Precision bonding system

• US 3,919,452 A
• Filed: 10/23/1973
• Issued: 11/11/1975
• Est. Priority Date: 10/23/1973
• Status: Expired due to Term

• Current Assignee: Aloyzas Petrikas, George Richard Castles, Kitty S. Ettre
• Original Assignee: Aloyzas Petrikas, George Richard Castles, Kitty S. Ettre
• Inventors: Ettre, Kitty S., Castles, George Richard, Petrikas, Aloyzas
• Primary Examiner(s): Lesmes, George F.
• Assistant Examiner(s): McDonald, Alan T.
• Application Number:
  US05/408,501
• Time in Patent Office: 749 Days
• Field of Search: 161/162,164,166,168,DIG.5,192,193,406 156/106,109 350/16LC
• US Class Current: 428/325
• CPC Class Codes: C04B 2237/06 Oxidic interlayers
• CPC Class Codes: C04B 2237/10 Glass interlayers, e.g. frit or flux
• CPC Class Codes: C04B 2237/32 Ceramic
• CPC Class Codes: C04B 2237/592 whereby the interlayer is not continuous, e.g. not the whole surface of the smallest substrate is covered by the interlayer
• CPC Class Codes: C04B 2237/595 whereby the interlayer is continuous, but heterogeneous on macro-scale, e.g. one part of the interlayer being a joining material, another part being an electrode material
• CPC Class Codes: C04B 2237/708 of one or more of the interlayers
• CPC Class Codes: C04B 35/645 Pressure sintering
• CPC Class Codes: C04B 37/045 characterised by the interlayer used C04B37/047 takes precedence
• CPC Class Codes: C09K 2323/05 Bonding or intermediate layer characterised by chemical composition, e.g. sealant or spacer
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells
• CPC Class Codes: H01J 9/261 the vessel being for a flat panel display for flat discharge lamps H01J9/268
• CPC Class Codes: Y10T 428/231 Filled with gas other than air; or under vacuum
• CPC Class Codes: Y10T 428/24744 Longitudinal or transverse tubular cavity or cell
• CPC Class Codes: Y10T 428/24793 Comprising discontinuous or differential impregnation or bond
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/24926 including ceramic, glass, porcelain or quartz layer
• CPC Class Codes: Y10T 428/249974 Metal- or silicon-containing element
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/252 Glass or ceramic [i.e., fired or glazed clay, cement, etc.] [porcelain, quartz, etc.]

Abstract

By providing a sealing system for bonding which incorporates a sealing cement and at least three spacers disposed within said sealing cement, two members can be easily and securely bonded together with a precise separation gap between them and with the lateral flow of the sealing cement precisely controlled. Preferably, spherical spacers are employed having a diameter equal to the spacing desired between the members being joined, and the sealing cement incorporates a thermal expansion compatible with the thermal expansion of the members being joined.

Claims

1. A SEALING SYSTEM FOR INTIMATELY BONDING TWO MEMBERS WITH A PRECISELY SPACED SEPARATION GAP COMPRISING:

A. SEALING CEMENT DISPOSED BETWEEN SAID TWO MEMBERS ABOUT THE SEALING AREAS THEREOF, AND B. AT LEAST THREE SPACERS DISPOSED WITHIN SAID SEALING CEMENT, FOR MAINTAINING A PRECISE SEPARATION GAP BETWEEN SAID MEMBERS WHEN SAID CEMENT IS CURED.

2. The sealing system defined in claim 1, wherein said spacers comprise a material having a higher melting point than the sealing cement.

3. The sealing system defined in claim 2, wherein said spacers comprise high temperature glass balls.

4. The sealing system defined in Claim 1, wherein said pre-formed transfer tape layer of sealing cement further incorporates removable surface protection sheets on at least one surface thereof.

5. The sealing system defined in claim 4, wherein said sheet comprises a shape-retaining back-up sheet.

6. The sealing system defined in claim 1, wherein said spacers are symmetrically substantially equidistantly disposed within said sealing cement.

7. The sealing system defined in claim 1, wherein at least a portion of each of said spacers is positioned within said sealing cement, assuring firm, secure retention thereby.

8. The sealing system defined in claim 1, wherein said spacers are positioned within said sealing cement with the outermost surface of said spacer substantially coextensive with one surface of said a pre-formed transfer tape layer of sealing cement.

9. A SEALING SYSTEM FOR INTIMATELY BONDING TOW MEMBERS OF A GAS DISCHARGE DEVICE WITH A PRECISELY SPACED PEPARATION GAP IN WHICH AN INTERIOR AREA OF THE GAP DISCHARGE DEVICE MUST NOT HAVE ANY SEALING CEMENT THEREIN, COMPOSITING:

A. A PRE-FORMED, TRANSFER TYPE LAYER OF SEALING CEMENT OF UNIFORM THICKNESS FORMED IN THE SHAPE OF A CLOSED FRAME DEFINING AN OPEN AREA IN THE CENTER THEREOF, SAID CLOSED FRAME SUBSTANTIALLY CONFORMING TO THE SEALING AREAS OF SAID GAS DISCHARGE DEVICE, AND B. AT LEAST THREE UNIFORMLY SIZED AND SHAPED SPACERS DISPOSED WITHIN SAID TRANSFER TAPE LAYER ALL OF SAID SPACERS COMPRISING SUBSTANTIALLY IDENTICAL DIMENSIONS IN THE DIRECTION CORRESPONDING TO THE THICKNESS OF THE TRANSFER

10. A SEALING SYSTEM FOR INTIMATELY BONDING LIQUID CRYSTALS DEVICES WITH A PRECISE SEPARATION GAP THEREBETWEEN COMPRISING:

A. A PRE-FORMED TRANSFER TAPE LAYER OF SEALING CEMENT OF UNIFORM THICKNESS FORMED IN THE SHAPE OF A CLOSED FRAME DEFINING AN OPN AREA IN THE CENTER THEREOF, SAID CLOSED FRAME SUBSTANTIALLY CONFORMING TO THE SEALING AREAS OF SAID LIQUID CRYSTALS, AND B. AT LEAST THREE UNIFORMLY SIZED AND SHAPED SPECERS DISPOSED WITHIN SAID TRANSFER TAPE LAYER ALL OF SAID SPACERS COMPRISING SUBSTANTIALLY IDENTICAL DIMENSIONS IN THE DIREACTION CORRESPONDING TO THE THICKNESS OF THE TRANSFER TAPE LAYER SAID DIMENSION BEING SMALLER THAN THE THICKNESS OF THE TRANSFER TAPE LAYER.

11. The sealing system defined in claim 1, wherein said closed frame comprises four frame members each of which are perpendicular to adjacent frame members, forming a rectangularly shaped closed frame, and two of said spacers are positioned in oppositely facing frame members.

12. The sealing system defined in claim 11, wherein four spacers are disposed in said transfer tape layer in groups of two near the ends of said oppositely facing frame members.

13. A sealing system defined in claim 1, wherein said spacers comprise a geometric shape establishing a concave cavity in said sealing cement facing in the direction of said spacer.