| 摘要 |
An automatic plumb, level and pointing tool (75) uses a visible laser diode (80) to project light beams (100, 102) in two modes through two windows (98, 121). In the first mode of operation, the unit is able to project a plumb-up beam and a level beam of light while resting on a surface which is as much as five degrees out of level. In the second mode of operation the unit is able to project two orthogonal beams of light both approximatively in the horizontal plane for aligning one or more reference lines. An accurate, low cost method of generating level and plumb beams and planes of light is disclosed. One method uses an approximately leveled platform (82) combined with a weak optical correction. The approximate leveling is done using a single wire (104) or coil spring (145) pendulum element which allows the platform to level itself to within a small fraction of true level, and remaining correction is provided by weak negative lens (94, 114), a weak reverse telescope (718, 720) or optical refraction at a liquid/air interface (805). An accessory (280) is disclosed for use with the laser tool.
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