Browse Prior Art Database

Oscillating Transducer

IP.com Disclosure Number: IPCOM000075251D
Original Publication Date: 1971-Aug-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Joyce, LA: AUTHOR

Abstract

A transducer 1 for reading from and writing on a label 2 is shown in Fig. 1. Transducer 1 consists of arm 3, supported within casing 4 for oscillatory motion about pivot 5. The free end of the arm carries a weighted protective housing 6, which contains two magnetic read/write heads 7 enclosed side-by-side within housing 6. Springs 8 connect arm 3 to each side of casing 4 and are chosen so that the arm assembly forms a mechanical resonating system. Two guide rails 9 (only one shown) located in grooves on each side of housing 6 permits oscillatory movement only in the required direction. Dust is excluded from casing 4 by flexible seals 10 extending between casing 4 and housing 6.

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Oscillating Transducer

A transducer 1 for reading from and writing on a label 2 is shown in Fig. 1. Transducer 1 consists of arm 3, supported within casing 4 for oscillatory motion about pivot 5. The free end of the arm carries a weighted protective housing 6, which contains two magnetic read/write heads 7 enclosed side-by-side within housing 6. Springs 8 connect arm 3 to each side of casing 4 and are chosen so that the arm assembly forms a mechanical resonating system. Two guide rails 9 (only one shown) located in grooves on each side of housing 6 permits oscillatory movement only in the required direction. Dust is excluded from casing 4 by flexible seals 10 extending between casing 4 and housing 6.

Label 2 shown in Fig. 2, is rectangular in shape and has a narrow border 11 of adhesive around its lower periphery for attachment to any desired article. A magnetic strip 12, having the same shape as the cross-section of the transducer, is provided on the opposite face of label 2.

In operation, transducer 1 is placed in contact with the label overlying magnetic strip 12. The heads 7 are then deflected by means, not shown, and oscillate to and fro across strip 12. Data and clock pulses are simultaneously written in adjacent tracks 13 and 14 along the strip 12. Writing is limited to the central region of the strip where the head velocity is high enough for good data recovery. Since a clock track always accompanies a data track, constant speed of the heads is not critic...