Mitsubishi Pencil Company, Limited

Chihiro Mochizuki

Toshimi Kamitani

Hirotake Izawa

Wataru Sagawa

Kaito Tsukada

A writing instrument in which condensation does not occur in a cap even though the writing instrument is equipped with the cap and which has high writing instrument quality and commercial value. The writing instrument includes at least a barrel in which an aqueous ink is contained; a pen tip provided on a tip side of the barrel and capable of discharging the aqueous ink; and a cap that is removably attached on a pen tip side of the barrel, wherein the aqueous ink has a vapor pressure of 10.3 to 12.3 kPa at 50° C.

Writing instrument

Provided is a writing implement that maximizes the effective area of a viewer portion allowing visual recognition in the writing direction and that facilitates writing at a high level, at the same time. This writing implement is a writing implement A, including for example, a pen tipthat feeds ink from a writing implement bodyand has a viewer portionallowing visual recognition in the writing direction. The pen tipis comprised of, at least, a writing partand a retainerhaving the viewer portion, an ink feeder portionfor feeding the ink from the writing implement bodyto the writing part. The minimum width X of the viewer portionis 3.7 mm or greater and a length Y of the viewer portionis 7.4 mm or greater. The ink feeder portionis arranged on one side of the viewer portion. Specifically, the ink feeder portionis preferably adapted to be positioned on a near side during writing (on such a side that the pen tipis located on an obtuse angle side of the ink feeder portion).

Growing community of inventors

Tokyo, Japan

Chihiro Mochizuki