Nihon Dempa Kogyo
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Using its synthetic quartz crystals, NDK produces crystal-related products such as crystal devices (e.g. crystal units, crystal oscillators, crystal filters) and ultrasonic transducers for medical use. In recent years, the company has begun to develop frequency synthesizers and low-power wireless modules.
In 2010, a NDK facility was heavily damaged by an autoclave explosion, killing one person and injuring two others.
- 1948 : NDK was established.
- 1950 : Started crystal unit production and sales.
- 1958 : Succeeded in test production of synthetic quartz crystal.
- 1959 : Started crystal filter production.
- 1960 : Started crystal oscillator production.
- 1963 : Began trading of NDK stock on the OTC market.
- 1979 : Developed and industrialized surface acoustic wave (SAW) filter.
- 1990 : Listed NDK stock on Second Section of the Tokyo Stock Exchange.
- 1998 : Listed on the First Section of the Tokyo Stock Exchange.
- Crystal Units
- Crystal Oscillators
- Crystal Filters
- Surface Acoustic Wave (SAW) Devices
- Optical Components
- Synthetic Quartz Crystals
- Ultrasonic Transducers
- Frequency Synthesizers
NDK has sales offices in Japan, China, France, Germany, Italy, Malaysia, Singapore, United Kingdom, and United States. NDK has production and engineering facilities in Japan, China, Germany, Malaysia, and the United States.
NDK's Belvidere, IL facility was heavily damaged in 2009 when one of the crystal autoclaves ruptured violently, causing an explosion. A beam from the NDK building killed a man at a nearby gas station, and a shard of the ruptured autoclave's wall injured two others and caused heavy damage in a nearby office building. The rupture was in a crystal-growth autoclave that had undergone stress corrosion cracking and was inadequately inspected; recommendations from a previous incident were ignored. As a result, the autoclave became overstressed and failed completely.  Demolition of the facility began in March 2015.