Linear speaker

A linear speaker comprising:

• a diaphragm vibrating in a vertical direction and extending in a first direction perpendicular to the vertical direction;
• a coil substrate having an upper end coupled to a lower surface of the diaphragm and extending in the first direction;
• a coil unit printed as a spiral wire on one side surface of the coil substrate parallel to the vertical direction and the first direction;
• a first magnet which is magnetically polarized in the vertical direction and located spaced apart from the coil substrate in a second direction perpendicular to the vertical direction and the first direction at a location facing the one side surface of the coil substrate;
• a second magnet which is magnetically polarized in the vertical direction and located spaced apart from the coil substrate in the second direction at a location facing the other side surface of the coil substrate;
• and
• a plurality of yokes coupled to upper ends and lower ends of the first magnet and the second magnet, respectively;
• wherein the plurality of yokes comprise:
• a first yoke coupled to the upper end of the first magnet,
• a second yoke coupled to the lower end of the first magnet,
• a third yoke coupled to the upper end of the second magnet, and
• a fourth yoke coupled to the lower end of the second magnet, and
• wherein the first yoke, the second yoke, the third yoke, and the fourth yoke are formed in a plate shape of a plane perpendicular to the vertical direction,
• one edge of the first yoke faces and is spaced apart from one edge of the third yoke, and
• one edge of the second yoke faces and is spaced apart from one edge of the fourth yoke;
• wherein the coil unit comprises:
• a plurality of first straight wires printed at locations facing the first yoke and the third yoke, and
• a plurality of second straight wires printed at locations facing the second yoke and the fourth yoke, and
• wherein the plurality of first straight wires are spaced apart from each other at a predetermined interval in the vertical direction and printed on a first straight area formed on the coil substrate, and
• the plurality of second straight wires are spaced apart from each other at a predetermined interval in the vertical direction and printed on a second straight area formed on the coil substrate;
• wherein thicknesses of the first yoke, the second yoke, the third yoke, and the fourth yoke are formed to be 1.5 mm to 5 mm;
• wherein each of the first straight area and the second straight area has a width in the vertical direction of 4 mm, and
• a length of the first magnet or the second magnet in the vertical direction is formed to be 92.25% to 112.75% of the width in the vertical direction of the first straight area.