| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a beam splitter capable of effectively preventing separation of adhesives by adopting the configuration in which an inter-joining surface between one prism substrate and the other prism substrate is removed from the apex angle part of the beam splitter, which allows an optical multilayer to be formed and makes an edging of the outer circumference to support it thick enough to minimize warpage of the substrate. <P>SOLUTION: A cube type beam splitter composed of two prisms comprises one prism substrate 11 consisting of pentagon prisms and the other prism substrate 12 consisting of triangular prisms each having a joining surface parallel to a surface including two countervailing diagonal lines of the prism of a cross section square. The optical multilayer 14 is deposited on the joining surface of the pentagonal prism, and the two prisms are jointed by an adhesive layer 13 through the optical multilayer 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
