Balanced Armature Receiver
AssigneeKnowles Electronics, LLC
InventorsYahui Zhang, Shehab Albahri
Life of this patent
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Abstract
A balanced armature receiver including a motor with a yoke for retaining magnets and fastening to an armature are disclosed. The yoke includes a close-ended wall structure formed of a soft magnetic material having multiple folded corners defining an armature passage. A first magnet retaining wall portion of the yoke is arranged in parallel with, and opposite, a second magnet retaining wall portion, wherein at least a portion of the first magnet retaining wall portion has a reduced thickness relative to other wall portions of the close-ended wall structure. The armature is connected to the reduced thickness portion of the first magnet retaining wall portion, thereby reducing an overall z-axis dimension of the motor.
Claims21
A balanced armature receiver yoke for retaining magnets in spaced apart relation and fastening to an armature, the balanced armature receiver yoke comprising:
- a close-ended wall structure comprising multiple folded corners defining a passage through the closed-ended wall structure, the close-ended wall structure is a soft magnetic material comprising:
- a first magnet retaining wall portion;
- a second magnet retaining wall portion arranged in parallel with, and opposite, the first magnet retaining wall portion,
- at least a portion of the first magnet retaining wall portion having a reduced thickness relative to other wall portions of the close-ended wall structure.
A balanced armature receiver motor comprising:
- a close-ended wall structure comprising multiple folded corners defining an armature passage through the close-ended wall structure, the close-ended wall structure is a soft magnetic material comprising:
- a first magnet retaining wall portion;
- a second magnet retaining wall portion arranged in parallel with, and opposite, the first magnet retaining wall portion,
- the first magnet retaining wall portion having a portion with a reduced thickness compared to thicknesses of other wall portions of the close-ended wall structure;
- a first magnet located in the armature passage and fastened to the first magnet retaining wall portion, and a second magnet located in the armature passage and fastened to the second magnet retaining wall portion;
- an armature having a first portion fastened to the portion of the first magnet retaining wall portion having reduced thickness, the first portion of the armature opposite the first magnet, the armature having a second portion movably located in the armature passage between the first and second magnets;
- and
- an electrical coil assembly electromagnetically coupled to the armature.
A balanced armature receiver comprising:
- a housing having a sound port;
- a diaphragm disposed in the housing and separating the housing into a back volume and a front volume acoustically coupled to the sound port;
- a yoke comprising a close-ended wall structure having multiple folded corners defining a passage through the yoke, the close-ended wall structure is a soft magnetic material comprising:
- a first magnet retaining wall portion;
- a second magnet retaining wall portion arranged in parallel with, and opposite, the first magnet retaining wall portion,
- at least a portion of the first magnet retaining wall portion having a reduced thickness relative to other wall portions of the close-ended wall structure;
- an armature having a first portion fastened to an outer surface of the portion of the first magnet retaining wall portion having the reduced thickness, the armature having a second portion movably located between magnets retained within the passage of the yoke, the second portion of the armature connected to the diaphragm;
- and
- an electrical coil assembly disposed about the armature.
Dependencies are inferred from the claim text.