Patent ID: 9184080
Filing Date: 2015-11-10
Classification: H01L

Abstract:
1. A substrate transfer apparatus, comprising: a substrate transfer device configured to load and unload a plurality of substrates into and from a cassette configured to accommodate the plurality of substrates; a substrate detector device configured to detect positions of the substrates accommodated in the cassette; and a control device configured to control the substrate transfer device, wherein the control device includes a computation component configured to calculate a shifted amount between a base position and the position of each of the substrates detected by the substrate detector device such that the shifted amount of an upward or downward shift from the base position is set as a positive value, a verification component configured to verify whether a difference between maximum and minimum values among the shifted amounts calculated by the computation component is equal to or less than a threshold value, and a transfer control component configured to control the substrate transfer device such that the substrate transfer device unloads the substrates from the cassette when the verification component verifies that the difference between the maximum and minimum values is equal to or less than the threshold value.