Apparatus and method for controlling a laser diode to generate a linear illuminative output

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	Apparatus and method for controlling a laser diode to generate a linear illuminative output
其他题名	Apparatus and method for controlling a laser diode to generate a linear illuminative output
	DAVIS, JAMES, GLENN; HARDY, JAMES, ALAN
	1990-10-31
专利权人	EASTMAN KODAK COMPANY
公开日期	1990-10-31
授权国家	欧洲专利局
专利类型	发明申请
摘要	A controller for a laser diode causes the diode to generate an illuminative output which varies linearly in response to changes in image signals which range between minimum and maximum brightness levels. A switchover point between first and second modes of operation is selected to be above the knee region of the laser diode operating curve. If the input signal values are above the switchover point, diode illuminative ouptut is a function of these signal values. However, if the input signal values are below the switchover point, then the input signals are modulated to switch the diode several times between an ''on'' state which is above the knee region and an ''off'' state, to form one picture element (pixel). In order to vary the illuminative output as a linear function of the change in image signal level, the diode ''on'' time during formation of one pixel is a function of the image signal value.
其他摘要	用于激光二极管的控制器使二极管产生照明输出，该照明输出响应于图像信号的变化而线性变化，该变化范围在最小和最大亮度水平之间。选择第一和第二操作模式之间的转换点以在激光二极管操作曲线的拐点区域之上。如果输入信号值高于切换点，则二极管照明输出是这些信号值的函数。然而，如果输入信号值低于切换点，则输入信号被调制以在处于膝盖区域之上的“开启”状态和“关闭”状态之间多次切换二极管，以形成一个像素（像素）。为了将照明输出改变为图像信号电平变化的线性函数，在形成一个像素期间二极管“接通”时间是图像信号值的函数。
主权项	A controller for light emitting means having a characteristic operating curve which represents illuminative output as a function of input signal levels, with the curve including a nonlinear region, a linear region, and a knee joining the linear and nonlinear regions, the controller including: a. receiver means for receiving input signals having first levels which are in the linear region and second levels which are in the nonlinear region, the input signal levels varying as a function of the brightness of the image; b. means for receiving the input signals having levels which are in the linear region, and for generating first output signals which cause the light emitting means to generate an illuminative output which changes as a linear function of changes in the input signal levels which are in the linear region; and c. means for receiving the input signals having levels which are in the nonlinear region and for generating second output signals which cause the light emitting means to generate an illuminative output which changes as a linear function of changes in the input signal levels which are in the nonlinear region, the levels of the second output signals changing so as to cause the light emitting means to alternate between an on state and an off state in a manner that an average illuminative output is generated, with the time in which the light emitting means is in the on and off states being a function of the input signal levels.
申请日期	1988-12-27
专利号	EP0394338A1
专利状态	失效
申请号	EP1989901221
公开（公告）号	EP0394338A1
IPC 分类号	B41J2/52 \| B41J2/44 \| G03G15/04 \| H01S3/10 \| H01S5/06 \| H01S5/062 \| H04N1/00 \| H04N1/113 \| H04N1/23 \| H01S5/0683
专利代理人	-
代理机构	SCHMIDT, PETER, DIPL.-ING., ET AL
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/59606
专题	半导体激光器专利数据库
作者单位	EASTMAN KODAK COMPANY
推荐引用方式 GB/T 7714	DAVIS, JAMES, GLENN,HARDY, JAMES, ALAN. Apparatus and method for controlling a laser diode to generate a linear illuminative output. EP0394338A1[P]. 1990-10-31.