Overview

Year 2000 saw the "C" Series finally replace the venerable "A" Series, and now witnesses the transition from "C" to "D". The "C" Series brought forth improvements to the core X-Y-Z manipulator – independently guided and locked axes – but retained the "A" Series tool assembly. Now "D" Series brings across the revolutionary "E" wire clamps and groups them with their drive motor and a full wavelength transducer on a new tool assembly pivoted as before. The X-Y-Z follower mechanism has improved linear ways and accepts the new tool assemblies of the wire bonders as well as other cast-body tool assemblies.

The ball-wedge wire bond configuration is shown below.

Machines of this series bond gold wires ranging from 0.0007 in. to 0.002 in. Bonds are made by the ball-to-wedge technique using ultrasonic energy and work piece heat. Wire is clamped and threaded vertically through a hollow capillary, allowing independent feeding action. The connection is begun with a ball formed on the end of the wire stock by electric discharge, and completed by a wedge bond under the end of the capillary tool. The operator using hand/eye reference to bond targets and elevations guides the bonding tool manually.

The all-new tool assembly of this series features wire clamps brought over from "E" Series. The clamps are air-opened and spring-closed, and have a self-contained closure pivot. A separate pivot generates the clamp feed motion. Alignment of clamps to the tool is facilitated by individual adjustments along three axes. Actuation of all clamp motion is by the same spiral cam of an onboard motor. Appropriate clamp motion settings are configured in software and are retained in non-volatile memory.

The ultrasonic transducer is K~Sine Model K~77D-C, 1½ wavelength, operating at a nominal frequency of 63 Khz and with capillary length of 0.625-in. extended 0.531-in. below center. Ultrasonic power supply is K~Sine built-in, five Watts, dual channel.

Two values of bond force in the overall range of 18 to 90 grams are adjusted at the tool assembly as two preset positions of a compression spring. Either high or low force setting can be programmed for each bond. Initiation of bonding is upon the opening of the firing switch. The elevation at which to feed wire and to stroke the torch wand for ball formation is measured from each bond by an optical encoder on the Z Axis.

Protection against Electrostatic Discharge is implemented by finishing exposed tool assemblies and other moving parts by Electroless Nickel plating, which is conductive; and all exposed painted parts with a powder-coated paint that is dissipative.

Control of machine logic, motor motions, and Ultrasonic energy is programmed to and executed by West·Bond Part No 8100 CPU containing a Motorola 68000 microprocessor and 256 KB of nonvolatile RAM. All machine configuration constants and bond settings are programmable at the machine panel, prompted by a series of "screens" displayed on a 4-line 40-character LCD. Three separate buffers of bond settings for a wire type can be entered and selected during bonding by a selector switch. Each wire type can have one, two, or three stitch bonds; each with its own settings of ultrasonic power, and time. All programmed values are displayed during bonding. At "home", various options are enabled.

To form precisely sized balls, the motor-controlled spiral cam drives the clamps to feed an exact new length, and a controlled quantity of electrical energy is discharged to the free wire end.

• Model No. 7700D. This machine described herein.

• Feature No. 79. Adjustable height work platform.

The microscope recommended for this series is Nikon SMZ660 with the "Luxuray" LED No. 10265.01 illuminator. Neither microscope nor illuminator are included. One recommended bonding tool is included.

Compressed air, regulated to 50 psig, is required. Connection is via 1/4-inch tubing.

Electrical service required is 100-120 VAC, 50-60 Hz, 2 Amps. For 200-240 VAC, an external step-down transformer is required which must be secured by end-user as electrical codes vary from country to country.

Machine size is 22" deep X 19" wide X 12" high, exclusive of microscope, or 18" in height to scope eyepieces. Weight is 60 lb. uncrated, or 95 lb. crated.