| 摘要 |
An optical head is provided so as to include one prism having a wavelength separation function for reducing the number of steps for adjustment. The optical head includes a first light source, a second light source, a third light source and a beam splitter. The beam splitter includes a first prism, a second prism, a third prism, a fourth prism, a first optical film, a second optical film, a third optical film and a fourth optical film. The first to the fourth optical films have desired optical characteristics for allowing the light beam from the first light source that enters into the first prism and has a first wavelength, the light beam from the second light source that enters into the second prism and has a second wavelength and the light beam from the third light source that enters into the third prism and has a third wavelength to pass through or for reflecting these light beams.
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