Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1997-10-03
2000-01-11
Lee, Benjamin C.
Communications: electrical
Condition responsive indicating system
Specific condition
340596, 340680, 216 60, 165 61, 219385, 219506, 29 2501, 118666, 118725, 20429803, G08B 1700
Patent
active
060140828
ABSTRACT:
A system coupleable to a heated wafer chuck control system provides an indication that the heated wafer chuck is operating at a temperature outside of a desired operational temperature range for the chuck. The system comprises: an operational temperature circuit for generating an operational temperature limit signal. The operational temperature limit signal is reflective of a selected operational temperature limit for a heated wafer chuck. An input circuit configured for coupling to a heated wafer chuck control system provides a chuck temperature signal which is reflective of the actual measured temperature of the heated chuck. A comparator circuit coupled to the operational temperature circuit and the input circuit compares the operational temperature limit signal to the chuck temperature signal and provides an output signal. Depending upon the output signal, an indicator generates a humanly-perceptible indication of the chuck temperature status in response to said output signal, and an interface circuit controls other aspects of the system for turning the chuck OFF. The system includes circuitry for verifying and calibrating the operation of the control board for the heated chuck.
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Lee Benjamin C.
Sony Corporation
Sony Electronics Inc.
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