Invention Grant
- Patent Title: Moving coil motor arrangement with a sound outlet for reducing magnetic particle ingress in transducers
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Application No.: US14463467Application Date: 2014-08-19
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Publication No.: US09661420B2Publication Date: 2017-05-23
- Inventor: Scott P. Porter , Ruchir M. Dave , Christopher R. Wilk
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Blakely, Sokoloff, Taylor & Zafman LLP
- Main IPC: H04R9/02
- IPC: H04R9/02 ; H04R9/04 ; H04R1/02

Abstract:
An electromechanical transducer including a magnetic circuit having a magnet configured to generate a magnetic field and a magnetic gap into which a voice coil associated with a diaphragm is at least partially inserted, the magnetic field having a primary flux component and a secondary flux component. The transducer further including a housing positioned around the magnetic circuit, the housing having an acoustic spout whose sound outlet opening is positioned outside of a portion of the magnetic field that is dominated by the primary flux component. A transducer including an enclosure having a top wall, a bottom wall, at least one side wall connecting the top wall to the bottom wall and an acoustic spout extending from the top wall or the bottom wall, a diaphragm, a voice coil and a magnet assembly having a ring magnet and a gap within which the voice coil is positioned.
Public/Granted literature
- US20160057541A1 MOVING COIL MOTOR ARRANGEMENT WITH A SOUND OUTLET FOR REDUCING MAGNETIC PARTICLE INGRESS IN TRANSDUCERS Public/Granted day:2016-02-25
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