EP0255772A2
Expired / Lapsed
EP
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Instrument with crossed-coil type movable magnet
Assignee: Nippon Seiki Co Ltd
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Filing: 1987-07-24
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Granted: —
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Expires: 2007-07-24
Abstract
Abstract An instrument has a crossed-coil-type movable magnet in which a movable magnet rotatable about the shaft of a pointer needle is installed in a crossed coil unit and a measured quantity or the like is operated by supplying electric power to the crossed coil unit. The instrument includes an input unit to receive an input from a measurement object to be measured, an arithmetic section or ROM to set directions and time values for supplying electric current to the coils of the crossed coil unit, and a circuit section to deliver pulse signals with predetermined potential values to the crossed coils under conditions associated with the directions and time values, to provide a very broad angular range of the pointer needle.
Inventors
- 👤 Seizou Tanaka
- 👤 Ryuichi Ando
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-10 00:47
CPC Classifications
G; G01; G01R; G01R7/00; G01R7/04; G01R7/06
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
87 words
A crossed-coil type instrument having a needle shaft rotated by a movable magnet shaft within a crossed-coil unit for measuring an input electrical parameter to be measured from a measurement object, comprising: input means for receiving said electrical parameter; means for setting current flow directions and time durations associated with said electrical parameter; means for generating output current pulses having a predetermined constant magnitude and directions and time durations determined by said setting means; and output means for applying said output current pulses to said crossed-coil unit.
Claim 2
Dependent Claim
87 words
A crossed-coil type instrument having a needle shaft rotated by a movable magnet shaft within a crossed-coil unit for measuring an input electrical parameter to be measured from a measurement object, comprising: input means for receiving said electrical parameter; means for setting current flow directions and time durations associated with said electrical parameter; means for generating output current pulses having a predetermined constant magnitude and directions and time durations determined by said setting means; and output means for applying said output current pulses to said crossed-coil unit.
Claim 3
Dependent Claim
25 words
The instrument of claim 1, wherein said setting means comprises a read only memory (ROM) having stored therein current flow direction and time duration data.
Claim 4
Dependent Claim
13 words
The instrument of claim 1, wherein said setting means comprises an arithmetic processor.
Claim 5
Dependent Claim
39 words
The instrument of claim 1, including: clock means for generating clock pulses having a fixed repetition rate; and counter means for counting said clock pulses generated by said clock means during a time duration corresponding to said electrical parameter.
Claim 6
Dependent Claim
22 words
The instrument of claim 1, wherein said output means includes logic gate means for supplying said current pulses to said crossed-coil unit.
Claim 7
Dependent Claim
57 words
The instrument of claim 2, including: clock means for generating clock pulses having a fixed repetition rate; counter means for counting said clock pulses generated by said clock means during a time duration corresponding to said electrical parameter; and comparator means responsive to outputs of said counter means and said ROM for generating said output current pulses.
Claim 8
Dependent Claim
15 words
The instrument of claim 1, wherein said crossed-coil unit comprises two coils crossing each other.
Claim 9
Dependent Claim
15 words
The instrument of claim 7, wherein said coils cross each other at a right angle.
Claim 10
Dependent Claim
23 words
The instrument of claim 1, including a pointer needle mounted on said pointed needle shaft for indicating information associated with the measurement object.
Claim 11
Dependent Claim
18 words
The instrument of claim 9, wherein said pointer needle has an angular range of up to 360 degrees.
Claim 12
Dependent Claim
98 words
In a crossed-coil type instrument having a needle shaft rotated by a movable magnet shaft within a crossed-coil unit for measuring an input electrical parameter to be measured from a measurement object, a method of driving the needle shaft in accordance with the input electrical parameter, comprising the steps of: measuring a characteristic of said electrical parameter; setting current flow directions and time durations associated with said electrical parameter; generating output current pulses having a predetermined constant magnitude and directions and time durations determined by said setting means; and applying said output current pulses to said crossed-coil unit.
Claim 13
Dependent Claim
98 words
In a crossed-coil type instrument having a needle shaft rotated by a movable magnet shaft within a crossed-coil unit for measuring an input electrical parameter to be measured from a measurement object, a method of driving the needle shaft in accordance with the input electrical parameter, comprising the steps of: measuring a characteristic of said electrical parameter; setting current flow directions and time durations associated with said electrical parameter; generating output current pulses having a predetermined constant magnitude and directions and time durations determined by said setting means; and applying said output current pulses to said crossed-coil unit.
Claim 14
Dependent Claim
26 words
The method of claim 11, wherein the setting step comprises addressing a read only memory (ROM) having stored therein current flow direction and time duration data.
Claim 15
Dependent Claim
27 words
The method of claim 11, wherein the setting step comprises calculating said current flow directions and time durations of said current pulses applied to said crossed-coil unit.
Claim 16
Dependent Claim
16 words
The method of claim 13, wherein said calculating step comprises making sinusoidal piecewise linear approximation computations.
Claim 17
Dependent Claim
13 words
The method of claim 13, wherein said calculating step comprises making sinusoidal computations.
Claim 18
Dependent Claim
83 words
In a crossed-coil type instrument having a needle shaft rotated by a movable magnet within a crossed- coil unit for measuring an input electrical parameter to be measured from a measurement object, means for receiving the electrical parameter: coil driving means responsive to said electrical parameter for applying an output current to said crossed-coil unit, said coil driving means including a read only memory (ROM) having stored therein coil drive current data and means repsonsive to said electrical parameter for addressing said ROM.
Claim 19
Dependent Claim
83 words
In a crossed-coil type instrument having a needle shaft rotated by a movable magnet within a crossed- coil unit for measuring an input electrical parameter to be measured from a measurement object, means for receiving the electrical parameter: coil driving means responsive to said electrical parameter for applying an output current to said crossed-coil unit, said coil driving means including a read only memory (ROM) having stored therein coil drive current data and means repsonsive to said electrical parameter for addressing said ROM.
Claim 20
Dependent Claim
86 words
In a crossed-coil type instrument having a needle shaft rotated by a movable magnet within a crossed-coil unit for meausirng an input electrical parameter to be measured from a measurement object, means for receiving the electrical parameter: coil driving means responsive to said electrical parameter for applying an output current to said crossed-coil unit, said coil driving means including an arithmetic processor means for generating a sinusoidal current as a function of said input electrical parameter and for applying said sinusoidal current to said crossed-coil unit.
Claim 21
Dependent Claim
86 words
In a crossed-coil type instrument having a needle shaft rotated by a movable magnet within a crossed-coil unit for meausirng an input electrical parameter to be measured from a measurement object, means for receiving the electrical parameter: coil driving means responsive to said electrical parameter for applying an output current to said crossed-coil unit, said coil driving means including an arithmetic processor means for generating a sinusoidal current as a function of said input electrical parameter and for applying said sinusoidal current to said crossed-coil unit.
Claim 22
Dependent Claim
23 words
The instrument of claim 17, wherein said sinusoidal current generated by said processor means is a piecewise linear approximation of a sinusoidal current.
References Cited (Backward Citations)
No citation records indexed.
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