Thermal transfer light pen and thermal transfer apparatus

1. A thermal transfer light pen comprising:

a hollow pen body including a front end portion;

a pressing body disposed in the front end portion of the pen body and including a curved surface projecting toward a front end;

a light guide including a first end and a second end, at least a portion of the light guide being disposed inside the pen body; and

a light source connected to the first end of the light guide; wherein the second end of the light guide is disposed in the pen body and faces the pressing body at the front end portion of the pen body;

the pressing body is made of a material transparent to light emitted from the light source;

the front end portion of the pen body includes a through hole located on a center axis of the pen body;

the front end portion of the pen body includes an inner wall surrounding the through hole;

a portion of the pressing body is disposed inside the through hole and in contact with the inner wall;

at least a portion of the curved surface of the pressing body is located outside the through hole; and

the inner wall includes a first projecting wall portion with an inner diameter that increases toward the front end of the pen body in a first vertical cross section passing through the center axis of the pen body, and also includes a second projecting wall portion with an inner diameter that decreases toward the front end of the pen body in a second vertical cross section passing through the center axis of the pen body.

2. The thermal transfer light pen according to claim 1 , wherein the curved surface is a hemispherical surface.

3. The thermal transfer light pen according to claim 2 , wherein the pressing body is spherical.

4. The thermal transfer light pen according to claim 2 , wherein the pressing body is hemispherical.

5. The thermal transfer light pen according to claim 1 , wherein the first vertical cross section and the second vertical cross section are perpendicular or substantially perpendicular to each other.

6. The thermal transfer light pen according to claim 1 , wherein

the pressing body is pinched between the first projecting wall portion and the second projecting wall portion of the inner wall; and

the front end portion of the pen body does not include an adhesion portion that bonds the pressing body and the inner wall to each other.

7. The thermal transfer light pen according to claim 1 , wherein at least the front end portion of the pen body is made of an elastically deformable material.

8. The thermal transfer light pen according to claim 1 , wherein the pressing body is made of glass.

9. A thermal transfer apparatus comprising:

the thermal transfer light pen according to claim 1 ;

a placing table on which a transfer object is placed;

a conveyor that moves the placing table and the thermal transfer light pen relative to each other; and

a controller that is connected to the light source provided in the thermal transfer light pen and the conveyor to enable communication with the light source and the conveyor, and drives the light source and the conveyor; wherein

the controller causes the thermal transfer light pen and the placing table to be moved relative to each other by the conveyor so that the pressing body of the thermal transfer light pen is pressed against the transfer object and to supply light from the light source of the thermal transfer light pen onto the transfer object.