JPH0942965A - Surveying laser device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inform a setting worker of the time during the carry-out of the releveling, that is not a failure of a device by detecting the angle of inclination against the vertical direction of a light projecting unit, and tilting the light projecting unit so that a rotary shaft thereof is arranged along the vertical direction. SOLUTION: The leveling work is performed by tilting a tilting arm 29 with the rotation of a level adjusting motor 33 on the basis of the driving signal from a microcomputer, and tilting a rotary light projecting unit 15 in the appropriate direction. During this leveling work, a microcomputer 53 always monitors the output from level detecting sensors 57, 59 and a first threshold value stored in the ROM. When the microcomputer judges that the angle of inclination of the rotary light projecting unit 15 against the vertical direction exceeds the first threshold value, the microcomputer informs that the leveling operation is moved from the rough leveling to the intermediate leveling with the intermittent light emission. When the microcomputer judges that the angle of inclination exceeds a second threshold value, the microcomputer informs that the leveling work is moved form the intermediate leveling to the fine leveling with the continuous light emission of a diode 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser surveying device that scans a laser beam for surveying by a light projecting unit that rotates about a rotation axis.

[0002]

2. Description of the Related Art Generally, in the field of civil engineering and construction, a light projecting unit for emitting a laser beam is rotated around a rotation axis to scan the laser beam toward an object to be surveyed around the main body of the apparatus, and to make a horizontal plane. A laser surveying device (a so-called laser planer) that forms substantially parallel reference planes is used to measure the height of the spot of the laser light flux that has reached the object to be surveyed, thereby performing reference determination and height measurement.

Such a laser surveying instrument is often used outdoors. For this reason, the tripod supporting the laser surveying instrument may tilt due to strong winds, or when a large-sized work machine is operated near the surveying instrument. In that case, the reference plane formed by the scanning laser light is tilted, and unlike the initially set angle, accurate reference alignment and height measurement cannot be performed.

The conventional laser surveying instrument has an automatic leveling function for correcting the posture of the instrument in such a case. This is because while the main power supply is turned on, the projection unit is tilted, its rotation axis is aligned in a substantially vertical direction, and the leveling operation is once terminated, and then while continuously monitoring the tilt angle of the projection unit during surveying work, This is a function to perform the leveling operation again when the tilt angle exceeds the allowable value. In the laser surveying device having such a function, if the laser beam is projected as it is when the tilt angle of the light projecting portion exceeds the allowable value, erroneous measurement may be caused. Has stopped.

When such a laser surveying device is used, for example, at a construction site where a large working machine is used near the device, a minute tilt angle displacement frequently occurs in the light projecting portion, so that the laser light beam projected continuously is generated. It will stop frequently. For this reason, the setting worker who has a laser receiver and is working away from the laser surveying device wonders whether the cause is re-leveling or a device failure every time the laser projection stops.
I often misidentified it as a failure and left the place and returned to the device. Due to such interruption of work, work efficiency has deteriorated.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a laser surveying instrument capable of informing a setting worker that a re-leveling operation is being performed instead of a failure of the instrument based on the above problems of the conventional laser surveying instrument. With the goal. Further, the present invention is
An object of the present invention is to provide a laser surveying device that allows a setting worker to recognize the current situation from the time when the main power is turned on until the leveling operation is once completed.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention comprises a light projecting portion rotatable about a rotation axis which should be along a substantially vertical direction, and a laser light source for giving a laser beam to this light projecting portion. In the laser surveying device, wherein the projection unit is rotated to project the laser light flux from the laser light source in a direction substantially orthogonal to the rotation axis to form a reference plane substantially parallel to the horizontal plane, the vertical direction of the projection unit. A detection sensor for detecting an inclination angle with respect to a direction; a leveling drive means for tilting the light projecting portion so that its rotation axis extends along a substantially vertical direction; and a leveling operation by the leveling drive means once completed. Leveling control means for outputting a drive signal to the leveling drive means for re-leveling when the tilt angle detected by the detection sensor exceeds an allowable value; the leveling based on the drive signal from the leveling control means. When the driving means starts driving, Switching the laser light flux of the laser light source which emits intermittent light emission, when the re-leveling of the light projecting portion is completed, the light emitting operation switching means for returning the tomographic secondary light continuously emitted;
It is characterized by having.

Further, according to the present invention, a light projecting portion rotatable about a rotation axis which should be along a substantially vertical direction and a laser light source for giving a laser beam to the light projecting portion are provided, and the light projecting portion is rotated. In the laser surveying device for rotating and projecting the laser light flux from the laser light source in a direction substantially orthogonal to the rotation axis to form a reference plane substantially parallel to the horizontal plane, detection for detecting the inclination angle of the light projecting portion with respect to the vertical direction A sensor; a leveling drive means for tilting the light projecting portion so that its rotation axis extends in a substantially vertical direction; and a leveling control means for outputting a drive signal to the leveling drive means when a main power source is turned on. After the start of the leveling operation by the leveling driving means, when the tilt angle detected by the detection sensor exceeds the first threshold value, the laser light beam from the laser light source is intermittently emitted and exceeds the second threshold value. Switch the intermittent flash to continuous flash That the light emitting operation switching means; it is characterized by comprising a.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to illustrated embodiments. FIG. 6 is a sectional view showing the entire laser surveying instrument to which the present invention is applied.

In FIG. 1, the laser surveying device 11 has a housing 12 and a light projecting device 13 provided inside the housing 12. A transparent member 16 surrounding a rotary light projecting unit 15 above the light projecting device 13 is fixed above the housing 12 in the figure, and below the laser surveying device 1 below.
A battery case 18 that houses the first driving battery 17 is fixed. Also, this battery case 1
A microcomputer (hereinafter referred to as a microcomputer) 53 is provided on the upper part of the unit 8.

A red warning display LED 9 and a power switch (main switch) 10 are provided on the side wall of the housing 12. The warning display LED 9 is adapted to emit light from an opening formed in the side wall of the housing 12, and the power switch 10 is provided in the housing 12.
The switch can be operated from outside. The housing 12 has a sliding guide portion 1 having a substantially conical shape at the center of the upper portion.
9, and the slide guide portion 19 has a slide hole 19a at the bottom. The inner diameter formed by the tip of the sliding hole 19a is
It is set to be smaller than the outer diameter of the spherical surface portion of the bulging portion 21 described later.

The light projecting device 13 has a hollow member 20 having a hollow portion extending in the vertical direction in FIG. 6, and the rotary light projecting unit 15 rotatably supported above the hollow member 20 via a bearing 22. And have. The bulging portion 21 included in the hollow member 20 is configured such that the rotary light projecting portion 15 (light projecting device 13) is rotated by the rotary shaft a while the spherical portion is brought into contact with the sliding hole 19a.
It is tilted in all directions around and is supported so that the reference plane formed by the projection laser beam L ₃ can be freely adjusted with respect to the horizontal plane.

The hollow member 20 is internally provided with a laser beam optical path 20.
a. A laser diode (laser light source) 23 that emits a laser beam is provided in the lower portion communicating with the laser light optical path 20a. An objective lens 24 is fixed in the laser beam optical path 20a in the upper part of the figure.

The rotary light projecting unit 15 has its center at the laser beam optical path 2
0a which is aligned with the center of 0a and continues to the optical path 20a
5a and a pentaprism accommodating portion 15b which is continuous with the circular hole 15a and has a larger diameter than the circular hole 15a and which is open upward. A light projecting window 26 in which a transparent member 25 is fitted is provided on the side wall of the pentaprism storage portion 15b. In the pentaprism storage portion 15b, the pentaprism 27 fixed rotatably integrally with the rotary light projecting portion 15 reflects the laser light flux along the rotation axis a by a plurality of reflecting surfaces to deflect it by approximately 90 °, and projects it. The light is projected from the light window 26 to the outside of the device.

The hollow member 20 integrally has a tilting arm 29 extending leftward in FIG. 6 and a tilting arm 30 (see FIG. 7) orthogonal to the tilting arm 29 in the depth direction of the drawing. ing. The tilting arm 29 is formed so as to be tilted downward from the upper portion of the bulging portion 21, and has a parallel pin 31 at the tip end that is aligned with the spherical center of the bulging portion 21. The tilting arm 30 is also formed in the same manner as the tilting arm 29, and at the tip end,
It has a parallel pin 32 (see FIG. 7) that is aligned with the spherical center of the bulging portion 21.

A bracket 35 for supporting the level adjusting motor 33 is provided on the inner wall of the housing 12.
The bracket 35 has a gear support hole 35a through which the rotary shaft of the level adjusting motor 33 is inserted, and a gear support hole 35b through which the lower end of the tilting screw 37 is rotatably fitted.
Are formed. A gear support hole 12a is formed in the upper wall of the housing 12 so as to face the gear support hole 35b and rotatably fit the upper end of the tilting screw 37. The pinion 36 fixed to the rotary shaft of the level adjusting motor 33 meshes with the transmission gear 39 fixed to the lower end of the tilting screw 37. This tilting screw 37
An adjusting nut 40, which constitutes a feed screw mechanism together with the screw 37, is screwed into the. This adjustment nut 4
0 is restricted in relative rotation with respect to the housing 12 by the linear guide mechanism 41 composed of the projection 41a and the linear guide groove 41b (see FIG. 7), and the operation pin 42 that abuts the parallel pin 31 from above is fixed to the outer periphery. Have

A bracket 43 (see FIG. 7) similar to the bracket 35 is provided on the inner wall of the housing 12 at a position orthogonal to the bracket 35. The bracket 43 has a feed for tilting the tilting arm 30. A screw mechanism is provided. This feed screw mechanism has the same structure as the above-mentioned feed screw mechanism for tilting the tilting arm 29. When the level adjusting motor 45 is driven, the tilting screw 46 in the vertical direction rotates and the adjusting nut 47 moves. It is moved up and down, and the tilting arm 30 is tilted by the roller 49 at the tip. The adjusting nut 47 is guided in the vertical direction by a linear guide mechanism 50 including a protrusion 50a protruding rearward and a linear guide groove 50b fixed to the inner wall of the housing 12.

At the bottom of the bracket 35, the hollow member 20
A protrusion 51 is provided on the lower part of the projection 51 for locking the other end of the tension spring 52, one end of which is hooked. This protrusion 51 is
The tilting arms 29 and 30 orthogonal to each other are provided so as to bisect the angle. Therefore, the hollow member 20 is urged to move its lower portion toward the projection 51 in a state where the bulging portion 21 is supported by the sliding hole 19a, so that the parallel pins 31 and 32 of the tilting arms 29 and 30 move. Operating pins 42, 4
9 will be elastically contacted from below. Therefore, when the level adjusting motors 33 and 45, which constitute leveling driving means, are driven based on the signal from the microcomputer 53,
The operating pins 42 and 49 are respectively moved up and down to move the hollow member 2
0, that is, the rotary projection unit 15 is tilted in all directions around the rotation axis a to adjust the tilt angle with respect to the vertical direction.

Below the hollow member 20, the tilting arm 2 is provided.
Bracket 5 projecting in the opposite direction to 9, 30
5, 56 are provided. These brackets 55,
Level detection sensors 57 and 59 are attached to 56, respectively. These level detection sensors 57, 59
Detects the horizontality of the reference plane formed by the laser beam L ₃ projected from the rotary light projecting unit 15, that is, the tilt angle of the rotary light projecting unit 15 with respect to the vertical direction, and outputs the detection signal to the microcomputer 5
Send to 3.

A bracket 60 is provided on the upper portion of the hollow member 20 so as to project outward.
The rotation motor 61 is fixed to the. This motor 6
An endless belt 63 is wound around the outer periphery of the pulley 62 attached to the rotating shaft of No. 1 and the rotary light projecting unit 15. Therefore, when the rotation motor 61 is rotationally driven based on the signal from the microcomputer 53, the rotary light projecting portion 15 is rotated relative to the hollow member 20 via the pulley 62 and the endless belt 63.

Next, the control system of the laser surveying device 11 according to the present invention will be described with reference to FIG. The microcomputer 53 has input ports connected to the level detection sensors 57 and 59 and a ROM (storage means) 65, and output ports connected to the rotation motor 61, the laser diode drive circuit 67, and the level adjustment motors 33 and 45. ing. The laser diode 23 is connected to the laser diode drive circuit 67.

When the main power source is turned on when the power switch 10 is turned on, the microcomputer 53, regardless of the tilt position of the rotary light projecting portion 15, has level adjusting motors 33 and 45 constituting leveling driving means. It has a function as a leveling control means for outputting a driving signal to start the leveling operation. The microcomputer 53 also outputs a drive signal to the rotation motor 61 to rotationally drive the rotary light projecting unit 15. Further, after the leveling operation by the level adjusting motors 33 and 45 is once completed, the microcomputer 53 further determines that the tilt angle of the rotary light projecting unit 15 detected by the level detecting sensors 57 and 59 is a horizontal accuracy allowable value (normally ± 1).
0 ″), that is, when it is located between a tilt angle range for fine adjustment and a tilt angle range for intermediate adjustment, which will be described later, leveling control for outputting drive signals to the level adjusting motors 33 and 45. It has a function as a means.

When the tilt angle detected by the level detection sensors 57 and 59 exceeds the first threshold value after the leveling operation is started by driving the level adjustment motors 33 and 45, the microcomputer 53 further drives the laser diode drive circuit. A switching signal is output to 67 to cause the laser diode 23 to intermittently emit a laser beam, and then, when the second threshold value is exceeded, the switching signal is output to the laser diode drive circuit 67 again,
It has a function as a light emission operation switching means for switching the intermittent light emission to the continuous light emission. When the level adjusting motors 33 and 45 are driven again to perform the leveling operation by the fine adjustment after the leveling operation is completed, the microcomputer 53 also intermittently interrupts the laser light flux of the laser diode 23 that has continuously emitted light until then. It has a function as a light emission operation switching means for switching to the light emission and further returning the intermittent light emission to the continuous light emission when the re-leveling of the rotary light projecting unit 15 is completed.

The ROM 65 has a level adjusting motor 33,
When the rotary light projecting unit 15 is leveled by 45, the first threshold value and the second threshold value whose numerical values are stepwise changed to detect the current state of this leveling operation are stored as data. Has been done. The first threshold value is set when the first leveling operation, which is started based on a command from the microcomputer 53 when the main power is turned on, shifts from rough coarse adjustment to slightly fine intermediate adjustment, that is, coarse adjustment ends. This is data for detecting that the action has been taken. The second threshold value is data for detecting when the leveling operation shifts from the intermediate adjustment to the finest fine adjustment, that is, the completion of the intermediate adjustment.

On the other hand, reference numeral 70 in FIG.
The laser receiver is used in combination with the laser surveying device 11 when receiving a laser beam L ₃ projected from the laser beam and performing height measurement or the like. The laser receiver 70 has a size such that a setting operator can hold it with one hand, and when properly moved in the vertical direction in the state shown in the figure, the identification sound is changed depending on the light receiving state of the laser beam L ₃ . Therefore, the setting operator holding the laser receiver 70 can recognize the light receiving position of the projected laser beam L ₃ by the change in the identification sound.

The laser receiver 70 comprises the front wall 7 of the receiver body.
At the center of the upper part of 0a, there is a vertically long light receiving window 71 in which a protective glass is fitted. Inside the protective glass of the light receiving window 71, a light receiving element for receiving the laser beam L ₃ projected from the rotary light projecting unit 15 of the laser surveying device 11 is provided. Further, a display window 72 is provided on the right side of the light receiving window 71 in the front wall 70a, and on the left side, an on / off button 73 for sequentially switching the power on and off, and a switching button for setting the reference position display range from the top. 75, buzzer 76 and lighting 77
Is provided. The buzzer 76 emits a laser beam L ₃
Is emitted continuously and intermittently, different identification sounds are emitted depending on the height of the laser beam L ₃ received by the light receiving window 71 ((c), (d) and FIG. 4 in FIG. 4). (See (c) and (d) of 5).

Next, the operation of the laser surveying instrument 11 having the above construction will be described with reference to the flow charts of FIGS.

First, as shown in FIG. 8, the laser surveying device 11 is used.
Is set at a desired position via the tripod 69. As described above, when the laser surveying device 11 is set at a desired position, no adjustment is performed, and generally the rotation axis a of the rotary light projecting unit 15 does not coincide with the vertical direction. When the main switch is turned on and the main power is turned on in this state, the microcomputer 53
Outputs a drive signal to the level adjusting motors 33 and 45 to start the leveling operation (step S1). In this leveling work, when the level adjusting motors 33 and 45 are appropriately rotated and driven based on the drive signal from the microcomputer 82, the operating pins 42 and 49 which are respectively elevated and lowered by the feed screw mechanism appropriately tilt the tilting arms 29 and 30. By doing so, the hollow member 20, that is, the rotary light projecting portion 15 is tilted about the rotation axis a in an appropriate direction.

During this leveling operation, the microcomputer 53 (S
2), output from level detection sensors 57 and 59 and ROM
The first threshold value stored in 65 is constantly monitored (S3). Then, the microcomputer 53 uses the level detection sensor 5
When it is determined that the output from 7, 59, that is, the tilt angle of the rotary light projecting unit 15 with respect to the vertical direction exceeds the first threshold value, the leveling operation changes from rough coarse adjustment to slightly fine intermediate adjustment. In order to notify that, a drive signal is output to the laser diode drive circuit 67 to cause the laser diode 23 to intermittently emit (blink) through the circuit 67, and at the same time, a drive signal is output to the rotation motor 61 to rotate and project. The light unit 15 is rotationally driven (S4). The microcomputer 53 further continues the leveling operation with the intermittent light emission (S5).

When the microcomputer 53 determines that the tilt angle of the rotary light projecting portion 15 with respect to the vertical direction exceeds the second threshold value (S6), the leveling operation starts from the intermediate adjustment to the finest fine adjustment. In order to notify that, the switching signal is output to the laser diode drive circuit 67 to switch the intermittent operation of the laser diode 23 to continuous light emission through the circuit 67 (S7). The microcomputer 53 further continues the leveling operation in the state of continuous light emission (S8). Then, when the outputs from the level detection sensors 57 and 59 become substantially 0 (S9), the microcomputer 53 rotates the rotation axis a of the rotary light projecting unit 15.
Is determined to be substantially coincident with the vertical direction, a stop signal is output to stop the rotational drive of the level adjusting motors 33 and 45, and the leveling operation of the rotary light projecting unit 15 is stopped (S10).

In this leveling completed state, the microcomputer 53
Constantly monitors the tilt of the rotary light projecting unit 15 due to vibration or shock, that is, constantly monitors whether or not the tilt angle of the rotary light projecting unit 15 with respect to the vertical direction exceeds a second threshold value (S11). ), While the tilt angle of the rotary light projecting unit 15 exceeds the second threshold value, the leveling sensor 5 is caused to continue the leveling operation by fine adjustment while continuously emitting light (S12).
The leveling operation is stopped when the outputs from 7, 59 become substantially 0 (S13), and the laser diode 23 is made to continuously emit light even after the leveling is completed (S14).

On the other hand, in step S11, the rotary light projecting portion 15 is slightly tilted due to vibration or shock, and the tilt angle of the rotation axis a is closer to the first threshold value side than the second threshold value (intermediate adjustment). Area 53), the microcomputer 53 outputs a switching signal to the laser diode drive circuit 67 to switch the laser beam continuously emitting light to intermittent light emission and continue the leveling operation (S15). The setting worker holding the laser receiver 70 and performing the measurement work is the laser surveying device 1
By visually observing the laser light flux L ₃ projected intermittently while being at a position away from 1, the rotary light projecting unit 15
It can be recognized that the angle is not so large and that the leveling operation by the intermediate adjustment is being performed.

When the outputs from the level detecting sensors 57 and 59 are substantially zero, the microcomputer 53 determines that the rotation axis a of the rotary light projecting section 15 is substantially aligned in the vertical direction, and the rotary light projecting section is arranged. 15 leveling operation is stopped (S16, S1
3) Further, after the leveling is completed, the laser diode 23 continuously emits light (S14).

On the other hand, in step S16, when the output from the level detection sensors 57 and 59 does not become substantially 0, the process proceeds to S17, and it is checked whether or not the inclination angle of the rotation axis a exceeds the first threshold value. To do. As a result, when the tilt angle does not exceed the first threshold value, the microcomputer 5
3 to rotation motor 62, laser diode drive circuit 6
A stop signal is output to the 7 and the level adjusting motors 33 and 45 to stop the rotation projection function and the leveling function, and at the same time, a warning is displayed by continuously lighting the warning display LED 9 (S18).

In the above continuous light emission, the laser beam L ₃ rotatively projected is received by the laser receiver 70 side and receives a signal of one pulse each time the rotary light projecting unit 15 makes one rotation. Therefore, as shown in (a) of FIG. 4, the light receiving signal becomes intermittent at relatively short predetermined time intervals. At this time, display based on the continuous signal shown by the solid line in FIG. Then, when the received laser beam L ₃ is applied to the reference position of the laser receiver 70, the buzzer sound (identification sound) emitted by the buzzer 76 becomes a continuous sound shown by the solid line in (c) of FIG. . Further, when the received laser beam L ₃ is applied to a position deviated from the reference position of the laser receiver 70, the buzzer sound becomes an intermittent sound shown in (d) of the figure.
Therefore, the setting operator can identify the content displayed on the display unit 72 and the sound emitted by the buzzer 76 to determine the laser receiver 7
The measurement work is performed while raising and lowering 0 as appropriate.

In the intermittent light emission, the laser light beam L ₃ rotatively projected is received by the laser light receiver 70 side and receives a signal of one pulse every two rotations of the rotary light projecting unit 15. Therefore, as shown in FIG. 5A, a relatively long predetermined time interval (twice as long as continuous light emission (FIG. 4A))
Is an intermittent light receiving signal. At this time, display based on the intermittent signal shown by the solid line in FIG. When the received laser beam L ₃ is applied to the reference position of the laser receiver 70, the buzzer sound emitted by the buzzer 76 is (c) in FIG.
The intermittent sound is indicated by the solid line. Further, when the received laser beam L ₃ is applied to the position deviated from the reference position of the laser receiver 70, the buzzer sound is generated in (d) of FIG. 4 as shown in (d) of FIG. Intermittent sound is obtained by intermittently interposing every four pulses of the intermittent signal shown for a predetermined time. Therefore, the setting operator is required to display the contents of the display 72 and the buzzer 76.
By identifying the sound emitted by the laser surveying device 11
Can be recognized that it is in the leveling operation.

In the above embodiment, the first and second threshold values are stored in the ROM 65 as fixed data.
The present invention is not limited to this. That is, by inputting the first and second threshold values as variable data into a RAM (not shown) and adjusting the scale, the range of the tilt angle that requires leveling can be changed. can do.

[0038]

As described above, according to the present invention, it is possible to provide a laser surveying apparatus capable of notifying a setting worker that a releveling operation is being performed instead of a failure of the apparatus.

According to the present invention as set forth in claim 2, it becomes possible for the setting operator to recognize the current situation from the time when the main power is turned on until the leveling operation is once ended.

[Brief description of drawings]

FIG. 1 is a block diagram showing a control system in an embodiment according to the present invention.

FIG. 2 is a flowchart showing the operation of the laser surveying instrument by the control system.

FIG. 3 is a flowchart showing the operation of the laser surveying instrument by the control system.

FIG. 4 is a timing chart showing detection display on the laser receiver side during continuous emission of laser light flux.

FIG. 5 is a timing chart showing detection display on the laser receiver side when the laser light flux is intermittently emitted.

FIG. 6 is a sectional view showing the entire laser surveying instrument according to the present invention.

FIG. 7 is a plan view showing an enlarged main part of the laser surveying instrument.

FIG. 8 is a perspective external view showing a state of using the laser surveying instrument and the laser receiver.

[Explanation of symbols]

11 Laser Surveying Device 15 Rotating Light Emitting Unit (Light Emitting Unit) 23 Laser Diode (Laser Light Source) 33 45 Level Adjusting Motor (Leveling Driving Means) 53 Microcomputer (Leveling Controlling Means, Emission Operation Switching Means) 57 59 Level Detection Sensor (detection sensor) 61 Rotation motor 65 ROM (storage means) a Rotation axis

Claims (3)

[Claims] 1. A laser projector comprising: a light projecting unit rotatable about a rotation axis which should be arranged in a substantially vertical direction; and a laser light source for giving a laser beam to the light projecting unit, and rotating the light projecting unit. In a laser surveying device that forms a reference plane substantially parallel to a horizontal plane by rotationally projecting a laser beam from a light source in a direction substantially orthogonal to a rotation axis, a detection sensor for detecting an inclination angle of the light projecting portion with respect to a vertical direction; Leveling drive means for tilting the light projecting portion so that its rotation axis extends in a substantially vertical direction; after the leveling operation by the leveling drive means is once completed, the tilt angle detected by the detection sensor has an allowable value. Leveling control means for outputting a drive signal to the leveling drive means to re-level when exceeding the level; and continuous light emission when the leveling drive means starts driving based on the drive signal from the leveling control means. The laser light flux of the laser light source It switched connection emission, when the re-leveling of the light projecting portion is completed, the light emitting operation switching means for returning the tomographic secondary light continuously emitted; laser surveying apparatus comprising the. 2. A laser projecting unit, which is rotatable about a rotation axis which should be arranged in a substantially vertical direction, and a laser light source which gives a laser beam to the projecting unit. The laser is provided by rotating the projecting unit. In a laser surveying device that forms a reference plane substantially parallel to a horizontal plane by rotationally projecting a laser beam from a light source in a direction substantially orthogonal to a rotation axis, a detection sensor for detecting an inclination angle of the light projecting portion with respect to a vertical direction; Leveling drive means for tilting the light projecting portion so that its rotation axis extends substantially vertically; when the main power source is turned on,
Leveling control means for outputting a drive signal to the leveling drive means;
After the leveling operation by the leveling driving means is started, when the tilt angle detected by the detection sensor exceeds the first threshold value, the laser light beam from the laser light source is intermittently emitted and exceeds the second threshold value. And a light emission operation switching means for switching the intermittent light emission to continuous light emission. 3. The first threshold value according to claim 2, wherein the first threshold value is stored in the storage means as data for detecting a transition from a rough coarse adjustment at the time of leveling to a slightly fine intermediate adjustment. The threshold value of the laser surveying device is stored in the storage means as data for detecting the transition from the intermediate adjustment to the finest fine adjustment.