JPH01299409A - Sensing device of light flux forming plane - Google Patents

Abstract

PURPOSE:To dispense with an adjusting operation, to read the position of a light flux directly and thereby to improve an operability, by connecting a standard length rod of a proper length to a frame body prior to measurement and by making a laser light incident on the frame body in the measurement. CONSTITUTION:When a standard length rod is connected to a frame body and pins 4 and 5 are connected together, an AND circuit 50 turns to be of high level, and when another standard length rod is connected to the frame body and pins 5 and 6 are connected together, an AND circuit 51 turns to be of high level. Accordingly, an arithmetic circuit 52 discriminates the standard length rods according to which of the circuits 50 and 51 is at a high level. A sensed light output of the frame body is inputted to a selection circuit 54, a light-sensing element whereon a laser light flux is incident is determined, and an output thereof is inputted to the circuit 52 through a conversion circuit 53. The circuit 52 adds up a distance from the lower end of the frame body to the light-sensing element and the length of the standard length rod and displays the sum as the height position of the laser light flux. Thereby the position of the light flux can be read directly and thus operability is improved.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a surveying device that detects the position of a beam forming a plane, such as when performing leveling by rotating and scanning a laser beam within a horizontal plane. This invention relates to a light receiving device.

(Prior art) A laser beam is emitted as a light source toward a surveying object, and by scanning the beam in a horizontal plane, the height of the laser beam is detected on the surveying object using the surveyor's eyes or a photoelectric detector. Automatic surveying devices are known.

In order to conduct surveys simply and quickly, a receiver with a photoelectric detector is used, and the receiver is installed so that it can slide freely in the longitudinal direction of the staff, and the surveyor raises and lowers the receiver on the staff held upright to detect the light. The center position of the laser beam was detected by the signal from the device, and the height position of the laser beam was measured from the value of the leveling rod at that time.

(Problems to be solved by the invention) In such conventional devices, the surveyor raises and lowers the receiver,
It was necessary to judge the center position and read the value on the staff, which made work difficult and it cannot be said that surveying was always carried out quickly.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a light receiving device that can directly read the position of a light beam forming a plane, has a wide measurement range, and has a simple configuration.

(Means for Solving the Problems) The present invention focuses on the fact that in a series of surveys, the position of the light beam forming a plane is generally within a predetermined narrow range. A light receiving part is provided on the frame over a predetermined length to cover, and the light flux is detected statically.In addition, in order to expand the measurement range, rods of different lengths can be selected and added to the frame. The present invention is characterized in that it is provided with a calculation means for determining the position of the plane from the light-receiving portion that receives the light and the length of the fixed-length rod attached to the frame.

(Function) According to the present invention, by simply selecting a standard length of the optimal length and adding it to the frame at the beginning of surveying work, the frame can be moved to the measurement point without any adjustment work. Just by installing it, you can obtain a flat position.

Therefore, it is possible to obtain a light-receiving device for a surveying instrument with a simpler structure and substantially no deterioration in functionality compared to a structure in which a light-receiving section is formed over the entire measurable range.

(Example) The present invention will be described below based on the example shown in the drawings.

Figures 1 (a) and (b) show fixed-length bars 2a and 2 of different lengths.
This shows how b is added to frame 1. A plurality of light receiving sections 1a are arranged in series on the frame 1 over a predetermined length. The light receiving section 1a may be a photoelectric conversion element such as a photodiode, or the light receiving section 1a may be one end surface of an optical fiber.
Alternatively, a light receiving element such as a photodiode may be provided on the end face. Furthermore, it is also possible to use an element that outputs a coordinate signal according to the incident position of the light beam, such as a position sensor. In this case, the number of light receiving sections can be considered as one. The display section 1b displays the height of the Rede luminous flux.

As shown in FIG. 2, a mounting recess 3 having a cross-sectional shape of a partially cut out circle is formed on the lower end surface of the frame 1.
Three bins 4.5.6 are provided around the periphery. The bin 4.5.6 is configured to be biased downward by a spring, as shown in FIG. 4, which is a sectional view taken along line A-A' in FIG.

As shown in FIG. 3(a), the standard length rod 2a has a mounting protrusion 7 on its upper end that fits into the mounting recess 3, and is connected to each other at a position corresponding to the length a. It has a contact point 8.9. As shown in FIG. 4, this contact point 8.9 acts to push the corresponding bottle 4.5 into the frame 1 against the biasing force of the spring. Contact 8
．． 9 connection is ensured.

As shown in FIG. 3(B), the standard length bar 2b is the same as the standard length bar 2a in that it has a mounting protrusion 10 on its upper end that fits into the mounting recess 3, but its length b It has contacts 11, 12 connected to each other at positions corresponding to. This contact point 11
12 connects with bin 5.6 in FIG.

As shown in FIG.
．． A conical recess I3 is formed in the side surface of the frame 10, and a clamp screw 14 is screwed into the recess 13 from the side surface of the frame 1, so that the frame 1 and the length bars 2a, 2b are integrated.

FIG. 5 is an electrical block diagram, and when the fixed length rod 2a is connected to the frame 1 and the bins 4 and 5 are connected, the output of the AND circuit 50 changes from a low level to a high level. .

Further, the fixed length rod 2b is connected to the frame 1 and the bins 5 and 6 are connected to each other.
When connected, the output of the AND circuit 51 changes from low level to high level. Therefore, AND circuit 50.51
The arithmetic circuit 52 which inputs the outputs of is able to determine which fixed length rod is added to the frame body 1 depending on which input is at a high level.

The light receiving device 56 is a row of light receiving sections 1a shown in FIG.
The output of each light receiving section is input to the selection circuit 54, and the selection circuit 5
No. 4 determines that one of the light receiving sections is the light receiving section into which the laser beam is incident. That is, when the laser beam is incident on two adjacent light receiving sections, the light receiving section with the higher output level is selected. The output of the selection circuit 54 is generated at a terminal corresponding to the light receiving section that received the laser beam, and the conversion circuit 53 inputs a digital signal corresponding to the terminal where the output of the selection circuit 54 is generated to the arithmetic circuit 52.

As a result, the arithmetic circuit 52 calculates the distance 2. , the length of the fixed length bar i
2 is added to lI +12, which is displayed on the display device 57 as the height position of the laser beam.

The display device 57 includes the display section 1b in addition to the display section 1b shown in FIG.
This includes a drive device for liquid crystal, etc. as b.

In FIG. 5, a broken line block 55 is a calculation means, and a broken line block 56 is a light receiving device in which a light receiving section is connected.

With this configuration, if a standard length girder of an appropriate length is connected to the frame 1 prior to leveling, the surveyor can simply bring the light receiving device to the measuring point and view the display section 1b. The height position of the laser beam can be displayed.

In the above description, an example was given in which two types of lengths are selected as the standard length rods, but the same identification can be performed even when a larger number of standard size rods of different lengths are prepared.

In addition, in the above explanation, the type of the standard length bar was identified by the contact between the pin and the contact, but other configurations may be used, for example, a number (maximum n) of magnets corresponding to the type of the standard length bar may be embedded. , the frame may be provided with n magnetic sensors for identifying the number of magnets in the fixed length bar.

Furthermore, the identification of the type of standard length bar does not have to be done automatically; for example, the surveyor may input the type or length of the standard length bar into the calculation means using an input means such as a numeric keypad. good.

In addition, although the above explanation has been based on the case of leveling, that is, the case where the laser beam is rotated and scanned within a horizontal plane, it is also possible to use a case where the laser beam is diffused within a horizontal plane to prevent rotational scanning. The light receiving device of the present invention can be similarly applied. Furthermore, the light receiving device of the present invention can be similarly applied even to devices that scan a light beam within a vertical plane.
In the above example, the position of the luminous flux was measured in the vertical direction with reference to the ground, etc., but in this case, the position of the luminous flux was measured in the horizontal direction with reference to a vertical wall, etc. .

(Effects of the Invention) As described above, according to the light receiving device of the present invention, the position of the light beam can be directly read, and a light receiving device with a wide measurement range and a simple configuration can be obtained.

[Brief explanation of the drawing]

Figures 1 (A) and (B) are diagrams showing a light receiving device according to an embodiment of the present invention in which a fixed-length bar is added to the frame, Figure 2 is a diagram showing the lower end surface of the frame, and Figure 3 ( A) and (B) are views showing the upper end surface of the standard length rod, and Figure 4 is the frame body and the standard length rod as seen in the cross section along the line A-A' in Figure 2 (Figure 3 ((A)). FIG. 5 is an electrical block diagram of an embodiment of the present invention. (Explanation of symbols of main parts) 1... Frame 1a... Light receiving section 2a,
2b...Standard length bar 55...Calculating means 56...Light receiving device (a) (b) Figure 1 spear 40

Claims (1)

[Scope of Claim] A light receiving device for a surveying device that detects the position of a light beam forming a plane, comprising: a frame body provided with a light receiving section over a predetermined length; and standard length rods of different lengths connected to the frame body. and a calculation means for calculating the position of the plane from the length of the fixed length rod connected to the frame and the position of the light receiving section that receives the light beam.