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...
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| creator | PERSEGUERS, Sébastien CATHELINE, Adrien JUNOD, Benoit |
| description | 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)+α4r4+α6r6+...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. |
| format | Patent |
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| language | eng ; fre ; ger |
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| subjects | 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 |
| title | TIMEPIECE COMPRISING AN ASPHERIC LENS |
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