Title:
ELECTRONIC TIMEPIECE
Document Type and Number:
Japanese Patent JP3864107
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide an electronic timepiece capable of accurately detecting the residual quantity of a secondary battery to inform a user of it when quickly charging the secondary battery.
SOLUTION: In this electronic timepiece, kinetic energy generated by the user's motion is converted into electric energy which is outputted as output voltage from a generating coil 22 to charge a chemical reaction type secondary battery 42, and a timepiece circuit 70 is actuated using the charged energy of the secondary battery to display time. The charge of a secondary power supply is temporarily stopped by a switching means, and on the basis of the attenuation characteristic of detected voltage at this time, the remaining quantity of the secondary battery is detected to output a detection signal of the remaining quantity.
Inventors:
Yasuhiro Oshima
Joji Kitahara
Joji Kitahara
Application Number:
JP2002091431A
Publication Date:
December 27, 2006
Filing Date:
May 13, 1994
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
G04C3/14; G04C10/04; G01R31/36; G04C10/00; G04G19/00; G04G99/00; H01M10/48; H02J7/00; H02J7/32; (IPC1-7): G04C10/04; G01R31/36; G04C10/00; G04G1/00; H01M10/48; H02J7/00
Domestic Patent References:
| JP7306275A | ||||
| JP3160394A | ||||
| JP57201883A | ||||
| JP61211963A |
Attorney, Agent or Firm:
Yukio Fuse
Mitsue Obuchi
Mitsue Obuchi
Previous Patent: TRANSMITTED X-RAY DATA ACQUISITION APPARATUS AND X-RAY TOMOGRAPH
Next Patent: METHOD AND DEVICE FOR PROCESSING PRESS PART
Next Patent: METHOD AND DEVICE FOR PROCESSING PRESS PART