Template type cavity-formation device for low temperature cofired ceramic (LTCC) sheets
US5855803A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 1996 |
| Grant date | Jan 5, 1999 |
| Priority date | — |
| Expiry date | Nov 20, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1062
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A cavity pattern for a laminated structure such as a substrate for integrated circuitry is formed in a sheet of unfired low temperature cofired ceramic (LTCC) material also known as "green" tape. One sheet at a time is placed in a flexible ram forming die including a resilient rubber pressure pad and a template including the pattern to be formed in the sheet. A pair of outer pressure plates hold the pressure pad and template in place. When a sheet of unfired LTCC material is placed between the pressure pad and template and pressurization is applied to the outer plates, extrusion of the rubber material through the template causes the tape to be sheared off at the edges of the holes in the template, thus effectively cutting the required pattern in the sheet. Following pressurization, the sheet now with the pattern cut therein is removed from the die and the residual tape cut-outs are subsequently removed from the template by a vacuum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.