Patent ID: 9627238
Date: 2017-04-18
CPC Classifications: B65G,H01L

Claim:
1. A substrate transfer apparatus that unloads a substrate from a transfer container in which a cover body airtightly closes a substrate unloading opening formed at a front surface of a container main body and multiple substrates are accommodated in the form of shelves, the substrate transfer apparatus comprising: a load port to which the transfer container is loaded; a detection unit configured to detect an accommodation status including at least one of an inclination angle and a depth position of the substrate in the container main body that is loaded to the load port and separated from the cover body; a substrate transfer device configured to enter the container main body and unload the substrate; a control unit including a memory that stores at least one of a first tolerance range of the inclination angle of the substrate and a second tolerance range of the depth position of the substrate; and a correction device configured to correct the accommodation status of the substrate in the container main body before the substrate is unloaded from the container main body by the substrate transfer device when the detection unit detects abnormality in the accommodation status, wherein the control unit is configured to determine whether the inclination angle or the depth position of the substrate is out of the first tolerance range or the second tolerance range, and if the inclination angle or the depth position of the substrate is out of the first tolerance range or the second tolerance range, the control unit is configured to control the correction device to correct the accommodation status of the substrate, the correction device includes an opening/closing door configured to open and close a transfer opening for the substrate in the load port, and configured to engage the cover body with the container main body and separate the cover body from the container main body, the opening/closing door is configured to hold the cover body separated from the container main body and move the held cover body back and forth with respect to the substrate unloading opening of the container main body, and the accommodation status of the substrate is corrected by allowing the cover body held by the opening/closing door to push the substrate toward an inside of the container main body, and wherein the control unit is configured to control an operation of the opening/closing door and an operation of the substrate transfer device, when the number of substrates of which the accommodation status detected by the detection unit is abnormal is greater than a predetermined number, the control unit corrects the accommodation status in a lump by using the opening/closing door, and when the number of substrates of which the accommodation status detected by the detection unit is abnormal is equal to or smaller than the predetermined number, the control unit outputs a control signal to correct the accommodation status individually for each substrate by using the substrate transfer device.