TIMEPIECE COMPRISING AN ASPHERIC LENS

TIMEPIECE COMPRISING AN ASPHERIC LENS

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...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: PERSEGUERS, Sébastien, CATHELINE, Adrien, JUNOD, Benoit
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
HOROLOGY
MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL
MECHANICALLY-DRIVEN CLOCKS OR WATCHES
PHYSICS
TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
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Beschreibung
Zusammenfassung: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:z⁡(r)=r2R⁡(1+1-(1-κ)⁢⁢r2R2)+α4⁢r4+α6⁢r6+...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.