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	Image forming device
	IMAGAWA SUSUMU; TAKEYAMA YOSHINOBU; EMA HIDETOSHI; HATTORI HITOSHI; ISHIDA MASAAKI
	1992-08-19
著作权人	RICOH CO LTD
专利号	JP1992230778A
国家	日本
文献子类	发明申请
其他题名	Image forming device
英文摘要	PURPOSE:To obtain a high definition image by not making modulation pulse duty of recording light 100% in the image forming device carrying out recording by varying exposed light quantity according to image information. CONSTITUTION:The modulation pulse duty of the recording light is not made to be 100%. Comparison of light receiving signal in ratio to photoelectromotive current induced by a light receiving element 4 and a command signal of light emitting level is carried out by a comparative amplifier 1, and forward current of a semiconductive body laser 3 is controlled to make the light receiving signal and a light emitting level command signal to be equivalent. Furthermore, a current which is set beforehand is outputted by a current converter 2 according to the light emitting level command signal so that the light receiving signal and the light emitting level command signal are equivalent. The sum of outputted current of this current converter 2 and control current outputted by the comparative amplifier 1 is made the forward current of the semiconductive body laser 3. Thus, a laser printer hardly receiving influence from variation in velocity of a photosensitive body or variation in laser scanning position and provided with satisfactory controlling precision of exposure energy can be obtained.
公开日期	1992-08-19
申请日期	1991-05-09
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/69142]
专题	半导体激光器专利数据库
作者单位	RICOH CO LTD
推荐引用方式 GB/T 7714	IMAGAWA SUSUMU,TAKEYAMA YOSHINOBU,EMA HIDETOSHI,et al. Image forming device. JP1992230778A. 1992-08-19.

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