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Detector

A sensor, measuring axis technology, used in electrical components, pulse technology, electronic switches, etc.

Inactive Publication Date: 2012-05-23
马克·A·霍华德
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure advantageously utilizes modern PCB technology and helical windings, however it also requires a central opening, multiple wafers, and a relatively complex winding geometry with excessive interconnections between individual wafers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] figure 1 A floor plan showing the buttons of the human machine interface. In this case the printer button is used as an example. A substantially impermeable, protective instrument panel 1 is printed with user instructions. The panel is formed by injection molding a glass-filled polymer, such as nylon. This panel protects the interior of the printer from the external environment for safety, hygiene and reliability. The user's finger 2 presses down on the panel 1 . The detector is located behind the button, but is not shown here for clarity. For clarity, figure 1 Only one button is shown, but there are usually several buttons provided on a keypad or control panel.

[0038] figure 2 A cross-sectional view of a preferred embodiment of the human machine interface button is shown, where the EID 3 is secured to the panel 1 by heat staking. Preferably, EID 3 is a ferrite or a conductive element such as a copper post. Any deflection of the panel 1 causes a displacement...

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PUM

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Abstract

A device for measuring the position of a first body relative to a second body comprising: a first body which further comprises an electrical intermediate device; a second body which further comprises at least two inductors energised with an alternating current and at least one of which is formed by a planar spiral winding on a printed circuit board normal to the measurement axis and attached to the second body; arranged such that displacement of the electrical intermediate device causes a change in inductance of the planar spiral winding and whereby measurement of the ratio of the inductancesindicates the position of the first body relative to the second.

Description

technical field [0001] The present invention relates to an inductive detector operable to measure the relative displacement of two or more objects having a specific, but not exclusive, relationship to a user element in a human-machine interface. Background technique [0002] Common user elements in position detectors or human-machine interfaces are buttons. Buttons typically detect user input by making or breaking electrical contact. In general, such buttons work well, but are prone to reliability issues in harsh environments where foreign objects such as water, condensation, dust or grease can interfere with electrical contact. This is especially problematic in certain environments, such as petrochemical plants or mines, where sparks from electrical contacts could cause an explosion. [0003] Capacitive detectors or switches have been used to overcome many of the problems associated with electrical contacts. In this type of switch, the change in capacitance caused by the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03K17/97
Inventor 马克・A・霍华德达兰・克赖特
Owner 马克·A·霍华德