Back to results
US 6,778,677 B2Granted
Repairable electromagnetic linear motor for loudspeakers and the like
OwnerC. Ronald Coffininventor
Life of this patent
Estimating the term…
Abstract
An electronic linear motor particularly for use with loudspeakers includes first and second annular counterfacing air gaps centered on a motor axis. An armature and spider carry first and second voice coils in the first and second annular air gaps, respectively. A rigid link connects the armature and an output device, such as a loudspeaker cone. A releasable coupling attaches either or both ends of the rigid link to an adjacent armature or output device.
Claims23
A loudspeaker comprising:
- A) a loudspeaker basket,
- B) a loudspeaker cone suspended from said loudspeaker basket for displacement along a loudspeaker axis,
- B) first and second magnet structures that define first and second annular magnetic air gaps, respectively
- C) a motor frame supporting said first and second magnet structures on the loudspeaker frame with the first and second annular magnetic air gaps in a counterfacing relationship and centered on the loudspeaker axis,
- D) first and second voice coils for being energized by alternating current signals,
- E) an armature extending along the loudspeaker axis and supporting said first and second voice coils in the first and second annular magnetic air gaps, respectively,
- F) a centering support transverse to the loudspeaker axis and attached to said motor frame and said armature for centering said armature radially on the loudspeaker axis during axial displacement of said armature along the axis, and
- G) a rigid link connecting said armature and said loudspeaker cone whereby alternating current applied to said first and second voice coils causes said loudspeaker cone to undergo a corresponding displacement and said armature is constrained to axial motion without radial displacement with respect to the loudspeaker axis.
5 more elements
Dependencies are inferred from the claim text.