Verlaufsblende für Belichtungsgeräte

摘要

The invention relates to an electronic recording device for recording information point by point or line by line on a recording medium by means of a modulated light beam. Said device consists of a laser diode (1) for generating a modulated light beam (2) along an optical axis (3), a graded stop (4) positioned on the optical axis (3) and a lens (5) for focussing the light beam (2) as a point of exposure (7) onto a recording material (6). The graded stop (4) gives the light beam (2) an illumination profile in the lens (5) plane which is rotationally symmetrical in relation to the optical axis (3). This prevents interfering secondary maximum values in the intensity distribution of the point of illumination (7) on the recording material (6) and thus allows for sharper point definition.