Pre-aligner search
View Patent ↗Methods and systems, in one embodiment, for receiving a warped flexible wafer to be transferred between a first mechanism and a second mechanism are described. The method and system senses a first vacuum suction between the warped flexible wafer and the first mechanism. The warped flexible wafer is positioned to define a gap between the warped flexible wafer and the second mechanism. Methods and systems for closing the gap incrementally between the warped flexible wafer and the second mechanism are described. At each increment, the methods and systems detect whether a second vacuum suction is created between the warped flexible wafer and the second mechanism. When a second vacuum suction is detected between the warped flexible wafer and the second mechanism, the first vacuum suction between the warped flexible wafer and the first mechanism is released.
1. A method comprising:
receiving a warped flexible wafer to be transferred between a first mechanism and a second mechanism;
sensing a first vacuum suction between the warped flexible wafer and the first mechanism;
positioning the warped flexible wafer in a position defining a gap between the warped flexible wafer and the second mechanism;
closing the gap over a set of two or more increments between the warped flexible wafer and the second mechanism, wherein each of the increments is less than the gap;
detecting, at each increment in the set of increments, whether a second vacuum suction is created between the warped flexible wafer and the second mechanism; and
releasing the first vacuum suction between the warped flexible wafer and the first mechanism when a second vacuum suction is detected between the warped flexible wafer and the second mechanism.
2. The method of claim 1 , wherein the first mechanism is a transfer arm and the second mechanism is a pre-aligning chuck, wherein a compliance in the warped flexible wafer allows a transfer between the transfer arm and the pre-aligning chuck mechanism to occur without damaging the warped flexible wafer.
3. The method of claim 1 , wherein the first mechanism is a pre-aligning chuck and the second mechanism is a transfer arm, wherein a compliance in the warped flexible wafer allows a transfer between the transfer arm and the pre-aligning chuck mechanism to occur without damaging the warped flexible wafer.
4. The method of claim 1 , wherein closing the gap includes moving the first mechanism, the second mechanism, or both.
5. The method of claim 4 , wherein the moving includes incremental movements of about 5 mils.
6. The method of claim 2 , further comprising flattening the warped flexible wafer on a surface of the pre-aligning chuck that is configured to rotate the flexible wafer to a pre-aligned position.
7. The method of claim 6 , further comprising transferring the pre-aligned flexible wafer from the pre-aligning chuck to a test position to allow probing of the flexible wafer.
8. The method of claim 3 , further comprising transferring the warped flexible wafer from the transfer arm to a storage position.
9. The method of claim 1 , wherein the compliance of the warped flexible wafer during transfer from the first mechanism to the second mechanism allows for at least 1 mm of flexing to occur with the warped flexible wafer without causing damage to the warped flexible wafer.
10. The method of claim 1 , wherein the warped flexible wafer has 1 to 12 mm of warping.
11. A machine readable medium having stored thereon data representing sequences of instructions, which when executed by a computer system cause the computer system to perform a method comprising:
receiving a warped flexible wafer to be transferred between a first mechanism and a second mechanism;
sensing a first vacuum suction between the warped flexible wafer and the first mechanism;
positioning the warped flexible wafer in a position defining a gap between the warped flexible wafer and the second mechanism;
closing the gap over a set of two or more increments between the warped flexible wafer and the second mechanism, wherein each of the increments is less than the gap;
detecting, at each increment in the set of increments, whether a second vacuum suction is created between the warped flexible wafer and the second mechanism; and
releasing the first vacuum suction between the warped flexible wafer and the first mechanism when a second vacuum suction is detected between the warped flexible wafer and the second mechanism.
12. The machine readable medium of claim 11 , wherein the first mechanism is a transfer arm and the second mechanism is a pre-aligning chuck, wherein a compliance in the warped flexible wafer allows a transfer between the transfer arm and the pre-aligning chuck mechanism to occur without damaging the warped flexible wafer.
13. The machine readable medium of claim 11 , wherein the first mechanism is a pre-aligning chuck and the second mechanism is a transfer arm, wherein a compliance in the warped flexible wafer allows a transfer between the transfer arm and the pre-aligning chuck mechanism to occur without damaging the warped flexible wafer.
14. The machine readable medium of claim 11 , wherein closing the gap includes moving the first mechanism, the second mechanism, or both.
15. The machine readable medium of claim 14 , wherein the moving includes incremental movements of about 5 mils.
16. The machine readable medium of claim 11 , wherein the compliance of the warped flexible wafer during transfer from the first mechanism to the second mechanism allows for at least 1 mm of flexing to occur with the warped flexible wafer without causing damage to the warped flexible wafer.
17. A system comprising:
a base;
a first mechanism supported by the base and configured to engage a warped flexible wafer with a first vacuum suction;
a second mechanism supported by the base and configured to engage the warped flexible wafer with a second vacuum suction and to receive the warped flexible wafer from the first mechanism;
at least one sensor coupled with the first and second mechanism, the at least one sensor being configured to determine whether the warped flexible wafer is engaged with a respective mechanism after a gap is closed over a set of two or more increments between the first and second mechanism, wherein each of the increments is less than the gap; and
a control system coupled with the at least one sensor, the control system being configured to receive information at each increment, in the set of increments, from the at least one sensor and to determine whether to release the first vacuum suction between the warped flexible wafer and the first mechanism when a second vacuum suction is detected between the warped flexible wafer and the second mechanism.
18. The system of claim 17 , wherein the first mechanism is a transfer arm and the second mechanism is a pre-aligning chuck, wherein a compliance in the warped flexible wafer allows a transfer between the transfer arm and the pre-aligning chuck mechanism to occur without damaging the warped flexible wafer.
19. The system of claim 17 , wherein the first mechanism is a pre-aligning chuck and the second mechanism is a transfer arm, wherein a compliance in the warped flexible wafer allows a transfer between the transfer arm and the pre-aligning chuck mechanism to occur without damaging the warped flexible wafer.
20. The system of claim 17 , wherein closing the gap includes moving the first mechanism, the second mechanism, or both.