Digital watch time setting system

Details Digital watch time setting system Digital watch time setting system

G - Physics

04

B

58/33

G04B 27/08 (2006.01) G04C 3/00 (2006.01)

Patent

CA 1041774

ABSTRACT OF THE DISCLOSURE: In digital watches including a timing circuit driven by a crystal controlled oscillator. The timing circuit provides drive signals for powering a digital time display. An updating and time setting circuit is provided to vary or adjust the time displayed by means of photo-responsive devices supplying, when actuated, a voltage signal to the timing circuit, then modifying the drive signals and thereby selectively varying the time set on the digital display. The photo-responsive devices may be photo- diodes, photo-transistors or photovoltaic cells. A plate is rotatably mounted on the casing back or side of the watch, which plate is provided with an opening to allow light rays to impinge upon one of the photo-responsive devices through a corresponding window provided in the watch casing, whenever the window and the opening are in registration.

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