Patent ID: 8858150
Filing Date: 2014-10-14
Classification: H01L

Abstract:
1. A door detection system for judging whether a door of a wafer carrier device is closed, comprising: a robot arm unit including at least one bearing platform and at least one level sensing structure disposed on the at least one bearing platform, wherein the level sensing structure includes a plurality of contact sensors, and the wafer carrier device is disposed on the at least one level sensing structure; and a movable unit including at least one movable structure disposed on the robot arm unit, wherein the wafer carrier device has a wafer pick-and-place opening corresponding to the door; wherein when the door of the wafer carrier device is closed, one end of the at least one movable structure contacts the door of the wafer carrier device and the bottom of the wafer carrier device simultaneously contacts all of the contact sensors; wherein when the door of the wafer carrier device is not closed, one end of the at least one movable structure is inserted into the wafer carrier device from the wafer pick-and-place opening and the bottom of the wafer carrier device simultaneously contacts some of the contact sensors.