Epson Micro Flying Robot

Lore & Background

The Micro Flying Robot (μFR) was developed by Epson and first demonstrated at the International Robot Exhibition in Tokyo in November 2003. Its purpose was to demonstrate Epson’s micro-mechatronics technology and to explore the possible use of micro robots and the development of component technology applications. The μFR is levitated by contra-rotating propellers powered by four 7x2x1-mm ultrasonic motors originally developed for wristwatches. It is balanced in mid-air by a stabilizing mechanism that uses a linear actuator. Although radio-controlled, the μFR relies on power from an external battery via a power cable, which limits its flying range. The robot includes two microprocessors, a Bluetooth module, a gyro-sensor, an accelerometer, and an image sensor.

An enhanced version, the μFR-II, was developed in 2004 for full wireless operation paired with independent flight capability. The main challenge was combining lighter weight with greater dynamic lift. Epson made the robot lighter by developing a new gyro-sensor that is one-fifth the weight of its predecessor. Dynamic lift was boosted 30% by introducing more powerful ultra-thin ultrasonic motors and newly designed, optimally shaped main rotors. The μFR-II includes two 32-bit RISC microcontrollers, an on-board lithium polymer battery, and an image sensor that can capture and transmit images via Bluetooth wireless connection. Its flight time is 3 minutes.

Reader's Guide

The Epson Micro Flying Robot represents a significant milestone in micro-robotics and model aircraft technology. As the world’s smallest and lightest robot helicopter prototype at its debut, it demonstrated the feasibility of miniaturizing complex flight systems using components originally developed for other applications, such as ultrasonic motors from wristwatches. The μFR’s development was driven by a desire to showcase micro-mechatronics and explore potential uses for micro robots, including security and surveillance, disaster rescue, and space exploration. The subsequent μFR-II addressed the critical limitation of tethered power by achieving full wireless operation with an on-board lithium polymer battery, though flight time remained brief at 3 minutes. The progression from the μFR to the μFR-II illustrates the engineering challenges of balancing weight reduction with increased lift, solved through innovations like a lighter gyro-sensor and more efficient rotors. These prototypes laid groundwork for future micro aerial vehicles, particularly in contexts where small size and remote operation are essential. The inclusion of Bluetooth communication and image sensors in the μFR-II hinted at practical applications in remote sensing and data transmission. While neither version entered mass production, the μFR series remains a reference point in the history of miniature rotorcraft and the ongoing pursuit of autonomous micro flying robots.

Did You Know?

• The μFR uses four ultrasonic motors originally developed for wristwatches.
• The μFR-II achieved a 30% boost in dynamic lift through more powerful motors and redesigned rotors.
• The μFR-II’s gyro-sensor weighs one-fifth of its predecessor’s.
• The μFR-II has a flight time of just 3 minutes.