Head drum device with carbon-containing synthetic resin upper drum and larger diameter intermediate drum

   
   

A head drum device of the present invention prevents a magnetic tape (2) from clinging to the head drum device (3) due to electrostatic charge by using a carbon-containing synthetic resin as the material of an upper drum (33) in order to reduce the manufacturing cost for the upper drum. Also, setting the outside diameter of the upper drum (33) smaller than that of an intermediate drum (32) eliminates the need for a high-level of manufacturing precision in the manufacture of the upper drum (33). Thus, it is possible to reduce the manufacturing cost for the upper drum (33).

Um dispositivo principal do cilindro da invenção atual impede que uma fita adesiva magnética (2) se adira ao dispositivo principal do cilindro (3) devido à carga eletrostática usando uma resina sintética carbono-contendo como o material de um cilindro superior (33) a fim reduzir o manufacturing custou para o cilindro superior. Também, ajustar o diâmetro exterior do cilindro superior (33) menor do que aquele de um cilindro intermediário (32) elimina a necessidade para um high-level da precisão do manufacturing na manufatura do cilindro superior (33). Assim, é possível reduzir o manufacturing custado para o cilindro superior (33).

 
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