Watch component, watch movement and watch
For example, an escape gear wheel part as a watch component includes a base member including a first surface and a second surface opposite the first surface, the base member being mainly composed of silicon, 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.
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.
2. The watch component according to claim 1 , wherein an average thickness of the second silicon oxide layer is smaller than an average thickness of the first silicon oxide layer.
3. The watch component according to claim 1 , wherein an average thickness of the silicon layer is from 66 nm to 86 nm.
4. The watch component according to claim 2 , wherein an average thickness of the silicon layer is from 66 nm to 86 nm.
5. The watch component according to claim 1 , wherein an average thickness of the first silicon oxide layer is from 100 nm to 400 nm.
6. The watch component according to claim 2 , wherein the average thickness of the first silicon oxide layer is from 100 nm to 400 nm.
7. The watch component according to claim 3 , wherein an average thickness of the first silicon oxide layer is from 100 nm to 400 nm.
8. The watch component according to claim 1 , wherein a 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 is further provided at the second surface of the base member.
9. The watch component according to claim 2 , wherein a 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 is further provided at the second surface of the base member.
10. The watch component according to claim 3 , wherein a 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 is further provided at the second surface of the base member.
11. The watch component according to claim 1 , wherein a 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 is further provided at a side surface where the first surface and the second surface are coupled.
12. The watch component according to claim 2 , wherein a 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 is further provided at a side surface where the first surface and the second surface are coupled.
13. The watch component according to claim 3 , wherein a 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 is further provided at a side surface where the first surface and the second surface are coupled.
14. The watch component according to claim 1 , wherein the watch component is at least one selected from the group consisting of a barrel, a wheel, an escape wheel, an anchor, and a balance.
15. A method for manufacturing a watch component, the method comprising forming a light reflecting layer at a first surface of a base member including the first surface and a second surface opposite the first surface, the base member being mainly composed of silicon, 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.
16. The method for manufacturing a watch component according to claim 15 , wherein at least one of the first silicon oxide layer and the second silicon oxide layer is formed by a thermal oxidation method.
17. The method for manufacturing a watch component according to claim 15 , wherein the silicon layer is formed by a low-pressure CVD method.
18. A watch movement comprising the watch component according to claim 1 .
19. A watch comprising the watch component according to claim 1 .
20. 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 an average thickness of the silicon layer is from 66 nm to 86 nm.