JP2000337876A - Automatic tracking apparatus for position measuring and plotting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a position measuring and plotting apparatus by which a tracking operation in a wide range can be realized in a high-accuracy detection, and to quickly perform the tracking operation. SOLUTION: Together with a light receiving element 18 in an electronic distance meter 17 which receives tracking light in a standard range, a light receiving part 20, for wide-range tracking, wherein an objective optical system whose focal length is smaller than the focal length of an objective optical system in the electronic distance meter 17 and a light receiving element 35 are provided, is arranged. The light receiving element 35 is provided with four transversely long divided center elements A to D which track light in a first wide range. In addition, and right and left longitudinally long elements G1 to G6, R1 to R6, E, F which track light in a second wide range. Then, a microcomputer 41 grasps the driving angle of a tracking operation on the basis of respective receiving positions of the right and left elements G1 to G6, R1 to R6, and it controls a measuring head part so as to be turned at a high speed when the driving angle is larger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic tracking device for use in a position measurement plotting device for preparing a site sketch or the like in the case of a traffic accident, and for automatically directing a measurement head portion to a measurement point indicating portion. Regarding the configuration.

[0002]

2. Description of the Related Art In a traffic accident processing business or the like, a position measurement plotting device is used to quickly and accurately perform measurement between related points at an accident site and create a sketch, and a measuring unit in such a position measurement plotting device. An automatic tracking device is used for positioning. Conventionally, a position measurement plotting apparatus to which an automatic tracking device is applied has a configuration shown in FIG. 12, for example.

[0003] In FIG. 12, a position measurement plotting apparatus includes a measuring device 1 mounted on an accident handling vehicle or the like and a measuring point indicating section (target) 2 set at a measuring point such as a road. On the side, a measurement head unit 1A that rotates in the elevating direction and the turning direction is attached to the in-vehicle mount 1B, and a TV camera 3 and an optical distance meter 4
Is arranged. This lightwave distance meter 4 has a light receiving unit 5,
A measuring beam such as a laser beam is emitted, the distance is measured by the reflected beam, and the light for tracking incident via the objective optical system 4A is detected by the light receiving section 5.

On the other hand, the measuring point indicating unit 2 arranged as a target of a measuring point such as a road includes a corner cube reflecting mirror 9 provided at a predetermined height of an indicating rod 8 and an outer peripheral portion of the reflecting mirror 9. And a plurality of light emitting units (such as LEDs) 10 for outputting light for tracking.

According to such an apparatus, the measuring point indicating unit 2
Is placed at the measuring point such that the reflecting mirror 9 faces the measuring head 1A, the tracking light S1 output from the light emitting unit 10 is received by the light receiving unit 5 on the measuring head 1A side. Accordingly, the rotation of the measuring head unit 1A is controlled so as to face the front of the reflecting mirror. After the positioning of the measurement head unit 1A is performed, the lightwave distance meter 4 is used.
Emits the measuring light S2 and receives the reflected light from the reflecting mirror to measure the distance to the measuring point indicating unit 2.

The distance data, together with the elevation angle and the turning angle information of the measuring head unit 1A, are input to a drawing calculation computer (not shown), and the computer calculates three-dimensional coordinate data. The drawing processing is performed based on the data, and the drawing data can be output by a plotter or the like, whereby a site sketch can be obtained.

[0007]

However, in the automatic tracking device for the position measurement plotting device, as described above,
Since the tracking light S1 is guided to the same light receiving portion by using the objective optical system 4A of the lightwave distance meter 4, there is an advantage that the tracking can be executed with high accuracy, but there is a problem that the tracking range is narrow. is there. That is, the objective optical system 4A uses a lens system having a relatively long focal length f in view of the relationship with the distance measurement, and the detection area for tracking becomes narrow. Therefore, if an obstacle passes between the measuring head unit 1A and the measuring point indicating unit 2 during the automatic tracking, the tracking operation may not be performed. In this case, the measurer may watch the image on the TV monitor. While manually giving a command, the measuring head unit 1A must be moved to enter the detectable area.

Therefore, conventionally, Japanese Patent Application Laid-Open No. 10-1972
As disclosed in Japanese Patent Application Publication No. 47-47, in order to enable tracking in a wide range, a light receiving section including an objective optical system having a short focal length and a horizontally long light receiving element is provided. FIG. 13 shows the configuration of the light receiving element 11 of the light receiving section. In this light receiving element 11, the horizontal length (width) of the four divided light receiving areas (elements) A0 to D0 is increased. Yes, the horizontal range in which light can be received, that is, the tracking range can be widened.

However, automatic tracking over a range wider than the range detected by the light receiving element 11 is required, and if this tracking range can be further expanded, manual operation is reduced and convenience is improved. A position measurement plotter can be obtained. On the other hand, it is possible to further increase the lateral width of the light receiving areas A0 to D0 in the light receiving element 11 of FIG. 13, but there is a limit to the expansion of the lateral width, which causes a problem that the detection accuracy of tracking light is reduced. is there.

[0010] Further, in a position measurement plotting apparatus used for a traffic accident processing business or the like, short-time work is required.
Even in automatic tracking, a quick tracking operation is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to realize a further wide-range tracking under high-accuracy detection, and to obtain a user-friendly position measurement plotting apparatus. Another object of the present invention is to provide an automatic tracking device for position measurement drawing that can quickly perform a tracking operation.

[0012]

In order to achieve the above object, the present invention provides a tracking light emitting section for outputting tracking light from a measuring point indicating section, and a measuring head section having a front face having the measuring point indicating section. A driving unit that rotates to face the unit, a center element that is provided to receive tracking light from the tracking light-emitting unit, and that is divided at the center and that is disposed on both left and right (horizontal) sides of the center element. Controlling the driving unit based on the output of the wide-area tracking light-receiving element composed of left and right elements arranged in a multi-divided manner so as to have a vertically long (long in the vertical direction) light-receiving area; A control circuit for rotating the measuring head at a higher speed when the driving angle until the front of the head faces the measuring point indicating unit is larger than when the driving angle is small. In addition, it is possible to add and arrange the upper and lower elements in the vertical direction of the central element.

According to the above configuration, the tracking light can be captured not only in the range captured by the center element but also in a wide range on the left and right by the left and right elements. On the other hand, the drive angle at which the front of the measurement head unit faces can be grasped. Then, in addition to the signal of the direction to be driven, the control circuit outputs a speed control signal corresponding to the magnitude of the angle to the drive unit, whereby the drive unit controls the measurement head unit at a higher speed as the angle is larger. Drive. Therefore, even when the front of the measurement head unit is separated from the direction of the measurement point indicating unit, it can be quickly driven to a position facing the measurement point indicating unit.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 show a configuration of an automatic tracking device for position measurement drawing according to an example of an embodiment.
FIG. 4 shows a position measurement plotting apparatus. First, the overall configuration of the position measurement plotting apparatus will be described. In FIG.
On the side of the measuring machine 12 mounted on an accident handling vehicle or the like, a measuring head unit 13 is supported by an in-vehicle gantry 14, and the gantry 14 maintains the measuring head unit 13 in a horizontal state. The mount 14 has a drive unit 1 having a rotation mechanism.
5 is arranged, and the measurement head unit 1 is
3 is driven to rotate in the elevating direction and the turning direction, and the elevating angle and the turning angle are output from the head unit 13 as drawing data.

In the measuring head section 13, there are provided a TV camera 16 for photographing the periphery of the measuring point, an optical distance meter 17 having an objective optical system 17A and a light receiving element 18, and a light receiving section 20 for wide range tracking. This wide-range tracking light receiving unit 20
Consisting of a central element that receives a first wide area light wider than the standard range of the standard tracking light receiving unit (light receiving element 18) and left and right elements that receive a second wide area light on both left and right (horizontal) sides of the central element. Is done. The lightwave distance meter 17 emits measurement light via an objective optical system 17A, receives reflected light of the measurement light, and can measure a distance. By catching the light by the light receiving element 18, a reflecting mirror section described later is automatically tracked.

Further, a control unit 21 is provided in the measuring machine 12.
And a power supply unit 22 for supplying operating power to each unit is arranged,
The control unit 21 includes a TV monitor 23, an automatic tracking circuit 24, a drawing calculation unit (computer) 25, and an operation unit 26. The drawing calculation unit 25 calculates a position of each measurement point on three-dimensional coordinates based on data such as a distance obtained by the measurement head unit 13 and obtains a distance between each measurement point. Performs arithmetic processing for Operation unit 2
6 is provided with operation switches for measurement and plotting,
A drawing mode and data for drawing can also be input.

On the other hand, a measuring point indicating section (target) 28 is provided at a measuring point remote from the measuring device 12, and the measuring point indicating section 28 is provided on the reflecting rod 3 in the middle of the indicating rod 29.
0 is arranged. The reflecting mirror unit 30 includes a corner cube reflecting mirror 31 and a plurality of light emitting units 32 arranged on the outer peripheral portion. The light emitting unit 32 generates tracking light for an automatic tracking function of the measuring head unit 13. Emit. The light emitting section 32 can also output a signal for operation control at the same time. For example, the tracking light is pulsed light corresponding to bit information, and the bit information is used as control information.

FIGS. 1 and 2 show a configuration relating to a tracking function. First, in the above-described optical distance meter 17, as shown in FIG. 2, an objective optical system 17A is provided with a lens (or lens group) having a focal length f1. ), And the light receiving element 18 has a
It is composed of elements divided into four regions d (substantially square). The light receiving element 18 and the objective optical system 17A function as a light receiving unit for distance measurement and also function as a standard tracking light receiving unit.

A wide-range tracking light receiving unit 20 is disposed near the lightwave distance meter 17, and the wide-range tracking light receiving unit 20 has a focal length f2 smaller than the focal length f1 (f2 <f1). Objective (lens) system 34 having
And a light receiving element 3 for receiving light of a first wide area and a second wide area
5 is comprised. That is, the objective optical system 34 has a shorter focal length than the standard tracking objective optical system 17A,
It is possible to capture a wide field of view.

Further, the light receiving element 35 is composed of four divided elements (light receiving areas) A to D as central elements, and vertically long elements (light receiving areas) G 1 to G 6 as left and right elements.
, R1 to R6, horizontally long (long in the horizontal direction) elements (light receiving areas) E and F are arranged as upper and lower elements, and the central elements A to D are arranged such that the light receiving area (light receiving surface) is Even if the focal length f of the objective optical system is the same, a wide range can be detected. The light receiving surfaces of the upper and lower elements E and F are center elements A to
The light receiving surfaces of the left and right elements G and R have the same vertical width as the height of the arrangement of the central elements A to D and the upper and lower elements E and F. The number of these light receiving areas G, R, E, F is arbitrary.

According to the configuration of such a light receiving section, for example, as shown in FIG. 7, when described in the left-right (horizontal) direction, the lightwave distance meter 17 including the light receiving elements (a to d) 18 (for standard tracking) The light receiving section) receives tracking light in the range of the angle α. In the wide-range tracking light receiving section 20, the central elements A to D have a range of the angle β, the left and right elements G1 to G6,
R1 to R6 receive the tracking light in the range outside the angle β in the range of the angle γ, and can receive the tracking light in the wide range of γ as a whole. Here, the angles have a relationship of α <β <γ.

In FIG. 1, the above-mentioned light receiving elements 18, 35
Is connected to the automatic tracking circuit 24 described with reference to FIG.
B, filter circuits 38A, 38B, 38C, synchronous detectors 39A, 39B, 39C, A / D converters 40A, 40
B, 40C and a microcomputer 41 are provided. That is, the filters 38A, 38B, 38C and the detectors 39A, 3A
9B and 39C, the light emitting unit 3 of the measurement point indicating unit 28 is used.
The light-emitting pulse signal output from the light-receiving element 1 is extracted.
8, the light amounts of the respective elements a to d.
The light amounts of the respective elements F, G1 to G6 and R1 to R6 are detected.

The microcomputer 41 calculates a tracking signal for automatic tracking control based on the detected light amounts of the four-divided light receiving element 18 and the multi-divided light receiving element 35, and rotates the measuring head unit 13 in the up and down (up) direction. A vertical tracking signal to be moved and a horizontal tracking signal to be rotated left and right (turning) are output to the measurement head unit 13.

Further, according to the multi-segment light receiving element 35 and the microcomputer 41, as shown in FIG. 3, the angle until the front of the measuring head section (light receiving element 35) 13 faces the measurement point indicating section 28 is determined. can do. That is, in FIG.
The principal ray for each image point is shown. When the tracking light is detected by the central elements A to D and the upper and lower elements E and F, the angle 0 to 0
Although it is in the range of θ ₀ , for example, when it is detected by the left and right elements R 1 to R 6, the angle to the left θ 1 to θ 6, that is, θ 1 for R 1, θ 2 for R 2, θ 3 for R 3, θ 4 for R 4, θ 4 for R 3, In the case of R5, .theta.5 is grasped, and in the case of R6, .theta.6 is grasped. Conversely, when it is detected by the right and left elements G1 to G6, the right angles .theta.1 to .theta.6 can be specified.

FIG. 5 shows the speed control of the rotation mechanism of the measuring head unit 13. The microcomputer 41 operates the measuring head unit 13 at a higher speed as the angle θ to be driven is larger.
Is controlled to rotate. FIG.
.. D to the elements G1 to G6 (the same applies to the elements R1 to R6). For example, when the tracking light (light receiving position P) is detected by the element G6 or G5, the angular velocity V1
Are output until reaching the boundary position of the area of the central elements A to D. Similarly, a control signal of the angular velocity V3 is output when detected by the element G4 or G3, and a control signal of the angular velocity V5 is output when detected by the element G2 or G1. When the tracking light is detected by the central elements A to D, the angular velocity V7 Output a control signal.

The control range of the rotating mechanism is set by the limiters at both ends. For example, when the tracking light P is at a position outside the detection range as shown in FIG.
When the limiter position is reached by moving to the left as shown in the figure, the motor is driven in reverse to rotate at, for example, an angular velocity V1.

The embodiment has the above configuration, and its operation will be described below. FIG. 7 shows the tracking operation of the measuring head unit 13. FIGS.
1 shows the tracking processing control executed in step S1. First, in creating a floor plan, the tip of the pointing rod 29 of the measuring point indicating unit 28 in FIG. 4 is placed at the measuring point, and the reflecting mirror unit 30 is directed to the measuring head unit 13. At this time, the tracking light (S1) is emitted from the light emitting unit 32 of the reflecting mirror unit 30, and the tracking light is transmitted to the standard tracking light receiving unit (17) of the measurement head unit 13.
A, 18) and the light is received by the wide-area tracking light receiving unit 20, and the tracking processing shown in FIG. 8 is performed.

In FIG. 8, in step 101, it is detected whether or not the light amounts Sa, Sb, Sc, and Sd detected by the elements a to d of the standard tracking light receiving element 18 are larger than the threshold value J. , Any light amount is larger than the J value [Y
(YES)], the process proceeds to the standard range tracking control of FIG. 102 (FIG. 9). In addition, [N (N
O)] In step 103, whether the light amounts SA, SB, SC, and SD detected by the central elements A to D of the light receiving elements 35 for tracking the first wide area are larger than the threshold value j. If it is determined whether or not any light amount is larger than the j value (Y), the process shifts to the first wide-range tracking control of step 104 (FIG. 10).

Further, if the value j is smaller than the value j (N) in step 103, the second step is executed in step 105.
G1 to G6, R of the light receiving element 35 for tracking a wide range
It is detected whether or not the light amounts SG1 to SG6, SR1 to SR6, SE, SF detected by the left and right elements 1 to R6 and the upper and lower elements of E and F are larger than a threshold value i. When it is larger than the value (Y), the process shifts to the second wide-range tracking control (FIG. 11) in step 106. On the other hand, if any of the light amounts is smaller than the i value [N], it means that the distance is long or the optical path is blocked, and the non-detection processing of step 107 is performed.

FIG. 9 shows the operation of the standard range tracking control, and FIG.
0 shows the operation of the first wide-range tracking control, and FIG. 11 shows the operation of the second wide-range tracking control.
The following description is based on the assumption that tracking is performed from the state (A) to the state (C). In the state of FIG. 7A, the second wide-range tracking control of FIG. 11 is executed in the tracking processing of FIG.

In FIG. 11, in step 401,
It is determined whether (SG5-SR5) or (SG6-SR6) is greater than or equal to K4 (K4: constant). When Y, that is, when tracking light is detected from the left direction, the angular velocity in the left direction is determined. V
1 is output (step 402), and
At 03, it is determined whether (SG3-SR3) or (SG4-SR4) is equal to or greater than K4. If Y, a tracking signal of the angular velocity V3 is output leftward (step 404), and step 405 is performed. Then, it is determined whether (SG1-SR1) or (SG2-SR2) is equal to or greater than K4. If Y, a tracking signal of the angular velocity V5 is output in the left direction (step 40).
6). If the determination in step 405 is N, the tracking signal in the predetermined direction is not output (step 40).
7).

In the next step 408, the same operation as in the above steps 401 to 407 is performed in order to track rightward. That is, in step 408, (SGn-SRn) [n =
1-6] is smaller than -K4, and-
When it is less than K4, the tracking light is detected from the right direction, so that the signals of the angular velocities V1, V3, V5 are output in the right direction according to the light receiving position (angle). Then, based on the control signal, the driving unit 15 rotates the measuring head unit 13 so as to face the measuring point indicating unit 28, but as shown in FIG.
Is detected by the element G6 or G5 (θ4 <θ ≦ θ6
), Is rotationally driven at the speed V1 to the position of the angle θ0, and similarly when detected by the element G4 or G3 (θ2 <θ ≦
θ4), and is driven to rotate at the speed V3, and when it is detected by the element G2 or G1 (θ0 <θ ≦ θ2), it is driven to rotate at the speed V5. Therefore, the farther the measuring head unit 13 is, the faster the moving is in the direction of the tracking light.

Next, at step 409, (SE-SF
)> K3 (K3: constant) is determined, and when Y, that is, when tracking light is detected from below, a tracking signal is output in the downward direction (step 410).
At step 412, it is determined whether or not (SE-SF) <-K3 is satisfied. When Y is determined, that is, when tracking light is detected from above, an upward tracking signal is output (step 413). ). Then, each of the above determination steps 409,
If N in 412, the tracking signal in the predetermined direction is not output (steps 411 and 414), and based on the tracking signal by such an operation, the measurement head unit 13 performs the operation shown in FIG.
The drive is performed from the range of the angle γ in FIG. 7A to the range of the angle β in FIG. 7C, and thereafter, the first wide-range tracking control in FIG. 10 is performed.

In FIG. 10, in step 301 (S
It is determined whether or not A + SB)-(SC + SD)> K1 (K1: constant) is satisfied. When Y is determined, that is, when tracking light is detected from below, a tracking signal in the downward direction is output. (Step 302), and in step 304, (SA + SB)
A determination is made as to whether or not satisfies-(SC + SD) <-K1. When Y is determined, that is, when tracking light is detected from above, an upward tracking signal is output (step 30).
5) In step 307, (SA + SD)-(SB + S
C)> K2 (K2: constant) is determined, and when Y, that is, when tracking light is detected from the left, a tracking signal in the left direction is output (step 308).
In step 310, (SA + SD)-(SB + SC) <
It is determined whether or not -K2 is satisfied. When Y is determined, that is, when tracking light is detected from the right, a tracking signal in the right direction is output (step 311).

Each of the determination steps 301, 304, 3
If the answer is N in 07 and 310, no tracking signal is output (steps 303, 306, 309 and 312), and the measurement head unit 13 of FIG.
Is driven from the range of the angle β to the range of the angle α in FIG. 6C, and thereafter, the standard range tracking control in FIG. 9 is performed.

In FIG. 9, the standard range tracking control operation is basically the same as the operation in FIG. 10 described above except for the difference between the constants k1 and k2. That is, in step 201, it is determined whether (Sa + Sb)-(Sc + Sd)> k1 is satisfied. If Y, a downward tracking signal is output (step 202), and in step 204, (Sa + S)
b) The determination of-(Sc + Sd) <-k1 is made, and if Y, an upward tracking signal is output (step 205).
In step 207, (Sa + Sd)-(Sb + Sc)>
The determination of k2 is performed, and if Y, a tracking signal in the left direction is output (step 208), and in step 210, (Sa
+ Sd)-(Sb + Sc) <-k2, and Y
, A rightward tracking signal is output (step 21).
1).

Each of the judgment steps 201, 204, 2
When the answer is N in 07 and 210, no tracking signal is output (steps 203, 206, 209 and 212), and the standard range tracking control performs the above-described measurement head as shown in FIG. The unit 13 faces the front of the reflecting mirror unit 30 of the measurement point indicating unit 28.

Thereafter, in the lightwave distance meter 17, as shown in FIG. 4, the measuring light is emitted and the reflected light (S 2) reflected from the corner cube reflecting mirror 31 is received to measure the distance. The distance measurement value is output to the drawing calculation unit 25 together with the current elevation angle and turning angle of the measurement head unit 13 moved during the automatic tracking. And
By outputting the drawing data from the drawing calculation unit 25 to the plotter, the site sketch is printed.

FIG. 6 shows another example of the speed control based on the detected angle. The control of FIG. 6A is performed by each of the left and right elements (light receiving areas) G6 to G1. Angular velocities V1 to V6 for rotating to θ0 are set. When the tracking light is detected by the element G6, the velocity is V1, similarly, G5 is V2, G4 is V3, and G3 is V3.
4. A control signal of V5 is output at G2, and a control signal of V6 is output at G1. Note that the speed once set at each detection position is maintained until tracking light is detected by the central elements A to D, as in the case of FIG. 5, and the speed V7 is set in the central element region.

In the control of FIG. 6B, the speed is set for each of the elements G6 to G1 in which the tracking light is detected. The speed is V1 when the tracking light is detected, and V2 when the tracking light is G5.
, G4, V3, G3, V4, G2, V5
, G1 the control signal of V6 is output. FIG.
The control of (C) and (D) is for setting the speed changing in a predetermined pattern. In FIG. 6 (C), the pattern Pa1, G4, or the pattern Pa2 when detected by the element G6 or G5. , G2 or G1, the control signal of the pattern Pa1 is output. In FIG. 6D, the pattern Pb1 when detected by the element G6, the pattern Pb2 when G5, the pattern Pb3 when G4, the pattern Pb4 when G3, the pattern Pb5 when G2, and the pattern Pb when G1.
The control signal of b6 is output.

Even with these various controls, the higher the angle, the higher the speed of the rotational drive, and the direction of the measurement head unit 13 is farther away from the direction of the measurement point indicating unit 28. Even so, it is possible to quickly make the front of the measuring head unit 13 face the measuring point indicating unit 28. It should be noted that the speed control in the above embodiment is performed by controlling G1
To G6, but the other R1 to R6 of the left and right elements
The same applies to 6.

[0042]

As described above, according to the present invention,
A wide-range tracking light receiving element having a central element and left and right elements that are multi-divided and arranged to have vertically long light receiving areas on both the left and right sides of the central element is provided. Based on this, when the drive angle is large, the drive control is performed so that the measurement head rotates at a higher speed than when it is small, so that a further wide range tracking is realized under high-precision detection. The device can be obtained, and the tracking operation can be performed quickly.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an automatic tracking device for position measurement drawing according to an embodiment of the present invention.

2A and 2B show the configuration of a light receiving unit of the automatic tracking device of FIG. 1, wherein FIG. 2A is a diagram of a standard range tracking light receiving unit and FIG. 2B is a diagram of a wide range tracking light receiving unit;

FIG. 3 is a diagram illustrating angle information with respect to tracking light obtained by a wide-range tracking light receiving unit of the embodiment.

FIG. 4 is a block diagram illustrating an overall configuration of a position measurement plotting apparatus according to the embodiment.

FIG. 5 is a graph showing a driving angular velocity of a measuring head unit set in accordance with light receiving positions of left and right light receiving elements of the embodiment.

FIG. 6 is a graph showing another example of the angular velocity control in the measurement head unit.

FIG. 7 is a diagram illustrating a tracking operation of the measurement head unit in FIG. 4;

FIG. 8 is a flowchart showing a tracking process in the microcomputer of FIG. 1;

FIG. 9 is a flowchart showing a standard range tracking control operation in the tracking processing of FIG. 8;

FIG. 10 is a flowchart showing a first wide-range tracking control operation in the tracking processing of FIG. 8;

FIG. 11 is a flowchart illustrating a second wide-range tracking control operation in the tracking processing of FIG. 8;

FIG. 12 is a diagram showing a configuration of a conventional position measurement drawing device.

FIG. 13 is a diagram showing a configuration of a conventional light receiving element.

[Explanation of symbols]

1B, 14: on-vehicle mount, 1A, 13: measuring head unit, 2, 28: measuring point indicating unit, 12: measuring machine, 15: driving unit, 17: lightwave distance meter (including light receiving element for tracking), 17A, Reference numeral 34: Objective optical system, 18, 35: Light receiving element, 20: Light receiving unit for wide-range tracking, 24: Automatic tracking circuit, 30: Reflecting mirror unit, 32: Light emitting unit, 41: Microcomputer, A to D: Central element, G1 ~ G6, R1 ~ R6
... left and right elements, E, F ... upper and lower elements.

Continued on the front page (72) Inventor Masami Yoneda 1-3324 Uetake-cho, Omiya-shi, Saitama F-term in Fuji Photo Optical Co., Ltd. (reference) 2C032 HA01 2F065 AA02 AA22 DD06 FF04 FF28 FF65 GG04 GG13 JJ01 JJ03 JJ16 JJ24 JJ26 LL12 LL17 QQ03 QQ33

Claims (1)

[Claims] A tracking light-emitting unit that outputs light for tracking from a measurement point indicating unit; a driving unit that rotationally drives a measurement head unit so that the front thereof faces the measurement point instruction unit; A wide-range tracking device that is provided to receive tracking light from the unit and includes a central element divided and arranged at the center and left and right elements that are multi-divided and arranged so as to have vertically long light receiving areas on both left and right sides of the central element. A light-receiving element, and controlling the driving unit based on the output of the light-receiving element for wide-area tracking. When the driving angle until the front of the measurement head unit faces the measurement point indicating unit is large, the driving speed is higher than when the driving angle is small. An automatic tracking device for position measurement drawing, comprising: a control circuit for rotating the measurement head unit.