Ink bottle

1. An ink bottle, comprising:

a container main body configured to contain ink that is to be supplied to an ink tank;

an ink outlet forming portion provided on an end of the container main body and configured to include an ink outlet that causes the ink to be flowed out from the container main body;

a valve provided in the ink outlet forming portion and configured to seal the ink outlet in an openable and closable manner, wherein

the ink outlet is formed in an end face of the ink outlet forming portion,

the end face is arranged to face an opposite side of the ink outlet forming portion that is opposite to a container main body side thereof,

a first recess is formed in an outer side portion of the ink outlet on the end face to be recessed toward the container main body side,

the ink outlet forming portion is configured to include a cylindrical portion that is in a cylindrical form and is arranged to surround the ink outlet,

a level difference is formed in an outer wall of the cylindrical portion, and

the ink tank is configured to include a connection portion that is connectable with the ink outlet; and

a positioning element configured to specify a position of the valve relative to the ink tank when the ink outlet is connected with the connection portion of the ink tank and the valve is opened, wherein

the positioning element is located on an outer side of the cylindrical portion of the ink outlet forming portion and is joined with the cylindrical portion via a coupling element, and

the coupling element is provided at a position farther from the ink outlet than the level difference in an axial direction of a center axis of the ink outlet.

2. The ink bottle according to claim 1 ,

wherein a second recess is provided in an outer circumferential portion of the container main body to be recessed inward of the container main body, and

the second recess is positioned closer to an end of the container main body that is opposite to an end of the container main body corresponding to the ink outlet forming portion.

3. The ink bottle according to claim 1 , wherein at least a radial outer side of the first recess is completely surrounded by a wall.

4. The ink bottle according to claim 1 , wherein the first recess is open and not filled when the ink bottle is mounted to the ink tank.

5. The ink bottle according to claim 1 , wherein the first recess is open and not filled when a cover member covers the ink outlet forming portion.

6. An ink bottle, comprising:

a container main body configured to contain ink that is to be supplied to an ink tank;

an ink outlet forming portion provided on an end of the container main body and configured to include an ink outlet that causes the ink to be flowed out from the container main body; and

a valve provided in the ink outlet forming portion and configured to seal the ink outlet in an openable and closable manner, wherein

the ink outlet is formed in an end face of the ink outlet forming portion,

the end face is arranged to face an opposite side of the ink outlet forming portion that is opposite to a container main body side thereof, and

a first recess is formed in an outer side portion of the ink outlet on the end face to be recessed toward the container main body side,

wherein the first recess is open and not filled when the ink bottle is mounted to the ink tank.

7. The ink bottle according to claim 6 ,

wherein a second recess is provided in an outer circumferential portion of the container main body to be recessed inward of the container main body, and

the second recess is positioned closer to an end of the container main body that is opposite to an end of the container main body corresponding to the ink outlet forming portion.

8. The ink bottle according to claim 6 ,

wherein the ink outlet forming portion is configured to include a cylindrical portion that is in a cylindrical form and is arranged to surround the ink outlet, and

a level difference is formed in an outer wall of the cylindrical portion.

9. The ink bottle according to claim 6 , wherein at least a radial outer side of the first recess is completely surrounded by a wall.

10. The ink bottle according to claim 6 , wherein the first recess is open and not filled when a cover member covers the ink outlet forming portion.

11. An ink bottle, comprising:

a container main body configured to contain ink that is to be supplied to an ink tank;

an ink outlet forming portion provided on an end of the container main body and configured to include an ink outlet that causes the ink to be flowed out from the container main body; and

a valve provided in the ink outlet forming portion and configured to seal the ink outlet in an openable and closable manner, wherein

the ink outlet is formed in an end face of the ink outlet forming portion,

the end face is arranged to face an opposite side of the ink outlet forming portion that is opposite to a container main body side thereof, and

a first recess is formed in an outer side portion of the ink outlet on the end face to be recessed toward the container main body side,

wherein the first recess is open and not filled when a cover member covers the ink outlet forming portion.

12. The ink bottle according to claim 11 ,

wherein a second recess is provided in an outer circumferential portion of the container main body to be recessed inward of the container main body, and

the second recess is positioned closer to an end of the container main body that is opposite to an end of the container main body corresponding to the ink outlet forming portion.

13. The ink bottle according to claim 11 ,

wherein the ink outlet forming portion is configured to include a cylindrical portion that is in a cylindrical form and is arranged to surround the ink outlet, and

a level difference is formed in an outer wall of the cylindrical portion.

14. The ink bottle according to claim 11 , wherein at least a radial outer side of the first recess is completely surrounded by a wall.