JPS59196411A - Level utilizing laser light - Google Patents

Abstract

PURPOSE:To obtain a projected light beam having a wide angle range, by reflecting a laser beam having a specified diameter by a plurality of cylindrical reflecting surfaces, thereby obtaining the fan shaped luminous flux. CONSTITUTION:Laser light from laser oscillator 1 is reflected by first twin mirrors comprising a Y-axis adjusting mirror 2 and an X-axis adjusting mirror 3. Then, the laser light is reflected by second twin mirrors 4 and guided to a lens system comprising a concave lens 5 and convex lens 6. The laser light inputted to an optical axis 7 is made to be luminous flux having a specified diameter (d) and inputted to a reflector 8. The reflector 8 has three cylindrical reflecting surfaces, whose reflecting angles increase as the optical axis 7 is approached. The luminous flux having the diameter (d) on the optical axis 7 is reflected on a horizontal plane and a vertical plane as fan shaped luminous fluxes, which diffused at a wide angle, respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a leveling instrument that projects a horizon directly onto an object to be surveyed using a laser beam.

<Prior Art> As a conventional leveling instrument of this type, there is a method in which a laser beam is refracted by a cylindrical lens, or a method in which a laser beam is reflected by a rotating polygonal mirror. The former has the disadvantage that the aperture angle of the beam after refraction is small, and the latter requires a rotation mechanism, making the device complex, and since the spot only runs, it is not possible to project a continuous light beam.

<Object of the Invention> The object of the present invention is to provide a leveling instrument using a laser beam that can project a continuous light beam over a wide angle, has a simple structure, and can be easily assembled and adjusted. There is a particular thing.

<Configuration of the Invention> A laser beam generation source, a concave lens that diffuses the laser beam, a convex lens disposed behind the concave lens, a cylindrical reflective surface disposed behind the convex lens,
at least two mutually orthogonal reflectors disposed between the laser light generation source and the concave lens, and one of the two reflectors is provided with an X-direction adjustment mechanism; Another feature is that a Y-direction adjustment mechanism is provided. Embodiment FIG. 1 shows a configuration diagram of an embodiment of the present invention.

The laser oscillator 1 is a He-Ne laser tube, and outputs a red visible laser beam. This laser beam is reflected by a first two-piece mirror consisting of a Y@adjustment mirror 2 and an X-axis adjustment mirror 3, then reflected by a second two-piece mirror 4 whose intersection angle is fixed at 90°, and is then reflected by a concave lens. 5 and a convex lens 6. This lens system converts laser light incident on the optical axis 7 into a beam of light having a predetermined diameter d on the optical axis 7, and makes the laser beam incident on the reflector 8 provided on the optical axis 7.

The reflector 8 has three cylindrical reflecting surfaces in which the angle of reflection increases as it approaches the optical axis 7, and as shown in FIG. As shown in Fig. 3, a beam of light having an aperture of d on the axis 7 is reflected as a fan-shaped beam of light that is diffused at a wide angle on the horizontal and vertical planes, respectively, and a horizontal and vertical beam is projected onto the photoreceptor. The width of the horizontal light emitting line and the vertical light emitting line on this photoreceptor is determined by the concave lens 5 of the lens system.
is slidably displaceable on its optical axis 7, and can be adjusted by changing the focusing point of the light beam from the lens system, so that it can be focused near the photoreceptor placed at an arbitrary distance. It is possible to project extremely sharp straight lines.

Now, in order to obtain the above-mentioned straight line, it is necessary to correctly guide the laser beam onto the optical axis 7 of the lens system, but in the present invention, this guidance is easily made possible by the mechanism described below.

FIG. 4 is an enlarged view of the first and second two mirrors that guide the laser beam from the laser oscillator 1 onto the optical axis 7 of the lens system. The first double mirror Y! The II+ adjustment mirror 2 is attached to a cylinder 21 that is rotatable on an axis perpendicular to the plane of the paper, and
The tll adjustment mirror 3 is attached to a cylindrical column 31 that is rotatable on an axis perpendicular to the upper mirror 3 column 21. Therefore, when the cylinder 21 is rotated, the intersection angle θ of the first two mirrors changes, and the cylinder 31
When rotated, the intersection line 10 of the first two mirrors is inclined. Further, the second two-piece mirror 4 has its intersection angle fixed at 90°,
Each is attached to a cylinder 41 that is slidable and rotatable on an axis parallel to the cylinder 31. Now, if the laser beam from the laser oscillator 1 is not parallel to the optical axis 7 on the paper surface of FIG. It can be made parallel by adjusting. Also, the light incident on the second two-piece mirror 4 is as shown in b, and as a result, the reflected light from the second two-piece mirror 4 is as shown in C (with respect to the optical axis 7 on the paper in Figure 4). If the two mirrors 4 are deviated in parallel, the reflected light can be moved in parallel and placed on the optical axis 7 by adjusting the second two-piece mirror 4 upward. If the light is not parallel to the optical axis 7 on the plane of FIG. 5 as shown in the plan view of the main part (d), it can be made parallel by rotating the X!Il+ adjusting mirror 3. Furthermore, as shown in FIG. 6, which is also a plan view of the main part of FIG. 4, when the light is deviated parallel to the optical axis 7 as shown in e, By adjusting the rotation of 4 as shown in the figure, the reflected light can be moved in parallel and placed on the optical axis 7.

FIG. 7 shows another embodiment of the present invention. This example is the first
The difference from the one in the figure is that two reflective mirrors 2A and 3A are provided between the laser oscillator l and the concave lens 50, one of which 2A is equipped with a Y-axis adjustment mechanism, and the other mirror 3A is provided with a Y-axis adjustment mechanism.
A is equipped with an X-axis adjustment mechanism. In this embodiment as well, the laser beam source 1 can be disposed below the optical system, and the position and angle of the central axis of the laser beam incident on the reflector 8 can be adjusted by adjusting the positions and angles of the reflectors 2Δ and 3A. Tilt angle can be adjusted.

<Effects> As explained above, according to the present invention, a laser beam having a predetermined diameter is reflected by a plurality of cylindrical reflecting surfaces to obtain a fan-shaped ray bundle. As a result, an extremely wide-angle projection beam can be obtained. Furthermore, since the fan-shaped ray bundle is obtained with the reflecting surface stationary, the projected light rays are continuous. Furthermore,
A laser beam from a laser oscillator is guided onto the optical axis of a lens system through reflection from a combination of first and second mirrors,
Since the mirror can be adjusted in a predetermined direction, there is no need to create a strict positional relationship between the laser beam emitter and the optical system.
Since the position and direction of the laser beam incident on the reflector 8 can be adjusted only by adjusting the first and second reflecting mirrors, manufacturing is facilitated, and the laser beam emitter and the optical system are connected in series. Since the device can be arranged three-dimensionally without having to be placed in the middle, the overall length of the entire device can be shortened.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention, and FIG. 2(a). (b) is a plan view and a front view of a reflector according to an embodiment of the present invention, FIG. 3 is an explanatory diagram of the function of the reflector, and FIG. The enlarged view, FIG. 5, and FIG. 6 are plan views of essential parts for explaining the operation. FIG. 7 is a configuration diagram showing another embodiment of the present invention. 1-Laser oscillator, 2.2A-Y@adjustment mirror3.
3A-X@adjustment mirror, 4-second double mirror 5-concave lens, 6-convex lens 7-optical axis of lens system, 8
- Reflector 10 - Intersection line of the first two mirrors. θ - Intersection angle of the first two mirrors Patent applicant Yasushi Ozaki Representative Patent attorney Nishi 1) Arata

Claims (2)

[Claims] (1) A laser beam generation source, a concave lens that diffuses the laser beam, a convex lens disposed behind the concave lens, a cylindrical reflective surface disposed behind the convex lens, and the laser beam generation source. It has at least two mutually orthogonal reflectors disposed between the concave lenses, one of the two reflectors is provided with an X-direction adjustment mechanism, and the other is provided with a Y-direction adjustment mechanism. A leveling instrument that uses laser light and is characterized by being equipped with an adjustment mechanism. (2) A laser beam generation source and two mirrors that reflect the laser beam, one mirror changing the intersection angle of the two mirrors, and the other mirror changing the intersection line of the two mirrors. a first two-piece mirror that is rotatably adjustable in the direction of inclination; and a two-piece mirror that reflects a laser beam reflected from the first two-piece mirror, the intersecting angle of which is fixed at a right angle. a second mirror that can be slidably adjusted in a predetermined direction on the main plane of the two-panel mirror in a state where
A two-piece mirror, a lens system that converts the light incident on the optical axis into a bundle of rays with a predetermined diameter on the optical axis, and a lens system that is installed on the optical axis of the lens system, and the angle of reflection increases as it approaches the center. and a reflecting surface formed by a plurality of cylindrical curved surfaces, and the laser beam from the laser beam generation source is directed onto the optical axis of the lens system by adjusting each of the first and second two mirrors. According to claim 1, the fan-shaped ray bundle is guided and reflected from the reflecting surface to spread out at least on a horizontal plane, so that a horizontal projected light ray is projected onto the photoreceptor. Levelless M using laser light.