| 摘要 |
A beam splitter includes a first prism member, a second prism member and a third prism member, each of which have a vertex end. The first prism is cemented to the second prism and the second prism is cemented to the third prism. The vertex end of at least one of the three prism members is truncated. Also disclosed is an optical head that includes the beam splitter for splitting a light beam from a recording medium. A detector detects the light beam split by the beam splitter.
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