Patent · US Active

Optical device for a timepiece

US11449011B2 · kind B2 · utility

0Cited by

5References

20Claims

0Family size

Assignee

ROLEX SA · CH

Inventors

Adrien Catheline · Saint-Julien-en-Genevois, FR
Benoit Junod · Bonneville, FR
Sébastien Perseguers · Carouge, CH

Key dates

Filing date	May 22, 2019
Grant date	Sep 20, 2022
Priority date	—
Expiry date	Jul 15, 2041

Classification

Technology area (CPC G)Physics
CPC primaryG04B39/004
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A timepiece glass, in particular a watch glass, wherein it comprises an optical device comprising at least one lens intended to enlarge an indication supplied by a timepiece, said lens comprising at least one aspherical face comprising at least one section passing through a vertical plane comprising an optical axis of vertical direction z, of which at least one outline can be defined by the following equation: in which R is the nominal radius of curvature, k is the constant of conicity, and α(4,6, . . . ) is or are coefficient(s) of asphericity, and in which at least the constant of conicity k and/or at least one coefficient of asphericity is different from zero.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.