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US 5,287,630 AGranted
Distance or position detecting device
AssigneeHottinger Baldwin Messtechnik GmbH
InventorPeter Geisler
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AssigneeHottinger Baldwin Messtechnik GmbH
InventorPeter Geisler
Estimating the term…
A distance or position detecting device has a movable member forming a measuring ruler and a detector in the form of a primary coil and a plurality of secondary coils forming together a stationary member. The measuring ruler is movable coaxially inside a hollow core of the primary coil. The measuring ruler is made of a plurality of sections alternating with one another along the length of the ruler, whereby these sections have different discernible characteristics, for example, magnetic characteristics and nonmagnetic characteristics. The individual ruler sections are assembled along the length of the ruler in such a manner that a respective limited number of neighboring ruler sections are arranged in an encoded form so that the encoding provides an absolute position indication. Such a structure is simple and hence cost effective in any of its operational states. An accurate and absolute position indication is thus possible.
A distance and position detecting device for providing a position information signal representing a distance or a position of a movable member relative to a stationary member, comprising hollow detector means forming said stationary member for detecting position information, said movable member consisting of a single movable measuring ruler which is movable into and out of said hollow detector means for generating said position information in said hollow detector means, said single movable measuring ruler consisting of a single row of ruler sections along its length having discernible different characteristics along said length of said single movable measuring ruler, so that said different characteristics of a limited number of neighboring ruler sections together provide an encoding which represents said position information signal in the form of an absolute position indication, whereby said movable measuring ruler itself is a measuring scale for an absolute measurement without any reference marker.
A distance and position detecting device for providing a position information signal representing a distance or a position of a movable member relative to a stationary member, comprising light detector means forming said stationary member for detecting position information, light source means arranged alongside said light detector means with a spacing, said movable member consisting of a single movable measuring ruler which is movable into and out of said spacing for generating said position information in said detector means, said single movable measuring ruler consisting of a single row of opaque ruler sections (1A) and of light transparent ruler sections (1B) along its length thereby providing discernible different characteristics along said length of said measuring ruler, so that said different characteristics of a limited number of neighboring ruler sections together provide an encoding which represents said position information signal in the form of an absolute position indication, whereby said movable measuring ruler itself is a measuring scale for an absolute measurement without any separate reference marker.
Dependencies are inferred from the claim text.