Device for exposing discrete portions of a photosensitive surface by means of a light beam
AssigneeEIE Electronic Industrial Equipment S.A.
InventorRoland Cerf
Life of this patent
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Abstract
The device comprises a lamp which directs a light beam to a photosensitive surface through symbols contained on a rotating disc, along a straight axis without changement of direction, the distance between the lamp and the sensitive surface being maintained constant. The device further comprises an enlarging objective movable along the optical axis and allowing to vary continuously the size of the projection of the symbols between two limits, namely between about 0.5 and 1.5 times the normal size of the symbols.
Claims16
A device for exposing discrete portions of a photosensitive surface by means of a light beam, comprising a support arranged to carry said photosensitive surface;
- an optical head arranged to direct and to control a light beam generated by a lamp, through symbols represented by masks which are distributed on a rotating disc, towards the said sensitive surface, and means for mounting and moving said optical head and/or said sensitive surface, characterized by the fact that an objective is inserted between the mask carrying disc and the sensitive surface, said objective being arranged to be moved in the path of said light beam between two limits, that the mask carrying disc is arranged to move too between two limits parallel to said light beam;
- a mechanism being provided to effect a movement of said disc relative to said objective according to an algorithm allowing to obtain a continuous enlargement or adjusted reduction of the projection on the sensitive surface of the symbols determined by said masks.
Dependencies are inferred from the claim text.