Tru-Si Technologies, Inc.

Frank E Kretz

Alexander Berger

Sean A Casarotti

An end-effector includes multiple vortex chucks for supporting a wafer. Vortex chucks are located along the periphery of the end-effector to help prevent a flexible wafer from curling. The end-effector has limiters to restrict the lateral movement of a supported wafer. In one example, the end-effector has a detector for detecting the presence of a wafer. The detector is mounted at a shallow angle to allow the end-effector to be positioned close to a wafer to be picked-up, thereby allowing detection of deformed wafers contained in a wafer cassette. The shallow angle of the detector also minimizes the thickness of the end-effector. Also disclosed is a wafer station with features similar to that of the end-effector.

Detection and handling of semiconductor wafers and wafers-like objects

An end effector has one or more vortex chucks to support a wafer, and at least two detectors for detecting different portions of the wafer before the wafer is picked up. If one of the detectors detects a wafer and the other one does not, an alarm is generated to alert an operator that the wafer is possibly cross slotted in the wafer cassette. Each detector includes a light emitter and a light receiver. The light emitter emits a light beam at an angle to a surface defined by an ideally flat wafer when the wafer is supported by the end effector (the actual wafers do not have to be flat). The angle is not more than 45&#xb0;, and is between 6&#xb0; and 12&#xb0; in some embodiments. Other features and embodiments are also provided.

Detection and handling of semiconductor wafers and wafer-like objects

A wafer or some other article is aligned while being held by an end-effector.

Alignment of semiconductor wafers and other articles

An article holder has sensors that detect whether an article held in the holder is a workpiece or a piece of packaging material. Examples are end effectors suitable for picking up semiconductor wafers and packaging material from a pod or some other carrier.

Article holders with sensors detecting a type of article held by the holder

An article holder has protrusions that contact the article. The friction between the protrusions and the article impedes the article movement relative to the holder yet allows the article to slide when the article is pushed against some object. The article is pushed against the object in order to position the article more precisely.

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Santa Clara, CA, United States of America

Frank E Kretz