# US 12,001,044 B2 · Light emitting module and planar light source > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,001,044 B2 - Document ID: US12001044B2 - Status: Granted - Kind: B2 - Application number: 18/046,907 - Filed: 2022-10-14 - Published: 2023-04-20 - Granted: 2024-06-04 - Earliest claimed: 2021-10-15 - Assignees: Nichia Corporation - Applicants: Nichia Corporation - Inventors: Takuya Nakabayashi; Daisuke Iwakura; Yoichi Bando; Yasunori Shinomiya; Satoshi Yoshinaga - Web page: https://patentgrep.com/patent/US12001044B2 ## CPC - G02B 6/0021: {for housing at least a part of the light source, e.g. by forming holes or recesses} - G02B 6/0045: {by shaping at least a portion of the light guide} - G02B 6/0031: {Reflecting element, sheet or layer} - G02B 6/0055: {Reflecting element, sheet or layer} - G02B 6/0068: {Arrangements of plural sources, e.g. multi-colour light sources} - G02B 6/0078: {Side-by-side arrangements, e.g. for large area displays} - G02B 6/0083: {Details of electrical connections of light sources to drivers, circuit boards, or the like} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A light emitting module includes a light source, a light guide member, and first and second light reflective members. The light guide member is configured to transmit light from the light source. The light guide member having an upper surface and a lower surface opposite to the upper surface. The first light reflective member is arranged on a lower surface side of the light guide member. The first light reflective member has a lower surface. The first light reflective member includes a first resin, and a first reflective body having a refractive index higher than a refractive index of the first resin. The second light reflective member is arranged on a lower surface side of the first light reflective member. The second light reflective member includes a second resin, and a second reflective body having a refractive index lower than a refractive index of the second resin. ## Claims ### Claim 1 A light emitting module comprising: a light source; a light guide member configured to transmit light from the light source, the light guide member having an upper surface and a lower surface opposite to the upper surface, the light guide member defining a hole with the light source being arranged inside the hole; a first light reflective member arranged on a lower surface side of the light guide member, the first light reflective member having a lower surface, the first light reflective member including a first resin, and a first reflective body having a refractive index higher than a refractive index of the first resin; and a second light reflective member arranged on a lower surface side of the first light reflective member, the second light reflective member including a second resin, and a second reflective body having a refractive index lower than a refractive index of the second resin. ### Claim 2 (depends on 1) The light emitting module according to claim 1, wherein the first reflective body is titanium oxide. ### Claim 3 (depends on 1) The light emitting module according to claim 1, wherein the second reflective body is a gas. ### Claim 4 (depends on 1) The light emitting module according to claim 1, wherein the refractive index of the first resin is lower than a refractive index of the light guide member. ### Claim 5 (depends on 1) The light emitting module according to claim 1, wherein the first resin is one of an acrylic resin, a silicone resin, a urethane resin, and an epoxy resin. ### Claim 6 (depends on 1) The light emitting module according to claim 1, wherein the second resin is one of a polyethylene terephthalate resin, an olefin resin, an acrylic resin, a silicone resin, a urethane resin, and an epoxy resin. ### Claim 7 (depends on 1) The light emitting module according to claim 1, wherein a thickness of the second light reflective member is greater than a thickness of the first light reflective member. ### Claim 8 (depends on 1) The light emitting module according to claim 1, wherein in a plan view, the first light reflective member is positioned between the light source and a portion of an outer edge of the light guide member farthest from the light source. ### Claim 9 (depends on 1) The light emitting module according to claim 1, wherein the first light reflective member faces the lower surface of the light guide member and a lower surface of the light source. ### Claim 10 (depends on 1) The light emitting module according to claim 1, wherein the second light reflective member faces an entire lower surface of the first light reflective member. ### Claim 11 (depends on 1) The light emitting module according to claim 1, wherein the hole is a through hole extending from the upper surface to the lower surface of the light guide member. ### Claim 12 (depends on 1) The light emitting module according to claim 1, further comprising a third light reflective member arranged on a lower surface side of the second light reflective member, the third light reflective member including a third resin, and a third reflective body having a higher refractive index than the third resin. ### Claim 13 (depends on 12) The light emitting module according to claim 12, wherein a concentration of the third reflective body in the third light reflective member is higher than a concentration of the first reflective body in the first light reflective member. ### Claim 14 (depends on 12) The light emitting module according to claim 12, further comprising a fourth light reflective member arranged on an upper side of the light source, the fourth light reflective member including a fourth resin, and a fourth reflective body having a higher refractive index than the fourth resin. ### Claim 15 (depends on 14) The light emitting module according to claim 14, wherein a concentration of the first reflective body in the first light reflective member is lower than a concentration of the fourth reflective body in the fourth light reflective member. ### Claim 16 (depends on 1) The light emitting module according to claim 1, wherein the first light reflective member includes a plurality of light reflective particles constituting the first reflective body, the light reflective particles being dispersed in the first resin. ### Claim 17 (depends on 1) The light emitting module according to claim 1, wherein the light guide member further defines a light guide hole arranged between the hole and an outer edge of the light guide member in a plan view. ### Claim 18 (depends on 1) A planar light source comprising: the light emitting module according to claim 1; and a support member, wherein the first light reflective member and the second light reflective member are arranged between the support member and the light guide member. ### Claim 19 (depends on 1) The light emitting module according to claim 1, further comprising an additional light reflective member arranged on one of a lower surface side of the second light reflective member, and an upper side of the light source, the additional light reflective member including a resin material, and an additional reflective body having a higher refractive index than the resin material. ### Claim 20 (depends on 19) The light emitting module according to claim 19, wherein a concentration of the additional reflective body in the additional light reflective member is higher than a concentration of the first reflective body in the first light reflective member.