JPS637850Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an altitude angle correction device for surveying instruments such as theodolites.

Conventional altitude angle correction in theodolites, etc. is a method of detecting the difference between the vertical axis determined by gravity and the high angle reference of the device, and applying that amount as a correction amount to the altitude angle measurement value of the device. There is. For example, an embodiment thereof is described as a level sensor in Japanese Patent Laid-Open No. 53-64056. This method uses a sinusoidal detection element to obtain the tilt angle of the vertical axis by phase comparison between the reference signal and the detection signal, and also uses a complex configuration of elements that require high precision, such as driving the light source at 375Hz. It was necessary to place it.

The purpose of the angle measuring device according to the present invention is to detect the inclination of the device with an extremely simple configuration and to accurately determine the corrected altitude angle. An embodiment of the device of the present invention will be described in detail below with reference to the drawings.

There is a constant velocity rotating disk, and the relationship between a certain fixed point (reference point) on the circumference around the center of rotation and a measurement point provided on a rotatable arm that can rotate on the circumference. An angle measuring device that calculates an angle by 360° x (time required to rotate from a reference point to a measurement point) ÷ (time required for a constant velocity rotating disk to rotate once) is known. Such angle measuring devices are available for example from USARMY
ENGINEER TOPOGRAPHIC
LABORATORIES report: Report ETL−
TR-72-1 [WW Seemuller: An Electronic
There is a method reported in Angle-measuring Device (1972.1). This angle-measuring device has the feature of being able to measure absolute angles from a reference point, but there is a method for correcting the tilt of the device when measuring altitude angles. There is no mention of anything.

FIG. 1 is a diagram showing an embodiment of the configuration of the device of the present invention. 1 is a collimating telescope, which is rotatable around the rotation axis A. A disk 2 is attached to one end of the shaft supporting the collimating telescope 1, and a magnetoelectric conversion element (for example, a Hall element) 3 for measuring rotational angle is attached around the disk 2. Therefore, collimating telescope 1
There is a 1:1 correspondence between the rotation angle in the vertical direction and the rotation angle of the Hall element 3. Further, 4 is a motor, and the rotation axis of the motor 4 is adjusted so as to coincide with the rotation axis A, and is attached to the theodolite main body. A rotating disk 5 is attached to the end of the rotating shaft of the motor 4. Since the motor 4 is electrically controlled to rotate at a constant speed, a magnetic body (for example, a permanent magnet) 6 fixed to the circumference of the rotating disk 5 also rotates around the rotation axis A at a constant speed. Furthermore, 7 is a hanging plate, and the hanging plate 7 is rotatable only around the rotation axis A by means of a hanging plate support 8 and a ball bearing 9. The hanging plate 7 always hangs down in the vertical direction due to the action of the weight 10 attached to the end. A magnetoelectric conversion element (for example, a Hall element) 11 for detecting a reference point is mounted on the hanging plate 7.
is fixed on the vertical line. The magnetoelectric transducer 11 for reference point detection can be used even if the theodolite main body is tilted to some extent due to the action of gravity.
It is clear that it is always on the vertical line and can be used as a reference when measuring the altitude angle.

Regarding electrical processing, the above report:
Although it is also stated in Report ETL-TR-72-1, it will be explained with reference to FIG. The outputs from the magnetoelectric transducer 3 for rotation angle measurement and the magnetoelectric transducer 11 for reference point detection are amplified and waveform shaped circuits 21 and 22, respectively.
The waveform is shaped into a rectangular wave. The output whose waveform has been shaped by the amplification/waveform shaping circuit 22 is input to the gate circuit 23 and the microprocessor 24, and the output whose waveform has been shaped by the amplification/waveform shaping circuit 21 is inputted to the microprocessor 24 and the latch circuit 27. be done. A clock from an oscillation circuit 25 is input to the gate circuit 23. Microprocessor 24 has an output for resetting a counter circuit 26 that counts the clocks from oscillation circuit 25 that have passed through gate circuit 23. Further, a latch circuit 27 that latches the output of the counter circuit 26 is provided with a latch signal for the latch circuit 27 from an amplification/waveform shaping circuit 21 that provides a rotation angle detection signal. Note that 28 is a display circuit section.

The working of the circuit is as follows. First, the microprocessor 24 resets the counter circuit 26. When the magnetic body 6 in FIG.
The waveform-shaped reference point detection signal is sent to the gate circuit 2.
3 is opened to input the clock from the oscillation circuit 25 to the counter circuit 26. At the same time, it notifies the microprocessor 24 that it has entered the angle measurement state. The magnetic body 6 continues to rotate at a constant speed, and the collimating telescope 1
When the magnetoelectric transducer 3 for rotational angle detection is turned on at an angle corresponding to the inclination of The latch circuit 27 is operated to latch the contents C _M of the circuit 26. Microprocessor 24
At this point, inputs and stores the counter content signal C _M corresponding to the rotation angle.

Furthermore, when the magnetic body 6 continues to rotate at a constant speed and the reference point detection magnetoelectric conversion element 11 is turned on again, the amplified and waveform-shaped reference point detection signal is sent to the gate circuit 23.
is turned OFF, and the clock input to the counter circuit 26 is stopped. At the same time, microprocessor 2
4 of the completion of one rotation of the magnetic body 6. Since the latch circuit 27 is released from the latch state and begins to indicate the counter contents at the end of one revolution, the microprocessor 24 inputs the counter contents C _R at the end of one revolution. Then, the microprocessor 24 calculates 360°×C _M /O _R from these two inputs C _M and C _R , and displays the calculation result on the display circuit section 28 .

In the above angle measurement, the reference point detection magnetoelectric transducer 11 always hangs down in the vertical direction due to the action of the hanging plate 7 and the weight 10, providing a reference point that is not affected by the inclination of the theodolite main body. Even if the reference point detection magnetoelectric transducer 11 deviates by a slight angle (for example, 1') from the completely ideal vertical direction, the slight angle (1' in the example) is reproducible and the microproducer is It is also possible to store the deviation amount in the setter 24 and correct the deviation amount during subsequent calculations.

In this way, the device of the present invention has a simple configuration in which a magnetoelectric transducer for detecting a reference point is installed on a hanging plate, and the altitude angle from the reference point can be measured without being affected by the tilt of the device itself, making it extremely effective. This is a highly practical improvement.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing an embodiment of the device of the present invention;
The figure is a block diagram showing an example of an electrical processing section. A: Rotation axis, 1: Sighting telescope, 2: Disk, 3:
Magnetoelectric conversion element for rotation angle measurement, 4: motor, 5: rotating disk, 6: magnetic material, 7: hanging plate, 8: hanging plate support, 9: ball bearing, 10: weight, 1
1: Magnetoelectric conversion element for reference point detection, 21, 22: Amplification/waveform shaping circuit, 23: Gate circuit, 24: Microprocessor, 25: Oscillator circuit, 26: Counter circuit, 27: Latch circuit, 28: Display circuit Department.

Claims (1)

[Claims for Utility Model Registration] 1. There is a constant velocity rotating disk, and there is a certain reference point on the circumference around the center of rotation, and a measurement point provided on the rotatable disk that can rotate on the circumference. In an angle measuring device, the angle formed by is calculated as 360° x (time required for a constant velocity rotating plate to rotate from a reference point to a measurement point) ÷ (time required for a constant velocity rotating plate to rotate once), etc. A magnetic body provided on a fast rotating disk, a hanging plate that can rotate around the rotation axis of the constant speed rotating plate and hangs vertically due to the action of gravity, and a hanging plate that has the rotation axis attached to it. 1. An altitude angle measuring device for automatically correcting the inclination of an instrument, characterized by having a vertical reference point detection mechanism comprising a magneto-electric transducer mounted on a vertical position including the vertical direction. 2. The altitude angle measuring device according to claim 1, wherein the magnetoelectric conversion element is a Hall element.