Browse Prior Art Database

Method for Forming Card Identification Codes

IP.com Disclosure Number: IPCOM000119956D
Original Publication Date: 1991-Mar-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Mutoh, D: AUTHOR [+3]

Abstract

Disclosed is a method for forming circuit card identification (ID) codes, in which ID codes can be programed with ease by through holes and plating.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Method for Forming Card Identification Codes

      Disclosed is a method for forming circuit card
identification (ID) codes, in which ID codes can be programed with
ease by through holes and plating.

      It is assumed that ID codes are programmed in cards which
include two wiring levels.  In Fig. 1, the ID codes are programmed by
selectively connecting terminals S1 - S3 to terminals D1 - D7.  The
terminals S1 - S3 and D1 - D7 are formed in the first wiring level.
To connect the terminals S1 - S3 to the terminals D1 - D7 in a
selected pattern, through holes are drilled at selected lands.  For
example, in Fig. 2, when terminals S1 and D3 are to be connected,
through holes are drilled at lands L1 and L2.  By plating the through
holes L1 and L2 and the path in the second wiring level which extends
between the through holes L1 and L2, a continuous electrical path is
established between the terminals S1 and D3.  The paths in the second
wiring level which are used to connect through holes are indicated by
broken lines in Fig. 2. The plating can be done simultaneously with
the plating for forming circuits in the first and second wiring
levels. Therefore, ID codes can be programmed in the intermediate
stage of card manufacturing process.