| 摘要 |
PURPOSE:To improve transmittance of a pentagonal roof prism to laser light by subjecting a part of said prism to dichroic mirror coating and attaching a triangular columnar prism directly to said part. CONSTITUTION:The laser light and visible light reflected by a target passes an objective lens 3 and enters the pentagonal columnar prism 1, transmits the dichroic mirror coated on the triangular columnar prism 2 side by optical paths A B and enters the triangular columnar prism 2. The laser light passes the optical paths B, G in the prism 2 and enters a photodetector 9. The visible light is reflected by the dichroic mirror and is passed through the part having no dichroic mirror by the optical paths A B C D E from which the light enters the prism 2 and enters the eye through the optical paths E F. The reduction of the size over the entire part of the device is thereby reduced and the transmittance of the laser light is increased by about 30%.
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