Self-leveling system for optical distance measuring instruments
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United States of America Patent
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May 4, 1999
Grant Date -
N/A
app pub date -
Jun 15, 1998
filing date -
Jun 15, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
A system preferably in the form of an accessory module corrects for tilt angles of a distance measuring laser projecting instrument. The housing of the module includes a compensating mirror mounted on a pendulum which bends with tilt angle by one-half the amount of the housing tilt, so as to reflect the outgoing beam to truly horizontal. In a preferred embodiment a fixed mirror is also included so that the distance measuring instrument can be laid or held approximately horizontally so that its generally horizontal beam is first reflected by the fixed mirror up to the pendulous compensating mirror. The distance measuring instrument preferably has an internal correction to subtract the additional optical path length induced by the use of the accessory module. This may be activated by a switch on the module or automatically when the module is attached to the distance measuring instrument.
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