# US 7,411,742 B1 · Focusing lens for LED > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,411,742 B1 - Document ID: US7411742B1 - Status: Granted - Kind: B1 - Application number: 11/690,866 - Filed: 2007-03-26 - Granted: 2008-08-12 - Earliest claimed: 2007-03-26 - Assignees: Sekonix Co., Ltd. - Inventors: Jin-Ho Kim; Shung-Hoon Hwang; Hee-Joong Lee - Web page: https://patentgrep.com/patent/US7411742B1 ## CPC - F21V 5/04: of lens shape - G02B 3/02: with non-spherical faces (G02B3/10 takes precedence) - G02B 19/0028: {refractive and reflective surfaces, e.g. non-imaging catadioptric systems} - G02B 19/0061: {the light source comprising a LED} - F21Y 2115/10: Light-emitting diodes [LED] - H10H 20/855: Optical field-shaping means, e.g. lenses - H10H 20/856: Reflecting means - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## 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. ## Claims ### Claim 1 A focusing lens for an LED, which concentrates light emitted from the LED so as to have directionality parallel to an optic axis, comprising: 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 an oval-shaped curved surface which extends 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. ### Claim 2 (depends on 1) The focusing lens as claimed in claim 1, wherein the plane of reflection sets a condition of total internal reflection. ### Claim 3 (depends on 1) The focusing lens as claimed in claim 1, wherein the plane of incidence is formed to slope to get progressively wider outward from the first aspheric lens surface towards an end of the plane of incidence. ### Claim 4 (depends on 1) The focusing lens as claimed in claim 1, wherein, when a radiation angle of an off-axis of the LED is 0° to 32°, the first aspheric lens surface is formed to have an emission angle of 0° to 21°, and the second aspheric lens surface is formed to have an emission angle of 0° to 3.5°. ### Claim 5 (depends on 2) The focusing lens as claimed in claim 2, wherein, when a radiation angle of an off-axis of the LED is 0° to 32°, the first aspheric lens surface is formed to have an emission angle of 0° to 21°, and the second aspheric lens surface is formed to have an emission angle of 0° to 3.5°. ### Claim 6 (depends on 3) The focusing lens as claimed in claim 3, wherein, when a radiation angle of an off-axis of the LED is 0° to 32°, the first aspheric lens surface is formed to have an emission angle of 0° to 21°, and the second aspheric lens surface is formed to have an emission angle of 0° to 3.5°. ### Claim 7 (depends on 4) The focusing lens as claimed in claim 4, wherein, when the radiation angle of an off-axis of the LED is 40° to 80°, the plane of incidence is formed to have an emission angle of 57° to 82°, the plane of reflection is formed to have an emission angle of 2° to 6°, and the plane of emission is formed to have an emission angle of 0.3° to 0.65°. ### Claim 8 (depends on 5) The focusing lens as claimed in claim 5, wherein, when the radiation angle of an off-axis of the LED is 40° to 80°, the plane of incidence is formed to have an emission angle of 57° to 82°, the plane of reflection is formed to have an emission angle of 2° to 6°, and the plane of emission is formed to have an emission angle of 0.3° to 0.65°. ### Claim 9 (depends on 6) The focusing lens as claimed in claim 6, wherein, when the radiation angle of an off-axis of the LED is 40° to 80°, the plane of incidence is formed to have an emission angle of 57° to 82°, the plane of reflection is formed to have an emission angle of 2° to 6°, and the plane of emission is formed to have an emission angle of 0.3° to 0.65°.