Method for fabricating a translucent graded density membrane

Details Method for fabricating a translucent graded density membrane Method for fabricating a translucent graded density membrane

G - Physics

03

F

95/94.5

G03F 5/00 (2006.01) G03C 5/02 (2006.01)

Patent

CA 1145996

Abstract of the Disclosure A method and apparatus for exposing a section of photographic medium such that it exhibits an incre- mental gradient in optical density across an area of the medium. A source of radiant energy is located in a container, which container is covered by a ground glass plate. This plate is covered by an opaque sheet, which sheet contains a narrow aperture. This sheet is covered by a second ground glass plate, such that the edge of the second plate overlies the edge of the aper- ture. A camera is focused on the surface of the opaque sheet. A portion of the light from the light source is diffused through the edge of the second plate and re- flected toward the camera from the surface of the opaque sheet, causing the resultant image captured on the medium when the camera is activated to show a change in optical density with respect to the distance from the image on the medium of the edge of the second plate.

367614

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