A speaker is disclosed in which a split resonance of a diaphragm main body and a natural resonance of an edge are controlled, achieving a high sound quality while realizing a weight reduction. A diaphragm is composed of a diaphragm main body and an edge. An outer peripheral part of the diaphragm main body is bonded with a peripheral edge of a frame through the edge. An external shape of edge is formed in substantially a perfect circle. While, at least one of the outer peripheral part of the diaphragm main body and an inner peripheral part of the edge, which is a mutual bonding portion, is formed in a different shape than the perfect circle.
1. A speaker comprising:
a magnetic circuit having a magnetic gap formed in a ring shape;
a frame bonded with the magnetic circuit in a central part of the frame; and
a diaphragm of which a central part is bonded with a voice coil placed in the magnetic gap in a freely movable manner and of which an outer peripheral part is bonded with a peripheral edge of the frame through an edge,
wherein an external shape of the edge bonded with the outer peripheral part of the diaphragm is formed in a circle;
wherein at least one of the outer peripheral part of the diaphragm and an inner peripheral part of the edge is formed in a different shape than the circle; and
wherein the amount of an overlap between the diaphragm and the edge varies about the voice coil.
2. The speaker of claim 1 ,
wherein the different shape than the circle is an oval or a polygon.
3. The speaker of claim 1 ,
wherein the diaphragm is composed of at least three or more of thick portions in odd number radially extended from the central part toward the outer peripheral part of the diaphragm, and a quasi-thick portion formed between the thick portions with a thickness of the quasi-thick portion becoming thinner from the outer peripheral part toward an inside of the diaphragm.
4. The speaker of claim 3 ,
wherein a thin portion is formed at an inner part of the quasi-thick portion.
5. The speaker of claim 4 ,
wherein the thick portions and the quasi-thick portions are formed at a rear side of the diaphragm.
6. The speaker of claim 3 ,
wherein the thick portions and the quasi-thick portions are formed at a rear side of the diaphragm.
7. A speaker comprising:
a magnetic circuit having a magnetic gap formed in a ring shape;
a frame bonded with the magnetic circuit in a central part of the frame; and
a diaphragm of which a central part is bonded with a voice coil placed in the magnetic gap in a freely movable manner and of which an outer peripheral part is bonded with a peripheral edge of the frame through an edge,
wherein an internal shape and an external shape of the edge, and an external shape of the diaphragm are respectively formed in a circle; and
wherein the diaphragm and the edge are overlaid with respective centers being shifted relative to each other and are bonded together.
8. The speaker of claim 7 ,
wherein the diaphragm is composed of at least three or more of thick portions in odd number radially extended from the central part toward the outer peripheral part of the diaphragm, and a quasi-thick portion formed between the thick portions with a thickness of the quasi-thick portion becoming thinner from the outer peripheral part toward an inside of the diaphragm.
9. The speaker of claim 8 ,
wherein a thin portion is formed at an inner part of the quasi-thick portion.
10. The speaker of claim 9 ,
wherein the thick portions and the quasi-thick portions are formed at a rear side of the diaphragm.
11. The speaker of claim 8 ,
wherein the thick portions and the quasi-thick portions are formed at a rear side of the diaphragm.