| 摘要 |
PURPOSE: To obviate the total reflection in spite of diagonal light at the joint surfaces of plural prisms consisting of double refractive optical crystals having a high refractive index by interposing an adhesive having a high refractive index consisting of a polyimide resin or bromophenyl compd. between the joint surfaces of the prisms. CONSTITUTION: This polarizing prism is formed by joining the plural prisms 1, 2 consisting of the double refractive optical crystals by the adhesive. The adhesive of the polarizing prism having a relation of n1 sinθ>=1.7 when the max. incident angle to be utilized among the incident angle distributions of rays on the joint surfaces is defined asθand the refractive index of the prism on the incident side as n1 is composed of the polyimide resin or bromophenyl compd. The polyimide resin of such high-refractive index joint layer 5 is high in refractive index and, therefore, even the light from diagonal is not totally reflected. The total reflection does not arise at the joint surfaces of exit surface of LN, the reflection of several % by the refractive index difference arises and, therefore, the prevention of the loss of energy by providing the polarizing prism with antireflection layers 4, 6 is effective.
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