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Optical printing devices for printing on blanks which are intended for swaging
| Details |
Inventors: Vany, Gerard;
Assignee: Cebal (Clichy, FR)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A device is disclosed for printing on blanks which are intended for swaging, to obtain a predeformed image on the blanks which, following swaging, will reconstitute the original image. The device comprises a light source (2), a toric prism (4) and a camera (8) having a common optical axis (12). The angle of the toric prism is smaller than 42.05.degree., and the surface (11) of the prism facing the camera (8) forms a linearity correction lens. |
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DETAILED DESCRIPTION I claim: 1.
Device for the printing of blanks which are intended for swaging, to obtain a preformed image on the blanks which, following swaging, will reconstitute the original image, comprising a light source, a toric prism, and a camera having a common optical axis, the angle of said toric prism being less than 42.
05.
degree.
, and said toric prism having a surface facing said camera forming a linearity correction lens, the cutting of said lens-forming surface being defined, in a system of parametric coordinates x.
sub.
t and y.
sub.
t centered on the intersection point of the optical axis, and by a reference plane parallel to said surface of the prism, defined by the equations: ##EQU24## the C.
sub.
1, C.
sub.
2, C.
sub.
3, and C.
sub.
4 parameters being defined from the inside diameter .
PHI.
.
sub.
o and the height H of toric prism, from the offset A of the plate to be reproduced in relation to the edge of the prism, from the focal length F of the lens of camera and from the refraction index n of the material forming the prism and from the top angle (45 -.
alpha.
) of said prism.
2.
Printing device as in claim 1, wherein the angle of said toric prism is between 35.
degree.
and 32.
degree.
.
3.
Printing device as in claim 1 or 2, wherein the lens and the prism are obtained by simultaneous cutting in one single system.
4.
Printing device as in claim 1 or 2, wherein the lens and the prism are obtained by separate cutting and very fine polishing of the facing surfaces, which are then placed in contact so as to form a monolithic block.
Description:
The invention concerns an improvement to be applied to optical printing devices for printing on blanks which are intended for the manufacture of cans by swaging.
Cans are decorated either by means of a strip of paper which is preprinted and wound around and glued onto the can, or by direct printing on the can, or else by printing of the blank which is then to produce the can by swaging.
In this case, the blank generally must be printed with a predeformed image in such a manner that the original image will be reconstituted following the swaging
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