发明名称 |
SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE, OPTICAL SCANNER USING SAME, IMAGE FORMING APPARATUS USING OPTICAL SCANNER, AND RETURN LIGHT IDENTIFICATION METHOD |
摘要 |
A semiconductor integrated circuit device controlling a first light amount of light emitted from a light source based on a second light amount of light entering a light amount detection part so that the first light amount becomes a target level is disclosed. The semiconductor integrated circuit device includes a comparison part configured to compare a voltage corresponding to the second light amount and a reference voltage corresponding to the target level; and a drive current control part configured to control a drive current supplied to the light source based on the result of the comparison by the comparison part. The drive current control part includes a return light identification part configured to determine whether the second light amount includes a third light amount of return light occurring discontinuously.
|
申请公布号 |
US2010033714(A1) |
申请公布日期 |
2010.02.11 |
申请号 |
US20090535815 |
申请日期 |
2009.08.05 |
申请人 |
RICOH COMPANY, LTD. |
发明人 |
IWASAKI MITSUTAKA |
分类号 |
G01J1/12;G01J1/32;G03G15/04 |
主分类号 |
G01J1/12 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|