1534276-A is referenced by 14 patents.

1534276 Force transducers EMI Ltd 2 Feb 1976 [1 Feb 1975 (2)] 4465/75 Heading G1N A force transducer includes a planar element in the form of a beam 6 with strain-sensing resistors 1-4 on its upper surface on reduced thickness portions 7, and having parallel limbs AD, BC and a re-entrant portion between them for application of a force at P, which portion projects into a central aperture. In use the beam is clamped along the edge AB and flexes substantially only in the portions 7 of reduced thickness (as shown in Fig. 2) where resistors 1, 2 are strained in the opposite sense to resistors 3, 4, these resistors being connected in a Wheatstone bridge circuit. In an alternative embodiment Piezo resistors 3-10 are provided on a semi-conductor beam 1 by differential doping.; The beam is rigidly mounted along its edge AB and a force applied vertically downwards at P produces flexing at the reduced thickness areas 2 whereby resistors 5,6,7,8 are strained in the opposite sense to 3,4,9,10. In a further embodiment the parallel limbs and re-entrant portion each have four sections of reduced thickness and associated strain gauges, four gauges on each parallel limb and eight on the re-entrant portion, which is double the width of each parallel limb.

Title
Force transducers
Application Number
GB19750004465 19760202
Publication Number
1534276 (A)
Application Date
February 2, 1976
Publication Date
November 29, 1978
Assignee
Emi
IPC
G01L 01/22
G01L 01/20
G01L 01/22
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