| 摘要 |
In a cross dichroic prism wherein four square pillar prisms of which the total of the angles including the prism ridge lines is 360° are joined together with the prism ridge lines thereof made coincident with one another and prism sides forming the respective prism ridge lines are joined together so that the joined surface thereof may become two planes intersecting with each other, and dichroic film is provided on the joined surface, when the lengths of perpendiculars from a point on the prism ridge line to the non-joined surfaces of the respective square pillar prisms are defined as L1, L2, L3 and L4,is satisfied.
|
