Browse Prior Art Database

Detection and Verification of Dispensed Materials Using a Stand-Alone Vision System

IP.com Disclosure Number: IPCOM000011937D
Publication Date: 2003-Mar-26
Document File: 3 page(s) / 202K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that uses a self-contained vision system to detect the presence or absence of Thermal Interface Material (TIM) on the back surface of the die, and IHSA Lid Sealant Material on the surface of the substrate. Benefits include real-time feedback regarding the tested units.

This text was extracted from a Microsoft Word document.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 69% of the total text.

Detection and Verification of Dispensed Materials Using a Stand-Alone Vision System

Disclosed is a method that uses a self-contained vision system to detect the presence or absence of Thermal Interface Material (TIM) on the back surface of the die, and IHSA Lid Sealant Material on the surface of the substrate. Benefits include real-time feedback regarding the tested units.

Background

Currently, the problem of TIM detection is solved by continuous adjustment of the vision detection level. This works only on a lot-to-lot and product-to-product basis. Complete pattern detection is presently an issue. Sealant detection occurs during initial set-up and post IHSA at PIVI. Inspection is performed during a 5 minute RTI, (Real Time Inspection) during processing of the lot by the MT.

The current process uses the vision system on the Fuji QP-203. This system has several limiting factors for this application, including: the inability to detect a partial pattern, a very small detection area, and detection on a unit-by-unit basis (in the static mode), which adversely affects process UPH.

General Description

The following are the steps for implementing the disclosed method:

1)      Procurement of stand-alone vision system

2)      Programming of devices (i.e. various package types, etc.)

3)      Integration of the vision system into the production line

4)      Utilizing a proximity sensor to detect carrier presence to trigger image acquisition

Figures 1 through 3 illustrate the disclosed method.

Note.  The vis...