ACOUSTIC ELEMENT, ESPECIALLY SOUNDBOARD OR MASSIVE BODY OF MUSICAL INSTRUMENT

摘要

At least three boreholes (2) are made in the acoustic element, especially in the soundboard or massive body of musical instrument. The acoustic element is formed at least by one body (1) and at least by three segments (30, 31, 35, 37, 303). At least one of boreholes (2) is made in at least one body (1) and, at the same time, at least one segment (30, 31, 35, 37, 303) is arranged at least in one borehole (2) made at least in one body (1) and/or at least in one other segment. At least one segment (30, 31, 35, 37, 303) may have the shape of a rotationally symmetric body, may fully fill the inner space of the borehole (2) or may be equipped at least with one groove on its surface. At least one segment (30, 31, 35, 37, 303) may also exceed the outer surface of the body (1) in at least one direction. The axis of at least one segment (30, 31, 35, 37, 303) may be perpendicular to the massive body surface. In the assembled state, at least one cavity may occur between at least one body (1) and at least one segment (30, 31, 35, 37, 303) or between at least two segments, in cavity other segment may alternatively be found. Boreholes (2) made in at least one body (1) and/or at least in one segment may be clustered into at least one field (51, 52, 53, 54, 55). All the boreholes for which the smallest thickness of the wall (93) of the body (1) and/or segment between adjoining boreholes (2) equals at the most to the sum of the greatest widths (91, 92) of mutually compared boreholes belong to the same field (51, 52, 53, 54, 55). Boreholes made in the body (1) may not necessarily have a round cross-section but they are subject to a condition according to which the greatest width (91) of the borehole (2) in the plane perpendicular to the borehole axis does not exceed the triple of its smallest width (96). In the assembled state, the body (1) and either of segments (30, 31, 35, 37, 303) may have different acoustic characteristics in at least one direction. The depth of the borehole (2) may be larger than 1/4 of thickness of the body (1).