Undertaking
Patent
1977-04-14
1978-10-03
Stephan, Steven L.
Undertaking
274 9C, G11B 328, G11B 340
Patent
active
041180380
ABSTRACT:
A phonograph of the type wherein a plastics-made tone arm having an upstanding stylus mounted thereon is pivoted eccentrically on a turntable or rotor, under which a speaker is mounted concentrically for simultaneous rotation therewith relative to a record immovably supported above the turntable. Also mounted on the turntable is a metal-made vibration transmitter rod which is substantially pivotally supported at one end and which rests, at a point intermediate both ends thereof, on the armature of the speaker partly exposed through an aperture in the turntable. The tone arm has its free end resting on the vibration transmitter rod for sliding movement, during playback, from the other end of the rod toward its point of contact with the speaker armature. In order to preclude unnecessary changes in the volume of sound generated by the speaker during playback, the distance between the stylus and the variable point of contact of the tone arm with the vibration transmitter rod is made to decrease, with the progress of playback, in as exact proportion as feasible to the distance between the mentioned variable point and the fixed point of contact of the rod with the speaker armature.
REFERENCES:
patent: 3712629 (1973-01-01), Watanabe
patent: 3825268 (1974-07-01), Halland et al.
Stephan Steven L.
Yugen Kaisha Watanabe Kenkusho
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