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US 9,438,999 B2Granted
Acoustic transducer assembly
AssigneeHarman Becker Gepkocsirendszer Gyarto Korlatolt Felelossegu Tarsasag
InventorJohn B. French
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Abstract
Driver for an acoustic transducer having a moving coil of substantially equal length to the air gap. The air gap may itself be extended in length using an upper or lower lip, or both. A stationary coil is also provided. The moving and stationary coils can be controlled by suitable control blocks to form an electromagnet-based transducer with reduced distortion. The acoustic transducer may be a hybrid acoustic transducer.
Claims27
A driver for an acoustic transducer comprising:
- a moving diaphragm;
- a driver body formed of magnetic material and a permanent magnet, the driver body comprising:
- a center post composed of a first post portion formed of the magnetic material and a second post portion formed of the permanent magnet;
- an outer wall coupled to the center post via a bottom portion of the driver body;
- and
- an annular plate extending inwardly toward the center post from the outer wall;
- a moving coil coupled to the diaphragm, the moving coil disposed at least partially within an air gap formed between the annular plate and the center post;
- and
- a stationary coil disposed within a cavity defined by the annular plate, outer wall, bottom portion and center post,
- wherein the annular plate includes a first lip that extends into the air gap, and
- wherein the first lip is positioned between the moving coil and the stationary coil in the air gap.
8 more elements
Dependencies are inferred from the claim text.