Lenticular security screen production method

Claim 1

A method for producing a positive image for deciphering by a lenticular lens having a specific regular lineation, comprising the steps of: (a) exposing a first photographic film negative to a first desired image and processing said first film negative to form a first image negative; (b) exposing a second photographic film negative to a second desired image and processing said second film negative to form a second image negative; (c) positioning a first grating screen adjacent to and above a working negative, which grating screen contains a number of parallel transparent spaces separated from each other by a number of parallel members so that the spaces and members are disposed in an alternating fashion, each of which spaces and members is of width substantially equal to one-half the width of a lenticule in the lenticular lens; (d) positioning said first image negative adjacent to and above the first grating screen and exposing said first image negative to the working negative through the first grating screen in order to create a lineated image of said first image negative on said working negative; (e) positioning an second grating screen, which has members and spaces of dimensions equal to the first grating screen, so that its members substantially cover the working negative lineated image of the first negative image, and its spaces are substantially aligned with unexposed portions of the working negative; (f) positioning said second image negative adjacent to and above the second grating screen and exposing said second image negative to said working negative through the second grating screen; and (g) exposing said working negative to form a positive image comprising a first series of parallel panels containing portions of the first image and a second series of parallel panels containing portions of the second image, each of which panels is of substantially one-half the width of a lenticule in the lenticular lens, and which panels in the first series are disposed in an alternating fashion with the panels in the second series, so that when the lenticular lens is aligned appropriately over the positive image, one of the images can be viewed.

Claim 2

A method for producing a positive image for deciphering by a lenticular lens having a specific regular lineation, comprising the steps of: (a) exposing a first photographic film negative to a first desired image and processing said first film negative to form a first image negative; (b) exposing a second photographic film negative to a second desired image and processing said second film negative to form a second image negative; (c) positioning a first grating screen adjacent to and above a working negative, which grating screen contains a number of parallel transparent spaces separated from each other by a number of parallel members so that the spaces and members are disposed in an alternating fashion, each of which spaces and members is of width substantially equal to one-half the width of a lenticule in the lenticular lens; (d) positioning said first image negative adjacent to and above the first grating screen and exposing said first image negative to the working negative through the first grating screen in order to create a lineated image of said first image negative on said working negative; (e) positioning an second grating screen, which has members and spaces of dimensions equal to the first grating screen, so that its members substantially cover the working negative lineated image of the first negative image, and its spaces are substantially aligned with unexposed portions of the working negative; (f) positioning said second image negative adjacent to and above the second grating screen and exposing said second image negative to said working negative through the second grating screen; and (g) exposing said working negative to form a positive image comprising a first series of parallel panels containing portions of the first image and a second series of parallel panels containing portions of the second image, each of which panels is of substantially one-half the width of a lenticule in the lenticular lens, and which panels in the first series are disposed in an alternating fashion with the panels in the second series, so that when the lenticular lens is aligned appropriately over the positive image, one of the images can be viewed.

Claim 11

A method for producing a positive image for deciphering by a lenticular lens having a specific regular lineation, comprising the steps of: (a) exposing a first photographic film negative to a first desired image and processing said first film negative to form a first image negative; (b) exposing a second photographic film negative to a second desired image and processing said second film negative to form a second image negative; (c) positioning a lenticular lens flat side adjacent to a working film negative, positioning the first image negative adjacent to the lens side of the lenticular lens, and exposing the first film negative to the working negative through the lenticular lens; (d) positioning the lenticular lens one-half lenticule-width orthogonal to the longitudinal direction of the lenses, relative to the position it was in during exposure of the first image negative, and flat side adjacent to the working film negative, positioning the second image negative adjacent to the lens side of the lenticular lens, and exposing the second film negative to the working negative through the lenticular lens; and (e) exposing said working negative to form a positive image comprising a first series of parallel panels containing portions of the first image and a second series of parallel panels containing portions of the second image, each of which panels is of substantially one-half the width of a lenticule in the lenticular lens and which panels in the first series are disposed in an alternating fashion with the panels in the second series, so that when the lenticular lens is aligned properly over the positive image, one of the images can be viewed.

Claim 12

A method for producing a positive image for deciphering by a lenticular lens having a specific regular lineation, comprising the steps of: (a) exposing a first photographic film negative to a first desired image and processing said first film negative to form a first image negative; (b) exposing a second photographic film negative to a second desired image and processing said second film negative to form a second image negative; (c) positioning a lenticular lens flat side adjacent to a working film negative, positioning the first image negative adjacent to the lens side of the lenticular lens, and exposing the first film negative to the working negative through the lenticular lens; (d) positioning the lenticular lens one-half lenticule-width orthogonal to the longitudinal direction of the lenses, relative to the position it was in during exposure of the first image negative, and flat side adjacent to the working film negative, positioning the second image negative adjacent to the lens side of the lenticular lens, and exposing the second film negative to the working negative through the lenticular lens; and (e) exposing said working negative to form a positive image comprising a first series of parallel panels containing portions of the first image and a second series of parallel panels containing portions of the second image, each of which panels is of substantially one-half the width of a lenticule in the lenticular lens and which panels in the first series are disposed in an alternating fashion with the panels in the second series, so that when the lenticular lens is aligned properly over the positive image, one of the images can be viewed.