EP 0966651 A1 19991229 - NON-CONTACT POSITION SENSOR
Title (en)
NON-CONTACT POSITION SENSOR
Title (de)
KONTAKTLOSER POSITIONSSENSOR
Title (fr)
CAPTEUR DE POSITION SANS CONTACT
Publication
Application
Priority
US 9704227 W 19970314
Abstract (en)
[origin: WO9841814A1] A device for measuring the displacement of a movable object includes a stationary light source (10) that produces an incident light beam. A target feature (17), attached to, or integral with, the object, reflects the incident light beam and forms a first image of the light source in close proximity of the target feature. An imaging lens (26) receives the reflected light beam and reforms the first image of the light source as a second image on the photodetector (20). The photodetector, spaced from the object, receives the reflected light beam and produces an electric signal having a characteristic which is proportional to a received location on the photodetector of the second image and which represents a position of the object. The target feature includes a curved surface that reflects the light beam such that a small, point-like or line-like first image of the light source is formed and reformed as a second image on the photodetector.
IPC 1-7
IPC 8 full level
G01B 11/14 (2006.01); G01D 5/28 (2006.01); G11B 21/10 (2006.01)
CPC (source: EP KR)
G01B 11/14 (2013.01 - KR); G01D 5/28 (2013.01 - EP)
Designated contracting state (EPC)
DE GB
DOCDB simple family (publication)
WO 9841814 A1 19980924; EP 0966651 A1 19991229; EP 0966651 A4 20041006; JP 2002521003 A 20020709; JP 4020216 B2 20071212; KR 100498192 B1 20050701; KR 20000076209 A 20001226
DOCDB simple family (application)
US 9704227 W 19970314; EP 97916026 A 19970314; JP 52553798 A 19970314; KR 19997008303 A 19990913