Browse Prior Art Database

HIGH HOLDING FORCE PLATFORM LIFT

IP.com Disclosure Number: IPCOM000008748D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2002-Jul-09
Document File: 2 page(s) / 80K

Publishing Venue

Motorola

Related People

John P. Hunt: AUTHOR [+3]

Abstract

The lift platform sits below the substrate level while a film is advancing on the line, as shown in Figure 1. When indexing procedure is completed the lift plate is raised to tnakc contact with the film by simultaneously activating four cams. At this point a high force end-effector of the bonder comes down to attach the chip to the flex film. The bonder applies pressure and heat to the top of the die to achieve a reliable bond. This pressure is transferred through the chip, flex and to the lift platform. After the bond occurs the cycle starts over.

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MOTOROLA Technical Developnwnts

HIGH HOLDING FORCE PLATFORM LIFT

by John P. Hunt, Ovidiu Neiconi and Richard L. Mangold

EXISTING PROCESS point a high force end-effector of the bonder comes down to attach the chip to the flex film. The bonder

  The lift platform sits below the substrate level applies pressure and heat to the top of the die to while a film is advancing on the line, as shown in achieve a reliable bond. This pressure is transferred Figure 1. When indexing procedure is completed through the chip, flex and to the lift platform. After the lift plate is raised to tnakc contact with the film the bond occurs the
by simultaneously activating four cams. At this cycle starts over.

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platform is lowered and the

Flexible Film

Granite Base

Fig. 1

PROBLEM SOLVED

  This platform lift allows a large amount of force to be applied to the work area using a single small- bore air cylinder, as shown in Figure 2, without actuating additional mechanical hard-stops. The amount of force the lift plate is capable of maintaining is dependent on the combined shear strength of the four pivot pins, and can withstand extremely high loads.

TRADITIONAL METHODS

A typical lifting platform is raised by mounting a linear air cylinder vertically beneath the platform.

It relies on the amount of pneumatic pressure to determine the maximum holding force {Pi x (Cylinder Bore Dia/?)squared x Line Pressure}. The holding force can be very minimal depending on the bore size of the air cyl...