-
公开(公告)号：DE2262855A1
公开(公告)日：1973-07-12
申请号：DE2262855
申请日：1972-12-22
Applicant: IBM
Inventor： BJERKE BRIAN KENNETH , SIVERLING MICHAEL MCHUGH
Abstract: An illumination provides incident radiation to a document lying in an object plane. A photodetector converts nonspecular reflections from the plane into an electrical signal. To prevent unwanted specular reflections, from plastic mail-piece windows or uneven documents, for degrading the signal-to-noise ratio, an optical diffuser is located adjacent the object plane. Both the incident and the reflected radiation pass through the diffuser, which may be a ground-glass flat.
Search Results
1
records
(took 0.042 seconds)
筛选
AND
AND
过滤
NOT
NOT
Scan to Join
