Researchers have developed technology to produce compact, flexible rolls of paper speakers that can be used to create low-cost indoor infotainment systems.
A team from Chemnitz University of Technology has found a way to print solid rolls of loudspeakers that can be used to make ring-shaped speakers for surround sound. They originally developed separate sound-transmitting sheets with two layers of conductive organic polymer and a thin piezoelectric material sandwiched between them. These speakers are 90% paper.
The core vibrates with incoming electrical signals and air displacement generates clear and loud sound. Polymer sheets act as electrodes. Since the use of such a device was very limited, the team improved the printing technology..
By developing a method of in-line printing of paper loudspeaker baffles and applying an invisible protective laminate layer, the scientists were able to produce multi-segment speakers in roll form. They can not only be color-printed on both sides, but also be bent into rings to obtain surround sound..
During testing, the team manufactured a round, four-meter speaker with 56 individual T-Ring loudspeakers. With a mass of 150 g, the device included 7 segments and a printed circuit. Such systems can be used for advertising purposes or in public buildings, such as exhibitions, museums, as well as for homogeneous sound reinforcement over long stretches such as corridors..
We also previously reported on the development of a prototype smart window unit with built-in noise cancellation..
text: Ilya Bauer, photo: Chemnitz University of Technology
Scientists have come up with a way to print paper speakers for low-cost surround sound systems