Precision machinery component
AssigneeHitachi, Ltd.
InventorsMasatsugu Ogata, Hideki Asano, Tsuneo Narusawa, Toshikazu Narahara
Life of this patent
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Abstract
Precision machinerycomponents such as a cylinder in a magnetic tape scanning apparatus, a cylinder base and/or a sub-chassis in a video tape recorder, etc. made of cured thermosetting resin composition comprising (A) a resin component comprising, particularly preferably, a terephthalic acid series unsaturated polyester resin, styrene and a saturated polyester resin, (B) an inorganic filler, and (C) short fibrous material such as carbon short fibers, have excellent dimensional accuracy and dimensional stability. When these precision machinery components are used, for example, in a video tape recorder, the same clear VTR picture as in the case of using those made of metal can be obtained.
Claims23
In a magnetic tape scanning apparatus comprising a magnetic head assembly containing a magnetic head and a tape guide drum, a base supporting said assembly and a chassis fixing said base, the improvement wherein said tape guide drum is made of a cured thermosetting resin composition which contains a reinforcing material and has a glass transition temperature of 90.degree. C. or higher and further wherein said thermosetting resin composition comprises (A) a thermosetting resin, (B) an inorganic filler and (C) an antistatic agent.
In a video tape recorder comprising:
- a tape guide drum,
- a tape guide drum base,
- a sub-chassis, and
- a main chassis,
- the improvement wherein the tape guide drum is made of a molded cured thermosetting resin composition which contains a reinforcing material and has a glass transition temperature of 90.degree. C. or higher and further wherein said thermosetting resin composition comprises (A) a thermosetting resin, (B) an inorganic filler and (C) an antistatic agent.
A molded tape guide drum for use in a magnetic tape scanning apparatus, said tape guide drum being made of a cured thermosetting resin composition which contains a reinforcing material and which has a glass transition temperature of 90.degree. C. or higher, wherein the cured thermosetting resin composition further comprises (A) a thermosetting resin, (B) an inorganic filler and (C) an antistatic agent.
A molded tape guide drum base supporting a tape guide drum for use in a magnetic tape scanning apparatus, said tape guide drum being made of a cured thermosetting resin composition which contains a reinforcing material and which has a glass transition temperature of 90.degree. C. or higher, wherein the cured thermosetting resin composition further comprises (A) a thermosetting resin, (B) an inorganic filler and (C) an antistatic agent.
A molded sub-chassis supporting a tape guide drum base for use in a magnetic tape scanning apparatus, said tape guide drum being made of a cured thermosetting resin composition which contains a reinforcing material and which has a glass transition temperature of 90.degree. C. or higher, wherein the cured thermosetting resin composition further comprises (A) a thermosetting resin, (B) an inorganic filler and (C) an antistatic agent.
A sub-chassis and tape guide drum base molded into one piece for use in a magnetic tape scanning apparatus, said one piece sub-chassis and tape guide drum base being made of a cured thermosetting resin composition which contains a reinforcing material and which has a glass transition temperature of 90.degree. C. or higher, wherein the cured thermosetting resin composition further comprises (A) a thermosetting resin, (B) an inorganic filler and (C) an antistatic agent.
A molded lower guide drum for use in a magnetic tape scanning apparatus, said tape guide drum being made of a cured thermosetting resin composition which contains a reinforcing material and which has a glass transition temperature of 90.degree. C. or higher, wherein the cured thermosetting resin composition further comprises (A) a thermosetting resin, (B) an inorganic filler and (C) an antistatic agent.
A molded upper guide drum for use in a magnetic tape scanning apparatus, said tape guide drum being made of a cured thermosetting resin composition which contains a reinforcing material and which has a glass transition temperature of 90.degree. C. or higher, wherein the cured thermosetting resin composition further comprises (A) a thermosetting resin, (B) an inorganic filler and (C) an antistatic agent.
Dependencies are inferred from the claim text.