| 摘要 |
A prism system is utilized in tricolor separation in order to obtain three images of separated colors by passing through the prism a light beam from a single objective lens system. The prism system includes first, second and third prisms, each having the same refractive index. First and second interference filters are utilized in conjunction with the prisms in order to provide reflecting lights and transmitted lights that are complementary to each other. The first prism is a right-angled triangular prism having a vertical angle of 30 DEG , with its oblique surface being disposed at a right angle to the optical axis of the objective lens system. The second and third prisms are each of a trapezoidal shape, having the identical size. Two adjoining angles of the trapezoidal prisms are 90 DEG and the other two angles are 60 DEG and 120 DEG , respectively as viewed in their cross sections. The second prism has a bottom surface which is bonded through the medium of the first interference filter to the base surface of the first prism. The oblique surface of the third prism being bonded through the second interference filter to the oblique surface of the second prism, with the top and bottom surfaces of the third prism being in parallel with the optical axis.
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