Electroacoustic transducer with improved shock protection
First Claim
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1. An electroacoustic transducer comprising:
- first and second permanent magnets retained in spaced apart relation by a yoke;
a coil having a tunnel aligned with a space between the magnets; and
an armature having an elongated portion that extends through the coil tunnel and at least partially between the first and second magnets, the armature mounted for deflection between the magnets in response to an excitation signal applied to the coil,the elongated portion of the armature includes a stamped protrusion on opposite sides thereof, the stamped protrusions offset relative to each other and arranged transversely with respect to a long dimension of the armature,wherein the stamped protrusions contact a portion of the transducer when the transducer is subject to impact.
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Abstract
An electroacoustic transducer includes an armature that is mounted for deflection between magnets where an elongated portion of the armature includes a protrusion on opposite sides thereof for limiting the deflection of the armature. The protrusions are arranged transversely with respect to the elongated portion of the armature. Among other advantages, deflection of the armature is limited to provide improved shock performance. In one example, the protrusions are located within a magnet zone of the electroacoustic transducer.
71 Citations
20 Claims
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1. An electroacoustic transducer comprising:
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first and second permanent magnets retained in spaced apart relation by a yoke; a coil having a tunnel aligned with a space between the magnets; and an armature having an elongated portion that extends through the coil tunnel and at least partially between the first and second magnets, the armature mounted for deflection between the magnets in response to an excitation signal applied to the coil, the elongated portion of the armature includes a stamped protrusion on opposite sides thereof, the stamped protrusions offset relative to each other and arranged transversely with respect to a long dimension of the armature, wherein the stamped protrusions contact a portion of the transducer when the transducer is subject to impact. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An electroacoustic transducer comprising:
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first and second magnets mounted in spaced apart relation; a coil having a tunnel disposed therethrough and aligned with the space between the magnets; and an elongated armature extending through the coil, the armature having a portion deflectable between the first and second magnets, the elongated portion of the armature including a protrusion on opposite sides thereof for limiting movement of the armature, wherein the protrusions are located and sized so that each protrusion contacts a corresponding portion of the transducer at a same time another portion of the armature contacts the first or second magnet when the transducer is over-deflected. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. An electroacoustic transducer comprising:
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a yoke retaining first and second magnets in spaced apart relation; an electrical coil having a passage aligned with a space between the first and second magnets; an armature having an elongated portion extending through the passage of the coil and between the first and second magnets, a portion of the armature free to deflect between the first and second magnets upon application of an excitation signal to the coil; the armature having a first pressed protrusion on a first side of the armature and a second pressed protrusion on a second side of the armature opposite the first side, the first and second pressed protrusions arranged transversely with respect to the elongated portion of the armature, the first pressed protrusion sized and positioned to contact a first portion of the transducer when a first corresponding portion of the armature contacts the first magnet, and the second pressed protrusion sized and positioned to contact a second portion of the transducer when a second corresponding portion of the armature contacts the second magnet. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification