Position measuring device for detecting displacements with at least three degrees of freedom
First Claim
1. Position measurement device comprisinga first and a second reference member, a plurality of springs extending between said first and second reference members in such a way that said second reference member is supported with respect to said first reference member entirely by said springs and is displaceable with respect to said first reference member with six degrees of freedom such that said springs change in length when said second reference member is displaced with respect to said first reference member, and measuring means connected to said springs, said measuring means being adapted to determine a relative position of said reference members in at least three degrees of freedom by measuring inductivities of said springs.
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Accused Products
Abstract
The invention comprises a fixed platform (1) and a displaceable platform (2) that are coupled by six tension springs (3) and an elastic spacing element (6), which forms with each platform, for instance, a ball-and-socket joint, so that the platforms can be displaced in a total of five to six degrees of freedom with respect to each other. Displacement is detected by measuring at the tension springs (3) or at the spacing element (6). This is preferably done by measuring the inductivity of the tension springs (3), thereby making it possible to easily determine the relative position of the platforms.
46 Citations
15 Claims
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1. Position measurement device comprising
a first and a second reference member, a plurality of springs extending between said first and second reference members in such a way that said second reference member is supported with respect to said first reference member entirely by said springs and is displaceable with respect to said first reference member with six degrees of freedom such that said springs change in length when said second reference member is displaced with respect to said first reference member, and measuring means connected to said springs, said measuring means being adapted to determine a relative position of said reference members in at least three degrees of freedom by measuring inductivities of said springs.
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9. Position measurement device comprising
a first and a second reference member, a plurality of extension springs extending between said first and second reference members in such a way that said second reference member is supported with respect to said first reference member entirely by said extension springs and is displaceable with respect to said first reference member with six degrees of freedom such that said extension springs change in length when said second reference member is displaced with respect to said first reference member, and measuring means connected to said extension springs, said measuring means being adapted to determine a relative position of said reference members in at least three degrees of freedom by measuring inductivities of said extension springs.
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14. Position measurement device comprising
a first and a second reference member, a plurality of springs extending between said first and said second reference members in such a way that said second reference member is supported with respect to said first reference member entirely by said springs, is suspended in an equilibrium position of said springs, and is displaceable with respect to said first reference member with six degrees of freedom such that said springs change in length when said second reference member is displaced from said equilibrium position, and measuring means connected to said springs, said measuring means being adapted to determine a relative position of said reference members in at least three degrees of freedom by measuring inductivities of said springs.
Specification