| 摘要 |
1510040 Electronic timepieces SUWA SEIKOSHA KK 2 April 1976 [17 April 1975] 13459/76 Heading G3T An electronic timepiece includes a solar battery 1, Figs. 1 and 3, a primary battery (e.g. silver or mercury) connected to be charged by the solar battery via a circuit including a transistor 16 controlled by a transistor 18 through an amplifier 17 so as to prevent overcharging of the primary battery. Transistor 18 detects the battery voltage. A predetermined potential equal to the battery 20 voltage at the end of its useful life, may be set on potentiometer 19, and by means of an output 22 an indication of battery life may be displayed. The battery 20 is the supply source of a crystal oscillator controlled timekeeping circuit 21. In Fig. 1, a solar battery comprising serially connected cells, is connected to a printed circuit board 3 via a conductive rubber and adhesive layer 2. The layer 2 may be cobalt powder mixed with adhesive, a magnetic field being applied so that the cobalt powder is orientated in a given direction, whereby the layer will conduct across its thickness only. Electrical conductors 3a, 3b on the board resiliently engage spring contacts 4a, 4b which connect to a primary battery 4e, to an integrated circuit 4c and to a quartz crystal 4d. A back cover 5 of a case (not shown), has a projection engageable with the primary battery 4e. The solar battery also forms the dial of the timepiece, as illustrated, Figs. 5 and 6 (not shown).
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