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Proximity sensor

A technology of proximity sensors and detection coils, which is applied in the field of proximity sensors, can solve problems such as the impact of proximity sensors, and achieve the effect of reducing the impact

Inactive Publication Date: 2019-08-27
ORMON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, if the excitation current is periodically supplied to the detection coil as in the proximity sensor described in Patent Document 1, for example, if a periodic pulse generation source such as an inverter (inverter) is located nearby, if the pulse The period of the excitation current is consistent with the period of the excitation current, and the proximity sensor is affected by the noise generated by this pulse

Method used

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Embodiment Construction

[0042] Hereinafter, one embodiment (hereinafter also referred to as "this embodiment") of the present invention will be described with reference to the drawings. In addition, in each drawing, those denoted by the same symbols have the same or similar structures.

[0043] figure 1 A schematic block diagram of a proximity sensor according to this embodiment is shown as an example. Proximity sensor 100 is a proximity sensor that uses a magnetic field to detect objects, and includes, for example, detection coil 11 , auxiliary coil 12 , discharge resistor 13 , excitation circuit 20 , detection circuit 30 , control circuit 40 , and random number generator 50 .

[0044] The detection coil 11 is, for example, a coil having two terminals. An excitation current is supplied to the detection coil 11 from an excitation circuit 20 described later. The detection coil 11 generates a magnetic field according to the excitation current supplied to the detection coil 11 . In addition, the sid...

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Abstract

A proximity sensor (100) capable of reducing the influence of periodic noise is provided. A proximity sensor (100) according to an embodiment of the disclosure detects a detection object (200) using amagnetic field, and includes a detection coil (11) for generating the magnetic field, an excitation circuit (20) for repeatedly supplying a pulsed excitation current to the detection coil (11), a detection circuit (30) for detecting the detection object (200) based on a voltage generated across both ends of the detection coil (11) during a predetermined period after the supply of the excitation current is cut off, and a control circuit (40) for controlling the excitation circuit (20) so that a timing of cutting off the supply of the excitation current to the detection coil (11) becomes aperiodic.

Description

technical field [0001] The invention relates to a proximity sensor (sensor). Background technique [0002] A proximity sensor is disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2009-059528), which includes: a detection coil (coil), which generates a magnetic field; The excitation current; the detection circuit, according to the voltage generated at both ends of the detection coil after the supply of the excitation current is blocked, detects whether there is a metal object, etc.; and the control circuit. The control circuit controls the exciting circuit so that the supply period of the exciting current is equal to or longer than the supply blocking period of the exciting current. Thereby, fluctuations in the detection distance due to the thickness of the detection body can be suppressed. [0003] However, if the excitation current is periodically supplied to the detection coil as in the proximity sensor described in Patent Document 1, for example, when a peri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/20
CPCG01D5/2006H03K17/9502H03K17/9525H03K17/952H01H36/00G06F7/58G01V3/10
Inventor 冈本卓也中山祐辅土田裕之
Owner ORMON CORP