臺灣博碩士論文加值系統

微機電系統(MEMS)是先進奈米科技的一種，其擁有小尺寸、低功率消耗、低成本等等的優點，因此數以百萬計的基於MEMS技術的裝置已經在全世界被廣泛的使用。在數據採集的應用領域上，傳統的雷射式條碼掃瞄器是使用馬達驅動方式的反射鏡面(多面菱鏡)來引導、改變光的行進方向。如果我們改用以MEMS技術為基礎的掃描鏡面，將可以產生全新的雷射掃瞄器，具有速度快、體積小、更輕且效率比市面上現有的掃描器更好的優勢。
本論文主要是想實現一個基於MEMS掃描面鏡的條碼掃描系統，本實驗中所使用的微型掃瞄鏡面是由先進微系統公司所提供的，其設計是為了條碼掃描系統所使用，具有快速的掃描速度、大掃瞄角度、質輕且低功率消耗的特色。
本系統的設計與實現包括兩個部份，第一個部份是硬體上光學掃描系統的架設，另外ㄧ部分是軟體上Code39碼的解碼以及簡單快速的條碼錯誤糾正機制的設計。在本論文中我提出兩種系統結構的設計概念，並且在個人電腦上利用LabVIEW這套軟體實現Code39解碼演算法與簡單快速的條碼糾錯機制。

Micro-electromechanical systems (MEMS), a type of nanotechnology, have the advantages of smaller size, lower power consumption, potentially lower cost, and so on. Millions of MEMS-based devices are already at work around the world, making life safer and more convenient. In data collection applications the Traditional laser barcode scanners use a motor-driven mirror (polygonal mirror) to direct the laser light. If changing the component with MEMS-based scanning mirror will make it possible to produce laser data collection scanners that are significantly faster, smaller, lighter and more efficient than today''s legacy scanners.
In this thesis we want to implement a barcode scanning system which uses MEMS scanning mirror in place of original polygonal mirror. The MEMS scanning mirror used in this thesis is provided by OPUS Microsystems and is designed for barcode scanning system, which provides a fast scan rate, a large scan angle, low mass, and low operating power.
The implementation includes two parts. One is the optical scanning system set up in hardware. The other part is the Code39 decode algorithm and error correction method design in software. In this thesis we give two ideas of architecture design and propose two algorithms: Code39 decode algorithm and a quick、easy error correction algorithm. Finally, finish the decoder implementation using LabVIEW in PC.

Contents

誌謝.............. ........................................i
摘要.............. .......................................ii
Abstract ...............................................iii
Contents................... ..............................iv
List of Figures............ ..............................vi
Chapter 1 Introduction....................................1
1.1 Introduction.....................................1
1.2 Motivation and Problem Formulation...............3
1.3 Thesis Overview..................................4
Chapter 2 MEMS Mirror System Background Introduction......5
2.1 Dynamic Characteristics of MEMS Scanning Mirror .................................................5
2.2 Review on MEMS Scanning Mirror..................12
2.2.1 Review on Characteristics Measurement of
MEMS Mirror...............................12
2.2.2 Review on the Applications of MEMS Scanning
Mirror....................................14
2.3 Types of Barcode Symbologies....................19
2.3.1 1-D Symbologies..........................20
2.3.2 2-D Symbologies..........................23
2.4 Types of Barcode Scanner........................26
Chapter 3 Code39 Decode Method& Fault Tolerance Algorithm31
3.1 Code39 Specification............................31
3.2 Code39 Decode Algorithm.........................35
3.3 Fault Tolerance Algorithm.......................42
Chapter 4 MEMS Mirror Based Barcode Scanning System
Design........................................49
4.1 Design of the MEMS Mirror Scanning System.......49
4.2 Hardware Configuration..........................57
4.3 Software Configuration and Decoder Implement....62
Chapter 5 Experimental Result............................67
5.1 Experiment Setup................................67
5.2 Experimental Result.............................72
Chapter 6 Discussion & Conclusion........................83
References...............................................84

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