Ranco Inc. of Delaware

Ranco Inc.

Royal H Sites

Richard R Garcia

Lee A White

A temperature sensor and fabrication technique for making the sensor. An insulating substrate supporting a conductive resistive pattern is laser trimmed until the pattern has a desired resistance. Back and forth movement of the laser is controlled at an automated laser trimming station. The laser trimmer compares the sensed resistance of the conductive resistance pattern with a sensor pattern that has already been precisely trimmed to a desired resistance and is used as a standard.

Method of making a temperature sensor

A temperature sensor. Two thick films resistor elements are mounted to a substrate and then a thermistor coupled to those elements to form a voltage divider. The resistance of the thermistor is determined at a reference temperature and the thick film resistor elements are precisely trimmed using a laser trimming system to produce a precision voltage divider. To sense temperatures the voltage divider is energized and its resistance ratio is sensed utilizing a bridge circuit.

Temperature sensing apparatus and method of making same

A temperature sensor. Two thick film resistor elements are mounted to a substrate and then a thermistor coupled to those elments to form a voltage divider. The resistance of the thermistor is determined at a reference temperature and the thick film resistor elements are precisely trimmed using a laser trimming system to produce a precision voltage divider. To sense temperatures the voltage divider is energized and its resistance ratio is sensed utilizing a bridge circuit.

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Plano, TX, United States of America

Royal H Sites