| 摘要 |
<p>1,112,985. Crosspoint switches. STANDARD TELEPHONES & CABLES Ltd. 9 Aug., 1966, No. 35521/66. Heading H4K. [Also in Division H1] Crosspoint switch comprises a matrix of double injection diodes which are biased to a voltage level less than that required to make them conductive but are switched to their conductive state by incident light. The matrix of diodes may be formed on a common body of semi-conductor material (see Division H1). The light to turn on a diode may be derived by energizing the appropriate ones of an array of photo emitting diodes provided on one surface of a semi-conductor substrate which has the array of double injection diodes on its other surface or the light derived from an external source may be applied to the diode which is provided with a transparent or apertured electrode to allow the light access to the semiconductor material. Alternatively the light may be applied to the double injection diodes via light-conducting fibres, one end of each fibre being located adjacent a respective double injection diode and the other ends of the fibres being incorporated into a solid block of material. The end surfaces of the fibres incorporated in the block are coated with phosphor material and the block incorporated as the face of a cathode-ray tube. By appropriately indexing the cathode-ray beam the phosphor on the end of a fibre is caused to emit light which travels along the fibre to illuminate the respective double injection diode.</p> |
