Marking device, medium, container, and marking method

1. A marking device comprising:

a first marker including a first optical system having a first focal point, the first marker being configured to concentrate a first light onto a first area of a non-planar portion of a medium to perform marking on the first area, the non-planar portion including a plurality of areas including the first area and a second area,

a second marker including a second optical system having a second focal point, the second marker being configured to concentrate a second light onto the second area to perform the marking on the second area, the second focal point of the second optical system being different from the first focal point of the first optical system in a direction parallel to a central axis of the first optical system; and

a controller configured to:

receive image data including control conditions for the first and second markers,

correct the received image data to compensate for trapezoidal distortion of a projected image based on a shape of the non-planar portion, and

control each of the first marker and the second marker based on the corrected image data to form a predetermined image on the medium.

2. The marking device according to claim 1 ,

wherein the non-planar portion has a curvature in a curvature direction, and

wherein as a maximum height difference in each one of the plurality of areas is larger in the direction parallel to the central axis of the first optical system, a width of each one of the plurality of areas in the curvature direction is smaller.

3. The marking device according to claim 1 , further comprising

a plurality of markers including the first marker and the second marker,

wherein focal points of laser beams emitted from the plurality of markers are different from each other in the direction parallel to the central axis of the first optical system.

4. A marking device comprising:

a first marker including a first optical system having a first central axis, the first marker being configured to concentrate a first light onto a first area of a non-planar portion of a medium to perform marking on the first area, the non-planar portion including a plurality of areas including the first area and a second area; and

a second marker including a second optical system having a second central axis, the second marker being configured to concentrate a second light onto the second area to perform the marking on the second area,

wherein the first central axis of the first optical system is orthogonal to a plane intersecting with the first area,

wherein the second central axis of the second optical system is orthogonal to a plane tangent to the second area and is not parallel to the first central axis of the first optical system, and wherein the device further comprises a controller configured to:

receive image data including control conditions for the first and second markers,

correct the received image data to compensate for trapezoidal distortion of a projected image based on a shape of the non-planar portion, and

control each of the first marker and the second marker based on the corrected image data to form a predetermined image on the medium.

5. A marking device comprising:

a first marker having a first optical system, the first marker being configured to concentrate a first light onto a first area of a non-planar portion of a medium to perform marking on the first area, the non-planar portion including a plurality of areas including the first area and a second area, the medium being conveyed in a conveyance direction;

a second marker having a second optical system, the second marker being configured to concentrate a second light onto the second area to perform the marking on the second area; and

an adjuster disposed between the first marker and the second marker in the conveyance direction, the adjuster being configured to change a direction of the non-planar portion,

wherein the second marker is configured to perform the marking on the second area after the first marker performs the marking on the first area and the adjuster changes the direction of the non-planar portion, and wherein the device further comprises a controller configured to:

receive image data including control conditions for the first and second markers,

correct the received image data to compensate for trapezoidal distortion of a projected image based on a shape of the non-planar portion, and

control each of the first marker and the second marker based on the corrected image data to form a predetermined image on the medium.

6. The marking device according to claim 1 ,

wherein the first area includes a non-overlapping area that does not overlap with the second area.

7. The marking device according to claim 1 ,

wherein the first marker is configured to perform the marking in parallel with the second marker.

8. The marking device according to claim 1 ,

wherein the first area overlaps with the second area.

9. The marking device according to claim 1 ,

wherein the controller is configured to increase or reduce a size of an image indicated by the image data to correct the image data.

10. The marking device according to claim 1 ,

wherein the controller is configured to correct the image data so that a level of gradation of a joint between the first area and the second area does not change or gradually changes.

11. The marking device according to claim 1 ,

wherein the first marker is configured to perform raster scanning with the first light in a longer-side direction of the first area, and

wherein the second marker is configured to perform raster scanning with the second light in a longer-side direction of the second area.

12. The marking device according to claim 1 ,

wherein at least one of the first marker or the second marker includes a plurality of laser beam sources, and

wherein the at least one of the first marker or the second marker is configured to concentrate a laser beam emitted from each of the plurality of laser beam sources to perform the marking.

13. The marking device according to claim 1 , further comprising:

a plurality of first markers including the first marker;

a first marker group in which the plurality of first markers are stacked on top of each other in a prescribed stacking direction; and

a plurality of second markers including the second marker; and

a second marker group in which the plurality of second markers are stacked on top of each other in the prescribed stacking direction.

14. A medium comprising

the non-planar portion marked by the marking device according to claim 1 .

15. A container comprising:

the medium according to claim 14 ; and

a to-be-contained object stored in the medium.