Spring Drive is a name given to a series of watch movements produced by Epson in Shiojiri. The concept of using a mainspring to power a quartz timing package was first conceived in 1977 by Yoshikazu Akahane (赤羽 好和) at Suwa Seikosha[1] (now a part of Epson after a 1985 merger).[2] Specified to one second accuracy per day,[3] the movement uses a conventional gear train as in traditional mechanical watches, but rather than an escapement and balance wheel, instead features Seiko's Tri-synchro Regulator system in which power delivery to the watch hands is regulated based on a reference quartz signal.[3]
Commercially released in 1999,[2] the movement is found in watches distributed by the Seiko Watch Corporation, including its Credor, Grand Seiko, Presage, and Prospex brands.
- ^ "Time passes beautifully on elegant, high-quality watch". japantimes.co.jp. The Japan Times. 26 March 2018. Retrieved 11 April 2019.
- ^ a b "Seiko/Credor Spring Drive", Milestone Products, Seiko Epson
- ^ a b "spring drive movement about". grand-seiko.com. Grand Seiko. Retrieved 11 April 2019.