Focusing lens for LED

Details Focusing lens for LED Focusing lens for LED

2007-03-26

2008-08-12

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S642000, C359S708000, C359S710000, C359S712000, C359S719000, C359S800000, C359S641000, C359S651000, C359S741000, C369S112010

Reexamination Certificate

active

07411742

ABSTRACT:
A focusing lens for an LED is provided. The focusing lens for an LED, which concentrates light emitted from the LED so as to have directionality parallel to an optic axis, comprises: a transparent body; a first lens part formed in the body; and a second lens part covering the first lens, and wherein the first lens comprises: first and second aspheric lens surfaces which are convex in different sizes and are formed on planes being symmetric to each other; and wherein the second lens comprise: a plane of incidence formed to protrude from an outer circumference of the second aspheric lens surfaces, the plane of incidence into which the LED is inserted and which is configured to allow the light emitted from the LED to be incident and refracted; a plane of reflection formed to have a convex curved surface which extend and slopes to be progressive wider from the plane of incidence towards the second aspheric lens surface, the plane of reflection which is configured to allow the light emitted from the LED to be totally reflected; and a plane of emission formed to have a concave curved surface which extends and slopes from the plane of reflection towards the second aspheric lens surface, the plane of emission which is configured to allow the light emitted from the LED to be refracted and emitted as light being parallel to the optic axis. The focusing lens minimizes a loss of the light emitted from the LED and maximally reduces an angle of the emitted light, to effectively illuminate a local region at a long distance.

REFERENCES:
patent: 5572367 (1996-11-01), Jung et al.
patent: 5777803 (1998-07-01), Ju et al.
patent: 7054074 (2006-05-01), Mizuno et al.

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