Method and system for controlling the relative size of images fo

Details Method and system for controlling the relative size of images fo Method and system for controlling the relative size of images fo

1995-06-07

1997-06-03

Krynski, William

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

428174, 428179, 428221, 4284111, 428929, 430311, 430312, B32B 300

Patent

active

056352859

ABSTRACT:
A method of exposing a radiation-sensitive medium through a mask and using an imaging system having a given depth of focus to control for pattern dependent distortion. The steps comprise: providing the radiation-sensitive medium within the depth of focus of the imaging system; providing radiation to the radiation-sensitive medium through the mask; providing the radiation-sensitive medium fully outside the depth of focus of the imaging system; and providing radiation to the radiation-sensitive medium through the mask. Corrections are automatically made by providing the radiation-sensitive medium fully outside the depth of focus of the imaging system, since in that regime the mask operates as a grey-scale mask, with the amount of light passing through any region of the mask dependent on the transmission of the masking pattern in that region.

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