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Position detection apparatus, lens apparatus, image pickup system, and machine tool apparatus | Positionsmess-, Linsenvorrichtung, Bildaufnahmesystem und Maschinenwerkzeugapparat | Appareil de détection de position, appareil de lentille, système de prise d'image, et dispositif de machine-outil

Patentnummer:EP2778623B1
IPC Hauptklasse:G01D0005244
Anmelder:
Erfinder:Nakamura, Hitoshi (0)
c/o CANON KABUSHIKI KAISHA; 30-2, Shimomaruko 3-chome, Ohta-ku, , Tokyo 146-8501, JP
Anmeldung:14.03.14
Offenlegung:15.03.13
Patenterteilung:27.02.19

Abstract / Hauptanspruch
A position detection apparatus (100) includes a scale (10) including a pattern circumferentially and periodically formed on a circle whose center is a predetermined point, a sensor unit (20) relatively movable with respect to the scale (10), and a signal processor (40) which processes an output signal of the sensor unit (20) to obtain position information of an object, and the sensor unit (20) includes a first detector (21) and a second detector (22), and the signal processor (40) reduces an error component contained in the position information due to a difference between a rotation center of the scale (10) and the predetermined point based on a first detection signal outputted from the first detector (21) and on a second detection signal outputted from the second detector (22).

EP2778623B1


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