US3880632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of joining optical glass parts
Assignee: Individual
•
Filing: 1973-08-30
•
Granted: 1975-04-29
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Expires: 1993-08-30
Abstract
Abstract A method of joining optical glass parts consisting in that the flat surfaces of the optical glass parts to be joined are polished to an accuracy of 0.5 interference fringe, thereafter a binding layer of silica (SiO2) is applied to one of the surfaces to be joined, and the optical glass parts are joined by optical contact and exposed to infrared radiation.
Inventors
- 👤 Galina Yakovlevna Podvigalkina
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:19
CPC Classifications
C; C03; C03C; C03C27/00; C03C27/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
A METHOD OF JOINING OPTICAL GLASS PARTS, COMPRISING THE STEPS OF: POLISHING THE FLAT SURFACES OF OPTICAL GLASS PARTS TO BE JOINED TO AN ACCURACY OF NO LESS THAN 0.5 INTERFERENCE FRINGE, APPLYING A BINDING LAYER IN THE FORM OF A FILM OF SILICA TO AT LEAST ONE OF SAID SURFACES OF SAID OPTICAL GLASS PARTS TO BE JOINED, JOINING SAID OPTICAL GLASS PARTS BY OPTICAL CONTACT AND EXPOSING THEM TO INFRARED RADIATION OF GRADUALLY INCREASING DENSITY.
Claim 2
Independent Claim
77 words
A METHOD OF JOINING OPTICAL GLASS PARTS, COMPRISING THE STEPS OF: POLISHING THE FLAT SURFACES OF OPTICAL GLASS PARTS TO BE JOINED TO AN ACCURACY OF NO LESS THAN 0.5 INTERFERENCE FRINGE, APPLYING A BINDING LAYER IN THE FORM OF A FILM OF SILICA TO AT LEAST ONE OF SAID SURFACES OF SAID OPTICAL GLASS PARTS TO BE JOINED, JOINING SAID OPTICAL GLASS PARTS BY OPTICAL CONTACT AND EXPOSING THEM TO INFRARED RADIATION OF GRADUALLY INCREASING DENSITY.
Claim 3
Dependent Claim
90 words
The method as claimed in claim 1, wherein said film of silica is applied by hydrolyzing vapors of silicon tetrachloride in an apparatus comprising an airtight chamber; a water-vapor diffuser disposed in said chamber and having a tapered shape with its bottom being provided with holes for letting water vapors out; a diffuser of silicon tetrachloride also disposed in said chamber and made in the form of an annular pipe surrounding said water-vapor diffuser, with through holes in a plane parallel to that of said bottom of said water-vapor diffuser.
Claim 4
Dependent Claim
46 words
The method as claimed in claim 1, wherein said optical glass parts to be joined are made from silicate glass, and said film of silica is applied thereto by etching said optical glass parts in an acid after they have been treated in an aqueous-alkaline solution.
Claim 5
Dependent Claim
27 words
The method as claimed in claim 1, wherein the thickness of said film of silica applied to said optical glass parts is from 1,000 to 2,000 A.
Claim 6
Dependent Claim
33 words
The method as claimed in claim 1, wherein said optical glass parts are exposed to said infrared radiation after they have been joined to heat them to a temperature of 150* to 250*C.
Claim 7
Dependent Claim
34 words
The method as claimed in claim 1, wherein use is made of infrared emitters with their infrared radiation energy maximum being in the energy range of optical radiation of said joined optical glass parts.
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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |