JPS6179176A - Optical transmission system of laser beam - Google Patents

Abstract

PURPOSE:To easily conform the projection direction and spread angle of a laser beam by providing an optical transmission system with a scale plate equipped with a reverse reflected beam generating means, optical path converting means, and lens for viewing, and viewing an image formation position on a scale plate. CONSTITUTION:A transparent glass plate 15 equipped with a corner cube reflector 16 is provided or the outside of an objective lens 14, and a beam splitter 17 is provided between an ocular lens 13 and the objective lens 14. Then, the scale plate 18 and magnifying lens 19 for viewing are provided at the focus position of the object lens 14 in the reflection direction of the beam splitter 19. Then the laser beam 12 outputted by a laser oscillator 11 is passed through the objective lens 14 and the part of it is reflected by the corner cube 16 in the opposite direction and has its optical path changed by the beam splitter 17 to form an in-focus image on the scale plate 18. Consequently, the image formation position on the scale plate 18 is viewed through the magnifying lens 19 to know the projection direction and spread angle of the laser beam 12.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a laser beam transmission optical system suitable for laser radar devices, laser aiming devices, laser communication devices, etc.

[Background of the invention]

BACKGROUND OF THE INVENTION As a laser beam transmission optical system in laser applied devices such as a laser radar device, a laser aiming device, and a laser communication device, a telescope type system having a function of converting and controlling a laser beam has been known. This telescope-type laser beam transmission optical system is composed of an objective lens and an eyepiece lens.

When converting and transmitting a laser beam using such a laser beam transmission optical system, confirmation of the laser beam emission direction, beam divergence angle, etc., is necessary by visually checking the beam pattern from a distance and checking the light intensity distribution. This is accomplished through time-consuming work such as measurement. Therefore, in laser application devices such as laser radar devices, a method for confirming the emission direction of a laser beam and its beam divergence angle has been a conventional problem.

[Purpose of the invention]

The present invention has been made in view of the problems of the prior art described above, and is capable of transmitting a laser beam that allows easy confirmation of the emission direction and spread angle of the laser beam in a laser application device such as a laser radar device. The purpose is to provide optical systems.

[Summary of the invention]

The laser beam transmission optical system of the present invention is a laser beam transmission optical system in which the laser beam is exchanged and controlled by a telescope-type eyepiece lens and an objective lens, and a part of the laser beam emitted from the objective lens is emitted. a retroreflection beam forming means that reflects in the opposite direction to form a plurality of retroreflection beams; and an optical path converter provided between the objective lens and the eyepiece to change the optical path of the plurality of reflection beams. (5) a scale plate provided on the optical axis of the plurality of retroreflected beams whose optical paths are bent by the optical path converting means and in the focal plane of the objective lens; and (5) a viewing magnifying lens for visually recognizing the scale plate. It is characterized by having the following.

[Embodiments of the invention]

The present invention will be described in more detail below with reference to embodiments shown in the accompanying drawings.

FIG. 1 is a diagram showing an embodiment of the present invention. In the figure, a laser beam 12 output from a laser oscillator 11
is emitted by a Galilean telescope consisting of an eyepiece lens 13 and an objective lens 14, after the beam diameter is enlarged and the divergence angle is controlled. A conventional laser beam transmission optical system consists only of a laser oscillator II, an eyepiece lens 13, and an objective lens 14. However, in this embodiment, as shown in the figure, a transparent glass plate 15 equipped with a corner cube reflector 16 is provided outside the objective lens 14, and a beam splitter 17 is provided between the eyepiece lens 13 and the objective lens 14. ing. In the reflection direction of the beam splitter 17 and at the focal position of the objective lens 14, a scale plate 1 is provided.
8 is provided, and a viewing magnifying lens 19 is provided beyond that. FIG. 2 is a diagram showing the appearance of the corner cube reflector 16.

Corner cube reflectors 16 are attached to the transparent glass plate 15 with their reflective surfaces facing the objective lens 14, and are arranged at equal intervals in a cross shape in the radial direction of the laser beam, as shown in FIG. Therefore, a portion of the laser beam emitted from the objective lens 14 is reflected by the corner cube reflector 16 in a direction opposite to the direction in which the laser beam is emitted. After passing through the objective lens 14, the retroreflected beam is reflected by a beam splitter 17 and is imaged onto a scale plate 18 placed at the focal plane of the objective lens 14.

If the divergence angle of the laser beam is controlled by the Galilean telescope so that the laser beam emitted from the objective lens 14 becomes a parallel beam, all the retroreflected beams from the corner cube reflectors 16 will be reflected from the scale plate 18. The light is focused and imaged on one point.

When the laser beam emitted from the objective lens 14 is emitted with a divergence angle θ, the corner cube reflector 1
The retroreflected beam of No. 6 is located at the center of the beam (
The light is focused at a position f·θ (where f is the focal length of the objective lens) from the optical axis).

Therefore, by confirming the image formation position on the scale plate 18 through the viewing magnifying lens 19, the emission direction and spread angle of the laser beam can be easily determined.

〔Effect of the invention〕

According to the present invention, it is possible to easily determine the emission direction and spread angle of a laser beam without having to take troublesome measures such as visually checking the beam pattern from a distance or measuring the light intensity distribution. Therefore, by applying the present invention to laser application devices such as laser radar devices, laser aiming devices, and transmission optical systems of laser communication devices, it is possible to significantly improve performance such as pointing accuracy and functions such as operability.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the external appearance of the corner cube reflector shown in FIG. 1, and FIG. 3 is a transparent glass plate of the corner cube reflector shown in FIG. 1. FIG. 4, a diagram showing the upper arrangement, is a diagram showing an example of visual recognition of the scale plate shown in FIG. 1. 11... Laser oscillator, 12... Laser beam, 1
3... Eyepiece lens, 14... Objective lens, 15...
・Transparent glass plate, 16... Corner cube reflector, 1
7...Beam splitter, 18...Scale plate, 19.
...Magnifying lens for viewing. Representative Patent Attorney Tadashi Akimoto Figure 1 21 31 1

Claims (1)

[Claims] 1. In a laser beam transmission optical system in which a laser beam is exchanged and controlled by a telescope-type eyepiece and an objective lens, a part of the laser beam emitted from the objective lens is directed in the opposite direction to the laser beam emission direction. a retroreflection beam forming means for reflecting in a direction to form a plurality of retroreflection beams; an optical path changing means provided between an eyepiece and an objective lens for changing the optical path of the plurality of retroreflection beams; A scale plate provided on the optical axis of the plurality of retroreflected beams whose optical paths are bent by the optical path converting means and at the focal plane of the objective lens, and a viewing magnifying lens for visually recognizing the scale plate. A laser beam transmission optical system characterized by: 2. The retroreflection beam forming means is composed of a transparent glass plate placed outside the objective lens, and a plurality of reflectors affixed to the transparent glass plate with their reflective surfaces facing toward the objective lens. A laser beam transmission optical system according to claim 1, characterized in that: 3. The laser beam transmission optical system according to claim 2, wherein the reflector is a corner cube reflector. 4. The laser beam transmission optical system according to claim 1, wherein the optical path converting means is a beam splitter. 5. The laser beam transmission optical system according to claim 2, wherein the reflectors are arranged in a cross shape on a transparent glass plate at regular intervals.