Spring Drive
On 7 October 2005, Seiko announced the launch of the Seiko Spring Drive, a new movement that provides 72 hours of power compared to 40 hours for mechanical and 3 years for battery powered quartz watches. This new movement uses a "Tri-synchro Regulator". The power from the spring is used to turn the gear train and a generator. The generator powers a circuit that includes a low consumption (~25 nanowatts) quartz crystal oscillator. The oscillator is a part of a continuous feedback circuit, which holds the speed of the generator close to eight revolutions per second. According to Seiko records the resulting movement delivers accuracy commensurate with other quartz timed watch movements. The Spring Drive movement was also used as the basis for the first ever watch designed to be worn by an astronaut during a space walk, the aptly named Seiko Spring Drive Spacewalk.
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