US 11,927,916 B2
Watch component, watch movement and watch
Kazuyuki Miyashita, Shiojiri (JP)
Assigned to SEIKO EPSON CORPORATION, (JP)
Filed by Seiko Epson Corporation, Tokyo (JP)
Filed on Mar. 13, 2020, as Appl. No. 16/817,781.
Claims priority of application No. 2019-046905 (JP), filed on Mar. 14, 2019.
Prior Publication US 2020/0292991 A1, Sep. 17, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. G04B 1/16 (2006.01); B81C 3/00 (2006.01); G04B 13/02 (2006.01); G04B 15/14 (2006.01)
CPC G04B 1/16 (2013.01) [G04B 13/02 (2013.01); G04B 13/022 (2013.01); G04B 15/14 (2013.01); B81C 3/001 (2013.01); B81C 3/005 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A watch component configured for use in a watch, the watch component comprising:
a base member including a first surface and a second surface opposite the first surface, the base member being mainly composed of silicon and being shaped as the watch component; and
a light reflecting layer provided at the first surface of the base member, the light reflecting layer having a three-layer structure in which a first silicon oxide layer, a silicon layer, and a second silicon oxide layer are layered in this order,
wherein a maximum reflectance for light having a wavelength in a range from 400 nm to 780 nm, when the light is incident on the light reflecting layer at an incident angle of 0°, is 50% or greater.