Noise muffler for magnetic tape vacuum column

Details Noise muffler for magnetic tape vacuum column Noise muffler for magnetic tape vacuum column

1973-06-05

1977-07-12

Christian, Leonard D.

Winding, tensioning, or guiding

Strand tensioning device

Tortuous course

181 33K, G11B 1558, G11B 2312

Patent

active

RE0293016

ABSTRACT:
Noise in the frequency range of 60 to 3,000 Hz generated by movement of magnetic tape in a vacuum column is muffled by use of Helmholtz cavities. The connecting ports to the cavities are placed near the top of the vacuum column close to the source of the noise and also where they provide an impedance mismatch barrier to sound waves trying to exit from the top of the vacuum column. The size of the ports and location of the ports in the vacuum columns are predetermined so that the ports will not inhibit the loading of the tape loop into the vacuum column.

REFERENCES:
patent: 1724163 (1929-08-01), Youngberg
patent: 3476210 (1969-11-01), Carlson
patent: 3513938 (1970-05-01), Buehner et al.

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