Ultra low contact area end effector
First Claim
Patent Images
1. An end effector for transporting semiconductor workpieces, comprising:
- a low-profile body having a proximal end and a distal end, said distal end including a recessed pocket in fluid communication with a vacuum channel passing through a portion of said low-profile body, said recessed pocket having a pivot socket;
a support pad having a central portion with a spherically-shaped bottom surface and a top surface including an elevated contact ridge, said central portion having a vacuum passage extending through, said support pad seated on said pivot socket forming a ball-and-socket joint between said pivot socket and said central portion of said support pad; and
a retaining device removably affixed to a portion of said recessed pocket for limiting the motion of said support pad.
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Abstract
The present invention comprises a vacuum end effector having workpiece supports that work in conjunction with distorted workpiece surfaces. In one embodiment, each workpiece support has the ability to gimbal and conform the workpiece surface in contact with an outer edge of the support. Each workpiece support preferably provides a knife-like contact edge to minimize the contact area between the support and the workpiece while still providing an effective vacuum area to hold the wafer securely on the support. In another embodiment, each workpiece support is replaceable without having to remove the end effector from the robot assembly
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Citations
19 Claims
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1. An end effector for transporting semiconductor workpieces, comprising:
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a low-profile body having a proximal end and a distal end, said distal end including a recessed pocket in fluid communication with a vacuum channel passing through a portion of said low-profile body, said recessed pocket having a pivot socket; a support pad having a central portion with a spherically-shaped bottom surface and a top surface including an elevated contact ridge, said central portion having a vacuum passage extending through, said support pad seated on said pivot socket forming a ball-and-socket joint between said pivot socket and said central portion of said support pad; and a retaining device removably affixed to a portion of said recessed pocket for limiting the motion of said support pad. - View Dependent Claims (2, 3, 4)
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5. An end effector for transporting semiconductor workpieces, comprising:
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a low-profile body having a top surface and a distal end forming a first finger and a second finger, said first and second fingers each having a recessed pocket having a bottom surface with an opening to a vacuum passage that travels through a portion of said low-profile body; a pivot socket located within each one of said recessed areas, each pivot socket having a central opening for allowing gas to travel between said vacuum passage and said recessed pocket; a wafer support having a top surface with a raised contact edge for contacting a bottom surface of a workpiece and a central portion having a spherically-shaped bottom surface adapted to sit in said pivot socket and form a ball-and-socket joint; and a retaining device for limiting the motion of said wafer support. - View Dependent Claims (6, 7, 8, 9)
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10. An end effector for transporting wafers, comprising:
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a body having a top surface and a distal end forming a first elongated finger and a second elongated finger, each said finger having a recessed pocket with an opening in a bottom surface of said recessed pocket that is in fluid communication with a vacuum passage traveling through a portion of said body; a support pad located within each said recessed pocket, said support pad adapted to form a ball-and-socket joint with said opening in said recessed pocket; and a retaining ring for retaining said support pad within said recessed pocket and limiting the motion of said support pad. - View Dependent Claims (11, 12, 13)
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14. An end effector for transporting workpieces, comprising:
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a body having a vacuum passage extending from a proximal end to a distal end, said distal end forming a first elongated finger and a second elongated finger, said first and second fingers each having a recessed pocket that includes a bottom surface with an opening to provide a passageway between said recessed pocket and said vacuum passage; a chuck seated in each said recessed pocket, each said chuck having a central body portion with a vacuum channel extending through and a top portion that extends outward from said central body portion, said central body portion adapted to form a ball-and-socket joint with said opening and said top portion adapted to contact a bottom surface of a workpiece seated on said chuck; and a retaining device located in each said recessed pocket for retaining said chuck within said recessed pocket. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification