EP 0771133 A1 19970502 - Multiple cone electroacoustic transducer
Title (en)
Multiple cone electroacoustic transducer
Title (de)
Elektroakustischer Wandler mit mehreren Konussen
Title (fr)
Transducteur électroacoustique à cÔnes multiples
Publication
Application
Priority
US 54947295 A 19951027
Abstract (en)
A loudspeaker comprises a motor stator (12) defining an air gap (32). The stator provides a magnetic field in the air gap. A former (14) supports a voice coil (30) through which current to be transduced into audio is to be passed in the air gap. A first diaphragm (34) is fixed to the former at a first position a first distance (38) from the front plate (20) of the stator along the length of the former. The first diaphragm has a first outer perimeter (56). A first compliance (54) for permitting relative movement between the first outer perimeter and an outer frame (16) couples the first outer perimeter to the frame (16). A first opening (40) in the frame vents air from a first face (44) of the first diaphragm. A second opening (46) in the frame vents air from a second face (48) of the first diaphragm. A second diaphragm (134) is fixed to the former at a second position a second distance (138) from the front plate (20) of the stator greater than the first distance along the length of the former. The second diaphragm has a second outer perimeter (156). A second compliance (154) permitting relative movement between the second outer perimeter and the frame couples the second outer perimeter to the frame. A third opening (140) in the frame vents air from a first face (144) of the second diaphragm. A first partition (64) disposed between the second face of the first diaphragm and the first face of the second diaphragm provides a fourth opening (66) through which the former extends. The fourth opening lies between the first and second positions. <IMAGE>
IPC 1-7
IPC 8 full level
H04R 1/24 (2006.01); H04R 9/06 (2006.01); H04R 27/00 (2006.01)
CPC (source: EP)
H04R 9/063 (2013.01)
Citation (applicant)
- US 4118605 A 19781003 - KOBAYASHI FUMIO
- US 4567959 A 19860204 - PROPHIT DAVID A [US]
- US 4590333 A 19860520 - STROHBEEN JOHN [US]
- US 4908601 A 19900313 - HOWZE BRUCE W [US]
- US 5097513 A 19920317 - JORDAN JON C [US], et al
- US 5119431 A 19920602 - HAMBY WILLIAM H [US]
- US 5295194 A 19940315 - CHRISTENSEN EUGENE J [US]
- US 5327985 A 19940712 - PORZILLI LOUIS [US]
- US 4531025 A 19850723 - DANLEY THOMAS J [US], et al
- US 4757547 A 19880712 - DANLEY THOMAS J [US]
- US 4763358 A 19880809 - DANLEY THOMAS J [US]
- US 5140641 A 19920818 - DANLEY THOMAS J [US], et al
- US 5313127 A 19940517 - DANLEY THOMAS J [US], et al
- US 5317642 A 19940531 - DANLEY THOMAS J [US], et al
- US 4554414 A 19851119 - HOUSE WILLIAM N [US]
- US 1913645 A 19330613 - CONRAD STENGER WILLEBALD
Citation (search report)
- [XY] US 4039044 A 19770802 - HEIL OSKAR
- [XY] US 4107479 A 19780815 - HEIL OSKAR
- [Y] US 4552242 A 19851112 - KASHIWABARA AKIHIKO [JP]
- [Y] US 4206832 A 19800610 - YOCUM THOMAS A [US]
- [A] US 3636278 A 19720118 - HEIL OAKAR
Designated contracting state (EPC)
DE DK FR GB IT SE
DOCDB simple family (publication)
EP 0771133 A1 19970502; AU 7031596 A 19970501; CA 2188899 A1 19970428; JP H09168199 A 19970624
DOCDB simple family (application)
EP 96307675 A 19961023; AU 7031596 A 19961021; CA 2188899 A 19961025; JP 28529696 A 19961028