Patent ID: 11906903
Assignee: VISITECH AS
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A device for measuring reference points in real time during lithographic printing, comprising:
a light source providing an exposure beam;
a light modulator modulating the exposure beam according to an exposure pattern;
a measurement system comprising a camera, the measurement system configured to define at least one camera area of interest to optimize fast camera data transfer and to measure a position of a number of alignment marks previously arranged on a substrate; and
an exposure optical system comprising a control unit, the exposure optical system delivering the modulated exposure beam as an image provided by the light modulator onto the substrate;
wherein the exposure system control unit is configured to:
calculate the orientation of the substrate based on the position of the alignment marks simultaneously to delivering the modulated exposure beam, and
control the delivering of the modulated exposure beam relative to the calculated orientation of the substrate.