Back to results
US 6,611,604 B1Granted
Ultra low frequency transducer and loud speaker comprising same
AssigneeStillwater Designs and Audio, Inc.
InventorsSteven M. Irby, William O. Doering
Life of this patent
Estimating the term…
Abstract
An ultra low frequency transducer or subwoofer for automotive speaker systems with a rectangular or square, concave diaphragm. The square periphery preferably is sized to be substantially coextensive with the front of the speaker housing or cabinet. In this way, air displacement in the subwoofer is maximized for a given size of enclosure, and thus so is the loudness of the speaker. The transducer typically includes a frame or basket with a square front for supporting the periphery of the diaphragm. The preferred diaphragm includes a convex surround with pleated corners. For increased durability, trusses are formed in the diaphragm.
Claims70
An ultra low frequency transducer comprising:
- a basket having a square front opening;
- a driver assembly supported by the basket comprising a permanent magnet and a reciprocally supported voice coil, the voice coil connectable to a signal source, whereby the driver assembly is adapted to convert signals from the signal source into long reciprocating axial motion of the voice coil;
- a diaphragm with a square periphery and a center portion, the center portion being linked for movement with the voice coil to produce long excursions of the diaphragm;
- and
- a square flexible surround between the periphery of the diaphragm and the front opening of the basket, the surround comprising four straight side sections of equal length with four curved corner sections between adjacent side sections, the surround being curved in normal cross section defining an arc, the surround having at least one pleat in each corner section, the pleat longitudinally defining an arc concentric to the arc of the surround, and wherein the straight side sections of the surround are substantially free of pleats.
2 more elements
A loud speaker comprising:
- an enclosure;
- an ultra low frequency transducer supported in the enclosure, the transducer comprising:
- a basket having a square front opening;
- a driver assembly supported by the basket comprising a permanent magnet and a reciprocally supported voice coil, the voice coil connectable to a signal source, whereby the driver assembly is adapted to convert signals from the signal source into long reciprocating axial motion of the voice coil;
- a diaphragm with a square periphery and a center portion, the center portion being linked for movement with the voice coil to produce long excursions of the diaphragm;
- and
- a square flexible surround between the periphery of the diaphragm and the front opening of the basket, the surround comprising four straight side sections of equal length with four curved corner sections between adjacent side sections, the surround being curved in normal cross section defining an arc, the surround having at least one pleat in each corner section, the pleat longitudinally defining an arc concentric to the arc of the surround, and wherein the straight side sections of the surround are substantially free of pleats.
4 more elements
An ultra low frequency transducer comprising:
- a basket having a square front opening;
- a driver assembly supported by the basket comprising a permanent magnet and a reciprocally supported voice coil, the voice coil connectable to a signal source, whereby the driver assembly is adapted to convert signals from the signal source into long reciprocating axial motion of the voice coil;
- a diaphragm with a square periphery and a center portion, the center portion being linked for movement with the voice coil to produce long excursions of the diaphragm;
- and
- a square flexible surround between the periphery of the diaphragm and the front opening of the basket, the surround comprising four straight side sections of equal length with four curved corner sections between adjacent side sections, the surround being curved in normal cross section defining an arc, the surround having at least one pleat in each corner section, the pleat longitudinally defining an arc concentric to the arc of the surround, and wherein the surround is without circumferential pleats.
2 more elements
A loud speaker comprising:
- an enclosure;
- an ultra low frequency transducer supported in the enclosure, the transducer comprising:
- a basket having a square front opening;
- a driver assembly supported by the basket comprising a permanent magnet and a reciprocally supported voice coil, the voice coil connectable to a signal source, whereby the driver assembly is adapted to convert signals from the signal source into long reciprocating axial motion of the voice coil;
- a diaphragm with a square periphery and a center portion, the center portion being linked for movement with the voice coil to produce long excursions of the diaphragm;
- and
- a square flexible surround between the periphery of the diaphragm and the front opening of the basket, the surround comprising four straight side sections of equal length with four curved corner sections between adjacent side sections, the surround being curved in normal cross section defining an arc, the surround having at least one pleat in each corner section, the pleat longitudinally defining an arc concentric to the arc of the surround, and wherein the surround is without circumferential pleats.
4 more elements
An ultra low frequency transducer comprising:
- a basket having a square front opening;
- a driver assembly supported by the basket comprising a permanent magnet and a reciprocally supported voice coil, the voice coil connectable to a signal source, whereby the driver assembly is adapted to convert signals from the signal source into long reciprocating axial motion of the voice coil;
- a diaphragm with a square periphery and a center portion, the center portion being linked for movement with the voice coil to produce long excursions of the diaphragm;
- and
- a square flexible surround between the periphery of the diaphragm and the front opening of the basket, the surround comprising four straight side sections of equal length with four curved corner sections between adjacent side sections, each corner section of the surround forming an arc extending between the adjacent side sections, the surround having at least one pleat in each corner section, the length of the at least one pleat extending radially to the arc formed by the corner section, and wherein the side sections of the surround are substantially free of pleats.
2 more elements
A loud speaker comprising:
- an enclosure;
- an ultra low frequency transducer supported in the enclosure, the transducer comprising:
- a basket having a square front opening;
- a driver assembly supported by the basket comprising a permanent magnet and a reciprocally supported voice coil, the voice coil connectable to a signal source, whereby the driver assembly is adapted to convert signals from the signal source into long reciprocating axial motion of the voice coil;
- a diaphragm with a square periphery and a center portion, the center portion being linked for movement with the voice coil to produce long excursions of the diaphragm;
- and
- a square flexible surround between the periphery of the diaphragm and the front opening of the basket, the surround comprising four straight side sections of equal length with four curved corner sections between adjacent side sections, each corner section of the surround forming an arc extending between the adjacent side sections, the surround having at least one pleat in each corner section, the length of the at least one pleat extending radially to the arc formed by the corner section, and wherein the side sections of the surround are substantially free of pleats.
4 more elements
An ultra low frequency transducer comprising:
- a basket having a square front opening;
- a driver assembly supported by the basket comprising a permanent magnet and a reciprocally supported voice coil, the voice coil connectable to a signal source, whereby the driver assembly is adapted to convert signals from the signal source into long reciprocating axial motion of the voice coil;
- a diaphragm with a square periphery and a center portion, the center portion being linked for movement with the voice coil to produce long excursions of the diaphragm;
- and
- a square flexible surround between the periphery of the diaphragm and the front opening of the basket, the surround comprising four straight side sections of equal length with four curved corner sections between adjacent side sections, each corner section of the surround forming an arc extending between the adjacent side sections, the surround having at least one pleat in each corner section, the length of the at least one pleat extending radially to the arc formed by the corner section, and wherein the surround is without circumferential pleats.
2 more elements
A loud speaker comprising:
- an enclosure;
- an ultra low frequency transducer supported in the enclosure, the transducer comprising:
- a basket having a square front opening;
- a driver assembly supported by the basket comprising a permanent magnet and a reciprocally supported voice coil, the voice coil connectable to a signal source, whereby the driver assembly is adapted to convert signals from the signal source into long reciprocating axial motion of the voice coil;
- a diaphragm with a square periphery and a center portion, the center portion being linked for movement with the voice coil to produce long excursions of the diaphragm;
- and
- a square flexible surround between the periphery of the diaphragm and the front opening of the basket, the surround comprising four straight side sections of equal length with four curved corner sections between adjacent side sections, the surround being curved in normal cross section defining an arc, the surround having at least one pleat in each corner section, the pleat longitudinally defining an arc concentric to the arc of the surround, and wherein the surround is without circumferential pleats.
4 more elements
Dependencies are inferred from the claim text.