Chu 朱Genuine and possibly dumb question
Why do watch makers advertise "quartz"?
Is it the name of the movement or the actual mineral? Isn't it like one of the cheapest and most abundant minerals? Why is it worthy of advertising?
I never understood this.
D. G. Marshall@MelissaBearTrix might be able to answer this.
Melissa BearTrixInside the watch is a thin crystal of quartz, it vibrates around 32.3 somethings per second, and there is a chip that counts, and then sends a signal to the little motor to take a spin, well rotate
Hugz & xXx
sophie@MelissaBearTrix @davidtheeviloverlord @chu To add on to this, quartz has piezo electric qualities. If you strike it, it generates a charge, but if you run a charge through it it bends, completing a circuit. If you take particularly pure quartz, and shape it very precisely, you can make a highly accurate clock circuit, pretty much the most accurate you can get short of using atomic clocks. During WW2 quartz crystals were considered a military secret by the british, as they were used to tune their radios (for radar, etc). Early computers used them extensively, highest I ever saw was 33Mhz.
By writing "quartz" on the watch, they're advertising that it's pretty damn accurate. Compared to pre-quartz based time measurement.
I know modern devices use MEMS devices -- essentially a very tiny tuning fork made on a silicon chip -- for their low frequency clocks (ballpark of 15khz, the standby clock in a phone will use this), I'm not sure how the 100Mhz + signals are made
By writing "quartz" on the watch, they're advertising that it's pretty damn accurate. Compared to pre-quartz based time measurement.
I know modern devices use MEMS devices -- essentially a very tiny tuning fork made on a silicon chip -- for their low frequency clocks (ballpark of 15khz, the standby clock in a phone will use this), I'm not sure how the 100Mhz + signals are made
Malin Dixon@sophie @chu @davidtheeviloverlord @MelissaBearTrix
The quartz crystals that run at 32768 Hz are also in the shape of a tuning fork.
All quartz crystals are mechanical resonators. The piezo-electric effect is very convenient for driving them and getting an electrical signals from them, but it has next to no effect on the frequency. To make a bit of quartz resonate at 32768 the tuning fork is used. Crystals in the MHz range use a different mechanical resonance, called thickness-shear mode.
The quartz crystals that run at 32768 Hz are also in the shape of a tuning fork.
All quartz crystals are mechanical resonators. The piezo-electric effect is very convenient for driving them and getting an electrical signals from them, but it has next to no effect on the frequency. To make a bit of quartz resonate at 32768 the tuning fork is used. Crystals in the MHz range use a different mechanical resonance, called thickness-shear mode.
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