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VERLAGERUNGSDETEKTIONSVORRICHTUNG

Patentnummer:EP3663705B1
IPC Hauptklasse:G01B11/16
Anmelder:DMG MORI CO LTD (1)
DMG MORI SEIKI CO LTD (1)
Erfinder:MATSUSHITA KENJI (1)
NIIYA MASAYUKI (1)
NISHIDA TERUKAZU (1)
SHINTANI MASAYUKI (1)
SUZUKI AKINORI (1)
TAMIYA HIDEAKI (1)
TANIGUCHI KAYOKO (1)
Anmeldung:20.11.19
Patenterteilung:25.08.21
Einspruch bis:25.05.22

Abstract / Hauptanspruch
The purpose of the present invention is to provide a displacement detection device capable of stably and accurately detecting an amount of displacement. As a polarization maintaining fiber for transmitting light from a light source to a displacement detector, the polarization maintaining fiber having a length not to be equal to a length obtained by dividing, a product of an integral multiple of twice a length of a resonator times a refractive index of the resonator and a beat length obtained from a difference between propagation constants of two polarization modes, by a wavelength of the light source, is selected from a range including a length equal to the above length. The polarization maintaining fiber includes a plurality of polarization maintaining fibers fitted to each other by removable connectors, and when a plurality of fitting portions exists, in order of connection of the polarization maintaining fibers, a total length of the polarization maintaining fibers including a last polarization maintaining fiber and any combinations of other polarization maintaining fibers except the last polarization maintaining fiber is set not to be equal to a length obtained by dividing, a product of an integral multiple of twice the length of the resonator times the refractive index of the resonator and a beat length obtained from a difference between propagation constants of X and Y polarization modes of the polarization maintaining fiber, by the wavelength of the light source.


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