公开(公告)号：EP4245560A1

公开(公告)日：2023-09-20

申请号：EP21892021.3

申请日：2021-11-15

申请人： Kabushiki Kaisha Pilot Corporation (also trading as Pilot Corporation)

发明人： KAJIWARA Takumi ,  MASUSHIGE Naoto

IPC分类号： B43K1/08

摘要： The ballpoint pen tip (40) comprises: a ball (42) having a diameter of 0.5 mm or less; and a tip body (50) that holds the ball, wherein the tip body has a ball holding chamber (52) that holds the ball, a rear hole (57) located rearward of the ball holding chamber, an ink flow hole (62) that allows the ball holding chamber and the rear hole to communicate with each other, and an ink flow groove (64) extending in a radial direction (dr) from the ink flow hole, opening to the ball holding chamber, and not reaching the rear hole, a ratio (A/B) of an ink consumption A per 100 m of handwriting to a diameter B of the ball is 200 mg/mm or more and 800 mg/mm or less, and when a front end (64a) of the ink flow groove is set as a start point S1 and a position of 0.3 mm rearward from the front end (62a) of the ink flow hole is set as an end point S2, a volume of a first space (SA) in the ink flow hole and the ink flow groove from the start point to the end point is 0.02 mm 3 or more.

公开(公告)号：EP3988322A1

公开(公告)日：2022-04-27

申请号：EP20827925.7

申请日：2020-06-17

申请人： Kabushiki Kaisha Pilot Corporation (also trading as Pilot Corporation)

发明人： SANADA Yusuke ,  SERI Nobukazu ,  KAWARAZAKI Yuji ,  KAJIWARA Takumi ,  OONISHI Tomoharu

IPC分类号： B43K3/00 ,  B43K21/00 ,  B43K21/16

摘要： A mechanical pencil (10) has: a shaft tube (20); a ferrule unit (30) supported by the shaft tube (20); a lead holding unit (40) having a chuck (41) configured to relatively move with respect to the ferrule unit (30) to eject lead (LE) held by the same; and an indication body (70) provided movably in an axial direction (AD). The indication body (70) delimits from rearward a lead storage space (S) formed rearward the chuck (41) in the shaft tube (20). The indication body (70) located at least at a predetermined position is viewable from outside the shaft tube (20). A length (LA) along the axial direction (AD) between a rear end of the lead storage space (S) and a front end of the ferrule unit (30), in a state where the indication body (70) has moved most rearward along the axial direction (AD), is equal to or more than twice a length (LX) of spare lead (SLE) to be stored in the lead storage space (S).