camaro Skrev:Accu-quartz og Beta21 har ikke noget med stemmegaffel at gøre.

Citat:The movement looks like an advanced and complex prototype and consists of three separate modules that were produced by CEH (circuitry), Ebauches (movement), Omega (motor).
Once a battery is inserted it activates a quartz crystal resonating at a frequency of 8192Hz which is divided by the electronic circuit into smaller impulses.
There were no micro stepping motors available at that time so the B21 was based on the Accutron idea.
Instead of a tuning fork there is a resonating rod with permanent magnet on one end and an adjustable counter weight on the opposite end.
The resonator with jeweled index finger is put into vibration by the motor module - an electromagnetic coil controlled by impulses from the electronic module.
The vibrating index finger provides motion to the index wheel so the concept is nearly identical with the Accutron except that a quartz and chip have been added on top as frequency precision instruments.

camaro Skrev:Hej Geodoc.
Ikke noget at undskylde, jeg synes din gennemgang var højst interessant

camaro Skrev:Quartz er quartz (frit efter Storm P) og jeg har aldrig set et stemmegaffel-ur med ordet quartz på skiven.

Citat:Possibly the only example of this type of watch is the Bulova Accuquartz (Calibre 224x). They are superficially very similar to the standard 218 Accutrons:
.... they still have a tuning fork, the two coils, similar looking indexing system but the basics electronics (transistor, resistors, etc) have been replaced with a quartz crystal and associated circuitry.

In previous calibres, the tuning fork was responsible for the accuracy of the watch and tuning regulators were supplied on the coil cups to make small adjustments to the tuning fork frequency.
In the 224x calibres, the tuning forks have become "passive" and the quartz crystal controls the tuning fork frequency
--- the regulation of the movement is now undertaken by "switching in" or "switching out" a series of internal capacitors by using small brass screws.
You can see these 6 screw holes on the far left of the 2242 movement below.

khbk Skrev:Det går uhyre nøjagtigt, men kræver nyt batteri en gang om året - lidt afhængig af hvor ofte man ser på uret.
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Kristen

khbk Skrev:Det er da godt, at der er nogen, der lægger mærke til, hvad man skriver! <!-- s:lol: --><img src="{SMILIES_PATH}/icon_lol.gif" alt=":lol:" title="Laughing" /><!-- s:lol: -->
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Kristen

khbk Skrev:Sådan kan forsiden af et stemmegaffel-quartz-ur se ud.
.... Det er mit Bulova, produceret i 1974 og købt nyt af min far hos Ragnar i Odense i 1976.
Det går uhyre nøjagtigt, men kræver nyt batteri en gang om året - lidt afhængig af hvor ofte man ser på uret.
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Kristen