EP 0432289 B1 19930908 - OPTICAL SENSOR FOR REFLECTIVE AND NON-REFLECTIVE MATERIALS
Title (en)
OPTICAL SENSOR FOR REFLECTIVE AND NON-REFLECTIVE MATERIALS
Publication
Application
Priority
EP 89122834 A 19891211
Abstract (en)
[origin: EP0432289A1] In order to scan materials of different reflectance behaviour, such as recording carriers (M) in printing equipment, a reflection light barrier (RL) is provided which scans the side perforations of the recording carrier (M). The reflection light barrier (RL) is arranged at a reference distance (RA) from a reflecting surface (RF) there being located between the reflecting surface (RF) and the reflection light barrier (RL) an optically transparent guide channel (PK) for guiding the material to be scanned. Coupled to the reflection light barrier is an electrical evaluation arrangement with a microprocessor controller (10), which compares the reference signal (VR) obtained by reflection of the light at the reflecting surface (RL) at the reference distance (RA) with a material signal (VM) obtained during scanning of the material, and generates a scanning signal (A3) as a function thereof. When the paper is inserted, the exciting current of the luminous element (LED) is compensated in the reflection light barrier (RL) during a paper insertion cycle (PE). This produces an adjustment to the reflectance behaviour of the recording carrier employed, and an adjustment to the state of ageing of the reflection light barrier (RL). <IMAGE>
IPC 1-7
IPC 8 full level
B65H 7/14 (2006.01)
CPC (source: EP)
B65H 7/14 (2013.01); B65H 2511/514 (2013.01); B65H 2515/60 (2013.01); B65H 2553/414 (2013.01)
Designated contracting state (EPC)
DE ES FR GB IT NL
DOCDB simple family (publication)
EP 0432289 A1 19910619; EP 0432289 B1 19930908; DE 58905565 D1 19931014
DOCDB simple family (application)
EP 89122834 A 19891211; DE 58905565 T 19891211