WO2024071289A1

WO2024071289A1 - Leveling system, and laser receiver

Info

Publication number: WO2024071289A1
Application number: PCT/JP2023/035365
Authority: WO
Inventors: 武志菊池; 祐次高野
Original assignee: 株式会社トプコン
Priority date: 2022-09-30
Filing date: 2023-09-28
Publication date: 2024-04-04
Also published as: JP2024051267A

Abstract

According to the present invention, a height difference between measurement points is measured using a laser receiver. A leveling system (1) comprises a rotating laser device (10) for emitting a laser beam (B) horizontally at a predetermined height (H) from a measurement reference point, and a laser receiver (20) for receiving the laser beam at a measurement point, wherein the laser receiver: is provided with a first vertical light receiving tube (23), a second vertical light receiving tube (25) and a horizontal light receiving tube (24) which are arranged in an H-shape and each of which comprises light receiving units disposed at both ends of a light guide, and an arithmetic processing unit (31) connected to the light receiving units; identifies a collision position (235) of the laser beam from light reception signals of the light receiving units; detects differential distances of the collision position from a central position, and detects whether each differential distance is on a plus side or a minus side of a boundary at a central position in the length of each light guide; and measures a height difference of the measurement point relative to the measurement reference point in accordance with a combination of the plus/minus of each differential distance of the first vertical light receiving tube, the second vertical light receiving tube, and the horizontal light receiving tube.

Description

Leveling system and laser receiver

The present invention relates to a leveling system and a laser receiver for receiving and leveling horizontal laser light from a rotary laser device.

In surveying work such as architectural, civil engineering, and interior construction, a rotary laser device and a laser receiver are used for leveling. The rotary laser device is installed at the measurement reference point, has a rotating head equipped with a laser light source, and rotates the laser light horizontally at the reference height. The laser receiver detects the collision position of the laser light within a detection body equipped with a light receiving sensor, and detects the height (vertical) position of the laser receiver relative to the laser light. For example, Patent Document 1 discloses a laser receiver that calculates the height difference from the measurement reference point by providing multiple photodiodes as a light receiving sensor around a vertical axis and configuring the light receiving sensor to be movable in the vertical direction, so that the laser light is always received at the center position of the light receiving sensor in the height (vertical) direction.

JP 2020-169921 A

However, the laser receiver in Patent Document 1 required a ball screw linear motion mechanism to adjust the height of the light receiving sensor in order to calculate the height difference. Also, a tilt sensor was required to prevent errors caused by the tilt of the laser receiver.

The present invention was made to solve these problems, and aims to measure the elevation difference between measurement points without using a ball screw linear motion mechanism or tilt sensor.

In order to solve the above problem, the leveling system of the first aspect of the present invention comprises a rotary laser device that emits laser light horizontally at a predetermined height from a measurement reference point, and a laser receiver that receives the laser light at the measurement point. The laser receiver comprises a columnar light guide, light receiving units arranged at both ends of the light guide, and an optical coupling layer that divides the laser light toward both ends of the light guide, as a light receiving sensor. The system comprises a first vertical light receiving tube, a second vertical light receiving tube, and a horizontal light receiving tube arranged in an H shape, and a calculation processing unit connected to the light receiving units. The calculation processing unit identifies the collision position of the laser light from each light receiving signal of the light receiving units, detects the difference distance from the center position of the collision position and whether the difference distance is on the positive or negative side of the center position of the length of the light guide, and measures the height difference of the measurement point with respect to the measurement reference point according to the positive/negative combination of the difference distance of the first vertical light receiving tube, the second vertical light receiving tube, and the horizontal light receiving tube.

In the leveling system of the second aspect, in the first aspect, when the differential distances of the first vertical light receiving tube and the second vertical light receiving tube are the same value and both are negative values, the calculation processing unit detects that the measurement point X has become higher than the measurement reference point by an amount equal to the differential distance, and when the differential distances of the first vertical light receiving tube and the second vertical light receiving tube are the same value and both are positive values, it is also preferable to detect that the measurement point X has become lower than the measurement reference point by an amount equal to the differential distance.

In the leveling system of the third aspect, in the first aspect, the calculation processing unit detects that the laser receiver is tilted to the left and the measurement point is lower than the measurement reference point by the height change h calculated by formula 1 when the difference distance of the first vertical light receiving tube is a positive value, the difference distance of the second vertical light receiving tube is a negative value, and the difference distance of the horizontal light receiving tube is a positive value, and detects that the laser receiver is tilted to the left and the measurement point is lower than the measurement reference point by the height change h calculated by formula 1 when the difference distance of the first vertical light receiving tube is a positive value, the difference distance of the second vertical light receiving tube is a negative value, and the difference distance of the horizontal light receiving tube is a negative value. When the difference distance of the first vertical light receiving tube is a negative value, the difference distance of the second vertical light receiving tube is a positive value, and the difference distance of the horizontal light receiving tube is a negative value, the laser receiver is tilted to the right and the measurement point is lowered by the height change h calculated by formula 1 relative to the measurement reference point. When the difference distance of the first vertical light receiving tube is a negative value, the difference distance of the second vertical light receiving tube is a positive value, and the difference distance of the horizontal light receiving tube is a positive value, the laser receiver is tilted to the right and the measurement point is higher by the height change h calculated by formula 1 relative to the measurement reference point.

In the leveling system of the fourth aspect, in any of the first to third aspects, it is also preferable that the radius of the light guide of the horizontal light receiving tube is larger than the radius of the first vertical light receiving tube and the second vertical light receiving tube.

In the fifth aspect of the leveling system, in any of the first to third aspects, it is also preferable that the number of horizontal light receiving tubes is increased in the height direction.

The sixth aspect of the laser receiver is a laser receiver that receives at a measurement point a laser beam emitted horizontally at a predetermined height from a measurement reference point, and the laser receiver includes a columnar light guide, light receiving sections arranged at both ends of the light guide, and an optical coupling layer that divides the laser beam toward both ends of the light guide, as a light receiving sensor. The laser receiver includes a first vertical light receiving tube, a second vertical light receiving tube, and a horizontal light receiving tube arranged in an H shape, and a calculation processing section connected to the light receiving sections. The calculation processing section identifies the collision position of the laser beam from each light receiving signal of the light receiving sections, detects the difference distance from the center position of the collision position and whether the difference distance is on the positive or negative side of the center position of the length of the light guide, and preferably measures the difference in height of the measurement point relative to the measurement reference point according to the positive/negative combination of the difference distance of the first vertical light receiving tube, the second vertical light receiving tube, and the horizontal light receiving tube.

According to the present invention, the height difference between measurement points can be measured in a laser receiver for leveling without using a ball screw linear motion mechanism or tilt sensor.

1 is an external perspective view of a leveling system according to an embodiment of the present invention. FIG. 2 is a front perspective view of a receiver of the leveling system. 4 is a diagram illustrating a light receiving sensor of a light receiver of the leveling system. FIG. 13A to 13C are diagrams illustrating detection of a change in height when the light receiver of the leveling system is not tilted. 10A to 10C are diagrams illustrating detection of changes in left and right tilt by a light receiver of the leveling system. 3 is an example of a left/right tilt detection table for the leveling system. 13A to 13C are diagrams illustrating detection of a change in height when the light receiver of the leveling system is tilted. FIG. 2 is a configuration block diagram of the leveling system. FIG. 11 is a front perspective view of a receiver according to a modified example of the leveling system.

Next, a preferred embodiment of the present invention will be described with reference to the drawings. In the following description of the embodiment, the same names will be used for similar configurations, and duplicate descriptions will be omitted as appropriate.

FIG. 1 is an external perspective view of a leveling system 1 according to an embodiment of the present invention, and FIG. 2 is a front perspective view of a receiver 20. The leveling system 1 includes a rotary laser device 10 and a laser receiver (hereinafter simply referred to as the receiver) 20.

The rotary laser device 10 has a rotary head 11 equipped with a laser light source such as a light emitting diode (LED), a semiconductor laser (LD), or an SLED (Super Luminescent Diode). The rotary laser device 10 is erected on a measurement reference point RP on the ground via a leveling stand, and the rotary head 11 is rotated to rotate the laser light B so as to revolve around a horizontal reference plane 12 that is at a height H used for leveling from the measurement reference point RP. The rotary head 11 emits pulsed light that is intensity modulated to a predetermined frequency as the laser light B. The receiver 20 is supported by an operator W by a handle 22 directly above the measurement point X, as shown in FIG. 1. Alternatively, it may be supported by a known fixture on a support member such as a pole or a staff erected at the measurement point X.

As shown in FIG. 2, the receiver 20 includes a case 21, a handle 22, a first vertical receiver tube 23, a horizontal receiver tube 24, a second vertical receiver tube 25, a display unit 26, an operation unit 27, and a light-emitting indicator 28. The first vertical receiver tube 23, the horizontal receiver tube 24, the second vertical receiver tube 25, the display unit 26, and the operation unit 27 are arranged on the front of the case 21. The light-emitting indicator 28 is arranged in a position that is easily visible to the operator W, such as on the top surface of the case 21. The handles 22 are arranged in a pair on the left and right on the rear surface of the case 21 (the left handle cannot be seen when viewed from the front in FIG. 2). The first vertical receiver tube 23, the horizontal receiver tube 24, and the second vertical receiver tube 25 are the light-receiving sensors of the receiver 20. The display unit 26 and the operation unit 27 are arranged in the margins of the above-mentioned light-receiving sensors.

The receiver 20 is equipped with a first vertical receiver tube 23, a horizontal receiver tube 24, and a second vertical receiver tube 25, which are light receiving sensors, arranged in an "H" shape. In detail, as shown in FIG. 2, the central axis of the horizontal receiver tube 24 is aligned with the central position M of the length L of each of the first vertical receiver tube 23 and the second vertical receiver tube 25, and they are arranged in an "H" shape so that the receiver center C is at the central position M of the length L of the horizontal receiver tube 24. The central position M of the first vertical receiver tube 23 and the second vertical receiver tube 25, the central position M of the horizontal receiver tube 24, and the position of the receiver center C in the horizontal receiver tube 24 are measured in advance and stored as known values in a memory unit 33 described later.

The first vertical light receiving tube 23 and the second vertical light receiving tube 25 are arranged with their axial direction vertical, while the horizontal light receiving tube 24 is arranged with their axial direction horizontal, and all have the same configuration, so the configuration of the light receiving sensor will be explained using the first vertical light receiving tube 23. Figure 3 is a diagram explaining the light receiving sensor (first vertical light receiving tube 23) of the receiver 20, and is a diagram showing the side of the first vertical light receiving tube 23. In Figure 3, the left is the front of the case 21, which is the side that receives the laser light B.

The first vertical light receiving tube 23 includes a cylindrical light guide 231, a light receiving section 232 arranged at one end of the light guide 231, and a light receiving section 233 arranged at the other end. The light receiving sections 232 and 233 are photodiodes, avalanche photodiodes (APDs), or equivalent photoelectric conversion elements. The light receiving signals detected by the light receiving sections 232 and 233 are processed by the calculation processing section 31 described later. The material of the light guide 231 is not limited as long as it guides the laser light B inside the body, but it is, for example, transparent glass or quartz, or a resin such as acrylic or polycarbonate. The light guide 231 is formed in a cylindrical shape, an elliptical cylinder, or a cylinder capable of guiding light by total reflection, with a specified length L in the axial direction. An optical coupling layer 234 is formed on the light guide 231 (see cross-sectional view). The optical coupling layer 234 couples the laser light B to the light guide 231 using the principles of light diffraction, refraction, scattering, reflection, dispersion, and/or fluorescence (the laser light is not reflected outside the light guide, but is incident on the light guide). The optical coupling layer 234 is formed, for example, by applying a paint having fluorescent particles dispersed in a solution to the surface of the light guide 231, or by providing a resin layer containing fluorescent particles on the surface of the light guide 231.

3, when laser light B collides with light guide 231, at collision position 235, laser light B is coupled into light guide 231 by optical coupling layer 234 and split into laser light B1 traveling toward one light receiving section 232 and laser light B2 traveling toward the other light receiving section 233 in the opposite direction. If collision position 235 is the central position M of light guide 231 in the axial direction, distance L1 guided by laser light B1 and distance L2 guided by laser light B2 are the same, so the waveforms of the light receiving signals of light receiving sections 232 and 233 match. However, if collision position 235 is shifted from central position M of light guide 231, distances L1 and L2 guided by laser light B1 and B2 are different, so a shift occurs in the waveforms of the light receiving signals of light receiving sections 232 and 233. For example, in FIG. 3, the collision position 235 is above the center position M of the light guide 231, and because the distance L1 is shorter than the distance L2, a delay occurs in the light receiving signal of the light receiving unit 233 relative to the light receiving signal of the light receiving unit 232. The calculation processing unit 31 calculates the distances L1 and L2 from the time difference or phase difference between these light receiving signals, the specified length L, and the light transmission speed of the light guide 231 to identify the collision position 235. In addition, the calculation unit 31 calculates which side of the center position M the collision position 235 is on and the differential distance D from the center position M of the collision position 235 from the specified length L and the distance L1 or L2. For example, in FIG. 3, D is calculated from L/2-L1 or L2-L/2.

FIG. 4 is a diagram for explaining the detection of height changes when the receiver 20 is not tilted. When the receiver 20 is not tilted, as shown in FIG. 4(1), when the height of the receiver center C is above the laser light B, the collision position 235 of both the first vertical receiver tube 23 and the second vertical receiver tube 25 shifts below the center position M, causing a shift in the light receiving signals at the respective light receiving units 232, 233 and light receiving units 252, 253, and negative differential distances D23, D25 are detected on the lower light receiving unit 233 (253) side relative to the center position M. As shown in FIG. 4(2), when the height of the receiver center C is below the laser light B, the collision position 235 of both the first vertical receiver tube 23 and the second vertical receiver tube 25 shifts above the center position M, and positive differential distances D23, D25 are detected on the upper light receiving unit 232 (252) side relative to the center position M.

In other words, when the differential distances D23, D25 of the first vertical light receiving tube 23 and the second vertical light receiving tube 25 are the same and both are negative values, the height of the light receiving device 20 (center C of the light receiving device) has moved upward by the differential distance D23 (D25) based on the height H of the laser light B, and it can be seen that the measurement point X has become higher by the differential distance D, which is the same amount as D23 (D25), relative to the measurement reference point RP. When the differential distances D23, D25 of the first vertical light receiving tube 23 and the second vertical light receiving tube 25 are the same and both are positive values, the height of the light receiving device 20 (center C of the light receiving device) has moved downward by the differential distance D23 (D25), and it can be seen that the measurement point X has also become lower by the same amount D as D23 (D25) relative to the measurement reference point RP.

Figures 5 to 7 are diagrams explaining the detection of height changes when the receiver 20 is tilted. First, Figure 5 is a diagram explaining the detection of left/right tilt changes by the receiver 20. When the receiver 20 is tilted to the left as shown in Figure 5 (1), the collision position 235 in the first vertical receiver tube 23 shifts above the center position M, and a positive difference distance D23 is detected on the upper receiver 232 side relative to the center position M, while the collision position 235 in the second vertical receiver tube 25 shifts below the center position M, and a negative difference distance D25 is detected on the lower receiver 253 side relative to the center position M. As shown in FIG. 5 (2), when the light receiver 20 is tilted to the right, the collision position 235 in the first vertical light receiver tube 23 shifts downward from the center position M, and a negative differential distance D23 is detected toward the light receiver 233 below the center position M, while the collision position 235 in the second vertical light receiver tube 25 shifts upward from the center position M, and a positive differential distance D25 is detected toward the light receiver 252 above the center position M.

In other words, if the difference distance D23 of the first vertical light receiving tube 23 is a positive value and the difference distance D25 of the second vertical light receiving tube 25 is a negative value, it is understood that the light receiver 20 is tilted to the left. If the difference distance D23 of the first vertical light receiving tube 23 is a negative value and the difference distance D25 of the second vertical light receiving tube 25 is a positive value, it is understood that the light receiver 20 is tilted to the right.

In this case, the difference distance D23 (D25) becomes longer as the left-right tilt increases, and it can be seen that the difference distance D23 (D25) and the tilt angle δ have a one-to-one correspondence. Therefore, by creating a left-right tilt detection table 342 that stores the correspondence between the difference distance D23 (D25) and the left-right tilt angle δ, the left-right tilt angle δ can be calculated according to the value of the difference distance. FIG. 6 shows an example of the left-right tilt detection table 342 when the resolution is set to 0.5 mm units. In the left-right tilt detection table 342, the center position M of the vertical light receiving tube 23 (25) is set to 0 [mm], the difference distance D23 (D25) detected on the upper light receiving unit 232 (252) side with respect to the center position M as a positive value, and the difference distance D23 (D25) detected on the lower light receiving unit 233 (253) side with respect to the center position M as a negative value, and the tilt angle δ corresponding to each difference distance D23 (D25) is stored.

By knowing the left and right tilt angle δ from the above, it is possible to detect the change in height when the receiver 20 is tilted. Figure 7 is a diagram explaining the detection of the change in height when the receiver 20 is tilted. If the height of the receiver 20 changes while the receiver 20 is tilted left or right, the collision position 235 of the laser light B on the horizontal receiver tube 24 shifts from the central position M, causing a shift in the received light signals at the light receiving sections 242, 243 of the horizontal receiver tube 24, and the differential distance D24 from the central position M is detected. The change in height h of the receiver center C can be found from Equation 1 using trigonometric functions.

where h is the change in height, D is the difference in distance detected by the horizontal receiver, and δ is the inclination angle of the laser receiver in the left-right direction.

Furthermore, if the left light receiving unit 242 side is negative and the right light receiving unit 243 side is positive with respect to the center position M of the horizontal light receiving tube 24, when the light receiving unit 20 is tilted to the left and the collision position 235 is shifted above the center C of the light receiving unit, as shown in FIG. 7 (1), the differential distance D24 will have a positive value on the light receiving unit 243 side. When the light receiving unit 20 is tilted to the left and the collision position 235 is shifted below the center C of the light receiving unit, as shown in FIG. 7 (2), the differential distance D24 will have a negative value on the light receiving unit 242 side. When the light receiving unit 20 is tilted to the right and the collision position 235 is shifted above the center C of the light receiving unit, as shown in FIG. 7 (3), the differential distance D24 will have a negative value on the light receiving unit 242 side. As shown in FIG. 7 (4), if the receiver 20 is tilted to the right and the collision position 235 is shifted below the receiver center C, the differential distance D24 will be a positive value on the receiver 243 side.

In other words, whether the tilt is to the left or right can be detected from the positive or negative differential distance of the first vertical light receiving tube 23 and the second vertical light receiving tube 25. Therefore, in Figure 7 (1): when a positive differential distance D24 is obtained from the horizontal light receiving tube 24 tilted to the left, and in Figure 7 (3): when a negative differential distance D24 is obtained from the horizontal light receiving tube 24 tilted to the right, it can be seen that the height of the light receiving device 20 (its center C of the light receiving device) has moved downward by the height change h calculated by equation 1 based on the height H of the laser light B, and therefore the measurement point X has also become lower by the height change h relative to the measurement reference point RP. In Figure 7 (2): when a negative differential distance D24 is obtained with the horizontal light receiving tube 24 tilted to the left, and in Figure 7 (4): when a positive differential distance D24 is obtained with the horizontal light receiving tube 24 tilted to the right, the height of the light receiving device 20 (the center C of the light receiving device) has moved upward by the height change h calculated by Equation 1, based on the height H of the laser light B, so it can be seen that the measurement point X has also become higher by the height change h relative to the measurement reference point RP.

With the above in mind, FIG. 8 is a block diagram of the leveling system 1. As described above, the rotary laser device 10 is equipped with a rotary head 11 that emits laser light B. The receiver 20 is equipped with an arithmetic processing unit 31, a buzzer 32, a memory unit 33, light receiving units (of the first vertical light receiving tube 23) 232, 233, light receiving units (of the second vertical light receiving tube 25) 252, 253, light receiving units (of the horizontal light receiving tube 24) 242, 243, a display unit 26, an operation unit 27, and a light emitting indicator 28.

The display unit 26 is a liquid crystal or organic EL display that displays tilt detection and height change detection. The operation unit 27 is a button or switch that can be used to perform operations for tilt detection and height change detection. The light receiving units 232, 233 (of the first vertical light receiving tube 23), the light receiving units 252, 253 (of the second vertical light receiving tube 25), and the light receiving units 242, 243 (of the horizontal light receiving tube) are as described above, and each sends a light receiving signal to the calculation processing unit 31.

The light-emitting indicator 28 and the buzzer 32 are controlled by the calculation processing unit 31 (the alignment unit 311 described later) to flash and/or emit a signal sound to guide the user to align the rotary laser device 10 and the receiver 20.

The storage unit 33 includes RAM and ROM as main storage devices, and a HDD (Hard Disc Drive) as an auxiliary storage device. The storage unit 33 stores the various processing programs executed by the arithmetic processing unit 31.

The arithmetic processing unit 31 includes an integrated circuit in which at least a CPU (Central Processing Unit) and memory (RAM (Random Access Memory), ROM (Read Only Memory), etc.) are implemented in an integrated circuit, a collection of integrated circuits, a microcontroller, or a microprocessor.

The calculation processing unit 31 has the functional units of an alignment unit 311 and a tilt/height change detection unit 312. Each functional unit is composed of electronic circuits such as a CPU, an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device) such as an FPGA (Field Programmable Gate Array), etc.

The tilt/height change detection unit 312 receives light receiving signals from the light receiving sections 232, 233, 242, 243, 252, and 253 of the first vertical light receiving tube 23, horizontal light receiving tube 24, and second vertical light receiving tube 25, respectively, and detects the respective difference distances D23, D24, and D25, including whether they are positive or negative values, to measure the difference in elevation at measurement point X.

As explained in FIG. 4(1), when the differential distances D23, D25 of the first vertical light receiving tube 23 and the second vertical light receiving tube 25 are the same and both are negative values, the tilt/height change detection unit 312 detects that the measurement point X has become higher by the differential distance D relative to the measurement reference point RP (detection pattern 4-1). As explained in FIG. 4(2), when the differential distances D23, D25 of the first vertical light receiving tube 23 and the second vertical light receiving tube 25 are the same and both are positive values, the tilt/height change detection unit 312 detects that the measurement point X has become lower by the differential distance D relative to the measurement reference point RP (detection pattern 4-2).

7(1), when the differential distance D23 of the first vertical light receiving tube 23 is a positive value, the differential distance D25 of the second vertical light receiving tube 25 is a negative value, and the differential distance D24 of the horizontal light receiving tube 24 is a positive value, the tilt/height change detection unit 312 detects that the light receiver 20 is tilted to the left and the measurement point X has become lower by the height change h relative to the measurement reference point RP (detection pattern 7-1). As explained in FIG. 7(2), when the differential distance D23 of the first vertical light receiving tube 23 is a positive value, the differential distance D25 of the second vertical light receiving tube 25 is a negative value, and the differential distance D24 of the horizontal light receiving tube 24 is a negative value, the tilt/height change detection unit 312 detects that the light receiver 20 is tilted to the left and the measurement point X has become higher by the height change h relative to the measurement reference point RP (detection pattern 7-2). As explained in (3) of FIG. 7, when the difference distance D23 of the first vertical light receiving tube 23 is a negative value, the difference distance D25 of the second vertical light receiving tube 25 is a positive value, and the difference distance D24 of the horizontal light receiving tube 24 is a negative value, the light receiver 20 is tilted to the right, and the measurement point X is detected to be lower than the measurement reference point RP by the height change h (detection pattern 7-3). As explained in (4) of FIG. 7, when the difference distance D23 of the first vertical light receiving tube 23 is a negative value, the difference distance D25 of the second vertical light receiving tube 25 is a positive value, and the difference distance D24 of the horizontal light receiving tube 24 is a positive value, the light receiver 20 is tilted to the right, and the measurement point X is detected to be higher than the measurement reference point RP by the height change h (detection pattern 7-4).

The alignment unit 311 aligns the rotary laser device 10 and the receiver 20, i.e., aligns the laser light B and the receiver center C, by placing the receiver 20 close to the rotary laser device 10 when starting to measure the height difference so that the tilt/height change detection unit 312 can perform the above detection. The operator W holds the receiver 20 upright and horizontally using a horizontal bubble tube (not shown) as a guide, and issues an instruction for alignment from the operation unit 27. If the laser light B does not collide with the receiver center C, the alignment unit 311 guides the difference from the receiver center C (the difference in the vertical direction can be detected by the vertical receiver tube 23, and the difference in the horizontal direction can be detected by the horizontal receiver tube 24) up, down, left and right on the display unit 26 using arrows or the like to the range where measurement is possible, and also notifies the operator W by flashing the light-emitting indicator 28 and/or sounding a signal from the buzzer 32.

After alignment, the alignment unit 311 constantly detects whether a light reception signal is received from the light receiving units 242, 243 of the horizontal light receiving tube 24 so that the tilt/height change detection unit 312 can perform the above detection pattern 7-1 to detection pattern 7-4. If a light reception signal is not received, the above detection pattern 7-1 to detection pattern 7-4 cannot be performed, so the light emitting indicator 28 flashes and/or the buzzer 32 sounds a signal.

As described above, according to this embodiment of the leveling system 1, the receiver 20 is equipped with a pair of first vertical receiver tubes 23 and second vertical receiver tubes 25 and a horizontal receiver tube 24 arranged in an H-shape as light receiving sensors, so that by looking at the positive/negative detection patterns of each received light signal, it is possible to determine whether or not the receiver 20 is tilted, and an accurate height difference can be measured according to each detection pattern.

In addition, as a preferred modification of this embodiment, since the tilt/height change detection unit 312 can determine whether the tilt is to the left or right, it is also preferred to notify the worker W of the tilt direction by using any one or a combination of the display unit 26, buzzer 32, and light-emitting indicator 28. In this case, it is also preferred that the signal sound, lighting color, or flashing pattern be changed in relation to the previous alignment.

Furthermore, as shown in FIG. 9(1), it is preferable to make the radius d24 of the horizontal light receiving tube 24 larger than the radii d23, d25 of the vertical light receiving tubes 23, 25 so that the inclination/height change detection unit 312 can perform the above detection patterns 7-1 to 7-4, thereby widening the incidence range of the laser light B, i.e., the measurable range MA. Alternatively, as shown in FIG. 9(2), it is preferable to increase the number of horizontal light receiving tubes 24 in the height direction so that a light receiving signal can be obtained from any of the horizontal light receiving tubes 24, thereby widening the incidence range of the laser light B, i.e., the measurable range MA. This allows the above detection patterns 7-1 to 7-4 to function even in sites with large elevation differences.

The above describes preferred embodiments and modifications of the present invention, but the above is merely an example of the present invention, and these can be combined based on the knowledge of those skilled in the art, and such forms are also included in the scope of the present invention.

LIST OF SYMBOLS 1 Leveling system 10 Rotary laser device 11 Rotating head 12 Horizontal reference surface 20 Laser receiver 21 Case 22 Handle 23 First vertical light receiving tube 231 Light guide 232 Light receiving section 233 Light receiving section 234 Optical coupling layer 235 Collision position 24 Horizontal light receiving tube 242 Light receiving section 243 Light receiving section 25 Second vertical light receiving tube 252 Light receiving section 253 Light receiving section 26 Display section 27 Operation section 28 Light emitting indicator 31 Arithmetic processing section 311 Positioning section 312 Tilt/height change detection section 313 Height error correction section 32 Buzzer 33 Memory section 342 Left/right tilt detection table

Claims

A rotary laser device that emits a laser beam horizontally at a predetermined height from a measurement reference point, and a laser receiver that receives the laser beam at a measurement point,
The laser receiver includes a columnar light guide as a light receiving sensor, light receiving units arranged at both ends of the light guide, and an optical coupling layer that divides the laser light toward both ends of the light guide, and includes a first vertical light receiving tube, a second vertical light receiving tube, and a horizontal light receiving tube arranged in an H shape, and a calculation processing unit connected to the light receiving units.
The arithmetic processing unit is
identifying a collision position of the laser light from each light receiving signal of the light receiving unit, and detecting a difference distance from the center position of the collision position and whether the difference distance is on the plus side or the minus side of the center position of the length of the light guide;
A leveling system characterized by measuring the elevation difference of the measurement point relative to the measurement reference point according to a plus/minus combination of the differential distances of the first vertical light receiving tube, the second vertical light receiving tube, and the horizontal light receiving tube.
The arithmetic processing unit is
When the difference distance between the first vertical light receiving tube and the second vertical light receiving tube is the same value and both are negative values, it is detected that the measurement point X is higher than the measurement reference point by the same amount as the difference distance,
The leveling system according to claim 1, characterized in that, when the differential distances of the first vertical light receiving tube and the second vertical light receiving tube are the same value and both are positive values, it is detected that the measurement point X is lower than the measurement reference point by an amount equal to the differential distance.
The arithmetic processing unit is
When the difference distance of the first vertical light receiving tube is a positive value, the difference distance of the second vertical light receiving tube is a negative value, and the difference distance of the horizontal light receiving tube is a positive value, the laser receiver is tilted to the left, and it is detected that the measurement point is lower than the measurement reference point by a height change h calculated by Equation 1;
When the difference distance of the first vertical light receiving tube is a positive value, the difference distance of the second vertical light receiving tube is a negative value, and the difference distance of the horizontal light receiving tube is a negative value, the laser receiver is tilted to the left, and it is detected that the measurement point is higher than the measurement reference point by a height change h calculated by Equation 1;
When the difference distance of the first vertical light receiving tube is a negative value, the difference distance of the second vertical light receiving tube is a positive value, and the difference distance of the horizontal light receiving tube is a negative value, the laser receiver is tilted to the right, and it is detected that the measurement point is lower than the measurement reference point by a height change h calculated by Equation 1;
The leveling system of claim 1, characterized in that when the difference distance of the first vertical light receiving tube is a negative value, the difference distance of the second vertical light receiving tube is a positive value, and the difference distance of the horizontal light receiving tube is a positive value, the laser receiver is tilted to the right and it is detected that the measurement point has become higher than the measurement reference point by a height change h calculated by equation 1.
where h is the change in height, D is the difference in distance detected by the horizontal receiver, and δ is the inclination angle of the laser receiver in the left-right direction.
The leveling system of claim 1, characterized in that the radius of the light guide of the horizontal light receiving tube is configured to be larger than the radius of the first vertical light receiving tube and the second vertical light receiving tube.
The leveling system according to claim 1, characterized in that the number of horizontal light receiving tubes is increased in the height direction.
A laser receiver that receives at a measurement point a laser beam that is horizontally emitted at a predetermined height from a measurement reference point,
The laser receiver includes a columnar light guide as a light receiving sensor, light receiving units arranged at both ends of the light guide, and an optical coupling layer that divides the laser light toward both ends of the light guide, and includes a first vertical light receiving tube, a second vertical light receiving tube, and a horizontal light receiving tube arranged in an H shape, and a calculation processing unit connected to the light receiving units.
The arithmetic processing unit is
identifying a collision position of the laser light from each light receiving signal of the light receiving unit, and detecting a difference distance from the center position of the collision position and whether the difference distance is on the plus side or the minus side of the center position of the length of the light guide;
A laser receiver characterized by measuring the elevation difference of the measurement point relative to the measurement reference point according to the plus/minus combination of the differential distances of the first vertical light receiving tube, the second vertical light receiving tube, and the horizontal light receiving tube.