Imprint control system with feedback feature
OwnerKari Kirjavainen, Asko S. Riekkineninventors
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Abstract
A procedure for controlling the imprint in reproductive printing. With a view to providing a versatile printing control system, and one which eliminates the maximum of errors, the invention is mainly characterized in that by means of an optical system is formed an image signal consistent with the imprint and which is compared with a set-point image signal produced in one way or another, from the result of comparison thus obtained being formed an electrical differential signal, which according to the feedback principle controls the formation of the imprint of each object under examination.
Claims12
A process for controlling formation of an imprint having individual picture elements in reproductive printing by means of an optical system comprising the steps of:
- forming an imprint image signal corresponding to the imprint;
- forming a set-point image signal;
- comparing said imprint image signal with said set-point image signal;
- forming an electrical differential signal from the result of comparison thus obtained;
- and
- according to the feedback principle controlling the formation of the imprint of each object under examination.
The process according to clam 7, wherein said optical system comprises a lighting means, and at least two substantially identical branches, and the light from said lighting means is used to produce both the imprint and set-point image signals simultaneously with the aid of said two substantially identical branches of the optical system.
Dependencies are inferred from the claim text.