Sony MDR-EX1000 Product Information page 4

Suppressing unwanted vibrations and providing high resolution sound playback:
Liquid Crystal Polymer film diaphragm
For the driver unit diaphragm material, lightness and consideration to the seemingly contradictory
features of highly rigidity vs. high internal loss is essential. Though rigidity is key in accurately
converting input signals over a wide bandwidth into sound, a high level of internal loss is also required
to suppress unnecessary vibration of the diaphragm itself.
Liquid Crystal Polymer has already been identified for some time as a material that can provide a
balanced combination of these two characteristics in high order. However, previously it could not be
used to create diaphragms for headphones due to the inability of compositions and manufacturing
methods to obtain sufficient heat resistance and the inability to achieve the thinness required for usage
in headphones, caused by a low degree of film elongation and the difficulty of formation.
To solve this problem, a highly stretchable Liquid Crystal Polymer
was successfully developed for use as a casting film using polymer
varnish. This made it possible to enable both rigidity and a high level
of internal loss over a wide bandwidth, while also providing the level
of strength required to stand up to the process of creating a thin film.
In short, a material for creating the perfect diaphragm for
reproducing accurate sound was born.
Liquid Crystal Polymer film Liquid Crystal Polymer film

(GB)