Water proof electronic digital display callipers

Abstract

A water-proof electronic caliber rule with digital indication is composed of displacement measuring device consisting of electric eddy sensors, metallic reflectors uniformly arranged on fixed rule by a certain wavelength, and several sensor coils installed on moving rule by a particular pitch. When an alternative current flows through said coils, an alternative magnetic field is generated in space to generate an electric eddy on said reflector. When fixed and moving rules move relatively, the magnetic field is modulated under the action of electric eddy, so measuring displacement value.

Description

Technical field:

[0001] The invention relates to a waterproof electronic digital caliper, which is one of the conventional necessary tools in departments such as machining, measurement testing, on-line testing, and product inspection, and belongs to the technical field of measuring instruments. Background technique:

[0002] Electronic digital caliper is a measuring tool widely used in the industrial field. The traditional electronic digital caliper has a series of advantages such as stable performance, convenient use, low price, and long continuous working time, but at the same time there is an obvious shortcoming and deficiency: when there is liquid in the use environment, the caliper display value will have a large deviation , or even not work at all. This defect largely affects the use of electronic digital calipers in production and processing sites, and limits the further popularization and application of digital calipers in other fields.

[0003] At present, some el...

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