JPH05280976A - Surveying equipment for forming reference plane - Google Patents

Abstract

PURPOSE:To provide a surveying equipment for forming a reference plane wherein a structure is relatively simple, adjustment of fluctuation is easy and an approximately horizontal reference plane can be formed correctly with respect to a slope of a case. CONSTITUTION:A surveying equipment for forming a reference plane comprises a mirror 11 and a light source part 14 supported by a case, while the case is provided with a line member 17 for tilting a collimate lens 15 so that when a center axis 12 of the mirror 11 is directed to a vertical direction, the center axis 12 and an optic axis 16 overlap while when the center axis 12 of the mirror 11 is titled, the optic axis 16 is in parallel with the center axis 12, and the collimate lens 15 is hung at an effective length of a focal distance of the collimate lens 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surveying instrument for forming a reference plane which emits light in almost all directions in a horizontal plane to form a horizontal reference plane.

[0002]

2. Description of the Related Art Conventionally, as a surveying instrument for forming a reference plane, levels shown in FIGS. 3 and 4 are known.

At the level shown in FIG. 3, a light source 2 for laser light is arranged at the bottom of a level housing 1, and a collimating lens 3 is fixed above the light source 2. The light source 2 is located on the optical axis of the collimator lens 3. The distance between the collimator lens 3 and the light source 2 is the focal length of the collimator lens 3, and the light from the light source 2 is collimated by the collimator lens 3. Above the collimator lens 3, a conical mirror 4 with the apex angle facing downward is disposed. The mirror 4 is suspended by a suspension member 5 suspended from the housing 1, and the apex angle portion of the mirror 4 is located on the optical axis of the collimator lens 3. The reflecting surface of the mirror 4 has an angle of 45 ° with respect to the vertical line. The suspension member 5 is devised so that when the housing 1 is inclined by θ with respect to the horizontal plane 6, the mirror 4 is inclined by θ / 2 with respect to the vertical line 7.

At this level, as shown in FIG. 4, when the housing 1 is inclined by θ with respect to the horizontal plane 6, the light source 2 and the collimator lens 3 are also inclined by θ with respect to the vertical line 7, and the parallel light flux of the collimator lens 3 is Incline θ with respect to the vertical line. On the other hand, the mirror 4 is attached to the vertical line 7 by the suspension member 5 described above.
The angle of incidence of the parallel light flux of the collimated lens 3 that is inclined is incident on the reflecting surface of the mirror 4 that is inclined is larger than the angle of incidence when not inclined by θ.
It decreases by / 2. When the incident angle of incident light with respect to the mirror is α, when only the mirror is inclined by θ / 2 in the direction of decreasing the incident angle of incident light, the reflection angle of the light is α with respect to the surface of the original mirror. Is decreased by θ.

Therefore, when the mirror 4 is rotated by θ / 2, if the incident angle θ is further increased with respect to the original incident angle of the incident light, the reflected light is rotated by the original angle before the rotation. Therefore, the laser light can be emitted in almost all directions in the horizontal plane.

[0006]

However, in such a conventional reference plane forming surveying instrument, when the housing 1 is inclined by θ with respect to the horizontal plane 6, the mirror 4 is accurately inclined by θ / 2. There is a problem that the structure of the suspension member 5 becomes complicated, a high-level assembly technique is required, and the suspension member 5 of the mirror 4 has variations in materials and the like, so that it is troublesome to adjust the suspension member 5.

[0007]

SUMMARY OF THE INVENTION Therefore, the present invention is a surveying instrument for forming a reference plane, which has a relatively simple structure and is easy to adjust the variation, and can accurately follow the inclination of the housing to form a substantially horizontal reference plane. The purpose is to provide an instrument.

[0008]

In order to solve the above-mentioned problems, a surveying instrument for forming a reference plane according to the present invention makes a light beam inclined at 45 ° to the central axis and parallel to the central axis at right angles to the central axis. A reflecting member having a radiable reflecting surface; and a light source section disposed on a central axis of the reflecting member and facing the apex angle section of the reflecting surface, the light source section and the reflecting member. In a surveying instrument for forming a reference plane, in which a collimating lens for collimating the light from the light source unit to make it enter the reflecting surface of the reflecting member is provided between the collimating lens and the effective length of the focal length of the collimating lens. It is characterized by being suspended by the sea.

[0009]

According to the surveying instrument for forming the reference surface of the present invention, the collimating lens is simply suspended.
The horizontal reference plane can be accurately formed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A surveying instrument for forming a reference plane according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a main structure of a level as a surveying instrument for forming a reference plane according to the present embodiment. 10a is an upper wall surface of the level housing and 10b is a lower wall surface of the housing. When the housing is vertically oriented, the upper wall surface 10a is oriented horizontally.

A conical mirror 11 is fixed to the upper part of the housing. A central axis 12 passes through the apex portion of the mirror 11, and the central axis 12 is perpendicular to the upper wall surface 10a. Although the mirror 11 is a conical mirror in this embodiment, it may have a regular polygonal cone shape, a truncated cone shape, a regular polygonal truncated cone shape, or a prism. The mirror 11 has a reflecting surface 13 having a cross-sectional shape at an angle of 45 ° with respect to the central axis 12. Central axis 1 passing through the apex of mirror 11
The center of the light source unit 14 is located below 2.

A collimator lens 15 is horizontally suspended between the light source section 14 and the mirror 11.

The tilting mechanism for suspending the collimator lens 15 is composed of a linear member 17 such as a cord or wire which is soft and difficult to extend. The linear member 17 is suspended from the upper wall surface 10a so as to be freely tiltable. Wire member 17
Is an effective length L that suspends the collimator lens 15 from the upper wall surface 10a of the housing.
Is set equal to. The places where the collimator lens 15 is suspended are set at 4 to 5 places so as to tilt parallel to the upper wall surface 10a of the housing.
It suffices to suspend a portion that is necessary and sufficient for making 5 follow the inclination of the upper wall surface 10a.

The distance between the collimator lens 15 and the light source unit 14 is set to be equal to the focal length F of the collimator lens 15 in the state where the housing is erected and the collimator lens 15 is horizontal. Is emitted as a parallel light flux by the collimator lens 15.

Next, with reference to FIG. 2, it will be described that the reflected light of the mirror is radially reflected toward the horizontal reference plane when the level in this embodiment is inclined.

At the level according to this embodiment, when the optical axis 16 of the collimating lens 15 extends in the vertical direction, the light source section 14 is located on the optical axis 16 of the collimating lens 15, and the central axis 12 of the mirror 11 is located. Is a collimating lens 1
5 is located on the optical axis 16 and the vertical line 18, and the reflecting surface 13 of the mirror 11 has an angle of 45 ° with respect to the central axis 12.

When the housing is tilted by θ with respect to the vertical line 18 from this state, the central axis 12 of the light source section 14 and the mirror 11 fixed to the housing is tilted by θ with respect to the vertical line 18, and the optical axis of the collimating lens 15 is increased. The center 15a is laterally displaced from the center axis 12 at a distance A.

By the way, the distance A at which the light source unit 14 is displaced from the optical axis 16 of the collimator lens 15 is A = Ltan θ =
Ftan θ, and if θ is a small amount, A≈Fθ. Therefore, the angle θ ′ formed by the optical axis passing through the optical center 15a of the collimator lens 15 and the central axis 12 is equal to θ, and the parallel light flux emitted from the collimator lens 15 is the vertical line 18
With respect to θ + θ ′ = 2θ, the reflection surface 13 of the mirror 11 is inclined.
Will be incident on.

On the other hand, the reflecting surface 13 of the mirror 11 is inclined by θ with respect to the vertical line 18 due to the inclination of the housing, and the reflected light 19 after the inclination of the housing is reflected in the horizontal direction due to the offset of the angle. Become.

Therefore, according to the level of this embodiment, even if the housing is tilted, the central axis 12 of the mirror 11 remains in the horizontal reference plane.
Since it is possible to radiate the reflected light that is horizontal in almost all directions centering around, the accurate horizontal reference plane can be obtained based on the angle of this reflected light.

In addition, since the collimator lens 12 is suspended by the linear member 17, the followability is good, the configuration is simple, the assembly is labor-free, and the possibility of failure is small.

In this embodiment, the collimator lens 12 is suspended by four linear members. However, as shown by the broken line in FIG. 2, the collimator lens 12 has three or four fulcrums as a fulcrum. You may suspend by a linear member. In that case, the effective length of suspension is the distance L between the lens optical center 15a and 18a.
Will be the length of.

Further, in this embodiment, the collimating lens 1
Although 2 is hung from the upper wall surface 10a of the housing, the collimator lens 12 may be supported by a parallel link mechanism or the like with the vertical direction reversed.

[0025]

As described above, the surveying instrument for forming a reference plane according to the present invention has a reflection surface which is inclined by 45 ° with respect to the central axis and which can emit light parallel to the central axis at a right angle from the central axis. A member and a light source unit disposed on the central axis of the reflecting member at a position facing the apex portion of the reflecting surface, and between the light source unit and the reflecting member, from the light source unit. In a surveying instrument for forming a reference surface, which is provided with a collimator lens for making the light of the above into a parallel light flux and incident on the reflecting surface of the reflecting member, since the collimator lens is suspended at the effective length of the focal length of the collimator lens, It is relatively simple and easy to adjust the variation, and moreover, it is possible to accurately and quickly follow the inclination of the housing to form a substantially horizontal reference plane.

[Brief description of drawings]

FIG. 1 is a block diagram of a surveying instrument for forming a reference plane according to an embodiment of the present invention.

2 is an explanatory view of a state in which the surveying instrument for forming the reference plane according to FIG. 1 is tilted. FIG.

FIG. 3 is a block diagram of a conventional surveying instrument for forming a reference plane.

FIG. 4 is an explanatory view when a conventional surveying instrument for forming a reference plane is tilted.

[Explanation of symbols]

 10a ... Upper wall surface of housing 10b ... Lower wall surface of housing 11 ... Mirror 12 ... Center axis 13 ... Reflecting surface 14 ... Light source section 15 ... Collimating lens 16 ... Optical axis of collimating lens 17 ... Linear member L ... Effective of linear member Length F ... Focal length of collimating lens

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ikuo Ishinabe 75-1 Hasunumacho, Itabashi-ku, Tokyo Topcon Co., Ltd.

Claims (1)

[Claims] 1. A reflecting member having a reflecting surface inclined at 45 ° to the central axis and capable of radiating light parallel to the central axis at a right angle from the central axis, and a reflecting surface on the central axis of the reflecting member. A light source portion disposed at a position facing the apex portion, and between the light source portion and the reflecting member, the light from the light source portion is made into a parallel light flux and is incident on the reflecting surface of the reflecting member. A surveying instrument for forming a reference plane, comprising a collimating lens, wherein the collimating lens is suspended by an effective length of a focal length of the collimating lens.