US 12,386,314 B2
Monocristalline type mineral stone equipped with a cone for centring a pivot, and manufacturing method thereof
Bruno Besutti, Charquemont (FR); Sébastien Retrouvey, Chissey sur Loue (FR); and Pierry Vuille, Les Emibois (CH)
Assigned to Comadur SA, Le Locle (CH)
Appl. No. 17/629,209
Filed by Comadur SA, Le Locle (CH)
PCT Filed Jun. 26, 2020, PCT No. PCT/EP2020/068148
§ 371(c)(1), (2) Date Jan. 21, 2022,
PCT Pub. No. WO2021/018491, PCT Pub. Date Feb. 4, 2021.
Claims priority of application No. 19188642 (EP), filed on Jul. 26, 2019.
Prior Publication US 2022/0236693 A1, Jul. 28, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. B23K 26/382 (2014.01); B23K 26/0622 (2014.01); B23K 26/082 (2014.01); B23K 26/384 (2014.01); B23K 26/388 (2014.01); B23K 26/402 (2014.01); B28D 5/04 (2006.01); G04B 31/004 (2006.01); G04B 31/02 (2006.01); G04B 31/06 (2006.01); B23K 103/00 (2006.01); G04D 3/00 (2006.01)
CPC G04B 31/06 (2013.01) [B23K 26/0624 (2015.10); B23K 26/082 (2015.10); B23K 26/384 (2015.10); B23K 26/402 (2013.01); G04B 31/004 (2013.01); G04B 31/02 (2013.01); B23K 2103/50 (2018.08); B23K 2103/52 (2018.08); G04D 3/0071 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method for manufacturing a stone for a timepiece from a mineral body of a monocrystalline type, the stone comprising a hole, the method comprising:
ablating the body by scanning at least one face of the body with ultra-short pulse laser radiation from a laser for a duration less than one hundred picoseconds; and
guiding a beam of the laser radiation using a precession system of at least three axes configured to at least partially cancel a conical focusing angle of the laser, wherein
the ablating includes digging of a cone of entrance to the hole, and
the ablating is carried out layer by layer, each layer having a thickness comprised within an interval ranging from 1 to 10 μm.