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Browse Prior Art Database

Magnetic Badge Reading Device

IP.com Disclosure Number: IPCOM000095281D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Croisier, A: AUTHOR

Abstract

The badge reader generates two definite frequencies for given data. A magnetic representation of each data is in such a way that sensing produces directly the corresponding frequencies. The magnetic slugs are not magnetically polarized but act through their predetermined, permanent forms.

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Magnetic Badge Reading Device

The badge reader generates two definite frequencies for given data. A magnetic representation of each data is in such a way that sensing produces directly the corresponding frequencies. The magnetic slugs are not magnetically polarized but act through their predetermined, permanent forms.

The drawing shows a badge and its reader. Coils L1 and L2 are frequency controlling elements in the circuit of two-frequency oscillator Osc. The magnetic circuits of L1 and L2 are closed, respectively, through yokes Y1 and Y2 and slugs S1 and S2. The latter are inserted in prepared positions of the badge. The oscillating frequencies depend upon the length, width and thickness of the slugs. Thus, by using either slugs of various dimensions or no slug, any combination of frequencies can be produced. A position control system moves the badge step- by-step and shuts Osc off during the translation.

Knockoff holes not shown can be used to stop the badge at any preset point The slugs are made of soft ferrite and are either ground to the tolerance or sorted according to the frequency produced in a standard system. By making L1 and L2 only a part of the tuned circuit's inductances, tolerances are matched. The card is assembled by introducing precalibrated slugs into the holes. The assembly is sealed either by pouring or welding an additional layer of thermoplastic material.

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