Watch crystal including a lens and manufacturing method for such a lens
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United States of America Patent
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Jun 18, 2002
Grant Date -
N/A
app pub date -
Mar 24, 1999
filing date -
Apr 2, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention concerns a watch crystal (1) made of hard mineral material, in particular a crystalline material such as corundum, sapphire or spinel, including a non-circular optical lens (4) shaped in the thickness of the material of the crystal. The lens is formed by machining and polishing a recess (5) preferably situated in the lower face (3) of the crystal. Its contour can have reentering angles, and can be for example rectangular. The machining is effected by means of a brush which hits the bottom of the recess with the addition of a polishing medium.
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Cited Art Landscape
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