Device for achieving a substantially uniform distribution of the light in the picture plane of a reproduction camera
AssigneeEskofot A/S
InventorFinn Hougaard
Life of this patent
Estimating the term…
Abstract
A device for achieving a substantially uniform distribution of the light in the picture plane of a reproduction camera by providing a suitable distribution of the light in the original plane (8), whereby the desired distribution of the light in the original plane is obtained by means of illuminating means comprising adjustable screening members (12). According to the invention the screening members are adjusted by means of a computer in response to the desired enlargement. A light sensor adjacent the picture plane compensates automatically for the influence of the screening members on the main exposure.
Claims10
A device for achieving a substantially uniform distribution of light in a picture plane of a reproduction camera by providing a suitable distribution of the light in a plane of an original, comprising:
- illuminating means for producing a desired distribution of the light in the original plane;
- a plurality of adjustable screening members, each of a four-sided shape formed by two isosceles triangles coupled to said illuminating means to adjustably screen the light produced by said illuminating means;
- and
- means for automatically adjusting a position of the screening members in response to a desired amount of enlargement.
A device for achieving a substantially uniform distribution of light in a picture plane of a reproduction camera by providing a suitable distribution of the light in a plane of an original, comprising:
- illuminating means for producing a desired distribution of light in the original plane;
- a plurality of adjustable screening members, formed so as to be able to screen for light to the center of the original table coupled to said illuminating means to adjustably screen the light produced by said illuminating means;
- and
- means for automatically adjusting a position of the screening members in response to a desired amount of enlargement.
A device for achieving a substantially uniform distribution of light in a picture plane of a reproduction camera by providing a suitable distribution of the light in a plane of an original, comprising:
- illuminating means for producing a desired distribution of light in the original plane;
- a plurality of adjustable screening members, each of a shape to adjustably screen the light produced by said illuminating means such that the center of the original table is screened more than edges thereof;
- and
- means for automatically adjusting a position of the screening members in response to a desired amount of enlargement.
Dependencies are inferred from the claim text.