Position detection device

A technology for detection devices and detection objects, which is applied in the directions of measuring devices, electromagnetic measuring devices, electric/magnetic position measurement, etc., and can solve problems such as unformed detection

Active Publication Date: 2014-08-20
AMITEQ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the conventional self-excited oscillation type proximity sensor has a structure suitable for detecting fluctuations in the oscillation frequency, but has not formed a structure capable of detecting the position of the detection object based on the amplitude level of the oscillation output signal.

Method used

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Embodiment Construction

[0027] exist figure 1 In the position detection device according to one embodiment of the present invention, the coil part (coil 4 ), which is one type of position detection element, is incorporated in the self-excited oscillation circuit 10 as a variable inductance element, and by self-excited oscillation for excitation. In this embodiment, the coil unit is composed of one coil 4 . That is, since there is no special (dedicated) AC oscillation source or no need to supply an excitation AC signal from outside, the circuit configuration can be considerably simplified. The coil 4 is constituted by, for example, a flat coil formed in a spiral shape on a printed circuit board. Such a flat coil contributes to miniaturization of the device structure. In this case, the flat coil 4 may be formed by connecting a plurality of flat coil parts stacked in layers and connected in series. Inductance can thereby be increased. In addition, the coil 4 is not limited to a flat coil, and may b...

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Abstract

The present invention includes a detection coil (4) in a self-oscillation circuit (10) in a position detection device. The oscillation frequency of the self-oscillation circuit (10), which is configured from the coil (4) and a capacitor, is set to a high frequency band (for example, around 1 MHz or higher). A target section (3) of which the relative position with respect to the coil (4) changes in accordance with the displacement of a detection subject comprises a magnetically responsive member configured in a manner so as to change the inductance of the coil (4) in accordance with the relative position. A rectifier circuit (21) extracts the amplitude level of the oscillation output signal of the self-oscillation circuit (10) and outputs the result as position data of the detection subject. As an example, a plurality of self-oscillation circuits (10a, 10b) are provided. As a separate example, a single self-oscillation circuit (10) forms a plurality of series circuits by, for every pair of a plurality of coil pairs, connecting in series the two coils (4a, 4b) configuring the coil pair, and includes the result of connecting the series circuits in parallel as an inductor element for self-oscillation.

Description

technical field [0001] The present invention relates to a position detection device comprising a structure in which a coil as a detection element is assembled as an inductance element of a self-excited oscillating circuit, and to a position detection device comprising a coil on a printed circuit board in a spiral shape. The formed flat coil is used as the detection element and the inductance element is assembled as the self-excited oscillation circuit. It can be applied to any type of position detection such as micro-displacement detection devices, linear position detection devices, rotational position detection devices, and tilt detection devices. . Background technique [0002] There are known various types of position detection devices using a coil (inductance element) as a detection element. Among the various position detection devices described above, there is exclusively an AC signal source for coil excitation, and the coil is AC excited by applying an AC signal gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60K20/02G01B7/00
CPCG01D5/2006G01D5/243G01B7/003G01R27/2611G01D5/2216G01D2205/73
Inventor 后藤忠敏后藤太辅坂元和也坂本宏汤浅康弘
Owner AMITEQ
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