# US 10,120,109 B2 · Light emitting device capable of reducing reflected light and changing a focused position of incident light > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,120,109 B2 - Document ID: US10120109B2 - Status: Granted - Kind: B2 - Application number: 15/630,950 - Filed: 2017-06-23 - Published: 2018-06-14 - Granted: 2018-11-06 - Earliest claimed: 2016-12-13 - Assignees: Lite-On Electronics (Guangzhou) Limited; Lite-On Technology Corporation - Applicants: Lite-On Electronics (Guangzhou) Limited; Lite-On Technology Corporation - Inventors: Ching-Tsung Ni; Tai-Jung Sung; Kuo-Hui Chang - Web page: https://patentgrep.com/patent/US10120109B2 ## CPC - G02B 5/001: {Axicons, waxicons, reflaxicons} - F21V 3/049: {Patterns or structured surfaces for diffusing light, e.g. frosted surfaces} - F21V 11/00: Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 (characterised by cooling arrangements F21V29/502) - F21V 13/02: Combinations of only two kinds of elements - F21V 17/04: the fastening being onto or by the light source - F21V 23/001: {the elements being electrical wires or cables} - H05B 33/04: Sealing arrangements {, e.g. against humidity} - F21W 2111/02: for roads, paths or the like - F21Y 2115/10: Light-emitting diodes [LED] - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - F21W: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS - 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 ## Abstract A light emitting device includes a casing, a light blocking member, and a light emitting unit. The light blocking member is disposed within the casing, and is adapted to block an ambient light incident into the casing. The light emitting unit is disposed within the casing. ## Claims ### Claim 1 A light emitting device, comprising: a casing; a light blocking member disposed within the casing, and is adapted to block an ambient light incident into the casing; and a light emitting unit disposed within the casing, wherein the light blocking member is a light shielding cap having an accommodation opening and a plurality of cavity structures disposed around the accommodation opening, each of the plurality of cavity structures blocks the ambient light incident into the casing in a multi-reflection manner, and the light emitting unit is disposed in the accommodation opening correspondingly. ### Claim 2 (depends on 1) The light emitting device as recited in claim 1, wherein a top-view shape of each of the plurality of the cavity structures comprises a polygon shape, a circular shape, an oval shape, or an irregular shape, and a ratio of a depth to a width of each of the plurality of the cavity structures fall in a range from 1 to 100. ### Claim 3 (depends on 1) The light emitting device as recited in claim 1, wherein a surface of the light blocking member is coated with a light absorbing material. ### Claim 4 (depends on 1) The light emitting device as recited in claim 1, wherein depths of the plurality of the cavity structures are identical or different. ### Claim 5 (depends on 1) The light emitting device as recited in claim 1, wherein a blocking angle of the light blocking member is greater than a light emitting angle of the light emitting unit. ### Claim 6 (depends on 1) The light emitting device as recited in claim 1, wherein the light blocking member comprises a first light shielding cap and a second light shielding cap, the first light shielding cap is assembled with the second light shielding cap, and the first light shielding cap is located between the second light shielding cap and the light emitting unit. ### Claim 7 (depends on 1) The light emitting device as recited in claim 1, further comprising: a Fresnel lens disposed on the light blocking member to straighten a beam emitted by the light emitting unit. ### Claim 8 (depends on 1) The light emitting device as recited in claim 1, wherein the light blocking member further comprises a light absorption grating, the light absorption grating is disposed on the light shielding cap and blocks the ambient light incident into the casing in an absorbent manner, the light shielding cap is located between the light absorption grating and the light emitting unit and blocks the ambient light incident into the casing in a multi-reflection manner. ### Claim 9 (depends on 8) The light emitting device as recited in claim 8, wherein the light shielding cap has an accommodation opening and a plurality of cavity structures disposed around the accommodation opening, each of the plurality of the cavity structures blocks the ambient light incident into the casing in a multi-reflection manner, the light emitting unit is disposed in the accommodation opening correspondingly. ### Claim 10 (depends on 8) The light emitting device as recited in claim 8, further comprising: a Fresnel lens disposed between the light shielding cap and the light absorption grating to straighten a beam emitted by the light emitting unit. ### Claim 11 (depends on 10) The light emitting device as recited in claim 10, wherein the light absorption grating comprises a plurality of light absorbing structures separated from one another and disposed on the Fresnel lens, a length and a width of each of the plurality of the light absorbing structures fall in a range from 10 mm to 300 mm, a thickness of each of the plurality of the light absorbing structures falls in a range from 0.1 mm to 10 mm, a number of the plurality of the light absorbing structures falls in a range from 2 sheets to 10000 sheets, an inclination angle of each of the plurality of the light absorbing structures with respect to the Fresnel lens falls in a range from 0 degree to 180 degree. ### Claim 12 (depends on 1) The light emitting device as recited in claim 1, wherein the casing comprises a front cover and a rear cover, the front cover is assembled with the rear cover and defines an accommodation space with the rear cover, the light blocking member and the light emitting unit are located in the accommodation space. ### Claim 13 (depends on 12) The light emitting device as recited in claim 12, wherein the front cover has a lens part, the ambient light enters the casing through the lens part. ### Claim 14 (depends on 12) The light emitting device as recited in claim 12, wherein the light blocking member and the light emitting unit are disposed on the rear cover of the casing. ### Claim 15 (depends on 14) The light emitting device as recited in claim 14, wherein the light blocking member is a light shielding cap, a first vertical distance is provided between a side of the light shielding cap relatively adjacent to the light emitting unit and the rear cover, a second vertical distance is provided between another side of the light shielding cap relatively distant to the light emitting unit and the rear cover, the second vertical distance is greater than the first vertical distance, and the light shielding cap is in a funnel shape. ### Claim 16 (depends on 12) The light emitting device as recited in claim 12, further comprising: at least one internal component disposed on the rear cover of the casing, wherein an orthographic projection of the light blocking member on the rear cover overlaps an orthographic projection of the internal component on the rear cover. ### Claim 17 (depends on 12) The light emitting device as recited in claim 12, wherein the light blocking member is disposed parallel to the rear cover. ### Claim 18 (depends on 17) The light emitting device as recited in claim 17, the light blocking member being a light shielding cap, the light emitting device further comprising: a plurality of supporting members disposed between the light shielding cap and the rear cover, so as to define a configuration space between the light shielding cap and the rear cover. ### Claim 19 (depends on 12) The light emitting device as recited in claim 12, wherein an internal surface of the front cover has a plurality of micro structures, the plurality of the micro structures are connected to one another.