Registers – Coded record sensors – Particular sensor structure
Patent
1987-11-13
1989-11-14
Trafton, David L.
Registers
Coded record sensors
Particular sensor structure
235436, 235384, 235482, 360 2, G06K 708
Patent
active
048809632
ABSTRACT:
A system and apparatus for encoding magnetic information on a magnetizable substrate where the substrate is liable to be moved erratically, e.g. manually, past a magnetic head. Two parallel tracks are provided on the substrate and the first is encoded with binary information conventionally with shorter spaces between change of field representing one binary digit and longer spaces representing the other digit. The other track is encoded using changes in field on the first track as a timing reference such that any change of field on the second track substantially coincides with a change of field on the first track and one digit of the binary pair is represented by no change in field as the field changes on the first track while the other binary digit is represented by a change of field coincidentally with a change of field on the first track. The system and apparatus are eminently suited for use in parking meters where a power source to drive a card consistently past a reading head is not available.
REFERENCES:
patent: 4173026 (1979-10-01), Deming
patent: 4180837 (1979-12-01), Michaud
patent: 4225780 (1980-09-01), Jacoub et al.
LandOfFree
Encoding magnetic cards does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Encoding magnetic cards, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Encoding magnetic cards will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1854075