Diaphragm for loud speaker and loud speaker employing it
View Patent ↗The present invention provides a diaphragm for a loudspeaker which suppresses divided resonance and shows a stable sound-pressure-frequency characteristic, and a loudspeaker using the diaphragm. The diaphragm includes three or more thick parts ( 11 c ) of odd numbers formed radially from a center part to an outer periphery, and semi thick part ( 11 d ) formed between the thick parts so as to become thinner gradually from the outer periphery to the center part. Web shaped thin part ( 11 e ) is formed at an inner part of the semi thick part.
1. A diaphragm for a loudspeaker comprising:
an odd number of three or more thick parts extending radially from a center part to an outer periphery; and
interlevel parts formed between the thick parts, wherein a thickness of the interlevel parts between the thick parts gradually decreasing from the outer periphery to the center part.
2. The diaphragm for a loudspeaker of claim 1 ,
wherein the interlevel parts between the thick parts includes a thin part at an inner part thereof.
3. The diaphragm for a loudspeaker of claim 1 ,
wherein the thick parts are are formed at a rear surface of the diaphragm and a front surface of the diaphragm is neither convex nor concave.
4. A loudspeaker comprising:
a magnetic circuit;
a frame coupled with the magnetic circuit;
a voice coil held in a magnetic gap formed at the magnetic circuit; and
a diaphragm whose inner periphery is coupled with the voice coil and outer periphery is coupled with the frame via an edge;
wherein the diaphragm includes an odd number of three or more thick parts extending radially from a center part to an outer periphery, and
interlevel parts between the thick parts,
a thickness of the interlevel parts between the thick parts becomes gradually decrease from the outer periphery to the center part.
5. The loudspeaker of claim 4 ,
wherein the interlevel parts between the thick parts each includes a constant thickness portion at an inner part thereof.