Koga Issaku

Koga Issaku ( Japanese 古 賀 逸 策 , abroad also Issac Koga ; born December 5, 1899 in Tosu ( Saga Prefecture ); died September 2, 1982 ) was a Japanese electrical engineer.

Live and act

Koga Issaku graduated from Tōkyō University in 1923 . When the Tōkyō Kōgyō Daigaku was re-established in 1929 , he became assistant professor there and in 1939 professor. As wireless telecommunications developed rapidly and the demand for a stable vibration generator increased, Koge began studying quartz crystals.

In 1932 Koga published his studies on the stability of quartz-based high-frequency regulators. He had found out that with the so-called R1 cut of the quartz, the temperature dependence of the frequency is almost zero and that a significantly improved product for stabilizing high-frequency systems and also for other applications such as quartz watches is possible. In 1937, Koga built a quartz-controlled clock for the Tōkyō observatory. To date, the R1 cut is used almost exclusively.

In 1944, Koga also took over a professorship at the University of Tōkyō and was dean of the Faculty of Engineering there in 1958. He was adopted by both universities as "Meiyo Kyōju".

In 1948 Koga became a member of the Academy of Sciences . In 1963 he was honored as a person with special cultural merits and was awarded the Order of Culture in the same year .

After his death, the Union Radio-Scientifique Internationale (URSI) donated the “Koga Isaac Medal” for young scientists. In 1984 Motoichi Ohtsu was awarded the medal.

Individual evidence

1. ↑ http://www.ursi.org/awards.php#tab-award4 .

Remarks

1. ↑ Meiyo Kyōju (名誉 教授) is occasionally rendered in German as "Professor emeritus". But in contrast to this title, which is automatically used on retirement, this is a special award only occasionally granted in Japan.

literature

• S. Noma (Ed.): Koga Issaku . In: Japan. An Illustrated Encyclopedia. Kodansha, 1993. ISBN 4-06-205938-X , p. 808.

Web links

• Biographies Koga Issaku in the Kotobank, Japanese

Japanese name: As is common in Japan, the family name comes before the first name in this article . Thus, Koga is the family name, Issaku the first name.