NAKA & CO.,LTD. is a company to design, to manufacture and supply crystal oscillators.

Crystal oscillator is consisted of Quartz Crystal and electronic circuits combination.
SPXO : Simple packaged crystal oscillators
VCXO : Voltage controlled crystal oscillators
TCXO : Temperature compensated crystal oscillators

Quartz crystal unit is consisted of crystal itself and metallic electrode.Continuous resonation could be launched with oscillating circuit.