Electronic graphic detecting head

摘要

Electronic graphic detecting head includes lamps for lighting a zone in which the said graphics may be presented, lenses for focusing on a detecting means designed to convert light signals into electric analogue signals and circuitry designed to supply a digital conversion of the said analogue signals. The main characteristic of the said electronic head consists in a first threshold-generating block designed to supply a comparator block with a first signal depending on the reflection of a support (3) bearing the said graphics, and a second block for intensifying the difference in value of the said analogue signal from successively-scanning elements on the said detecting means and designed to supply a second signal to the comparator block which supplies a third digital output signal representing the said graphics.