Microelectronics applied to an airborne photo data recorder

Apparatus superimposing information on aerial photographs (including time, latitude, longitude, altitude etc.) is described in some detail. An all-transistor version uses miniature cathode-ray tubes on which the information is displayed in a matrix of dots. The problems discussed include the use of miniature wide-band transformers to couple signals to the c.r.t. deflection plates, d.t.l. circuits for all the logic functions, and thick film circuits. The new system gives tenfold volume economy and fivefold weight reduction.