Patent ID: 6847202

Claim:
An apparatus for recognizing a working position of a device transfer system for transferring semiconductor devices in a handler, comprising: a laser sensor configured to discharge a laser beam downward onto a base plate on which at least one of a tray and change kit are provided, and to output at least one signal corresponding to the location associated with the at least one of the tray and the change kit; a control unit configured to receive the at least one signal from the laser sensor and to determine a location of the at least one of the tray and the change kit with respect to the base plate based on the at least one signal output by the laser sensor; and a transfer unit configured to move toward the location determined for the at least one of the tray and the change kit, and to transfer the semiconductor device onto and remove the semiconductor devices from the at least one of the tray and the change kit, wherein the laser sensor is configured to be fixed to one side of the transfer unit.