公开(公告)号：US11914832B2

公开(公告)日：2024-02-27

申请号：US17953587

申请日：2022-09-27

申请人： TONG LUNG METAL INDUSTRY CO., LTD.

发明人： Pai-Hsiang Chuang ,  Ruei-Jie Jeng ,  Chen-Ming Lin ,  Ding-Sian Cai ,  Chun-Yi Fang

IPC分类号： G06F3/045

CPC分类号： G06F3/045 ,  G06F2203/04103

摘要： A membrane touch panel device includes a circuit board unit, a light-blocking frame plate, a plurality of light-blocking tabs, and an operation panel unit that are stacked along a front-rear direction. The circuit board unit includes a circuit board having a plurality of keypad circuits, and a plurality of LEDs being electrically connected to the circuit board. A light transmission rate of the circuit board ranges from 0% to 20%. The light-blocking frame plate is stacked on the circuit board, and defines a hollow section provided for the LEDs to protrude thereinto. The light-blocking tabs are connected to the light-blocking frame plate such that the light-blocking tabs respectively cover the LEDs. The operation panel unit is stacked on the light-blocking frame plate, and has a plurality of key segments being respectively aligned with the keypad circuits, and being adapted to permit light generated by the LEDs to pass therethrough.