Methods and apparatus related to an optical lens for a led
AssigneeKoninklijke Philips N.V.
InventorLuc Guy Louis Lacroix
Life of this patent
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Abstract
Methods and apparatus for an optical lens (10, 110) suitable to provide an asymmetric light output pattern when utilized in combination with at least one LED. The optical lens (10, 110) may include a revolved section (20, 120) having and an extruded section (40, 140) extending from the end of the revolved section (20, 120). One or more surface features may optionally be applied to portions of the outer surface of the optical lens (10, 110).
Claims20
An asymmetric optical lens, comprising:
- a LED recess;
- an optical axis intersecting said LED recess;
- an extrusion axis perpendicular to said optical axis and intersecting said LED recess;
- a revolved section having an outer conical wall revolved partially about said optical axis, said outer conical wall surrounding a portion of said LED recess and configured to internally reflect and collimate a majority of light output incident thereon originating from said LED recess;
- wherein said outer conical wall form first and second sides which defines a first profile about said a optical axis A at an end thereof;
- an extruded section extending from said end of said outer conical wall including extruded sides and each having a profile as viewed along any point of said extrusion axis that substantially conforms to corresponding portions of said first and second sides of said outer conical wall forming said first profile.
An asymmetric optical lens placeable over at least one LED, comprising:
- an optical axis alignable with a light output axis of said LED;
- a revolved section provided approximately one-hundred-and-eighty degrees around said optical axis, said revolved section having an outer conical wall configured to internally reflect and substantially collimate a majority of light output incident thereon from said LED;
- wherein said outer conical wall defines a first profile at an end of said revolved section;
- a linear extrusion axis extending perpendicular to said optical axis and perpendicular to said first profile;
- an extruded section extending from said revolved section and around the remainder of said optical axis;
- wherein the profile of said extruded section as viewed along any point of said linear extrusion axis substantially conforms to corresponding portions of said first profile.
The lens of aim 8, wherein said first profile is a best fitting smooth spline.
A method of designing an asymmetric optical lens, comprising:
- determining a total internal reflection profile;
- rotating said total internal reflection profile approximately one hundred and eighty degrees about an optical axis;
- linearly extruding said total internal reflection profile from an end of said rotated total internal reflection profile;
- undercutting at least a portion of said extruded total internal reflection profile;
- and
- applying a predefined non-planar optical prescription on at least an upper surface of said rotated total internal reflection profile.
Dependencies are inferred from the claim text.