Speaker
AssigneeAlps Alpine Co., Ltd.
InventorKatsuhiko Egami
Life of this patent
Estimating the term…
Abstract
A through hole is formed in an inner-side yoke making up a magnetic circuit portion, passing therethrough following a vibration direction of a vibration unit, and circuit boards are disposed in the through hole. The circuit boards are disposed with board surfaces thereof following the vibration direction of the vibration unit. Also, an opening area of a middle space across which the circuit boards oppose each other is larger than opening areas of side spaces. Accordingly, flow quantity of air through the through hole can be obtained, increase in air resistance at the time of vibration of the vibration unit can be suppressed, and also wind velocity can be obtained, whereby cooling effects of heat-generating components mounted on the circuit boards can be improved.
Claims14
A speaker, comprising:
- a vibration unit, including a diaphragm and a voice coil;
- and
- a magnetic circuit portion that applies a magnetic flux to the voice coil,
- wherein the magnetic circuit portion includes an inner-side yoke, an outer-side yoke that is positioned on an outer side of the inner-side yoke, a magnetic gap that is formed at an opposing portion of the inner-side yoke and the outer-side yoke, and a magnet that is positioned on the outer side of the inner-side yoke and forms the magnetic flux that traverses the voice coil that is positioned in the magnetic gap,
- wherein a through hole formed in the inner-side yoke that passes therethrough following a vibration direction of the vibration unit,
- wherein a circuit board on which a heat-generating component is mounted is disposed inside the through hole;
- wherein a cap that covers an inner space of a coil bobbin that includes the voice coil is provided to the vibration unit, and
- wherein the through hole communicates with an operation space that is surrounded by the coil bobbin and the cap.
A speaker, comprising:
- a vibration unit, including a diaphragm and a voice coil;
- and
- a magnetic circuit portion that applies a magnetic flux to the voice coil,
- wherein the magnetic circuit portion includes an inner-side yoke, an outer-side yoke that is positioned on an outer side of the inner-side yoke, a magnetic gap that is formed at an opposing portion of the inner-side yoke and the outer-side yoke, and a magnet that is positioned on the outer side of the inner-side yoke and forms the magnetic flux that traverses the voice coil that is positioned in the magnetic gap,
- wherein a through hole formed in the inner-side yoke that passes therethrough following a vibration direction of the vibration unit,
- wherein a circuit board on which a heat-generating component is mounted is disposed inside the through hole, and,
- wherein the circuit board is disposed with a board surface thereof following the vibration direction of the vibration unit.
Dependencies are inferred from the claim text.