3D Printed Interactive Speakers

Yoshio Ishiguro (Disney Research Pittsburgh)
Ivan Poupyrev (Disney Research Pittsburgh)

We propose technology for designing and manufacturing interactive 3D printed speakers. With the proposed technology, sound reproduction can easily be integrated into various objects at the design stage and little assembly is required. The speaker can take the shape of anything from an abstract spiral to a rubber duck, opening new opportunities in product design. Furthermore, both audible sound and inaudible ultrasound can be produced with the same design, allowing for identifying and tracking 3D printed objects in space using common integrated microphones. The design of 3D printed speakers is based on electrostatic loudspeaker technology first explored in the early 1930s but not broadly applied until now. These speakers are simpler than common electromagnetic speakers, while allowing for sound reproduction at 60 dB levels with arbitrary directivity ranging from focused to omnidirectional. Our research of 3D printed speakers contributes to the growing body of work exploring functional 3D printing in interactive applications.

[Press Release]

Project_3DPrintedInteractiveSpeaker_ACMCHI2014_thumbnail3D Printed Interactive Speakers
Yoshio Ishiguro (Disney Research Pittsburgh), Ivan Poupyrev (Disney Research Pittsburgh)
ACM Conference on Human Factors in Computing Systems (CHI), 2014
Paper [PDF, 2.3MB]

Technical Details

Project_3DPrintedSpeakers_CHI14_TechDetails
The design of 3D printed free-form speakers based on electrostatic sound reproduction principles (ESR). The basic principles of electrostatic sound reproduction are simple and were explored in depth in the 1930s. A thin conductive diaphragm and an electrode plate are separated by insulating material, e.g., air, with the dielectric permittivity ε.

The audio signal is amplified to ~1000 V and applied to the electrode, charging it relative to the ground level that is connected to the diaphragm. As the electrode is charging, an electrostatic attraction force is developed be- tween the electrode and diaphragm. In the ESR speakers reported here we connect the ground to the diaphragm and the audio signal to the electrode (Figure b right). This is contrary to the ESR speaker design pro- posed previously, where the signal was connected to the diaphragm or a two-electrode configuration was used (Figure b left and middle). In designing home audio speakers the choice is irrelevant. However, it becomes important in 3D printed speakers embedded in toys and objects that can be touched by the user. The grounded diaphragm protects the user touching the speaker from the high-voltage audio source, making it safe to handle and manipulate the object with embedded speakers. This becomes particularly important in the interactive applications.

Contact

Email: dr-press [at] disneyresearch [dot] com —and— yoshio.ishiguro [at] disneyresearch [dot] com

Gallery

Project_3DPrintedSpeakers_CHI14_3DBearFront

3D Interactive Speaker

Project_3DPrintedSpeakers_CHI14_Figure4-Assembled-Speaker_logo

Thin film diaphragm fabrication. In order to create thin, reliable, full-body object compliant diaphragms we developed a new fabrication procedure that uses film coatings and molds to create diaphragms.

Project_3DPrintedSpeakers_CHI14_SlitPrintedSpeaker

The arbitrary shaped speakers reproduce sound around 60 dB levels with arbitrary directivity ranging from focused to omnidirectional.

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Spiral Speaker: The 3D printed diaphragm is shown on the left and an assembled speaker is shown on the right. The diaphragm is attached on the speaker body using a soft silicon compound.

Project_3DPrintedSpeakers_CHI14_MultiElectrode

Multi-electrode 3D printed speakers 3D printed speakers can be designed with any electrode configuration and number of electrodes. In the case of electrode arrays, each electrode acts as an independent 3D printed speaker, even though all of them share a single diaphragm.

Project_3DPrintedSpeakers_CHI14_3DduckSide

Duck Speaker where the entire 3D printed duck toy is wrapped in a compliant diaphragm, creating one single sound-emitting surface.

Project_3DPrintedSpeakers_CHI14_Comp-Bear

The 3D printed bear toy is used to implement and evaluate ultrasonic distance tracking.

Project_3DPrintedSpeakers_CHI14_Comp-Bear2

Embedded microphone detects the beacon signal and calculates distance from PC to the speaker.

Project_3DPrintedSpeakers_CHI14_Monitor-Bear

The ultrasound ID signal using Frequency Shift Keying (FSK).

Project_3DPrintedSpeakers_CHI14_Monitor-Duck

Microphone detects the ID signals

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