High density recording playback element construction
AssigneeTED Bildplatten Aktiengesellschaft AEG-Telefunken-Teldec
InventorBodo Schultz
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Abstract
In a pickup for the playback of a high density signal recording stored at the surface of a record carrier, which pickup includes a scanning element and a mechanical-electrical pressure transducer connected to the scanning element by a layer of adhesive, undesired vibrations of structural parts of the pickup during playback are prevented by providing at least that part of the surface of the pickup where the pressure transducer is connected to the scanning element with a layer of a hardened casting mass, which is applied in the liquid state in which it has a viscosity of between 5 and 50 cP at 20.degree.C. Preferably, the remainder of the surface of the pickup is also covered with such a coating, with the exception of the scanning surface of the scanning element.
Claims8
In a pickup for a high density signal recording including a mechanical-electrical pressure transducer and a scanning element fastened thereto and presenting a scanning surface, the improvement comprising a layer of a hardened casting mass forming a coating on that part of the surface of said pickup where said pressure transducer is connected to said scanning element, said mass being of a material which, in the liquid state prior to becoming hardened, has a viscosity of from 5 to 50 cP.
Dependencies are inferred from the claim text.