| 摘要 |
840,956. Photo-cell circuits. NATIONAL CASH REGISTER CO. Jan. 22, 1959 [Jan. 23, 1958], No. 2361/59. Class 40(3). [Also in Groups XL(a) and XL(c)] Fig. 1 shows a switching matrix for selectively connecting rows 43, 44, 45 to columns 40, 41, 42 the junctions between which are provided by photo-emissive elements such as 46 associated with each column and optically coupled to photoconductive elements such as 47 each of which is associated with a row. If, for example, an alternating current signal derived from the secondary of transformer 56 is applied to column 40 by closing switch 50 the associated photo-emissive units 46-90 will cause the associated photoconductive units such as 70 to pass to their low impedance condition so that if an input signal is applied to row 45 by closing switch 55 an output signal appears across load resistor 79 and may be derived between terminals 82, 83. Thus by selective energization of given rows and columns output signals may be derived from any given photoconductive device. The matrix may function as a logical circuit, Fig. 4 (not shown), various combinations of input signals being associated with other combinations of output signals. Fig. 3 shows a switching device having three sets of input conductors and a plurality of planes containing the optical coupling elements. If for example input signals are applied to conductor 98 and to one of the conductors 95 or 103. both electro-luminescent elements 101, 108 will be optically coupled to photo-conductive cell 102 radiation from either of the elements being sufficient to produce an output signal on the terminal 102a so that the circuit functions as an OR gate, an output being produced when an input signal is applied at the same time to terminal 121 and either of terminals 120, 122. Alternately, the circuit could function as an AND gate in which the output is obtained only when input signals are supplied to all three of the input conductors. |
