Method for producing airtight package by sealing a glass lid to a container

Patent metadata

Field	Value
Publication number	US-10607904-B2
Application number	US-201716078641-A
Country	US
Kind code	B2
Filing date	Feb 16, 2017
Priority date	May 23, 2016
Publication date	Mar 31, 2020
Grant date	Mar 31, 2020

Abstract

Provided is a method for producing an airtight package that can reduce thermal stress occurring in the inside of a glass lid due to irradiation with laser light to prevent occurrence of cracks and the like in the glass lid. A method for producing an airtight package in which a container 1 containing a device 5 mounted therein is sealed with a glass lid 3 includes the steps of: mounting the device 5 to an interior of the container 1; disposing a sealing material 6 between a frame 2 of the container 1 and the glass lid 3 and placing the glass lid 3 on top of the frame 2 of the container 1; and irradiating the sealing material 6 through the glass lid 3 with laser light while scanning the laser light along the frame 2 to melt the sealing material 6 by heat and form a sealing material layer, thus sealing the glass lid 3 and the frame 2 together with the sealing material layer, wherein irradiation with the laser light is started from an irradiation start point B, then performed by scanning the laser light a plural number of times all around along the frame 2, and then terminated at an irradiation end point C located ahead of the irradiation start point B in a direction of the scanning A.

First claim

The invention claimed is:

1. A method for producing an airtight package in which a container containing a device mounted therein is sealed with a glass lid, the method comprising the steps of:
mounting the device to an interior of the container;
disposing a sealing material between a frame of the container and the glass lid and placing the glass lid on top of the frame of the container; and
irradiating the sealing material through the glass lid with laser light while scanning the laser light along the frame to melt the sealing material by heat and form a sealing material layer, thus sealing the glass lid and the frame together with the sealing material layer,
wherein the step of irradiating the sealing material with the laser light is started from an irradiation start point, then performed by scanning the laser light a plural number of times all around along the frame, and then terminated at an irradiation end point located ahead of the irradiation start point in a direction of the scanning.

2. The method for producing an airtight package according to claim 1 , wherein a distance between the irradiation start point and the irradiation end point is equal to or more than a radius of an irradiation spot of the laser light.

3. The method for producing an airtight package according to claim 1 , wherein the scanning of the laser light is performed at a rate of irradiation of 0.1 to 100 times per second to the same point on the frame.

4. The method for producing an airtight package according to claim 1 , wherein a width of the sealing material in a direction substantially perpendicular to the direction of the scanning is 90% or less of a width of an irradiation spot of the laser light.

5. The method for producing an airtight package according to claim 1 , wherein the container is made of a ceramic, a glass-ceramic or a glass.

6. The method for producing an airtight package according to claim 1 , wherein the sealing material is made of a glass frit.

7. The method for producing an airtight package according to claim 1 , wherein the sealing material contains a low-expansion, refractory filler made of at least one selected from the group consisting of cordierite, willemite, alumina, a zirconium phosphate-based compound, zircon, zirconia, tin oxide, quartz glass, β-quartz solid solution, β-eucryptite, and spodumene.

8. The method for producing an airtight package according to claim 1 , wherein the sealing material contains a laser absorbing material made of at least one selected from the group consisting of a Cu-based oxide, a Fe-based oxide, a Cr-based oxide, a Mn-based oxide, and a composite oxide thereof.

9. The method for producing an airtight package according to claim 1 , wherein the plural number of times of scanning the laser light all around the frame is ten times or more.

Assignees

• Nippon Electric Glass Co

Inventors

• Oka Takuji
• Shiragami Toru

Classifications

• B23K2103/54

  Glass · CPC title

• C03C23/0025

  by a laser beam · CPC title

• B23K26/0853

  Devices involving movement of the workpiece in at least two axial directions, e.g. in a plane · CPC title

• B23K26/211

  with interposition of special material to facilitate connection of the parts · CPC title

• B23K2103/52

  Ceramics · CPC title