US 9,811,055 B2
Timepiece
Takumi Oshio, Guangdong (CN)
Assigned to Seiko Epson Corporation, Tokyo (JP)
Filed by SEIKO EPSON CORPORATION, Tokyo (JP)
Filed on Feb. 14, 2013, as Appl. No. 13/767,504.
Claims priority of application No. 2012-073043 (JP), filed on Mar. 28, 2012.
Prior Publication US 2013/0258821 A1, Oct. 3, 2013
Int. Cl. G04B 1/00 (2006.01); G04C 3/00 (2006.01); G04B 25/00 (2006.01); G04C 17/00 (2006.01); G04B 19/00 (2006.01); G04B 19/04 (2006.01); G04B 19/06 (2006.01); H01L 31/042 (2014.01); H02N 6/00 (2006.01); H01L 31/00 (2006.01); G04C 10/02 (2006.01); G04B 19/10 (2006.01); G04B 19/08 (2006.01); H01L 31/0236 (2006.01); H01L 31/048 (2014.01); G04G 17/04 (2006.01)
CPC G04C 10/02 (2013.01) [G04B 19/08 (2013.01); G04B 19/10 (2013.01); G04G 17/045 (2013.01); H01L 31/0236 (2013.01); H01L 31/042 (2013.01); H01L 31/048 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A timepiece comprising:
a dial plate having a front surface and a rear surface; and
a solar battery disposed on a rear side of the timepiece with respect to the rear surface of the dial plate such that the front surface of the dial plate faces away from the solar battery,
wherein the dial plate has grooves or ridges on the rear surface of the dial plate, and
the grooves or the ridges have portions where inclination angles with regard to a normal line of the dial plate are different such that light transmitted through the grooves or the ridges of the dial plate is incident on the solar battery from a plurality of directions with angles which are different from each other and wherein each of the grooves are defined between a radially inside surface and a radially outside surface, an inclination angle of each of the radially inside surfaces with respect to the normal line of the dial plate being smaller than an inclination angle of respective one of the radially outside surfaces with respect to the normal line of the dial plate.