US 11,728,106 B2
Keyboard key device
Chih-Hsien Wu, Taichung (TW); Shih-Pin Lin, Taichung (TW); Li-Ling Huang, Taichung (TW); and Hsiang-Yi Chen, Taichung (TW)
Assigned to Sunrex Technology Corp., Taichung (TW)
Filed by SUNREX TECHNOLOGY CORP., Taichung (TW)
Filed on Jul. 27, 2021, as Appl. No. 17/443,660.
Claims priority of application No. 110108355 (TW), filed on Mar. 9, 2021.
Prior Publication US 2022/0293356 A1, Sep. 15, 2022
Int. Cl. H01H 13/02 (2006.01); H01H 13/14 (2006.01); F21V 8/00 (2006.01); H01H 13/20 (2006.01)
CPC H01H 13/023 (2013.01) [G02B 6/0036 (2013.01); G02B 6/0091 (2013.01); H01H 13/14 (2013.01); H01H 13/20 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A keyboard key device comprising:
a keycap having a main body part that is not light-transmissive, a primary character part that is connected to said main body part and that is light-transmissive, and at least one secondary character part that is connected to said main body part and that is light-transmissive, such that light rays irradiated to one side of said keycap are allowed to transmit through said primary character part and said at least one secondary character part to another side of said keycap;
a substrate unit, said substrate unit and said keycap being arranged in an axial direction, said substrate unit including
a circuit board,
a light-emitting component that projects from said circuit board toward said keycap,
a light guide plate that is disposed at a side of said circuit board facing said keycap, and that has
opposite first and second end surfaces being respectively proximate to and distal from said circuit board, said first end surface being formed with an uneven internal microstructure for diffuse reflection of light rays,
a through hole extending through said first and second end surfaces, said light-emitting component extending into said through hole, said primary character part of said keycap and said through hole being aligned with each other in said axial direction, and
at least one light-condensing hole, said at least one second character part of said keycap and said at least one light-condensing hole being aligned with each other in said axial direction, and
a light transmission plate that is disposed at a side of said light guide plate facing said keycap, and that has
opposite first and second side surfaces being respectively proximate to and distal from said light guide plate, and
an outer reflective layer made of a reflective material and coated on said second side surface, such that a portion of light rays which are emitted from said light-emitting component and into said light transmission plate pass through said outer reflective layer, and that a remainder of said light rays are reflected by said outer reflective layer to propagate into said light guide plate to said microstructure of said first end surface; and
a support unit extending in said axial direction and interconnecting said keycap and said substrate unit such that said keycap is movable relative to said substrate unit.