Geometrical instruments – Straight-line light ray type – Level
Reexamination Certificate
2008-07-08
2008-07-08
Fulton, Christopher W (Department: 2859)
Geometrical instruments
Straight-line light ray type
Level
C033S702000, C033S366110
Reexamination Certificate
active
07395604
ABSTRACT:
A laser level with temperature control device (2) and the temperature control method thereof are disclosed. The temperature control device includes a thermal insulation chamber (22), a thermoelectric cooler (25), a control unit (21), and first and second temperature sensors (23, 24). The second temperature sensor is received in the thermal insulation chamber together with a tilt sensor (12). The control unit controls operation of the thermoelectric cooler according to the external and internal temperature signals respectively output by the first and second temperature sensors, so as to adjust the internal temperature inside the thermal insulation chamber to be a calibration temperature point close to the external temperature. Accordingly, the temperature drift problem can be addressed, and the working temperature of the tilt sensor can be maintained in a stable range. Further, the acceptable ambient temperature range within which the tilt sensor works can be expanded.
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Chen Yue-ye
Chien Pie-Yau
Jian Zhang-yong
Li Yi-qi
Liu Hua-tang
Asia Optical Co. Inc.
Fulton Christopher W
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