# US 9,518,720 B2 · LED surface light-emitting device for easy shielding and manufacturing method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,518,720 B2 - Document ID: US9518720B2 - Status: Granted - Kind: B2 - Application number: 14/319,651 - Filed: 2014-06-30 - Published: 2014-10-16 - Granted: 2016-12-13 - Earliest claimed: 2011-12-30 - Assignees: Kmw Inc. - Applicants: Kmw Inc. - Inventors: Duk Yong Kim - Web page: https://patentgrep.com/patent/US9518720B2 ## CPC - F21V 15/00: Protecting lighting devices from damage (protection from thermal damage F21V29/00; gas-tight or water-tight arrangements F21V31/00) - F21K 9/20: Light sources comprising attachment means - F21K 9/90: Methods of manufacture - F21V 15/01: Housings, e.g. material or assembling of housing parts (F21V15/02 takes precedence {housings forming signs or letters G09F13/04}) - F21Y 2105/10: comprising a two-dimensional [2D] array of point-like light-generating elements - F21Y 2115/10: Light-emitting diodes [LED] - Y10T 29/49117: Conductor or circuit manufacturing - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR - 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 - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The present invention relates to an LED surface light-emitting device for easy shielding, and a manufacturing method thereof, and includes: an integrated type rear-surface case part having an accommodation space portion open toward the front surface portion thereof, wherein a substrate equipped with LEDs is accommodated in the accommodation space portion; a diffusion panel which covers the open front surface portion of the rear-surface case part, and diffuses light of the LEDs to be a surface light source; and a front-surface window frame, the rear surface of which is coupled to the boundary of the front surface portion of the rear-surface case part, with the diffusion panel located on the rear-surface case part. The present invention is configured as a single body without openings to prevent dust and insects from coming therein, and thus can prevent brightness from decreasing according to use. ## Claims ### Claim 1 An LED surface light-emitting device for easy shielding, comprising: an integral rear case (20) in which a substrate (10) to which LEDs (11) are mounted is accommodated in an accommodation space opened to a front side; a light dispersing panel (30) covering the opened front side of the rear case (20), for dispersing light of the LEDs (11) to form a surface light source; an integral front window frame (40) of which a rear surface is coupled to a periphery of a front surface of the rear case (20) while the light dispersing panel (30) is located on the rear case (20); and a power supply unit, wherein the rear case (2) includes: a plurality of reinforcing portions protruded from a rear side of the flat bottom surface to which the substrate (10) is fixed; and coupling supports (27) provided on the rear side of the flat bottom surface to which the substrate (10) is fixed, wherein portions of one surface of the power supply unit (50) is supported by coupling supports (27) and the reinforcing portions (24). ### Claim 2 (depends on 1) The device of claim 1, wherein the rear case (20) and the front window frame (40) are formed of a synthetic resin through injection-molding. ### Claim 3 (depends on 1) The device of claim 1, wherein the rear case (20) and the front window frame (40) are glossy and white-colored. ### Claim 4 (depends on 1) The device of claim 1, wherein the rear case (20) comprises a bending surface (21) bent from a periphery of a flat bottom surface to which the substrate (10) is fixed toward a front side, and a support surface (22) extending from an end of the bending surface (21) to an outside and coupled to the front window frame (40). ### Claim 5 (depends on 4) The device of claim 4, wherein the bending surface (21) is inclined such that it becomes wider as it goes upwards. ### Claim 6 (depends on 5) The device of claim 5, wherein the bending surface (21) is a flat surface or a curved surface. ### Claim 7 (depends on 4) The device of claim 4, wherein an accommodation recess (25) is provided along a circumference of the support surface (22) of the rear case (20), and the device further comprises an O-ring (26) inserted into the accommodation recess (25) to improve a sealing property when being coupled to the front window frame (40). ### Claim 8 The device of claim wherein heights of the coupling supports (27) and the reinforcing portions (24) are the same. ### Claim 9 (depends on 1) The device of claim 1, wherein a peripheral portion of a central opening (43) of the window frame (40) corresponds to a curved portion (44). ### Claim 10 (depends on 9) The device of claim 9, wherein the window frame (40) corresponds to a downward bending surface (41) inclined downwards as it goes from an opening (43) to an outside. ### Claim 11 (depends on 9) The device of claim 9, wherein a rear surface of the window frame (40) is provided with a plurality of reinforcing portions (42). ### Claim 12 (depends on 11) The device of claim 11, wherein the reinforcing portions (42) are provided at locations spaced apart from a circumference of the opening (43) by a predetermined distance to guide a coupling location of the rear case (20). ### Claim 13 (depends on 1) The device of claim 1, wherein the substrate is divided into two or more parts. ### Claim 14 A method of manufacturing an LED surface light-emitting device for easy shielding, the method comprising: a) manufacturing an integral rear case (20) formed of a synthetic resin through injection-molding to have a bending surface (21) provided on one side of a bottom surface thereof and a support surface (22) flatly extending from the bending surface to a side surface such that an accommodation space having an opened front side is formed, in which a plurality of reinforcing portions (24) and a plurality of coupling supports (27) are located on a rear surface thereof; b) manufacturing a front window frame (40) formed of a synthetic resin through injection-molding to have an opening (43) at a central portion thereof and integrally provided with a plurality of reinforcing portions (42) on a rear surface thereof, the size of the front window frame (40) being larger than the size of the rear case (20); c) preparing a light dispersing panel (30) for dispersing light such that light is emitted from a surface thereof; d) fixing a substrate (10) to which LEDs (11) are mounted at a predetermined interval within the accommodation space of the rear case (20); e) stacking the light dispersing panel (30) and the front window frame (40) on the support surface (22) of the rear case (20) in which the substrate (10) is accommodated, and fixing the rear case (20) and the front window frame (40) using a plurality of bolts while the light dispersing panel (30) is interposed between the rear case 20 and the front window frame (40); and f) locating the power supply unit (50) on the reinforcing portions (24) provided on the rear surface of the rear case (20) and the coupling support (27), and fixing the power supply (50) to the coupling support (27) using bolts. ### Claim 15 (depends on 14) The method of claim 14, wherein in step a), the rear case is injection-molded in a state in which coupling holes (23) are provided at locations thereof where the rear case and the front window frame are coupled to each other using bolts. ### Claim 16 (depends on 14) The method of claim 14, wherein in step a), the support surface of the rear case is integrally injection-molded in a state in which an accommodation recess 25 is formed along a circumference of the accommodation space, and is coupled to the front window frame in step f) while an O-ring (26) is accommodated in the accommodation recess (25). ### Claim 17 (depends on 14) The method of claim 14, wherein in step f), the rear case (20) is coupled to the front window frame (40) such that the reinforcing portions (42) of the front window frame (40) are located outside the rear case (20).