JP3482010B2 - Scanning light detection sensor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanning light detecting sensor which is used in combination with a laser surveying instrument which forms a reference plane by scanning laser light and detects the position of this scanning laser light projected on a wall surface. .

[0002]

2. Description of the Related Art Generally, in the field of civil engineering and construction, a laser surveying instrument (so-called laser planer) is used which forms a reference plane by scanning a laser beam from a rotating light projecting portion toward a wall surface around the apparatus body. By measuring the height of the spot of the laser light that has reached the wall surface, reference is made and height is measured.

A scanning light detecting sensor is used to detect the scanning position on the wall surface of the laser light projected from such a laser surveying instrument. As this scanning light detection sensor, for example, there is a sensor that photoelectrically detects the arrival position of the laser light to be scanned. As such a scanning light detection sensor, a device having a function of detecting a laser beam scanned by a laser surveying instrument by a pair of upper and lower light receiving elements provided in the main body and detecting a position of the main body with respect to the scanning laser light is provided. It is known (see Japanese Patent Publication No. 6-13992).

This scanning light detecting sensor detects a position in the vertical direction with respect to a reference plane formed by laser light scanned in a substantially horizontal plane, and a measuring person uses a level (to prevent the scanning light detecting sensor from tilting). While watching the bubble tube, move the scanning light detection sensor to the position where the center of the light receiving element and the center of the scanning laser light match, and based on the position of the scanning light detection sensor at the time of matching, the center position of the laser light To detect and set.

By the way, although the conventional scanning light detecting sensor can detect the coincidence between the center of the light receiving element and the center of the scanning laser light, the operation at the time of the detection requires the scanning light detecting sensor. It requires a great deal of skill to move while holding the vertical. Furthermore, when the reference plane by the scanning laser light is tilted with respect to the horizontal plane to set the gradient reference plane, even if the scanning light detection sensor is held vertically, since the laser light that is scanned and projected has an inclination, There was a problem that accurate marking could not be performed.

[0006]

SUMMARY OF THE INVENTION The present invention is based on the above problems of the conventional scanning light detecting sensor, and can easily perform the work of detecting the scanning laser light without requiring any skill, and the reference surface of the scanning laser light can be used. It is an object of the present invention to provide a scanning light detection sensor which can easily detect the center of laser light even when there is a gradient in the area and can perform marking accurately.

[0007]

SUMMARY OF THE INVENTION The present invention for achieving the above object is used in combination with a laser surveying instrument for forming a reference plane by a scanning laser beam, and detects the position of this scanning laser beam projected on a wall surface. In the scanning light detection sensor, a reference point and a pair of light receiving portions arranged at rotationally symmetric positions around the reference point, each of the pair of light receiving portions is a scheduled scan of the scanning laser light passing through the reference point. A pair of light receiving elements that are long in a direction orthogonal to the direction and are provided at positions opposite to each other across the planned scanning direction,
A pair of light receiving elements, an adder circuit that adds the output values of the light receiving elements that are provided in the same direction with respect to the planned scanning direction, an output difference detection circuit that detects the output difference of the addition circuit, and an output from the output difference detection circuit. It is characterized in that it comprises an informing means for informing predetermined information in accordance with the above, and a mark means for marking the scanning laser beam position, which is provided at the reference point. It is preferable to include a plurality of sets of corresponding one set of light receiving elements which are provided at positions opposite to each other so as to sandwich them.

Further , the present invention provides a scanning light detecting sensor for detecting the position of the scanning laser light projected on a wall surface, which is used in combination with a laser surveying instrument for forming a reference plane by the scanning laser light. Point, a pair of light receiving portions arranged at rotationally symmetric positions around this reference point, an output difference detection circuit for detecting an output difference between the pair of light receiving portions, and an output difference between the pair of light receiving portions is allowed. The pair of light receiving portions are each provided with an informing means for informing that the value is within the value and a mark means for marking the scanning laser beam position provided at the reference point, and each of the pair of light receiving portions is scheduled for the scanning laser beam passing through the reference point. It is characterized in that it is composed of one light receiving element which is provided at positions opposite to each other across the planned scanning direction in a direction orthogonal to the scanning direction.

Furthermore, the present invention is used in combination with the laser survey instrument for forming a reference plane by scanning the laser beam, the scanning light detecting sensor for detecting the position of the scanning laser beam projected on the wall, the reference Point, a pair of light receiving portions arranged at rotationally symmetric positions around this reference point, a peak position detecting circuit for detecting a bit at the peak position of the output of the pair of light receiving portions, and a peak position detecting circuit An adder circuit for adding the outputs, an informing unit for informing the predetermined information based on the result of the determination based on the result of the determination, which determines the relationship between the scanning laser beam and the reference point by the calculated bits added by the adding circuit. And a mark means for marking the position of the scanning laser light, and each of the pair of light receiving portions is arranged in a direction orthogonal to the planned scanning direction of the scanning laser light passing through the reference point. There is characterized by comprising a line sensor such as a CCD.

[0010] mark means, the body of the scanning light detecting sensor, is preferably provided with a reference hole provided by penetrating in the thickness direction of the body.

The reference hole is preferably a conical hole whose diameter gradually decreases toward the wall surface when the main body of the scanning light detection sensor is in contact with the wall surface.

[0012] reference hole, in a state where the main body of the scanning light detecting sensor is brought into contact with the wall surface, it is preferable to mark points mechanism is provided to mark the wall to move toward the wall surface.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to illustrated embodiments. First, before describing the scanning light detection sensor according to the present invention, a laser surveying instrument that forms a reference plane by the scanning laser light to be detected by the scanning light detection sensor will be described with reference to FIG.
7 and FIG.

This laser surveying instrument 11 is installed via a tripod 12 at a reference position which is a reference for surveying, and rotates a rotatable rotary light projecting portion 13 at the upper part around a vertical axis as an axis. A laser beam L projected from the unit 13 is scanned around the surveying instrument body to form a reference plane in the horizontal plane or in a plane having a predetermined gradient with respect to the horizontal plane.
Reference symbol La in FIG. 18 indicates the locus of the spot of the scanning laser light L projected on the wall surface 14.

A scanning light detecting sensor 15 for receiving the laser light L projected from the laser surveying instrument 11 having such a structure.
Is located at an appropriate position on the wall surface 14 which stands upright along the substantially vertical direction, and moves along the wall surface 14 to detect the height of the center of the laser beam L in the width direction from the reference plane G. To be done. Then, the setting operator appropriately sets the center in the width direction of the laser light L on the wall surface 14, whereby the reference plane or the gradient plane can be set.

FIG. 1 is a perspective external view showing a first embodiment of a scanning light detecting sensor according to the present invention. The scanning light detection sensor 15 has a pair of light receiving portions 16 and 17 arranged on a front wall 15a on the front side at rotationally symmetrical positions about a reference point. The pair of light receiving portions 16 and 17 are configured to be long in a direction orthogonal to the planned scanning direction of the scanning laser light L. The light receiving portion 16 is provided in substantially the same plane as the front wall 15a, and is provided in a pair of first and second light receiving elements provided in directions opposite to each other with respect to the planned scanning direction of the scanning laser light L passing through the reference point. It consists of 16a and 16b. Further, the light receiving portion 17 is provided in substantially the same plane as the front wall 15a, and is provided in a pair of first and second light receiving elements provided in directions opposite to each other with respect to the planned scanning direction of the scanning laser light L passing through the reference point. 17
It consists of a and 17b.

Between the first and second light receiving elements 16a and 16b, there is provided a boundary portion 16c along the planned scanning direction of the scanning laser light L passing through the reference point to be detected, and the first and second light receiving elements are provided. A boundary portion 17c, which should be along the planned scanning direction of the scanning laser light L passing through the reference point, is provided between 17a and 17b. Further, a reference position setting index portion 18 constituting a mark means for marking the scanning laser light position is provided at the rotationally symmetrical center position of the four light receiving elements 16a, 16b, 17a, 17b corresponding to the reference point. ing.
At the center of the reference position setting index portion 18, a main body 15c of the scanning light detection sensor 15 is formed with a reference hole 19 penetrating in the thickness direction of the main body 15c. This reference hole 19
Has a conical shape whose diameter gradually decreases toward the wall surface 14 when the main body 15c of the scanning light detection sensor 15 is in contact with the wall surface 14 (see FIG. 2).

To the left and right of the front wall 15a in FIG.
A pair of inclined surfaces 15b that are inclined from a toward the rear wall 15b (FIG. 2) is formed, and the pair of inclined surfaces 15b each have a display unit 20a positioned substantially in the same plane as the inclined surface 15b. 20b is provided. Further, below the front wall 15a in the figure, an operation switch 21 for performing on / off operation at the time of use is provided.

Next, referring to FIG. 3, the scanning light detecting sensor 15
The control system of will be described. The peak hold circuit 22 includes the first light receiving element 16 of the light receiving unit 16 via the band amplification circuit 26.
a is connected, and the peak hold circuit 22 is connected to the adder circuit 30. Further, the peak hold circuit 23 is provided with a second amplifier of the light receiving unit 16 via the band amplification circuit 27.
The light receiving element 16b is connected, and the peak hold circuit 23 is connected to the adder circuit 31. The peak hold circuit 24 is connected to the light receiving unit 1 via the band amplification circuit 28.
7 of the first light receiving elements 17a are connected, and the peak hold circuit 24 is connected to the adding circuit 30. Further, the peak hold circuit 25 is connected to the second light receiving element 17b of the light receiving unit 17 via the band amplification circuit 29, and the peak hold circuit 25 is connected to the adder circuit 31.

Peak hold circuits 22, 23, 24, 2
5, the incident laser light L receives the light-receiving portions 16 and 1 respectively.
Band amplifier circuit 2 for a time longer than the time for scanning and passing over 7.
Hold the peak value of the output from 6, 27, 28 and 29.

When the laser light L scans the light receiving portions 16 and 17, the adder circuit 30 adds the output values (light receiving amounts) of the first light receiving elements 16a and 17a of the light receiving portions 16 and 17, respectively, and compares them. Output to the discrimination circuit 32. In addition, the adder circuit 31
When the laser light L scans the light receiving parts 16 and 17,
Second light receiving elements 16b and 17 of the light receiving portions 16 and 17, respectively.
The output value (amount of received light) of b is added and output to the comparison / determination circuit 32.

This comparison / discrimination circuit 32 includes a pair of light receiving portions 1
When the output value obtained by adding the first light receiving elements 16a and 17a of each of 6 and 17 and the output value obtained by adding the second light receiving elements 16b and 17b are equal to or more than a predetermined value, these are compared and output. The difference is calculated and the determination result is output to the display control unit 33. That is, the added output values of the first light receiving elements 16a and 17a of the pair of light receiving portions 16 and 17 and the added output value of the second light receiving elements 16b and 17b are the same as the light receiving portions 16 and 17 shown in FIGS. Reference hole 1 located at the center of rotation of
When the scanning laser light L passes through 9 (reference position setting index portion 18), they become equal and fall within the allowable value. Further, the sum of the output values of the first light receiving elements 16a and 17a and the second light receiving element 16a
b, 17b, the added output value of the scanning laser light L is the reference hole 1
When vertically displaced in the vertical direction of 9, the addition output value of one becomes larger than that of the other, or the addition output value of the other becomes larger than one. 4 shows the scanning laser light L
6 and the scanning light detection sensor 15 do not collide with each other.
Indicates the case where there is a fall between the two. The symbol W in the drawing indicates the width of the laser beam L during scanning, and the symbol c indicates the center of the scanning laser beam L in the width direction.

The display control unit 33 selects a display pattern to be displayed on the display units 20a and 20b according to the output from the comparison / determination circuit 32, and outputs a signal indicating the selection result to the display units 20a and 20b. To do. As a result, the display unit 20
a and 20b display a display pattern according to the output of the display control unit 33. In the display patterns displayed on the display portions 20a and 20b, for example, the center c of the scanning width W of the laser light L and the reference hole (reference point) 19 of the reference position setting indicator portion 18 are included.
There are three modes of C, where C and M are in agreement with each other, and A and B, in which the center c of the scanning laser light L is displaced either vertically in the vertical direction with respect to the reference hole 19.

The main scanning light detection sensor 15 having the above structure
Operates as follows. First, in a state where the scanning light detection sensor 15 is held on the wall surface 14 that is the object to be surveyed, the laser light L is scanned from the rotary light projecting unit 13 of the laser surveying instrument 11 toward the wall surface 14. The setting worker who holds the scanning light detection sensor 15 in the state where the operation switch 21 is turned on in contact with the wall surface 14 is the scanning light detection sensor 1
5 is moved vertically on the wall surface 14. When the scanning light detection sensor 15 is moved in the vertical direction of the wall surface 14,
When the scanning laser light L is incident on the pair of light receiving units 16 and 17, any of the display patterns (A, B, and C in FIG. 3) displayed on the display units 20a and 20b is displayed. In this case, it is understood that the pair of light receiving portions 16 and 17 has captured the scanning laser light L, and when the incident position of the laser light L on the light receiving portions 16 and 17 changes, the display pattern displayed on the display portions 20a and 20b. Will change.

For example, as shown in FIG. 5, laser light L
When the center c of the scanning width W of the above is located above the reference hole 19 in the vertical direction, the added output value of the first light receiving elements 16a and 17a of the pair of light receiving portions 16 and 17 is the second light receiving element 16b,
Since it becomes larger than the added output value of 17b, the display units 20a and 20b are based on the determination result of the comparison determination circuit 32.
A display pattern (A in FIG. 3) indicating that the center c of the scanning laser light L is displaced upward in the vertical direction with respect to the reference hole (reference point) 19 is displayed.

While observing this display, the setting operator moves the scanning light detection sensor 15 vertically upward until the center c of the scanning width W of the laser light L passes through the reference hole 19. Then, when the center c of the scanning width W of the laser light L passes through the reference hole 19, the added output values of the first light receiving elements 16a and 17a of the pair of light receiving portions 16 and 17 and the second light receiving elements 16b and 17b. Since the added output value is equal,
Based on the determination result of the comparison / determination circuit 32, the display unit 20a,
A display pattern (C in FIG. 3) indicating that the center c of the scanning width W of the scanning laser light L and the reference hole 19 coincide with each other and are within the allowable value is displayed on 20b.

At this time, the setting operator inserts an appropriate marking means such as a pen into the reference hole 19 to mark the center c of the laser beam L, which is the reference position, on the wall surface 14. Since the reference hole 19 of the reference position setting index portion 18 is formed in a conical shape from the front wall 15a to the rear wall 15b (FIG. 2) of the main body 15c, the center is easily determined even when using a pencil or the like. This enables accurate marking.

On the other hand, when the reference surface formed by the scanning laser light L is provided with a gradient, the scanning laser light L has an angle with respect to the pair of light receiving portions 16 and 17, but the main scanning light detection is performed. The sensor 15 compares the added output values of the first light receiving elements 16a and 17a of the pair of light receiving units 16 and 17 with the added output values of the second light receiving elements 16b and 17b by the comparison / determination circuit 32, and based on the result. Display units 20a, 20b
Since the display pattern corresponding to is displayed, the center c of the scanning laser light L can be accurately detected as in the case where the reference plane is not inclined.

For example, as shown in FIG. 7, when the center c of the obliquely incident laser light L is located below the display portions 20a and 20b, the second light receiving portion 16 and the second light receiving portion 17 are in the second position.
Since the added output value of the light receiving elements 16b and 17b becomes larger than the added output value of the first light receiving elements 16a and 17a,
Based on the determination result of the comparison / determination circuit 32, the display unit 20a,
A display pattern (B in FIG. 3) indicating that the center c of the scanning width W of the scanning laser light L is displaced downward in the vertical direction with respect to the reference hole 19 is displayed on 20b.

While observing this display, the setting operator moves the scanning light detecting sensor 15 vertically downward until the center c of the scanning width W of the laser light L passes through the reference hole 19. When the center c of the scanning width W of the laser light L passes through the reference hole 19, the first light receiving elements 16a and 17 are provided.
Since the added output value of “a” and the added output value of the second light receiving elements 16b and 17b are equal to each other, similar to the above, the display unit 20
A display pattern (C in FIG. 3) indicating that the center c of the scanning laser light L and the reference hole 19 coincide with each other is displayed on a and 20b. At this point, the setting worker uses a pencil or the like for the reference hole 19
And insert the center c of the laser beam L, which is the reference position, into the wall surface 1
Mark 4

Next, a second embodiment according to the present invention will be described with reference to FIGS. In the first embodiment described above, the pair of light receiving portions 16 and 17 are respectively provided as a pair of upper and lower first and second light receiving elements 16a and 16b, and first and second light receiving elements 17 respectively.
In the second embodiment, the pair of light receiving portions 16 and 17 are provided in directions opposite to each other with respect to the planned scanning direction of the scanning laser light L passing through the reference hole 19 (reference point). The second light receiving element 16b and the first light receiving element 17a are included. That is, in the second embodiment, each of the pair of light receiving portions 16 and 17 has one second light receiving element 1.
Since it is composed of 6b and the first light receiving element 17a, it contributes to the reduction of the number of parts.

Scanning light detecting sensor 1 in the second embodiment
The control system of No. 5 will be described with reference to FIG. In the figure,
The same members as those in the first embodiment are designated by the same reference numerals. The second light receiving element 16b of the light receiving unit 16 is connected to the peak hold circuit 23 via the band amplification circuit 27, and the peak hold circuit 23 is connected to the comparison / determination circuit 32. The first light receiving element 17 a of the light receiving unit 17 is connected to the peak hold circuit 24 via the band amplification circuit 28, and the peak hold circuit 24 is connected to the comparison / determination circuit 32. Peak hold circuit 2
The laser light L entering the light receiving section 1
The output peak values from the band amplification circuits 27 and 28 are held for a time longer than the time for scanning and passing over 6 and 17.

The comparison / discrimination circuit 32 includes a pair of light receiving portions 16,
The output value of the second light receiving element 16b and the output value of the first light receiving element 17a, each of which configures 17 respectively, are compared, and the determination result is output to the display control unit 33. Then, the output value of the second light receiving element 16b and the output value of the first light receiving element 17a are determined by the scanning laser light L passing through the reference hole 19 located at the rotation center of the light receiving portions 16 and 17 shown in FIGS. When they pass, they become equal, and when the scanning laser light L deviates vertically in the vertical direction of the reference hole 19, one added output value becomes larger than the other, or the other added output value becomes larger than one. growing. FIG. 8 shows a case where the scanning laser light L and the scanning light detection sensor 15 do not collide with each other, and FIG. 10 shows a case where both of them collide with each other.

The display control unit 33 selects a display pattern to be displayed on the display units 20a and 20b according to the output of the comparison / determination circuit 32, and outputs a signal indicating the selection result to the display unit 2
Output to 0a and 20b. Thereby, the display units 20a, 2
0b displays the display patterns A, B, and C according to the output of the display control unit 33.

When surveying is performed using the scanning light detecting sensor 15 of the second embodiment, the scanning laser light L from the laser survey instrument 11 is visually observed while the scanning light detecting sensor 15 is held on the wall surface 14. Meanwhile, the detection sensor 1 is moved in the vertical direction so that the laser light L is incident. For example, as shown in FIG. 9, when the center c of the laser beam L is located above the reference hole 19 in the vertical direction, the output value of the first light receiving element 17a is the second value.
Since it becomes larger than the output value of the light receiving element 16b, the display units 20a, 20
A display pattern (A in FIG. 12) indicating that the center c of the scanning laser light L is displaced upward in the vertical direction with respect to the reference hole 19 is displayed in b.

While observing this display, the setting operator moves the scanning light detection sensor 15 until the center c of the laser light L passes over the reference hole 19. Then, when the center c of the laser light L passes through the reference hole 19, the output value of the second light receiving element 16b becomes equal to the output value of the first light receiving element 17a.
A display pattern (C in FIG. 12) indicating that the center c of the scanning laser light L and the reference hole 19 coincide with each other is displayed on a and 20b. At this point, the setting operator inserts a pen or the like into the reference hole 19 and marks the center c of the laser light L, which is the reference position, on the wall surface 14.

If the scanning laser light L has a gradient on the reference surface and the scanning laser light L has an angle with respect to the pair of light receiving portions 16 and 17, the scanning light detection sensor 15
The output value of the second light receiving element 16b and the output value of the first light receiving element 17a are compared by the comparison and determination circuit 32, and the display pattern corresponding to the display portions 20a and 20b can be displayed based on the result. Therefore, also in this case, the center c of the scanning laser light L can be accurately detected, as in the case where the reference surface has no gradient.

For example, as shown in FIG. 11, when the center c of the obliquely incident laser beam L is located below the reference hole 19, the output value of the second light receiving element 16b is the first light receiving element 17.
Since it becomes larger than the output value of a, the comparison / determination circuit 32
Based on the result of the determination, a display pattern (B in FIG. 12) indicating that the center c of the scanning laser light L is displaced downward in the vertical direction with respect to the reference hole 19 is displayed on the display units 20a and 20b. It

While observing this display, the setting operator moves the scanning light detection sensor 15 vertically downward until the center c of the scanning width W of the laser light L passes through the reference hole 19. Then, when the center c of the scanning width W of the laser light L passes through the reference hole 19, the output value of the second light receiving element 16b becomes equal to the output value of the first light receiving element 17a. A display pattern (C in FIG. 12) indicating that the center c of the scanning laser light L and the reference hole 19 coincide with each other is displayed. At this point, the setting operator inserts a pencil or the like into the reference hole 19 and marks the center c of the laser light L, which is the reference position, on the wall surface 14.

In the first and second embodiments described above, the reference hole 19 is formed in the center of the reference position setting index portion 18, and a pencil or the like is inserted into the reference hole 19 for marking. An example of the scanning light detection sensor 15 that enables unnecessary marking will be described with reference to FIG.

The scanning light detecting sensor 15 has a reference position setting index portion 18 located at the center of rotation of a pair of light receiving portions 16 and 17 at rotationally symmetrical positions, and has three kinds of holes 35a and 35b, each having a different inner diameter. 35c. The hole 3 having the largest inner diameter among these holes 35a, 35b, 35c
A large-diameter head portion 36a of a cylindrical marking point member 36 forming a marking mechanism is slidably accommodated in 5b. The small-diameter marking point portion 36b of the marking point member 36 has holes 35a, 35b,
It is slidably inserted in a hole (reference point) 35c having the smallest inner diameter among 35c. The hole 35c is the hole 35b.
To the rear wall 15b side. Hole 35b
A compression spring 37 that urges the large-diameter head portion 36a of the marking point member 36 toward the front wall 15a is contracted. The marking point member 36 has a cross-shaped groove formed at the tip of the marking point portion 36b, which allows marking points such as ink, and the marking point portion 36b is pierced when pressed by a finger or the like from the hole 35a. Ink or the like is marked on the wall surface 14 by projecting it from 35c.

According to the scanning light detecting sensor 15 having such a marking member 36, the detection of the center c of the laser light L is the same as in the first and second embodiments, but the reference position setting index. By simply pressing the marking point member 36 of the portion 18 from the front wall 15a side, a cross-shaped mark can be easily marked at a position corresponding to the center c of the laser light L. The stamping member 36 may be pressed by an electromagnetic drive mechanism that operates with a switch or the like.

In the first and second embodiments, the judgment result of the comparison / discrimination circuit 32 is displayed on the display units 20a, 20a.
Although a pattern is visually displayed on b, the present invention is not limited to this. That is, the determination result by the comparison / determination circuit 32 may be configured to be notified to the setting operator by sound, light, or the like.

Further, the pair of light receiving portions 16 and 17 can be constructed as follows. That is, the first and second light receiving elements 16a and 16b of the light receiving section 16 which are located at mutually opposite positions with respect to the planned scanning direction are provided with a plurality of pairs of light receiving elements (a, b, d, corresponding to each other). e, f). Similarly, the first and second light-receiving elements 17a and 17b of the light-receiving unit 17 which are located at mutually opposite positions across the planned scanning direction are provided with a plurality of pairs of light-receiving elements (a ', b') corresponding to each other. , D ′, e ′, f ′) (FIG. 14).

According to this structure, the positions of the scanning laser light L can be detected by adding the outputs of the upper and lower light-receiving elements corresponding to each other, as in the first and second embodiments. Since the elements are subdivided,
The junction capacitance of each light receiving element can be reduced, and the frequency characteristic can be improved.

Further, each of the pair of light receiving portions 16 and 17 is composed of a line sensor 38 or 39 such as CCD, which is long in a direction orthogonal to the planned scanning direction of the scanning laser light passing through the reference hole 19 which is a reference point. It is also possible (Fig. 1
5).

As shown in FIG. 16, the control system of the scanning light detecting sensor 15 corresponding to such a structure is a line sensor.
A peak position detection circuit 40 that receives the output of 38 and detects the bit of the peak position, and a peak position detection circuit 4 that receives the output of the line sensor 39 and detects the bit of the peak position.
1, and an adder circuit 30 'that receives the outputs from the peak position detection circuits 40 and 41 and adds the calculated bits. A display controller 33 'is provided at the next stage of the adder circuit 30'.

In the display control unit 33 ', the calculated bits added by the adding circuit 30 are added to the line sensor 38 (or 39).
When the calculated bit is larger than one line, the scanning laser beam L is determined to correspond to the reference hole 1 when the scanning laser beam L corresponds to the reference hole (reference point) 19.
It is determined that the scanning laser beam L is located below the reference hole 19 when the calculated bit is smaller than one line. In this case, upper and lower discrimination may be reversed depending on the scanning direction of the line sensors 38 and 39 . Further, the display control unit 33 ', based on these determination results, similarly to the first embodiment, the display units 20a, 2'
A display pattern to be displayed on 0b is selected, and a signal indicating the selection result is output to the display units 20a and 20b. Thereby, the display units 20a and 20b display the display patterns A, B, and C according to the output of the display control unit 33.

In this configuration, the line sensors 38, 3
The amount of deviation from one line of 9 is converted into the length, and the LCD
It is also possible to display it as a numerical value on a display device or the like. Further, the peak position detection circuits 40 and 41 may be configured to calculate the bit of the laser light center position by calculating the center of gravity or the like.

[0050]

As described above, according to the scanning light detecting sensor of the present invention, the work of detecting the scanning laser light can be easily performed without requiring any skill. Further, even when the reference plane of the scanning laser light has a gradient, the center of the laser light can be easily detected, and the wall surface can be accurately marked.

[Brief description of drawings]

FIG. 1 is a perspective external view showing a first embodiment of a scanning light detection sensor according to the present invention.

FIG. 2 is a sectional view of the same scanning light detection sensor taken along line II-II in FIG.

FIG. 3 is a block diagram showing a control system of the scanning light detection sensor.

FIG. 4 is a schematic front view showing a center coincidence state when laser light is incident on the scanning light detection sensor.

FIG. 5 is a schematic front view showing a center deviation state when a laser beam is incident on the scanning light detection sensor.

FIG. 6 is a schematic front view showing a center coincidence state when laser light is incident on the scanning light detection sensor with a gradient.

FIG. 7 is a schematic front view showing a center deviation state when laser light is incident on the scanning light detection sensor with a gradient.

FIG. 8 is a schematic front view showing a second embodiment of the scanning light detection sensor according to the present invention.

FIG. 9 is a schematic front view showing a center deviation state when a laser beam is incident on the scanning light detection sensor.

FIG. 10 is a schematic front view showing a center coincidence state when laser light is incident on the scanning light detection sensor with a gradient.

FIG. 11 is a schematic front view showing a center deviation state when laser light is incident on the scanning light detection sensor with a gradient.

FIG. 12 is a block diagram showing a control system of the scanning light detection sensor.

FIG. 13 is a cross-sectional view of a scanning light detection sensor including a manual marking mechanism.

FIG. 14 is a schematic front view showing a third embodiment of the scanning light detection sensor according to the present invention.

FIG. 15 is a schematic front view showing a fourth embodiment of the scanning light detection sensor according to the present invention.

FIG. 16 is a block diagram showing a control system of the scanning light detection sensor.

FIG. 17 is a side view showing a scanning state of laser light by a laser surveying instrument used in combination with the scanning light detection sensor according to the present invention.

FIG. 18 is a side view showing a scanning state of a scanning light detection sensor for laser light by the laser surveying instrument.

[Description of Reference Signs ] 11 Laser surveying instrument 14 Wall surface 15 Scanning light detection sensor 15c Main body 16 Light receiving portion 16a First light receiving element 16b Second light receiving element 17 Light receiving portion 17a First light receiving element 17b Second light receiving element 18 Reference position setting indicator portion (Marking means) 19 Reference hole (reference point, marking means) 20a Display section (informing means) 20b Display section (informing means) 32 Comparison determination circuit (output difference detection circuit) 35c Hole (reference point) 36 Marking point member (mark Means, marking mechanism) 37 compression spring (marking mechanism) L laser light

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noriaki Takahashi 2-36-9 Maeno-cho, Itabashi-ku, Tokyo Asahi Optical Co., Ltd. (56) Reference JP-A-1-259215 (JP, A) JP Showa 62-197717 (JP, A) Actual development 3-93720 (JP, U) Actual development 2-65111 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) G01C 15 / 00

Claims (7)

(57) [Claims] 1. A scanning light detection sensor, which is used in combination with a laser surveying instrument for forming a reference plane by a scanning laser light, for detecting the position of the scanning laser light projected on a wall surface. A pair of light receiving portions arranged at rotationally symmetric positions around the reference point, each of the pair of light receiving portions being long in a direction orthogonal to the planned scanning direction of the scanning laser light passing through the reference point, and A pair of light-receiving elements formed of a pair of light-receiving elements provided at mutually opposite positions across the scanning direction, and an adder circuit for adding output values of the light-receiving elements provided in the same direction with respect to the planned scanning direction An output difference detection circuit for detecting an output difference of the adder circuit, an informing means for informing predetermined information according to an output from the output difference detection circuit, and a scanning laser beam provided at the reference point. Scanning light detecting sensor, characterized in that it comprises a mark unit for marking the location, the. 2. A scanning light detection sensor, which is used in combination with a laser surveying instrument for forming a reference plane by a scanning laser light and detects the position of the scanning laser light projected on a wall surface, and a reference point, A pair of light receiving parts arranged in a rotationally symmetrical position about the reference point, an output difference detection circuit for detecting the output difference between the pair of light receiving parts, and the output difference between the pair of light receiving parts is within the allowable value. And a mark means for marking the position of the scanning laser light provided at the reference point. The pair of light receiving portions are orthogonal to the planned scanning direction of the scanning laser light passing through the reference point. The scanning light detection sensor comprises one light receiving element which is provided at a position opposite to each other across the planned scanning direction. 3. The scanning light detecting device according to claim 1, wherein each of the pair of light receiving portions is provided with a plurality of sets of corresponding one pair of light receiving elements provided at positions opposite to each other with the planned scanning direction interposed therebetween. Sensor. 4. A scanning light detection sensor, which is used in combination with a laser surveying instrument for forming a reference plane by a scanning laser light and detects the position of the scanning laser light projected on a wall surface, and a reference point, A pair of light receiving portions arranged at rotationally symmetrical positions about the reference point, a peak position detecting circuit for detecting a bit at the peak position of the output of the pair of light receiving portions, and an output of this peak position detecting circuit are added. An adder circuit, an informing unit that determines the relationship between the scanning laser beam and the reference point based on the calculated bits added by the adder circuit, and provides predetermined information based on the result of the determination, and an informing unit provided at the reference point. And a mark means for marking the position of the scanning laser light, and each of the pair of light receiving portions is long in a direction orthogonal to the planned scanning direction of the scanning laser light passing through the reference point. Scanning light detecting sensor characterized by comprising a line sensor such as a CCD. 5. The mark means according to any one of claims 1, 2 and 4, wherein the mark means has a reference hole formed in the main body of the scanning light detection sensor so as to penetrate in the thickness direction of the main body. Scanning light detection sensor equipped. 6. The scanning light detection sensor according to claim 5, wherein the reference hole is a conical hole whose diameter gradually decreases toward the wall surface when the main body of the scanning light detection sensor is in contact with the wall surface. . 7. The marking hole mechanism according to claim 5, wherein the reference hole is provided with a marking point mechanism that moves toward the wall surface and marks the wall surface in a state where the main body of the scanning light detection sensor is in contact with the wall surface. Scanning light detection sensor.