Browse Prior Art Database

Fully Automatic Via Punching Head

IP.com Disclosure Number: IPCOM000085446D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Kranik, JR: AUTHOR [+2]

Abstract

An article entitled, "`Air Spring' Programmable Via Punching Head", published in the IBM Technical Disclosure Bulletin, Vol. 16, No. 12, May 1974, pages 3933 and 3934, describes an air spring punching head for perforating small via holes in unfired ceramic sheet with "micro" tungsten carbide punches. The structure described in the above-mentioned article must use a metal programming mask containing clearance openings in the desired via hole configuration, so as to select the pattern of the desired via hole.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 76% of the total text.

Page 1 of 2

Fully Automatic Via Punching Head

An article entitled, "`Air Spring' Programmable Via Punching Head", published in the IBM Technical Disclosure Bulletin, Vol. 16, No. 12, May 1974, pages 3933 and 3934, describes an air spring punching head for perforating small via holes in unfired ceramic sheet with "micro" tungsten carbide punches. The structure described in the above-mentioned article must use a metal programming mask containing clearance openings in the desired via hole configuration, so as to select the pattern of the desired via hole.

The present structure represents an improvement in the above basic structure, wherein the program mask is completely eliminated. With reference to the figure, the single thin-flexible diaphragm common to all punch locations and under a common manifold pressure in the above-mentioned article has been replaced by individual thin rubber preformed diaphragms 2, which can be independently pressurized (P1) when via perforation of the ceramic sheet is desired. This pressurizing results in deformation of the diaphragm 2 around steel ball 7, thereby restricting movement of the punch 4 upon its impact of the ceramic sheet.

When a particular punch site is to be inactive (no via produced), the pressure on that portion of the diaphragm 2 is vented via a three-way valve 3. This restores the diaphragm 2 to its relaxed state which provides a clearance between its inner wall and the steel ball 7. Upon contacting the ceramic sheet, the low- mas...