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DESCRIPTION JPS6123794
[0001]
Brief description of the drawings
[0002]
FIG. 1 is a cross-sectional view of the present invention, FIGS. 2a and 2b are plan views of a
conventional example, and FIG. 3 is a directional characteristic view. IL and IR are microphone
units, 2 is an auxiliary case, 3L and 3R are front chambers, 4L and 4R are rear chambers, 5L and
5R are main sound wave introduction holes, 6L and 6R are delayed sound wave introduction
holes, 7at 7b is a cushioning material, Reference numeral 8 denotes an outer casing case, and 9
denotes a lead wire insertion hole.
10-05-2019
1