Automatic compensator for compensating collimation error due to two-directional inclination in surveying instruments
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United States of America Patent
Stats
-
Jul 21, 1987
Grant Date -
N/A
app pub date -
Dec 10, 1985
filing date -
Dec 18, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical plummet mechanism for compensating an error due to an inclination of a surveying instrument comprises a first pendulum suspended in the instrument body interior, a second pendulum suspended in a perpendicular relation to the first pendulum, a first reflector provided on the first pendulum for reflecting light incident in the direction of a collimation axis of a collimation lens in the direction of a substantially horizontal collimation axis lying in the plane of swinging of the first pendulum, and a second reflector provided on the second pendulum and being a double reflecting surface reflector for reflecting light incident in the direction of a collimation axis lying the the plane of swinging of the first pendulum in the direction of a vertical collimation axis. Collimation errors due to inclination of the instrument body in two directions, i.e., back-and-forth direction and left-to-right direction, can be simultaneously automatically compensated for by the pendulum actions of the first and second pendulums in perpendicular directions.
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