公开(公告)号：US10067480B2

公开(公告)日：2018-09-04

申请号：US15035691

申请日：2014-10-17

Applicant: SEIKO INSTRUMENTS INC.

Inventor： Kenji Ogasawara ,  Akira Takakura ,  Kazumi Sakumoto ,  Tamotsu Maesawa ,  Kazuhiro Koyama ,  Tomohiro Ihashi ,  Kosuke Yamamoto ,  Ayumi Matsumoto

IPC: G04R20/26 ,  G04C9/00 ,  G04C10/02 ,  G04G5/00 ,  G04G19/00

Abstract: An electronic device includes at least an acquisition unit, an input unit, a time correction amount calculation unit, and a transmitting unit. A timepiece includes at least a receiving unit, a power storage unit, a drive unit, and a control unit. The input unit receives an input of the time displayed by the display unit of the timepiece. The time correction amount calculation unit calculates a time correction amount for correcting the time of the timepiece from a difference between the time, the input of which is received by the input unit and the current time acquired by the acquisition unit. The transmitting unit transmits the time correction amount to the timepiece by using light. The receiving unit receives the time correction amount. The power storage unit stores electricity by using power converted from the light. The drive unit drives the indicating hand. The control unit corrects the time displayed by the indicating hand, based on the time correction amount received by the receiving unit. The control unit controls a power storage period in the power storage unit and a receiving period in the receiving unit so as to receive the time correction amount in the receiving period.

公开(公告)号：US09941733B2

公开(公告)日：2018-04-10

申请号：US14896474

申请日：2014-09-03

Applicant: SEIKO INSTRUMENTS INC.

Inventor： Kenji Ogasawara ,  Akira Takakura ,  Tamotsu Maesawa ,  Kazuhiro Koyama

IPC: H04B10/114 ,  H02J7/35 ,  G04G19/00 ,  H04L29/08 ,  H02S10/20 ,  G04C10/02 ,  G04G21/04 ,  H02S40/38 ,  G04G21/00 ,  H02J7/00 ,  H04L7/00 ,  H02J1/06

CPC classification number: H02J7/35 ,  G04C10/02 ,  G04G19/00 ,  G04G21/00 ,  G04G21/04 ,  H02J1/06 ,  H02J7/0031 ,  H02J7/0052 ,  H02J7/007 ,  H02J7/0081 ,  H02J2007/0037 ,  H02J2007/0095 ,  H02S10/20 ,  H02S40/38 ,  H04B10/114 ,  H04L7/0075 ,  H04L29/08

Abstract: An electronic device includes a solar cell, a secondary battery that is charged by the solar cell, and a control circuit that switches between a charging period during which the charging of the secondary battery from the solar cell is performed and a communication period during which an optical signal is received by the solar cell. The optical signal includes a synchronization signal indicating the transmission of data and the data, and the communication period is configured to detect the synchronization signal. The control circuit extends the communication period to enable the solar cell to receive the whole data included in the optical signal.