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US 4,232,869 AGranted
Pickup cartridge
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTakashi Wakabayashi, Kazuhisa Morimoto
Life of this patent
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Abstract
A pickup cartridge for phonographic records, in which the damper material supporting an end portion of a cantilever is made of an elastomer comprising a blend polymer of a silicone rubber polymer and polyisobutylene. This damper material is advantageous for its high dampability and small temperature dependence of the dampability.
Claims4
A pickup cartridge comprising:
- a cantilever having a stylus mounted on one end portion thereof;
- and a damper material supporting the other end portion of said cantilever, said damper material being formed of an elastomer comprising a polymer blend of a silicone rubber polymer and polyisobutylene the blend ratio of said polymer blend is between 10 and 60 weight parts of said polyisobutylene on the basis of 100 weight parts of said silicone rubber polymer.
Dependencies are inferred from the claim text.