| 摘要 |
935,366. Electroluminescent devices. WESTERN ELECTRIC CO. Inc. Oct. 27, 1960 [Nov. 16, 1959], No. 36879/60. Class 39 (1). [Also in Group XIX] The selected row and column conductors of an electroluminescent device 41 are subjected to different frequencies f1, f2, the resulting light being applied to a corresponding area 48 on a storage device with areas of differing opacity, the light passing through the storage device being applied to light-sensitive means 43 with an output 47 which is responsive only to the sum or difference of the said frequencies #1+#2 or #1-#2. A number of frequencies #2-#4 may be applied to different column conductors, Fig. 7, whereby several areas in a row may be read simultaneously at outputs 77-79. Specification 789,660 is referred to. |
