Overview

This model series combines overhead ways and bond tools with the full 2400B Series software to locate and bond automatically a succession of line arrays on work pieces indexed along by customer’s conveyor. Bonding method can be either Single-Ball – "Ball in the Corner" – or Tab Bonding.

The Single-Ball method connects two traces, presented as a vee, by placing and then severing a ball from the end of a stock of fine gold wire. The Tab method makes connections, without wire, by ultrasonically bonding a metal tab from one trace to the metallization of a second trace. Typically for either method, there are several traces per device and several devices held front-to-back in carriers moved along by conveyor.

This machine follows a programmed path through a long range in "Y" direction, and a short range in "X", and automatically makes all the bonds of all the devices of each carrier in turn. It locates each target by Pattern Recognition and corrects for placement error. The machine is narrow in configuration and contains all mechanism overhead, providing greatest convenience in joining to work conveyors.

Programming of the work path makes use of the fully developed and richly featured software from West Bond’s Model 2400B running under Windows 98. Interface is by keypad, mouse, and large color display.

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 "Y" axis is moved via lead screw, and "X" and "Z", by linear spiral cams. A fourth motor drives the wire clamp assembly to sever wire and position it for ball formation by an air driven electronic torch wand. No motors are moved in "Z" direction to minimize inertia impact upon the bond. The vertical view video camera is moved on the "Y" axis at a measured offset to "X", and has sufficient field of view to scan the array of targets on that axis. In operation, coordinates of a next device are read while the previous device is being bonded. A microscope can be moved to view a large percentage of the bond range for setup verification.

The tool assembly is mounted on a four-bar linkage so the tool remains vertical and can be extended down to any position that tunes ultrasonically. In standard arrangement, the extended tool provides clearance of 0.28125 in. under the ultrasonic transducer stack, and 0.3750 in. everywhere else above the work plane. The standard set of force springs generates 10 to 250 grams, and together with the work-sensing firing switch, is built into the four-bar linkage. A dual force mechanism, operated pneumatically, acts to change between two pre-set force values, and either high or low force may be programmed for any bond.

Tool heads of this series are built around K~Sine Transducer, Model No. 24-W, one half wave in length, operating at a nominal frequency of 63 kHz. Actuation of all clamp motion is by the spiral cam of an inboard motor and is transferred through a linkage and ball bearing follower.

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 have any base or work platform. Mounting arms that descend to the table surface can be configured as required to join to customer’s mechanism.

A separate enclosure holds 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.

• Model No. 1700E. This machine with tool assembly No.6920 for Ball Bonding.
• Model No. 1708E. This machine with tool assembly No.6920 for Ball Bonding. ESD Protected
• Model No. 1750E. This machine with tool assembly No. 6748 for Tab Bonding.

Note: This Model Series was originally designated 3500E instead of 1700E

• Protective coating to protect against Electrostatic Discharge.
• Shielding method (Patent applied for) to prevent spark radiated damage.

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.

Machine size, exclusive of microscope and television monitor, is 11.813" wide x 23.938" deep x 13.625" high. Additional dimensions are shown on the drawings below. Weight is 75 lb. uncrated, or 110 lb. crated.