Position determination device

Details Position determination device Position determination device

1982-02-01

1984-11-13

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

367156, 333148, G08C 2100

Patent

active

044827849

ABSTRACT:
A position determining device has two perpendicular longitudinal magnetostrictive elements. A grid of a plurality of closed loop conductors has two parallel straight legs which form the grid. A flux producing element inductively coupled to at least one of said grid conductors causes an electrical current in that conductor. In turn that current induces a strain wave in the magnetostrictive element. Near the end of the magnetostrictive element is a sensing means to detect the strain wave comprising a lumped inductive capacitive delay line substantially having a plurality of evenly spaced inductive coils aligned with the magnetostrictive elements.
The lumped delay line is defined by the formulas ##EQU1## where w is the overall length of the delay line; L is the total inductance, C is the total capacitance, Z is the terminating impedance, c is capacitance of the capacitance associated with each coil, and n is the number of coils.

REFERENCES:
patent: 4273954 (1981-06-01), Takeuchi et al.
patent: 4298772 (1981-11-01), Kobayashi et al.

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