To the etching by a laser beam under - securities simultaneously on one or more images of a film cinematographique

摘要

A frame 7 carries a striker mobile and parallel to a fixed base plate 8 of the frame, this oscillator having two parallel plates and integral with one another, 13, 14, leaving between them a space for the passage of the film to be etched 1 and extending both substantially over a length of film corresponding to the number of images to be quantified in - once. This oscillator 13, 14 is connected operatively to a motor 10 is controlled by means of synchronization and adapted to be subjected to reciprocating motion will -, - between a position "applied " for which, during a stop phase of the film, one (13) of said plates is applied against the plate 8 of said frame, and a position" spread " for which this same plate is spaced away from said plate. This plate 8 carries at least the first (i) and second (ii) positioning studs of the film, in which engage two of the perforations 2, 3 that - latter when the driver is applied, the distance between consecutive of the striker with respect to the plate 8 for the release of the film with respect to the positioning studs and its return to free movement between the plates (13, 14) of the striker in the separated position, until the next position of the etching.