Patent ID: 11862411
Assignee: PRIMAX ELECTRONICS LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A keyboard device comprising plural key structures, each of the plural key structures comprising:
a keycap;
a base plate located under the keycap;
an elastic element arranged between the keycap and the base plate;
a connecting member arranged between the keycap and the base plate; and
a membrane circuit board arranged between the elastic element and the base plate, wherein the membrane circuit board comprises:
a first membrane substrate comprising a first gas channel and a first conductive contact, wherein the first conductive contact is aligned with the first gas channel;
a spacer substrate located under the first membrane substrate, and comprising a first gas hole and a second gas hole, wherein the first gas channel is in communication with the first gas hole and the second gas hole;
a second membrane substrate located under the spacer substrate, and comprising a second gas channel, a second conductive contact, a third gas hole and a fourth gas hole, wherein the second conductive contact is aligned with the second gas channel, the second gas channel is communication with the third gas hole and the fourth gas hole, and the second gas channel is in communication with the first gas channel through the first gas hole and the second gas hole; and
a third membrane substrate located under the second membrane substrate, and comprising a third gas channel, wherein the third gas channel is in communication with the second gas channel through the third gas hole and the fourth gas hole.