专利名称：Focusing screen for photographic cameras发明人：Rolf Jurenz,Horst Kodalle申请号：US05/930126申请日：19780801公开号：US04182564A公开日：19800108
摘要：The invention relates to a focusing screen for photographic cameras with split-image range finder, of which the wedges lying side by side are inclined oppositely to oneanother and extend obliquely of the lateral edges of the focusing screen.
Known focusing screens of this kind each have a pair of coincidence wedges inclinedoppositely at equal angles. In order that horizontal and vertical contours can be used forfocusing, the single line of intersection between the coincidence wedge pair is arrangedobliquely in relation to the lateral edges of the focusing screen. In comparison with awedge pair with horizontal or vertical line of intersection, as a result of this obliquearrangement of the intersection line the accuracy of measurement reduces.
< P>In accordance with the invention this is achieved in that on both sides of a centralwedge there are provided lateral wedges inclined oppositely thereto which have thesame angle of inclination as one another. Due to this arrangement one obtains at leasttwo intersection lines extending parallel and with spacing from one another, so that theaccuracy of measurement is increased for the same physiological perception threshold ofthe photographer.
申请人：VEB PENTACON DRESDEN KAMERA UND KINOWERKE
代理人：William A. Drucker
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