Medium having heat-sensitive medium and adhesive medium whose width is greater than width of heat-sensitive medium, cartridge including the medium, and method for creating the medium

1. A medium for use in a thermal printer, the medium comprising:

a heat-sensitive medium defining a thickness in a thickness direction and a width in a width direction crossing the thickness direction, the heat-sensitive medium comprising:

a base material; and

a first heat-sensitive layer configured to produce a first color when heated above a first temperature; and

an adhesive medium laminated over the heat-sensitive medium in the thickness direction, the first heat-sensitive layer being positioned between the base material and the adhesive medium in the thickness direction, the adhesive medium comprising:

an adhesive-medium base material; and

an adhesive layer provided at the adhesive-medium base material,

wherein the adhesive medium defines a width greater than the width of the heat-sensitive medium in the width direction; and

wherein the width of the adhesive medium is defined to satisfy an inequality

K<N≤K+ 2 t,

in which:

N represents the width of the adhesive medium in the width direction;

K represents the width of the heat-sensitive medium in the width direction; and

t represents the thickness of the heat-sensitive medium in the thickness direction.

2. The medium according to claim 1 ,

wherein the heat-sensitive medium further comprises a second heat-sensitive layer interposed between the base material and the first heat-sensitive layer in the thickness direction, the second heat-sensitive layer being configured to produce a second color different from the first color when heated above a second temperature different from the first temperature.

3. The medium according to claim 2 ,

wherein the heat-sensitive medium further comprises a heat-insulating layer interposed between the first heat-sensitive layer and the second heat-sensitive layer in the thickness direction.

4. The medium according to claim 1 ,

wherein the base material has transparency, and

wherein the adhesive medium is bonded to the heat-sensitive medium such that the first heat-sensitive layer is positioned between the base material and the adhesive medium in the thickness direction.

5. The medium according to claim 1 ,

wherein the adhesive-medium base material has transparency, and

wherein the adhesive medium is bonded to the heat-sensitive medium such that the first heat-sensitive layer is positioned between the base material and the adhesive medium in the thickness direction.

6. The medium according to claim 1 ,

wherein the adhesive layer has flexibility in the thickness direction.

7. The medium according to claim 6 ,

wherein the heat-sensitive medium is bonded to the adhesive medium such that the heat-sensitive medium sinks into the adhesive layer to reduce a thickness of the adhesive layer in the thickness direction.

8. A cartridge comprising:

a case accommodating the medium according to claim 1 ;

a first supporting portion provided at the case for supporting the heat-sensitive medium inside the case; and

a second supporting portion provided at the case for supporting the adhesive medium inside the case.

9. The cartridge according to claim 8 ,

wherein the case comprises a guide portion configured to guide the heat-sensitive medium to a position where the adhesive medium is laminated over and bonded to the heat-sensitive medium.

10. The cartridge according to claim 8 ,

wherein the case further comprises:

a first conveying path for guiding the heat-sensitive medium in a longitudinal direction of the heat-sensitive medium from the first supporting portion;

a second conveying path for guiding the adhesive medium in a longitudinal direction of the adhesive medium from the second supporting portion; and

a first restricting portion provided at the first conveying path and configured to restrict movement of the heat-sensitive medium in the width direction, and

wherein the heat-sensitive medium passing through the first restricting portion is bonded to the adhesive medium conveyed along the second conveying path such that the adhesive medium protrudes out from widthwise edges of the heat-sensitive medium in the width direction.

11. The cartridge according to claim 10 ,

wherein the case further comprises a second restricting portion provided at the second conveying path and configured to restrict movement of the adhesive medium in the width direction, and

wherein the heat-sensitive medium passing through the first restricting portion along the first conveying path is bonded to the adhesive medium passing through the second restricting portion along the second conveying path such that the adhesive medium protrudes out from widthwise edges of the heat-sensitive medium in the width direction.

12. The cartridge according to claim 8 ,

wherein the case further comprises:

a first conveying path for guiding the heat-sensitive medium in a longitudinal direction of the heat-sensitive medium from the first supporting portion;

a second conveying path for guiding the adhesive medium in a longitudinal direction of the adhesive medium from the second supporting portion;

a first restricting portion provided at the first conveying path and configured to restrict movement of the heat-sensitive medium in the width direction along the first conveying path; and

a second restricting portion provided at the second conveying path and configured to restrict movement of the adhesive medium in the width direction along the second conveying path, and

wherein the heat-sensitive medium passing through the first restricting portion and the adhesive medium passing through the second restricting portion are bonded together such that widthwise centers of the heat-sensitive medium and the adhesive medium are aligned with each other in the width direction.

13. A method for creating the medium according to claim 1 , the method comprising:

a printing step to apply heat to the heat-sensitive medium to form an image in the heat-sensitive medium; and

a laminating step to bond the adhesive medium to the heat-sensitive medium on which the image is formed to create the medium.

14. The method according to claim 13 ,

wherein the base material has transparency, and

wherein, in the laminating step, the adhesive medium is bonded to the heat-sensitive medium such that the first heat-sensitive layer is positioned between the base material and the adhesive medium in the thickness direction.

15. The method according to claim 13 ,

wherein the adhesive-medium base material has transparency, and

wherein, in the laminating step, the adhesive medium is bonded to the heat-sensitive medium such that the first heat-sensitive layer is positioned between the base material and the adhesive medium in the thickness direction.

16. The method according to claim 13 , further comprising a positioning step to perform positioning of the heat-sensitive medium relative to the adhesive medium with respect to the width direction such that the adhesive medium protrudes out from widthwise edges of the heat-sensitive medium in the width direction, the positioning step being performed before the laminating step,

wherein, in the laminating step, the adhesive medium is laminated and bonded to the heat-sensitive medium such that the adhesive medium protrudes out from widthwise edges of the heat-sensitive medium in the width direction.