Electro-optical distance meter
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United States of America Patent
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May 4, 1993
Grant Date -
N/A
app pub date -
Apr 29, 1992
filing date -
Apr 29, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An electro-optical distance meter has a light-emitting element that is directed through a shutter to a target and returned from the target to a photodetector. Internal and external optical paths are continuously switched by the shutter with a predetermined time ratio. The internal optical path is used for calibrating the distance being measured. The meter reduces the measurement time and enhances accuracy. In one form, the shutter comprises a disc having a C-shaped opening with an index thereon for providing a reference signal. In another form, the shutter comprises a liquid crystal switch.
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