Inventor
NISHIKAWA YUKIYASU
JP5 patents
⚠️ This page may combine multiple inventors who share the name “NISHIKAWA YUKIYASU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
ASAHI OPTICAL CO LTD
4 patentsUS4486080ADec 4, 1984
Device for detecting blinking of an eye under examination
ASAHI OPTICAL CO LTD13 citations71
US4432617AFeb 21, 1984
Eye refractive error measuring device
ASAHI OPTICAL CO LTD9 citations71
US4540253ASep 10, 1985
Method and device for measuring eye refraction errors
ASAHI OPTICAL CO LTD5 citations58
US4083055AApr 4, 1978
Exposure information quantizing circuit utilizing shift register
ASAHI OPTICAL CO LTD3 citations57