US4991055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing multilayer ceramic capcitors
Assignee: US Philips Corp
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Filing: 1989-04-06
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Granted: 1991-02-05
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Expires: 2009-04-06
Abstract
Abstract A method and a device for manufacturing multilayer ceramic capacitors, in which a plate of ceramic material composed of several layers is subdivided in the green non-sintered state into separate capacitor elements. For this purpose, by means of notching members, notches of a given depth are provided simultaneously on both sides of the plate in such a manner that spontaneous ruptures are obtained through the remaining thickness of the plate. Due to this method, the contamination of the exposed electrode layers and delamination are avoided. By the use of a frame with resilient walls, the already separated capacitor elements are held together until the notching process has been carried out completely.
Inventors
- 👤 Antonius G. Marneffe
- 👤 Frederik G. A. Persoon
- 👤 Gerard J. Scholten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:08
CPC Classifications
H; H01; H01G; H01G13/00; H01G4/00; H01G4/30; Y; Y10; Y10T; Y10T225/00; Y10T225/10; Y10T225/12; Y10T225/30; Y10T225/307; Y10T225/321; Y10T225/329; Y10T29/00; Y10T29/43; Y10T29/435; Y10T29/49; Y10T29/49787; Y10T29/49789; Y10T29/4979
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
206 words
A device for carrying out a method of manufacturing multilayer ceramic capacitors, in which electrode layers of electrode material are locally applied to sheets of dielectric ceramic material, the sheets provided with electrode layers are stacked and compressed to form a laminated plate and this plate is then subdivided into separate capacitor elements in such a manner that successive electrode layers are exposed to opposite end faces of the capacitor elements, after which the capacitor elements are sintered and are provided with an electrically conducting layer on the said end faces, characterized in that the plate is subdivided into separate capacitor elements by notching the plate along division lines on both sides simultaneously in such a manner that along the notched division lines a spontaneous rupture occurs through the remaining thickness of the plate, characterized by an upper die and a lower die which can be displaced relative to each other and each comprise two notching blocks and a notching member, which device is further characterized by a carriage which can be displaced between the two dies and serves as a carrier for a frame which has a central quadrangular opening of which two adjacent walls at right angles to each other are of resilient construction.
Claim 2
Independent Claim
206 words
A device for carrying out a method of manufacturing multilayer ceramic capacitors, in which electrode layers of electrode material are locally applied to sheets of dielectric ceramic material, the sheets provided with electrode layers are stacked and compressed to form a laminated plate and this plate is then subdivided into separate capacitor elements in such a manner that successive electrode layers are exposed to opposite end faces of the capacitor elements, after which the capacitor elements are sintered and are provided with an electrically conducting layer on the said end faces, characterized in that the plate is subdivided into separate capacitor elements by notching the plate along division lines on both sides simultaneously in such a manner that along the notched division lines a spontaneous rupture occurs through the remaining thickness of the plate, characterized by an upper die and a lower die which can be displaced relative to each other and each comprise two notching blocks and a notching member, which device is further characterized by a carriage which can be displaced between the two dies and serves as a carrier for a frame which has a central quadrangular opening of which two adjacent walls at right angles to each other are of resilient construction.
Claim 3
Dependent Claim
50 words
A device as claimed in claim 1, characterized in that the resilient walls of the frame are each constituted by an elongate wall portion which faces the central opening and is connected by means of a central bridge portion to a rib limited by recesses and acting as a spring.
Claim 4
Dependent Claim
30 words
A device as claimed in claim 2, characterized in that the notching members have a blunt dull notching edge having, viewed in cross-section, a width of at least 30 μm.
Claim 5
Dependent Claim
30 words
A device as claimed in claim 1, characterized in that the notching members have a blunt dull notching edge having, viewed in cross-section, a width of at least 30 μm.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |