Magnetic tape cassette
US6622952B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 2002 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Jul 15, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/0025
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The cassette half molding method molds one of upper and lower halves of the magnetic tape cassette by injection molding with an injection mold in which a gas vent pin for smoothing a flow of molten resin to be introduced in the cavity for molding a transparent or semitransparent window portion provided in the upper half. The cassette half is molded by this molding method. The magnetic tape cassette has a friction sheet interposed either between a pair of take-up hubs and the upper half, or between the pair of take-up hubs and the lower half, or both, and the friction sheet is made of polyethylene-based resin and has a surface electric resistance value in the range of 1×107 &OHgr; to 1×1010 &OHgr;. The magnetic tape cassette has a rib for reducing a resistance when the roller of the detecting member passes through which is provided at a position corresponding to a recess and on a side of the front lid in the top surface of the body case.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.