| 摘要 |
<p>PURPOSE:To efficiently and rationally check objects to be observed on different scales by porjecting the object to be observed always on the same scale within physical tolerance of projector. CONSTITUTION:Where M is a scale factor of a positive film F obtained from a film on which a reinforced concrete floor plate (RC floor plate) is photographed, (m) is a magnification inputted by a projector controller 3, and K is a magnification of a picture projected on a screen 12, the magnification K is expressed by formula IOTA. Where (a) is a distance between the object (RC floor plate) and the camera lens, and (b) is a distance between the camera lens and the film, the scale factor M of the photographic film, that is, the positive film F is expressed by formula IOTAIOTA. The picture of the object to be observed is projected on the screen 12 always on the same scale, by using the formula IOTAto find the magnification (m) which is inputted by the projector controller 3, and by inputting the value to the projector controller 3. Thus, the RC floor plate can be efficiently and rationally checked.</p> |
