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US 12,532,125 B2Granted
Speaker
AssigneeAlps Alpine Co., Ltd.
InventorsRyo Ito, Yuji Saito, Katsuhiko Egami, Hiroki Toita
Life of this patent
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Abstract
A magnetic circuit section having a main magnetic gap and sub-magnetic gaps is used. A vibrator is vibrated by an electromagnetic force generated by a voice current, which flows through a voice coil and a magnetic flux crossing the main magnetic gap. When the voice coil approaches or enters a sub-magnetic gap, the voice current which flows through the voice coil is reversed, temporarily cut-off or attenuated.
Claims10
A speaker comprising:
- a vibrator having a vibration plate and a voice coil;
- a magnetic circuit section configured to form a magnetic flux crossing the voice coil;
- and,
- a detector configured to detect a movement of the vibrator,
- wherein the magnetic circuit section is provided with two magnets disposed with a space in a vibration direction of the voice coil, a main magnetic gap formed in a middle between the two magnets, and a sub-magnetic gap formed spaced from the main magnetic gap with at least one of the magnets interposed between the gaps,
- wherein between the main magnetic gap and the sub-magnetic gap, directions of magnetic fluxes crossing the voice coil movable inside the gaps are opposite, and
- wherein a vibration controller is configured to reverse a direction of a current applied to the voice coil, when the detector detects that the voice coil has moved a predetermined distance from the main magnetic gap to the sub-magnetic gap.
4 more elements
A speaker comprising:
- a vibrator having a vibration plate and a voice coil;
- a magnetic circuit section configured to form a magnetic flux crossing the voice coil;
- and,
- a detector configured to detect a movement of the vibrator,
- wherein the magnetic circuit section is provided with two magnets disposed with a space in a vibration direction of the voice coil, a main magnetic gap formed in a middle between the two magnets, and a sub-magnetic gap formed spaced from the main magnetic gap with at least one of the magnets interposed between the gaps,
- wherein between the main magnetic gap and the sub-magnetic gap, directions of magnetic fluxes crossing the voice coil movable inside the gaps are opposite, and
- wherein a vibration controller is configured to temporarily cut-off or attenuate a current applied to the voice coil, when the detector detects that the voice coil has moved a predetermined distance from the main magnetic gap to the sub-magnetic gap.
4 more elements
Dependencies are inferred from the claim text.