Patent ID: 11935779
Assignee: SEMES CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A transfer hand for transferring a substrate comprising:
a body; and
a vacuum assembly installed at the body and configured to provide decompression to a bottom surface of the substrate to support the substrate at an upper surface of the body,
wherein the vacuum assembly includes,
a conductive vacuum pad configured to contact the substrate,
a sealing member between the vacuum pad and the body and electrically connected to the vacuum pad,
wherein the sealing member is configured to be grounded,
a current path to ground exists from the vacuum pad through the sealing member when the vacuum pad is not in contact with the body, the current path extending from the sealing member through the body when the vacuum pad is not in contact with the body,
the sealing member is provided as a material that has a resistance value smaller than a resistance value of the vacuum pad,
the body is provided as a material that has a resistance value smaller than the resistance value of the sealing member,
the vacuum pad includes,
a head portion containing the bottom surface of the substrate;
an insertion portion inserted in the body; and
a contact portion between the head portion and the insertion portion and contacting the sealing member, and the contact portion is provided in a curved shape, and

a radius of a curvature of the sealing member in a cross-section and a radius of a curvature of the contact portion in a cross section are the same along an entirety of the contact portion,
wherein the vacuum pad comprises:
a hole in communication with a vacuum line, the vacuum line being provided in the body and configured to provide decompression to the bottom surface of the substrate; and
a ring protrusion at an edge area of an upper surface of the vacuum pad,
wherein the vacuum pad comprises at least one support protrusion at the upper surface of the vacuum pad and placed inside the ring protrusion, the support protrusion is configured to transmit force to the substrate separating the substrate from the conductive vacuum pad, and

wherein the height of a top end of the support protrusion is lower than a height of a top end of the ring protrusion.