Inventor
MATSUI KEIJI
JP12 patents
⚠️ This page may combine multiple inventors who share the name “MATSUI KEIJI”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
OKUMA MACHINERY WORKS LTD
11 patentsUS5801378ASep 1, 1998
Optical encoder diffraction gratings for eliminating diffracted light components
OKUMA MACHINERY WORKS LTD43 citations92
US5249032ASep 28, 1993
Optical position-detecting apparatus
OKUMA MACHINERY WORKS LTD28 citations92
US5068530ANov 26, 1991
Optical encoder
OKUMA MACHINERY WORKS LTD41 citations92
US4979827ADec 25, 1990
Optical linear encoder
OKUMA MACHINERY WORKS LTD36 citations92
US4956553ASep 11, 1990
Optical encoder with varying grating pitch
OKUMA MACHINERY WORKS LTD25 citations92
US5260769ANov 9, 1993
Position detector
OKUMA MACHINERY WORKS LTD17 citations73
US5182613AJan 26, 1993
Position detecting apparatus generating periodic detection signals having equal third and fifth harmonic components
OKUMA MACHINERY WORKS LTD17 citations73
US5170221ADec 8, 1992
Parallel light ray measuring apparatus
OKUMA MACHINERY WORKS LTD12 citations73
US5066129ANov 19, 1991
Optical linear encoder with light quantity calabration
OKUMA MACHINERY WORKS LTD13 citations73
US4950891AAug 21, 1990
High resolution optical encoder having a long detection stroke
OKUMA MACHINERY WORKS LTD7 citations73
US4983900AJan 8, 1991
Linear encoder with plural detectors for use with one or more main scales
OKUMA MACHINERY WORKS LTD16 citations69