DE35-ST Operating Instructions
D292469I
101
Wafer Holders
The DE35 ST Wafer Holders are available for both expanding and non-expanding film
holders for all current film frames or rings, handling up to 8-inch wafers.
Expanding Wafer Holders are designed to stretch the tape mounting the wafer to make
the die easier to pick by loosening the adhesive and widening the streets between the
die. Expandable film is available in both UV release tape and Nitto tape. When working
with fragile die, the preferred tape is UV release for the least adhesiveness and ease of
picking.
The down side of Expanding Holders is the distortion in the tape from stretching which
can create a slight bow in the streets between the die. This slight curving will cause a
skewing of the die being picked from one end of the wafer to the other.
Non-Expandable Wafer Holders do not expand the film when put onto the machine.
These are normally used where the wafer is sawn leaving wide kerfs between rows of
die for ease of picking. With no stretching there is no distortion of the tape meaning
less skew in the die when picking.
Wafer Holder Interlock
All wafer holders are equipped with a Wafer Holder Interlock System. This system is
used to help prevent accidentally jamming the arm against an open Wafer Holder.
When the Wafer Holder is opened, a lever on top of the holder releases the Interlock
Switch if the arm is activated. Three beeps are heard, and the LCD displays
FRAME
HOLDER OPEN, PLEASE CLOSE TO CONTINUE
. After the wafer holder has been closed,
the LCD will read,
TO RESUME, PRESS THE (YES) KEY; TO ABORT, PRESS THE (NO) KEY
.
When the
Yes/No
keys are pressed, the arm will move. When
Yes
is pressed, the arm
will finish the cycle. When
No
is pressed, the arm will move to the rest position.
The Activating Lever may need to be adjusted when changing Film Holders out. To
adjust: loosen Cap Screw, adjust as needed, and then tighten Cap Screw. When
adjusted properly, an audible click can be heard as the Frame Holder is closed and
latched.
Summary of Contents for Royce DE35-ST
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