Printer, printed matter, and printing method

1. A printer comprising:

a support table to support a medium;

an ink head to discharge ink onto or toward the medium supported by the support table;

a conveyor to move the ink head relative to the medium supported by the support table; and

a controller configured or programmed to exercise control so as to print a print layer on or over the medium by using only the ink discharged from the ink head; wherein

the print layer includes:

at least one first print region including a plurality of first protrusions; and

at least one second print region including a plurality of second protrusions;

any one or more of a size, a height, a planar shape, an arrangement interval, and an arrangement direction of the first protrusions in the first print region is/are different from a corresponding one or more of a size, a height, a planar shape, an arrangement interval, and an arrangement direction of the second protrusions in the second print region; and

when an extracted area that is about 3 cm by about 3 cm is extracted from any location in the print layer, the first and second print regions are in the extracted area, and

at least either a plurality of first print regions or a plurality of second print regions are in the extracted area.

2. The printer according to claim 1 , wherein at least either the plurality of first print regions or the plurality of second print regions are spaced away from each other at least in one direction.

3. The printer according to claim 2 , wherein at least either the first print regions or the second print regions have a same shape or substantially the same shape.

4. The printer according to claim 2 , wherein at least either the first print regions or the second print regions each have a circular shape or a polygonal shape.

5. The printer according to claim 2 , wherein at least either the first print regions or the second print regions are positioned at a first interval in a first direction.

6. The printer according to claim 5 , wherein at least either the first print regions or the second print regions are positioned at a second interval in a second direction intersecting with the first direction.

7. The printer according to claim 1 , wherein

the plurality of first print regions are in the extracted area and spaced away from each other at least in one direction; and

the plurality of second print regions are in the extracted area and spaced away from each other at least in one direction.

8. The printer according to claim 7 , wherein the first and second print regions all have a same shape or substantially the same shape.

9. The printer according to claim 7 , wherein the first and second print regions are provided alternately in a first direction.

10. The printer according to claim 9 , wherein the first and second print regions are provided alternately in a second direction intersecting with the first direction.

11. The printer according to claim 7 , wherein the first and second print regions each have a circular shape or a polygonal shape.

12. The printer according to claim 7 , wherein the first print regions are different in size from the second print regions.

13. The printer according to claim 1 , wherein the first and second protrusions each have a maximum dimension of about 1 mm or less in plan view.

14. The printer according to claim 1 , wherein an interval between the first protrusions adjacent to each other is about 2 mm or less, and an interval between the second protrusions adjacent to each other is about 2 mm or less.

15. The printer according to claim 14 , wherein the interval between the first protrusions adjacent to each other is about 20 μm or more, and the interval between the second protrusions adjacent to each other is about 20 μm or more.

16. The printer according to claim 1 , wherein the first and second protrusions each have a height of about 10 mm or less.

17. The printer according to claim 1 , wherein the first and second print regions each have an area of about 400 μm 2 or more in plan view.

18. The printer according to claim 1 , wherein

the ink head includes a first ink head to discharge clear ink; and

the controller is configured or programmed to exercise control so as to print the print layer by discharging the clear ink onto or toward the medium.

19. The printer according to claim 1 , wherein

the ink head includes:

a first ink head to discharge clear ink; and

a second ink head to discharge color ink; and

the controller is configured or programmed to exercise control so as to print the print layer by discharging the clear ink and the color ink onto or toward the medium.

20. A printed matter comprising:

a medium; and

a print layer on or over the medium, the print layer being made only of ink; wherein

the print layer includes:

at least one first print region including a plurality of first protrusions; and

at least one second print region including a plurality of second protrusions;

any one or more of a size, a height, a planar shape, an arrangement interval, and an arrangement direction of the first protrusions in the first print region is/are different from a corresponding one or more of a size, a height, a planar shape, an arrangement interval, and an arrangement direction of the second protrusions in the second print region; and

when an extracted area that is about 3 cm by about 3 cm is extracted from any location in the print layer, the first and second print regions are in the extracted area, and at least either a number of first print regions or a number of second print regions in the extracted area is more than one.

21. A printing method comprising:

preparing a medium; and

printing a print layer on or over the medium by using only ink; wherein

the print layer includes:

at least one first print region including a plurality of first protrusions; and

at least one second print region including a plurality of second protrusions;

any one or more of a size, a height, a planar shape, an arrangement interval, and an arrangement direction of the first protrusions in the first print region is/are different from a corresponding one or more of a size, a height, a planar shape, an arrangement interval, and an arrangement direction of the second protrusions in the second print region; and

when an extracted area that is about 3 cm by about 3 cm is extracted from any location in the print layer, the first and second print regions are in the extracted area, and at least either a number of first print regions or a number of second print regions in the extracted area is more than one.