Apparatus and method for predetermined component placement to a target platform
The present invention relates generally to assembly techniques. According to the present invention, the alignment and probing techniques to improve the accuracy of component placement in assembly are described. More particularly, the invention includes methods and structures to detect and improve the component placement accuracy on a target platform by incorporating alignment marks on component and reference marks on target platform under various probing techniques. A set of sensors grouped in any array to form a multiple-sensor probe can detect the deviation of displaced components in assembly.
1. A method for placing a component on a target platform, the component having a contact array and the target platform having a land pattern, the method comprising:
providing one or more alignment marks associated with the contact array of the component;
providing one or more reference marks at predetermined spatial locations that match a spatial relationship for the one or more alignment marks, the one or more reference marks associated with the land pattern of the target platform;
storing in a placement equipment a relative displacement from a first one of the one or more alignment marks on the component to a reference point associated with the contact array of the component; and
detecting by the placement equipment a central coordinate of a central point of a probe that is aligned to one of the reference marks;
wherein the component is placed at a location determined by the central coordinate adjusted by the relative displacement.
2. The method of claim 1 wherein the probe includes a multiple-sensor probe.
3. The method of claim 1 wherein the component includes an integrated circuit device.
4. The method of claim 1 wherein the component includes a bare die.
5. The method of claim 1 wherein the component includes a packaged chip.
6. The method of claim 1 wherein the component includes a stacked device.
7. The method of claim 1 wherein the component includes an integrated circuit device laminated with an anisotropic conductive membrane.
8. The method of claim 1 wherein the detecting includes sensing with an optical sensing path.
9. The method of claim 1 wherein the detecting includes sensing with a capacitance probe.
10. The method of claim 1 wherein the detecting includes sensing with a conductive signal path.
11. The method of claim 1 wherein the relative displacement is zero and a position of the first one of the one or more alignment marks is the reference point.
12. A method for placing a component on a target platform, the component having a contact array and the target platform having a land pattern, the method comprising:
providing one or more alignment marks associated with the contact array of the component;
providing one or more reference marks at predetermined spatial locations that match a spatial relationship for the one or more alignment marks, the one or more reference marks associated with the land pattern of the target platform;
detecting a position of the one or more reference marks on the target platform by a sensor probe;
placing the component at a coordinate by using information stored in a placement database; and
aligning the one or more alignment marks with respect to the one or more reference marks to accurately place the component on the target platform; and wherein the sensor probe is a multiple sensor probe.
13. The method of claim 12 , wherein the position of the one or more reference marks is at a center of one of the one or more reference marks.
14. The method of claim 12 , wherein detecting includes determining a deviation from a center of one of the one or more reference marks to a center of the sensor probe.
15. The method of claim 12 further comprising fixing a component placement displacement error with respect to the target platform.
16. The method of claim 12 further comprising fixing a component placement orientation error with respect to the target platform.
17. The method of claim 12 , wherein the one or more alignment marks is a contact point of the contact array on a surface of the component.
18. The method of claim 12 , wherein the one or more reference marks is a contact point of the land pattern on the target platform.
19. The method of claim 12 , wherein the component is a bare die and the target platform is a bare die.
20. The method of claim 12 , wherein the component is an integrated circuit the target platform is an integrated circuit.
21. The method of claim 12 , wherein the component is a packaged device and the target platform is a printed circuit board.
22. The method of claim 12 further comprising recording the position in an electronic circuit coupled to the probe.