# US 2014/0153285 A1 · Lighting Assembly with Defined Angular Output > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0153285 A1 - Document ID: US20140153285A1 - Status: Published application - Kind: A1 - Application number: 14/092,517 - Filed: 2013-11-27 - Published: 2014-06-05 - Earliest claimed: 2012-11-30 - Assignees: Rambus Delaware LLC - Applicants: Rambus Delaware LLC - Inventors: Robert M. Ezell - Web page: https://patentgrep.com/patent/US20140153285A1 ## CPC - G02B 6/0045: {by shaping at least a portion of the light guide} - G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces} - G02B 6/0038: {Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide} - G02B 6/0058: {varying in density, size, shape or depth along the light guide} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A lighting assembly includes a light guide and solid-state light emitters to edge-light the light guide, the light emitters arrayed along a transverse direction. The light guide includes two or more sets of optical elements of well-defined shape. Light output from the lighting assembly by the first and second set of optical elements have a first and a second light ray angle distribution, respectively. The optical elements are configured such that when measured in a plane perpendicular to the light guide and the transverse direction: 1) the first and second light ray angle distributions are significantly narrower than an omnidirectional output distribution; and 2) the peak of the second light ray angle distribution is displaced from the peak of the first light ray angle distribution. ## Claims ### Claim 1 A lighting assembly, comprising: a plurality of solid-state light emitters; a light guide comprising a light input edge adjacent the light emitters, a first major surface and a second major surface opposite the first major surface, a first set of optical elements of well-defined shape positioned at one of the major surfaces, and a second set of optical elements of well-defined shape positioned at one of the major surfaces, wherein light from the light emitters propagates in the light guide by total internal reflection at the major surfaces, light output from the lighting assembly by the first set of optical elements has a first light ray angle distribution and light output from the lighting assembly by the second set of optical elements has a second light ray angle distribution, the light emitters being arrayed along the light input edge in a transverse direction, and a measurement plane being defined to be perpendicular to the transverse direction and to the first major surface or the second major surface of the light guide; wherein: the first light ray angle distribution in the measurement plane is significantly narrower than an omnidirectional output distribution and the second light ray angle distribution in the measurement plane is significantly narrower than an omnidirectional output distribution; and a peak of the second light ray angle distribution in the measurement plane is displaced from a peak of the first light ray angle distribution in the measurement plane. ### Claim 2 (depends on 1) The lighting assembly of claim 1, wherein the first set of optical elements and the second set of optical elements are both positioned at the same one of the first major surface or the second major surface. ### Claim 3 (depends on 1) The lighting assembly of claim 1, additionally comprising a third set of optical elements of well-defined shape positioned at one of the major surfaces, light output from the lighting assembly by the third set of optical elements has a third light ray angle distribution; wherein: the third light ray angle distribution in the measurement plane is significantly narrower than an omnidirectional output distribution; a peak of the third light ray angle distribution in the measurement plane is displaced from a peak of the first light ray angle distribution in the measurement plane; and a peak of the third light ray angle distribution in the measurement plane is displaced from a peak of the second light ray angle distribution in the measurement plane. ### Claim 4 (depends on 1) The lighting assembly of claim 1, wherein at least one of the first light ray angle distribution or the second light ray angle distribution in the measurement plane has a full width at half maximum of less than 90°. ### Claim 5 (depends on 4) The lighting assembly of claim 4, wherein at least one of the first light ray angle distribution or the second light ray angle distribution in the measurement plane has a full width at half maximum of less than 45°. ### Claim 6 (depends on 1) The lighting assembly of claim 1, wherein a peak of the second light ray angle distribution in the measurement plane is displaced from a peak of the first light ray angle distribution in the measurement plane by 10° or more. ### Claim 7 (depends on 1) The lighting assembly of claim 1, wherein the optical elements of at least one of the first set or the second set are elongate in the transverse direction. ### Claim 8 (depends on 7) The lighting assembly of claim 7, wherein the optical elements of the first set comprise a first leading surface and a first trailing surface, the first leading surface being closer to the light input edge than is the first trailing surface for each of the optical elements. ### Claim 9 (depends on 11) The lighting assembly of claim 11, wherein the first leading surface and the first trailing surface intersect to form a ridge. ### Claim 10 (depends on 9) The lighting assembly of claim 9, wherein the ridge is arcuate and intersects the first major surface or the second major surface at which the optical element is positioned at its ends. ### Claim 11 (depends on 8) The lighting assembly of claim 8, wherein the first leading surface and the first trailing surface are connected by a first rounded surface that is tangential to the first leading surface and to the first trailing surface. ### Claim 12 (depends on 11) The lighting assembly of claim 11, wherein the rounded surface is arcuate and intersects the first major surface or the second major surface at which the optical element is positioned at its ends. ### Claim 13 (depends on 1) The lighting assembly of claim 1, wherein the optical elements of the first set are indentations in a first major surface or the second major surface of the light guide. ### Claim 14 (depends on 1) The lighting assembly of claim 1, wherein the optical elements of the first set are protrusions from the first major surface or the second major surface of the light guide. ### Claim 15 (depends on 1) The lighting assembly of claim 1, wherein: the optical elements of the first set are nominally identical to one another in shape, the optical elements of the second set are nominally identical to one another in shape, and the optical elements of the first set are different from the optical elements of the second set. ### Claim 16 (depends on 1) The lighting assembly of claim 1, wherein: each of the optical elements of the first set comprises a first leading surface and a first trailing surface, the first leading surface and the first trailing surface forming a first included angle; each of the optical elements of the second set comprises a second leading surface and a second trailing surface, the second leading surface and the second trailing surface forming a second included angle; and the first included angle differs from the second included angle. ### Claim 17 (depends on 16) The lighting assembly of claim 16, wherein the first included angle differs from the second included angle by 5° or more. ### Claim 18 (depends on 1) The lighting assembly of claim 1, wherein the optical elements of the first set are micro-optical elements. ### Claim 19 (depends on 1) The lighting assembly of claim 1, wherein light output from the lighting assembly has a combined light ray angle distribution, the combined light ray angle distribution being a combination of the first light ray angle distribution and the second light ray angle distribution, and the combined light ray angle distribution in the measurement plane is significantly narrower than an omnidirectional output distribution. ### Claim 20 (depends on 1) The lighting assembly of claim 1, wherein the lighting assembly is configured as one of an under-cabinet lighting fixture, an LED lamp, or a ceiling fixture.