Title:
ELECTRONIC TIMEPIECE
Document Type and Number:
WIPO Patent Application WO/2024/090100
Kind Code:
A1
Abstract:
A control circuit 72 of an electronic timepiece 1 uses a third actuator 72c to control a moon phase disk rotation direction R, which is the direction of rotation of a moon phase disk 42, and a moon phase disk rotation position (moon phase disk step position S), which is the position of rotation of the moon phase disk 42. Upon determining that an operation to switch between a northern hemisphere display mode DN and a southern hemisphere display mode DS has been performed through an operation unit, the control circuit 72 causes the moon phase disk 42 to be rotationally driven in steps from a current moon phase disk rotation position (current moon phase disk step position SR) to a post-switching moon phase disk rotation position (post-switching moon phase disk step position SC) that is spaced from a reference moon phase MB by a reference moon phase difference MD in a direction away from a current moon phase MR, where the reference moon phase difference MD is a moon phase difference of the current moon phase MR based on the current moon phase disk rotation position (current moon phase disk step position SR) with respect to the reference moon phase MB. This makes it possible to reduce computational load on the control circuit during a switching operation regarding a hemisphere display mode of a moon phase display unit.
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Inventors:
HARAGUCHI DAISUKE (JP)
IGARASHI KAZUTAKA (JP)
IGARASHI KAZUTAKA (JP)
Application Number:
PCT/JP2023/034951
Publication Date:
May 02, 2024
Filing Date:
September 26, 2023
Export Citation:
Assignee:
CITIZEN WATCH CO LTD (JP)
International Classes:
G04C3/00; G04B19/26
Attorney, Agent or Firm:
TORANOMON INTELLECTUAL PROPERTY FIRM (JP)
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