the shutter speed setting and stop adjusting levers and provided with gear sectors are adjusted by pinions 28, 30 on the shafts of rotatable knobs 24, 26 and adjust setting indicator dials 32, 34 on rotatable discs bearing gear sectors and mounted about the view-finding lens tube 14 of a twin lens camera. The speed setting disc 16 carries a scale 46 of exposure values visible through a window 48 in the diaphragm setting disc 18 and having a visible range of movement limited by a window 50 in the camera front of such extent that the chosen exposure value can be observed only for the range of diaphragm apertures available, while the speed and stop scales are visible in a window 40 in the top wall of the camera front. In alternative arrangements the exposure value scale is carried on an extension of the speed scale dial and is visible through a window in the top wall of the camera front of extent similar to the windows 50 and the chosen exposure value is indicated by either a window in an overlapping portion of the stop aperture dial or a fixed mark thereon. To ensure simultaneous complementary adjustments of'shutter speed and stop aperture the disc 16 has a series of recesses 42 engageable by a resilient lug 44 on the disc 18, the speed and stop scales being of uniform intervals and equal rotations of the discs involving equal and opposite variations in speed and aperture. Instead of a resilient lug on the disc 18, the lug may be rigid and the disc 16 axially displaceable against a spring ring by a plate on the bearing pin of the knob 26, either the pin or the knob as a whole being axially movable to effect relative movement between the discs. Specification 744,962 is referred to.</p> |
