Voice coil and speaker
View Patent ↗A voice coil includes a bobbin formed of a wooden sheet obtained by slicing natural wood to a predetermined thickness and a coil that surrounds an outer circumference of the bobbin.
1. A voice coil comprising:
a bobbin formed of a wooden sheet obtained by slicing natural wood to a predetermined thickness; and
a coil which surrounds an outer circumference of the bobbin,
wherein the bobbin has a fiber direction in a direction substantially perpendicular to a winding direction of the coil.
2. The voice coil of claim 1 , wherein the predetermined thickness of the bobbin is in a range of from 0.06 mm to 0.6 mm.
3. The voice coil of claim 1 , further comprising a reinforcing sheet provided on a back side of the wooden sheet.
4. The voice coil of claim 3 , wherein the reinforcing sheet is a paper.
5. The voice coil of claim 3 , wherein a thickness of the reinforcing sheet is in a range of from 0.03 mm to 0.1 mm.
6. A speaker comprising:
a bobbin formed of a wooden sheet obtained by slicing natural wood to a predetermined thickness;
a coil which surrounds an outer circumference of the bobbin;
a diaphragm connected to an end portion of the coil; and
a magnetic circuit magnetically connected to the coil,
wherein the bobbin has a fiber direction in a direction substantially perpendicular to a winding direction of the coil.
7. The speaker of claim 6 , wherein the predetermined thickness of the bobbin is in a range of from 0.06 mm to 0.6 mm.
8. The speaker of claim 6 , further comprising a reinforcing sheet provided on a back side of the wooden sheet.
9. The speaker of claim 8 , wherein the reinforcing sheet is a paper.
10. The voice coil of claim 8 , wherein a thickness of the reinforcing sheet is in a range of from 0.03 mm to 0.1 mm.