GB2116742A - Apparatus for the transmission and distribution of light radiation - Google Patents
Apparatus for the transmission and distribution of light radiation Download PDFInfo
- Publication number
- GB2116742A GB2116742A GB8207625A GB8207625A GB2116742A GB 2116742 A GB2116742 A GB 2116742A GB 8207625 A GB8207625 A GB 8207625A GB 8207625 A GB8207625 A GB 8207625A GB 2116742 A GB2116742 A GB 2116742A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prism
- light
- light radiation
- face
- light guide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
- H03K17/79—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled controlling bipolar semiconductor switches with more than two PN-junctions, or more than three electrodes, or more than one electrode connected to the same conductivity region
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0005—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being of the fibre type
- G02B6/0006—Coupling light into the fibre
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2808—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using a mixing element which evenly distributes an input signal over a number of outputs
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4201—Packages, e.g. shape, construction, internal or external details
- G02B6/4249—Packages, e.g. shape, construction, internal or external details comprising arrays of active devices and fibres
- G02B6/425—Optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4298—Coupling light guides with opto-electronic elements coupling with non-coherent light sources and/or radiation detectors, e.g. lamps, incandescent bulbs, scintillation chambers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/10—Modifications for increasing the maximum permissible switched voltage
- H03K17/105—Modifications for increasing the maximum permissible switched voltage in thyristor switches
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Couplings Of Light Guides (AREA)
- Power Conversion In General (AREA)
- Thyristors (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
An apparatus for the transmission and distribution of light radiation comprising at least one source (1) of light radiation and an optical mixer in the form of a prism (3) made with parameters enabling multiple reflection of light radiation of each source from the side faces of the prism (3) which is optically coupled with one end face to the output of each light radiation source (1,2) and with the other end face to the input of a distributing light guide (4). The invention is particularly described with reference to series connected thyristors. <IMAGE>
Description
SPECIFICATION
Apparatus for the transmission and distribution of light radiation
The invention relates to high-voltage conversion equipment and deals with optical control systems for controlling series connected thyristors, and more particularly, the invention relates to apparatus for the transmission and distribution of light radiation.
An apparatus for the transmission and distribution of light radiation may be used in converting bridge circuits of direct current power transmission lines, in static compenstors for reactive power, as well as in various vehicles and in the mechanical engineering equipment for illuminating the scales of instruments and for light indication of light display boards.
It is an object of the invention to provided apparatus for the transmission and distribution of light radiation which ensures uniform distribution of radiation over the illuminated surface or among photocells of receivers, hence an improved reliability of the receivers.
Another object of the invention is to provide an apparatus for the transmission and distribution of light radiation which ensures simplified methods of assembly when used in a high-voltage thyristor rectifier optical control system.
Still another object of the invention is to provide an apparatus forthe transmission and distribution of light radiation wherein the life of radiation sources is prolonged.
These objects are accomplished by that an apparatusforthetransmission and distribution of light radiation, comprising at least one source of light radiation having an output which is optically coupled to an input of a distributing light guide, according to the invention, comprises an optical mixer in the form of a prism which is made with parameters enabling multiple reflection of light radiation of each source from the side faces of the prism which is optically coupled with one end face to the output of each light radiation source and with the other end face to the input of the distributing light guide.
In case light radiation-to-electric signal converters are used having their inputs optically coupled to respective outputs of the distributing light guide and accommodated in a sealed casing filled with a liquid or gaseous insulating material, the prism is preferably installed in the casing, and the apparatus comprises a rigid light guide in the form of a rod for optically coupling each light radiation source to the prism,the cross-sectional area of the rod being equal to, or smaller than, the area of the end face of the prism, and the prism is provided with a guide member installed on its end face facing the rod, the end of the rod moving along the guide member when the rod is installed in the casing.
In case a light radiation control circuit is used which has an input optically coupled to the output of the light guide for sampling a part of the radiation, the input of the light guide is preferably optically coupled to the end face of the prism facing the light radiation source.
The apparatus for the transmission and distribution of light radiation according to the invention is simple in structure and makes it possible to obtain in the practice high uniformity of distribution of radiation from one or several sources among outputs of the distributing light guide so as to improve the efficiency of utilization of the sources. Moreover, this makes it possible to use identical converters at the outputs of the apparatus, with a simplified electrical configuration forming substantially identical electric signals so as to ensure high reliability of optical control system. The apparatus also ensures identical brightness and illumination of illuminated portions of display boards and panels in display and illumination systems, respectively.
The invention will now be described with reference to specific embodiments illustrated in the accompanying drawings, in which:
Figure 1 is a diagrammatic view of an apparatus for the transmission and distribution of light radiation according to the invention in a system for illuminating the scales of instruments;
Figure 2 is a diagrammatic view of an apparatus for the transmission and distribution of light radiation according to the invention in a system for optical control of a high-voltage thyristor rectifier, having a control circuit provided with a light guide directly connected to the end face of a prism, and a collector-type light guide for optically coupling sources to the prism;;
Figure 3 is an embodiment of an apparatusforthe transmission and distribution of light radiation according to the invention, having a prism, a distributing light guide, and actuator elements enclosed in a sealed casing, and a control circuit having a light guide which is optically coupled to the prism by means of a rigid light guide in the form of a rod.
An apparatus forthe transmission and distribution of light radiation comprises at least one source of light radiation: sources 1,2 (Figure 1) in this embodiment, and an optical mixer in the form of a prism 3 having an end face optically coupled to the outputs of the sources 1, 2. The prism 3 is made with parameters enabling multiple reflection of light radiation of the sources 1,2 from the side faces of the prism. The other end face of the prism 3 is coupled to the input of a distributing light guide 4.
It is preferred to use a rectangular square-section prism made of an optical glass as the optical mixer.
The side face of the prism may be with or without light-insulating coating. In the latter case the surface should have minimum area of optical contact with a protective casing (not shown), and the index of refraction of the prism material should be greater than the index of refraction of the ambient medium.
In this embodiment the prism 3 is made of an optical glass with the index of refraction n = 1.52 and with polished faces. The ratio of the edge length of the prism 3 to the length of the base side is 20:1.
When the input end face of the prism 3 is illuminated with a conical light beam with the spot diameter on the end face 2 mm and with an angle at the vertex 40 , independent of the position of the spot on the input end face, illumination with non-uniformity of maximum 5% is obtained at the output end face of the prism.
This property makes it possible to use such prism for adding light radiations from several sources and for uniform distribution of radiation over the illuminated surface, in particular, for illuminating the scales of instruments 5.
Sources 1,2 of light radiation may comprise incandescent lamps, gas-discharge lamps lightemitting diodes, lasers.
Optical coupling of such sources of light radiation to the end face of the prism 3 may be effected in various ways. Thus, in this embodiment of the apparatus the use is made of a lense optical system conventionally shown in biconvex lenses 6. Light flux from the sources 1,2 is focused by means of the lenses 6 through an electrically insulating air gap directly at the input end face of the prism 3.
Optical coupling of the prism 3 to the input of the distributing light guide 4 is effected through their direct contact. The light guide 4 and the prism 3 may be made in the form of an integral structure as an element of the optical system. Their coupling may be effected in any manner so as to ensure adequate light transmission and mechanical strength. The number of outputs in the form of output strands of the light guide 4 is chosen depending on specific application, and the length thereof should be minimum and sufficientforwiring.
Optical coupling of the light radiation sources 1,2 to the input end of the prism 3 may be effected by means of a collector-type light guide 7 (Figure 2) which is more preferable compared to the abovedescribed lense optical system. The cross-sectional area of strands of the light guide 7 is chosen in such a manner as to focuse all radiation from the sources 1,2 at their end faces.
The length and design of the light guide 7 should be chosen in such a manner as to ensure a reliable electrical insulation of a high-voltage thyristor rectifier 8 which is controlled by means of the apparatus according to the invention. The output end face of the collector light guide 7 may be of round or square section and is coupled to the end face of the prism 3 by means of a detachable connector.
For forming a signal for controlling the highvoltage thyristor 8, the radiation sources 1, 2 used in the apparatus may comprise gas-discharge lamps, light-emitting diodes, semiconductor lasers such as an injection-type gallium arsenide lasers functioning on the pulse basis, and there are provided light radiation-to-electric signal converters 9. The end faces of the output strands of the distributing light guide 4 are optically coupled each to a respective converter 9 which may be built around photodiode, phetotransistor or photothyristor.In such case the cross-sectional area of strands of the light guide 4, the coupling of the trands to the converters 9, and
parameters of light radiation sources 1,2 should be chosen in such a manner that the coefficient of transmissiion of light radiation to a sensitive area of each converter 9 be at maximum and that radiation power at the end faces of the output strands be sufficient for reliable functioning of the converter 9.
In order to ensure reliable operation of the highvoltage thyristor rectifier 8, redundant converters 9 are provided at each module of the rectifier 8.
In the apparatus for the transmission and distribution of light radiation there is provided a circuit 10 for controlling light radiation, e.g. by radiation power, and a light guide 11 is provided for sampling a part of the light radiation. Output and input of the light guide 11 are optically coupled to an optical window of a photoreceptor at the input of the circuit 10 and to the output end face of the prism 3, respectively.
Optical coupling is effected by means of optical connectors (not shown).
Sampling a part of light radiation for controlling radiation power is effected owing to the backward reflection of a part of the radiation from the output end face of the prism.
In case the collector light guide 7 is used for optically coupling the sources 1,2 to the prism 3, the light guide may comprise a strand serving as the light guide 11 for sampling a part of the light radiation.
It follows from the properties of the prism 3 that the circuit 30 can ensure a general control with the use of one or several sources of light radiation.
Owing to the multiple reflection of radiation from the side faces of the prism 3 with forward and backward beams, high degree of proportionality of radiation sampled for radiation control is ensured both with respect to total radiation of one or several sources and to the radiation at the output strands of the light guide 4. Consequently, the control circuit 10 may be adjusted both to the total radiation of the sources and to the radiation from the output of the apparatus. The latter capability of the circuit is due to the uniform distribution of the light radiation among the output strands of the light guide 4.
Independent of what kind of control (general or output) is effected, the control circuit 10 remains unchanged and may have a configuration known to those skilled in the art.
In case the high-voltage thyristor rectifier 8 is accommodated in a sealed casing 12 (Figure 3) filled with a liquid or gaseous insulating material such as transformer oil, the prism 3, distributing light guide 4, and converters 9 are also installed in the casing 12.
Optical coupling ofthe light radiation sources 1,2 to the prism 3 is effected by means of a rigid light guide in the form of a rod 13 with the cross-sectional area equal to, or smallerthan, the area of the input end face of the prism 3. For an optical coupling of the rod 13 to the prism 3 installed in the casing 12, the prism 3 has a guide member 14 installed on the input end face thereof, and for the insertion of the rod 13 into the casing 12, there is provided a sealing bushing 15.
The rod 13 has a cross-section identical with the cross-section of the output end of the collector light guide 7 but equal to, or smaller than, the crosssection of the prism 3.
It is most preferred to make the guide member 14 with the inner working surface in the form of the surface of truncated pyramid.
When the rod 13 is installed, the bushing 15 ensures a rough guiding toward the prism 3 and so that the end of the rod will necessarily get into the zone defined by the guide member 14. When the rod 13 is pushed home, the end of the rod 13 moves along the guide member 14 so as to ensure its optical contact with the end face of the prism 3.
The distributing light guide 4, prism 3, rod 13, and converters 9 should be designed for operation in oil.
In case the rod 13 is provided, a part of light radiation is sampled for the control circuit 10 by means of the light guide 11 by the direct contact of its input end with the end face of the rod 13.
In operation of the apparatus for the transmission and distribution of light guide, e.g. in a system for illumination of the scales of instruments, the light radiation sources 1,2 (Figure 1) such as incandescent lamps are turned on by feeding electric supply thereto. The radiation from the sources 1,2 is focused by means of the optical lense system in the form of biconvex lenses 6 at the input end face of the prism 3. High focusing accuracy is not required.
Thus, when the focused radiation spot takes an area smaller than the area of the end face of the prism 3 a considerable unfocusing and displacement of the spot over the end face are permitted, provided that the focused radiation is within the area of the end face of the prism 3.
The light radiation incident upon the prism 3 subjected to multiple reflection from its side faces passes from the input end face toward the output face and gets to the input of the distributing light guide 4 which is in the direct contact with the prism 3. Uniform illumination from each source 1,2 is obtained at the input end face of the distributing light guide 4 with any non-uniformity of radiation by area and angle at the input end face of the prism within the limits of the aperture of the prism 3.
Owing to this, equal power of radiation from each source 1,2 is achieved at the output strands of the distributing light guide 4with equal cross-sectional areas and transmission coefficients of the strands.
This uniform radiation from the output strands of the light guide 4 is fed for illumination of the scales of instruments 5, each strands illuminating an individual scale.
In case the output strands of the light guide 4 are of different length in accordance with design considerations, coefficients of transmission of the strands may be substantially different. In each case, in order to provide for identical radiation power at the output of the strands of the light guide 4, each strand should have the cross-sectional area inversely proportional to its coefficient of transmission.
The apparatus for the transmission and distribution of light radiation in a system for controlling a high-voltage thyristor rectifier functions substantially similarly to the above-described apparatus.
The apparatus is started by electric starting pulses which are fed simultaneously to the input of the sources 1,2 (Figure 1) such as semiconductor pulse lasers. Laser radiation is focused at the end faces of strands of the collector light guide 7 and is fed along the light guide 7 to the end face of the prism 3. When the radiation from the sources 1,2 passes through the prism 3 it is partly reflected from the output end face of the prism 3 toward its input end. A part of this reflected radiation gets into the light guide 11 for sampling a part of the light radiation and is fed to the photoreceptor of the control circuit 10 controlling, e.g. radiation power. A signal from control circuit 10 is fed to a control board of the high-voltage thyristor rectifier (not shown in the drawing).
The amount of sampled radiation fed to the control circuit 10 depends on the coefficient of reflection of the output end face of the prism 3 on the cross-sectional area of the light guide 11 and its coefficient of transmission (for the coated end face the coefficient of reflection is about 0.5% and for uncoated end face this coefficient is about 4%).
Light signals of radiation of both sources 1,2 uniformly distributed among the output strands of the light guide 4 are fed to the sensitive areas of the converters 9. Light signals of radiation are converted into electric control pulses in the converter 9 to be fed to the high-voltage thyristor rectifier 8.
Redundant converters 9 are provided at each module of the rectifier 8, and the sensitivity of the converters 9 is such as to work normally in case of the two sources 1, 2 fails. This system of redundancy of the sources 1,2 and converters 9 crossredundancy makes it possible to ensure high reliability of the high-voltage thyristor rectifier optical control system.
The embodiment of the apparatus according to the invention works along the same lines as the system shown in Figure 2 and described above in a system of optical control of a high-voltage thyristor rectifier enclosed in the sealed casing 12 (Figure 3) filled with a liquid or gaseous insulating material such as transformer oil. The only difference resides in that in operation of the apparatus the coefficient of transmission of the rod 13 should be taken into account since the rod 13 will somewhat lower both radiation fed to the converters 9 from the light radiation sources 1,2 and radiation reflected from the output end face of the prism 3 and fed to the control circuit 10.
In all three above-described embodiments of the apparatus according to the invention the structure and manufacture of the optical mixer in the form of a prism are much simpler compared to the fiber matrix disclosed in the prior art. At the same time, better uniformity of light splitting is achieved, uniform illumination of the input end faces of strands of the collector light guide is not required, the requirements to the sources of light radiation and to their coupling to the light guide strands are lower.
As differed from the concentrator described in the analogous art, the optical mixer made in the form of a prism ensures guaranteed uniformity of splitting of light radiation.
The employment of the apparatus according to the invention makes it possible to improve reliability of optical control of high-voltage thyristor rectifiers owing to a necessary degree of redundancy achieved by simple means; eliminate the influence of exposure and dust deposits on working surfaces of elements of the optical path based on lightemitting diodes installed in the direct optical contact with the prism, radiation sources and converters.
Moreover, the possibility of disruption of adjustment of the optical path is eliminated, first, owing to the above-mentioned direct contact between elements of the optical path; second, because the light spot can move within the input and face of the prism; third, owing to the use of a mechanical means (guide member) for ensuring complete optical contact of the rod with the input end face of the prism.
Reliability of optical control is also improved owing to uniform distribution of light signal among the converters and absence of special adjustment of the elements of optical path which, in addition, makes it possible to simplify the maintenance of the apparatus, especially in high-voltage thyristor rectifier control system.
In addition, the apparatus has a prolonged service life without preventive maintenance.
Claims (4)
1. An apparatus forthe transmission and distribution of light radiation, wherein at least one light radiation source has an output optically coupled to an input of a distributing light guide, and there is provided an optical mixer in the form of a prism made with parameters enabling multiple reflection of light radiation of each source from the side faces of the prism which is optically coupled with one end face to the output of each light radiation source and with the other end face to the input of the distributing light guide.
2. An apparatus for the transmission and distribution of light radiation as claimed in claim 1, wherein, in case there are provided light radiationto-electric signal converters having their inputs optically coupled to respective outputs of the distributing light guide and accommodated, together with the light guide, in a sealed casing filled with a liquid or gaseous insulating material, the prism is also installed in the casing and is optically coupled to each light radiation source by means of a rigid light guide in the form of a rod having a cross-sectional area which is equal to, or smaller than the area of the end face of the prism, the prism having a guide member installed on the end face thereof facing the rod, the end of the rod moving along the guide member when installed in the casing.
3. An apparatus forthe transmission and distribution of light radiation as claimed in one of claims 1,2, wherein, in case a light radiation control circuit is used which has an input optically coupled to the output of a light guide for sampling a part of light radiation, the input of the light guide is optically coupled to the end face of the prism facing the light radiation source.
4. An apparatus forthe transmission and distribution of light radiation substantially as hereinabove described with reference to, and as shown in the accompanying drawings.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH109582A CH659528A5 (en) | 1982-03-16 | 1982-02-23 | DEVICE FOR TRANSMITTING AND DISTRIBUTING A LIGHT RADIATION. |
| SE8201182A SE453949B (en) | 1982-03-16 | 1982-02-25 | DEVICE FOR TRANSFER AND DISTRIBUTION OF LIGHT RADIATION |
| DE19823208260 DE3208260A1 (en) | 1982-03-16 | 1982-03-08 | DEVICE FOR TRANSMITTING AND DISTRIBUTING LIGHT RADIATION |
| GB8207625A GB2116742A (en) | 1982-03-16 | 1982-03-16 | Apparatus for the transmission and distribution of light radiation |
| FR8204755A FR2523733B1 (en) | 1982-03-16 | 1982-03-19 | DEVICE FOR THE TRANSMISSION AND DISTRIBUTION OF LIGHT RADIATION |
| CA000400481A CA1181275A (en) | 1982-03-16 | 1982-04-05 | Apparatus for the transmission and distribution of light radiation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8207625A GB2116742A (en) | 1982-03-16 | 1982-03-16 | Apparatus for the transmission and distribution of light radiation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2116742A true GB2116742A (en) | 1983-09-28 |
Family
ID=10529031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8207625A Withdrawn GB2116742A (en) | 1982-03-16 | 1982-03-16 | Apparatus for the transmission and distribution of light radiation |
Country Status (6)
| Country | Link |
|---|---|
| CA (1) | CA1181275A (en) |
| CH (1) | CH659528A5 (en) |
| DE (1) | DE3208260A1 (en) |
| FR (1) | FR2523733B1 (en) |
| GB (1) | GB2116742A (en) |
| SE (1) | SE453949B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0192164A2 (en) * | 1985-02-16 | 1986-08-27 | Nippon Hoso Kyokai | Optical coupling device |
| GB2172161A (en) * | 1985-03-04 | 1986-09-10 | Raytheon Co | High voltage solid state switch |
| US4697096A (en) * | 1985-03-04 | 1987-09-29 | Raytheon Company | High voltage solid state switch |
| GB2208012A (en) * | 1987-08-05 | 1989-02-15 | Marconi Gec Ltd | Testing semi conductor devices |
| WO1993014432A2 (en) * | 1992-01-14 | 1993-07-22 | Summit Technology, Inc. | Methods and apparatus for distributing laser radiation |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3722666A1 (en) * | 1987-07-09 | 1989-01-19 | Bosch Gmbh Robert | HIGH VOLTAGE SWITCH |
| DE3924060A1 (en) * | 1989-07-21 | 1991-01-24 | Bodenseewerk Perkin Elmer Co | ATOMIC ABSORPTION SPECTRAL PHOTOMETER FOR MULTI-ELEMENT ANALYSIS |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1269502A (en) * | 1968-05-16 | 1972-04-06 | English Electric Co Ltd | Improvements in thyristor firing circuits |
| GB1285884A (en) * | 1968-11-01 | 1972-08-16 | English Electric Co Ltd | Fibre optic signal transmission system |
| GB1493138A (en) * | 1973-11-28 | 1977-11-23 | Patelhold Patentverwertung | Fibre network for the optoelectronic transmission of data between subscriber stations |
| GB1508567A (en) * | 1974-03-28 | 1978-04-26 | Siemens Ag | Optical communications systems |
| GB2058396A (en) * | 1979-09-04 | 1981-04-08 | Bunker Ramo | Terminating Optic Fibers |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7024961U (en) * | 1900-01-01 | Imperial Gmbh | Floodlight scale | |
| US2507035A (en) * | 1945-05-16 | 1950-05-09 | Bert G Maynard | Plastic instrument panel |
| US3541341A (en) * | 1968-02-21 | 1970-11-17 | Gen Electric | Redundant fiber-optic light guide construction |
| SU540337A1 (en) * | 1972-06-07 | 1976-12-25 | Предприятие П/Я Р-6517 | Light system of modular control of thyristor blocks |
| US3901581A (en) * | 1973-07-05 | 1975-08-26 | Corning Glass Works | Tapered coupler for optical communication system |
| JPS5429034Y2 (en) * | 1975-05-01 | 1979-09-17 | ||
| US4261641A (en) * | 1979-04-02 | 1981-04-14 | The Boeing Company | Active multiport fiber optic data bus coupler |
| FR2463422A1 (en) * | 1979-08-10 | 1981-02-20 | Thomson Csf | CONNECTOR FOR OPTICAL FIBERS |
-
1982
- 1982-02-23 CH CH109582A patent/CH659528A5/en not_active IP Right Cessation
- 1982-02-25 SE SE8201182A patent/SE453949B/en not_active IP Right Cessation
- 1982-03-08 DE DE19823208260 patent/DE3208260A1/en not_active Withdrawn
- 1982-03-16 GB GB8207625A patent/GB2116742A/en not_active Withdrawn
- 1982-03-19 FR FR8204755A patent/FR2523733B1/en not_active Expired
- 1982-04-05 CA CA000400481A patent/CA1181275A/en not_active Expired
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1269502A (en) * | 1968-05-16 | 1972-04-06 | English Electric Co Ltd | Improvements in thyristor firing circuits |
| GB1285884A (en) * | 1968-11-01 | 1972-08-16 | English Electric Co Ltd | Fibre optic signal transmission system |
| GB1493138A (en) * | 1973-11-28 | 1977-11-23 | Patelhold Patentverwertung | Fibre network for the optoelectronic transmission of data between subscriber stations |
| GB1508567A (en) * | 1974-03-28 | 1978-04-26 | Siemens Ag | Optical communications systems |
| GB2058396A (en) * | 1979-09-04 | 1981-04-08 | Bunker Ramo | Terminating Optic Fibers |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0192164A2 (en) * | 1985-02-16 | 1986-08-27 | Nippon Hoso Kyokai | Optical coupling device |
| EP0192164A3 (en) * | 1985-02-16 | 1987-10-21 | Nippon Hoso Kyokai | Optical coupling device |
| US4807954A (en) * | 1985-02-16 | 1989-02-28 | Nippon Hoso Kyokai | Optical coupling device |
| GB2172161A (en) * | 1985-03-04 | 1986-09-10 | Raytheon Co | High voltage solid state switch |
| US4697096A (en) * | 1985-03-04 | 1987-09-29 | Raytheon Company | High voltage solid state switch |
| GB2208012A (en) * | 1987-08-05 | 1989-02-15 | Marconi Gec Ltd | Testing semi conductor devices |
| WO1993014432A2 (en) * | 1992-01-14 | 1993-07-22 | Summit Technology, Inc. | Methods and apparatus for distributing laser radiation |
| US5395362A (en) * | 1992-01-14 | 1995-03-07 | Summit Technology | Methods and apparatus for distributing laser radiation |
| WO1993014432A3 (en) * | 1992-01-14 | 2004-04-29 | Summit Technology Inc | Methods and apparatus for distributing laser radiation |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3208260A1 (en) | 1983-09-22 |
| SE453949B (en) | 1988-03-14 |
| CA1181275A (en) | 1985-01-22 |
| FR2523733A1 (en) | 1983-09-23 |
| FR2523733B1 (en) | 1985-11-29 |
| CH659528A5 (en) | 1987-01-30 |
| SE8201182L (en) | 1983-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |