专利名称：Optical focussing adjustment device发明人：François Le Carvennec申请号：US08/732341申请日：19961030公开号：US05864526A公开日：19990126
摘要：System for the adjustment of the focusing of a beam on a carrier (5). A firstdetector (CA) with a wide dynamic range of detection and with limited stability measuresthe light reflected by the carrier (5) . A second detector (CB) with a small dynamic rangeof detection, high stability and high precision also enables the measurement of the lightreflected by the carrier (5). Control circuits are used to control a focusing control device(B). A control logic is used to place the operation of the control device (B) under thecontrol of the first focusing error signal when this signal goes beyond a specified value(a) until the second focusing error signal goes beyond another specified value, theworking of the control device (B) being then placed under the control of this secondfocusing error signal.
申请人：THOMSON-CSF
代理机构：Oblon, Spivak, McClelland, Maier & Neustadt, P
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