KR20170099333A - Digital measure apparatus using magnetic sensor - Google Patents

Abstract

A digital measurement device using a magnetic sensor according to an embodiment of the present invention comprises: a body unit which includes a leaf spring for adjusting the winding length of a measurement member by elastic force, and is provided with a magnetic element on the upper surface thereof; a housing which surrounds the body unit; a sensor unit which is formed on the lower surface of the upper portion of the housing, and detects changes in the magnetic field; and a calculation unit which a withdrawal length of the measurement member on the basis of the detection result of the magnetic sensor member.

Description

[0001] DIGITAL MEASURE APPARATUS USING MAGNETIC SENSOR [0002]

Embodiments of the present invention relate to a digital measurement apparatus using a magnetic sensor.

In general, a meter is a tool that captures and directs or records quantitative (quantitative) quantities or physical quantities such as weight, capacity, speed, vibration, noise, temperature, calories and length.

There are many types of these instruments depending on their applications such as electric instruments, aviation instruments, and industrial instruments.

Electricity meter is a device that measures electrical quantities such as voltage, current, power, frequency, etc., electric quantity, temperature, roughness, speed, etc. by electric method. The value of measuring quantity varies instantaneously with instructions, display tube, light It is an indicating instrument to indicate. The aeronautical instrument includes a diaphragm instrument, a gyro instrument, a magnetic instrument, and the industrial instrument corresponds to a device for measuring physical change such as temperature, pressure, and dimension in a process industry and the like.

However, since most instruments must operate keys, buttons, and knobs directly in order to perform measurement, the concentration of work may be reduced. In addition, it may be difficult for a user to measure a physical or chemical change of a measurement object using a general measuring instrument.

Therefore, there is a need to develop a technique that enables a measurer to more easily perform measurement tasks.

A related prior art is the Korean Utility Model Registration No. 20-2001-0019733 (filed on June 29, 2001).

An embodiment of the present invention provides a digital measuring device using a magnetic sensor that can measure a length value of a measuring member by recognizing a magnetic field generated by a magnetic body formed on a fixing plate coupled with a measuring member using a magnetic sensor .

The problems to be solved by the present invention are not limited to the above-mentioned problem (s), and another problem (s) not mentioned can be clearly understood by those skilled in the art from the following description.

A digital measuring device using a magnetic sensor according to an embodiment of the present invention includes a main body having a magnetic body formed on a top surface thereof and a plate spring for adjusting a winding length of the measuring member by an elastic force, a housing for wrapping the main body, A magnetic sensor part formed on a lower surface of the upper part for sensing a change in a magnetic field and an operation part for calculating a length of the measurement member taken out based on the detection result by the magnetic sensor part.

The magnetic sensor unit may sense a change in the magnetic field generated by the rotational movement of the magnetic body.

Wherein the body portion includes a first fixing plate, a second fixing plate rotatably disposed at a position opposite to the fixing plate, the magnetic member being fixedly formed on an upper surface thereof, and a second fixing plate disposed between the first fixing plate and the second fixing plate, And a plate spring for adjusting the winding length of the member.

The magnetic sensor unit may include a plurality of Hall sensors.

The hall sensor may be disposed along the outer circumferential direction of the housing.

The magnetic bodies may be formed in a plurality of locations, and a rotation path formed by the magnetic body in accordance with the rotation of the second fixing plate may be formed at a position facing the hall sensor.

The magnetic bodies may be formed at equal intervals, and the Hall sensors may be disposed between the magnetic bodies to improve the resolution.

The average spacing between the Hall sensors may be greater than the average spacing between the magnetic materials.

The hall sensor can sequentially recognize the magnetic bodies as the second fixing plate rotates by the operation of pulling the measuring member from the housing.

The calculating unit may detect the rotational direction of the second fixing plate based on a change in the magnetic field sensed by the plurality of Hall sensors.

The calculating unit may determine whether the measuring member is pulled in or pulled out based on the rotating direction of the second fixing plate.

The calculating unit measures the net rotation speed of the second fixing plate based on the rotation direction of the second fixing plate and calculates the length of the measuring member taken out in consideration of the thickness of the measuring member and the net rotation speed of the second fixing plate .

The digital measurement apparatus using the magnetic sensor according to an embodiment of the present invention may further include a display unit for displaying the calculated length or a transmission unit for transmitting the calculated length to an external device.

The details of other embodiments are included in the detailed description and the accompanying drawings.

According to an embodiment of the present invention, the length of the measurement member can be measured by recognizing the magnetic field generated by the magnetic body formed on the fixed plate coupled with the measurement member using the magnetic sensor.

According to an embodiment of the present invention, the Hall sensor and the magnetic body can be arranged in an appropriate number, thereby increasing the resolution and the resolution.

According to an embodiment of the present invention, the length of the measurement member taken out can be finely calculated in consideration of the thickness of the measurement member and the number of rotations of the net.

FIG. 1 is a diagram illustrating an internal structure of a digital measurement apparatus using a magnetic sensor according to an embodiment of the present invention. Referring to FIG.
2 is an exploded perspective view of a digital measuring instrument using a magnetic sensor according to an embodiment of the present invention.
3 is a view for explaining the principle of a digital measuring instrument using a magnetic sensor according to an embodiment of the present invention.
4 is a view for explaining the principle of a digital measuring instrument using a magnetic sensor according to another embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and / or features of the present invention, and how to accomplish them, will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view showing an internal structure of a digital measuring instrument using a magnetic sensor according to an embodiment of the present invention. FIG. 2 is a view showing an internal structure of a digital measuring instrument using a magnetic sensor according to an embodiment of the present invention. It is a perspective view.

1 and 2, a digital measuring instrument 100 using a magnetic sensor according to an exemplary embodiment of the present invention includes a main body 110, a housing 120, a magnetic sensor 130, can do.

The directions of the upper and lower portions described below will be described with reference to Figs. 1 and 2. Fig.

The main body 110 includes a leaf spring 113 for adjusting the winding length of the measuring member 150 by an elastic force and a magnetic body 140 formed on the upper surface thereof. 115 may be formed in a state in which the measuring member 150 is wound. At this time, the measuring member 150 may be a tape measure.

Specifically, the main body 110 includes a first fixing plate 111, a second fixing plate 112 (not shown) rotatably disposed at a position opposite to the first fixing plate 111 and having the magnetic body 140 fixed on the upper surface thereof, And a leaf spring 113 disposed between the first fixing plate 111 and the second fixing plate 112 and adjusting the winding length of the measuring member 150 by an elastic force.

The main body 110 may further include a fixing part 115 for fixing the leaf spring 113 and the measuring member 150.

The plate spring 113 can be wound around the fixing portion 115 in the circumferential direction of the inner periphery and the measuring member 150 can be wound in the circumferential direction of the outer periphery.

A plurality of grooves (not shown) may be formed on the upper and lower sides of the circumference of the circumference of the fixing part 115. The plate spring 113 and the measuring member 150 are inserted into the fixing part 115, 113 and the measuring member 150 can be firmly fixed.

The leaf spring 113 may be fixed to the first fixing plate 111 at one end thereof in a cylindrical shape and may be further tightly wound around the frame 114 having a groove formed therein.

For reference, the leaf spring 113 can be fixed more tightly by winding the leaf spring 113 between the frame 114 formed at the upper part of the first fixing plate 111 and having the shape of a circular cylinder.

The first fixing plate 111 and the second fixing plate 112 may be fixed to one fixing plate and the other fixing plate may be rotatably mounted on the fixed plate. In the present invention, The first fixing plate 111 located on the lower side is fixed and the second fixing plate 112 located on the upper side is rotatable.

The measuring member 150 may be wound around the outer circumference of the fixing part 115. When the measuring member 150 is pulled outward, that is, when the measuring member 150 is moved outside the housing 120 The fixing part 115 can be rotated and the second fixing plate 112 coupled to the fixing part 115 can rotate together.

At this time, as the fixing part 115 rotates, the leaf spring 113 wound inside the fixing part 115 can be further wound and compressed in the center direction.

When the measuring member 150 is placed, the plate spring 113 wound in the fixing part 115 can be released and expanded in the outward direction, so that the fixing part 115 can rotate in the opposite direction have.

At this time, as the fixing part 115 rotates, the measuring member 150 is also pulled into the housing 120 while being wound together, and the fixing part 115 is moved by the elastic force of the plate spring 113 The second fixing plate 112 coupled with the fixing portion 115 can also rotate in the opposite direction.

The housing 120 is provided to enclose the main body 110 and specifically includes a lower housing 122 for covering the first fixing plate 111 and a lower housing 122 coupled to the lower housing 122, And an upper housing 121 on which the unit 130 is formed.

The magnetic sensor unit 130 is formed on a lower surface of the housing 120 and senses a change in magnetic field. The magnetic sensor unit 130 senses a change in a magnetic field generated by the rotation of the magnetic body 140.

For this purpose, the magnetic sensor unit 130 preferably includes a plurality of hall sensors 131, but is not limited thereto and may include all sensors for sensing a magnetic field.

In this case, the Hall sensor is a sensor that detects the direction and size of a magnetic field by using a Hall effect in which a voltage is generated in a direction perpendicular to a current and a magnetic field when a magnetic field is applied to a conductor through which current flows.

FIG. 3 is a view for explaining the principle of a digital measuring device using a magnetic sensor according to an embodiment of the present invention, FIG. 4 is a view for explaining the principle of a digital measuring device using a magnetic sensor according to another embodiment of the present invention FIG.

3 and 4, the hall sensor 131 may be disposed along the outer circumferential direction of the upper portion of the housing 120, for example, along the outer circumferential direction of the upper housing 121, The magnetic bodies 140 may be arranged at predetermined intervals along a circle with respect to the central axis.

The plurality of hall sensors 131 can sense the magnetic field generated from the magnetic body 140 based on the rotation of the central axis corresponding to the attracting force of the measuring member 150.

The rotation path formed by the magnetic body 140 according to the rotation of the second fixing plate 112 may be formed at a position opposite to the Hall sensor 131, The Hall sensor 131 senses the magnetic body 140 when the Hall element 131 is vertically overlapped.

At this time, the magnetic bodies 140 are formed at equal intervals, and the Hall sensors 131 are disposed between the magnetic bodies 140 to improve the resolution and resolution of the digital measuring instrument 100.

For this purpose, the average spacing between the Hall sensors 131 is preferably greater than the average spacing between the magnetic bodies 140.

For example, the spacing between the magnetic bodies 140 is set to 45 degrees, and the Hall sensors 131 are arranged at a distance of 45 + x to divide the spacing between the magnetic bodies 140 with a phase difference, It is possible to greatly improve the resolution and the resolution of the measuring instrument 100.

Specifically, the hall sensor 131 is rotated by the operation of the measurement member 150 being pulled out from the housing 120 to rotate the second fixing plate 112, The magnetic body 140 can be sequentially recognized.

The reason why two hall sensors 131 are arranged in succession in the figure is also for checking the directionality. That is, it is a position allocation for detecting that the measuring member 150 is pulled in or pulled out. However, it is needless to say that the Hall sensors 131 are not necessarily two, but may be spaced apart from each other and may be attached in a number exceeding two.

On the other hand, as the number of the magnetic bodies 140 increases, the resolution at which the length of the measurement member 150 can be calculated can be increased.

For example, assuming that there are eight magnetic bodies and three Hall sensors, the resolving power due to the magnet is 45 degrees, which is 360/8, the resolving power due to the hall sensor is 15 degrees, which is 45/3, You can.

The calculation unit may calculate a length of the measurement member 150 taken out based on the detection result of the magnetic sensor unit 130. The calculation unit may be a micro controller unit (MCU), a central processing unit (CPU) Or the like.

The calculating unit may detect the rotational direction of the second fixing plate based on a change in the magnetic field sensed by the plurality of Hall sensors. The measuring unit 150 may detect the rotational direction of the second fixing plate, It is possible to judge the incoming or outgoing.

When the measuring member 150 is pulled out from the outside when the measuring member 150 is wound in a circular shape along the outer peripheral surface of the fixing part 115, 2 radius of the outermost circle is reduced by the thickness of the measuring member 150 according to the number of rotations of the fixing plate.

This is a reduction value that occurs physically regardless of the 360 degree division, and the calculation unit can accurately calculate the length through which the measurement member 150 is taken in consideration of the decrease value through firmware or software in the MCU .

In another embodiment of the present invention, the calculating section may calculate the length of the measuring member drawn out based on at least one of the number of magnetic bodies, the number of hall sensors, the length and thickness of the measuring member.

The method of calculating the length of the measurement member taken out will be described in detail with reference to the following embodiments.

For example, assuming that the measurement member is 3 meters long, if the radius of the outermost circle formed by the measurement member is R1 when all of the measurement members are wound in the form of a circle inside the digital measuring instrument, When the measuring member is pulled and the center shaft or the second fixing plate is rotated by one wheel, the length M1 from which the measuring member is drawn can be calculated by the following equation (1).

[Equation 1]

Here, M1 is the length of the measuring member taken out, and R1 is the radius of the outermost circle formed by the measuring member when the measuring member is all wound in the form of a circle.

On the other hand, the radius of the circle is reduced by the thickness of the measuring member every time the center axis or the second fixing plate rotates one time, and the radius Rn of the outermost circle formed by the measuring member according to the number of rotations is expressed by the following mathematical expression Can be calculated by Equation (2).

&Quot; (2) "

 Rn = R1 - nxd

Herein, Rn is the radius of the outermost circle formed by the measuring member wound when the center shaft or the second fixing plate is rotated n times, n is the net rotation speed of the center shaft or the second fixing plate, d is the thickness to be.

At this time, the net rotation speed represents the difference between the number of rotations in the direction in which the measuring member is drawn out and the number of rotations in accordance with the direction in which the measuring member is drawn.

Therefore, when the central axis or the second fixing plate is rotated n times, the length M from which the measuring member is drawn out can be calculated by the following equation (3) by summing the distances pulled by the measuring members corresponding to the wrist rotation speed have.

Here, M is the length of the measuring member taken out, n is the center axis or the net rotation number of the second fixing plate, Ri is the center axis or the outermost circle formed by the measuring member wound when the second fixing plate is rotated i times, Of the radius.

For example, if the user pulls the measuring member and assumes that the central axis or the second fixing plate has been rotated twice exactly, M can be calculated as 2? R1 + 2? (R1-d).

At this time, the calculation unit can calculate the net rotation number by using the number of times of detection of the magnetic field for each hall sensor, the plurality of magnetic bodies, the hall sensor, and the like.

The digital measurement apparatus using the magnetic sensor according to an embodiment of the present invention may further include a transmission unit for transmitting the calculated length to an external device such as a portable terminal or a display unit for displaying the transmission unit itself.

The transmitting unit can transmit the calculation result to the external device by using communication means such as Bluetooth, wireless LAN, 3G, LTE and ZigBee.

The display unit may correspond to various liquid crystal devices, and may display a length of the measurement member calculated by the calculation unit so that the user can know the accurate length of the measurement member.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, Modification is possible. Accordingly, the spirit of the present invention should be understood only in accordance with the following claims, and all equivalents or equivalent variations thereof are included in the scope of the present invention.

100: Digital measuring instrument
110:
111: first fixing plate
112: second fixing plate
113: leaf spring
114: Frame
115:
120: Housing
121: upper housing
122: Lower housing
130: magnetic sensor unit
131: Hall sensor
140: magnetic substance
150: Measurement member

Claims (14)

A main body including a leaf spring for adjusting a winding length of the measuring member by an elastic force and having a magnetic body formed on an upper surface thereof;
A housing for enclosing the body portion;
A magnetic sensor part formed on a lower surface of the housing and sensing a change in a magnetic field;
A calculation unit for calculating a length of the measurement member taken out based on a result of detection by the magnetic sensor unit,
And a magnetic sensor for measuring the magnetic field.
The method according to claim 1,
Wherein the magnetic sensor part senses a change in a magnetic field generated in accordance with rotational movement of the magnetic body.
The method according to claim 1,
The main body
A first fixing plate;
A second fixed plate rotatably disposed at a position opposite to the fixed plate and having the magnetic body fixedly formed on an upper surface thereof; And
A plate spring disposed between the first fixing plate and the second fixing plate and adjusting the winding length of the measuring member by an elastic force,
And a magnetic sensor for measuring the magnetic field.
The method of claim 3,
Wherein the magnetic sensor unit includes a plurality of Hall sensors.
5. The method of claim 4,
Wherein the Hall sensor is disposed along an outer circumferential direction of the upper portion of the housing.
6. The method of claim 5,
The plurality of magnetic bodies are formed,
And a rotation path formed by the magnetic body in accordance with rotation of the second fixing plate is formed at a position opposite to the Hall sensor.
The method according to claim 6,
The magnetic bodies are formed at regular intervals,
Wherein the Hall sensor is disposed between the magnetic bodies to improve the resolution.
8. The method of claim 7,
Wherein the average spacing between the Hall sensors is greater than the average spacing between the magnetic materials.
The method according to claim 6,
The Hall sensor
And the magnetic body is sequentially recognized as the second fixing plate rotates by the operation of pulling out the measuring member from the housing.
6. The method of claim 5,
Wherein the calculating unit detects the rotational direction of the second fixing plate based on a change in the magnetic field sensed by the plurality of Hall sensors.
11. The method of claim 10,
Wherein the calculation unit determines whether the measurement member is pulled in or pulled out based on the rotation direction of the second fixing plate.
11. The method of claim 10,
The calculating unit measures the net rotation speed of the second fixing plate based on the rotating direction of the second fixing plate,
Wherein the length of the measuring member is calculated in consideration of the thickness of the measuring member and the net rotation speed of the second fixing plate.
The method according to claim 1,
And a display unit for displaying the calculated length.
The method according to claim 1,
And a transmitter for transmitting the calculated length to an external device.

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