Invention Grant
US08189182B2 Semiconductor integrated circuit device, optical scanner using same, image forming apparatus using optical scanner, and return light identification method
有权
半导体集成电路器件，使用其的光学扫描器，使用光学扫描器的成像设备和返回光识别方法
- Patent Title: Semiconductor integrated circuit device, optical scanner using same, image forming apparatus using optical scanner, and return light identification method
- Patent Title (中): 半导体集成电路器件，使用其的光学扫描器，使用光学扫描器的成像设备和返回光识别方法
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Application No.: US12535815Application Date: 2009-08-05
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Publication No.: US08189182B2Publication Date: 2012-05-29
- Inventor: Mitsutaka Iwasaki
- Applicant: Mitsutaka Iwasaki
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Cooper & Dunham LLP
- Priority: JP2008-205927 20080808
- Main IPC: G01J1/12
- IPC: G01J1/12
Abstract:
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.
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