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Watch having an analog and digital display

  • US 4,600,316 A
  • Filed: 10/10/1984
  • Issued: 07/15/1986
  • Est. Priority Date: 10/25/1983
  • Status: Expired due to Term
First Claim
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1. An electronic watch comprisinga time base arranged to provide a standard frequency signal;

  • indicating means arranged to display a first group of time information items in analog form, one of said indicating means being a minutes indicator;

    a stepping motor mechanically coupled to said indicating means;

    a control circuit arranged to supply drive pulses to the motor so as to effect displacement of said indicating means in response to time pulses provided by the divider circuit as well as to correcting pulses;

    a counting circuit likewise receiving time pulses from the divider circuit thereby to provide signals representing a second group of time information items of which at least one information item is included in said first group;

    an electro-optic display coupled to said counting circuit in order to display the second group of time information in digital form;

    manual control means; and

    a selecting and correcting logic circuit responsive to operation of said manual control means thereby to place the watch in different display modes for each of which a selected time information is displayed by said electro-optic display means, in different correction modes for each of which a displayed information item may be corrected through application by said logic circuit of correcting pulses to the counting circuit, said logic circuit likewise applying correcting pulses to the motor control circuit whenever the information to be corrected is common information to both groups, said common information being the minutes information and said minutes indicator normally advancing by n steps per minute, n being at all times greater than 1, in a manner to modify the analog and digital indications of said common information by the same quantity, and in a supplementary synchronization mode in which said common information is displayed by said electro-optic digital display and in which said logic circuit responds to an operation of the manual control means by applying correcting pulses only to the motor control circuit in order to enable bringing the analog indication into coincidence with the digital indication of said information, wherein the motor control circuit is adapted to bring said minutes indicator automatically to an integral minute indication at the moment of switching to the synchronization mode and in said mode to generate and to apply n successive drive pulses to the motor in response to each correcting pulse which said motor control circuit receives from the logic circuit.

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