JPS5852545Y2 - light wave distance meter - Google Patents

Description

[Detailed description of the invention] The invention consists of an optical distance meter, more specifically, an objective lens, a light emitting system provided on one side of the optical axis of the objective lens, a light receiving system provided on the other side, and a light emitting system. An optical member having a first reflecting surface for reflecting a portion of the luminous flux from the objective lens toward the objective lens and a second reflecting surface for reflecting a portion of the luminous flux from the objective lens toward the light receiving system. The present invention relates to a light wave distance meter that forms a distance optical path.

The light wave distance meter measures the distance by measuring the phase difference between the distance measuring light passing through the distance measuring light optical path and the reference light which is substantially directly incident on the light receiving system from the light emitting system. The distance meter must be provided with a reference light optical path separate from the above-mentioned distance measurement yt and optical path.

The distance measuring light optical path and the reference light optical path must not only be formed so that the reference light and the distance measuring light do not interfere with each other, but also the optical system as a whole must be compact and easy to assemble and adjust. This is required.

The present invention was developed in consideration of the above-mentioned requirements for a light wave distance meter, and the reference light and distance measuring light do not interfere with each other, and the optical system as a whole is compact and easy to assemble and adjust. The purpose is to provide a total

The structural features of the present invention that achieve the above are: an objective lens, a light emitting system provided on one side of the optical axis of the objective lens, a light receiving system provided on the other side, and a light emitting system. an optical member having a first reflecting surface for reflecting a portion of the luminous flux from the objective lens toward the objective lens; and a second reflecting surface for reflecting a portion of the luminous flux from the objective lens toward the light receiving system. In an optical distance meter that forms a distance measuring optical path, a reference optical path for guiding a light beam from a light emitting element to a light receiving element is provided on the opposite side of the objective lens across the definition plane.

Hereinafter, an embodiment of the present invention will be explained with reference to the drawings. In FIG. 1, reference numeral 1 denotes an objective lens having an optical axis 2;
A light emitting element 3 such as a light emitting diode is arranged on one side, and a light receiving element 4 is arranged on the opposite side.

Two reflective surfaces 5a are provided between the light emitting element 3 and the light receiving element 4 so as to be located on the optical axis 2.

A prism 5 having 5b is arranged.

The intersection angle α of the reflective surfaces 5a and 5b is smaller than 900 degrees, and the reflective surfaces 5a and 5b are arranged so that the intersection angle α is divided into three equal parts by the optical axis 2.

In this example, the angle α is 80°.

The light beam from the light emitting element 3 is reflected by the reflective surface 5a, and a part of it passes through the objective lens 1 and follows the optical path 3a parallel to the optical axis 2.
emits along.

Furthermore, the light flux incident on the objective lens 1 along the optical path 4a is
The light is reflected by the reflective surface 5b and enters the light receiving element 4.

A lens system 6 forming a reference XX path is arranged behind the prism 5.

This lens system 6 reflects the light from the light emitting element that is incident on the lens 6b along the optical path 3b at the reflective surface 6a,
The light is emitted from the lens 6c and directed toward the light receiving element along the optical path 4b.

FIG. 2 shows another embodiment of the present invention, in which the prism 5
A lens system 16 is arranged laterally behind the light emitting element 1.
A part of the emitted light 15 from the lens system 16 is used as reference light.
The light then enters the light receiving element 14.

In this invention, by forming the reference light optical path behind the reflective optical member that forms the distance measurement light optical path, there is no possibility that the reference light optical path and the distance measurement light optical path will interfere with each other, and the simple structure makes it compact. A light wave distance meter can be obtained.

This not only prevents loss of light intensity of the distance measuring light, but also
This also has great advantages in terms of assembly and adjustment.

[Brief explanation of drawings]

FIG. 1 is a diagram of an optical system of a light wave distance meter showing one embodiment of the present invention, and FIG. 2 is a diagram showing another embodiment. 1...Objective lens, 3...Light emitting element,
4... Light receiving element, 5 a s 5 b...
... Reflective surface, 6... Lens system.

Claims (1)

[Claims for Utility Model Registration] An objective lens, a light emitting system provided on one side of the objective lens 9 axis, a light receiving system provided on the other side, and a part of the luminous flux from the light emitting system is transmitted to the objective lens. A light wave distance forming a distance measuring light optical path by an optical member having a first reflecting surface for reflecting toward the object lens and a second reflecting surface for reflecting a part of the light beam from the objective lens toward the light receiving system. A light wave distance meter characterized in that a reference optical path for guiding a light beam from a light emitting element to a light receiving element is provided on the opposite side of the objective lens across the definition plane.