JPS61205818A - Rotary irradiation type automatic leveling apparatus - Google Patents

Abstract

PURPOSE:To enable automatic leveling with high measuring accuracy, by providing a first cylindrical plate shaped magnetic shield member, a second disc shaped magnetic shield member and a light source energizing means. CONSTITUTION:The luminous flux from a beam source is passed through a collimation lens 12 to be made parallel in a vertical direction and passed through an optical axis correction means 13, which is constituted by providing two rotatable wedge glass plates in parallel and can easily and precisely correct an optical axis,to be converted to a real vertical beam 5 which is, in turn, guided to a prism to obtain horizontally directed beam 7 while said prism is rotated to irradiate an optically horizontal surface with said beam 7. A magnetic shield 2 is divided into two shield members in order to improve sealing effect and the first shield member 30 is formed into a cylindrical plate shape so as to effectively cover the light shield 3 while the second shield member 31 is formed into a thin disc shape. Next, the support stand having the light source 3 mounted thereto is supported by a hanging wire 14 to form a pendulum body and emitted beam is passed through the lens 12, the correction means 13 and the rotary prism to make it possible to obtain an accurate optically horizontal surface for automatic leveling.

Description

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

(Prior Art) Various types of automatic leveling devices of this type are available for general civil engineering and construction work.

The outline of a typical configuration is shown in FIG. 2. (Apparatus) A vertical light beam 5 is emitted from an optical system 4 including a light source, at least a part of which is suspended by a flexible suspension line 2 suspended from a housing 1. teeth,
It becomes a horizontally directed light beam 7 through a directional prism 6 or a rotating mirror, and a deceleration unit drives a rotating shaft 8 attached to the prism 6.
As the mechanical motor 9 rotates, a desired optical horizontal plane is created. Reference numerals 10 and 11 denote a brake plate provided on the optical system to prevent 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 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. For this reason, conventional automatic leveling devices that use the gravity acting on the pendulum body to operate the automatic leveling function are subject to the gravitational force of the earth's magnetism in addition to the earth's gravitational force, which interferes with the original automatic leveling function. Become.

By the way, the strength of this geomagnetic field has a horizontal component of 0.3 in the Okinawa region.
5 Gauss, and in Hokkaido it is 0.26 Gauss,
There are even greater differences between the equatorial region and the North or South Pole regions. Therefore, it becomes impossible to ignore the influence that the local geomagnetic strength axes and other various external magnetic fields have on level measurements, which causes a decline in surveying accuracy.

However, conventional automatic leveling devices are not designed in consideration of the effects of geomagnetism and the like. In addition, slight differences in precision IffJl due to precision assembly and adjustment of optical systems, etc. are unavoidable, and deviations in the optical axis of the emitted beam from the light source are likely to occur due to local deformation over time of the machine body, etc. A means for easily and accurately correcting such an optical axis has not yet been found. Therefore, the conventional automatic level VtI cannot avoid deterioration in measurement accuracy due to such causes.

To explain this with reference to FIG. 2, the actual vertical light beam deviates from the true position W17 as shown by the broken line, and the horizontally directed light beam 7' deviates from the true position W17, making it impossible to obtain an accurate optical horizontal plane. I understand.

Next, there is a major drawback of conventional automatic leveling devices, as explained below! ! ! It is heavy and large, especially vertically long, making it inconvenient to carry and also disadvantageous in terms of storage management. Furthermore, since there are many component parts, it is easy to assemble! l! First, it requires skill and labor, which increases production costs.

That is, in this type of automatic leveling device, the rotation of the prism 6 is 40 degrees.
0 to 6 Go r, p, must be kept at a level of about 0 to 6 Go, 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 at the same time, the above-mentioned assembly and adjustment work and cost disadvantages are inevitable.

(Purpose) The purpose of the present invention is to eliminate the drawbacks of the prior art, and to provide a rotating irradiation type automatic leveling R system that avoids the effects of geomagnetism 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 front axis correction means was devised to enable easy and precise optical axis correction by installing two wedge glass plates in parallel, each of which can be rotated in a U direction. 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 shaped like a cylindrical plate, and the second shield member is shaped like a sufficiently wide base disk.

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-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.
The second is a collimating lens, 13 is an optical axis correction means, 14 is (three) suspension rings, 16 is a pentagonal prism 6 installed inside, and is mounted on the housing 1 via a pedestal 27. L is a known leveling device, and U is a rotor unit for rotation and light source energization, which will be described later. ll1ll unit is shown. Here, the hanging Jg14 is connected to the collimated system (3,
It is made longer than the second focal length to compensate for (absorb) the bending resistance of the suspension wire, and is grasped and maintained by the illustrated holder.

The optical axis correction means 13 includes a wedge glass plate 18 as shown in FIG.
18, each glass plate is placed in a holding frame 19, and can be rotated by inserting an operating bottle (not shown) into a bottle 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 an approximately inverted cross-section that is supported by a vertical bearing 22 attached to a ring-shaped bearing support member 21 having an approximately horizontal cross-section fixed to the casing 1 with vertical light. It is provided concentrically with the heam 14. Then alternately N-3
The far north ring plate-shaped rotor magnet 24 is connected to the cylindrical shaft 23.
A drive coil body 25 is attached to the lower surface of the horizontally extending portion 23' of the bearing support member 21, and is attached to the upper surface of the horizontally extending portion 21' of the bearing support member 21, facing the rotor magnet. This drive coil body is formed by protruding short and small salient poles from a ring plate-shaped yoke facing the N·Sl, and providing an armature coil or a prin-wiring type coil on the short salient poles. 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. Preferably, a moisture-proof roof body 28 is mounted on top, and an upper engaging portion 28 consisting of a concave and convex portion is provided on the lower side of the pedestal 271ffi, and engages with a lower engaging portion 29 of a similar structure provided on the casing. It is designed to be able to slide and rotate freely (see Figure 1) 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.

In addition, for the above-mentioned magnetic shielding, as shown in FIG. 1, a cylindrical first magnetic shielding member 30 made of permalloy having a thickness of 0.2 gm, for example, and a removable magnetic shielding member 30 that is close to this and sufficiently wider than the cylindrical cross section are provided. Similarly, a disk-shaped second magnetic shield member 31 is disposed to effectively cover the light source 3. Note that the covering function is improved by making the longitudinal section of the first shield member 30 in an inverted 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.

As a damper for the pendulum body, in this embodiment, an air damper with a set of cylinders is used, and the inner cylinder 32 is mounted on the support base 15.
Attach the outer cylinder 33 to the housing and set its rim to 0.
．． The length is about 2 to 0.4 m, and it extends upward from the support base 15 in order to reduce the height of the device. Furthermore, each hanging wire 14
If the light source is made conductive and the control unit U energizes 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 occur to those skilled in the art.

(Effects) As is clear from the above explanation, if the present invention is used, even if optical axis misalignment occurs, it can be easily and accurately corrected without being affected by geomagnetism, etc. is#R degree 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. Furthermore, since the number of component parts and the number of assembly steps can be reduced, an inexpensive 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 type. FIG. 3 is a sectional view showing the optical axis correction means used in the present invention. FIG. 4 is a schematic sectional view similarly showing the flat motor. Explanation of symbols 1: Housing 2, 14: Hanging wire 3: Light source 5: Vertical light beam 6: Pentagonal prism 7: Horizontal directional beam 2nd: Collimating lens 13: Optical axis correction means 16: Rotor section 22: Rigid bearing 23 : Cylindrical shaft 24: Rotor magnet 25: Drive coil body 32: Inner cylinder 33: Outer cylinder Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] 1) Light emitted from a light source suspended as a pendulum 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 is designed to obtain an optical plane by: a) mounting the light source 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, and b) the rotating pentagonal prism is installed inside the rotor part, and the rotor part is directly rotationally driven by a flat motor in the form of a ring plate, and c) a first magnetic shield member in the form of a cylindrical plate and a first magnetic shielding member in the form of a cylindrical plate so as to cover the light source, and a first magnetic shield member in the vicinity thereof and traversing the cylinder. A second magnetic shielding member having a disk shape that is sufficiently wider than the surface thereof is removably attached to the housing, and d) a light source energizing means that causes the light source to emit light by applying electricity through the hanging wire is provided. A rotating irradiation type automatic leveling device. 2) In the rotary irradiation type automatic leveling device according to claim 1, the first magnetic shield member has a longitudinal section inverted L.
A light source support stand with a protruding central part and a light source placed on top of it. 3) In the rotary irradiation type automatic leveling device according to claim 1, the pendulum damper includes a cylindrical inner cylinder extending upward from the peripheral edge of the light source support base and an outer side thereof. An air damper type formed with an outer cylinder fixed to the housing with a small gap. 4) In the rotary irradiation type automatic leveling device according to claim 1 or 3, the rotor portion having the pentagonal prism therein 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 the inverted L-shaped cylinder shaft, and ring plate-shaped rotor magnets with north and south poles are alternately fixed to 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 magnet. 6) In the rotary irradiation type automatic leveling device according to claim 5, the ring plate-shaped drive coil body has a salient pole protruding from its upper surface 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.