| 摘要 |
<p>PURPOSE:To eliminate a coaxial matching and to remove the influence of temperature and humidity by causing the outer circumferencial surface of upper and lower fixed cylinder to be smaller than a half cylinder, providing a linking part to link the upper and lower fixed cylinders and molding this linking part and the upper and lower fixed cylinders into one body. CONSTITUTION:An outer circumferential member 2 unitedly molds a lower fixed cylinder 2a, which has an outer circumference part to be smaller than the half cylinder, an upper fixed cylinder 2b, a linking part 2c, which links the upper and lower fixed cylinders 2a and 2b with keeping an interval 2b at a degree a magnetic head 7 can be passed through, and a lead 2d to control the lower side position of a magnetic tape 20. The magnetic head 7 records and reproduces a signal with being protruded and revolved from the outer circumferencial surface of the outer circumference member 2 in an upper and lower cylinder interval 2e. Thus, since there is no outer circumference part to be larger than the half cylinder of the upper and lower cylinder, the title device is promoted to be light. Then, since the upper and lower cylinders are united, the coaxial matching goes to be eliminated and the influence of the temperature and humidity is removed. Then, performance is caused to be stable and reliability can be improved.</p> |
