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Sensor

A sensor and capacitor technology, applied in the field of position sensors, can solve the problems of reduced output linearity, inconsistent period T, and deterioration of temperature performance

Inactive Publication Date: 2008-06-04
RIBEKKUSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However such a conventional position sensor has a disadvantage that the period T remains non-uniform due to temperature-related variations, including coil resistance variations, thereby degrading the temperature performance
[0004] Also, since the period T in conventional position sensors varies inversely proportional to the displacement of the object to be inspected, the linearity of the output is degraded

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0068] figure 1 is a schematic diagram showing the position sensor 100 according to the first embodiment of the present invention.

[0069] The position sensor 100 includes a displacement detector 30 , a pulse output module 40 , a voltage converter 60 , and an output converter 70 .

[0070] The displacement detector 30 includes a coil 1 and an electrical conductor 2 or a magnetic piece 3 .

[0071] The electrical conductor 2 or the magnetic member 3 is arranged relative to the coil 1 such that its overlapping length with the coil 1 varies according to the positional displacement of the object to be inspected.

[0072] Coil 1 may be a four-layer roll of 0.071-mm enamelled copper wire whose inner diameter is 2.3 mm and length is 22 mm, and has 1240 turns. The coil 1 may be housed in a stainless steel protective tube whose inner diameter is 3mm and outer diameter is 3.8mm.

[0073] The electrical conductor 2 or the magnetic piece 3 may be made of an aluminum tube having an inn...

no. 2 example

[0112] A second embodiment of the invention is arranged to produce an output voltage proportional to displacement. As described, the output voltage in the first embodiment is inversely proportional to displacement.

[0113] Figure 6 is a schematic diagram showing the position sensor 200a of the second embodiment.

[0114] The position sensor 200 a includes a displacement detector 30 , a pulse output module 40 , a timing circuit 50 a , a voltage converter 60 , and an output converter 70 .

[0115] The displacement detector 30 includes a coil 1 and an electrical conductor 2 or magnetic element 3 .

[0116] The electrical conductor 2 or the magnetic member 3 is arranged relative to the coil 1 such that its overlapping length with the coil 1 varies according to the positional displacement of the object to be inspected.

[0117] Coil 1 may be a 0.071-mm enamelled copper wire with an inner diameter of 2.3 mm and a length of 22 mm and a four-layer roll with 1240 turns. The coil ...

no. 3 example

[0161] The third embodiment of the invention is arranged to produce a desired output voltage level even when the time constant determined by the combination of coil 1, resistor 6, and capacitor 4 is much smaller than the period T of the clock signal CK. This may occur when the inductance of the coil 1 becomes lower due to size constraints. In this case, the output voltage may be lower in the second embodiment.

[0162] Figure 11 is a schematic diagram showing the position sensor 200b of the third embodiment.

[0163] The position sensor 200b is basically the same in arrangement as the position sensor 200a of the second embodiment except for the timing circuit 50b.

[0164] The timer circuit 50 b includes an oscillator 51 , a flip-flop 52 , an AND circuit 53 , a buffer 54 , and a counter circuit 56 .

[0165] The buffer 54 in the timing circuit 50b is connected at its output port to the other end of the series circuit consisting of the coil 1 and the resistor 6 .

[0166] ...

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Abstract

A position sensor is provided comprising a coil (1) and an electric conductor (2) or magnetic (3) both arranged so that the size of their overlapping area (p) is varied as the position of an object to be examined changes, a resistor (6), a capacitor (4), a comparator (5) of an inverse output type, and a timing circuit (50a) arranged for uniformly restraining the period (T) of a continuous oscillating motion, herein a displacement of the object to be examined is detected as a change in the time duration (t) which extends from the leading end of the period (T) to a time when the output of the comparator (5) is turned to a high level as timed with substantially the trailing end of the period (T). The resistance of the resistor (6) is determined so that a change in the time duration (t) remains minimum when the resistance of the resistor (6) is varied and when the temperature is at a predetermined degree. As the result, the linearity of the output can be improved over variation of both the temperature and the position.

Description

technical field [0001] This invention relates to a position sensor and, more particularly, to a position sensor which is improved both in temperature performance and in the linearity of its output with respect to the displacement to be measured. Background technique [0002] A known conventional position sensor comprises a coil and a magnetic member both arranged such that the size of their overlapping area varies with the position of the object to be inspected, a resistor connected in series with the coil and a capacitor arranged across the coil and a series circuit of a resistor for charging and discharging, and a comparator arranged as an inverse output (inverse output) type so as to receive the charging voltage of the capacitor as an input, and when the output is at a high level, charging of the capacitor is performed, and When the output is at low level, the discharge of the capacitor takes place, wherein the displacement of the object is detected as a change in the per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/20G01D3/028G01D3/036
CPCG01D5/2013G01D3/028G01D5/2006G01D5/202G01D3/036G01D2205/776G01D5/20
Inventor 户田成二押柄直正
Owner RIBEKKUSU
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