EP0119048A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Cathode ray tube display filter and method of manufacture and attachment to display face
Assignee: Unisys Corp
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Filing: 1984-03-05
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Granted: —
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Expires: 2004-03-05
Abstract
Abstract A contrast enhancement filter (11) for cathode ray tubes (CRT) is manufactured by stretching a preformed elastomeric gasket (15) about the peripheries of a pair of glass sheets (22, 23), the gasket having peripheral exterior lips (61) for capturing the sheets (22, 23) and an interior bead (16) separating the glass sheets to a spacing predetermined by the filter transmittance requirements. The spacing is filled with a dyed epoxy material having the required optical pass bands of the CRT phosphors. A similar elastomeric gasket (50) is stretched around the edges of the cured filter assembly (11), the gasket (50) having a similar exterior lip (63) for capturing the filter assembly (11) and an interior bead (53) separating the filter interior surface from the CRT faceplate and an interior CRT faceplate and receiving surface. A rigid frame (36, 37, 38) compresses the elastomeric gasket (50) about the filter assembly (11) and CRT faceplate end and the space between the filter interior surface and the CRT faceplate is filled with an optically clear epoxy material and cured. The rigid frame (36,37,38) is used as a critical element of the elastomeric gasket.
Inventors
- 👤 Stephen Christopher Maggio
- 👤 J. Robert Trimmier
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 20:53
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/86; H01J29/89; H01J29/896; H01J2229/00; H01J2229/89; H01J2229/8913; H01J2229/8922
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
176 words
Apparatus for bonding at least two rigid elements of a cathode ray tube display faceplate and cooperating contrast enhancement filter assembly, said elements having peripheral edges requiring precise coalignment and predetermined relative spacing therebetween, characterised in that the apparatus comprises a peripheral gasket (15; 50) moulded from an elastomeric material and having at least one exterior, inwardly-projecting peripheral lip (61; 63) and an interior inwardly-projecting peripheral bead (16; 53) of predetermined thickness, thereby to form at least one interior peripheral groove in the gasket, the elastomeric gasket having a cross-sectional thickness such,that it is deformable and stretchable about the peripheral edges of the rigid elements (22, 23; 11) with the peripheral edges of at least one of the elements in the groove and the peripheral edges of the other of the elements abutting the interior bead whereby to form an interior chamber of predetermined thickness between the elements, the gasket including an opening communicating (12) between said chamber and the exterior of the gasket for receiving a bonding material for bonding the elements (22, 23) together.
Claim 2
Dependent Claim
176 words
Apparatus for bonding at least two rigid elements of a cathode ray tube display faceplate and cooperating contrast enhancement filter assembly, said elements having peripheral edges requiring precise coalignment and predetermined relative spacing therebetween, characterised in that the apparatus comprises a peripheral gasket (15; 50) moulded from an elastomeric material and having at least one exterior, inwardly-projecting peripheral lip (61; 63) and an interior inwardly-projecting peripheral bead (16; 53) of predetermined thickness, thereby to form at least one interior peripheral groove in the gasket, the elastomeric gasket having a cross-sectional thickness such,that it is deformable and stretchable about the peripheral edges of the rigid elements (22, 23; 11) with the peripheral edges of at least one of the elements in the groove and the peripheral edges of the other of the elements abutting the interior bead whereby to form an interior chamber of predetermined thickness between the elements, the gasket including an opening communicating (12) between said chamber and the exterior of the gasket for receiving a bonding material for bonding the elements (22, 23) together.
Claim 3
Dependent Claim
33 words
Apparatus according to claim 1, characterised in that the elastomeric gasket (15; 50) cross-sectional thickness is sufficiently large as to provide the sole dimensional support for the two rigid elements (22, 23; 11).
Claim 4
Dependent Claim
80 words
Apparatus according to claim 1 or 2, characterised in that the two rigid elements are transparent glass sheets (22, 23), in that the peripheral gasket (15) includes a second exterior inwardly projecting lip (61), thereby forming a second interior peripheral groove between the peripheral bead (16) and the second lip, and in that the bonding material includes a dye of a colour such as to provide a predetermined pass band filter for the light emanating from the cathode ray tube.
Claim 5
Dependent Claim
28 words
Apparatus according to any of the preceding claims, characterised in that the thickness ot the interior bead (16) is a function of the concentration of the bonding material.
Claim 6
Dependent Claim
24 words
Apparatus according to claim 3, characterised in that one glass sheet (22, 23) includes a transparent conductive coating on a side opposite said chamber.
Claim 7
Dependent Claim
35 words
Apparatus according to claim 1 or 2, characterised in that one of the two rigid elements comprises a contrast enhancement filter (11) and the other thereof comprises the actual faceplate of the cathode ray tube.
Claim 8
Dependent Claim
48 words
Apparatus according to claim 6, characterised in that it further comprises a rigid multiple part frame member (36, 37, 38) surrounding the exterior of the gasket (50) and means for adjusting the frame parts to compress the elastomeric gasket (50) against the rigid filter (11) and rigid faceplate.
Claim 9
Dependent Claim
48 words
Apparatus according to claim 7, characterised in that the gasket (50) includes exterior outwardly projecting tabs (49) and the frame member (36, 37, 38) includes openings (48) for receiving the tabs, whereby to prevent relative lateral movement between the gasket (50) and frame upon compression of the gasket.
Claim 10
Independent Claim
212 words
A method of bonding at least two rigid elements of a cathode ray tube faceplate and cooperating contrast enhancement filter assembly, the elements having peripheral edges requiring precise coalignment and predetermined relative spacing therebetween, the method comprising the steps of a) forming a peripheral gasket (15; 50) from an elastomeric material having at least one exterior inwardly projecting peripheral lip (61; 63) and an interior inwardly projecting peripheral bead (16; 53) of predetermined thickness, thereby to form at least one interior peripheral groove and a chamber defined by the thickness of the bead, the gasket having a cross-sectional thickness sufficiently large as to provide the sole dimensional support for the two elements (22, 23; 11) and sufficiently small to permit deformation and stretching about the peripheral edges of the elements, the gasket including an opening (12; 54) communicating with the chamber, (b) deforming and stretching the peripheral gasket (15; 50) about the elements (22, 23; 11) with at least one thereof in the groove and the other thereof abutting the bead (16; 53) and closing the chamber, (c) filling the chamber through the opening (12; 54) with a curable bonding material, (d) curing said material, and (e) deforming and stretching the gasket (15; 50) to remove same from the now bonded elements.
Claim 11
Independent Claim
212 words
A method of bonding at least two rigid elements of a cathode ray tube faceplate and cooperating contrast enhancement filter assembly, the elements having peripheral edges requiring precise coalignment and predetermined relative spacing therebetween, the method comprising the steps of a) forming a peripheral gasket (15; 50) from an elastomeric material having at least one exterior inwardly projecting peripheral lip (61; 63) and an interior inwardly projecting peripheral bead (16; 53) of predetermined thickness, thereby to form at least one interior peripheral groove and a chamber defined by the thickness of the bead, the gasket having a cross-sectional thickness sufficiently large as to provide the sole dimensional support for the two elements (22, 23; 11) and sufficiently small to permit deformation and stretching about the peripheral edges of the elements, the gasket including an opening (12; 54) communicating with the chamber, (b) deforming and stretching the peripheral gasket (15; 50) about the elements (22, 23; 11) with at least one thereof in the groove and the other thereof abutting the bead (16; 53) and closing the chamber, (c) filling the chamber through the opening (12; 54) with a curable bonding material, (d) curing said material, and (e) deforming and stretching the gasket (15; 50) to remove same from the now bonded elements.
Claim 12
Dependent Claim
38 words
A method according to claim 9, characterised in that it further comprises the step of compressing the elastomeric gasket (50) about the elements (11) prior to filling the chamber using a rigid peripheral compression frame (36, 37, 38).
Claim 13
Independent Claim
194 words
A method of manufacturing an elastomeric gasket for supporting a rigid light filter relative to a cathode ray tube faceplate in a predetermined fixed relation to the faceplate during the bonding of the filter to the faceplate, characterised in that the method comprises the steps of a) forming a rigid mould mandrel having internal surfaces conforming in shape to the assembled filter (11) and faceplate in said predetermined fixed relation. b) securing the mandrel to a baseplate (33), c) inserting shims (39, 40, 41) between parts of a multipart peripheral frame (36, 37, 38), whereby to increase its peripheral dimensions. d) securing the peripheral frame to the baseplate in spaced relation to the mandrel, whereby to form a peripheral channel therebetween. e) filling the channel with a liquid material curable to an elastomeric material, and f) curing said material to form the elastomeric gasket (50), the outer peripheral dimensions thereof being larger than the multipart rigid frame (36, 37, 38) in the absence of the shims (39, 40, 41), whereby the frame (36, 37, 38) may be used without the shims to compress the elastomeric gasket (50) about the filter (11) and the faceplate.
Claim 14
Independent Claim
194 words
A method of manufacturing an elastomeric gasket for supporting a rigid light filter relative to a cathode ray tube faceplate in a predetermined fixed relation to the faceplate during the bonding of the filter to the faceplate, characterised in that the method comprises the steps of a) forming a rigid mould mandrel having internal surfaces conforming in shape to the assembled filter (11) and faceplate in said predetermined fixed relation. b) securing the mandrel to a baseplate (33), c) inserting shims (39, 40, 41) between parts of a multipart peripheral frame (36, 37, 38), whereby to increase its peripheral dimensions. d) securing the peripheral frame to the baseplate in spaced relation to the mandrel, whereby to form a peripheral channel therebetween. e) filling the channel with a liquid material curable to an elastomeric material, and f) curing said material to form the elastomeric gasket (50), the outer peripheral dimensions thereof being larger than the multipart rigid frame (36, 37, 38) in the absence of the shims (39, 40, 41), whereby the frame (36, 37, 38) may be used without the shims to compress the elastomeric gasket (50) about the filter (11) and the faceplate.
References Cited (Backward Citations)
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