Electronics and Telecommunications Research Institute

SangChul Lim

Kyoung Ik Cho

Yong Suk Yang

Seongdeok Ahn

Jiyoung Oh

A micro ballpoint pen enabling to print directly straight, oblique, curved, dashed, broken and wavy lines and a printing apparatus including the same. The micro ballpoint pen may include a tip body including a caulking portion, at least one inner protrusion, and at least one expansible or shrinkable elastic portion, a ball provided between the caulking portion and the inner protrusion, the ball contacting and rolling on a target printing object to eject ink onto the target printing object, a supporting bar pressing the ball toward the caulking portion to form an ink outflowing channel between the caulking portion and the ball, and a control part expanding or shrinking the elastic portion to control the ink outflowing channel.

Micro ballpoint pen and printing apparatus

A hybrid composition includes poly-4-vinylphenol; a sodium compound; an aluminum compound; and a cross-linking agent effective to accelerate a cross-linking reaction of the ploy-4-vinylphenol, wherein, based on total weight of the poly-4-vinylphenol, the sodium compound and the aluminum compound, content of the poly-4-vinylphenol is 69 wt % to 99.89 wt %, content of the sodium compound is 0.01 wt % to 1 wt %, and content of the aluminum compound is 0.1 wt % to 30 wt %, and wherein content of the cross-linking agent ranges from 10 wt % to 30 wt % in an organic composition including the poly-4-vinylphenol and the cross-linking agent. A hybrid insulation layer that is dielectric and includes cross-linked poly-4-vinyl phenol is provided from the foregoing hybrid organic-inorganic composition.

Growing community of inventors

Daejeon, South Korea

SangChul Lim