Reading_wafers_OCR Reading Wafers OCR

: Microscan Reading Wafers Ocr reading_wafers_OCR industrysolutions

Open the PDF directly: View PDF .
Page Count: 1

Download
Open PDF In Browser	View PDF

Electronics Industry
Application
Case
Product
LineStudy
Card

Tracking Semiconductor Wafers

A typical semiconductor head wafer manufacturing facility
produces 500,000 units per day. With fabrication yields of
η = 50%, and 20,000 heads per wafer on a 150 mm wafer,
this drives the need to start approximately 50 wafers per
day. A typical processing boat will contain anywhere from 1
to 15 lots requiring separate processing recipes by lot.
To estimate the value of such a project, below is a simplified
list of necessary costs related to manufacturing:

Problem:
Manual reading of OCR leads to mis-processed 150 mm
wafers

Project:
Identify a simple low cost OCR solution to integrate into
current database / recipe management systems

• Average wafer cost: $600
• Manual process: 35 reads per wafer
• Scrap per quarter: $1 million or 20% of η

Solution:

The facility attributes approximately $4 million scrapped
wafer costs annually to the process of manually reading
wafer IDs and entering the data into the system to pull
the correct process recipe for the given lot. Since a single
processing boat can hold multiple lots, the operator must
read multiple codes and set up multiple recipes to run.

Result:

Microscan Quadrus® MINI imager with OCR reading
capability embedded in wafer turntable

Eliminate mis-processed wafers and potential ROI of $20
million

Since only complex wafer handling solutions were explored,
and investment in high end capital equipment is cost
prohibitive, the process remained manual. With the
development of low cost 2D imagers, such as Microscan’s
Quadrus® MINI, with the ability to easily read ID characters
(OCR, or Optical Character Recognition), a simple, fully
integrated solution became possible.

THE BOTTOM LINE
Successful installation of Quadrus® MINI imagers within the
wafer turntables allowed automatic data entry of the wafer
ID into their systems, and recovery of 15% of the yield lost
to mis-processing. The HD head fabricator has estimated
that if they maintain their output and simply reduce the
WSPD as a result of the improved yield, a 4-year ROI of $8
million (10% IRR) and a breakeven point of 3 quarters will
result. If they can sell the incremental units produced at a
fixed WSPD, their ROI becomes greater than $20 million.

www.microscan.com

©2009 Microscan Systems, Inc. 07/09

Product Information:
info@microscan.com
Auto ID Support:
helpdesk@microscan.com

Vision Support:
visionsupport@microscan.com
NERLITE Support:
nerlitesupport@microscan.com



---

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.4
Linearized                      : Yes
XMP Toolkit                     : Adobe XMP Core 4.0-c316 44.253921, Sun Oct 01 2006 17:14:39
Creator Tool                    : PScript5.dll Version 5.2.2
Modify Date                     : 2009:07:29 09:09:45-07:00
Create Date                     : 2009:07:29 09:09:45-07:00
Format                          : application/pdf
Title                           : reading_wafers_OCR.indd
Creator                         : showden
Producer                        : Acrobat Distiller 8.0.0 (Windows)
Document ID                     : uuid:9027fb05-1bbe-46c7-92d3-2893957396db
Instance ID                     : uuid:3fe51529-d028-4b67-b6be-accfa27c8fc5
Page Count                      : 1
Author                          : showden

EXIF Metadata provided by EXIF.tools