Lens for extended light source and design methods thereof
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United States of America Patent
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Apr 28, 2020
Grant Date -
Dec 14, 2017
app pub date -
Jun 8, 2017
filing date -
Jun 10, 2016
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The present invention relates to the technical area of lens, particularly discloses a lens for focusing or collimating light emitted from an extended light source, which comprises a front surface facing towards the extended light source and a back surface facing away from the extended light source, wherein at least one of the surfaces comprises a central section and a plurality of annular sections concentrically surrounding the central section; and wherein each of the annular section corresponds to a small portion of the extended light source. A method of designing the above lens is also disclosed. Additionally, the present invention provides a cost-effective lens design with high precision and more particularly, a lens design which meets the transmittance requirement for extended light source.
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