SU1494213A1 - Optical converter - Google Patents

Abstract

In a switch, optical radiation from a radiation source 3 is supplied via photoconductor fibres 8, which are partially sheathed, to a radiation receiver 5 and is preferably manually acted upon. The photoconductor fibres 8 lie adjacent to one another on a contact surface 2 and the photoconductor fibres have no sheathing on the side lying opposite the points of contact of the photoconductor fibres with the contact surface. <IMAGE>

Description

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The invention relates to switches, in which optical radiation from a source of radiation is supplied to a radiation receiver by means of optical fibers, which are basically covered with a cladding; light sources and electrical or electronic devices, and as a dp button for input and output data in electronic devices.

A solution is known (DE 21 47047, clause 42 h 1/04, 1971), according to which at the end of the fiber elements facing the light source in order to extract non-parallel rays, the fiber elements are respectively covered or not sheathed so that the rays pass parallel to the fiber element are absorbed or exited from the fiber element. In this case, no physical impact on the transmitted luminous flux, in particular from contact, occurs.

The disadvantage is complexity and, as a result, reliability is low.

The purpose of the invention is to increase reliability and simplify off. The invention is based on the task of creating a switch, which, based on the purely optical principle, does not require the use of any moving elements to control it and eliminates the flow of current through the chepoveic body.

According to the invention, this problem is solved in such a way that the optical fibers are located at least at the same contact area and are covered with shells only on the side that faces the contact area. Due to this, it is possible for a light guide to physically-optically influence the transmission of light. For this purpose, the medium is more dense than the medium of the optical fiber (finger or overlap) in contact with the places of the optical fibers that are not covered by the cladding. As a result, the total reflection of the light supplied from the radiation source to the radiation receiver is attenuated. Weakening

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a constant light flux through the radiation receiver and the processing circuit is used to control the switching element.

The overlap can be made in the form of a membrane, which in a spring-like form is installed on top of parts of optical fibers without a shell so that it can be pressed to these parts with a finger. The membrane provides a more reliable seal against a mechanically and / or chemically active medium, therefore, contamination. All elements of the switch can be poured into the unit, thanks to which they are protected from dust, water, gases and vapors. There may be a small air gap between the membrane and the light guides, which is in the range of the membrane deflection.

The invention can be used with energy saving by using a radiation source and radiation that operate in a clock mode. In addition, it is possible to supply several beams of light guides and radiation detectors with a single radiation source. This type of embodiment of the invention is important in the case when control is provided for several remote elements that perform switching. H: Depending on whether one or more radiation receivers belong to a single radiation source, joint coding, feeding and decoding devices can be provided.

Thus, the sensors that control the elements made by switching can work separately or several elements that perform switching work with coding through a common wire.

FIG. 1 shows the proposed device, a longitudinal section; FIG. 2 - the same, in a horizontal projection; in fig. 3 — fiber located on the pressure surface, cross section.

In the holder 1 with an area of 2 contacts, a radiation source 3 is poured with contacts 4, a radiation receiver 5 with contacts 6 and with its ends is a bundle of optical fibers 8 consisting of optically efficient fibers (Fig. 3). Each fiber 7 is provided with a sheath 9, and

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the scrap fiber 7 is higher than the sheath 9. The entrance surface 10 of the light of the beam of light guides 8 is correspondingly located at the radiation source 3, and the exit surface 11 of its light is located at the radiation receiver 5, and the beam of light guides 8 nearby the entrance and exit surfaces of the light have a cylindrical shape. The bundle of light guides 8 is placed on the 2-touch area with separation in such a way that only one layer of the 8 optical fibers is located on the touch area. On the side opposite to the 2-touch area, the light guides 8 are not covered by the sheath 9 in the section 12. The distance from the section 12 of the light guides 8 is installed to the spring membrane 13. The distance to the membrane 13 is determined by a spacer 14 attached to the holder, with which it is firmly connected.

Light emanating from radiation source 3, B, as a continuous stream or pulse, is received by a beam of light guides 8 through the entrance surface 10 of the light and completely reflected in the fibers; ax 7 to the radiation receiver 5 through the output surface 11 of the light. If the fiber bundle 8 in section 12 is touched, for example, with a finger through

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the membrane 13, the refractive index of which is larger than that of the fibers 7, is not touched and completely reflected, the light is inserted from the fiber 7 at this place, so that the radiation receiver 5 does not receive less light or does not at all, resulting in no pulse generation in him.

Claims (2)

1. An optical switch that contains sources and receivers of radiation associated with coated clad fibers, is also distinguished by the fact that, in order to ensure reliable operation and simplification, the optical fibers are placed in a parallel single-15OD beam on a flat base with the possibility of contact between the shells At the same time, on the side opposite to the base, the optical fibers are made without shells, and an elastic membrane is placed above the optical fibers through spacers, which is installed with the possibility of touching the bare part of the optical fibers. 2. A switch according to claim 1, characterized in that the membrane is made of a material, the refractive index of which is preferably higher than the refractive index of the materials of the optical fibers. / x7