US 12,282,615 B2
Passive capactive stylus and eraser cap
Chin-Fu Chang, Taipei (TW); Shang-Tai Yeh, Taipei (TW); Hsueh-Fen Lin, Taipei (TW); and Yu-Cing Lien, Taipei (TW)
Assigned to EGALAX_EMPIA TECHNOLOGY INC., Taipei (TW)
Filed by EGALAX_EMPIA TECHNOLOGY INC., Taipei (TW)
Filed on Dec. 15, 2023, as Appl. No. 18/541,394.
Claims priority of application No. 112124804 (TW), filed on Jul. 3, 2023.
Prior Publication US 2025/0013321 A1, Jan. 9, 2025
Int. Cl. G06F 3/0354 (2013.01); G06F 3/044 (2006.01)
CPC G06F 3/03545 (2013.01) [G06F 3/044 (2013.01); G06F 3/0445 (2019.05); G06F 3/0446 (2019.05)] 12 Claims
OG exemplary drawing
 
1. A passive capacitive stylus, comprising:
a body, made of non-conductive material, comprises an internal space, wherein two ends of the body comprises a first open and a second open, respectively, a longest first line inside the first open perpendicular to a central axis of the body is shorter than a longest space line inside the internal space perpendicular to the central axis, a longest second line inside the second open perpendicular to the central axis of the body is shorter than the longest space line;
a conductor disposed inside the internal space, wherein the conductor comprises conductive foam;
a first head made of conductive material and disposed inside the first open and being protruded outside the body in a first direction of the central axis, the first head is in contact with the conductor; and
a second head made of conductive material and disposed inside the second open and being protruded outside the body in a second direction of the central axis, the second head is in contact with the conductor.