Lens and lens system and uses thereof
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United States of America Patent
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Sep 26, 2017
Issued Date -
N/A
app pub date -
Apr 16, 2014
filing date -
Apr 16, 2014
priority date (Note) -
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Abstract
A lens has a front surface, a rear surface, a side surface extending between the front surface and the rear surface. The rear surface defines a rear-facing chamber. The front surface has a central surface and an edge surface connected in a surrounding manner with the central surface, and the edge surface extends between the central surface and the side surface. The lens is an axisymmetric body and defines a central axis. The lens cooperates with the LED light source or similar light source which are located at the central axis and can move within the chamber, to form a lens system, so as to achieve a high capacity factor of the emergent light emitted from the light source, and functions of collimating and focusing for the incident light. This lens system can be applied to a flashlight with the function of variable focus.
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