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	Optical modulation in optical recording accompanied by wavelength conversion
	OKAZAKI YOJI; KAMIYAMA KOJI
	1990-04-24
著作权人	FUJI PHOTO FILM CO LTD
专利号	JP1990111568A
国家	日本
文献子类	发明申请
其他题名	Optical modulation in optical recording accompanied by wavelength conversion
英文摘要	PURPOSE:To enable a high gradation image to be recorded at high speed by a method wherein a minimum drive current is established at a value slightly larger than threshold current, and a semiconductor laser beam is directly modulated. CONSTITUTION:For a light emission level command signal Vref by a table 12 and D/A converter 13, one among values of dividing a space between a minimum value Vref1 and a maximum value Vref2 at an equal interval is so set as to be taken according to an image signal S Then, the minimum value Vref1, i.e., a value for giving minimum drive current Imin to a semiconductor laser 17 is so established that a value slightly larger than threshold current Ith is taken as the minimum drive current Imin. Therefore, even though natural emission light is included in a light beam 18 incident to an optical wavelength conversion element 30, since a wavelength of the light beam 18 is not converted and is cut with a filter 24, intensity of a light beam 18'' emitted from the light wavelength conversion element 30 basically corresponds to only intensity of a laser beam emitted from the semiconductor laser 17.
公开日期	1990-04-24
申请日期	1988-10-20
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/59588]
专题	半导体激光器专利数据库
作者单位	FUJI PHOTO FILM CO LTD
推荐引用方式 GB/T 7714	OKAZAKI YOJI,KAMIYAMA KOJI. Optical modulation in optical recording accompanied by wavelength conversion. JP1990111568A. 1990-04-24.

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