US4865241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for subdividing into pieces a ceramic plate
Assignee: US Philips Corp
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Filing: 1984-12-07
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Granted: 1989-09-12
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Expires: 2004-12-07
Abstract
Abstract The invention provides a method and apparatus for breaking ceramic substrates which are used in the manufacture of hybrid electronic circuits. The substrate to be divided is subjected to a predetermined rigid deformation by means of two rigid dies having a circular cross-section with radii which differ. The centers of curvature of the circular cross-sections coincide when the dies are in their final position.
Inventors
- 👤 Christian Hamel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:27
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/0011; H05K3/0044; H05K3/0052; B; B28; B28D; B28D5/00; B28D5/0005; B28D5/0011; B28D5/0041; B28D5/0058; H10; H10P; H10P52/00; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K2201/00; H05K2201/09; H05K2201/09009; H05K2201/0909; H05K2203/00; H05K2203/30; H05K2203/302; Y; Y10; Y10T; Y10T225/00; Y10T225/10; Y10T225/12; Y10T225/16; Y10T225/30; Y10T225/307; Y10T225/321; Y10T225/325; Y10T225/329
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
159 words
A method of subdividing a ceramic plate into pieces comprising the steps of forming at least one first line of fracture on said ceramic plate, placing said ceramic plate between at least one assembly of a first die of rigid material and of a second die of rigid material, said first die having a cylindrical convex surface facing one surface of said ceramic plate, and said second die having a cylindrical concave surface facing a second opposite surface of said ceramic plate, wherein said convex surface has generatrices substantially parallel to generatrices of said concave surface, said generatrices being parallel to said first lines of fracture, and wherein said convex surface and said concave surface have different radii of curvature, and moving said first and second dies toward each other to a stop position to form a predetermined distance between said dies, said stop position being set so that said ceramic plate fractures along said first lines of fracture.
Claim 2
Independent Claim
159 words
A method of subdividing a ceramic plate into pieces comprising the steps of forming at least one first line of fracture on said ceramic plate, placing said ceramic plate between at least one assembly of a first die of rigid material and of a second die of rigid material, said first die having a cylindrical convex surface facing one surface of said ceramic plate, and said second die having a cylindrical concave surface facing a second opposite surface of said ceramic plate, wherein said convex surface has generatrices substantially parallel to generatrices of said concave surface, said generatrices being parallel to said first lines of fracture, and wherein said convex surface and said concave surface have different radii of curvature, and moving said first and second dies toward each other to a stop position to form a predetermined distance between said dies, said stop position being set so that said ceramic plate fractures along said first lines of fracture.
Claim 3
Dependent Claim
131 words
A method according to claim 1, further comprising the steps of forming at least one second line of fracture in said ceramic plate at the time of forming said first lines of fracture, said first and second lines of fracture being at an angle with each other, placing another assembly of two dies adjacent said at least one assembly, said two dies of said another assembly having generatrices substantially parallel to said second lines of fracture forming said ceramic plate on an adhesive transport tape, and moving said adhesive transport tape from said at least one assembly to said another assembly, wherein said ceramic plate is subdivided along said first lines of fracture in said at least one assembly and subdivided along said second lines of fracture in said another assembly.
Claim 4
Independent Claim
170 words
An apparatus for subdividing a ceramic plate into pieces comprising a first die having a circular cross-sectional cylindrical shape, said shape being a convex surface with a first radius of curvature, a second die having a circular cross-sectional cylindrical shape, said shape being a concave surface with a second different radius of curvature Re, said concave surface havingg generatrices substantially parallel to generatrices of said convex surface, means for moving said first and second dies toward each other, and stop means for limiting displacement of said first and second dies toward each other at a predetermined separation, said separation being substantially equal to e+Re[1-cos (arc sin (1/2Re))] where e is a thickness of the ceramic plate and 1 is a dimension at right angles to lines of fracture, wherein said ceramic plate having at least one line of fracture is placed between said first and second dies, and said ceramic plate fractures along said lines of fracture at said separation, and wherein centers of said circular cross-sectional shapes substantially coincide.
Claim 5
Independent Claim
170 words
An apparatus for subdividing a ceramic plate into pieces comprising a first die having a circular cross-sectional cylindrical shape, said shape being a convex surface with a first radius of curvature, a second die having a circular cross-sectional cylindrical shape, said shape being a concave surface with a second different radius of curvature Re, said concave surface havingg generatrices substantially parallel to generatrices of said convex surface, means for moving said first and second dies toward each other, and stop means for limiting displacement of said first and second dies toward each other at a predetermined separation, said separation being substantially equal to e+Re[1-cos (arc sin (1/2Re))] where e is a thickness of the ceramic plate and 1 is a dimension at right angles to lines of fracture, wherein said ceramic plate having at least one line of fracture is placed between said first and second dies, and said ceramic plate fractures along said lines of fracture at said separation, and wherein centers of said circular cross-sectional shapes substantially coincide.
Claim 6
Dependent Claim
52 words
An apparatus according to claim 3, wherein a second assembly of two dies is provided, said two dies having generatrices at an angle to said generatrices of said first and second dies, and wherein said ceramic plate is mounted on an adhesive transport tape to move said ceramic plate between said dies.
Claim 7
Dependent Claim
43 words
An apparatus according to claim 4, wherein said adhesive transport tape is divided into several parallel bands, each of said parallel bands corresponding to pieces of said ceramic plate after subdivision in a direction parallel to the direction of said adhesive transport tape.
Claim 8
Independent Claim
130 words
An apparatus for subdividing a ceramic plate into pieces comprising at least one assembly of a first die of rigid material having a cylindrical convex surface and of a second die of rigid material having a cylindrical concave surface, said convex surface having generatrices substantially parallel to generatrices of said concave surface, said convex and concave surfaces having different radii of curvature, means for moving said first and second dies toward each other, and stop means for limiting displacement of said first and second dies toward each other at a predetermined separation, wherein a ceramic plate having at least one line of fracture is placed between said first and second dies, and said ceramic plate fractures along said lines of fracture at a stop position determined by said stop means.
Claim 9
Independent Claim
130 words
An apparatus for subdividing a ceramic plate into pieces comprising at least one assembly of a first die of rigid material having a cylindrical convex surface and of a second die of rigid material having a cylindrical concave surface, said convex surface having generatrices substantially parallel to generatrices of said concave surface, said convex and concave surfaces having different radii of curvature, means for moving said first and second dies toward each other, and stop means for limiting displacement of said first and second dies toward each other at a predetermined separation, wherein a ceramic plate having at least one line of fracture is placed between said first and second dies, and said ceramic plate fractures along said lines of fracture at a stop position determined by said stop means.
Claim 10
Dependent Claim
50 words
An apparatus according to claim 6, wherein another assembly is provided of two dies having generatrices at an angle to said generatrices of said first and second dies, and wherein said ceramic plate is mounted on an adhesive transport tape to move said ceramic plate between said assemblies of dies.
Claim 11
Dependent Claim
43 words
An apparatus according to claim 7, wherein said adhesive transport tape is divided into several parallel bands, each of said parallel bands corresponding to pieces of said ceramic plate after subdivision in a direction parallel to the direction of said adhesive transport tape.
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) | 1992-09-11 | 1993-03-13 | 1993-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-11 | 1997-03-13 | 1997-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-11 | 2001-03-13 | 2001-09-12 | $7700.00 | Window Closed / Lapsed |