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Model 3700E Series, Automatic, Gantry, Large Area Ball
Bonders
Last revised: 4/18/2003
Overview
Model 3700E is a gantry with overhead ways and a moving bond
head that brings the bonding function to the work and leaves
the material handling process flow under customer control. It
uses the full 2700B Series software to locate and bond automatically
fine wire connections arrayed over a large, stationary work
piece. There is no limit to the size of the work as this machine
is entirely above the bond plane. The area traversed for bonding
is six by nine and one-eighth inches; and successive areas could
be presented. Bonding of fine Gold wire is by the ball and wedge
method, allowing connections in all directions, but requiring
work piece heat.
This machine follows a programmed path to all the targets across
the bond area; locating each target by Pattern Recognition and
correcting for placement error. Programming of the work path
makes use of the fully developed and richly featured software
from West Bond’s Model 2700B running under Windows. Interface
is by keypad, mouse, and large LCD color display.
Mechanical
Bonding mechanism is constructed of three axes, straight-line
and orthogonal, all driven by stepper motors in micro-step mode
under program control. The long "X" and "Y"
axes are
moved via lead screw, and the "Z", by a linear spiral
cam. A fourth motor drives the television camera assembly in
"Z" direction for focus; and a fifth, sets force for
each bond by varying the initial compression of a force counterbalance
spring. Wire is fed from a spin-off 2-inch spool mount down
through the capillary tool. A negative EFO torch wand at the
home elevation is solenoid-driven into position to form balls.
All movement ways are hardened and ground vees with crossed
rollers. The lead screws are positioned outside the ways, so
to be accessed for maintenance without disassembly. Fine accuracy
is assured by closed-loop feedback to the motor controls from
an optical encoder system with glass scales and laser sensors
mounted within the X- and Y-Axes.
Ranges, Ratios and Resolutions
| Bond "Y" |
Range
Resolution |
5.375 inches (plus offset)
0.0001 inch per encoder division |
| Bond "X" |
Range
Resolution |
9.500 inches
0.0001 inch per encoder division |
| Bond "Z" |
Range
Resolution |
0.500 inch
0.0001 inch per motor micro-step |
| Offset "Y" |
Distance |
0.625 inch, making total "Y" range, 6.0 inches. |
Note that nominal work elevation is 5.000 inches above the table
surface, and that in all configurations the tool descends at
maximum range to 4.875 inches, an over travel of 0.125 inch.
The adjustable work platform has a vertical range of 0.625 inch
to set actual work contact elevation.
Bond Tool Head Assembly
The bond head transducer and wire clamps depend from the "Z"
axis slide by a four-bar linkage to keep the tool vertical and
extendable to any position that tunes ultrasonically, and to
reduce mass on the bond. In standard arrangement, a 0.750-in.
capillary, dropped 0.656-in. below center, provides clearance
of 0.406-in. above the work plane for work piece package walls.
Overhead wire clamps, air-opened and spring-closed, are standard
throughout the D- and E-Series. They are actuated during the
lift stroke to feed a wire length for balling. The negative
EFO torch is driven at the home position to form the ball: Therefore,
for ball bonding, it is this position that defines the bond
stroke rather that the lower work position, and work elevation
must be adjusted to control stroke length.
Bond Force is set to program values by a motor with spiral cam
that adjusts the initial compression of the force spring. This
force is opposed by a constant spring that serves to hold closed
firing switch contacts until bond contact.
The Tool Head of this series is built around K~Sine Transducer,
Model No. 27-EC, one half wave in length, operating at a nominal
frequency of 63 kHz. Radiant tool heat with constant current
control is included.
Machine Configuration
The mechanism of this series was designed to mount above a customer's
work handling system, to be confined entirely above the work
plane, and so not to require any base or work platform: Custom
mounting brackets can be designed to join to customer’s mechanism.
This configuration is designated by the appended "X",
as Model 3700EX. For tabletop application, the standard model
of this Series, Model 3700E, is without any work holder or temperature
controller. The floor-standing configuration becomes Model 3700E-90
by the addition of Feature ?90, Frame. In any configuration,
the Industrial Computer CPU Chassis and West?Bond’s Power Supply
Chassis are housed as separate components.
A motorized Wire De-spooler, Assy No 10055, for 2-inch spools,
and which also includes side-view Television Camera Assy No
10010 with Polaris Model No. MB-1250 Camera, is mounted on the
Y-Axis.
A utility to detect failure of ball formation is included, so
to halt immediately to prevent damage to subsequent bond sites.
ESD protected Olympus Model SZ3060E Microscope with 15X eyepieces
and the new LED illuminator "Luxuray" are included.
No other microscope has equivalent clearance to bond head. This
microscope is mounted on a folded linkage that allows it to
be positioned to view most of the bond area.
Electrical Software and Hardware
A software control program, well developed and in long use for
West Bond Model No. 2700B, is adapted to serve this model as
well. This program runs under Windows and is executed by a Pentium
III processor housed in an Industrial CPU enclosure. Pattern
Recognition is accomplished by Matrox components. The User Interface
is displayed on a large LCD color display, and consists of many
screen forms that also include a display of the work piece targets.
Input controls require a mouse, a keypad and a control-switch
pad. User data of machine configuration, and of device targets
and image patterns, can be saved to 100MB Zip discs.
The separate power supply enclosure holds motor and logic electrical
power supplies, and also K~Sine Part No 6795, four Watts, dual
channel ultrasonic power supply. Settings of power and time
program values are sent via an eight-bit interface.
ESD Protection
Protection against Electrostatic Discharge is implemented by
finishing exposed tool assemblies and other moving parts by
Electro less Nickel plating, which is conductive; and all exposed
painted parts with a powder-coated paint that is dissipative.
Definitions of Models of this Series:
◆ Model No. 3700E. This machine with tool assembly
No. 9765 for Ball Bonding at ultrasonic frequency of 63 kHz.
There are no optional Features.
◆ Model No. 3700E-90. This
machine for 63 Khz, including Feature ?90, Floor-Standing Frame.
◆ Model No. 3700EX. This machine
for 63 Khz, but less Base, Adjustable Platform, and Work Holder.
◆ Model No. 3730E. This machine
with tool assembly No. 9774 for Ball Bonding at ultrasonic frequency
of 110 kHz. There are no optional Features.
◆ Model No. 3730E-90. This
machine for 110 Khz, including Feature ?90, Floor-Standing Frame.
◆ Model No. 3730EX. This machine
for 110 Khz, but less Base, Adjustable Platform, and Work Holder.
Features and Accessories Available for this Series:
◆ Feature No. -79 Adjustable
Height Work Platform.
◆ Product No. -3KNR.01 Large-Area
Heated Work Station with drop-in work piece adapter, and with
K~Sine Model No. K~1200D Temperature Controller. Requires addition
of Feature ?79.
Services
Compressed air, regulated to 50 psig, is required. Connection
is via 1/4-inch tubing.
Electrical service required is 50-60 Hz, single phase, either
115 VAC or 230 VAC; however, input must be configured at the
factory for 230 VAC. A fuse and three-prong power cord connector
are provided for 115 VAC: For 230 VAC, these must be changed
to conform to local requirements.
Dimensions
Machine dimensions are shown on the drawings below.
Weight is 100 lb. uncrated, or 140 lb. crated.
Side View
End View
Model No. 3700E-90
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