Patent ID: 7180578

Claim:
An assembly for exposing a double-sided printed circuit panel to light transmitted through a first artwork and a second artwork, the first and second artworks each being provided with a registration mark, the assembly comprising: a bed fixed in a substantially horizontal plane, first and second artwork supports constructed and arranged to support the first artwork and the second artwork, respectively, means for for moving the first and second artwork supports towards and away from each other, holding means for holding the printed circuit panel fixed in its plane with respect to the bed, the printed circuit panel being held between the first and second artwork supports, the printed circuit panel being provided with a positional registration marking, detection means for detecting position errors between the printed circuit panel and the first and the second artwork supports, wherein a detected positioning error between the printed circuit panel and at least the first artwork support is common displacement information, and wherein a detected positioning error between the second artwork support and one of the first artwork support and the printed circuit panel is separate displacement information, means for generating and directing a light beam toward each of the first and second artwork supports, common displacement means for jointly displacing the first and second artwork supports in their plane with respect to the bed in accordance with the common displacement information, and separate displacement means for independently displacing the second artwork support in its plane with respect to the first artwork support in accordance with the separate displacement information.