4. Growing Period (1983-1987)
The spread of microwave ovens had begun in Europe and Korea in addition
to USA and Japan where microwave ovens were popular.
According to the expansion of the market three Korean manufactures entered
into the production of a magnetron and a microwave oven.
Therefore competition among magnetron manufactures became keener, then
cost down and development of a magnetron had been accelerated.
In 1988 the regulation for noise at 12GHz band became severer due to start
of satellite broadcasting.
This frequency band is corresponding to 5th harmonics of oscillating frequency
on a magnetron.
In order to suppress harmonics radiation Toshiba developed 2M240 with coaxial
type of the choke on the antenna, which is now the world standard as for
the antenna structure.
5. Growing and Maturity Period (1990- )
Toshiba Corporation transferred the magnetron production in 1990 and all
magnetron business in 1992 to Toshiba Hokuto Electronics.
In 2000 we transferred the magnetron production to Toshiba Display Device
Thailand which is the former company of Toshiba Hokuto Devices Thailand.
After business transfer to our company from Toshiba Corporation, we developed
2M282 of high efficiency magnetron in 2000, and 2M253-Z of noise improved
type in 2001. Corresponding to requirement from customers and revised legal
regulation we have been developing new magnetrons.
