Model 4500B Series, Wedge-Wedge Wire Bonders

1551 Gene Autry Way, . Anaheim, CA 92805
Phone: 714.978.1551 . . . Fax: 714.978.0431

Specifications: Model 4500B Series, Wedge-Wedge Wire Bonders Last Revised: 4/1/2000

Note: All models of this Series have Status "AvailableNotStocked" as of April 1, 2000

Model 4500B operates under microprocessor control with user-programmed memory to stitch bond a succession of parallel multi-arch wires, requiring an operator only to position the critical bond target. Each increment of motion of tool and work in both Z and Y directions is executed by stepper motors under program control so that the resulting wire connections have identical shapes. This is ideal for bonding high power, high frequency devices where it is necessary to hold the mutual inductance of parallel wires constant.

All machine operation is controlled by a software program which resides in PROM and executes through a 16-bit microprocessor. Data of customer's devices is stored in RAM and is held during power-off by battery backup. This data is entered into memory directly from an alpha-numeric keypad in response to prompts displayed on a 4-line 40-character LCD. A sequence of screens leads the operator through the steps of entering and editing data at learn time, and provides information to prompt operator actions at run time. Machine status and program data is displayed at each event.

The machine is designed to bond aluminum or gold wires ranging from 0.0007 in. to 0.002 in. Bonds are made by the wedge-wedge technique using ultrasonic energy to attach aluminum wire at room temperature and adding work piece heat for gold wire. Wire is clamped and threaded diagonally under the bonding wedge, allowing independent feeding action but requiring front-to-back bonding direction.

The bonding tool is moved vertically by motor through a range of 0.500 in. This motion is programmed to decelerate deceleration, not just velocity - called "S-Curve" control -- to place the tool in work contact without impact. Work is moved horizontally in Y direction by motor on a machine way mounted atop the X-Y positioning platform. This machine way is also adjustable vertically by thumbscrew through a range of 0.375 in. to accommodate work of varying thickness. Work is positioned for bond targeting by the operator with mechanical advantage of 6:1 ratio. This platform is locked against movement during the application of ultrasonic energy by an air brake in a manner that is transparent to the operator. Work is viewed on a television monitor for alignment of the bond target with reference to a screen crosshair. To allow a true vertical camera view, the entire tool platform and tool assembly is moved horizontally on a machine way by separate motor to withdraw the tool from the view path during alignment, and then to return for bonding. When aligned, bonding is initiated either at the manipulator control or at the keypad, and proceeds to make all bonds of this connecting wire.

The ultrasonic transducer is K~Sine Model 24-W, one half wave in length, operating at a nominal frequency of 63 KHZ. Built in ultrasonic power supply is K~Sine Part No 6795, four Watts, dual channel. Settings of power and time program values are executed via an eight bit interface. Force is adjustable through a range of 10 to 90 grams. Radiant tool heat with panel mounted, constant current control is included.

Preparation of a new end of the wire stock and the threading of that end into the feed hole of a 45° bond tool can be done automatically by machine motions following a simple location of the wire relative to the tool. The method is patented and requires use of special bond tools available from West·Bond.

Standard bonding method of Model 4500B is 45° wire feed, clamps behind the tool, traditional wedge-wedge. Optionally, bonding can be done by WEST· BOND's patented "deep access" method, vertical feed with overhead clamps. Only the bond head need be exchanged at the attachment of two pivot points. Therefore, the machine is inherently convertible and may be purchased with either or both tool assembly types for maximum flexibility.

Definitions of Models of this Series:

Model No. 4500B. This machine with single tool assembly for 45° wire feed.

Model No. 4600B. This machine with single tool assembly for deep access wire or ribbon feed.

Model No. 4601B. This machine with single tool assembly for XtraDeep Access wire feed, Assy No. 6908.

Model No. 4546B. This machine with two tool assemblies, convertible to perform both 45° wire feed and deep access wire feed.

Features available for this Series:

Feature No. 46B. Tool assembly only, for deep access wire feed.

Feature No. 69B. Tool assembly only, for 45° wire feed.

Feature No. 68B. Exchange of manipulator ratio form 6:1 to 8:1 - Assembly No. 7350 replaces Assembly No. 7170. Not available from stock. Parts list is not computer defined: Whole machine order must be handled on paper.

Feature No. 72B. External view TV camera, Assembly No 6392.003, provides a side view of the bonding operation. View shown on the monitor is switched automatically between the alignment and the bonding views at appropriate times during the machine cycle. This Feature can be appended to any model number above.

The microscope recommended for this model is Olympus Stereo Zoom Model SZ3060 with K~Sine fluorescent shadowless illuminator. Neither microscope nor illuminator is included; however, wiring and receptacle for this illuminator are built in. Television camera and monitor for alignment are included. One recommended bonding tool is included.

All workholders are priced separately, and should be ordered separately. A universal unheated workholder, capable of holding most common substrate devices between a pivoted clamp lever and adjustable backstops, is maintained in stock and is available for delivery in the same time span as the machine. Quite a large number of previously designed special workholders, both heated and unheated, are available but are not stocked, and cannot be promised for delivery with the machine. These should preferably be on an order separate from the machine order, but if not, the machine order must state that partial deliveries are allowed. Workholders for new work pieces requiring custom design and fabrication will be quoted upon receipt of drawings and samples: These must be ordered on separate purchase orders.

Utilities required are electric power 115 VAC, 50/60 Hz, 3 Amps; compressed air at 50 psig; and shop vacuum. Physical dimensions of the machine are 15 in high x 36 in wide x 24 in deep, exclusive of microscope. Weight is 95 lb. uncrated, or 150 lb. crated.

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