Sub cone and loudspeaker

1. A sub cone for use in a loudspeaker, the sub cone comprising:

a slanted portion that has an aperture area that increases toward an emission direction in which sound is emitted from the loudspeaker; and

a rim portion that is annular in shape and extends linearly outward from an edge of a distal end of the slanted portion, in a direction orthogonal to the emission direction.

2. The sub cone according to claim 1 , wherein

the slanted portion and the rim portion form a bend at a bent portion, and a length of the rim portion from the bent portion to a distal end of the rim portion is within a range of from 1 mm to 8 mm or from 1 percent to 20 percent of a maximum aperture diameter of the slanted portion.

3. The sub cone according to claim 1 , wherein

the rim portion has a density higher than a density of the slanted portion.

4. The sub cone according to claim 3 , wherein

the rim portion has a thickness less than a thickness of the slanted portion.

5. The sub cone according to claim 3 , wherein

a curing agent is applied to the rim portion.

6. The sub cone according to claim 1 , wherein

in the emission direction, a radius of curvature of the distal end of the slanted portion is longer than a radius of curvature of a base end of the slanted portion.

7. A loudspeaker comprising:

a main cone;

a magnetic circuit;

a frame that holds the magnetic circuit and the main cone;

a voice coil body including one end portion coupled to the main cone and an other end portion disposed in a magnetic gap of the magnetic circuit; and

a sub cone that is disposed in front of the main cone, in an emission direction in which sound is emitted from the loudspeaker, wherein

the sub cone includes:

a slanted portion that has an aperture area that increases toward the emission direction; and

a rim portion that is annular in shape and extends linearly outward from an edge of a distal end of the slanted portion, in a direction intersecting the emission direction.