| 摘要 |
PURPOSE:To obtain a perfect picture by photographing of once by providing a filter placed on a concentric circle of a rotary disk provided so as to cross an optical path extending from an object to a film surface, and a rotating mechanism. CONSTITUTION:A is a body whose object is an internal combustion chamber of an internal combustion engine, and a light emitting quantity is varied periodically in accordance with a rotation of a crank shaft B. A rotary disk 12 is provided so as to cross an optical path between a focus adjusting lens 3 and a field lens 4. Plural kinds of filters 13, whose light transmitting quantities are different from each other, are attached onto a concentric circle of the rotary disk 12. As for a revolving shaft 14 of the rotary disk 12, a pulley 15 is stuck as one body, and a pulley 16 is attached to the shaft B of the body A. While the shaft B makes one rotation, an ignition is executed once, therefore, the light emitting quantity of the body A is varied greatly. Accordingly, as for the filters 13, they are set so that the filter whose light transmitting quantity is small when the shaft B is at a position immediately before the ignition, the filter whose light transmitting quantity is large at the time of the ignition, and the filter whose light transmitting quantity becomes smaller little by little after the ignition are placed on the optical path, respectively. |
