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seiko_38

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seiko_38 [06.12.2021 17:17]
gerdlothar [History]
seiko_38 [06.12.2021 17:20] (current)
gerdlothar
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 ===== History ===== ===== History =====
-[[Seiko]] was quietly racing to develop a [[quartz watch]] movement in the 1960s, and delivered their first [[Seiko 35|Cal. 35]] movement to the [[Neuchatel Observatory]] in late [[1967]], just a few months after the [[CEH]] delivered their [[Beta 21|"Beta" quartz movement prototypes]]. A product of [[Suwa Seikosha]] Cal. 35 used a 8,192 Hz of 16,384 Hz quartz crystal and an [[integrated circuit]] from [[Intersil]] in the USA. Seiko offered Cal. 35 SQ for sale in the [[Seiko Astron]] watch on Christmas Day, [[1969]], with 100 examples sold in the first month. Suwa rival [[Daini Seikosha]] developed [[Cal. 36]] and launched it in [[1970]], but neither movement was truly produced in volume.+[[Seiko]] was quietly racing to develop a [[quartz watch]] movement in the 1960s, and delivered their first [[Seiko 35|Cal. 35]] movement to the [[Neuchatel Observatory]] in late [[1967]], just a few months after the [[CEH]] delivered their [[Beta 21|"Beta" quartz movement prototypes]]. A product of [[Suwa Seikosha]] Cal. 35 used a 8,192 Hz of 16,384 Hz quartz crystal and an [[integrated circuit]] from [[Intersil]] in the USA. Seiko offered Cal. 35 SQ for sale in the [[Seiko Astron]] watch on Christmas Day, [[1969]], with 100 examples sold in the first month. Suwa rival [[Daini Seikosha]] developed [[Seiko 36|Cal. 36]] and launched it in [[1970]], but neither movement was truly produced in volume.
  
 Suwa Seikosha developed Cal. 38 as a full-production midrange to high-end quartz movement, and it incorporates many features that now seem commonplace but were groundbreaking at the time. The quartz crystal oscillated at 16,384 Hz and it used a [[CMOS]] [[integrated circuit]] to reduce battery consumption, though later examples used a 32 KHz crystal. The hands were operated by a [[stepper motor]] and a jeweled backlash pin ensured a smooth [[dead beat]] seconds hand. The earliest examples were sold as "VFA" ("Very Fine Adjustment") and were adjusted for temperature and in 6 positions. Suwa Seikosha developed Cal. 38 as a full-production midrange to high-end quartz movement, and it incorporates many features that now seem commonplace but were groundbreaking at the time. The quartz crystal oscillated at 16,384 Hz and it used a [[CMOS]] [[integrated circuit]] to reduce battery consumption, though later examples used a 32 KHz crystal. The hands were operated by a [[stepper motor]] and a jeweled backlash pin ensured a smooth [[dead beat]] seconds hand. The earliest examples were sold as "VFA" ("Very Fine Adjustment") and were adjusted for temperature and in 6 positions.
seiko_38.txt · Last modified: 06.12.2021 17:20 by gerdlothar

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