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US 6,684,487 B2Granted
Method of producing a load cell
AssigneeIshida Co., Ltd.
InventorsKazufumi Naito, Kenji Imai, Matsuo Zama, Naoki Sasaki
Life of this patent
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Abstract
A load cell is constructed with several strain gauges. Each of the strain gauges are formed with a meandering conductive portion on a substrate or base member. Portions of the meandering conductive layer defines a predetermined tab ratio. The base member is formed with a predetermined amount of filler and the tab ratio is pre-determined such that the creep characteristic of the strain gauge is substantially zero in a load cell having a generally low rated load.
Claims2
A method of producing a load cell comprising the steps of:
- forming a strain generating body having a strain generating portion;
- forming a base member from a mixture of a synthetic resin and a filler;
- adhering a metal foil onto the base member;
- forming a meandering pattern from the metal foil to define a strain gauge from the patterned metal foil and the base member;
- fixing the strain gauge on the strain generated portion of the strain generating body;
- and
- wherein the mixture of the synthetic resin and the filler of the base member is predetermined such that a creep ratio of the load cell is substantially zero.
4 more elements
Dependencies are inferred from the claim text.