JPS6060620A - Light signal encoding device - Google Patents

Abstract

PURPOSE:To obtain many kinds of encoded signals easily by providing plural shutter plates between a demultiplexer and a multiplexer, and boring plural through holes which allow the selective transmission of a light signal from the demultiplexer to the multiplexer in the shutter plates. CONSTITUTION:A light signal with three wavelengths lambda1-lambda3 from an optical fiber is demultiplexed by the demultiplexer into signals with the respective wavelengths lambda1-lambda3, which are projected upon both shutter plates 3A and 3B. For the purpose, both shutter plates 3A and 3B are moved relatively to pass the light signals with the wavelengths lambda1-lambda3 selectively to the multiplexer 2, and the light signals passed through the shutter plates 3A and 3B are multiplexed by the multiplexer 2, which input the encoded light signal to an optical fiber 13. Then, the wavelength of the light signal incident to the optical fiber 13 is detected to decode the encoded signal. For example, up to 16 ways of encoding is performed by a light signal with four kinds of wavelength.

Description

[Detailed description of the invention] The present invention relates to an optical signal encoding device.

In conventional optical signal encoding devices, a single shutter plate is interposed between the light emitting side and the light receiving side, and the shield plate controls light blocking and light transmission from the light emitting side to the light receiving side. It encoded optical signals. However, with such a configuration, the number of types that can be encoded is extremely small, and it is difficult to obtain many types of encoded signals.

The present invention has been made in view of such circumstances, and it is an object of the present invention to provide an optical signal encoding device that can easily obtain a wide variety of encoded signals.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, in FIG.
are interposed so as to be relatively movable with respect to each other, and by relatively moving these shutter plates 3A and 3B in a direction perpendicular to the paper plane of FIG. 1, three different wavelengths λ1. λ2. Eight types of encoded signals can be created from an optical signal of λ3.

The demultiplexer 1 consists of a collimating lens 4 and three dichroic mirrors 5, 6, and 7. The dichroic mirrors 5 to 7 are spaced apart from each other along the optical path of the parallel light of the collimator lens 4. 4 with respect to the optical path
They are arranged parallel to each other and inclined in the direction of 5 degrees. Furthermore, the dichroic mirror 5 reflects the light with the wavelength λ1, the dichroic mirror 6 reflects the light with the wavelength λ2, and the dichroic mirror 7 reflects the light with the wavelength λ3, and has the function of allowing light of other wavelengths to pass through. . At the focal point of the collimating lens 4 in the demultiplexer 1, an optical fiber 8 serving as a light emitting section is arranged facing the collimating lens 4, and from the optical fiber 8 each wavelength λ1. λ2. An optical signal containing λ3 is input to the demultiplexer 1.

The mixer 2 includes three dichroic mirrors 10°, 11.
12 and a condensing lens 9, the dichroic mirrors 10 to 12 are tilted at 45 degrees with respect to the optical path of the reflected light from each dichroic mirror 5, 6, and 7 in the splitter 1. arranged in parallel. Each dichroic mirror 10, 11, 12 has a corresponding wavelength λ1. A condenser lens 9 is arranged on the optical path of the reflected light from each of the dichroic mirrors 10 to 12, and has the function of reflecting light of wavelengths λ2 and λ3 and allowing transmission of light of other wavelengths. At the focal point of the condensing lens 9 in the mixer 2, an optical fine nozzle 13 serving as a light receiving section is arranged facing the condensing lens 9.

In FIG. 2, first and second shutter plates 3A.

3B is the reference position BP, that is, the optical path position from the demultiplexer 1 to the mixer 2, and the four movement positions A1 to A4°81 to B4.
They can be relatively moved so that they are positioned individually, and their moving positions are held by click stoppers (not shown). In addition, through holes are formed in both shutter plates 3A and 3B at three positions corresponding to the optical paths of the optical signals of three wavelengths λ1 to λ3 to the demultiplexer 1 or the mixer 2, respectively. That is, the first shutter plate 3A is provided with a through hole 14 at a moving position A3 corresponding to the optical path of the wavelength λ1,
A through hole 15 is formed between the moving positions A2 and 73 corresponding to the optical path of wavelength λ3, and a transparent hole 16 is formed between the moving positions A2 and 73 corresponding to the optical path of wavelength λ3. Further, the second shutter plate 3B is provided with a through hole 17 extending between the moving positions 81 and B4 corresponding to the optical path of the wavelength λ1, and a through hole 17 extending from the moving position B1 to B4 corresponding to the optical path of the wavelength λ2. A through hole 18° 19 is bored in B4, and a through hole 20 is bored between moving positions B3 and 84 corresponding to the optical path of wavelength λ3. In addition, the movement position Bl of both ends of the second shutter plate 3A,
The through holes 18, 19 in B4 may be cut out as shown by the two-dot chain line.

According to the first and second shutter plates 3A and 3B, each of the moving positions 71 to A2 and B1 at the reference position BP
- B4 can be made in eight combinations, and the combination of these moving positions results in a maximum of eight different combinations of through-holes and light shielding for the three wavelengths λ1 to λ3 from the demultiplexer 1 to the mixer 2.

Next, to explain the operation of the embodiment, first, the three wavelengths λ1. λ2. The optical signal containing λ3 is demultiplexed by the demultiplexer 1 into wavelengths λ1 to λ3, respectively, and both shutter plates 3A.

It is emitted to the 3B side. Here, both shutter plates 3A.

By relatively moving the shutter plates 3B and selecting the through holes and the shielding of the optical signals of each wavelength λ1 to λ3 to the mixer 2 side, the engraving of the clear #l book (no change in content) is achieved.Both shutter plates 3A, 3B The optical signals that have passed through the
is incident on the By detecting the wavelength of the optical signal incident on the original fiber 13, the encoded signal can be decoded.

Here, Table 1 shows an example in which the present encoding device is used as a switch device for operating a windshield wiper and a washer of an automobile.

Table 1 In this Table 1, "1" refers to both shutter plates 3A.

JP-A-Sho GO-60620 (3) Indicates a state in which transmission of 3B is allowed, [0] indicates a light shielding state by both shutter plates 3A and 3B, and "-" indicates that either light transmission or light shielding is acceptable. .

In the above embodiment, three optical signals λ1 to λ with different wavelengths are used.
3, the present invention is not limited thereto, and it is possible to encode using optical signals of multiple types of wavelengths. For example, if optical signals of four types of wavelengths are used, up to 16 codes can be encoded. can be achieved.

As described above, according to the present invention, there is a demultiplexer that demultiplexes an optical signal from a single light emitting section into multiple types and outputs them in parallel, and a demultiplexer that mixes the multiple types of optical signals from the demultiplexer. A plurality of shutter plates are interposed so as to be relatively movable between the mixer and the mixer, which allows the light to enter a single light receiving section. Since a plurality of through holes are provided to allow selective transmission of optical signals into the device, a wide variety of encoded signals can be obtained very easily.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a diagram showing the overall arrangement, and FIG. 2 is a diagram showing a combination of through holes in both shutter plates. DESCRIPTION OF SYMBOLS 1... Duplexer, 2... Mixer, 3A, 3B... 1st and 2nd shutter plates, 8... Optical fiber as a light emitting part, 13... Optical fiber as a light receiving part , 14-20
...Through hole Figure 1 Figure 2 Procedural amendment, Kae, February - 3, 1980 To the late Commissioner of the Patent Office A 1. Indication of the case 1982 Patent Application No. 169854 2. Title of the invention Optical signal coding device 3, relationship with the amended person case Patent applicant name Toyodenso Co., Ltd. (1 other person) 4. Agent 105 Address 1, 4-4-5 Shinbashi, Minato-ku, Tokyo Nijimuravir 5, date of amendment order

Claims (1)

[Claims] A splitter that splits the optical signal from a single light emitting part into multiple types and outputs them in parallel; A mixer that mixes the multiple types of optical signals from the splitter and enters a single light receiving part a plurality of through holes which are interposed between the demultiplexer and the mixer so as to be movable relative to each other and allow transmission of a plurality of types of optical signals from the demultiplexer; An optical signal encoding device characterized in that the perforation position comprises a plurality of shutter plates set to enable selective transmission of the optical signal by the relative movement.