Method of subtitling motion picture films

Details Method of subtitling motion picture films Method of subtitling motion picture films

1992-10-09

1994-11-22

Gellner, Michael L.

Optics: motion pictures

Special effects

Titling devices

G03B 2132

Patent

active

053673484

ABSTRACT:
A method of subtitling motion picture films in which graphics elements, characters, or texts are added to a motion picture film by means of a laser beam travelling over the zone to be marked of the film, comprises the following two steps: a first step, in which a laser etching operation is performed by applying a laser beam whose speed of displacement over the film lies in the range about 1 cm/s to about 200 cm/s, with its power on the film lying in the range about 100 milliwatts to about 20 watts, and with the ratio V/P of the displacement speed expressed in cm/s divided by the power on the film expressed in watts lying in the range 10 to 30 so as to be high enough for the laser beam to achieve complete transformation of the emulsion in the etched zones by causing the emulsion to be heated, softened, and dislocated, but without totally eliminating the transformed emulsion; and a second step, in which the etched film is subjected to cleaning treatment for cleaning the etched zones so that the particles of emulsion that have been heated and dislocated by the laser beam are eliminated from those zones of the film that have previously been marked by the low power laser beam, thereby causing transparent subtitles to appear.

REFERENCES:
patent: 4503135 (1985-03-01), Drexler
patent: 4766009 (1988-08-01), Imura et al.
patent: 4854696 (1989-08-01), Guez

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