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Probe 1 senses unwanted protruding recessed heads H of the input/output (I/O) pins P affixed in a ceramic substrate S.
English (United States)
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Height Sensor Electric Probe
Probe 1 senses unwanted protruding recessed heads H of the input/output
(I/O) pins P affixed in a ceramic substrate S.
Probe 1 has an elongated cylindrical conductive member 2 with an insulated
collar 3 flush mounted with the end surface 4 of member 2. The outer diameter
of member 3 is judiciously selected to straddle the recessed opening 0 of
substrate S when resting on substrate surface F. Pin P and member 2 are
connected to a sensing circuit shown schematically as power source PS and
In operation, any head H beneath surface F does not contact member 2,
thereby maintaining the sensing circuit PS/M in an open circuit condition, which is
indicative of a properly recessed head H. If, on the other hand, the head H
extends above surface F, the pin P and member 2 are placed in contact,
resulting in a closed circuit condition. In response, meter M under this condition
provides an indication that the particular head H being sensed is protruding.