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Description: Machines of the 7200CR Series provides separate functions on the same tool head to dispense epoxy, then to pick up chips, rotate them into alignment, and place them. All operation is controlled by West·Bond's unique three axis micromanipulator, working in combination with optical encoders under microprocessor control. The work piece is held on a free anvil work holder, where chips are also arrayed for pick up.
The dual tool assembly is driven directly by motor between the two positions for epoxy dispense and for vacuum pickup, with the transfer signaled by lift to a programmed elevation. Another programmed elevation is set to dispense epoxy without contact. This method is further enabled by the design of the "C Series" manipulator in which each axis is independently guided and therefore can be locked on command by pneumatic brake. Control of vacuum for pick up and placement is by work sensing firing switch, with down force adjustable from zero to approximately 75 grams. While the chip is held by vacuum, it can be rotated continuously by motor by an operator's optical encoder control.
All machine configuration constants are programmable at the machine panel, prompted by a series of "screens" displayed on a 4-line 40-character LCD. Execution is controlled by West·Bond Part No 8100 CPU containing a Motorola 68000 microprocessor and 256 KB of nonvolatile RAM. Entry of program values can be done by using for input either the encoder which reads tool position down from home, or the operator's rotation encoder. These values are displayed during bonding. To execute a manual override method, either the dispensing of epoxy or toggling of vacuum can be initiated at will by an operator's "Go" switch.
Dispense tool contains a 1 cc. reservoir for epoxy which may be filled through a screw cap access. Dispensing tube furnished as standard will be our P/N B-1831-1 which has a bore of 9.5 mils. An alternate dispense tube for large dots, or P/N B-1831-2 having a bore of 15.5 mils, may be substituted if specified. Pickup needle furnished as standard will be Gaiser P/N 3961-016-031-625 Delrin Series with "H" equal to .016" (hole diameter) and "T" equal to .031" (face diameter) and with OD equal to .0625" and length equal to .625", or equivalent. If any other pickup tool, either with different face dimensions or of collet style, is desired, then customer should order direct from tool manufacturer. This system has two tools for epoxy dispense and for die pick up and placement, with die rotation capability.
This system has the following option installed:
-79: Work Platform with Adjustable Height for variable package thickness. Adjusts through a range of 0.625-in., apportioned 0.094-in. above and 0.531-in. below the nominal elevation of 2.688-in. above the fixed platform surface. Assembly No. 8557 replaces No. 8273.
It includes a Nikon SMZ660 Microscope with a K-Sine Shadowless Illuminator.
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