# US 12,002,723 B2 · Sealing lid formed from translucent material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,002,723 B2 - Document ID: US12002723B2 - Status: Granted - Kind: B2 - Application number: 16/967,207 - Filed: 2019-02-12 - Published: 2020-11-19 - Granted: 2024-06-04 - Earliest claimed: 2018-02-13 - Assignees: Tanaka Kikinzoku Kogyo K.K. - Applicants: Tanaka Kikinzoku Kogyo K.K. - Inventors: Hiroyuki Kusamori; Tomohiro Shimada; Takeshi Iribe; Noriyuki Kudo; Katsunao Tanaka - Web page: https://patentgrep.com/patent/US12002723B2 ## CPC - B23K 35/0222: {for use in soldering or brazing (B23K35/0205 takes precedence)} - H10W 76/17: characterised by their materials - B23K 1/0016: {Soldering of electronic components} - B23K 35/30: with the principal constituent melting at less than 1550°C - B23K 35/3013: {Au as the principal constituent} - C04B 37/026: {consisting of metals or metal salts} - C04B 37/045: {characterised by the interlayer used (C04B37/047 takes precedence)} - C04B 2237/125: based on noble metals, e.g. silver - C04B 2237/525: by heating - C04B 2237/592: whereby the interlayer is not continuous, e.g. not the whole surface of the smallest substrate is covered by the interlayer - C04B 2237/76: Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc - C04B 2237/84: Joining of a first substrate with a second substrate at least partially inside the first substrate, where the bonding area is at the inside of the first substrate, e.g. one tube inside another tube - H10H 20/852: Encapsulations - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 - C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract The present invention relates to a sealing lid for a package containing an optical element. For the sealing lid, a translucent material such as glass that can transmit light such as visible light is used. The present invention includes a lid main body made of the translucent material. The lid main body includes a joining region having a frame shape corresponding to an outer circumferential shape of the lid main body. A plurality of pieces of brazing material made of a eutectic alloy are fused on the joining region of the lid main body. An arrangement state of the brazing material includes aligning spherical pieces of brazing material continuously to form a frame shape along the joining region. ## Claims ### Claim 1 A sealing lid that is joinable to a package main body containing an optical element and that is for producing a package hermetically sealed, the sealing lid comprising a lid main body comprising a translucent material comprising one of glass, crystal, sapphire, silicon and germanium, wherein the package main body consists of a metal or a ceramic, wherein the lid main body comprises a joining region having a frame shape corresponding to an outer circumferential shape of the lid main body, the joining region being formed on a surface of the lid main body that is to be joined to the package main body, wherein a plurality of pieces of brazing material comprising a eutectic alloy are fused on the joining region of the lid main body, and wherein a material structure of a random cross section of the plurality of pieces of brazing material consisting of (a) a eutectic structure and (b) a single phase having an equivalent circle diameter of equal to or less than 5 μm. ### Claim 2 (depends on 1) The sealing lid according to claim 1, wherein the plurality of pieces of brazing material are continuously fused on the joining region to form a frame shape. ### Claim 3 (depends on 1) The sealing lid according to claim 1, wherein at least one of the plurality of pieces of brazing material has a substantially circular projected shape. ### Claim 4 (depends on 1) The sealing lid according to claim 1, wherein at least one of the plurality of pieces of brazing material has a shape index (L) that is equal to or larger than 0.9 and equal to or less than 2.5, the shape index (L) being defined by a formula: shape index(Is)=A1/2/V1/3 [Formula 1] where A represents a joining area between the lid main body and the brazing material (mm2), and V represents a volume of the brazing material (mm3). ### Claim 5 (depends on 1) The sealing lid according to claim 1, wherein the brazing material comprising the eutectic alloy is a Au-based eutectic brazing material. ### Claim 6 (depends on 1) The sealing lid according to claim 1, wherein the brazing material comprising the eutectic alloy is a Au—Sn brazing material. ### Claim 7 (depends on 1) The sealing lid according to claim 1, wherein a metallized film comprising at least one layer comprising metal is provided on at least a part of the lid main body surface, and the brazing material is fused on the metallized film. ### Claim 8 (depends on 7) The sealing lid according to claim 7, wherein the metallized film comprises a first metal layer comprising at least one of Au and Pt on a brazing material fused surface of the metallized film. ### Claim 9 (depends on 7) The sealing lid according to claim 7, wherein the metallized film comprises a second metal layer comprising at least one of Mg, Al, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Zr, Nb, Mo, Ru, Rh, Pd, Ag, In, Sn, Sb, Ta, W, Re, Os, and Ir on a surface of the lid main body. ### Claim 10 (depends on 7) The sealing lid according to claim 7, wherein a diffusion region formed by diffusion of a metal element of the metallized film into the brazing material has a width of equal to or less than 2 μm. ### Claim 11 (depends on 1) The sealing lid according to claim 1, wherein the lid main body comprises a function film on one surface or both surfaces of the lid main body, the function film being for increasing transmittance or reflectance. ### Claim 12 (depends on 1) A hermetic sealing method comprising joining a sealing lid to a package main body, wherein the sealing lid joined is the sealing lid according to claim 1. ### Claim 13 (depends on 1) A package comprising the sealing lid according to claim 1. ### Claim 14 (depends on 2) The sealing lid according to claim 2, wherein at least one of the plurality of pieces of brazing material has a substantially circular projected shape. ### Claim 15 (depends on 2) The sealing lid according to claim 2, wherein at least one of the plurality of pieces of brazing material has a shape index (L) that is equal to or larger than 0.9 and equal to or less than 2.5, the shape index (L) being defined by a formula: shape index(Is)=A1/2/V1/3 [Formula 1] where A represents a joining area between the lid main body and the brazing material (mm2), and V represents a volume of the brazing material (mm3). ### Claim 16 (depends on 1) The sealing lid according to claim 1, wherein the translucent material is glass. ### Claim 17 (depends on 1) The sealing lid according to claim 1, wherein the package main body consists of a ceramic.