| 摘要 |
PURPOSE:To obtain always a finest copy with either of a silver salt film and a diazo film, by providing a photosensor which detects the optical information in the punched part of an aperture card and a controller which discriminates whether a silver salt film or a diazo film on receiving the output thereof and sets the copying conditions suited for the film. CONSTITUTION:An aperture card 12 is provided with punch holes 20 for identification purposes in the circumference of a film part 14, more preferably in the peripheral part of the card 12 and the circumference of the film part as shown in the figure. In the embodiment shown in the figure, silver salt type and diazo type are discriminated from the presence or absence of the punched holes. A photosensor 20, such as a phototransistor, is disposed in the part of a card bed 10 where the holes 20 are located when the card 12 is set correctly. The output thereof is fed to a detecting circuit 22. A control circuit 24 which receives the output of the circuit 22 controls the supply voltage or current or both thereof to a lamp so as to control the quantity of the light to be emitted by, for example, a light source, according to the kinds of films. |
