| 摘要 |
PURPOSE:To prevent effectively a fact that moire fringes are generated on a photographed image by constituting a titled device so that influence caused by an array of a fiber can be eliminated, by using a double refraction element. CONSTITUTION:A double refraction element 19 selects the thickness of a plate surface to a suitable value in accordance with the size of a double refraction, and also rotates the plate surface, by which, for instance, an optical image O of a fiber 18A, which is formed on the film surface by an ordinary ray, and an optical image E of the fiber 18A, which is formed by an abnormal ray are shifted to about a radius of the fiber 18A. Also, to the part where an image of a dark part which is not the fiber 18A by the abnormal ray is made to coincide and fixed. In this way, the difference in contrast of light and darkness between a bright image and an image of a dark part of the part of the fiber 18A is eliminated, and even if a structure such as stripes, etc. exists in the film side, moire fringes are scarcely generated. |
