US3474415A - Light responsive switching matrix - Google Patents
Light responsive switching matrix Download PDFInfo
- Publication number
- US3474415A US3474415A US567157A US3474415DA US3474415A US 3474415 A US3474415 A US 3474415A US 567157 A US567157 A US 567157A US 3474415D A US3474415D A US 3474415DA US 3474415 A US3474415 A US 3474415A
- Authority
- US
- United States
- Prior art keywords
- light
- matrix
- cross
- photoconductive
- line
- 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.)
- Expired - Lifetime
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q3/00—Selecting arrangements
- H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker
- H04Q3/52—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker using static devices in switching stages, e.g. electronic switching arrangements
-
- 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
Definitions
- the present invention relates in general to photoconductor devices and more particularly to a light controlled cross-point switching matrix for use in connection with telephone communication systems.
- the switching matrix is generally well known in the electronic art, and has been applied to many different uses in the various special fields thereof.
- One such use for the switching matrix is in the communication field, and especially in connection with telephone communication systems in the form of a speech cross-point matrix, which effects selective interconnection of line circuits.
- Mechanical cross-point switching to effect interconnection of line circuits in telephone systems has experienced continuing development and recent efforts have been directed to a. speech cross-point matrix responsive to light-controlled photoconductor elements.
- the orthogonal lines of the matrix are interconnected at the junctions thereof by photoresponsive resistors whose resistance is controlled by individual light sources at each cross-point of the matrix so as to make possible the completion of a path from one selected input line along the abscissa of the matrix to a single ordinate line at the output thereof. While these arrangements have proven satisfactory, the need for plural individual light sources at each of the cross-points of the matrix in addition to the manufacturing problems resulting from this requirement has made this construction both uneconomical and complicated to manufacture.
- each of the orthogonal lines representing the abscissa and ordinate of the cross-point matrix are provided with a pair of glass light conducting tubes, upon each of which is deposited a series of photoconductive rings capable of changing resistance when exposed to light.
- the rings on the glass light conducting tubes are then interconnected in the same manner as the photoconductive resistances utilized in the known light conducting cross-point matrix so that upon selective illumination of the proper tubes representing a pair of orthogonal lines of the matrix a complete path, which may be a speech path, is provided from the input to the output thereof.
- FIGURE 1 is a diagrammatic representation of a portion of a light controlled cross-point matrix of known configuration
- FIGURE 2 is a plan view, partly schematic, of the construction in accordance with the present invention of the partial cross-point matrix illustrated in FIGURE 1.
- a portion of a cross-point matrix illustrated therein includes ordinate lines 10 and 11 extending in the Y direction and abscissa lines 12 and 13 orthogonal thereto extending in the X direction.
- the lines 10, 11, 12 and 13 may form switching lines for electrical control or electrical scanning, or in the preferred embodiment may form speech transmission lines for connecting selective line circuits in a telephone communication system.
- the lines 10 and 11 are electrically insulated from the lines 12 and 13 at their cross points, as is common in the standard matrix configuration, with selectively controlled resistance paths provided between selective conductors at each of the cross-points to effect controlled interconnection of one of the ordinate lines with one of the abscissa lines.
- This resistive path in the light controlled cross-point matrix consists, for example, of photoconductive resistances YP3, XP2, YPZ and XP3- connected in series between the orthogonal conductors forming an individual cross point.
- the center point between the photoconductive resistors XP2 and YPZ is connected to ground through a parallel combination of photoconductive resistors YP1 and XP1.
- the photoconductive resistors are of the known type having high and low impedance states in their non-illuminated and illuminated conditions, respectively.
- At least a pair of light sources, and usually three light sources, must be provided at each coordinate or cross-point of the matrix to provide for full enabling or interconnection between an ordinate line and an abscissa line. That is, with a light source provided for association with the photoconductive resistances YPZ and YP3, a half enabling of the cross-point is effected. A complete enabling of the cross-point then requires a light source to be provided in conjunction with the photoconductive resistances XP2 and XP3.
- individual light sources are also provided in conjunction with the photoconductive resistaces YP1 and XPl which light sources are operated reciprocally with those associated with the serially connected resistances to provide for positive on and off conditions at the cross-points.
- FIGURE 2 of the drawing the construction in accordance with one embodiment of the instant invention simulating the partial matrix configuration of FIGURE 1 is illustrated. While it is apparent that a working cross point matrix would provide a greater number of ordinate and abscissa lines than illustrated forming a multitude of cross points, the simplified configuration of FIGURE 1 has been chosen for representing the construction of the instant invention in order to present a clear description and uncomplicated illustration of the features of the present invention. As this detailed description proceeds, it will be apparent that a mere duplication of the illustrated elements following the described principles of the invention will result in a full working matrix of the desired size.
- each of the lines of the matrix is provided with a pair of light conductive glass tubes which form a semi-common light source for each of the cross-points along that line.
- the light conducting glass tubes 10a and 10b in FIGURE 2 provide the light source for each of the YP photoconductive resistances connected to line 10 in FIG- URE l; the light conducting tubes 11a and 11b form the light source for each of the Y coordinate photoconductive resistors associated with the line 11; and, in a like manner, the photoconductive tubes 12a and 12b and the photoconductive tubes 13a and 13b form the light sources for the X coordinate photoconductive resistances associated with the line 12 and 13 respectively.
- the photoconductive resistances interconnecting the cross-points of the matrix are provided on the light conducting tubes in the form of rings of photoconductive material with one tube of the pair associated with each line, for example, tube 10a carrying the series connected resistances and the second tube of the pair for example, tube 10b carrying the parallel or shunting resistor which effects positive disabling of the connection.
- all of the Y coordinate photoconductive resistors associated with a coordinate line of the matrix at each cross-point with which that line is involved is formed as a ring of photoconductive material on one particular pair of light conducting tubes.
- the light conducting tubes are illuminated by individual light sources controlled by a separate light flip-flop 20, 21, 22 and 23 provided for each of the pairs of the tubes associated with lines 10, 11, 12 and 13.
- a separate light flip-flop 20, 21, 22 and 23 provided for each of the pairs of the tubes associated with lines 10, 11, 12 and 13.
- This alternate illumination is effected through use of the flipfiops controlling the individual light sources for each one of the complementary tubes of a given pair. Since one of the tubes of each pair carries only the series resistances, and the other tube carries only the shunt resistances, alternate illuminations of the tubes of each pair by the light flip-flops will provide the necessary on and off operation of each cross-point.
- each of the light flip-flops 20, 21, 22 and 23 will be in the reset state so that the second light conducting tube of each pair carrying the shunt resistances will be illuminated reducing the shunt impedances to their low impedance state.
- the point of connection between the photoconductive ring YP2 on light conducting tube 10a and photoconductive ring XP2 on photoconductive tube 13a is connected to the photoconductive ring YP1 on light conducting tube 101;, which ring is in turn connected to ground.
- this same point of connection between the photoconductive rings XP2 and YP2 is connected to photoconductive ring XP1 on light conducting tube 13b, which ring is in turn connected to ground. Illumination of the tubes 10b and 13b provide the shunt path through the photoconductive rings YP1 and XP1 to ground from the center point of the serially connected resistors.
- the photoconductive rings YQ3 and YQ2 thereon With the illumination of light conducting tube 10a the photoconductive rings YQ3 and YQ2 thereon will also be reduced to their low impedance state; however, no connection is effected between the line 10 and the line 12 in the matrix since the cross-point formed by these lines is only half enabled, the resistances XQ2 and XQ3 remaining in their high impedance state.
- the shunt resistance XQl is reduced to its low impedance state providing a shunting of the cross-point to prevent enabling thereof.
- the cross points all along lines 10 and 13 of the matrix will be half enabled with the exception of the cross-point formed by a combination of the two lines.
- enabling of the proper flip-flops will effectively provide a light path along selective ordinate and abscissa lines of the matrix so as to enable the cross-point at the point of intersection of the light paths.
- a cross-point switching matrix for use in telephone communication systems comprising:
- radiation signal control means connecting each input means to all of said output means for selectively effecting electrical interconnection between a single input means and a single output means
- said radiation signal control means including an individual pair of light conducting tubes associated with each input means and each output means and photoconductive means deposited on said light conducting tubes interconnecting individual input means and output means.
- pairs of light conducting tubes each include a first tube carrying photoconductive means connected in series between individual input and output means and a second tube carrying photoconductive means shunting to ground said series connection between individual input and output means.
- said light source means includes a pair of lamps and flip-flop means for alternately energizing said pair of lamps in response to external control.
- a device comprising at least one input line and a plurality of output lines in electrical isolation with said input line, individual light responsive means associated with each output line and with said input line including first and second photoconductive resistors connected in series interconnecting said output line with said input line for effecting electrical connection therebetween upon selective illumination thereof, first light means optically coupled to all of said first resistances and second light means optically coupled with respective ones of said second resistances, said first light means being in the form of a light conducting tube associated with a switchable light source.
- the device of claim 7 further including third photoconductive resistor means connected between the point of connection of each of said first and second resistances and ground, and third light responsive means optically coupled to said third resistance.
- the device of claim 7 further including a plurality of input lines, said individual light responsive means interconnecting each output line with each input line.
- said second light means is in the form of at least one light conducting tube and a switchable light source associated with all of the second resistor connected to a common output line.
- said first and second light means each further include at least one lamp for illuminating said respective light conducting tubes and flip-flop means for selectively energizing said lamps in response to external control.
- said third light responsive means includes a light conducting tube and a switchable light source associated with all of the third resistors of light responsive means connected to a common input line.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
Description
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US56715766A | 1966-07-22 | 1966-07-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3474415A true US3474415A (en) | 1969-10-21 |
Family
ID=24265954
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US567157A Expired - Lifetime US3474415A (en) | 1966-07-22 | 1966-07-22 | Light responsive switching matrix |
Country Status (2)
Country | Link |
---|---|
US (1) | US3474415A (en) |
DE (1) | DE1294462B (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3310681A (en) * | 1963-04-10 | 1967-03-21 | Franklin Institute | Optical filamentary photocell device having spaced electrical conductors arranged ina matrix |
US3360657A (en) * | 1964-11-25 | 1967-12-26 | Jr Bernard Edward Shlesinger | Light responsive cross bar switch |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1123369B (en) * | 1960-08-18 | 1962-02-08 | Standard Elektrik Lorenz Ag | Switchable pulse lock |
-
1966
- 1966-07-22 US US567157A patent/US3474415A/en not_active Expired - Lifetime
-
1967
- 1967-07-13 DE DEST27135A patent/DE1294462B/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3310681A (en) * | 1963-04-10 | 1967-03-21 | Franklin Institute | Optical filamentary photocell device having spaced electrical conductors arranged ina matrix |
US3360657A (en) * | 1964-11-25 | 1967-12-26 | Jr Bernard Edward Shlesinger | Light responsive cross bar switch |
Also Published As
Publication number | Publication date |
---|---|
DE1294462B (en) | 1969-05-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: GENERAL DYNAMICS TELEQUIPMENT CORPORATION Free format text: CHANGE OF NAME;ASSIGNOR:STROMBERG-CARLSON CORPORATION;REEL/FRAME:004157/0746 Effective date: 19821221 Owner name: GENERAL DYNAMICS TELEPHONE SYSTEMS CENTER INC., Free format text: CHANGE OF NAME;ASSIGNOR:GENERAL DYNAMICS TELEQUIPMENT CORPORATION;REEL/FRAME:004157/0723 Effective date: 19830124 Owner name: UNITED TECHNOLOGIES CORPORATION, A DE CORP. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GENERAL DYNAMICS TELEPHONE SYSTEMS CENTER INC.;REEL/FRAME:004157/0698 Effective date: 19830519 |
|
AS | Assignment |
Owner name: STROMBERG-CARLSON CORPORATION, FLORIDA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:UNITED TECHNOLOGIES CORPORATION A CORPORATION OF DE;REEL/FRAME:005732/0982 Effective date: 19850605 |