KR20170044483A - Sensing Apparatus for Approach of Object - Google Patents
Sensing Apparatus for Approach of Object Download PDFInfo
- Publication number
- KR20170044483A KR20170044483A KR1020150144251A KR20150144251A KR20170044483A KR 20170044483 A KR20170044483 A KR 20170044483A KR 1020150144251 A KR1020150144251 A KR 1020150144251A KR 20150144251 A KR20150144251 A KR 20150144251A KR 20170044483 A KR20170044483 A KR 20170044483A
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- Prior art keywords
- oscillator
- oscillation frequency
- frequency
- phase
- sensor strip
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
- G01R27/2605—Measuring capacitance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
- G01R23/12—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage by converting frequency into phase shift
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/22—Electrical actuation
- G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit
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- General Physics & Mathematics (AREA)
- Electronic Switches (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The present invention relates to an object proximity sensing device.
According to an aspect of the present invention, there is provided a sensor device comprising: a sensor strip having a shape in which a capacitance value changes according to an approach of an object and in which a band-shaped conductor is inserted; and a sensor connected to the sensor strip, A phase control unit that is provided between the sensor strip and the RF oscillator and controls a phase of a power supply waveform applied to the sensor strip; and a control unit connected to the RF oscillator, Controlling the RF oscillator to maintain the reference oscillation frequency when the oscillation frequency of the RF oscillator changes from the reference oscillation frequency according to the change of the capacitance value and controlling the oscillation frequency by at least two reference oscillation frequencies A phase locked loop unit coupled to the phase locked loop unit, wherein the RF oscillator outputs a reference oscillation frequency The object proximity detection device comprising the MCU to determine whether access of an object by using the electric signal received from the phase lock loop portion, while the additional control the phase-locked loop is started to.
Description
The present invention relates to an object proximity sensing device, and more particularly, to an object proximity sensing device that includes a sensor strip having a variable capacitance value according to an approach of an object and an RF oscillator connected to the sensor strip, The present invention relates to an object proximity sensing apparatus which is provided with a phase control means and is constructed such that a frequency oscillation frequency is controlled by at least two reference oscillation frequencies of an RF oscillator, thereby preventing a detection error problem due to a dead point of the sensor strip.
In general, the object proximity sensor is divided into contact type and non-contact type. The contact type is a method to judge whether an object is approaching by detecting a change of an electrical load or a change of an air pressure caused by an object such as an obstacle, and a non-contact type is a method of changing a capacitance, a change of a magnetic field or an electric field To determine whether or not the obstacle is approachable.
As shown in the schematic configuration diagram of FIG. 1, the electrostatic capacitance type obstacle sensing apparatus according to a conventional example includes a
The electrostatic
The
The
The
The capacitance of the
However, such a conventional object proximity sensing apparatus has a problem in that a point (hereinafter, referred to as 'dead point') at which an object can not be detected even when the object approaches it is periodically displayed on the sensor strip.
Experiments have shown that dead points appear at intervals of approximately 14 cm when using a 900 MHz RF oscillator and dead points appear at intervals of approximately 28 cm when using a 450 MHz RF oscillator.
As an example of a conventional technique for solving such a problem, in Korean Patent Registration No. 10-0947559 (Mar. 3, 2010), at least two RF oscillators are used to oscillate a plurality of frequencies alternately in a predetermined period, And the dead point does not overlap according to the adjustment of the other frequency, thereby solving the problem of the inability to detect due to the dead point.
However, in the case of using two or more RF oscillators, the use of two or more oscillation circuits makes the circuit complex, and there is a problem that the probability of failure increases with the use of two oscillation circuits. Also, when the two oscillation circuits have the same phase, there is a problem that a dead point can theoretically occur at intervals of, for example, 28 cm.
On the other hand, a configuration in which the oscillation frequency itself of the RF oscillator is set to a relatively low frequency (for example, 10 MHz) may be considered. However, in this case, there is a problem that sensitivity to object detection of the sensor strip is deteriorated.
It is an object of the present invention to solve the above problems in the prior art, and it is an object of the present invention to provide an apparatus and a method for measuring a capacitance between a sensor strip having a variable capacitance value and an RF oscillator connected thereto, There is provided an object proximity sensing device which is provided with a phase control means and is configured such that a frequency oscillation frequency is controlled by at least two reference oscillation frequencies of an RF oscillator, thereby preventing a detection error problem due to a dead point of the sensor strip .
According to an aspect of the present invention, there is provided a sensor device comprising: a sensor strip having a shape in which a capacitance value changes according to an approach of an object and in which a strip-shaped conductor is inserted; A phase control unit provided between the sensor strip and the RF oscillator and controlling a phase of a power supply waveform applied to the sensor strip; And controls the RF oscillator to maintain the reference oscillation frequency when the oscillation frequency of the RF oscillator is changed from the reference oscillation frequency in accordance with the change of the capacitance value, A phase locked loop unit for controlling the frequency of the phase locked loop unit; And an MCU for determining whether the object is approachable by using an electrical signal received from the phase locked loop unit while the phase locked loop unit is controlling the F oscillator to maintain the reference oscillation frequency, Lt; / RTI >
Preferably, the phase locked loop unit includes: a variable capacitance diode connected to the RF oscillator; and a control unit, which is controlled by the MCU, continuously detects an oscillation frequency of the RF oscillator through a frequency sensing unit, The oscillation frequency of the RF oscillator is maintained at the reference oscillation frequency by supplying a frequency adjustment voltage to the variable capacitance diode through a frequency adjusting signal line when the oscillation frequency of the RF oscillator changes from the reference oscillation frequency, And a phase locked loop IC for supplying at least two frequency setting voltages to the variable capacitance diode so as to control the oscillation frequency.
Preferably, the phase locked loop IC supplies at least two frequency setting voltages to the variable capacitance diode in accordance with a predetermined set period cycle, and the RF oscillator sets at least two reference oscillation frequencies according to the set period cycle And the MCU controls the phase locked loop unit so that the RF oscillator controls the phase locked loop unit so as to maintain one reference oscillation frequency using the electrical signal received from the phase locked loop unit, And determines whether or not the object is accessed in the set period cycle unit.
Preferably, the electric signal received by the MCU from the phase locked loop unit is a frequency adjusting voltage outputted from the phase locked loop IC to be supplied to the variable capacitance diode.
Preferably, the MCU receives, from the phase locked loop, a voltage for frequency adjustment output to supply to the variable capacitance diode for each of at least two reference oscillation frequencies that form one set period cycle, And determines that the object approaches the sensor strip when the frequency adjustment voltage for any one reference oscillation frequency exceeds the allowable range of the preset electrical signal reference value.
Preferably, the MCU receives from the phase locked loop a frequency adjustment voltage output for supplying the variable capacitance diode with at least two reference oscillation frequencies that form one set period cycle, And determines that the object has approached the sensor strip when the average value of the frequency adjustment voltage for each reference oscillation frequency in the set period cycle exceeds the allowable range of the predetermined electrical signal average reference value.
Preferably, the phase control means controls the phase of the power supply waveform applied to the sensor strip to have at least two phase shift states.
Preferably, the phase control means is a variable capacitor.
Preferably, the phase control means is a variable inductor.
Preferably, the phase control means is a switching means in which a capacitor and an inductor are connected in parallel.
Preferably, the capacitor is a variable capacitor, and the inductor is a variable inductor.
Preferably, the sensor strip is installed on a target object to be fixed or moved, and the object is an obstacle to approach or approach the target object.
The present invention as described above is characterized in that phase control means is provided between the sensor strip and the RF oscillator to control the phase of the power supply waveform applied to the sensor strip and the frequency of the RF oscillator is controlled by at least two reference oscillation frequencies Thereby providing an effect of preventing a detection error problem due to a dead point of the sensor strip.
Particularly, the present invention has an advantage of solving a dead point problem while using a simple circuit configuration as compared with a conventional method using two or more RF oscillators.
In addition, since the present invention uses a phase control and a frequency control of a power waveform applied to a sensor strip together, it is possible to variably control the position of a dead point.
1 is a schematic block diagram of a conventional object proximity sensing apparatus.
2 is a circuit diagram of an object proximity sensing apparatus according to an embodiment of the present invention.
3 is a circuit block diagram of an object proximity sensing apparatus according to another embodiment of the present invention.
4 is a circuit diagram of an object proximity sensing apparatus according to another embodiment of the present invention.
5 is a schematic diagram of a sensor strip according to an embodiment of the present invention.
6 is a schematic diagram for explaining a sensing state of a sensor strip according to an object proximity sensing apparatus according to an embodiment of the present invention.
The present invention may be embodied in many other forms without departing from its spirit or essential characteristics. Accordingly, the embodiments of the present invention are to be considered in all respects as merely illustrative and not restrictive.
The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms.
The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.
And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.
It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, .
On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.
The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.
In the present application, the terms "comprises", "having", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, components, or combinations of elements, numbers, steps, operations, components, parts, or combinations thereof.
Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that the present invention may be easily understood by those skilled in the art. .
FIG. 5 is a schematic diagram of a sensor strip according to an embodiment of the present invention. FIG. 6 is a schematic diagram of an object proximity sensor according to an embodiment of the present invention. FIG. 3 is a schematic view for explaining a sensing state of a sensor strip according to an apparatus; FIG.
2, the object
For example, the
For example, the
The
In this embodiment, a motor-driven opening / closing module for automatically opening and closing a window or a door of an automobile will be described as an
In this embodiment, when the capacitance of the
The
In this embodiment, phase control means is provided between the
In this embodiment, the
In the
In general, when a sinusoidal AC voltage is applied to the capacitor, the phase of the current flowing through the capacitor due to the phase conversion characteristic of the capacitor has a phase 90 degrees ahead of the phase of the voltage. A
Generally, the frequency oscillated by the
For example, when the capacitance of the
For example, if the variable period for changing and controlling the capacitance of the
For example, the
The phase locked loop unit maintains the oscillation frequency of the
That is, when the oscillation frequency of the
In particular, the phase locked loop unit of this embodiment is configured to control the oscillation frequency by at least two reference oscillation frequencies.
For example, when the reference oscillation frequency is variably controlled according to a predetermined period, the interval of the dead points generated in the
In this embodiment, variable capacitance control of the
The microcontroller unit (MCU) 150 is connected to the phase locked loop unit and determines whether an object is accessed based on a change in the oscillation frequency value of the
That is, when the electrostatic capacitance value changes in the
The frequency adjustment voltage value for controlling the oscillation frequency of the
The
The
The
The phase locked loop unit of this embodiment will be described in more detail.
The phase locked loop section of this embodiment includes a
The
In a state in which the oscillation frequency of the
When the oscillation frequency of the
To apply or change the voltage for frequency adjustment is to change the voltage for frequency adjustment to the frequency setting voltage at the time point originally applied to the
The
The phase locked
The phase locked
Preferably, the phase locked
In addition, the
In this control, an electric signal received by the
The
With such a configuration, for example, the oscillation frequency of the
That is, when the object (obstacle) approaches the
In the present embodiment, the
For example, when it is determined that the object is approaching by the
Alternatively, the sensed voltage value may be transmitted to a separate control module (not shown) provided at a remote place so that the control module determines whether or not the object is accessed and controls the control module accordingly. The control module may be, for example, a central control panel (not shown) provided at a remote place and controlling the plurality of
Hereinafter, a process of controlling the variable frequency by using at least two reference oscillation frequencies in the phase locked loop will be described.
The frequency oscillated by the
Preferably, the frequency oscillated by the
The set period cycle of the reference oscillation frequency described above can be understood as an example as shown in Table 1 below.
order
Frequency (MHz)
According to the reference oscillation frequency control of the set periodic cycle type, the intervals and positions of the dead points that can occur in the
Particularly, the object proximity sensing apparatus of the present embodiment performs the phase variable control with the reference oscillation frequency variable control with respect to the power supply waveform applied to the sensor strip, so that the detection error problem due to the dead point is more effectively prevented.
FIG. 6 illustrates a state where a position of a dead point generated in the
Further, as described above, since the variable control of the capacitance of the
Meanwhile, in the embodiment of FIG. 6, the case where the set period cycle of the reference oscillation frequency changes in the order of 1050 MHz -> 1000 MHz -> 950 MHz -> 1050 MHz is exemplified. Such a set period cycle can be variously changed. For example, it may be controlled to change according to a more complicated pattern such as 1050 MHz -> 1000 MHz -> 950 MHz -> 1000 MHz -> 950 MHz -> 1050 MHz -> 950 MHz -> 1050 MHz -> 1000 MHz, or to change randomly.
Hereinafter, an object proximity sensing operation according to the object proximity sensing apparatus of the present embodiment will be described.
First, a frequency corresponding to a reference oscillation frequency (for example, 950 MHz to 1.05 GHz) oscillated by the
To this end, the phase locked
In addition, the
The reference oscillation frequency and the frequency setting voltage output to maintain the reference oscillation frequency are set in the
In particular, as described above, at least two frequency setting voltages corresponding to the respective reference oscillation frequencies are set in the
The
When the user operates the door closing button or the like in a state where the reference oscillation frequency and the frequency setting voltage are set, the
When the object proximity sensing apparatus is in a standby state, for example, when a door or window of a vehicle is open, the
The
When the object approaches the
At this time, the
If it is determined that the frequency adjustment voltage is out of the allowable range in the
If there is no object in the process of closing the door (operation mode), the frequency setting voltage output from the phase locked
Meanwhile, in the control process, the
For example, when the reference oscillation frequency is set to 1050 MHz, it is assumed that the frequency of the reference oscillation frequency is 1050 MHz -> 1000 MHz -> 950 MHz -> 1050 MHz. If the voltage for frequency adjustment exceeds the allowable range of the preset electrical signal reference value when the allowable range is exceeded or the reference oscillation frequency is 1000 MHz or the frequency adjustment voltage exceeds the allowable range of the preset electrical signal reference value when the reference oscillation frequency is 950 MHz It is possible to determine that the object approaches the
As another example, the
For example, when the reference oscillation frequency is set to 1050 MHz, it is assumed that the frequency of the reference oscillation frequency is 1050 MHz -> 1000 MHz -> 950 MHz -> 1050 MHz. (Or ratio) exceeding the permissible range, and the degree (or ratio) that the frequency adjustment voltage exceeds the allowable range of the preset electrical signal reference value when the reference oscillation frequency is 1000 MHz and the degree (Or the ratio) exceeding the allowable range of the predetermined electrical signal reference value, and when the average value exceeds the allowable range of the predetermined electrical signal average reference value (the allowable range for one cycle) It may be determined that the
3 is a circuit block diagram of an object proximity sensing apparatus according to another embodiment of the present invention.
In this embodiment, the
Generally, when a sinusoidal AC voltage is applied to the inductor, the phase of the current flowing in the inductor due to the phase conversion characteristic of the inductor has a phase delayed by 90 ° with respect to the phase of the voltage. The
For example, when the inductance of the
For example, if the variable period for changing and controlling the inductance of the
4 is a circuit diagram of an object proximity sensing apparatus according to another embodiment of the present invention.
In this embodiment, the switching means 502, in which the
In general, the phase of the current flowing through the capacitor has a phase 90 ° ahead of the phase of the voltage, and the phase of the current flowing through the inductor has a phase delayed by 90 ° with respect to the phase of the voltage.
A
The switching means 502 alternately switches and connects the
With this switching configuration, the position of the dead point occurring in the
Although the present invention has been described with reference to the preferred embodiments thereof with reference to the accompanying drawings, it will be apparent to those skilled in the art that many other obvious modifications can be made therein without departing from the scope of the invention. Accordingly, the scope of the present invention should be interpreted by the appended claims to cover many such variations.
100: Object proximity sensor 110: Sensor strip
120: RF oscillator 141: variable capacitance diode
142: Phase locked loop IC 143: Signal line for frequency adjustment
144: Detecting capacitor 145: Loop filter
150: MCU 151: ADC
162: input unit 163:
164: Communication interface 170: Actuator module
302: variable capacitor 402: variable inductor
502: switching means
Claims (12)
An RF oscillator connected to the sensor strip and varying an oscillation frequency according to a change in capacitance value of the sensor strip;
Phase control means provided between the sensor strip and the RF oscillator for controlling a phase of a power supply waveform applied to the sensor strip;
Wherein the RF oscillator is controlled to maintain a reference oscillation frequency when the oscillation frequency of the RF oscillator is changed from a reference oscillation frequency according to a change in the capacitance value, A phase locking loop unit for controlling the oscillation frequency;
And an MCU connected to the phase locked loop unit and determining whether an object is accessed using an electrical signal received from the phase locked loop unit while the phase locked loop unit controls the RF oscillator to maintain a reference oscillation frequency Wherein the object proximity sensing device comprises:
Wherein the phase lock loop unit comprises:
A variable capacitance diode connected to the RF oscillator,
Wherein the RF oscillator is controlled by the MCU and continuously senses the oscillation frequency of the RF oscillator through the frequency sensing means, and when the oscillation frequency of the RF oscillator is changed from the reference oscillation frequency, Wherein at least two or more frequency setting voltages are applied to the variable capacitance diode so that the oscillation frequency is controlled by at least two reference oscillation frequencies by controlling the oscillation frequency of the RF oscillator to maintain the reference oscillation frequency by supplying a voltage And a phase locked loop IC for supplying the phase locked loop IC.
The phase locked loop IC includes:
At least two frequency setting voltages are supplied to the variable capacitance diode according to a predetermined set period cycle so that the RF oscillator maintains at least two reference oscillation frequencies according to the set period cycle,
The MCU includes:
Wherein the phase locked loop controls the RF oscillator to maintain a reference oscillation frequency set in accordance with the set periodic cycle, The object proximity detection apparatus comprising:
Wherein the electric signal received by the MCU from the phase locked loop unit is a voltage for frequency adjustment outputted from the phase locked loop IC to supply to the variable capacitance diode.
The MCU includes:
From the phase locked loop unit, a voltage for frequency adjustment output for supplying to the variable capacitance diode for each of at least two reference oscillation frequencies that form one set period cycle,
And determines that the object has approached the sensor strip when the frequency adjustment voltage for any one of the reference oscillation frequencies exceeds the allowable range of the preset electrical signal reference value.
The MCU includes:
From the phase locked loop unit, a voltage for frequency adjustment output for supplying to the variable capacitance diode for each of at least two reference oscillation frequencies that form one set period cycle,
It is determined that the object approaches the sensor strip when the average value in the set period cycle of the frequency adjustment voltage for each reference oscillation frequency exceeds the allowable range of the predetermined electrical signal average reference value for each set period cycle The object proximity detection device comprising:
Wherein the phase control means comprises:
Wherein the controller controls the phase of the power supply waveform applied to the sensor strip to have at least two phase shift states.
Wherein the phase control means is a variable capacitor.
Wherein the phase control means is a variable inductor.
Wherein the phase control means is a switching means in which a capacitor and an inductor are connected in parallel.
Wherein the capacitor is a variable capacitor, and the inductor is a variable inductor.
Wherein the sensor strip is installed on a target object to be fixed or moved, and the object is an obstacle approaching or approaching the target object.
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| KR1020150144251A KR101746122B1 (en) | 2015-10-15 | 2015-10-15 | Sensing Apparatus for Approach of Object |
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| KR1020150144251A KR101746122B1 (en) | 2015-10-15 | 2015-10-15 | Sensing Apparatus for Approach of Object |
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| KR20170044483A true KR20170044483A (en) | 2017-04-25 |
| KR101746122B1 KR101746122B1 (en) | 2017-06-13 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190020590A (en) * | 2017-08-21 | 2019-03-04 | 김태윤 | Sensing apparatus for approach of object and collision prevention safety system using the same |
| KR20190033959A (en) * | 2017-09-22 | 2019-04-01 | 김태윤 | Weatherstrip for object approach sensing and sensing apparatus for approach of object using the same |
| KR20190033964A (en) * | 2017-09-22 | 2019-04-01 | 김태윤 | Weatherstrip with the function of object approach sensing and sensing apparatus for approach of object using the same |
| WO2020105770A1 (en) * | 2018-11-23 | 2020-05-28 | 황성공업 주식회사 | Device for sensing approach of object and method for sensing approach of object by using same |
| WO2020159477A1 (en) * | 2019-01-29 | 2020-08-06 | Kain Aron Z | Displacement sensor and switch |
| CN111989864A (en) * | 2018-03-21 | 2020-11-24 | 胡夫·许尔斯贝克和福斯特有限及两合公司 | Assembly for a capacitive sensor mechanism |
| US11022511B2 (en) | 2018-04-18 | 2021-06-01 | Aron Kain | Sensor commonality platform using multi-discipline adaptable sensors for customizable applications |
| KR20230001444A (en) * | 2021-06-28 | 2023-01-04 | 주식회사 앤씨엠 | Car sensing system and managing method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102328642B1 (en) * | 2018-12-31 | 2021-11-22 | 황성공업 주식회사 | Sensing Apparatus for Approach of Object |
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2015
- 2015-10-15 KR KR1020150144251A patent/KR101746122B1/en active IP Right Grant
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190020590A (en) * | 2017-08-21 | 2019-03-04 | 김태윤 | Sensing apparatus for approach of object and collision prevention safety system using the same |
| KR20190033959A (en) * | 2017-09-22 | 2019-04-01 | 김태윤 | Weatherstrip for object approach sensing and sensing apparatus for approach of object using the same |
| KR20190033964A (en) * | 2017-09-22 | 2019-04-01 | 김태윤 | Weatherstrip with the function of object approach sensing and sensing apparatus for approach of object using the same |
| CN111989864A (en) * | 2018-03-21 | 2020-11-24 | 胡夫·许尔斯贝克和福斯特有限及两合公司 | Assembly for a capacitive sensor mechanism |
| US11022511B2 (en) | 2018-04-18 | 2021-06-01 | Aron Kain | Sensor commonality platform using multi-discipline adaptable sensors for customizable applications |
| WO2020105770A1 (en) * | 2018-11-23 | 2020-05-28 | 황성공업 주식회사 | Device for sensing approach of object and method for sensing approach of object by using same |
| WO2020159477A1 (en) * | 2019-01-29 | 2020-08-06 | Kain Aron Z | Displacement sensor and switch |
| US11728809B2 (en) | 2019-01-29 | 2023-08-15 | Aron Z. Kain | Displacement sensor and switch |
| KR20230001444A (en) * | 2021-06-28 | 2023-01-04 | 주식회사 앤씨엠 | Car sensing system and managing method thereof |
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|---|---|
| KR101746122B1 (en) | 2017-06-13 |
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