Method and means for locating process points on miniaturized circuits
First Claim
1. The method of locating rotationally displaced process points that have preassigned X and Y coordinate positions in an X, Y plane on an electronic device with the aid of a position identifier in the circumstance in which the identifier and the device are capable of relative motion parallel to said X, Y plane, which method includes the steps of:
- positioning and orienting the device and the identifier such that the identifier is aligned with a home position on the device;
measuring the amount of relative movement required in the X and the Y directions to move the indentifier from a position over the preassigned X and Y coordinates of a selected bonding point to a position over the actual position of that bonding point;
converting the measurement so made into a representation of the sine or tangent of the angle of rotational displacement; and
finding the position of another process point by adding to its preassigned X coordinate an X distance proportional to the product of the preassigned Y coordinate of said other process point and said representation, and by adding to the preassigned Y coordinate of said other bonding point a distance proportional to the product of the preassigned X coordinate of said other process point and said representation.
1 Assignment
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Accused Products
Abstract
A method and an apparatus is provided by which automatic or semi-automatic processing of integrated and printed circuit devices can be accomplished notwithstanding that the points at which processing must be accomplished have been displaced from their assigned positions by translation and rotation. The method involves measurement of displacement of some circuit points from their designated positions in a specified sequence. That is coupled with a physical positioning and orientation of the device relative to the process apparatus and with approximate calculation. An apparatus is disclosed by which the measurements, sequence of measurements, orientation, and computation required can be accomplished.
15 Citations
14 Claims
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1. The method of locating rotationally displaced process points that have preassigned X and Y coordinate positions in an X, Y plane on an electronic device with the aid of a position identifier in the circumstance in which the identifier and the device are capable of relative motion parallel to said X, Y plane, which method includes the steps of:
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positioning and orienting the device and the identifier such that the identifier is aligned with a home position on the device; measuring the amount of relative movement required in the X and the Y directions to move the indentifier from a position over the preassigned X and Y coordinates of a selected bonding point to a position over the actual position of that bonding point; converting the measurement so made into a representation of the sine or tangent of the angle of rotational displacement; and finding the position of another process point by adding to its preassigned X coordinate an X distance proportional to the product of the preassigned Y coordinate of said other process point and said representation, and by adding to the preassigned Y coordinate of said other bonding point a distance proportional to the product of the preassigned X coordinate of said other process point and said representation. - View Dependent Claims (2)
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3. In the process of moving a processing machine and a workpiece having a plurality of process points on its surface each of which has a preassigned X and Y coordinate position, which method comprises the steps of:
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positioning and orienting the device relative to the bonding tool such that the tool overlies a home position on said device; measuring the difference between the actual position of one of said process points and the position of the intersection of its preassigned X and Y coordinates in terms of X direction difference and Y direction difference; adding the difference in the X direction and the difference in the Y direction so found to the preassigned X and Y coordinates of a second process point to find a corrected, reassigned X and Y corrdinates for that second process point; and finding the difference between the actual position of said second process point and its reassigned X and Y coordinates. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10)
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11. For use with a wire bonding machine of the kind that includes a work point indicating means for indicating the work point at which the bonding tool will effect bonding on a workpiece and further includes means for producing relative movement in X and Y directions in the plane of said workpiece between the tool and workpiece automatically such that the tool is moved in predefined sequence to each of a number of process points on the workpiece the position of which process points is defined in terms of a home position on the workpiece:
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means for moving the workpiece relative to said work point to bring the point designated home position under the indicating means and for orienting the workpiece with its X direction parallel to said X direction of relative movement; means for moving the workpiece relative to said work point to place the assigned position of one of said process points under said work point; measuring means for measuring the displacement of said one process point from said work point; means for altering the preassigned position of a second one of said process points by the amount of said displacement; and means for measuring the displacement of said second one of said process points from its reassigned position. - View Dependent Claims (12, 13, 14)
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Specification