| 摘要: | 本論文之目的在於討論中文點字觸摸顯示器之驅動器的設計與分析。點字驅動器在盲用中文顯示器是非常重要的元件，其作用是驅動點字桿向上達到點字凸出的效果，點字凸出的設計條件為點字桿必須提供最小向上15克的推力以及0.7 mm的凸出距離。本論文提出水平拍擊、垂直拍擊、垂直直驅、拴鎖電磁式驅動器、以及一種壓電式驅動器的可行設計。各種不同的驅動器依照其驅動特性，經由接觸力學分析、熱傳分析、電磁分析，以及壓電分析確保設計的可行性以及耐用性。
電磁式驅動器經由適應性類神經模糊推論系統（ANFIS）執行設計參數預測分析，其目的為得到最小的驅動器溫升以及最大驅動力條件下的供應電壓以及線圈組抗。ANFIS亦用來設計壓電式驅動器，在特定的點字桿推力以及特定行程的條件下得到合適的供應電壓以及夾持位置。經由研究的結果發現，電磁式驅動器可經由改變驅動機構的方式達到充足的點字桿推力以及改善驅動線圈溫升的問題。電磁式驅動器因強健的驅動機構以及純熟的製作技術，確有長驅動壽命以及價格便宜的優點。經由設計的壓電式驅動器相對於電磁式驅動器有體積小、重量輕、無發熱量，以及低耗電量的優點。本研究的結果將可改善視障資訊輔具的功能，並提升視障者應用電腦的能力，使得視障者在就學、就業以及生活上得到實質的幫助。
This thesis discusses the design and analysis of actuators for Chinese Braille display (CBD). An actuator is the most important part to manipulate the Braille dot in Braille display. An effective convex Braille dot requires a thrust force at least 15 gf and must be of 0.7 mm in height. The actuators developed in this thesis include two types, electromagnetic actuators and piezoelectric actuator. The design includes four electromagnetic actuators, called horizontal flapper, vertical flapper, vertically direct actuating flapper, and latched mechanism flapper, and a piezoelectric actuator called PZT actuator. The numerical analysis, including contact mechanics, heat transfer, and electromagnetics, are applied in designing electromagnetic actuators, and the piezoelectric analysis is used in designing piezoelectric actuator to ensure the feasibility and durability of the design.
The electromagnetic actuator is analyzed by Adaptive-Network-Based Fuzzy Inference System (ANFIS) to predict the design parameters, including supplied voltage and coil resistance, in order to obtain sufficient thrust force for Braille dots while maintaining flapper actuator’s temperature within limits. The ANFIS is also used to predict the piezoelectric actuator’s design parameters, including supplied voltage and clamped position, to obtain the sufficient thrust force and Braille dot height. The study shows the electromagnetic actuators can provide the sufficient thrust force and improve the temperature raise problem by using different actuating mechanisms. With the robust actuating mechanism and skillful manufacturing technology, the electromagnetic actuators have the advantages of long life span and low price. On the other hand, the piezoelectric actuator has the advantages of small size, light weight, no heat generation and low power consumption. The contribution of our investigation can improve the function of visually assistive device in information category and enhance the ability of visually impaired people (VIP) to use computer. With the maturity of CBD, the VIP can easily get education, job, and life assistance. |
