JPH0432967B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a laser surveying machine configured to scan a laser beam emitted toward a surveying object in a horizontal plane or emit it in a vertical direction.

Conventionally, leveling has been carried out by emitting a laser beam that is scanned in a horizontal plane toward the object to be surveyed, and detecting the height of the position of the laser beam on the object to be measured with the naked eye of the surveyor or photoelectrically. Laser surveying machines are known that are used to set a reference point on the ground in the vertical direction by directing a laser beam in the vertical direction. In this case, the laser beam must always be scanned in a true horizontal plane or directed in the vertical direction, so careful adjustments must be made when installing the main body of the machine.

For this reason, a laser surveying machine has been proposed that incorporates an automatic correction mechanism that directs the laser beam in a fixed direction even when the machine body is tilted.

As one of this type of laser surveying machine, a laser light emitting tube with the laser light emission surface at the bottom end is suspended from the machine body, so that the laser light emission direction is directed vertically, and a rotating reflecting member is installed below. There are known devices configured to scan a horizontal plane or direct the laser beam directly in the vertical direction.

However, with such a configuration, the laser light emitted from the laser tube has extremely high directionality, so in order to always direct the laser light vertically downward, the laser tube must be suspended with a pair of hanging wires. Furthermore, this suspended body must be suspended by another pair of hanging wires disposed at right angles, resulting in a mechanically complicated process. Furthermore, in order to firmly suspend a relatively heavy laser emitting tube, it is necessary to increase the size of the machine body.

Another conventional example is to use a semiconductor laser instead of a laser arc tube, suspend a projection lens to convert the laser light emitted downward from the semiconductor laser into a parallel beam, and A device is known in which the laser beam is directed vertically downward in a straight line and is configured to be scanned in a horizontal plane by a rotating pentaprism.

However, with this configuration, the laser beam is emitted downward, so when leveling is performed by scanning with a rotating pentaprism, the horizontally directed laser beam is blocked by the frame of the machine body. As a result, there was a risk that survey accuracy in a particular direction would decrease or surveying would become impossible.

The present invention was made in order to solve these conventional problems, and it is possible to always scan a laser beam emitted toward a surveying object within a true horizontal plane regardless of the state of the machine body. To provide a laser surveying machine which can be directed in a true vertical direction and has a simple configuration.

Hereinafter, the present invention will be explained based on the drawings.

A machine body 1 is installed on an adjustable base 2, and a mounting frame 3 is fixed within this machine body 1. A hood 5 is provided approximately in the center above the bottom plate 4 of the mounting frame 3, and a hood 5 made of a conductive material is supported at three points from the bottom surface of the top plate 6 of the mounting frame 3. A book suspension line 7 is suspended. Further, a suspension stand 8 is supported at the lower end of the hanging line 7, and the hanging line 7 and the hanging stand 8 constitute a hanging member. This hanging platform 8
A semiconductor laser 9 that emits a diverging laser beam upward is attached approximately in the center of the laser beam. Note that power for operating this semiconductor laser 9 is supplied via a hanging wire 7, and a battery 10 serving as the power source is stored in a housing 11 located below the bottom plate 4.
It is stored in.

A lens holder 13 that is vertically adjustable and holds a projection lens 12 is attached to approximately the center of the top plate 6 of the mounting frame 3, and a parallel plane glass 14 for adjustment is mounted below the lens holder 13. A holding frame 15 is attached. In this case, the projection lens 12 is adjusted so that the semiconductor laser 9 is located at a focal length position vertically below the projection lens 12, and the laser light from the semiconductor laser 9 is emitted upward as a parallel beam.

On the other hand, a bearing 16 is provided in the upper part of the machine body 1, and a rotating shaft 18 to which a pulley 17 is attached is mounted on the bearing 16. A belt 21 that is wound around a pulley 20 that is pivotally attached to a motor 19 is stretched around the pulley 17, and as a result, the rotating shaft 18 is rotationally driven. Furthermore, a prism house 23 to which a pentagonal prism 22 constituting a rotational reflection member is fixed is attached to the upper end of the rotating shaft 18 so as to be easily attachable and detachable. Note that the prism house 23 is formed with an exit window 24, from which the laser light reflected by the pentaprism 22 is directly emitted toward the surveying object.

In this way, the semiconductor laser 9 is connected to the three hanging wires 7.
Since it is suspended by a suspension member consisting of a and a suspension stand 8, the light emitting part is positioned vertically below the center of the projection lens 12 and at the focal point position of the projection lens 12, regardless of whether or not the machine body 1 is tilted. It will be done. As a result, among the light beams divergently emitted by the semiconductor laser 9, the light beams made into a parallel light beam by the projection lens 12 are truly directed in the vertical direction. Therefore, even if the machine body 1 is tilted, the laser light emitted from the exit window 24 will always be scanned within a true horizontal plane as the pentaprism 22 rotates.

In addition, when the prism house 23 is removed, it functions as a surveying machine used to direct a laser beam in the vertical direction and to move and set a reference point on the ground in the vertical direction.

As explained above, according to the present invention, the semiconductor laser is placed at a focal length position vertically below the projection lens, and the semiconductor laser is suspended so that the laser beam is always directed vertically upward. Regardless of the inclination of the machine body, scanning in a horizontal plane or pointing in the vertical direction can be performed at all times, and especially when scanning in a horizontal plane, it is possible to scan in any direction without being obstructed by the frame of the machine body. Since a constant measurement light can be obtained at all times, the measurement accuracy can also be maintained at a constant and high level. Moreover, the overall configuration is simple.

[Brief explanation of drawings]

The figure is a longitudinal sectional view illustrating a laser surveying machine according to the present invention. {7...suspension line, 8...suspension stand}suspension member, 9...
...Semiconductor laser, 12...Projection lens.

Claims (1)

[Scope of Claims] 1. A semiconductor laser provided in a main body to emit a laser beam, a projection lens for turning the laser beam from the semiconductor laser into a substantially parallel beam and directing it upward, and a vertically downward direction of the projection lens. a suspension member suspended from the main body so as to hold the semiconductor laser so that the semiconductor laser is always positioned at the focal position of the laser surveying machine. 2. Claim 1, wherein the suspension member includes three suspension lines each having one end supported by the main body, and a suspension base supported at the other end of the suspension line. The laser surveying machine described. 3. The laser surveying machine according to claim 2, wherein at least one of the three hanging wires is made of a conductive material.