JPS6215910Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a cartridge type cassette tape.

In a conventional cassette tape, as shown in FIG. 2, thin sheets 2, 2, such as tetrafluoroethylene film, are placed so that the cassette half 1 does not come into direct contact with the reel hub 4 or the tape roll. However, if a rectangular sheet 2, which is approximately the same size as a conventional cassette half, is used, as the usage time of the cassette tape increases, the tape will stretch, resulting in a wakame-like shape on both sides of the tape, and the rotation of the tape will be affected. As a result, the frictional force against the sheet increases, and the winding torque increases, causing the tape to stop rotating or causing uneven rotation, which has a negative impact on playback. Furthermore, not only the tape but also the surface of the sheet became rough due to long use, increasing the frictional force.

Therefore, in the present invention, in order to solve these conventional drawbacks, the sliding sheet 3 is formed into a donut-shaped disk, as shown in FIGS. 3 and 4, and Teflon particles are bonded to the surface of the sheet by thermocompression. The dimensions of the disc are approximately 41.5 mm between the reel hubs, so the outer diameter is approximately 38 mm.
Approximately mm is appropriate. The thickness of the Teflon particles may be approximately 1 μm.

The sliding sheet 3 constructed as described above is placed on both sides of the left and right reel hubs 4 in the cassette half 1, as shown in FIG. If you start tape winding now, the tape winding body on the supply side will be
It is formed larger than the sliding sheet 3 in view of the recording/reproducing time, and is also placed on the sliding sheet 3 on the take-up side, but both sliding sheets 3 rotate within the cassette half as the tape runs. As the diameter of the supply side winding body decreases, the winding side winding body diameter increases, and the winding side sheet 3 rotates together with the winding body. Therefore, when a cassette tape with such a structure is used, the side edges of the tape may stretch into wakame-like shapes due to long-term use, increasing the frictional force between the tape and the sheet 3, or the sheet surface may become rough, causing slippage. Even if things get bad, the sliding sheet 3 itself rotates together with the reel hub 4, so the tape winding torque increases and the tape never stops or breaks. Also, since the tape always rotates smoothly, it does not affect tape speed or wow/flutter.

As described above, according to the present invention, the circular sliding sheet rotates while sliding on the inner surface of the cassette, and the tape winding body rotates without slipping between both sides of the cassette and the circular sliding sheet. Damage to the side edges can be effectively prevented, and the tape roll rotates smoothly, ensuring good tape running characteristics over a long period of time. Also, since the circular sliding sheet itself has lubricity, It is possible to prevent damage to the side edges of the tape due to contact with the circular sliding sheet and the side edges of the tape wound on the tape roll and the tape pulled out from the tape roll, and also because one of the tape rolls has a large diameter. Even if the outer circumference of the tape roll is rubbed by the other circular sliding sheet, the side edges of the tape can be prevented from being damaged, and since the circular sliding sheet itself has lubricating properties, a separate lubricating member is required. It has the advantage that it can be constructed with a reduced number of parts and without dimensional restrictions.

[Brief explanation of the drawing]

Fig. 1 is an external appearance of a cassette tape, Fig. 2 is a developed view showing a conventional sliding sheet, Fig. 3 is a developed view showing the sliding sheet of the present invention, and Fig. 4 is a developed view showing an example of using the present invention in a cassette tape. It is. 1...Cassette half, 2, 3...Slip sheet, 4...Reel hub.

Claims (1)

[Scope of utility model registration request] A cassette type tape cartridge comprising a circular sliding sheet that is easy to slip, and rotatably disposed between both sides of a reel hub and a tape winding body and the inner surface of a cassette.