公开(公告)号：JP2000028481A

公开(公告)日：2000-01-28

申请号：JP12681999

申请日：1999-05-07

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ALOISIO JR CHARLES J ,  BREWER TRACY E ,  PENN LEONARDO M ,  PENN THEATRICE S ,  SIDDIQUI SHAHABUDDIN

IPC: G02B6/00 ,  G01M11/00

Abstract: PROBLEM TO BE SOLVED: To obtain a method and an apparatus in which the position and the size of an ink skip can be detected precisely by a method wherein a photodetector which receives light reflected from the outer surface is provided and a signal processing device which decides whether the photodetector detects a plurality of surface characteristics is provided. SOLUTION: In an apparatus, a light source, a lens system, a photodetector array 9, an amplifier 10, an analog-to-digital converter(ADC) 11, a computer 12 and a voice or vision indicator 13 are provided. The ACD 11 and the computer 12 constitute a processing device which processes a detection signal. The computer 12 generates a reference voltage on the basis of an optical fiber region in which a defect in an ink does not exist. A plurality of samples are obtained by the ADC 11, and their read-out values are averaged so as to be stored in a memory. On the basis of whether a digital signal received by the computer 12 from the ADC 11 is by a decided amount larger or smaller than the reference voltage, it is decided that a surface characteristic such as an ink skip is detected.