发明名称 |
Synchronizing signal generating system for laser scanner |
摘要 |
A synchronizing signal generating system for a laser scanner includes a source for emitting a first laser beam for scanning and a second laser beam for synchronization of scans by the first laser beam, a polygonal mirror for causing the first laser beam to scan a medium and for causing the second laser beam to scan a grating which has bright portions and dark portions alternately arranged along a scanning direction of the second laser beam, a converging optical system for converging the second laser beam transmitted through the grating, a light receiving system for receiving the second laser beam converged by the converting optical system and for generating a synchronizing signal and a circuit for controlling the source responsive to the synchronizing signal so as to synchronize a scan timing of the first laser beam. A scan length of the second laser beam measured on the grating is set longer than a scan length of the first laser beam measured on the same plane.
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申请公布号 |
US4962431(A) |
申请公布日期 |
1990.10.09 |
申请号 |
US19890311778 |
申请日期 |
1989.02.17 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
IMAKAWA, SUSUMU;TAKEYAMA, YOSHINOBU;KUBO, NOBUAKI;SAITOH, MASANORI |
分类号 |
G06K15/12;H04N1/053;H04N1/113;H04N1/12 |
主分类号 |
G06K15/12 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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