EP0357397A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Position sensing apparatus
Assignee: Individual
•
Filing: 1989-08-30
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Granted: —
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Expires: 2009-08-30
Abstract
Abstract A position sensing apparatus that can be used with a compatible digitising tablet to generate positional and rotational information. The apparatus contains two mutually perpendicular windings (10,14) which are fed with AC waveforms on phase quadrature. The magnetic field generated by these windings is detected by windings (12) in the digitising tablet. Alternatively, the perpendicular coils may be used to detect an externally generated magnetic field. A further winding (16) can be added to give positional information. All windings can be arranged in a disclosed manner, and incorporated into a hand held system.
Inventors
- 👤 Timothy Reid Craig
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 13:43
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/046; G06F2203/00; G06F2203/041; G06F2203/04101
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
116 words
A position sensing apparatus having a transmitting part comprising a first winding for generating a magnetic field; a receiving part, comprising a plurality of elongate windings which generate e.m.fs when subjected to the magnetic field originating from the transmitting part; and means for analysing the generated e.m.fs so as to provide positional information relating to the transmitting part; characterised in that: the transmitting part also has a second winding with the axes of the first and second windings being mutually perpendicular to a free axis, there being means to provide two AC waveforms in quadrature to activate the two windings, the analysing means being adapted to provide rotational information from the output of the receiving part.
Claim 2
Dependent Claim
116 words
A position sensing apparatus having a transmitting part comprising a first winding for generating a magnetic field; a receiving part, comprising a plurality of elongate windings which generate e.m.fs when subjected to the magnetic field originating from the transmitting part; and means for analysing the generated e.m.fs so as to provide positional information relating to the transmitting part; characterised in that: the transmitting part also has a second winding with the axes of the first and second windings being mutually perpendicular to a free axis, there being means to provide two AC waveforms in quadrature to activate the two windings, the analysing means being adapted to provide rotational information from the output of the receiving part.
Claim 3
Dependent Claim
116 words
A position sensing apparatus having a transmitting part comprising a plurality of elongate windings for generating a magnetic field; a receiving part comprising a first winding for generating an emf when subject to the magnetic field originating from th transmitting part; and means for analysing the generated e.m.f.s so as to provide positional information relating to the receiving part; characterised in that: the receiving part also has a second winding with the axes of the first and second windings being mutually perpendicular to a free axis, there being means to provide the transmitting apart with A.C. waveforms in quadrature, and the analysing means being adapted to provide rotational information from the output of the receiving part.
Claim 4
Dependent Claim
116 words
A position sensing apparatus having a transmitting part comprising a plurality of elongate windings for generating a magnetic field; a receiving part comprising a first winding for generating an emf when subject to the magnetic field originating from th transmitting part; and means for analysing the generated e.m.f.s so as to provide positional information relating to the receiving part; characterised in that: the receiving part also has a second winding with the axes of the first and second windings being mutually perpendicular to a free axis, there being means to provide the transmitting apart with A.C. waveforms in quadrature, and the analysing means being adapted to provide rotational information from the output of the receiving part.
Claim 5
Dependent Claim
31 words
A position sensing apparatus according to claim 1 or claim 2 having a further coil winding arranged with its axis parallel to the free axis, thereby to generate linear positional data.
Claim 6
Dependent Claim
24 words
A position sensing apparatus according to any one of the preceding claims wherein at least one of the windings is a single continuous coil.
Claim 7
Dependent Claim
30 words
A position sensing apparatus according to any one of claims 1 to 3 wherein at least one of the windings is a plurality of separate axially aligned electrically connected coils.
Claim 8
Dependent Claim
40 words
A position sensing apparatus according to any one of the preceding claims wherein the windings are fixed to a hand held device, part of which is arranged to make contact with a surface, the resolved rotation relating to that surface.
Claim 9
Dependent Claim
73 words
A position sensing apparatus according to claim 6 wherein the hand held device is elongate and the position of intersection of the longitudinal axis of the hand held device, which longitudinal axis corresponds to the free axis, and the axes of the winding, is adjustable in relation to the rest of the hand held device to control the resolved rotational error when the longitudinal axis is displaced from being perpendicular to the surface.
Claim 10
Dependent Claim
40 words
A position sensing apparatus according to any one of the preceding claims wherein the analysing means is arranged to demodulate and integrate the output of the receiving part of the resultant D.C. component being available for conversion to computer data.
Claim 11
Dependent Claim
38 words
A position sensing apparatus according to any one of the preceding claims wherein the analysing means is arranged to differentiate the output of the receiving part thereby to derive an angular velocity or angular acceleration of the windings.
References Cited (Backward Citations)
No citation records indexed.
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