WO2020096278A1

WO2020096278A1 - Distance measuring device having plurality of measurement modes

Info

Publication number: WO2020096278A1
Application number: PCT/KR2019/014653
Authority: WO
Inventors: 최준영
Original assignee: 최준영
Priority date: 2018-11-05
Filing date: 2019-11-01
Publication date: 2020-05-14
Also published as: KR101968513B1; CN113286980A

Abstract

The present invention relates to a distance measuring device having a plurality of measurement modes, wherein the distance measuring device is capable of easily measuring a distance to one measurement point or a distance between two measurement points by automatically switching a measurement mode to one of a first mode for measuring a distance to one certain measurement point, a second mode for measuring a distance between two measurement points remotely from the two measurement points, and a third mode for measuring a distance between two measurement points on a path which straightly connects the two measurement points, according to postures of first and second pivoting bodies, rear end portions of which are pivotably coupled to each other.

Description

Distance meter with multiple measuring modes

The present invention relates to a range finder, and a range finder having a plurality of measurement modes for measuring a distance to one measurement point or a distance between two measurement points.

As a conventional method for measuring the distance between two measurement points, a method using a tape-type measuring device is widely used.

In order to use the tape-type measuring instrument, the tape-type measuring instrument must be straightened by moving to one measuring point, fixing the end of the tape-type measuring instrument, and moving to another measuring point.

Therefore, when there is an obstacle between the two measurement points, it is impossible to measure a straight line distance between the two measurement points using a conventional tape-type measuring device. In addition, if the distance between the two measurement points is far, it is not easy to measure the distance using a tape-type measuring device and the measurement value is incorrect.

In order to solve this inconvenience, Korean Patent Registration No. 0-0631302 "Portable Meter" has been proposed.

The portable measuring device is a non-contact distance measuring device that measures a distance between two measuring points using a laser and measures the angle between the two measuring points to calculate and calculate the distance between the two measuring points by trigonometry.

Such a conventional distance meter has the advantage of being able to easily measure the distance between two measurement points, but there is a limitation that the range of use is limited in that it always measures the distance between two measurement points. There is a problem in that it is inconvenient to use to measure the distance by using, and there is a problem in that in some cases, such a calculation method is a factor in expanding the error in that the distance between two measurement points is always calculated using an angle.

The present invention has been devised to solve the problems of the prior art as described above, a distance having a plurality of measurement modes that can easily measure the distance to one measurement point or the distance between two measurement points according to the attitude of the range finder I would like to present a meter.

More specifically, it operates automatically in one of three measurement modes according to the rotation angle to measure the distance to one measurement point, to measure the distance between two measurement points that are separated from the user, or to reference the user's position We want to be able to measure the distance to two measuring points located in opposite directions.

In order to solve the above problems, the present invention is provided on the rear end of the first direction indicating body and the first direction indicating body formed in a bar (bar) form to indicate the direction, but the first rotation limiting jaw is formed. A first rotating body comprising a first rotating coupling body; A second direction indicating body formed in a bar shape to indicate a direction and a rear end of the second direction indicating body are rotatably coupled to the first rotational coupling body and the first rotation limiting jaw It comprises a second rotational coupling body is formed in contact with the second rotational limiting jaw to limit the rotation, and the second rotational coupling body relative to the first rotational coupling body, The first posture and the body for the first direction indicating that the first direction body and the body for the second direction indication are in contact with each other while the angle between the body for the first direction indication and the body for the second direction is 0 °. The second posture in which the angle formed by the body for the second direction indication is greater than 0 ° and less than 180 °, and the angle between the body for the first direction indication and the body for the second direction indication is 180 °, and the first rotation limiting jaw Limited to the second round Second rotating body which are in contact with each other to select a third position one of the orientation of; A first laser distance measuring module provided in the body for the first direction indication and measuring a first distance value that is a distance value to any one measurement point in a direction indicated by the first direction indication body; A second laser distance measuring module provided on the body for the second direction indicating and measuring a second distance value that is a distance to another measurement point in a direction indicated by the body for the second direction indicating; A rotation angle measurement module for measuring a rotation angle of the second rotation coupling body with respect to the first rotation coupling body; The posture determination unit determines the posture of the first direction indicating body and the second direction indicating body according to the rotation angle measured by the rotation angle measurement module, which is one of the first, second and third postures, and the posture. If the attitude determined by the determination unit is the first attitude, the first distance calculation module and the attitude determination for calculating a value corresponding to the distance value to the one measurement point as the display distance value using only the first distance value A second distance calculation module for calculating a distance value between the two measurement points as the display distance value using the first distance value, the second distance value, and the rotation angle when the posture determined by the unit is the second posture; If the posture determined by the posture determination unit is in a third posture, the third distance is calculated by calculating the distance value between the two measurement points as the display distance value using only the first distance value and the second distance value. The display distance value calculator configured to execute any one of the modules according to the determination of the attitude determination unit, and if the attitude determined by the attitude determination unit is the first posture, cut off the power supply to the second laser distance measurement module A control unit comprising a second laser power cut-off module; A display unit for visually displaying the display distance value calculated by the display distance value calculator; A power supply unit for supplying power to the first laser distance measurement module, the second laser distance measurement module, the rotation angle measurement module, the control unit, and the display unit; It characterized in that it comprises a.

In the above, the 1-1 magnetic force coupling member provided in a portion facing the body for the second direction indication of the body for the first direction indication, toward the body for the first direction indication of the body for the second direction indication A 1-2 magnetic coupling member provided in a portion and a 1-2 magnetic coupling member capable of magnetically coupling with the 1-1 magnetic coupling member, and a 2-1 magnetic coupling member provided in a portion facing the second rotation restriction jaw of the first rotation restriction jaw, It is preferable that the second rotational limiting jaw is provided at a portion facing the first rotational limiting jaw and further comprises a 2-2 magnetic coupling member capable of magnetically coupling with the 2-1 magnetic coupling member.

If a distance meter having a plurality of measurement modes according to the present invention is used as described above, it is automatically converted to any one of three measurement modes according to the rotation angle to measure a distance to one measurement point, or a triangle It is possible to measure the distance between two measurement points that are separated from the user, or to the two measurement points located in opposite directions to each other based on the user's location.

In particular, when measuring the distance to one measurement point or the distance to two measurement points located opposite to each other based on the user's position, the attitude of the range finder is fixed stably to reduce errors and stably measure In addition, it is possible to measure the distance by using the range finder with only one hand.

In addition, when measuring the distance to two measurement points located in opposite directions to each other based on the user's location, the distance is calculated by simple summation of distance values, not by distance measurement by trigonometry, so errors can be minimized. .

1 is a perspective view of a distance meter having a plurality of measurement modes according to an embodiment of the present invention in a first posture;

FIG. 2 is a perspective view when a range finder having a plurality of measurement modes in FIG. 1 is in a second position;

3 is a perspective view of a distance meter having a plurality of measurement modes in FIG. 1 in a third posture,

4 is a block diagram for controlling a range finder having a plurality of measurement modes of FIG. 1,

FIG. 5 is a view showing a state in which a range finder having a plurality of measurement modes of FIG. 1 is used;

FIG. 6 is a view showing a state in which a range finder having a plurality of measurement modes in FIG. 2 is used,

FIG. 7 is a view showing a state in which a range finder having a plurality of measurement modes in FIG. 3 is used.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains may easily practice. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. In addition, in order to clearly describe the present invention in the drawings, parts irrelevant to the description are omitted, and like reference numerals are assigned to similar parts throughout the specification. When a certain part of the specification "includes" a certain component, this means that other components may be further included instead of excluding other components unless specifically stated otherwise.

1 is a perspective view of a distance meter having a plurality of measurement modes according to an embodiment of the present invention when in a first position, and FIG. 2 is a distance meter having a plurality of measurement modes of FIG. 1 when in a second position 3 is a perspective view when a range finder having a plurality of measurement modes in FIG. 1 is in a third position, and FIG. 4 is a block diagram for controlling a range finder having a plurality of measurement modes in FIG. 5 is a view showing a state of using a range finder having a plurality of measurement modes of FIG. 1, FIG. 6 is a view showing a state of using a range finder of a plurality of measurement modes of FIG. 3 is a view showing a state in which a range finder having a plurality of measurement modes is used.

A distance meter having a plurality of measurement modes according to an embodiment of the present invention (hereinafter referred to as a “distance meter”, 10) includes a first rotating body 100, a second rotating body 200, a rotation angle measurement module, and a display It comprises a unit 123, the control unit 400.

The distance meter 10 of the present embodiment is the first rotation body 100 and the second rotation body 200 are rotatably coupled in the form of a compass, and the distance meter 10 is folded in half or in a straight line. When unfolding and changing its posture, the measurement mode is automatically changed.

The first rotating body 100 is composed of a first direction indicating body 110 and a first rotating coupling body 120.

The first direction indicating body 110 is formed in a bar shape to indicate a direction, and the first rotational coupling body 120 attaches the first rotational body 100 to the second rotational body 200. In order to be rotatably coupled, a cylindrical shape is provided at one end of the first direction indicating body 110.

The first direction indicating body 110 is in the form of a straightly extended bar so as to intuitively know the direction indicated.

First laser distance measurement for measuring a first distance value, which is a distance value to any one measurement point in a direction indicated by the first direction indication body 110, at the front end of the first direction indication body 110 The module 111 is provided.

The first laser distance measuring module 111 is a device for measuring a distance to a measurement point using a laser, which is a known technique, and thus detailed description is omitted.

A 1-1 magnetic coupling member 112 is provided at a portion of the first direction indicating body 110 facing the second direction indicating body 210. The 1-1 magnetic coupling member 112 is magnetically coupled to the 1-2 magnetic coupling member 212, which will be described later, of the body 110 for the first orientation indication, relative to the second direction indication body 210, which will be described later. It is to fix the posture.

At the rear end of the first direction indicating body 110, a first rotationally engaging body 120 in the form of a cylinder is provided. On the outer circumferential surface of the first rotational coupling body 120, a first rotational limiting jaw 121 for restricting rotation of the second rotational body 200 relative to the first rotational body 100 is formed to protrude outward.

The first rotation limiting jaw 121 limits the rotation of the second rotational body 200 with respect to the first rotational body 100 while contacting the second rotational limiting jaw 221 described later.

In addition, a 2-1 magnetic coupling member 122 is provided on the first rotation limiting jaw 121. The 2-1 magnetic coupling member 122 is magnetically coupled with the 2-2 magnetic coupling member 222, which will be described later, to adjust the posture of the body 110 for the first orientation indication relative to the body 210 for the second orientation indication. It is to fix.

The second rotating body 200, like the first rotating body 100, consists of a body 210 for a second direction indication and a body 220 for a second rotational coupling.

In addition, a second laser distance measuring module 111 and a 1-2 magnetic coupling member 212 are provided on the body 210 for the second direction indication, and the second rotation limiting jaw is provided on the body 220 for the second rotation coupling. 221 and the 2-2 magnetic coupling member 222 is provided. These are the same as the description of the corresponding elements of the first rotating body 100, unless otherwise specified.

The second laser distance measurement module 211 is for measuring a second distance value that is a distance value to another measurement point in a direction indicated by the second direction indicating body 210.

When the 1-1 magnetic coupling member 112 and the 1-2 magnetic coupling member 212 are coupled by magnetic force, the first direction indicating body 110 and the second direction indicating body 210 are in the same direction. The posture is fixed in the state toward.

The second rotation coupling body 220 is rotatably coupled to the first rotation coupling body 120.

The rotational angle of the body 210 for the second direction indication relative to the body 110 for the first direction indication is limited to 180 degrees on the outer circumferential surface of the second rotation coupling body 220 in contact with the first rotation limiting jaw 121 The second rotation limiting jaw 221 is formed to protrude outward.

The first rotation limiting jaw 121 of the first rotational coupling body 120 and the second rotational limiting jaw 221 of the second rotational coupling body 220 are relative to the body 110 for the first direction indication. When the rotational angle of the second direction indicating body 210 is less than 180 degrees, they are spaced apart from each other, and when the rotational angle is 180 degrees, they are in contact with each other and the second rotational body relative to the first rotational body 100 ( 200) is no longer rotated.

The second rotation limiting jaw 221 is provided with a 2-2 magnetic coupling member 222 capable of magnetic coupling to the 2-1 magnetic coupling member 122. When the first rotation limiting jaw 121 and the second rotation limiting jaw 221 come into contact, the 2-1 magnetic coupling member 122 and the 2-2 magnetic coupling member 222 are magnetically coupled to the first. The postures of the rotating body 100 and the second rotating body 200 are fixed in an unfolded state.

The first-first magnetic coupling member 112 of the first direction indicating body 110 and the first-second magnetic coupling member 212 of the second direction indicating body 210 are made of a pair of magnets or one. It consists of a magnet and a removable metal piece.

Similarly, the 2-1 magnetic coupling member 122 of the first rotation restriction jaw 121 and the 2-2 magnetic coupling member 222 of the second rotation restriction jaw 221 are made of a pair of magnets or one It consists of a magnet and a removable metal piece.

As described above, the angle formed by the body 110 for the first direction indication and the body 210 for the second direction indication by rotation of the second rotation coupling body 220 relative to the first rotation coupling body 120 is 0. It is either the first posture (°) (see FIG. 1), the second posture greater than 0 ° and less than 180 ° (see FIG. 2), or the third posture (see FIG. 3), which is 180 °.

In addition, when the first posture (that is, 0 °), the first direction indicating body 110 and the second direction indicating body 210 come into contact with each other and the rotation range is limited, and also the first direction indicating body 110 ) Of the 1-1 magnetic coupling member 112 and the 1-2 magnetic coupling member 212 of the second direction indicating body 210 are magnetically coupled to each other, and the posture is fixed.

In addition, when the third posture (that is, 180 °), the rotation range is limited as the first rotation restriction jaw 121 and the second rotation restriction jaw 221 come into contact with each other, and also the first rotation restriction jaw 121 is removed. As the 2-1 magnetic coupling member 122 and the 2-2 magnetic coupling member 222 of the second rotation limiting jaw 221 are magnetically coupled to each other, their postures are fixed.

A rotation angle measurement module for measuring a rotation angle of the second rotation body 200 with respect to the first rotation body 100 inside the first rotation coupling body 120 and the second rotation coupling body 220. 300, see FIG. 4).

The distance value measured by the distance measuring device 10 is displayed on the display unit 123 as a display distance value after appropriate calculation. The display unit 123 is provided on the upper portion of the first rotational coupling body 120 so that the user can easily check it.

However, the arrangement form of the display unit 123 may be variously modified according to embodiments.

The distance measurer 10 automatically determines which posture is formed between the first direction indicating body 110 and the second direction indicating body 210, that is, one of the first, second and third postures, and measures three. It automatically operates in any one of the measurement modes.

To this end, the control unit 400 of the distance measurer 10 includes a posture determination unit 410, a display distance value calculation unit 420, and a second laser power-off module 430.

The posture determination unit 410 has a posture of the first direction indicating body 110 and the second direction indicating body 210 according to the rotation angle measured by the rotation angle measurement module 300. Determine which posture you are in.

According to the attitude determined by the attitude determination unit 410, the display distance value calculation unit 420 calculates a display distance value that is a distance value to be visually displayed by the display unit 123.

The display distance value calculation unit 420 includes a first distance calculation module 421 for a first posture (0 °) and a second distance calculation module 422 for a second posture (over 0 ° and less than 180 °). , Including a third distance calculating module 423 for a third posture (180 °), so that any one module is executed according to the posture determined by the posture determining unit 410.

The first distance calculation module 421 uses only the first distance value measured by the first laser distance measurement module 111 to the measurement point when the posture determined by the posture determination unit 410 is the first posture. The value corresponding to the distance value of is calculated as the distance value for display.

At this time, the display distance value may be the same value as the first distance value, or may be a modified first distance value in which a correction value according to the arrangement position of the first laser distance measurement module 111 is adjusted.

Referring to FIG. 5, in the case of the first posture, the present distance meter operates in a first mode in which the first distance calculation module 421 is executed, which is the distance La to one measurement point (a) It is a measurement mode for measuring.

In the first mode, the first and second

direction indicating bodies

110 and 210 are brought into contact with each other to face the same direction. At this time, the first rotating body 100 and the first and second magnetic coupling members 112 and 1-2 magnetic coupling members 212 provided on the side surfaces of the first and second

direction indicating bodies

110 and 210 The posture of the two-movement body 200 is fixed.

Therefore, if there is no separate external force, the distance meter 10 stably maintains the first posture, and it is possible to operate the distance meter 10 with one hand. Therefore, it is possible for the user to use the other hand for different purposes, which makes measurement work very convenient.

On the other hand, the control unit 400 is provided with a second laser power cut-off module 430, and the second laser power cut-off module 430 is a second laser distance measuring module when the attitude determined by the posture determining unit 410 is the first posture. The power supply to (211) is cut off. That is, in the first posture, the operation of the second laser distance measuring module 211 is stopped. This is to operate only one laser distance measurement module, that is, the first laser distance measurement module 111, because the laser light emitted from the laser distance measurement module may cause confusion of the user.

When the distance meter 10 is operated in the first mode, only the first laser distance measuring module 111 is operated to measure only the first distance value La. Since the measured first distance value (La) is a distance value to the measurement point (a) to be measured, the correction value according to the arrangement position of the first laser distance measurement module 111 is calculated to calculate the distance value for the display. Is done.

The second distance calculation module 422 displays the distance value between the two measurement points using the first distance value, the second distance value, and the rotation angle when the posture determined by the posture determination unit 410 is the second posture. Calculate as distance value.

At this time, the display distance value is a value obtained by calculating the first distance value, the second distance value, and the rotation angle according to a triangular method.

Referring to FIG. 6, in the case of the second posture, the present distance meter operates in a second mode in which the second distance calculation module 422 is executed, which is a straight line distance value between two measurement points (a, b). This is a measurement mode for measuring (L).

In the second mode, the first distance value (La) measured by the first laser distance measuring module 111 and the second distance value (Lb) measured by the second laser distance measuring module 211, and rotation The distance between two measurement points is calculated by using the rotation angle θ of the second rotating body 200 with respect to the first rotating body 100 measured in each measuring module 300.

More specifically, the first distance value (La) is the value obtained by adding the length (L1) from one end of the first direction indicating body (110) to the center of the coupling axis of the first rotational coupling body (120). 2 The distance value (Lb) plus the length (L2) from one end of the body 210 for the second direction indication to the center of the coupling axis of the body 220 for the second rotational coupling, and measured by the rotation angle measurement module The distance (L) between two measurement points is calculated by trigonometric method using the calculated rotation angle (θ).

In the second mode, the user grips the first direction indicating body 110 with one hand and faces one measurement point (a) while holding the second direction indicating body 210 with the other hand. While pointing to the other measuring point (b).

The third distance calculation module 423 uses the first distance value and the second distance value as the distance value for the display using only the first distance value and the second distance value when the attitude determined by the attitude determination unit 410 is the third posture. Calculate.

When the rotation angle θ of the second rotation body 200 with respect to the first rotation body 100 measured by the rotation angle measurement module 300 is 180 °, the distance finder 10 is a third distance calculation module ( 423) is operated.

Referring to FIG. 7, in the case of the third posture, the distance meter operates in a third mode in which the third distance calculation module is executed, which is viewed on a path connecting the two measurement points (a, b) in a straight line. This is a measurement mode for measuring the distance value (L) between two measurement points while the distance meter is located. That is, this function can be used to measure the distance between the walls facing each other in a corridor or the like.

In the third mode, the first and second

rotation limiting jaws

121 and 221 are in contact with each other, so that the first direction body 110 and the second direction body 210 form a straight line and are in a third position in an unfolded state. And the posture of the distance meter 10 is fixed by the 2-1 magnetic coupling member 122 and the 2-2 magnetic coupling member 222. Therefore, the postures of the first rotating body 100 and the second rotating body 200 are not displaced, and the distance L between the two measurement points can be stably measured.

Therefore, if there is no separate external force, the distance meter 10 stably maintains the third position, and it is possible to operate the distance meter 10 with one hand. Therefore, it is possible for the user to use the other hand for different purposes, which makes measurement work very convenient.

When the range finder 10 is operated in the third mode, the first distance value La measured by the first laser distance measurement module 111 and the second distance value measured by the second laser distance measurement module 211 The distance (L) between the two measurement points is summed by adding the length (L12) from one end of the first direction indicating body 110 to one end of the second direction indicating body 210 to (Lb). Calculate.

In the third mode, since the complex operation using the trigonometry is not performed unlike in the second mode, since errors due to the trigonometry can be excluded, a very accurate result can be obtained.

The display distance value calculated by the display distance value calculation unit 420 is output to the display unit 123, and the result can be checked on the fly. Of course, the display unit 123 may also display information to determine in which mode the range finder is being measured.

On the other hand, the distance measuring device 10, the first and second laser distance measuring module (111,211), rotation angle measuring module 300, the control unit 400, a power supply such as a battery for supplying power to the display unit 123 (Not shown) is prepared.

The second laser power off module 430 cuts off the power supply of the second laser distance measuring module 211 from the power supply.

As described above, the distance meter 10 according to an embodiment of the present invention is used in three measurement modes. In particular, in the first mode and the third mode, the distance of the distance meter 10 can be fixed to measure the distance stably, and the method of measuring and calculating the distance value for the display according to the measurement mode is simple and clear. This enables more accurate and stable distance measurement.

The above description of the present invention is for illustration only, and those skilled in the art to which the present invention pertains may understand that the present invention can be easily modified to other specific forms without changing the technical spirit or essential features of the present invention. .

Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the above detailed description, and it should be interpreted that all changes or modified forms derived from the meaning and scope of the claims and equivalent concepts thereof are included in the scope of the present invention. do.

The present invention relates to a distance measuring device for measuring a distance to one measurement point or a distance between two measurement points.

Claims

The first direction indicating body formed in the form of a bar in order to indicate a direction and a first rotational coupling body provided at a rear end of the first direction indicating body formed with a first rotational limiting jaw Single acting body;

A second direction indicating body formed in a bar shape to indicate a direction and a rear end of the second direction indicating body are rotatably coupled to the first rotational coupling body and the first rotation limiting jaw It comprises a second rotational coupling body is formed in contact with the second rotational limiting jaw to limit the rotation, and the second rotational coupling body relative to the first rotational coupling body, The first posture and the body for the first direction indicating that the first direction body and the body for the second direction indication are in contact with each other while the angle between the body for the first direction indication and the body for the second direction is 0 °. The second posture in which the angle formed by the body for the second direction indication is greater than 0 ° and less than 180 °, and the angle between the body for the first direction indication and the body for the second direction indication is 180 °, and the first rotation limiting jaw Limited to the second round Second rotating body which are in contact with each other to select a third position one of the orientation of;

A first laser distance measuring module provided in the body for the first direction indication and measuring a first distance value that is a distance value to any one measurement point in a direction indicated by the first direction indication body;

A second laser distance measuring module provided on the body for the second direction indicating and measuring a second distance value that is a distance to another measurement point in a direction indicated by the body for the second direction indicating;

A rotation angle measurement module for measuring a rotation angle of the second rotation coupling body with respect to the first rotation coupling body;

The posture determination unit determines the posture of the first direction indicating body and the second direction indicating body according to the rotation angle measured by the rotation angle measurement module, which is one of the first, second and third postures, and the posture. If the attitude determined by the determination unit is the first attitude, the first distance calculation module and the attitude determination for calculating a value corresponding to the distance value to the one measurement point as the display distance value using only the first distance value A second distance calculation module for calculating a distance value between the two measurement points as the display distance value using the first distance value, the second distance value, and the rotation angle when the posture determined by the unit is the second posture; If the posture determined by the posture determination unit is in a third posture, the third distance is calculated by calculating the distance value between the two measurement points as the display distance value using only the first distance value and the second distance value. The display distance value calculator configured to execute any one of the modules according to the determination of the attitude determination unit, and if the attitude determined by the attitude determination unit is the first posture, cut off the power supply to the second laser distance measurement module A control unit comprising a second laser power cut-off module;

A display unit for visually displaying the display distance value calculated by the display distance value calculator;

A power supply unit for supplying power to the first laser distance measurement module, the second laser distance measurement module, the rotation angle measurement module, the control unit, and the display unit;

Distance measuring device having a plurality of measurement modes, characterized in that comprises a.
According to claim 1,

The 1-1 magnetic coupling member provided in a portion facing the second direction indicating body of the first direction indicating body, and provided in a portion facing the first direction indicating body of the second direction indicating body. A 1-1 magnetic coupling member and a 1-2 magnetic coupling member capable of magnetic coupling, a 2-1 magnetic coupling member provided at a portion of the first rotation restriction jaw facing the second rotation restriction jaw, and the second rotation A distance meter having a plurality of measurement modes, characterized in that it further comprises a 2-2 magnetic coupling member capable of magnetically coupling with the 2-1 magnetic coupling member provided at a portion facing the first rotational restriction jaw of the restriction jaw. .