Alignment device for electro-acoustical transducers

DETAILED DESCRIPTION A primary object of the subject invention is to provide new and improved electro-acoustical transducers.
Another object is to provide a loudspeaker capable of longer axial excursions so as to generate relatively higher levels of audible bass frequency tones and a higher acoustic level of combined frequency tones.
A more particular object is to provide loudspeakers capable of greater excursions (eg greater than .
+-.
1 inch), of a more rigid diaphragm in order to produce "deeper" bass frequencies, higher acoustic outputs over a range of low and middle frequencies, and less amplitude and intermodulation distortion.
A further object is to provide electro-acoustical transducers which have magnetic structures that provide performance and efficiency improvements.
A further object is to provide a loudspeaker system capable of longer excursions before significant non-linearity is met in the axial restoring system (suspension elements), of generating lower levels of amplitude distortion at higher levels of acoustic output and of generating lower levels of amplitude distortion when radiating bass frequencies.
An additional object is to provide an improved loudspeaker of a rigid diaphragm design which reduces intermodulation and amplitude distortion due to antiphase diaphragm movement (cone breakup).
The subject invention relates to electro-acoustical energy transducers such as loudspeakers, headphones, and microphones of the type which have a voice coil assembly, a diaphragm coupled to the voice coil, a permanent magnet arrangement for providing a magnetic field in an air gap, and support means for axially centering the voice coil assembly in the air gap and for allowing the axial movement of the voice coil assembly and the diaphragm.
In the case of loudspeakers and headphones, the axial movement of the voice coil assembly is in response to the magnetic interaction between the magnetic field produced by the voice coil and the permanent magnet arrangement.
In accordance with one embodiment of the subject invention, the permanent magnet arrangement comprises two concentrically disposed cylindrically shaped permanent magnets for providing a high intensity magnetic field in the air gap