JPH055285B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a rotating irradiation type automatic leveling device, specifically, an automatic leveling device that guides a vertical light beam obtained by an appropriate optical system to rotating mirrors. This invention relates to improvements in measurement accuracy and portability of a leveling device that emits an optical plane for use.

(Prior Art) Various types of automatic leveling devices of this type are available for general civil engineering and construction work.
The outline of its typical configuration is shown in Figure 2, (apparatus)
A vertical light beam 5 emitted from an optical system 4 including a light source, at least partially suspended by a flexible hanging wire 2 suspended from a housing 1, passes through a pentagonal prism 6 or a rotating mirror and becomes a horizontally directed light beam 7, A desired optical horizontal plane is created as a motor 9 with a reduction gear rotates to drive a rotating shaft 8 attached to the rotary shaft 6 . Reference numerals 10 and 11 denote a brake plate provided on the optical system to limit vibrations of the optical system 4 due to external impact during use, and a magnet attached to the housing 1 in opposition to the brake plate. The light source built into this optical system is generally made of a magnetic material. That is, the current situation is that light emitting diodes and laser tubes that are widely used these days have no choice but to use magnetic materials at least in part. Therefore, in conventional automatic leveling devices that use the gravity acting on the pendulum body to operate the automatic leveling function, in addition to the gravitational force of the earth, the gravitational force of the earth's magnetic field acts, which interferes with the automatic leveling function of the main unit. Become.

By the way, this strong geomagnetic field has a horizontal component in the Okinawa region.
In Hokkaido, it is 0.35 Gauss, and in Hokkaido it is 0.26 Gauss, and there is an even larger difference between the equatorial region and the Arctic or Antarctic regions. Therefore, it becomes impossible to ignore the effects of such regional differences in geomagnetic strength and other various external magnetic fields on level measurement, which causes a decline in measurement accuracy.

However, conventional automatic leveling devices are not designed in consideration of the effects of geomagnetism and the like. In addition, slight precision errors in precision assembly and adjustment of optical systems are unavoidable, and the optical axis of the emitted beam from the light source is likely to shift due to local aging of the machine body, etc. A means to easily and accurately correct the optical axis has not yet been found. Therefore, conventional automatic leveling devices cannot avoid deterioration in survey accuracy due to such causes.

To explain this with reference to FIG. 2, the actual vertical light beam deviates from the true position 5 as shown by the broken line, and the horizontally directed light beam 7' deviates from the true position 7, making it impossible to obtain an accurate optical horizontal plane. I understand.

Next, a major drawback of the conventional automatic leveling device is that, as will be explained below, it is heavy and large, especially in the vertical direction, making it inconvenient to carry and also disadvantageous in terms of storage and management. Furthermore, since there are many component parts, skill and effort are required for assembly and adjustment, which increases manufacturing costs.

That is, in this type of automatic leveling device, the rotation of the pirism 6 must be approximately 400 to 600 rpm, so a general motor must be used at a reduced speed. Therefore, the speed is reduced by a combination of gears, a belt, and a pulley, and the prism 6 is rotated via the rotating shaft 8 as shown in FIG. 2, which causes the above-mentioned drawbacks. Furthermore, since a lead wire for energizing the light source must be provided, the number of parts increases, and the above-mentioned assembly and adjustment work and cost disadvantages are also inevitable.

(Objective) The object of the present invention is to eliminate the drawbacks of the prior art, and to provide a rotating irradiation type automatic leveling device that avoids the effects of geomagnetism and the like and has high measurement accuracy.

The next objective is to improve portability and storage by reducing the size of the machine, especially by lowering the height of the machine.

Furthermore, the next objective is to reduce the number of parts and improve the efficiency of assembly work, thereby reducing the product price.

(Summary of the Invention) The optical system in the automatic leveling device of the present invention vertically collimates the luminous flux emitted from a pendulum light source held by a flexible hanging wire through collimating lenses arranged oppositely, and corrects the optical axis. Through the means, a true vertical light beam is guided to a prism to obtain horizontally directed light, and the prism is rotated to illuminate an optical horizontal plane. This optical axis correction means was devised so that two wedge glass plates, each rotatable, were arranged side by side to enable easy and precise optical axis correction. Then, a magnetic shield is provided to avoid the influence of earth's magnetism, etc., and it is divided into a first member and a second member to improve the workability and shielding effect of assembling and removing it, as well as internal inspection, and to effectively cover the light source. The first shield member is made into a cylindrical plate shape, and the second shield member is made into a cylindrical plate shape.
The shield member is made into a sufficiently wide thin disk shape.

Next, the support base on which the light source is mounted is supported by a hanging wire to form a pendulum, and this hanging wire is made to have a predetermined length as is well known, and the emitted light beam is directed to a desired optical horizontal plane through a collimating lens, an optical axis correction means, and a rotating prism. Try to get it. The optical system was made shorter and smaller by using a ring plate-shaped flat motor to rotate the prism, which will be described later, and further improvements were made as described later to achieve the above object.

(Example) An example of such a configuration is shown in FIG. 1, in which 3 is a light source mounted on a support base 15, 12 is a collimating lens, 13 is an optical axis correction means, 14 is (three) hanging wires, Reference numeral 16 denotes a rotor section which has a pentagonal prism 6 therein and is mounted on the housing 1 via a pedestal 27, L is a known leveling device, and U is a control unit for rotating the rotor section and for energizing the light source, which will be described later. show. Here, the hanging wire 14
As is well known, the focal length of the collimating systems 3 and 12 is made longer than the focal length of the collimating systems 3 and 12 to compensate for (absorb) the bending resistance of the suspension wires, and the lens barrel holder shown in the drawing holds and maintains the lens barrel.
The optical axis correction means 13 consists of wedge glass plates 18, 18, as shown in FIG.
It can be rotated by inserting an operation pin (not shown) into the pin hole 20 and operating it. By rotating this glass plate, the vertical light beam 5' shifted by θ becomes a true vertical light beam 5.

As shown in FIG. 4, the flat motor has a cylindrical shaft 23 having a substantially inverted L-shaped cross section and supported by a rigid bearing 22 attached to a ring-shaped bearing support member 21 having a substantially horizontal T-shaped cross section fixed to the housing 1 as shown in FIG. is provided concentrically with the vertical optical beam 14. Then, a rotor magnet 24 in the form of a ring plate, which is alternately N and S polarized, is attached to the lower surface of the horizontally extending portion 23' of the cylindrical shaft 23, and the horizontally extending portion of the bearing support member 21 is attached opposite to this rotor magnet. A drive coil body 25 is provided attached to the upper surface of the existing portion 21'. This drive coil body is connected to the above-mentioned N.
A short and small salient pole is provided in a protruding manner opposite to the S pole, and an armature coil is applied to the short salient pole, or a purine wiring type coil is provided on this pole. It can be seen that such a flat motor is effective in reducing the size and weight of the device, particularly in reducing the height and number of parts, as compared to the conventional rotary drive system.

Next, the rotor part 16 has a pentagonal prism 6 installed therein as shown in FIG.
It is fixed on a ring plate-shaped pedestal 27 placed on the ring plate 3. Preferably, a moisture-proof roof body 28 is installed,
An upper engaging part 28 consisting of an uneven part is provided on the lower side of the periphery of the pedestal 27 so that it can freely slide and rotate by engaging with a lower engaging part 29 of a similar structure provided on the casing. (See figure) Used for moisture and dust proofing, and combined with the effect of the roof, it ensures that surveying work will not be hindered even in adverse environments, especially during light rain.

Also, due to the above magnetic shielding, as shown in Figure 1,
For example, a cylindrical first tube made of permalloy with a thickness of 0.2 mm.
A magnetic shielding member 30 and a removable second magnetic shielding member 31 which is similar to a disc and which is sufficiently wider than the cylindrical cross section are disposed close to the magnetic shielding member 30 so as to effectively cover the light source 3. I made it. Note that the covering function is improved by making the longitudinal section of the first shield member 30 into an inverted L shape, and by making the central part of the light source support stand 15 projecting as shown in the figure, and placing the light source above it.

In this embodiment, a cylinder-type air damper is used as a damper for the pendulum, and the inner cylinder 32 is attached to the support base 15, and the outer cylinder 33 is attached to the casing, with a gap of about 0.2 to 0.4 mm, so that the height of the device is low. Therefore, it is extended upward from the support base 15. Furthermore, by making each hanging wire 14 conductive so that the control unit U can energize the light source to emit light, the number of parts can be reduced.

Although the illustrated embodiment has been described, the present invention is not limited thereto, and includes various embodiments that can be conceived by those skilled in the art.

(Effects) As is clear from the above explanation, if the present invention is used, even if the optical axis misalignment occurs, it can be easily and accurately corrected without being affected by geomagnetism, etc.
Highly accurate automatic leveling can be performed. In addition, since the entire device is small and lightweight, and especially has a low height, it is advantageous for portability, storage, and transportation. moreover,
Since the number of component parts and assembly man-hours can be reduced, an inexpensive automatic leveling device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view of an embodiment of the present invention.
FIG. 2 is a sectional view of a conventional device of this kind. Figure 3 shows
FIG. 3 is a sectional view showing optical axis correction means used in the present invention. Fourth
The figure is also a schematic sectional view showing the flat motor. Explanation of symbols, 1: Housing, 2, 14: Suspension wire, 3:
Light source, 5: Vertical light beam, 6: Pentagonal prism,
7: Horizontal directional beam, 12: Collimating lens,
13: Optical axis correction means, 16: Rotor section, 22: Rigid bearing, 23: Cylindrical shaft, 24: Rotor magnet,
25: drive coil body, 30: first magnetic shield member, 31: second magnetic shield member, 32: inner cylinder, 33: outer cylinder.

Claims (1)

[Scope of Claims] 1. Light emitted from a light source suspended as a pendulum body is guided to a rotating pentagonal prism through a collimating lens installed opposite the light source and two wedge glass plates each rotatably arranged in parallel. In an automatic leveling device which obtains an optical plane by (a) the light source is mounted on a support horizontally suspended by several flexible hanging wires gripped by the device housing, A damper is provided for the formed pendulum body, and the hanging wire is made longer than the focal length of the collimating lens to compensate for the bending resistance, (b) the rotating pentagonal prism is installed inside the rotor part,
This rotor portion is directly rotationally driven by a flat motor in the form of a ring plate; and (d) a light source energizing means for causing the light source to emit light by supplying electricity through the suspension wire, and (d) removably attaching a second magnetic shielding member having a disc shape that is sufficiently wider than the cylindrical cross section to the housing. A rotating irradiation type automatic leveling device characterized by being equipped with. 2. In the rotary irradiation type automatic leveling device according to claim 1, the first magnetic shielding member has an inverted L-shape in longitudinal section, the light source support has a convex central part, and the light source is mounted on the upper part of the first magnetic shielding member. What I placed. 3. In the rotary irradiation type automatic leveling device as set forth in claim 1, the pendulum damper includes a cylindrical inner cylinder extending upward from the peripheral edge of the light source support base and a small portion outwardly thereof. An air damper type formed by an outer cylinder fixed to the housing with a small gap. 4. In the rotary irradiation type automatic leveling device as set forth in claim 1 or 3, the rotor portion in which the pentagonal prism is installed has a roof body mounted on the upper part and a circular shape on which the rotor portion is mounted. An upper engaging part consisting of an uneven part is provided on the lower side of the periphery of the pedestal, and a lower engaging part is provided at the upper part of the casing so as to freely slide and rotate with the upper engaging part. 5. In the rotary irradiation type automatic leveling device according to claim 1, the flat motor has a cross-section of approximately A pedestal on which the rotor part is mounted is fixed to an inverted L-shaped cylinder shaft, and ring plate-shaped rotor magnets alternately polarized in N and S are fixed on the lower surface of the horizontally extending part of the cylinder shaft, A drive coil body in the form of a ring plate is fixed to the horizontally extending portion of the cylindrical shaft in opposition to the rotor magnet. 6. In the rotary irradiation type automatic leveling device as set forth in claim 5, the ring plate-shaped drive coil body has a salient pole provided on its upper surface in a convex manner corresponding to the N or S pole of the rotor magnet. A coil formed by winding a coil or forming a printed wiring coil on the top surface of the coil body.