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1. (WO2018062169) LENGTH MEASUREMENT DEVICE

Pub. No.:    WO/2018/062169    International Application No.:    PCT/JP2017/034720
Publication Date: Fri Apr 06 01:59:59 CEST 2018 International Filing Date: Wed Sep 27 01:59:59 CEST 2017
IPC: G01B 11/02
Applicants: NIDEC-READ CORPORATION
日本電産リード株式会社
Inventors: KUSUDA Tatsufumi
楠田 達文
Title: LENGTH MEASUREMENT DEVICE
Abstract:
A length measurement device is provided with: a placement table 2; cameras 31–34 for imaging images of imaging ranges 41–44 including target points P1–P4; first marks 51–54 within the imaging ranges 41–44; a reference position storage unit 19 for storing the positions of the first marks 51–54 on a placement surface 20 beforehand as first mark reference positions; an image position acquisition unit 11 for acquiring, on the basis of the imaged images of the cameras 31–34, the target image positions of the target points P1–P4 in the imaged images and the first mark image positions of the first marks 51–54 in the imaged images; a target position acquisition unit 14 for determining the positions of the target points on the placement surface 20 on the basis of the target image positions and first mark image positions in the imaged images and the first mark reference positions on the placement surface 20; and a length acquisition unit 15 for determining, on the basis of the positions of the target points, the length of a portion to have the length thereof measured.