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Magnetic Stripe Reader Head Control Method

IP.com Disclosure Number: IPCOM000113931D
Original Publication Date: 1994-Oct-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Endoh, M: AUTHOR [+3]

Abstract

Disclosed is the Magnetic Stripe Reader (MSR) head control method which enables a Magnetic Stripe Reader to read data in minimum time without the medium size information. This method also has the ability to control the MSR head spanning area without the information of the data length.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 89% of the total text.

Magnetic Stripe Reader Head Control Method

      Disclosed is the Magnetic Stripe Reader (MSR) head control
method which enables a Magnetic Stripe Reader to read data in minimum
time without the medium size information.  This method also has the
ability to control the MSR head spanning area without the information
of the data length.

      Fig. 1 shows the configuration of the MSR head control method.
The MSR head (2) detects the flux change on the magnetic stripe, and
the analog signal of this flux change is amplified through the
Amplifier Circuit (4).  Since the F/2F format has flux change (Fig.
2), the MSR head (2) is able to detect the flux change whenever it is
scanning the encoded data area.

      This configuration has the timer (7) which counts the time
between the flux change and the next flux change.  When the MSR head
(2) detects the Sync.  bit (6), the microcode starts comparing the
timer (7) value with the preset arbitrary time.  If the timer (7)
expires due to no flux change being detected within the preset
arbitrary time, it means the end of the data.  If this condition
happens, the MSR motor control circuit (8) immediately stops the MSR
head (2) and returns it to its home position.

The following is the merits of this MSR control method.
 o   The feed back structure for the move distance information of the
    head, which is returned from  the MSR motor, is not necessary.
 o   The information of the medium size is not necessary.
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