ELECTROACOUSTIC TRANSDUCER
First Claim
1. An electroacoustic transducer including a magnet plate the entirety of which is formed to be disk-shaped or ring-shaped, and a disk-shaped or ring-shaped acoustic diaphragm provided with a planar coil disposed parallel to the magnet plate and formed by spirally winding an electric conductor;
- wherein the electroacoustic transducer is provided with at least any one of a center area magnet magnetized so that a component parallel to the center axis of the acoustic diaphragm is turned into the forward direction of the acoustic diaphragm at the position that becomes the center side of the base area magnet and an outer circumference area magnet magnetized so that a component parallel to the center axis of the acoustic diaphragm is turned into the backward direction of the acoustic diaphragm at the position that becomes the outer circumference side of the base area magnet, in addition to a base area magnet magnetized so that a component parallel to the vibration plane of the acoustic diaphragm is turned into the radius direction toward the center of the acoustic diaphragm with respect to the magnetization direction of respective partial areas of a magnet plate.
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Abstract
The invention provides an electroacoustic transducer capable of efficiently carrying out conversion from electric signals to sound or from sound to electric signals at low distortion, which requires no special shape nor processing as a magnet, requires no minute setting of the magnetization direction, and sets a distribution of higher magnetic flux densities for effective action with respect to an electric conductor of an acoustic diaphragm than in a magnet plate magnetized in the radius direction although the production process thereof is remarkably simple as in a magnet plate magnetized in the radius direction.
The electroacoustic transducer is provided with at least any one of the center area magnet magnetized so that a component parallel to the center axis of the acoustic diaphragm is turned into the forward direction of the acoustic diaphragm at the position that becomes the center side of the base area magnet and the outer circumference area magnet magnetized so that a component parallel to the center axis of the acoustic diaphragm is turned into the backward direction of the acoustic diaphragm at the position that becomes the outer circumference side of the base area magnet, in addition to a base area magnet magnetized so that a component parallel to the vibration plane of the acoustic diaphragm is turned into the radius direction toward the center of the acoustic diaphragm with respect to the magnetization direction of respective partial areas of a magnet plate.
29 Citations
7 Claims
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1. An electroacoustic transducer including a magnet plate the entirety of which is formed to be disk-shaped or ring-shaped, and a disk-shaped or ring-shaped acoustic diaphragm provided with a planar coil disposed parallel to the magnet plate and formed by spirally winding an electric conductor;
wherein the electroacoustic transducer is provided with at least any one of a center area magnet magnetized so that a component parallel to the center axis of the acoustic diaphragm is turned into the forward direction of the acoustic diaphragm at the position that becomes the center side of the base area magnet and an outer circumference area magnet magnetized so that a component parallel to the center axis of the acoustic diaphragm is turned into the backward direction of the acoustic diaphragm at the position that becomes the outer circumference side of the base area magnet, in addition to a base area magnet magnetized so that a component parallel to the vibration plane of the acoustic diaphragm is turned into the radius direction toward the center of the acoustic diaphragm with respect to the magnetization direction of respective partial areas of a magnet plate. - View Dependent Claims (3, 4, 5, 6, 7)
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2. An electroacoustic transducer including a magnet plate the entirety of which is formed to be disk-shaped or ring-shaped, and a disk-shaped or ring-shaped acoustic diaphragm provided with a planar coil disposed parallel to the magnet plate and formed by spirally winding an electric conductor;
wherein the electroacoustic transducer is provided with at least any one of a center area magnet magnetized so that a component parallel to the center axis of the acoustic diaphragm is turned into the backward direction of the acoustic diaphragm at the position that becomes the center side of the base area magnet and an outer circumference area magnet magnetized so that a component parallel to the center axis of the acoustic diaphragm is turned into the forward direction of the acoustic diaphragm at the position that becomes the outer circumference side of the base area magnet, in addition to a base area magnet magnetized so that a component parallel to the vibration plane of the acoustic diaphragm is turned into the radius direction toward the outer circumference of the acoustic diaphragm with respect to the magnetization direction of respective partial areas of a magnet plate.
Specification