US 2025/0063655 A1Published application

Membrane circuit board

AssigneePrimax Electronics Ltd.

InventorsLei-Lung Tsai, Che-An Li

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Abstract

A membrane circuit board is provided, which has at least one switch region. The membrane circuit board includes first and second membranes, a spacer layer, a first carbon ink contact, and a corresponding contact. The second membrane is located over the first membrane. The spacer layer is located between the first and second membranes, and has an opening in the switch region. The first carbon ink contact is disposed on one of a portion of an upper surface of the first membrane corresponding to the opening and a portion of a lower surface of the second membrane corresponding thereto. The corresponding contact corresponds to the first carbon ink contact, and is disposed on the other thereof. The corresponding contact is a second carbon ink contact or a conductive contact, and resistance of the conductive contact is less than resistance of the first carbon ink contact.

Claims10

Dependent claims

A membrane circuit board, having at least one switch region, the membrane circuit board comprising:

a first membrane;
a second membrane, located over the first membrane;
a spacer layer, located between the first membrane and the second membrane, and having an opening in the at least one switch region;
a first carbon ink contact, disposed on one of a portion of an upper surface of the first membrane corresponding to the opening and a portion of a lower surface of the second membrane corresponding to the opening;
and
a corresponding contact, corresponding to the first carbon ink contact, and disposed on the other of the portion of the upper surface of the first membrane corresponding to the opening and the portion of the lower surface of the second membrane corresponding to the opening, wherein the corresponding contact is a second carbon ink contact or a conductive contact, and resistance of the conductive contact is smaller than resistance of the first carbon ink contact.

3 more elements

Dependencies are inferred from the claim text.