JPH049536Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field of the Invention) The present invention relates to an electronic theodolite equipped with an azimuth setting function.

(Background of the idea) Traditionally, to measure magnetic north, a magnetic needle (orientation compass) attached to a theodolite is used, and the theodolite is pointed in the magnetic north direction using the scale of the orientation compass as a guide, and the horizontal scale is set at 0°. I was setting the azimuth angle. For this reason, there were drawbacks such as poor work efficiency and deterioration of accuracy due to individual differences.

(Purpose of the invention) The purpose of the invention is to solve these drawbacks and to obtain a theodolite that is easy to work with and eliminates deterioration of accuracy due to individual differences.

(Summary of the invention) The invention consists of horizontal angle signal output means 1 and 2 that output a horizontal angle signal ∠A, an azimuth sensor 6 that outputs an angle signal ∠B from magnetic north, and an azimuth angle setting command signal. An azimuth angle setting command means 5 is connected to the output, the azimuth angle sensor, and the azimuth angle setting command means, and is connected to the azimuth angle setting command signal.
−∠A, and a calculation means 3 for calculating and storing ∠B−∠A to the horizontal angle signal from the output means to obtain a horizontal angle. It is a theodolite.

(Embodiment) FIG. 1 is a block diagram of an embodiment of the present invention.
The horizontal angle reading device 1 consists of stacking a scale disk with bright and dark stripes formed at equal pitches and an index scale plate and sandwiching them between photocouplers, and electrically detecting changes in the brightness and darkness of light caused by the degree of overlap between the two by rotating the scale disk. This is a so-called rotary encoder that exchanges the changes in the optical field and outputs it as a pulse. This is to measure the rotation angle (horizontal angle) between the rotating body and a base (not shown) that rotates around a vertical axis.
That is, for example, the scale disk is fixed to a rotating body, and the index scale plate and photocoupler are fixed to a base plate.

Pulses output from the scale reading device 1 are counted by a counting circuit 2 and transmitted to a storage/arithmetic device 3. The storage/arithmetic device 3 performs arithmetic operations based on this signal and displays the horizontal angle on the display device 4.

Further, a keyboard 5 is connected to the storage/arithmetic device 3, and operates according to various commands from the keyboard 5. However, what is related to the present invention is the azimuth angle setting operation commanded by the azimuth angle setting switch of the keyboard 5. and the azimuth command operation commanded by the azimuth display switch. Furthermore, an azimuth signal from an azimuth angle sensor 6 is input to the storage/arithmetic device 3 . The azimuth sensor 6 is provided on a rotating body (theodolite body) not shown, and outputs an electric signal corresponding to the azimuth angle, that is, an electric signal corresponding to the angle of the collimation direction with respect to the magnetic north N. Orientation sensor head (Hitachi Metals Co., Ltd. product)”
It is commercially available as. When the azimuth angle setting command is input from the azimuth angle setting switch, the storage/arithmetic unit 3 subtracts the horizontal angle from the counting circuit 2 from the angle from the azimuth angle sensor 6, and the value is calculated based on the 0 degree direction of the horizontal angle and the magnetic north. Remember this because it is the angle formed by

Thereafter, correction and arithmetic processing are performed in the storage/arithmetic device 3 such that the stored angle is added to the horizontal angle from the counting circuit 2 and exchanged with the azimuth, and the azimuth is displayed on the display device 4. .

Figure 2 is for visually explaining the operation of the above-mentioned embodiment, and shows that the sighting telescope of the theodolite is
The theodolite is oriented at an angle ∠ from the 0° direction.
Assume that A (horizontal angle) is displayed. When the theodolite's azimuth setting switch (not shown) is turned on, the signal from the azimuth sensor 6 is captured, and the telescope is measured to be at a position ∠B from magnetic north N, indicating the 0° direction of the theodolite. is from magnetic north ∠B−∠A=∠
It is determined by calculation that the position is off by C. This ∠C is stored, and the azimuth ∠B is displayed on the display device 4. If the theodolite is sighted at the next sighting point without moving the position, the angle (azimuth) from the magnetic north N direction can be measured.

Next, FIG. 3 shows a flowchart in the case where the storage/arithmetic device 3 is configured with a microcomputer.

In FIG. 3, when the angle display flow starts, it is determined in step 30 whether or not an azimuth setting command has been issued from the azimuth angle setting switch. A number corresponding to the horizontal angle is displayed as a horizontal angle on the display device 4 (step 31), and if the end switch of the keyboard 5 is not turned on, the process returns to step 30, and if the switch is turned on, the process ends (step 32). ). If the azimuth angle setting command is issued in step 30, the horizontal angle ∠A obtained from the counting circuit 2 is converted into the azimuth angle ∠ obtained from the azimuth sensor 6.
Subtract it from B to find the angle ∠C between the 0 degree horizontal angle and magnetic north (step 33), and store it (step 34). Next, read the horizontal angle value ∠A' from the count value of counting circuit 2 (step 35), and read ∠A'+
∠C is displayed on the display device 4 (step 36).
If the end switch of the keyboard 5 is not turned on, the process returns to step 35, and if the end switch is turned on, the process ends (step 37).

(Effects of the invention) As described above, the invention not only has the advantage of improving work efficiency since it is not necessary to align the theodolite with the magnetic north direction as described above, but also has the effect of eliminating individual differences among workers. can be expected.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a diagram for explaining the operation of the embodiment of the present invention, and Fig. 3 is a flowchart when a microcomputer is used as an embodiment of the present invention. , is. Explanation of symbols of main parts, 1...Horizontal angle reading device, 2...Counting circuit, 3...Storage/arithmetic device, 5...
...Keyboard, 6... Direction Sanse.

Claims (1)

[Scope of utility model registration request] a horizontal angle signal output means for outputting a horizontal angle signal ∠A; an azimuth angle sensor for outputting an angle signal ∠B from magnetic north; an azimuth angle setting command means for outputting an azimuth angle setting command signal; It is connected to the azimuth angle sensor and the azimuth angle setting command means, and calculates and stores ∠B−∠A according to the azimuth angle setting command signal, and also outputs the ∠B−∠ to the horizontal angle signal from the output means. A theodolite equipped with an azimuth angle setting function, characterized in that it has a calculation means for adding A to obtain a horizontal angle.