JPS6365924B2 - - Google Patents

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 shutter 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 has been 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. 1, a plurality of, for example, two first and second
Shutter plates 3A and 3B are interposed so as to be movable relative to each other, and by relatively moving these shutter plates 3A and 3B in a direction perpendicular to the paper plane of FIG.
Eight encoded signals can be created from optical signals of three different wavelengths λ ₁ , λ ₂ , and λ ₃ . The demultiplexer 1 consists of a collimating lens 4 and three dichroic mirrors 5, 6, and 7, and the dichroic mirrors 5 to 7 are spaced apart from each other along the optical path of the parallel light from the collimating lens 4. They are arranged parallel to each other and open and inclined at 45 degrees with respect to the optical path. Moreover, the dichroic mirror 5 emits light of wavelength λ ₁ , the dichroic mirror 6 emits light of wavelength λ _{2, and the dichroic mirror 7 emits light of wavelength λ 2} .
has the function of reflecting light of wavelength λ ₃ and allowing transmission of light of other wavelengths. At the focal point of the collimating lens 4 in the demultiplexer 1, an optical fiber 8 as a light emitting part is placed facing the collimating lens 4, and from the optical fiber 8, each wavelength λ ₁ , λ ₂ , λ ₃ is emitted. The optical signal containing the signal is input to the demultiplexer 1. Mixer 2 consists of three dichroic mirrors 1
0, 11, 12 and a condensing lens 9, each dichroic mirror 5, 6, 7 in the demultiplexer 1
The dichroic mirrors 10 to 12 are arranged parallel to each other so as to be inclined at 45 degrees with respect to the optical path of the reflected light. Each dichroic mirror 1
0, 11, and 12 have the function of reflecting the light of the corresponding wavelengths λ ₁ , λ ₂ , and λ ₃ from the demultiplexer 1, respectively, and allowing the transmission of light of other wavelengths, and each dichroic mirror A condensing lens 9 is arranged on the optical path of the reflected light from 10 to 12. At the focal point of the condensing lens 9 in the mixer 2, an optical fiber 13 serving as a light receiving section is arranged facing the condensing lens 9. In FIG. 2, the first and second shutter plates 3
A, 3B are the reference position BP, that is, the optical path position from the demultiplexer 1 to the mixer 2, and the four moving positions A1 to
A4, B1 to B4 can be relatively moved so as to be positioned individually, and their moving positions are held by a click stopper (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 λ ₁ to _{λ 3} from the demultiplexer 1 to the mixer 2.
That is, the first shutter plate 3A is provided with a transparent hole 14 at the moving position A3 corresponding to the optical path of the wavelength λ ₁ , and a transparent hole 14 is formed between the moving positions A2 and A3 corresponding to the optical path of the wavelength λ ₂ . A hole 15 is drilled, and a through hole 16 is drilled between moving positions A2 and A3 corresponding to the optical path of wavelength λ ₃ . Further, the second shutter plate 3B has a moving position B1 corresponding to the optical path of wavelength _λ1 .
A through hole 17 is bored between B4 and wavelength λ ₂
Through holes 1 are provided at moving positions B1 and B4 corresponding to the optical path of
8 and 19 are bored, and a through hole 20 is bored between moving positions B3 and B4 corresponding to the optical path of wavelength λ ₃ . Note that the through holes 18 and 19 at the movement positions B1 and B4 at both ends of the second shutter plate 3A may be cut out as shown by two-dot chain lines. Such first and second shutter plates 3A, 3
According to B, each movement position A at the reference position BP
Eight combinations of 1 to A2 and B1 to B4 can be made, and different combinations of through holes and light shielding for the three wavelengths λ ₁ to _{λ 3} from the demultiplexer 1 to the mixer 2 can be made by combining their moving positions. There are a maximum of 8 ways. Next, to explain the operation of this embodiment, first, an optical signal including three wavelengths λ ₁ , λ ₂ , λ ₃ from the optical fiber 8 is divided into three wavelengths λ 1 by the demultiplexer ₁ .
It is demultiplexed every ~λ ₃ and emitted to both shutter plates 3A and 3B. Here, by relatively moving the shutter plates 3A and 3B and selecting the through holes and blocking of the optical signals of each wavelength λ ₁ to _{λ 3} to the mixer 2 side, the light can be transmitted through the shutter plates 3A and 3B. The received optical signals are mixed by a mixer 2, and the encoded optical signals are input into an optical fiber 13. By detecting the wavelength of the optical signal input into the optical fiber 13, the encoded signal can be decoded. Table 1 shows an example in which the encoding device of the present invention is used as a switch device for operating the windshield wiper and washer of an automobile.

[Table] In this first table, "1" means both shutter plates 3
Indicates the state in which transmission of A and 3B is allowed, and is "0"
indicates a light-shielding state by both shutter plates 3A and 3B, and "-" indicates that either light-transmitting or light-shielding is acceptable. In the above embodiment, encoding using three optical signals λ ₁ to _{λ 3} with different wavelengths was described, but the present invention is not limited to this, and it is possible to encode using optical signals with multiple types of wavelengths. For example, by using optical signals of four different wavelengths, up to 16 types of encoding 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. and a mixer that enters a single light-receiving section.
Multiple shutter plates are interposed so that they can be moved relative to each other,
These shutter plates are provided with a plurality of through holes to allow selective transmission of optical signals from the demultiplexer to the mixer by relative movement of both shutter plates, so that multiple types of encoding can be performed. 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. 1... splitter, 2... mixer, 3A, 3B... first,
Second shutter plate, 8... Optical fiber as a light emitting part, 13... Optical fiber as a light receiving part, 14-2
0...Through hole.

Claims (1)

[Claims] 1. A splitter that splits the optical signal from a single light emitting section into multiple types and outputs them in parallel; and mixes the multiple types of optical signals from the splitter and inputs them into a single light receiving section. A mixer; a splitter and a plurality of through holes that are interposed between the splitter 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 splitter; An optical signal encoding device comprising: a plurality of shutter plates, each of which has a perforation position set to enable selective transmission of the optical signal by the relative movement.