Paper-Thin Loudspeaker Developed by MIT Researchers

DEFENCE, SCIENCE & TECHNOLOGY

An energy-efficient paper-thin loudspeaker was recently developed by the researchers at the Massachusetts Institute of Technology (MIT’s) Organic and Nanostructured Electronics Laboratory.

The mountable paper-thin speakers can produce sound from any surface with minimal distortion and might even be capable of drawing in Active Noise Cancellation. The hand-sized loudspeaker which weighs about as much as a dime, can generate high-quality sound no matter what surface the film is bonded to.

The researchers used a simple fabrication technique, which requires only three basic steps and can be scaled up to produce ultrathin loudspeakers large enough to cover the inside of an automobile or to wallpaper a room. The device is well-suited for applications on smart devices where battery life is limited.

The speakers use polyvinylidene fluoride film (PVDF), which has piezoelectric properties. A perforated layer of PET plastic to the sheet of PVDF, which when treated with heat in a vacuum makes the PVDF squeeze through perforations, making several small domes. Besides, the PET layers provide structural integrity for the material to bend and be attached to walls without interfering with the sound.

 

   Important points for the exam:

  • Massachusetts Institute of Technology (MIT) researchers recently developed an energy-efficient paper-thin loudspeaker. 
  • It was developed by the researchers at MIT’s Organic and Nanostructured Electronics Laboratory.
  • Normally, a speaker works by vibrating a membrane to manipulate air and create sound waves.
  • The mountable paper-thin speakers can produce sound from any surface with minimal distortion and might even be capable of drawing in Active Noise Cancellation.
  • The hand-sized loudspeaker which weighs a coin can generate high-quality sound.

   Facts to know:

  • Massachusetts Institute of Technology was located in the USA.
  • The first electric loudspeaker was patented by Alexander Graham Bell in 1876.
  • Loudspeaker is a device that changes electrical signals into sounds loud enough to be heard at a distance.
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