JPS5999273A - Guidance control over moving body and scanning method of light beam for information transmission - Google Patents

Abstract

PURPOSE:To obtain a guidance controlling method of a moving body which causes no decrease in beam intensity by splitting a light beam which is emitted from a single beam generator into plural beams, and scanning those light beams on the route of the moving body. CONSTITUTION:The laser beam generator 1 and a rotary mirror 2 rotated by a motor 3 are provided, and plural half-mirrors 4a-4c and reflecting mirrors 5a- 5c are placed between the both 1 and 2. A half-mirror 6 and a detector 7 are provided for a scanning means, and the directional laser beam emitted by the single laser beam generator 1 is split by the half-mirror 4a and reflecting mirror 5a into two parallel laser beams, which are further split by the next half-mirror 4b and reflecting mirror 5c. Consequantly, four parallel beams are incident to the automatic mirror 2 and scan on the route of the moving path through the half-mirror 6.

Description

Detailed Description of the Invention A8 Technical Field of the Invention This invention provides guidance and control for, for example, a moving body running on a floor.
Or it relates to a method of scanning a light beam used to transmit information thereto.

b. Prior Art and Disadvantages Recently, methods have been proposed for guiding and controlling the moving object or transmitting information to the moving object by scanning a light beam along the traveling route of the moving object.

However, since the diameter of the scanned light beam is small (1), a detector placed on the moving body may deviate from the scanning path of the light beam, which may interfere with the guidance of the moving body.

On the other hand, in order to facilitate the detection of light reception, it is possible to use a cylindrical lens to widen the beam width, but this method significantly reduces the intensity of the beam, so this method is not practical.

C6 Purpose of the Invention The present invention provides a method for guiding and controlling a moving object and scanning a light beam for information transmission in which the detector of the moving object is unlikely to deviate from the scanning path of the light beam and the beam intensity is not significantly reduced. is intended to provide.

d0 Features of the Invention This invention is characterized in that a light beam emitted from a single light beam generator is divided into a plurality of light beams, and the path of a moving body is scanned with the plurality of light beams. There is.

e. Description of the Embodiment FIG. 1 is a perspective view (2) schematically showing an embodiment of the present invention. In FIG. 1, 1 is a laser beam generator, and 2 is a rotating mirror rotated by a motor 3. In FIG. Between the laser beam generator 1 and the rotating mirror 2, a plurality of half mirrors 4a to 4C are fixed and combined as appropriate.
and reflective mirrors 5a to 5C.

A nof mirror 6 and a detector 7 are provided in conjunction with the above-described scanning means.

That is, a directional laser beam emitted from a single laser beam generator 1 is divided into two parallel laser beams by a half mirror 4a and a reflecting mirror 5a,
Furthermore, each laser beam is divided by the next half mirror 4b, reflection mirror 5b, half mirror 4C, and reflection mirror 5C. As a result, four parallel laser beams are incident on the rotating mirror 2, and these laser beams are scanned on the path of the moving body via the half mirror 6.

For example, a laser beam reflected and returned from a moving object is reflected by a half mirror 6 and enters a detector 7.

(3) FIG. 2 is an explanatory diagram showing a state in which a laser beam scanned by the method shown in FIG. 1 enters a detector mounted on a moving body.

In FIG. 2, 8 is a detector placed on the moving body. This may be, for example, a corner cube that reflects an incident laser beam in the same direction as the direction of incidence.

As is clear from Fig. 2, when the moving object moves, the detector 8
Even if the position changes to the position shown by the chain line, one of the four laser beams is incident on the detector 8, so
The detector 8 is difficult to deviate from the scanning path of the light beam.

In the above-described embodiment, one laser beam is divided into four beams, but the present invention is not limited to this, and any number of light beams may be used for scanning.

In addition, in the embodiment, scanning is performed by reflecting the divided laser beam by a rotating mirror, but this uses a small laser beam generator such as a semiconductor laser generator, and this laser beam generator ( 4) A plurality of half mirrors and total reflection mirrors may be integrally formed, and the whole may be rotated by a motor.

Furthermore, although the embodiments have been described as scanning with a laser beam, scanning with a light beam such as infrared light or visible light may also be used.

10 Effects of the Invention According to the present invention, since the width of the scanning light beam can be widened, the detector of the moving body is less likely to deviate from the scanning path of the light beam.

Furthermore, since the present invention divides the light beam into a plurality of beams and scans them, it also has the advantage that the beam intensity is relatively less likely to decrease.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of an embodiment of the present invention, and Fig. 2 is an explanation showing a state in which a laser beam scanned by the method shown in Fig. 1 is incident on a detector mounted on a moving body. It is a diagram. 1... Laser beam generator, 2... Rotating mirror, 3
(5) ... Motor, 4a to 4C16, ... Half mirror 1
5a-5C... Reflection mirror, 7.8... Detector. Patent applicant: Hitachi Kiden Kogyo Co., Ltd. Toshihiro Tsumura, patent attorney Koji Onishi (6) Figure 1 2 Figure 2 405-

Claims (1)

[Claims] Guidance control of a moving body, characterized in that a light beam irradiated from a single light beam generator is divided into a plurality of light beams, and the path of the moving body is scanned with the plurality of light beams, and A method of scanning a light beam for information transmission.