| 摘要 |
An optical device is provided for obtaining a high-quality image based on light which has permeated a beam splitter. The optical device (101) is provided with a light receiving element (106) and the beam splitter (103). The light receiving element (106) has a sensitivity to light in a prescribed wavelength band. The beam splitter (103) is provided with a first plane (103a), which has an inclined angle to an incident light axis (104), reflects a part of luminous fluxes among the incident light in the prescribed wavelength band, and transmits other luminous fluxes to the light receiving element. The beam splitter (103) is also provided with a second plane (103-1b), which is formed to orthogonally intersect with the incident light axis, touching the first plane, and transmits the incident light in the prescribed wavelength band other than the incident light to the first plane to the light receiving element. A permeability of the second plane in the prescribed wavelength band is set so that when the light in the prescribed wavelength band from an object having actually uniform luminance distribution enters the first and the second planes, a light quantity distribution on the light receiving element is actually uniform.
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