Claims
- 1. An audio tape cassette comprising a cassette shell, a pair of hubs positioned to rotate in said cassette shell, a magnetic tape having a back coating layer wound around said hubs and having a magnetic layer facing outward, said back coating layer having a pencil hardness of not harder than "5H" and a center line average height of not larger than 0.03 .mu.m, guiding parts positioned in said cassette shell to guide said magnetic tape in a running condition, and a felt pad of angora rabbit fur positioned between said pair of hubs at a front of said cassette shell which contacts said back coating layer of said magnetic tape to press said magnetic tape to a magnetic head, wherein said back coating layer comprises a pigment having a Moh's hardness not larger than 4 dispersed in a binder resin such that said back coating layer has a coefficient of friction against said felt pad of not larger than 0.4.
- 2. The audio tape cassette according to claim 1, wherein said pigment is CaCO.sub.3.
- 3. The audio tape cassette of claim 1, wherein said binder resin is selected from at least one member of the group consisting of a vinyl chloride-vinyl acetate copolymer and a polyurethane resin.
- 4. The audio tape cassette according to claim 1, wherein said cassette shell is made of a synthetic resin.
- 5. The audio tape cassette according to claim 4, wherein said synthetic resin is an ethylene-propylene copolymer.
- 6. The audio tape cassette according to claim 4, wherein said synthetic resin is a phenol resin.
- 7. The audio tape cassette according to claim 1, wherein said cassette shell is made of a composite of an ethylene-propylene copolymer and calcium carbonate.
- 8. The audio tape cassette according to claim 7, wherein said composite of the ethylene-propylene copolymer and calcium carbonate further includes ZnO.
- 9. The audio tape cassette according to claim 1, wherein said cassette shell is made of a composite of a phenol resin and glass fibers.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-216688 |
Aug 1989 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/569,973, filed on Aug. 20, 1990, now abandoned.
US Referenced Citations (10)
Continuations (1)
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Number |
Date |
Country |
Parent |
569973 |
Aug 1990 |
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