JPH05280975A - Surveying equipment for forming horizontal plane - Google Patents

Abstract

PURPOSE:To project light in all directions in a horizontal plane to form a horizontal reference plane by hanging an afocal lens system having an angular magnification of 2 from a console between a collimate lens and a reflecting optic member so that an optical axis is maintained vertical. CONSTITUTION:A surveying equipment comprises a collimate lens 12 fixed to a console 10 for converting a light flux from a light source 11 into a parallel flux, a reflecting optic member 13 fixed to the console 10 for deflecting the parallel flux to project the light flux in approximately all directions in a horizontal plane, and an afocal lens system 14 located between the collimate lens 12 and the reflecting optic member 13 and hung from the console 10 to maintain an optic axis in a vertical direction G, while the afocal lens system 14 has an angular magnification of 2. When an optic axis O' of the collimate lens 12 is tilted with respect to an optic axis O (vertical line G) of the afocal lens system 14, a light beam incident to the afocal optic system 14 in parallel with the optic axis O' by an angle theta is emitted from the optic system 14 with an angle 2 theta with respect to the vertical line G. Even if the equipment is set slantly, the light flux is projected in approximately all directions in a horizontal plane.

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 horizontal plane that projects a light beam in almost all directions within a horizontal plane to form a horizontal reference plane.

[0002]

2. Description of the Related Art Conventionally, there is known a surveying instrument for forming a horizontal plane, for example, a laser irradiation type level, which disperses and projects laser light in almost all directions in a horizontal plane to form a horizontal reference plane. FIG. 1 shows an overall view of the horizontal plane forming surveying instrument. In FIG. 1, 1 is a housing, 2 is a conical reflecting optical member, 3 is a collimating lens, and 4 is a light source such as a semiconductor laser. The reflective optical member 2 is suspended by a wire 5 with its top facing downward. The collimator lens 3 and the light source 4 are fixed to the housing 1. Figure 1
Indicates that the surveying instrument for forming the horizontal plane is set horizontally, and the light flux emitted from the light source 4 is made into a parallel light flux P by the collimator lens 3, and the parallel light flux P is reflected by the reflective optical member 2 and becomes horizontal. Deflected in the direction. The parallel light beam deflected in the horizontal direction is projected in almost all directions in the horizontal plane to form the horizontal reference plane L.

As shown in FIG. 2, when the surveying instrument for forming a horizontal plane is set on the wire 5, the reflective optical member 2 is tilted by θ / 2 with respect to the vertical line G when the instrument is set at an angle θ with respect to the horizontal plane L. Is designed to be. This is because when the reflecting surface 2a of the reflecting optical member 2 is inclined by θ / 2 with respect to the vertical line G, the reflection direction is deflected by θ.

Accordingly, even when the surveying instrument for forming a horizontal plane is tilted by an angle θ with respect to the horizontal plane L, the horizontal reference plane can be formed by projecting the luminous flux in almost all directions within the horizontal plane L.

[0005]

However, when the surveying instrument for forming the horizontal plane is tilted by the angle θ with respect to the horizontal plane L, the reflection optical member 2 is tilted by the angle θ / 2 with respect to the vertical line G. Suspending the member 2 with the wire 5 requires a high level of assembly technology. In addition, since the material of the wire 5 varies, it is necessary to finely adjust the supporting length of the wire 5.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a horizontal reference plane by projecting light in almost all directions in a horizontal plane with a good precision and a simple structure. There is provided a surveying instrument for forming a horizontal surface capable of forming a horizontal plane.

[0007]

A surveying instrument for forming a horizontal plane according to the present invention includes a collimating lens fixed to a housing for converting a light beam from a light source into a parallel light beam, and a collimating lens fixed to the housing for horizontally collimating the parallel light beam. The reflective optical member for deflecting and projecting the luminous flux in almost all directions in the horizontal plane is placed between the collimating lens and the reflective optical member, and the optical axis is kept in the vertical direction. And a lowered Galileo-type afocal lens system, and the afocal lens system has a double angular magnification.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 3, reference numeral 10 is a housing of a surveying instrument for forming a horizontal surface. A laser light source 1 is provided on the lower side of the housing 10.
1. The collimator lens 12 is fixed. The collimator lens 12 plays a role of converting the light flux from the light source 11 into a parallel light flux, and emits the parallel light flux in the vertical direction. A reflective optical member 13 is fixed to the upper side of the housing 10.
The reflective optical member 13 may have a conical shape or a polygonal pyramid shape. The reflective optical member 13 plays a role of deflecting a parallel light beam incident from the vertical direction in the horizontal direction and projecting the light beam in almost all directions in a horizontal plane. A Galileo-type afocal optical system 14 is located between the collimator lens 12 and the reflective optical member 13. This afocal optical system 14
The angular magnification of is 2 times. That is, the afocal optical system 14 has an optical characteristic that a light beam that enters the optical axis O at an angle θ is emitted at an angle 2θ with respect to the optical axis O. This afocal optical system 14 is a convex lens 1.
5, the concave lens 16 and the lens holding cylinder 17 are roughly configured. The afocal optical system 14 is suspended by a wire rod 18 so that its optical axis O coincides with the vertical line G. Here, at least four wire rods 18 are used, and one end of each wire rod 18 is attached to the upper end of the lens holding cylinder 17 at a 90-degree symmetrical position in the circumferential direction as shown in FIG. Is fixed to a point Q of the upper wall 19 of the housing 10.

In this embodiment, the afocal lens system 14 is suspended by the four wire rods 18, but the afocal lens system 14 may be suspended by the three wire rods 18.

When the surveying instrument for forming a horizontal plane is set at an angle of 0 with respect to the horizontal plane L as shown in FIG.
The optical axis O ′ of the collimator lens 12 and the optical axis O of the afocal optical system 14 coincide with each other, and accordingly, the collimator lens 1
The light beam emitted in the vertical direction from 2 is guided to the reflection optical member 13 through the afocal optical system 14 in parallel with the optical axis thereof, and is deflected in the horizontal direction by the reflection surface of the reflection optical member 13 so that in the horizontal plane. It is projected in almost all directions.

Assuming that the horizontal plane forming surveying instrument is tilted at an angle θ with respect to the horizontal plane L as shown in FIG. 5 and the afocal optical system 14 is not provided, the parallel light beam P deflected in the horizontal direction. Will be projected at an angle θ with respect to the horizontal plane L. In order to project the light flux P in the horizontal direction, the light flux R may be guided to the reflective optical member 13 from the direction of the angle 2θ with respect to the vertical line G. According to the present invention, as shown in FIG. The optical axis O of the collimating lens 12 with respect to the optical axis O (vertical line G) of the optical system 14
When ′ is tilted by an angle θ, the light rays incident on the afocal optical system 14 in parallel with the optical axis O ′ are emitted from the afocal optical system 14 at an angle 2θ with respect to the vertical line G, thus forming a horizontal plane. Even if the surveying instrument is set to be inclined with respect to the horizontal, the light beam is projected in almost all directions in the horizontal plane.

[0012]

[Effect] Since the surveying instrument for forming a horizontal plane according to the present invention has the structure described above, the horizontal reference plane is formed by projecting light in almost all directions in a horizontal plane with a good precision and a simple structure. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is an overall view of a conventional horizontal plane forming surveying instrument.

FIG. 2 is an explanatory diagram when a conventional horizontal plane forming surveying instrument is tilted at an angle θ.

FIG. 3 is an overall view of a horizontal plane forming surveying instrument according to the present invention.

FIG. 4 is a plan view of an afocal optical system according to the present invention.

FIG. 5 is a diagram showing the emission direction of light rays when the afocal optical system according to the present invention is not provided.

FIG. 6 is a view for explaining the operation of the horizontal plane forming surveying instrument according to the present invention.

[Explanation of symbols]

 10 Housing 11 Laser Light Source 12 Collimating Lens 13 Reflective Optical Member 14 Afocal Optical System G Vertical Line

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Ikuo Ishinabe 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Topcon Co., Ltd. (72) Inventor Takuji Sato 75-1 Hasunuma-cho, Itabashi-ku, Tokyo Topcon Co., Ltd. Within

Claims (1)

[Claims] 1. A collimator lens fixed to a housing to convert a light flux from a light source into a parallel light flux; and a collimator lens fixed to the housing to deflect the parallel light flux in a horizontal direction to project the light flux in almost all directions in a horizontal plane. And a reflective optical member for adjusting, and a Galileo-type afocal lens system hung from the housing so as to be positioned between the collimating lens and the reflective optical member and keep the optical axis in the vertical direction. And a horizontal focal plane forming survey instrument, wherein the afocal lens system has a double angular magnification.