1972

• Founded on 1st May
• Development of BCI3 silicon wafer process for battery
• Release of silicon photovoltaic cells
• Release of planar type photocell
• Release of a three-hole tape reader, IBM card, UNIVAC card, and a light receiving element for mark
• Planar type photovoltaic cells are used for smoke detectors of fire alarm

1973

• Established as a shareholder company organization on 15th June
• Incorporated as KODENSHI CORP.
• With 3 million capital
• President and Representative Director: NAKAJIMA KAZUHIRO
• Release of high-performance photodiode

1974

• Capital increased to 6 million yen in May
• Release of industrial silicon photoelectric conversion devices (solar cells)

1975

• Tokyo branch opened in September
• Release of a three-hole tape photoelectric read head

1976

• Korea office opened in October
• Development of visible light-emitting diodes (lamps, numeric display elements)

1977

• Capital increase to 12 million yen in April
• Release of remote control light-receiving element for TV
• Release of 2-chip phototransistor, Photo Darlington

1978

• Capital increase to 24 million yen in April
• Monthly production of solar cell for watch is 400,000pcs
• The first exhibition as an optical semiconductor specialty at the Japan Electronics Show
• 1000 pre-sold watches with solar power

1979

• Release of solar cell for power
• Release of solar cell for calculator
• Silicon wafer process line installed in headquarters factory
• Development of BBr3 diffusion process
• Release of blue cell
• Development of vertical wafer type phototransistor
• Release of single-chip phototransistor
• Development of GaAs infrared light-emitting diode