US4879450A
Expired / Lapsed
US
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Laser welding technique
Assignee: BA BUSINESS CREDIT Inc
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Filing: 1988-12-02
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Granted: 1989-11-07
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Expires: 2008-12-02
Abstract
Abstract A laser welding technique for joining two parts together, the parts having contacting faces which define an interfacial region. One part is permeable to a laser beam directed toward and focused on the interfacial region, the face of the other part having light-disruptive characteristics whereby when the beam impinges thereon, multiple internal reflections are produced within the interfacial region which trap the energy of the beam to generate sufficient heat to cause the parts to superficially melt and fuse.
Inventors
- 👤 Jean-Pascal Valentin
- 👤 Pierre Maitre
- 👤 Masahiro Kazahaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:52
CPC Classifications
B; B23; B23K; B23K26/00; B23K26/20; B23K26/21; B23K26/24; B23K26/244; B23K26/009; B23K26/18; B23K26/32; C; C03; C03B; C03B23/00; C03B23/20; C03B23/203; C03C; C03C27/00; C03C27/06; B23K2103/00; B23K2103/50; B23K2103/52; B29; B29C; B29C35/00; B29C35/02; B29C35/08; B29C35/0805; B29C2035/0822; B29C2035/0827; B29C65/00; B29C65/02; B29C65/14; B29C65/16; B29C65/1603; B29C65/1606; B29C65/1612; B29C65/1616; B29C65/1619; B29C65/1629; B29C65/1635; B29C65/1641; B29C65/1677; B29C65/168; B29C65/1683; B29C66/00; B29C66/70; B29C66/73; B29C66/733; B29C66/7336; B29C66/73361; B29C66/73365; B29C66/739; B29C66/7392; B29C66/73921; B29K; B29K2309/00; B29K2309/08; B29K2995/00; B29K2995/0037; B29K2995/0072
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
156 words
A laser welding technique for welding together without using brazing material two parts having complementary faces, one of the parts being transparent to a laser beam and having a face composed of minute cavities, the face of the other part having light disruptive characteristics, said technique comprising the steps of: (a) bringing the complementary faces of the parts together to create an interfacial region therebetween; and (b) projecting a laser beam through the transparent part in a direction substantially normal to the face thereof which complements the face of the other part and focusing the beam onto the interfacial region, the focused beam being intercepted by the light disruptive face of the other part and being scattered thereby into the cavities in the face of the transparent part to produce multiple internal reflections therein generating sufficient heat which is entrapped in the region to cause the parts at their complementary faces to superficially melt and fuse.
Claim 2
Dependent Claim
156 words
A laser welding technique for welding together without using brazing material two parts having complementary faces, one of the parts being transparent to a laser beam and having a face composed of minute cavities, the face of the other part having light disruptive characteristics, said technique comprising the steps of: (a) bringing the complementary faces of the parts together to create an interfacial region therebetween; and (b) projecting a laser beam through the transparent part in a direction substantially normal to the face thereof which complements the face of the other part and focusing the beam onto the interfacial region, the focused beam being intercepted by the light disruptive face of the other part and being scattered thereby into the cavities in the face of the transparent part to produce multiple internal reflections therein generating sufficient heat which is entrapped in the region to cause the parts at their complementary faces to superficially melt and fuse.
Claim 3
Dependent Claim
16 words
A technique as set forth in claim 1, wherein said one part is made of glass.
Claim 4
Dependent Claim
16 words
A technique as set forth in claim 1, wherein said other part is made of ceramic.
Claim 5
Dependent Claim
27 words
A technique as set forth in claim 1, wherein said disruptive characteristics are imparted to said other part by plating its face with a thin metal coating.
Claim 6
Dependent Claim
22 words
A technique as set forth in claim 1, wherein said disruptive characteristics are imparted to said other part by coarsening its face.
Claim 7
Dependent Claim
19 words
A technique as set forth in claim 1, wherein said beam is produced by a solid-state laser beam generator.
Claim 8
Dependent Claim
56 words
A technique as set forth in claim 1, wherein said one part is a circular glass diaphragm and said other part is a body section of a pressure transducer having a circular nest and an annular ridge surrounding the nest to provide a face which complements a face formed in the circular margin of the diaphragm.
Claim 9
Dependent Claim
27 words
A technique as set forth in claim 1, wherein said parts are welded together in a vacuum chamber to avoid gas expansion a a result of heating.
Claim 10
Dependent Claim
20 words
A technique as set forth in claim 1, wherein said parts being welded are held under compression in a vise.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |