Heidler, K.K.HeidlerKunzelmann, S.S.KunzelmannLautenschlager, H.H.LautenschlagerJaeckle, R.R.Jaeckle2022-03-082022-03-081995https://publica.fraunhofer.de/handle/publica/303156An electronic clock has at least one pointer (14, 15) and a dial (22, 26) and a clock work (9) connected to an energy storage mechanism. The dial (26) is placed on the rear side of a fluorescent collector (22). The energy storage mechanism (11) is connected to a solar generator (23) whose solar cells are connected at least to one edge phase (27) of the fluorescent collector (22).de608621697patent1986-3621349