| 摘要 |
PURPOSE:To enable program control to be performed with a simple device by drawing out 1/n of the voltage corresponding to an exposure value, controlling aperture with this 1/n voltage and controlling shutter with the voltage of the remaining (n - 1)/n. CONSTITUTION:With an aperture 1 being held open, the light from the object is measured with a photosensor 2. This exposure measurment at open aperture causes the voltage corresponding to the luminance value to be stored in a memory 4 when a release button is half pushed. On the other hand, an exposure valve is calculated by luminance value from the memory 4 and the film sensitivity value from a buffer circuit 6 and is divided to 1/2. The aperture 1 is stopped down until the output voltage of the photometric circuit 3 coincides with this voltage of 1/2. Following this, the shutter second time is controlled according to the remaining voltage of 1/2. In this way, the program controlling of the aperture and sutter priority camera may be accomplsished with the simple device. |
