Multi-beam scanning apparatus and multi-beam detection method for the same,申请号US19970901256-传众专利搜索

Multi-beam scanning apparatus and multi-beam detection method for the same

申请公布号：US5834766(A)

申请号：US19970901256

申请日期：1997.07.28

申请公布日期：1998.11.10

申请人：

RICOH COMPANY, LTD.

发明人：SUHARA, HIROYUKI

分类号：B41J2/47;G02B26/12;(IPC1-7):H01J3/14

主分类号：B41J2/47

摘要：A two-beam detection method causes two beams to differ in light intensity and converging the two beams to enter a common photosensitive element, a photoreception surface of the photosensitive element being configured such that the two beams differ in time required to pass the photoreception surface, processes an output from the photosensitive element using a plurality of threshold levels so as to obtain rectangular signals, one of the rectangular signals obtained using one of the plurality of threshold levels being designated as a detection signal for one of the two beams, and performs a predetermined calculation on the rectangular signals so as to obtain a detection signal for the other of the two beams.