Inventor
UMEMURA NAOMITSU
JP4 patents
Patents
4 patentsUS6580674B1Jun 17, 2003
Phase shifter and optical head device mounted with the same
ASAHI GLASS CO LTD60 citations94
US6917576B2Jul 12, 2005
Retarder and optical head device installing the same
ASAHI GLASS CO LTD8 citations72
US5142254AAug 25, 1992
Ultrasonic delay line device with an adjusting circuit for adjusting delay time, a comb-shaped filter using the ultrasonic delay line device and a method of adjusting delay time
ASAHI GLASS CO LTD1 citations50
US4733204AMar 22, 1988
Ultrasonic-wave delay element
ASAHI GLASS CO LTD0 citations31