Abstract:
The invention provides a surveying instrument, comprising a surveying instrument main body and a remote control operation unit being attachable to and detachable from the surveying instrument main body and capable of communicating with the surveying instrument main body. The remote control operation unit has an operation button, a directional angle sensor and a vertical sensor. The angle measurement value is transmitted to the remote control operation unit by pressing the operation button. The remote control operation unit calculates a difference between the directional angle and the vertical angle detected by the directional angle sensor and the vertical sensor before moving and the directional angle and the vertical angle after moving the remote control operation unit. An angle measurement value after moving is calculated based on the difference and the main body control unit rotates the telescope unit so as to become the angle measurement value after the moving.

Description:
BACKGROUND OF THE INVENTION 
     The present invention relates to a surveying instrument, by which it is possible to facilitate sighting to a target to be measured. 
     Conventionally, in a case where surveying operation is performed by a surveying instrument, which does not use a reflector such as a reflection prism and the like, a sighting of a point to be measured has been performed by a telescope. 
     A sighting using a telescope is usually performed by several methods. For instance, the following methods and the like have been known: a method to control a driving unit by an interface, such as a button or a slider on a screen of a remote control operation unit, or a method where a camera image as acquired by the surveying instrument main body is displayed on a remote control operation unit and a point to be sighted is specified on the image. 
     However, in a case where sighting is performed by means of a button or a slider on the screen, an operator cannot perform sighting by sensory operation because the sighting will be controlling on an interface on the screen. Further, in a case where a point to be sighted is selected from a screen, there are restrictions on a visual field or on a display resolving power of a camera. Further, in a case where it is difficult to recognize a monitor screen such as a case where illuminance is not sufficient in a measurement environment or a dynamic range is wide or the like because illuminance of a background is high, the working efficiency decreased. 
     SUMMARY OF THE INVENTION 
     It is an object of the present invention to provide a surveying instrument, by which the guiding to a measuring point can be easily performed and working efficiency can be improved. 
     To attain the object as described above, a surveying instrument according to the present invention comprises a surveying instrument main body and a remote control operation unit being attachable to and detachable from the surveying instrument main body and capable of communicating with the surveying instrument main body, wherein the surveying instrument, main body has a telescope unit for sighting a measuring point, a laser pointer irradiating unit for irradiating a laser pointer beam running in parallel to or on the same axis as an optical axis of the telescope unit, a rotation driving unit for rotating the telescope, unit in any direction as desired, an angle detector for detecting an angle measuring value, and a main body control unit for controlling the rotation driving unit to direct the telescope unit in a predetermined direction, wherein the remote control operation unit has an operation button, a directional angle sensor and a vertical sensor, the angle measurement value is transmitted to the remote control operation unit by pressing the operation button under the condition where the remote control operation unit is removed, wherein the remote control operation unit calculates a difference between the directional angle and the vertical angle detected by the directional angle sensor and the vertical sensor before moving and the directional angle and the vertical angle after the moving of the remote control operation unit, wherein either one of the remote control operation unit and the main body control unit calculates an angle measurement value after the moving based on the difference and the main body control unit rotates the telescope unit so as to become the angle measurement value after the moving. 
     Further, in the surveying instrument according to the present invention, the remote control operation unit calculates a difference between the directional angle, the vertical angle before the moving and the directional angle, the vertical angle after the moving at all times under a condition where the operation button is pressed and transmits a rotation instruction to the main body control unit at all times. 
     Further, in the surveying instrument according to the present invention, the remote control operation unit detects a directional angle and a vertical angle at the moment when the operation button is released, calculates a difference between the directional angle, the vertical angle at the moment when the operation button is pressed and the directional angle, the vertical angle at the moment when the operation button is released, and transmits a rotation instruction to the main body control unit. 
     Further, the surveying instrument according to the present invention further comprises an electro-optical distance meter, wherein an optical axis of the electro-optical distance meter is on the same axis or runs in parallel to the laser pointer beam. 
     Furthermore, in the surveying instrument according to the present invention, the remote control operation unit corrects a difference between the directional angle and the vertical angle before the moving and the directional angle and the vertical angle after the moving based on a predetermined sensitivity. 
     According to the present invention, the surveying instrument comprises a surveying instrument main body and a remote control operation unit being attachable to and detachable from the surveying instrument main body and capable of communicating with the surveying instrument main body, wherein the surveying instrument main body has a telescope unit for sighting a measuring point, a laser pointer irradiating unit for irradiating a laser pointer beam running in parallel to or on the same axis as an optical axis of the telescope unit, a rotation driving unit for rotating the telescope unit in any direction as desired, an angle detector for detecting an angle measuring value, and a main body control unit for controlling the rotation driving unit to direct the telescope unit in a predetermined direction, wherein the remote control operation unit has an operation button, a directional angle sensor and a vertical sensor, the angle measurement value is transmitted to the remote control operation unit by pressing the operation button under the condition where the remote control operation unit is removed, wherein the remote control operation unit calculates a difference between the directional angle and the vertical angle detected by the directional angle sensor and the vertical sensor before moving and the directional angle and the vertical angle after the moving of the remote control operation unit, wherein either one of the remote control operation unit and the main body control unit calculates an angle measurement value after the moving based on the difference and the main body control unit rotates the telescope unit so as to become the angle measurement value after the moving. As a result, it is possible to easily guide at a position distant from the surveying instrument main body, the sighting direction of the telescope unit to a measuring point while visually confirming an irradiating position of the laser pointer beam, and this contributes to the improvement of the working efficiency. 
     Further, according to the present invention, in the surveying instrument, the remote control operation unit calculates a difference between the directional angle, the vertical angle before the moving and the directional angle, the vertical angle after the moving at all times under a condition where the operation button is pressed and transmits a rotation instruction to the main body control unit at all times. As a result, it is possible to make the movement of the surveying instrument main body to follow the movement of the remote control operation unit, and this makes it possible to guide the laser pointer beam to the measuring point in easier manner. 
     Further, according to the present invention, in the surveying instrument, the remote control operation unit detects a directional angle and a vertical angle at the moment when the operation button is released, calculates a difference between the directional angle, the vertical angle at the moment when the operation button is pressed and the directional angle, the vertical angle at the moment when the operation button is released, and transmits a rotation instruction to the main body control unit. As a result, there is no need to calculate the difference by detecting a directional angle and a vertical angle after the moving at all times, and this makes it possible to reduce the load of processing in the remote control operation unit. 
     Further, according to the present invention, the surveying instrument, further comprises an electro-optical distance meter, wherein an optical axis of the electro-optical distance meter is on the same axis or runs in parallel to the laser pointer beam. As a result, when a distance measurement of the measuring point is to be carried out, it is simply necessary to guide the laser pointer beam to the measuring point, and this contributes to the improvement of the working efficiency when distance measurement is performed. 
     Furthermore, according to the present invention, in the surveying instrument, the remote control operation unit corrects a difference between the directional angle and the vertical angle before the moving and the directional angle and the vertical angle after the moving based on a predetermined sensitivity. As a result, it is possible to carry out precise guiding of the laser pointer beam, and the laser pointer beam can be guided in easy and accurate manner. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a schematical front view of a surveying instrument according to an embodiment of the present invention. 
         FIG. 2  is a schematical side view of the surveying instrument according to an embodiment of the present invention. 
         FIG. 3  is a schematical drawing of a remote control operation unit used by the surveying instrument. 
         FIG. 4  is a block diagram of a main body control unit of the surveying instrument. 
         FIG. 5  is a block diagram of a remote control operation unit of the surveying instrument. 
         FIG. 6  is an explanatory drawing to explain a remote control operation by the remote control operation unit. 
         FIG. 7  is a flowchart to explain a measurement of a measuring point according to a first embodiment of the present invention. 
         FIG. 8  is an explanatory drawing to explain the remote control operation by the remote control operation unit. 
         FIG. 9  is a flowchart to explain a measurement of a measuring point according to a second embodiment of the present invention. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Description will be given below on embodiments of the present invention by referring to the attached drawings. 
     First, referring to  FIG. 1  to  FIG. 3 , a description will be given on a surveying instrument according to a first embodiment of the present invention. 
     A surveying instrument  1  has a tripod  2 , and a leveling unit  3  is provided on an upper end of the tripod  2 . On the leveling unit  3 , a rotation base  5  is rotatably mounted via a horizontal rotation shaft  4 , and the leveling unit  3  has a leveling mechanism (not shown) to perform leveling in a vertical direction and a tilt sensor  6  (to be described later). Inside the leveling unit  3 , a horizontal rotation driving unit  7  is incorporated so that the rotation base  5  is rotated around the horizontal rotation shaft  4  as the center by the horizontal rotation driving unit  7 . 
     A frame case  8  is installed in a vertical direction on the rotation base  5 , and a telescope unit  11  is rotatably mounted on the frame case  8  via a vertical rotation shaft  9 , which has a horizontal axis. 
     The telescope unit  11  has a sighting telescope  12 . The sighting telescope  12  has a visual field angle of about 5° and sights a measuring point. A sighting point of the sighting telescope  12  is shown by a reticule (not shown) provided on the sighting telescope  12 . 
     A vertical rotation driving unit  13  is incorporated in the frame case  8 , and the telescope unit  11  is rotated in the vertical direction around the vertical rotation shaft  9  as the center by the vertical rotation driving unit  13 . 
     The horizontal rotation driving unit  7  and the vertical rotation driving unit  13  make up together a rotation driving unit. By a cooperative operation of the horizontal rotation driving unit  7  and the vertical rotation driving unit  13 , the rotation driving unit can direct the telescope unit  11  in a direction as desired. 
     On an upper surface of the telescope unit  11 , an electro-optical distance meter (EDM)  14  is provided, and a laser pointer irradiating unit  15  is incorporated in the electro-optical distance meter  14 . The electro-optical distance meter  14  can perform non-prism distance measurement, and the laser pointer irradiating unit  15  is designed to irradiate a laser beam (a laser pointer beam)  16  of a visual light. An optical axis of the laser pointer beam  16  coincides with distance measuring optical axis of the electro-optical distance meter  14 . 
     Further, the telescope unit  11  is integrated with the electro-optical distance meter  14 . The optical axis of the electro-optical distance meter  14 , i.e. the optical axis of the laser pointer beam  16  runs in parallel to the optical axis of the telescope unit  11 , and a distance between the optical axes of the laser pointer beam.  16  and the telescope unit  11  is already known. It is to be noted that it may be so arranged that the optical axis of the telescope unit  11  is in the same axis as the optical axis of the laser pointer beam  16 , and that the optical axis of the telescope unit  11  and the optical axis of the laser pointer beam  16  run in parallel to a distance measuring optical axis of the electro-optical distance meter  14 . Also, the electro-optical distance meter  14  may be provided on the telescope unit  11  via an attachment (not shown), or the direction of the optical axis of the electro-optical distance meter  14  may be adjustable by the attachment. In this case, the electro-optical distance meter  14  as commercially available may be used. 
     A horizontal angle detector  17  is provided on the horizontal rotation shaft  4 , and it is so arranged that the horizontal angle detector  17  can detect a rotation angle of the horizontal rotation shaft  4 , i.e. a horizontal rotation angle of the rotation base  5 . Also, a vertical angle detector  18  is provided on the vertical rotation shaft  9  and the vertical angle detector  18  can detect a rotation angle of the vertical rotation shaft  9 , i.e. a vertical rotation angle of the telescope unit  11 . 
     Further, inside the rotation base  5 , a main body control unit  19  is provided. It is to be noted that if there is room for the main body control unit, the main body control unit  19  may be provided at other site such as the telescope unit  11  and the like. The main body control unit  19  may be designed to control the horizontal rotation driving unit  7  and the vertical rotation driving unit  13 , and to control distance measurement by the electro-optical distance meter  14 , to control the laser pointer irradiating unit  15 , to measure a horizontal angle and a vertical angle based on detection results of the horizontal angle detector  17  and the vertical angle detector  18 , and to perform data communication to and from a remote control operation unit  21  as to be described later. It is to be noted that excepting the remote control operation unit  21 , the leveling unit  3 , the rotation base  5 , the frame case  8 , the telescope unit  11 , etc make up together a surveying instrument main body. 
     It is so arranged that the remote control operation unit  21  can be attached to or removed from the leveling unit  3  via an attachment  22  (see  FIG. 2 ). 
     As shown in  FIG. 3 , the remote control operation unit  21  is designed as a portable type (hand-held type) for example a smart phone or a tablet and the like, where the remote control operation unit  21  can be operated by one hand in a state where the other hand has the remote control operation unit  21 . The remote control operation unit  21  has a display unit  23  and an operation unit (the display unit  23  works as a touch panel and also serves as an operation unit), and a communication unit (to be described later) and the like to perform data communication to and from the main body control unit  19 . Also, the remote control operation unit  21  is provided with a vertical sensor  24  and a directional angle sensor  25  to detect posture and direction of the remote control operation unit  21 . 
     As shown in  FIG. 2 , it may be arranged in such manner that a deflecting optical unit  26  is provided on the telescope unit  11  and the optical axis of the telescope unit  11  may be deflected by the deflecting optical unit  26  so that a part of the light of the electro-optical distance meter  14  is sent back to the telescope unit  11  and so that a sighting point of the telescope unit  11 , the measuring point of the electro-optical distance meter  14  and irradiating point of the laser pointer irradiating unit  15  coincide with each other. 
     Since the telescope unit  11  is rotated in the horizontal direction and in the vertical direction by an operation from the remote control operation unit  21 , the operation enables the surveying instrument  1  to perform operations as required such as an operation to determine sighting direction, an operation to determine measuring points, or an operation to perform measurement and the like. Under the condition that the remote control operation unit  21  is installed on the surveying instrument  1 , the surveying instrument  1  is in a condition that the telescope unit  11  is directly operated via the remote control operation unit  21 . Under the condition that the remote control operation unit  21  is detached, the surveying instrument  1  is in a condition that the telescope unit  11  is remotely controlled via the remote control operation unit  21 . 
     Under a condition that an engageable and disengageable type connector (not shown) is provided on each of the remote control operation unit  21  and the attachment  22 , and the remote control operation unit  21  is installed on the attachment  22 , it may be so arranged that the remote control operation unit  21  is directly and electrically connected to the main body control unit  19  via connecting of a connector. 
     Referring to  FIG. 4  and  FIG. 5 , further description will be given on the main body control unit  19  and the remote control operation unit  21 . 
     First, referring to  FIG. 4 , description will be given on the main body control unit  19 . 
     The main body control unit  19  primarily comprises a first arithmetic control unit  27 , a first storage unit  28 , the horizontal angle detector  17 , the vertical angle detector  18 , the tilt sensor  6 , an operation unit  29 , a first communication unit  31 , the electro-optical distance meter  14 , the horizontal rotation driving unit  7 , the vertical rotation driving unit  13 , the display unit  23 , a first power supply unit  32 , etc. 
     Detection signals from the horizontal angle detector  17 , the vertical angle detector  18 , and the tilt sensor  6  are inputted to the first arithmetic control unit  27 . At the first communication unit  31 , a communication is controlled by the first arithmetic control unit  27 , and a control command is issued from the first communication unit  31 , and the data received by the first communication unit  31  is inputted to the first arithmetic control unit  27 . 
     The first arithmetic control unit  27  controls the electro-optical distance meter  14 , and the result of a measurement at the electro-optical distance meter  14  is inputted to the first arithmetic control unit  27 . The first arithmetic control unit  27  controls the horizontal rotation driving unit  7  and the vertical rotation driving unit  13 , and makes the telescope unit  11  and the electro optical distance meter  14  to rotate in a direction as required. 
     The detection result from the horizontal angle detector  17  and the vertical angle detector  18  are inputted to the first arithmetic control unit  27 . Based on the detection results of the horizontal angle detector  17  and the vertical angle detector  18 , the rotation angle in the horizontal direction and the rotation angle in the vertical direction of the deflecting optical unit  26 , the electro-optical distance meter  14  and the laser pointer irradiating unit  15  are measured. 
     The detection result of the tilt sensor  6  is inputted to the first arithmetic control unit  27 , and a leveling operation of the leveling unit  3  is controlled, and based on the detection results of the tilt sensor  6  and the vertical angle detector  18 , the vertical angle of the telescope unit  11  is measured. 
     An operation unit and a display unit as provided on the remote control operation unit  21 , as to be described later, double as the display unit  23  and the operation unit  29 . 
     In the first storage unit  28 , various types of programs are stored. These programs include: a control program necessary for controlling the electro-optical distance meter  14 , the first communication unit  31 , the horizontal rotation driving unit  7  and the vertical rotation driving unit  13 , an angle measuring program for specifying a tilt angle, a horizontal rotation angle, a vertical rotation angle, etc. based on the detection results from the horizontal angle detector  17 , the vertical angle detector  18  and the tilt sensor  6 , and a communication control program for controlling the communication by the first communication unit  31 , etc. Further, measurement data and the like such as the distance measurement results, the angle measurement results, etc. by the electro-optical distance meter  14  are stored in the first storage unit  28 . 
     The first power supply unit  32  is a chargeable battery such as a lithium-ion battery and the like, and the first power supply unit  32  supplies electric power as necessary to the first arithmetic control unit  27 , the first communication unit  31 , the horizontal rotation driving unit  7 , the vertical rotation driving unit  13 , and the like. 
     Referring to  FIG. 5 , description will be given below on the remote control operation unit  21 . 
     The remote control operation unit  21  primarily comprises the display unit  23 , the operation unit  29 , a second arithmetic control unit  33 , a second storage unit  34 , the vertical sensor  24 , the directional angle sensor  25 , a second communication unit  35 , a second power supply unit  36 , and the like. 
     Detection signals from the vertical sensor  24  and the directional angle sensor  25  are inputted to the second arithmetic control unit  33 , and the second arithmetic control unit  33  calculates posture of the remote control operation unit  21  based on the signals from the vertical sensor  24  and the directional angle sensor  25 . 
     The second communication unit  35  receives the data transmitted from the main body control unit  19  and inputs the data to the second arithmetic control unit  33 . Further, the second communication unit  35  transmits information of a posture and the like of the remote control operation unit  21  as calculated at the second arithmetic control unit  33  and the like to the main body control unit  19 . 
     It is so arranged that the data transmitted from the main body control unit  19 , for instance, or information and the like as calculated by the second arithmetic control unit  33  or the like are displayed on the display unit  23 . 
     Further, the display unit  23  is designed to perform any operation as desired by using the display unit  23  as touch panel, or the functions of the operation unit  29  may be concentrated in the display unit  23 . The display unit  23  has an operation button  30  for remotely controlling the telescope unit  11  and for performing to guide the laser pointer beam  16 . 
     In the second storage unit  34 , various types of programs and the like are stored. These programs include: a communication control program for controlling communication by the second communication unit  35 , a program to make the display unit  23  to display and to fulfill functions of the display unit  23  as an operation unit, a program for calculating an information relating to the posture of the remote control operation unit  21 , such as a direction and a tilting, etc. of the remote control operation unit  21  based on the signals from the vertical sensor  24  and the directional angle sensor  25 , a program for calculating the moving amount of the telescope unit  11  based on the information and other programs. Also, in the second storage unit  34 , data of distance measurement and angle measurement as determined by the surveying instrument  1  are stored. 
     The second power supply unit  36  is a chargeable battery such as lithium-ion battery and the like, and electric power as necessary is supplied to the second arithmetic control unit  33 , the second communication unit  35 , the display unit  23 , etc. 
     When the operation button  30  of the display unit  23  is pressed, i.e. at the moment when the operation button  30  is pressed by the vertical sensor  24 , a vertical angle θ of the designated direction  37  of the remote control operation unit  21  before moving, is detected. Also, at the moment when the operation button  30  is pressed by the directional angle sensor  25 , directional angle φ of the designated direction  37  of the remote control operation unit  21  before the moving is detected. 
     Also, when the operation button  30  is pressed, a push-down signal is transmitted to the surveying instrument  1  via the second communication unit  35  and the push-down signal is received via the first communication unit  31 . A horizontal angle H of the telescope unit  11  is detected by the horizontal angle detector  17  at the moment when the operation button  30  is pressed, a vertical angle V of the telescope unit  11  is detected by the vertical angle detector  18  at the moment when the operation button  30  is pressed. That is, an angle measurement value (H, V) of the telescope unit  11  is measured, and the result is transmitted to the remote control operation unit  21 . 
     It is to be noted that after the operation button  30  is pressed, that is, after the moving, a directional angle and a vertical angle (φ′, θ′) of the remote control operation unit  21  are detected at all times as long as the operation button  30  is pressed. The second arithmetic control unit  33  calculates a difference (φ′−φ, θ′−θ) at all times between a directional angle and a vertical angle (φ′, θ′) as detected after the moving and a directional angle and a vertical angle (φ, θ) as detected before the moving. 
     Based on the sensitivity as determined in advance or the sensitivity as set up by the operator, the second arithmetic control unit  33  corrects the calculated difference (φ′−φ, θ′−θ) to the angle displacement amount (ΔH, ΔV) of the telescope unit  11 , and a rotation instruction is transmitted to the main body control unit  19  at all times so that an angle measurement value of the telescope unit  11  will be (H+ΔH, V+ΔV). 
     Based on the rotation instruction from the remote control operation  21 , the main body control unit  19  drives the horizontal rotation driving unit  7  and the vertical rotation driving unit  13 . 
     It is so arranged that the above processing is continuously carried out until the operation button  30  is released. That is, when the remote operation control unit  21  is moved while the operator presses the operation button  30 , the telescope unit  11  is rotated in the horizontal direction and in the vertical direction by following the movement of the remote control operation unit  21 . Therefore, as shown in  FIG. 6 , the operator is able to guide the laser pointer beam  16  to the measuring point  38  at a position separated from the telescope unit  11 . 
     Next, by referring to the flowchart shown in  FIG. 7 , a description will be given below on a case where the telescope unit  11  is remotely operated by the remote control operation unit  21  and the measurement is performed by guiding the laser pointer beam  16  to the measuring point  38 . It is to be noted that in the description as given below, an explanation is given on a case where the display unit  23  is used as the operation unit  29 . 
     (Step 01) First, when an instruction for irradiating the laser pointer beam  16  is inputted from the display unit  23  of the remote control operation unit  21 , the instruction for irradiating is inputted to the main body control unit  19 . The laser pointer irradiating unit  15  is driven and the laser pointer beam  16  is irradiated. 
     At this moment, angle measurement values (H, V) of the telescope unit  11  are detected and updated at all times based on the detection results by the tilt sensor  6 , the horizontal angle detector  17  and the vertical angle detector  18 . 
     (Step 02) Irradiating by the laser pointer beam  16  is started, next by pressing the operation button  30  of the display unit  23 , the guiding process of the laser pointer beam  16  is started. 
     (Step 03) When the operation button  30  is pressed, angle measurement values (H, V) of the telescope unit  11 , at the moment when the operation button  30  is pressed, are transmitted to the remote control operation unit  21 . Also, based on the detection results of the vertical sensor  24  and the directional angle sensor  25 , the directional angle and the vertical angle (φ, θ) of the designated direction  37  of the remote control operation unit  21  are detected at the moment when the operation button  30  is pressed. 
     (Step 04) Under the condition where the operation button  30  has been pressed, the designated direction  37  of the remote control operation unit  21  is moved to the measuring direction. 
     (Step 05) Under the condition where the operation button  30  is pressed, by moving the remote control operation unit  21 , the directional angle and the vertical angle (φ′, θ′) after moving are detected at all times. 
     (Step 06) When the directional angle and the vertical angle (φ′, θ′) after the moving have been detected, the second arithmetic control unit  33  calculates a difference (φ′−φ, θ′−θ) between the directional angle, the vertical angle (φ, θ) before the moving and the directional angle, the vertical angle (φ′, θ′) after the moving. 
     (Step 07) The second arithmetic control unit  33  corrects the calculated difference (φ′−φ, θ′−θ) to an angle displacement amount (ΔH, ΔV) of the telescope unit  11  based on the predetermined sensitivity, and the rotation instruction is transmitted at all times to the main body control unit  19  so that the angle measurement value of the telescope unit  11  will be (H+ΔH, V+ΔV). 
     In this case, the sensitivity for correcting the difference (φ′−φ, θ′−θ) to the angle displacement amount (ΔH, ΔV) may be so arranged that the difference (φ′−φ, θ′−θ) and the angle displacement amount (ΔH, ΔV) will be equal to each other or that the difference (φ′−φ, θ′−θ) will be about 1/10 of the angle displacement amount (ΔH, ΔV). 
     (Step 08) The procedure of Step 04 to Step 07 as described above is continuously performed until the operation button  30  is released. That is, under the condition where the operation button  30  is pressed, the telescope unit  11  is by following the movement of the designated direction  37  of the remote control operation unit  21 . 
     (Step 09) After the operation button  30  is released, it is judged whether the irradiating position of the laser pointer beam  16  is coincident with the measuring point  38 . Is a case where the irradiating position of the laser pointer beam  16  is not coincident with the measuring point  38 , the procedure in Step 02 to Step 08 is carried out acain. 
     (Step 10) In a case where she irradiating position of the laser pointer beam  16  is coincident, with the measuring point  38 , by inputting an instruction for distance measurement, the guiding procedure of the laser pointer beam  16  is completed and a non-prism distance measurement to the measuring point  38  is performed by the electro-optical distance meter  14 . 
     (Step 11) When the non-prism distance measurement with respect to the measuring point  38  is completed, the angle measurement value at the moment of the non-prism distance measurement is displayed on the display unit  23  together with the distance measurement value. 
     (Step 12) Finally, when a turn-off instruction for the laser pointer beam  16  is inputted from the display unit  23 , the turn-off instruction is inputted to the main body control unit  19 , and the laser pointer beam  16  is turned off and the measurement of the measuring point  38  is completed. 
     As described above, in the first embodiment of the present invention, by pressing the operation button  30  of the display unit  23 , the directional angle and the vertical angle (φ, θ) of the remote control operation unit  21  at the present moment are detected. The difference (φ′−φ, θ′−θ), when the designated direction  37  of the remote control operation unit  21  is moved in an arbitrary direction, is corrected to the angle displacement amount (ΔH, ΔV) and is added to the angle measurement value (H, V) in real time. By driving the horizontal rotation driving unit  7  and the vertical rotation driving unit  13 , the moving of the telescope unit  11  is enabled to follow the movement of the remote control operation unit  21  continuously as long as the operation button  30  is pressed. 
     Therefore, by using the remote control operation unit  21 , the operator can guide the sighting direction of the telescope unit  11  to the measuring point  38  sensuously while visually confirming the irradiating position of the laser pointer beam  16 . As a result, even within she limited visual field of the sighting telescope  12  or a screen surface or the like, or in a case where it is difficult to recognize the measuring point  38  because illuminance is not sufficient or dynamic range is wide or the like because illuminance of the background is high, the laser pointer beam.  16  can be guided easily to the measuring point  38 , and it is possible to improve the working efficiency. 
     Because the optical axis of the laser pointer beam  16  coincides with the optical axis of the electro-optical distance meter  14  and it is possible to control the rotation of the telescope unit  11  from a separated position by the remote control operation unit  21 , the operator is capable of simply performing to guide the laser pointer beam  16  near the measuring point  38 . Therefore, even when the measuring point  38  and the position of the telescope unit  11  are distant from each other, the laser pointer beam  16  can be guided to the measuring point  38  in quick and reliable manner. 
     It would be sufficient that the operation button  30  of the display unit  23  is pressed and under this condition the designated direction  37  of the remote control operation unit  21  is moved. As a result, there is no need to have a special operation to guide the laser pointer beam  16 , and this makes it possible to reduce the burden on the operator. 
     Further, because the optical axis of the electro-optical distance meter  14  is on the same axis as the laser pointer beam  16 , in a case where a distance measurement is performed with respect to the measuring point  38 , it would be sufficient to guide the laser pointer beam  16  toward the measuring point  38 . This makes it possible to improve the working efficiency in the distance measurement. 
     In the first embodiment, the calculating difference (φ′−φ, θ′−θ) is corrected to the angle displacement amount (ΔH, ΔV) based on the sensitivity as set up in advance or on the sensitivity as inputted by the operator. However, it may be so arranged that non-prism distance measurement is performed by the electro-optical distance meter  14  in parallel to the detection of the directional angle and the vertical angle (φ′, θ′) after the moving and a sensitivity may be automatically adjusted based on the result of distance measurement. Because the sensitivity is adjusted automatically, the laser pointer beam  16  can be guided in easier manner. 
     Also, as shown in  FIG. 8 , by performing the angle measurement by the horizontal angle detector  17  and the vertical angle detector  18 , and by performing the distance measurement by the electro-optical distance meter  14 , while guiding the laser pointer beam  16 , a three-dimensional locus of a target to be measured  39  can be traced in non-contact manner. 
     In the first embodiment, the remote control operation unit  21  calculates the difference (φ′−φ, θ′−θ) and converts the difference (φ′−φ, θ′−θ) to the angle displacement amount (ΔH, ΔV), and transmits the rotation instruction to the main body control unit  19  so that the angle measurement value of the telescope unit  11  will be (H+ΔH, V+ΔV). However, it may also be arranged in such a manner that the remote control operation unit  21  transmits the difference (φ′−φ, θ′−θ) to the main body control unit  19 , and further the main body control unit  19  determines the angle displacement amount (ΔH, ΔV) and may rotate the telescope unit  11  so that the angle measurement value will be (H+ΔH, V+ΔV). 
     Next, by referring to the flowchart as shown in  FIG. 9 , description will be given on a processing of measurement according to a second embodiment wherein a laser pointer beam  16  is guided to a measuring point  38  and a measurement is performed. It is to be noted that the arrangement of the surveying instrument  1  in the second embodiment is the same as in the first embodiment, and the same component as shown in  FIG. 1  to  FIG. 3  is referred by the same symbol, and the detailed description is not given here. 
     (Step 21) First, when an instruction for irradiating the laser pointer beam  16  is inputted from a display unit  23  of a remote control operation unit  21 , the instruction for irradiating is inputted, to a main body control unit  19 . A laser pointer irradiating unit  15  is driven and the laser pointer beam  16  is irradiated. 
     (Step 22) Irradiating by the laser pointer beam  16  is started, next by pressing an operation button  30  of the display unit  23 , the guiding process of the laser pointer beam  16  is started. 
     (Step 23) When the operation button  30  is pressed, the angle measurement values (H, V) of the telescope unit  11 , at the moment when the operation button  30  is pressed, are transmitted to the remote control operation unit  21 . Also, based on the results of detection by a vertical sensor  24  and a directional angle sensor  25 , the directional angle and the vertical angle (φ, θ) of a designated direction  37  of the remote control operation unit  21  are detected at the moment when the operation button  30  is pressed. 
     (Step 24) Under the condition that the operation button  30  is pressed, the designated direction  37  of the remote control operation unit  21  is moved to the measuring direction. 
     (Step 25) When the designated direction  37  is shifted to the measuring direction, it is then judged as to whether the operation button  30  has been released or not. 
     (Step 26) When it is judged that the operation button has been released, the directional angle and the vertical angle (φ′, θ′) after the moving are detected by the vertical sensor  24  and the directional angle sensor  25 . 
     (Step 27) When the directional angle and the vertical, angle (φ′, θ′) after the moving (at the moment when the operation button has been released) are detected, the second arithmetic control unit  33  calculates the difference (φ′−φ, θ′−θ) between the directional angle and the vertical angle (φ, θ) before the moving and the directional angle and the vertical angle (φ′, θ′) after the moving. 
     (Step 28) Based on the predetermined sensitivity, the second arithmetic control unit  33  corrects the calculated difference (φ′−φ, θ′−θ) to the angle displacement amount (ΔH, ΔV) of the telescope unit  11  and a rotation instruction is transmitted to the main body control unit  19  so that the measured angle value of the telescope unit  11  will be (H+ΔH, V+ΔV). That is, the telescope unit  11  is rotated by an amount of the moving while the operation button  30  is pressed. 
     (Step 29) After the telescope unit is rotated it is judged as to whether or not the irradiating position of the laser pointer beam  16  is coincident with the measuring point  38 . In a case where the irradiating position of the laser pointer beam  16  is not coincident with the measuring point  38 , the procedure of the Steps 22 to 28 is carried out again. 
     (Step 30) In a case where the irradiating position of the laser pointer beam  16  is coincident with the measuring point  38 , by inputting an instruction for distance measurement, the guiding of the laser pointer beam  16  is completed and a non-prism distance measurement to the measuring point  38  is performed by the electro-optical distance meter  14 . 
     (Step 31) When the non-prism distance measurement with respect to the measuring point  38  is completed, the angle measurement value at the moment of the non-prism distance measurement is displayed on the display unit  23  together with the distance measurement value. 
     (Step 32) Finally, when the turn-off instruction for the laser pointer beam  16  is inputted from the display unit  23 , the turn-off instruction is inputted to the main body control unit  19 , and she laser pointer beam  16  is turned off and the measurement of the measuring point  38  is completed. 
     Also, in the second embodiment, by using the remote control operation unit  21 , the operator can guide the sighting direction of the telescope unit  11  to the measuring point  38  according to his sense while visually watching the irradating position of the laser pointer beam  16 . As a result, it is possible to guide the laser pointer beam  16  easily to the measuring point  38 , and this contributes to the improvement of the working efficiency. 
     Also, in the second embodiment, the directional angle and the vertical angle (φ′, θ′) can be detected only after the moment when the operation button  30  has been released, and the difference (φ′−φ, θ′−θ) can be calculated, and thereby there is no need to detect the directional angle and the vertical angle (φ′, θ′) at all times. This makes it possible so reduce the load of processing to be applied on the remote control operation unit  21 . 
     It is to be noted that in both of the first embodiment and the second embodiment, the electro-optical distance meter  14  is integrated with the laser pointer irradiating unit  15 , while only the laser pointer irradiating unit  15  may be used on the telescope unit  11 . In a case where the distance measurement is not needed while the angle measurement value is needed, only the laser pointer irradiating unit  15  may be provided on the telescope unit  11 . 
     Also, in the first embodiment and the second embodiment, a portable type terminal is used, such as a smart phone and the like, in which the operation unit  29  is integrated, with the display unit  23 , while it is needless to say that a general portable wireless terminal may be used where the display unit  23  and the operation unit  29  are provided separately.