| CPC G03B 33/12 (2013.01) [G03B 21/008 (2013.01); G03B 21/204 (2013.01)] | 14 Claims |
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1. A prism block comprising:
a first prism that has a first surface, a second surface inclined with respect to the first surface, and a third surface connecting the first surface and the second surface;
a second prism that is located on a side of the second surface of the first prism, and has a fourth surface parallel to the first surface, a fifth surface that is located on the side of the second surface with respect to the fourth surface, and is inclined in a direction different from an inclined direction of the second surface with respect to the first surface, and a sixth surface connecting the fourth surface and the fifth surface;
a third prism that has a seventh surface facing the second surface via a gap and an eighth surface facing the fifth surface, and is located between the first prism and the second prism; and
an optical path separation coating that is located between the fifth surface of the second prism and the eighth surface of the third prism, wherein
illumination light incident on the third surface of the first prism is reflected by the second surface, and is emitted from the first surface,
projection light incident on the first surface of the first prism is emitted from the fourth surface of the second prism via the third prism,
imaging light incident on the fourth surface of the second prism is reflected by the optical path separation coating, and is emitted from the sixth surface, and
the imaging light includes the projection light reflected by a projection target, and is incident on the fourth surface of the second prism via a projection lens unit, is reflected by the optical path separation coating, is emitted from the sixth surface, and is received by an imaging element disposed on a side of the sixth surface.
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