Keyboard device of electronic musical instrument
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United States of America Patent
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-
Jul 11, 1989
Issued Date -
N/A
app pub date -
Oct 26, 1987
filing date -
Jan 20, 1983
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A keyboard device of an electronic musical instrument has a keyboard frame, a plurality of keys which are aligned on the keyboard frame and which are vertically pivotable, a plurality of return springs each of which corresponds to one of the keys and has one end stopped by the key and the other end stopped by the keyboard frame so as to bias the key toward a nonstruck position, and a plurality of pivot members each of which is disposed on the keyboard frame at an end of a longitudinal axis of the key to correspond to one of the keys. The pivot member has a circular surface to be brought into slidable contact with a back end portion of the key so as to allow the key to perform pivotal movement. The back end portion of the key has a circular surface paired with the circular surface of the pivot member and is spring-biased against the circular surface of the pivot member by means of the return spring.
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