Loudspeaker damper and loudspeaker
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsMitsukazu Kuze, Hiroyuki Takewa, Kazue Satoh, Mikio Iwasa
Life of this patent
Estimating the term…
Abstract
A damper 3A is provided with an inner peripheral waveform portion 11 and an outer peripheral waveform portion 12. A flat portion 10 is provided between the inner peripheral waveform portion 11 and the outer peripheral waveform portion 12. When the damper is used for a loudspeaker, the flat portion 10 does not elastically deform in a radial direction R, so that linearity of the damper 3A in a vibrating direction Z is ensured by elastic deformation of the waveform portions. In addition, a rolling phenomenon of a voice coil bobbin and a diaphragm can be suppressed.
Claims18
A loudspeaker damper for use in a loudspeaker having a diaphragm and a voice coil bobbin, said damper including:
- an annular member so as to have a central opening portion for connecting to the voice coil bobbin, said annular member comprising:
- an outer peripheral waveform portion which has at least one concave or convex annular waveform at an outer peripheral portion;
- an inner peripheral waveform portion which has at least one concave or convex annular waveform at an inner peripheral portion around said central opening portion;
- and
- a flat portion which is provided between said outer peripheral waveform portion and said inner peripheral waveform portion and has an annular flat surface.
A loudspeaker comprising:
- a loudspeaker frame;
- a diaphragm which has an outer peripheral portion held by said loudspeaker frame with an edge so as to vibrate and applies aerial vibration;
- a cylindrical voice coil bobbin which is coupled to an inner peripheral portion of said diaphragm;
- a voice coil which is wound around said voice coil bobbin;
- a magnetic circuit which applies an electromagnetic force to said voice coil;
- and
- a damper which has an outer peripheral portion held by said loudspeaker frame so as to vibrate and which has a central opening portion to hold said voice coil bobbin in the central opening so as to axially vibrate, wherein
- said damper includes:
- an outer peripheral waveform portion which has at least one concave or convex annular waveform at an outer peripheral portion;
- an inner peripheral waveform portion which has at least one concave or convex annular waveform at an inner peripheral portion around the central opening portion;
- and
- a flat portion which is provided between said outer peripheral waveform portion and said inner peripheral waveform portion and has an annular flat surface.
A loudspeaker comprising:
- a loudspeaker frame;
- a diaphragm which has an outer peripheral portion is held by said loudspeaker frame with an edge so as to vibrate and applies aerial vibration;
- a cylindrical voice coil bobbin which is coupled to an inner peripheral portion of said diaphragm;
- a voice coil which is wound around said voice coil bobbin;
- a magnetic circuit which applies an electromagnetic force to said voice coil;
- and
- first and second dampers which have outer peripheral portions held by said loudspeaker frame so as to freely vibrate, have inner peripheral portions fixed to two different axial positions of said voice coil bobbin, and have a central opening portion, respectively to hold said voice coil bobbin in the central opening so as to axially vibrate, wherein
- said first and second dampers include:
- an outer peripheral waveform portion which has at least one concave or concave annular waveform at an outer peripheral portion;
- an inner peripheral waveform portion which has at least one concave or convex annular waveform at an inner peripheral portion around the central opening portion;
- and
- a flat portion which is provided between said outer peripheral waveform portion and said inner peripheral waveform portion and has an annular flat surface.
Dependencies are inferred from the claim text.