JP3406022B2 - Positioning indicator using laser light - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finger for positioning an object with reference to a laser beam irradiation center (optical axis).
Display device . 2. Description of the Related Art In recent years, in assembling members of a shipbuilding or a large building, a method of irradiating a laser beam to save surveying work time and assembling and constructing each member based on a spot point thereof. Is being done. [0003] However, when the irradiation distance exceeds several tens of meters, there is a problem that the spot is widened or deformed and the exact center position cannot be determined. For example, when the irradiation distance is 50 m, the size of the spot is 10 m.
It has a size of about m and is deformed into a non-circular shape far from a circular shape. The accuracy required for surveying is generally 1-2 m
m, which hinders positioning. This is because the accuracy of the optical system of the laser beam emitting device is limited. Accordingly, an object of the present invention is to provide a positioning device using a laser beam that can shorten the work time for positioning survey and improve the accuracy of positioning survey. SUMMARY OF THE INVENTION In view of the foregoing, the present invention provides a laser light emitting tube, a rotating device for rotating the laser light emitting tube about a laser optical axis, and a positioning pair.
A sensor attached to the elephant, divided into at least one axial direction, receiving a laser beam emitted by the laser light emitting tube and detecting each light amount in each divided region, and the rotation of the laser light emitting tube When rotating by the device, is it possible to calculate the time average of each light amount in each of the divided regions in at least one axial direction and output the respective light amount values?
Alternatively , there is provided a positioning instruction device using laser light, comprising: a device capable of outputting a magnitude comparison between them . When the light quantity is detected by the sensor while rotating the laser light emitting tube around the laser optical axis by the rotating device, even if the irradiation spot of the laser light spreads out in a non-circular shape, each axis direction of the sensor is detected. By calculating the time-average light amount in each of the divided regions, the direction of the shift of the optical axis (irradiation center) of the laser beam with respect to the sensor can be determined based on the magnitude of the average light amount. Is moved to correct the deviation, and accurate positioning can be performed. Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the accompanying drawings. FIG. 1 shows the positioning according to the present invention.
FIG. 2 shows a pointing device , and FIG. 2 shows a photoelectric converter 16 as a sensor.
FIG. The laser light emitting tube 10 emits the laser light 14 in a predetermined direction, moves the photoelectric converter 16 attached to the positioning target (not shown) together with the target, and positions the laser to receive the irradiation of the laser light 14. . As described above, when the distance from the laser light emitting tube 10 to the photoelectric converter 16 is long, the laser light 14
The non-circular irradiation spot area 14S spreads out as shown by hatching in FIG. 2, and the position of the optical axis 14C of the laser beam in the spot area 14S, that is, the irradiation center becomes unclear. In order to detect this irradiation center position and perform accurate positioning of the object, the photoelectric converter 16 is moved in two orthogonal X-axis and Y-axis directions.
The laser light emitting tube 10 is divided into four regions Z1, Z2, Z3, and Z4 by dividing the laser light emitting tube 10 around the optical axis 14C of the laser light 14 to be emitted, that is, the optical system of the laser light emitting tube 10 Times that can be rotated around the center
A motor 12 as a rotating device (rotary power device) is attached to the rear part. Then, the four regions Z1, Z2, Z3,
Z4 is configured to be able to detect the amount of light applied to each region and convert it to an electric signal. In addition, each electric signal is transmitted to a comparison output device 18 which calculates a time average of each signal and makes a magnitude comparison between the electric signals through signal lines L1, L2, L3, and L4 as described later. This comparison output device 1
The output of 8 is output to the display device 20. An operator for positioning the object uses the motor 12 to drive the laser light emitting tube 1.
0 is rotated about the optical axis 14C, and the display device 20 is rotated.
Is moved so that the reference point S0 of the photoelectric converter 16 coincides with the optical axis 14C of the laser light 14 while observing the display of. Thereby, accurate positioning of the object can be performed in a short time. Hereinafter, the operation of the photoelectric converter 16 and the comparison output device 18 will be described in detail with reference to FIG. Spot area 1 where laser light 14 was applied to photoelectric converter 16
When the distance to the photoelectric converter 16 is long, the 4S generally spreads non-circularly as shown in FIG. For this reason,
The position of the optical axis 14C is unknown. When the laser light emitting tube 10 is rotated by the motor 12 in order to detect this position, the whole area is illuminated within the circle 14M shown by the dashed line in FIG. As can be generally understood by comparing the size of the irradiation area in each area, in this example, the optical axis 14C
Exists in the area Z4. To actually detect this,
The comparison output device 18 (FIG. 1) compares the magnitude of the temporal average light quantity irradiating the areas Z1 and Z4 detected by the photoelectric converter 16 with the temporal average light quantity irradiating the areas Z2 and Z3. ), The X of the optical axis 14C
The deviation in the axial direction can be seen. Similarly, the comparison output device 18 compares the magnitude of the temporal average light quantity irradiating the areas Z1 and Z2 with the temporal average light quantity irradiating the areas Z3 and Z4.
By doing so, the deviation state of the optical axis 14C in the Y-axis direction can be determined. The display device 20 (FIG. 1) shows such a deviation state.
, The operator can easily correct the position of the target to which the photoelectric converter 16 has adhered. The comparison output device 18 can be made small by a microcomputer or the like, and the photoelectric converter 16 can be attached to the object by a magnet when the object is made of steel. Furthermore, in the irradiation of the laser beam 14 to the photoelectric converter 16, it is desirable to cover the surface of the photoelectric converter 16 with an interference filter in order to prevent the influence of disturbance light on the photoelectric converter 16. In the above embodiment, the photoelectric converter 16 is divided into four parts.
For example, the case of dividing into two in only one X-axis direction is also within the scope of the present invention. FIG. 2 shows a case in which the regions Z1 and Z4 are integrated regions, and the regions Z2 and Z3 are integrated regions. In this case, the position of the target to which the photoelectric converter 16 is attached in the Y-axis direction is constant, and the target can be moved only in the X-axis direction. The same applies to the case where the image is divided into two in the one axis direction which is the Y axis direction. The comparison output device 18 may be a device that simply outputs the time average light amount for each area without comparing the magnitudes. The operator looks at the output result of the light quantity for each area displayed on the display device 20, judges the deviation state in the X-axis and Y-axis directions, and moves the object to which the photoelectric converter 16 is attached as appropriate. Then, the deviation state is corrected. This operation is 1
Accurate positioning of the object can be performed by performing the operations more than once. FIG. 3 shows steel frames A1, A2, B1, at the construction site.
FIG. 6 shows a plan view of the steel frame B2 and the like during assembly, in which a steel frame B2 is mounted on an already erected steel frame A2, and a reference point P for mounting the steel frame B1 on another steel frame A1.
0 (the position where the photoelectric converter is attached) and a line connecting the laser light emitting tube (not shown) (the laser light to be emitted)
And the steel frame B2 exists between the optical axis 14C ′ and the reference point P0. Therefore, a position P1 which is a predetermined distance LX away from the reference point P0 is determined as a new reference point, and the photoelectric converter 16 is attached thereto and a laser beam is irradiated.
By performing the above-described operation for accurately matching the laser beam with the optical axis 14C of the laser beam, the steel frame B1 can be accurately positioned with respect to the existing steel frame A1, and can be assembled in that state. As is apparent from the above description, according to the present invention, since the laser beam is used, positioning and surveying can be performed in a short time, and the optical axis position can be adjusted by rotating the laser beam emitting tube. , The accuracy of positioning and surveying is improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a positioning instruction device according to the present invention. FIG. 2 is an operation explanatory view of the apparatus of FIG. 1; FIG. 3 is a schematic explanatory view of use of the apparatus of FIG. 1 at a construction site. [Description of Signs] 10 Laser light emitting tube 12 Motor 14 Laser light 14C Optical axis 14S Irradiation spot area of laser light 16 Photoelectric converter 18 Comparative output device 20 Display device S0 Reference point of photoelectric converter

Claims (1)

(57) [Claims 1] A laser light emitting tube, a rotating device for rotating the laser light emitting tube about a laser optical axis, and a rotating device attached to an object to be positioned and having at least one axial direction. A sensor that receives the laser light emitted from the laser light emitting tube and detects each light amount in each divided region; and the at least one axis when the laser light emitting tube is rotated by the rotating device. Calculates the time average of each light amount in each divided region in the direction, and can output each light amount value.
And a device capable of outputting a magnitude comparison between the two. A positioning instruction device using laser light, comprising: