| 摘要 |
PROBLEM TO BE SOLVED: To provide an image formation optical system capable of saving an image reformation optical system for CCD in a usual combined camera when a combined camera system of a video camera with a silver chloride camera, remarkably miniaturizing the combined camera system and excellent for optical performance. SOLUTION: This optical system is constituted so that luminous flux from an object is separated to reflection luminous flux and transmission luminous flux by a half mirror surface A having reflective diffraction power through a master lens 1, and the reflection luminous flux is total reflected by a surface B to be image-formed on a first image forming screen, and the transmission luminous flux is image-formed on a second image forming screen, and the main light of the luminous flux image formed on the first image forming screen center is made reference light, and the reference light made incident on the half mirror surface A and the reference light reflected by this surface are tilted each other. Then, when an angle between them is definedθ, theθis made to be satisfied with the conditional relation 5 deg.<=θ<=85 deg..
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