Writing instrument
AssigneeKabushiki Kaisha Pilot Corporation
InventorsHirotaka MASUDA, Naoto MASUSHIGE
Life of this patent
Estimating the term…
Abstract
[Problem to be Solved] Provided is a writing instrument, in which stable writing performance can be maintained for a long term, and a feeling of writing and handwriting are favorable. [Solution] A writing instrument including: a pen point retaining member; a pen point that is attached to a first end of the pen point retaining member; an ink tank that is attached to a second end of the pen point retaining member; and an ink for a writing instrument that is accommodated in the ink tank. The ink includes a lubricating interface layer-forming compound, and a carbonaceous film is formed on at least one of a surface of the ball or a contact portion of the ball holding portion with the ball.
Claims9
A writing instrument comprising:
- a pen point retaining member;
- a pen point that comprises a ball and a ball holding portion that rotatably holds the ball, and is attached to a first end of the pen point retaining member;
- an ink tank that is attached to a second end of the pen point retaining member;
- and
- an ink for a writing instrument that is accommodated in the ink tank and comprises a lubricating interface layer-forming compound,
- wherein a carbonaceous film is formed on at least one of a surface of the ball or a contact portion of the ball holding portion with the ball;
- and the carbonaceous film comprises a carbon atom and an oxygen atom bound to the carbon atom.
Dependencies are inferred from the claim text.