US4670338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mirror foamed glass substrate and method of manufacture
Assignee: Centre National de la Recherche Scientifique
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Filing: 1985-12-18
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Granted: 1987-06-02
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Expires: 2005-12-18
Abstract
Abstract A mirror substrate, in particular for use in astronomical optics, comprises two symmetrical preformed plates of glass (10, 12) glued by their respective inside faces (26, 28) on either side of an intermediate structure (14), the outside face (38) of one of the plates (10) being suitable for subsequently receiving a reflecting coating. The intermediate structure (14) is a composite structure made of glass foam which is substantially uniform in nature, and in the preferred embodiments it comprises a central core (16) of glass foam together with two sets (18 and 20) of blocks of glass foam.
Inventors
- 👤 Alain Clemino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:38
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B7/00; G02B7/18; G02B7/182; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1089; Y10T156/1092; Y10T156/1093; Y10T428/00; Y10T428/16; Y10T428/163; Y10T428/164; Y10T428/166; Y10T428/18; Y10T428/183; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249969; Y10T428/249976; Y10T428/249977; Y10T428/249981; Y10T428/249982; Y10T428/249987; Y10T428/24999
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
147 words
A mirror substrate, in particular for precision optics, the substrate comprising two symmetrical plates of preformed glass which are glued by their respective inside faces on either side of an intermediate structure, wherein the outside face of one of the two plates is suitable for being treated to receive a reflecting coating, and wherein said intermediate structure is a substantially uniform composite structure built up from glass foam which comprises a central core made of glass foam and having two opposite parallel faces, a first set of blocks of glass foam each glued both to the inside face of one of said glass plates and to one of said faces of the central core, and a second set of blocks of glass foam each glued to the inside face of the other of said glass plates and to the other of said faces of the central core.
Claim 2
Dependent Claim
147 words
A mirror substrate, in particular for precision optics, the substrate comprising two symmetrical plates of preformed glass which are glued by their respective inside faces on either side of an intermediate structure, wherein the outside face of one of the two plates is suitable for being treated to receive a reflecting coating, and wherein said intermediate structure is a substantially uniform composite structure built up from glass foam which comprises a central core made of glass foam and having two opposite parallel faces, a first set of blocks of glass foam each glued both to the inside face of one of said glass plates and to one of said faces of the central core, and a second set of blocks of glass foam each glued to the inside face of the other of said glass plates and to the other of said faces of the central core.
Claim 3
Dependent Claim
43 words
A mirror substrate according to claim 1, wherein the blocks of said first and second sets of blocks are disposed side by side and are glued only to one of the glass plates and to one of the faces of the central core.
Claim 4
Dependent Claim
57 words
A mirror substrate according to claim 2, wherein the blocks are in the shape of generally rectangular parallelepipeds having one face prepared to be suitable for gluing to the inside face of one of the plates of glass and having an opposite face prepared to be suitable for gluing to a prepared face of the central core.
Claim 5
Dependent Claim
51 words
A mirror substrate according to claim 3, wherein a cement/glue type coating is applied to said prepared faces of the blocks and to said prepared faces of the central core, and wherein said prepared faces are suitably worked, once the coating has set, in order to obtain an accurately plane surface.
Claim 6
Dependent Claim
43 words
A mirror substrate according to claim 1, wherein a glue which is plastic in nature, such as an epoxy type glue having thixotropic characteristics, is used to glue the blocks of glass foam to the inside faces of the two plates of glass.
Claim 7
Dependent Claim
31 words
A mirror substrate according to claim 5, wherein the inside faces of the two plates of glass are previously treated by means of an abrasive to improve adhesion of the glue.
Claim 8
Dependent Claim
33 words
A mirror substrate according to claim 1, wherein a polymerizable glue, such as an epoxy type glue, is used to glue the blocks of glass foam to the faces of the central core.
Claim 9
Dependent Claim
34 words
A mirror substrate according to claim 1, wherein the glass foam of the intermediate structure is a material having closed bubbles or cells, and having a density lying in the range 0.10 to 0.15.
Claim 10
Independent Claim
115 words
A method of manufacturing a mirror substrate, in particular for precision optics, comprising the steps of: providing a central core made of glass foam and having two opposite parallel faces; gluing a first set of blocks of glass foam to one of said faces of the central core, and a second set of blocks of glass foam to the other of said faces of the central core; and gluing an inside surface of a first of two symmetrical plates of preformed glass to said first set of blocks of glass foam, and an inside surface of a second of said two symmetrical plates of preformed glass to said second set of blocks of glass foam.
Claim 11
Independent Claim
115 words
A method of manufacturing a mirror substrate, in particular for precision optics, comprising the steps of: providing a central core made of glass foam and having two opposite parallel faces; gluing a first set of blocks of glass foam to one of said faces of the central core, and a second set of blocks of glass foam to the other of said faces of the central core; and gluing an inside surface of a first of two symmetrical plates of preformed glass to said first set of blocks of glass foam, and an inside surface of a second of said two symmetrical plates of preformed glass to said second set of blocks of glass foam.
Claim 12
Dependent Claim
59 words
A method according to claim 9, wherein the two sets of glass foam blocks are initially glued to the respective inside faces of the two plates of glass, and wherein the two sets of glass foam blocks are subsequently glued to the respective faces of the central core after the initial glue has set and fixed the blocks together.
Claim 13
Dependent Claim
55 words
A method according to claim 10, wherein each of the two sets of blocks are cut out from a thick plate of glass foam, one of whose faces is previously prepared in order to match the curvature of the inside face of the glass plate to which said set of blocks is to be glued.
Claim 14
Dependent Claim
90 words
A method according to claim 11, including placing the individual blocks cut out in this manner side by side and in contact with one another on the respective inside faces of the two plates of glass, wherein the opposite faces of each of the individual blocks are prepared so that each set of blocks presents an accurately plane gluing surface, the opposite faces of the central core are prepared in like manner, and the plane faces of the sets of blocks are glued to respective faces of the central core.
Claim 15
Dependent Claim
48 words
A method according to claim 11, wherein the faces of the blocks of glass foam and the faces of the central core are prepared by applying a cement/glue type of coating thereto, and by working said coating, after it has set, in order to obtain a plane surface.
Claim 16
Dependent Claim
46 words
A method according to claim 9, wherein the blocks of glass foam are glued to the inside faces of the two plates of glass by means of a glue which is plastic in nature, such as an epoxy type of glue which is thixotropic in character.
Claim 17
Dependent Claim
33 words
A method according to claim 14, wherein the inside faces of the two plates of glass are treated using an abrasive prior to gluing in order to improve adhesion of the glue thereto.
Claim 18
Dependent Claim
33 words
A method according to claim 9, wherein the blocks of glass foam are glued to the faces of the central core by means of a polymerizable glue, such as an epoxy type glue.
Claim 19
Dependent Claim
48 words
A method according to claim 12, wherein the faces of the blocks of glass foam and the faces of the central core are prepared by applying a cement/glue type of coating thereto, and by working said coating, after it has set, in order to obtain a plane surface.
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USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1990-06-01 | 1990-12-01 | 1991-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-01 | 1994-12-01 | 1995-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-01 | 1998-12-01 | 1999-06-02 | $7700.00 | Window Closed / Lapsed |