A rotary head type magnetic recording/reproducing device includes a stationary drum, and a rotary drum disposed coaxially with the stationary drum and secured to the rotary shaft of the motor. The rotary drum has a cylindrical portion which is slightly greater in diameter than the stationary drum, a first truncated cone portion integrally connected to the cylindrical portion at a bottom thereof and decreasing in diameter in a direction toward the stationary drum at a first taper angle, and a second truncated cone portion integrally connected to a top surface of the first truncated cone portion at a bottom thereof and decreasing in diameter in the direction toward the stationary drum at a second taper angle which is greater than the first taper angle.
An instrument is disclosed for the analysis of the levitation of a structure such as a video tape rapidly running through fluid such as air, by simultaneously solving an equation on the pressure of fluid and an equation on the displacement of the structure. The instrument may include a data input part for reading data regarding the fluid and structure, a levitation analysis part for forming and solving simultaneous equation on the fluid and structure based on the input data, and a result output part for outputting the analyzed result.
A rotary head drum unit for a recording/reproducing apparatus comprises a stationary upper drum provided at its lower end with a taper surface for biasing a magnetic tape downward, a stationary lower drum provided in its circumference with a helical tape lead or guide surface to guide the lower edge of a tape helically extended across the upper and lower drums, and rotary heads inserted between the upper and lower drums. At least a portion of the taper surface of the upper drum in a lead-out region near a position where the magnetic tape departs from the rotary head drum unit is a helical taper section extended helical substantially in parallel to the helical tape lead or guide surface of the lower drum. The taper surface having the helical taper section is able to bias the magnetic taper downward in the lead-out region so that the lower edge of the magnetic tape is guided securely by the helical tape guide surface of the lower drum and keeps the upper edge of the magnetic tape taut through the entire arc of contact of the magnetic tape with the rotary head drum unit, so that the magnetic tape is secured for stable running.
A levitation phenomenon analyzer includes: a data input portion for reading data on fluid and structural components and minute structures of a device; a levitation analysis portion for solving basic simultaneous equations of the fluid and the structural components on the basis of the data; and a result output portion for outputting analytical results of the levitation analysis portion; wherein by regarding a flow path of the fluid for levitation analysis as a mean thickness of a air film or regarding the pressure of the fluid as a mean pressure, shapes of the minute structures which are independent of coordinates of nodal points are handled.
A rotary head helical scan tape record and/or reproduce apparatus has an upper rotatable cylindrical drum tape guide section and a stationary lower cylindrical drum tape guide section that includes a narrow upper ridge which is displaced radially from the axis of the stationary cylindrical drum tape guide section in a direction towards the location where the rotary head ends the scan of the tape. Magnetic tape is transported in a helical path from the lower stationary drum guide section, over the radially displaced upper ridge to the upper rotatable drum guide section, which carries the record and/or reproduce heads that transfer signals to and from the tape.
