Asymmetrical wafer configurations and method for creating the same
First Claim
Patent Images
1. A method of making a substantially thin rigid annular wafer, comprising the steps of:
- i. growing a substantially cylindrical crystal ingot;
ii. determining crystalline orientation of said substantially cylindrical crystal;
iii. grinding at least one orientation flat upon said substantially cylindrical crystal ingot;
iv. rounding at least one corner of said orientation flat that creates visual asymmetry in the wafer; and
,v. slicing said substantially cylindrical crystal ingot into a plurality of substantially annular wafers.
0 Assignments
0 Petitions
Accused Products
Abstract
The present invention consists of a method for imparting asymmetry to a truncated annular wafer by either rounding one corner of the orientation flat, or rounding one corner of a notch. This novel method of rounding corners impart a visual and/or tactile asymmetry which can be utilized by a person in order to differentiate between the two different sides of the wafer. This inventive wafer design and method for making an asymmetric wafer is especially useful in the field of semiconductor technology and may be used on sapphire crystal wafers or any other class of wafer.
103 Citations
10 Claims
-
1. A method of making a substantially thin rigid annular wafer, comprising the steps of:
-
i. growing a substantially cylindrical crystal ingot; ii. determining crystalline orientation of said substantially cylindrical crystal; iii. grinding at least one orientation flat upon said substantially cylindrical crystal ingot; iv. rounding at least one corner of said orientation flat that creates visual asymmetry in the wafer; and
,v. slicing said substantially cylindrical crystal ingot into a plurality of substantially annular wafers. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method of making a substantially circular-wafer, the method comprising the steps of:
-
i. growing a substantially cylindrical crystal ingot; ii, determining crystalline orientation of said substantially cylindrical crystal; iii. grinding at least one notch upon said substantially cylindrical crystal ingot; iv. rounding at least one corner of said notch in order to create visual asymmetry; and
,v. slicing said substantially cylindrical crystal ingot into substantially annular wafers. - View Dependent Claims (7, 8, 9, 10)
-
Specification