| 摘要 |
A toy phonograph wherein mechanical vibrations of the tone arm in response to tracking by its stylus of a sound groove in a rotating record are transmitted to the loudspeaker diaphragm by means of a two-armed follower which is pivotably mounted on the tone arm and has a shorter arm engaging a contact plate on the central portion of the diaphragm and a longer arm which is biased by a spring to maintain the shorter arm in engagement with the contact plate. The ratio of the pressure with which the stylus engages the record to the pressure between the shorter arm and the contact plate is about three to one and the ratio of the lengths of the two follower arms approximates the ratio of the force with which the stylus bears against the record to the average force with which the spring acts on the longer arm. The point of engagement between the shorter arm and the contact plate of the diaphragm is in line with the axis of the stylus. |
