Multifunction coaxial objective system for a rangefinder
US5329347A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1992 |
| Grant date | Jul 12, 1994 |
| Priority date | — |
| Expiry date | Sep 16, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B17/0824
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
There is provided a multifunction coaxial objective system (16) for a laser rangefinder (10). The transmitter, receiver, and viewing optical systems have a common, coaxial optical axis (48). The multifunction coaxial objective system (16) includes lenses (28), (30) and mirror (32) each having a central obscuration therein. The multifunction coaxial objective system (16) further includes a lens (34) having a dichroic coating on one surface (50). The dichroic coated lens (34) transmits visible and near infrared light and reflects light of the wavelength transmitted by a laser emitter (18). The viewing optical system includes a pair of focusing wedges (42), (44) for adjusting the focus of the viewing optical system. Each focusing wedge (42), (44) is a wedge-shaped optical flat. The pair of focusing wedges (42), (44) are disposed against one another along a plane inclined with respect to the coaxial optical axis (48) of the multifunction coaxial objective system (16). Focus adjustment is achieved by relative movement between the focusing wedges (42), (44) along the inclined plane. The multifunction coaxial objective system (16) of the present invention may alternatively be incorporated…
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