| 摘要 |
PROBLEM TO BE SOLVED: To perform the cutting work of a polarizing and separating element material with small cutting position slippage by separating a polygonal prism- like member to be cut having a substantially trapezoidal section from at least one end of an optical element block to form a substantially parallelepiped polarization beam splitter array. SOLUTION: A plurality of translucent members 321 and 322 are stuck to dummy glasses 324L and 324R on the left and right. The resulting layered product is cut substantially parallel with a cutting surface having a prescribed angle to the surface, whereby an optical element block 320' is segmented. The acute angle parts on both ends of the thin parallelogram section of the optical element block 320' are cut substantially vertically to a light incidence surface 320i and an emitting surface 230o, whereby a substantially parallelepiped polarization beam splitter array is obtained. At this time, for example, the cutting position of a cutting edge 900 to cut the dummy glass 324L on the left end is at a position where the thickness directional center of the cutting edge 900 is located in the inside from the end of the incidence surface 320i by a prescribed distance W.
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