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Off Topic Kinji Fujita solves the quartz miniaturization problem.
avatar September 07, 2019 06:44AM
Japanology - watches

[www.hodinkee.com]

Hodinkee report on Citizen 0100

[youtu.be]

Kinji Fujita saw a tuning fork and realized that this was how to miniaturize a quartz crystal for watches.

I never thought about it, and assumed that the quartz oscillated in a solid chunk, but now it appears that the quartz crystal in a watch actually operates as a tuning fork, which is a little different. Prior to the tuning fork design, battery consumption was too high, unless you wanted to change the battery after three days.

Quartz has a fair number of free electrons in it. That is how you can slam it and with the aid of a coil, make an electronic lighter. Other than giving up electrons when it is deformed, quartz will go the reverse and bend when a voltage is applied.

So by making the crystal into the shape of a tuning fork, the battery is bending the forks at a high oscillating rate, 32.768 kHz.

Early quartz watches were regulated with a variable capacitor. Nowadays Phillips and others make watch chips with a correction register that allows pulses to be skipped.
Works good and is impervious to mechanical failure. -kb.



Edited 5 time(s). Last edit at 09/07/2019 01:11PM by KentBetts.


Subject Author Views Posted
Off Topic Kinji Fujita solves the quartz miniaturization problem. Jpeg Attachments KentBetts 67 September 07, 2019 06:44AM
Those Japanese: know how to make things work and keep working! Thumbs Up (n/t) James T. KirkĀ© 30 September 08, 2019 04:41AM
Yep they sure do Thumbs Up (n/t) MarkKershaw 33 September 08, 2019 05:10AM
So how did the Astron work? Jpeg Attachments KentBetts 42 September 08, 2019 05:46AM
Re: So how did the Astron work? BF Hammer 40 September 08, 2019 09:06AM



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