設(shè)計多功能視力保護(hù)器的重要意義

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摘 要
目前，青少年視力低下，已成為國內(nèi)外共同關(guān)心的公共衛(wèi)生問題。資料顯示，我國小學(xué)生視力低下率為 26.96%，初中生 53.43%，高中生 72.8%，大學(xué)生 77.95%。特別是調(diào)查顯示 50%以上的學(xué)生及家長缺乏視力保健最基本的科普知識，不懂得“近視與盲只差一步”的危害性，因而有 41.6%視力低下的學(xué)生并未采取任何矯正措施，并且缺乏專業(yè)機(jī)構(gòu)的治療。為了分析視力的保護(hù)問題，并為采取合理措施提高視力保護(hù)提供依據(jù)，對視力保護(hù)器的研究和設(shè)計是首要解決的問題。
本設(shè)計以超聲波技術(shù)為主要理論依據(jù)。具體就視力保護(hù)器的理論與硬件的設(shè)計進(jìn)行了研究。
基于實驗室現(xiàn)有的硬件平臺，本文的研究目標(biāo)是完成多功能視力保護(hù)器的硬件開發(fā)與設(shè)計，并完成相應(yīng)的硬件制作。其研究內(nèi)容分為兩部分：對視力保護(hù)器的硬件設(shè)計和硬件制作。在設(shè)計中存在著如何有效的提高視力保護(hù)以及對硬件電路準(zhǔn)確調(diào)試的難點(diǎn)。在硬件設(shè)計中，基于超聲波技術(shù)設(shè)計的多功能視力保護(hù)器電路，通過超聲波接收頭對接收的超聲波信號進(jìn)行調(diào)制輸出，實現(xiàn)控制聲光提示電路工作的理論研究有一定的研究意義。
本文設(shè)計出了基于超聲波發(fā)射與接收技術(shù)的多功能視力保護(hù)器。通過實踐證明該視力保護(hù)器可行且可靠性良好，使用方便。本文期望通過該電子硬件的制作和理論的研究，能為后期進(jìn)一步設(shè)計多功能視力保護(hù)器并采取合理措施提高視力保護(hù)的有效性提供可靠和有效的數(shù)據(jù)源和信息依據(jù)。


關(guān)鍵詞：視力保護(hù)器，多功能，超聲波



Abstract
At present, young people in poor eyesight, has become a common concern to the domestic and international public health problem. Data show that China's primary vision for the lower rate of 26.96%, 53.43% junior high school, high school students 72.8%, and 77.95% of university students. In particular survey shows 50% more of the students and parents lack the most basic health care vision in the area of knowledge, do not know "Blind myopia with only one step" harmful, hence poor eyesight 41.6% of students did not take any corrective measures, and the lack of professional treatment. In order to analyze the visual protection, and to take reasonable measures to enhance the protection provided visual basis, right vision for the protection of the research and design is the primary solution to the problem.
The design of ultrasonic technology as the main theory. Specific vision for the protection of the theory and hardware design of the study.
Based on the laboratory's existing hardware platforms, the study aims to complete multi-functional vision for the protection of the hardware development and design and complete the corresponding hardware production. Its content is divided into two parts : the right vision for the protection of the hardware design and production of hardware. In the design of the existence of effective ways to protect and enhance vision for accurate circuit debugging difficult. In hardware design, based on ultrasonic technology of multi-circuit protection of eyesight, ultrasonic receiver through the first right to receive the ultrasonic signal modulation output. achieve sound and light control circuit theory study a certain significance.

This paper describes the design based on the ultrasonic transmitter and receiver technology for the protection of multi-functional vision. Practice has proven through the vision Protection feasible good reliability and convenient. In this paper, and hope that through the electronic hardware production and theoretical research, for the latter part of the further design multifunctional vision for the protection and take reasonable measures to enhance the effectiveness of protection vision to provide reliable and effective source of data and information based.

Keywords: visual protection; Multifunctional; Ultrasonic

目錄
1緒論 1
1.1本設(shè)計的研究背景及目的 1
1.2 國內(nèi)外研究現(xiàn)狀 1
1.3 本設(shè)計的研究方法和研究內(nèi)容 1
1.3.1本設(shè)計的研究方法 1
1.3.2本設(shè)計的研究內(nèi)容 2
2 本設(shè)計總體設(shè)計方案 3
2.1 方案論證與比較 3
2.2本設(shè)計方案選擇 6
2.3本設(shè)計總體設(shè)計方案 6
3 多功能視力保護(hù)器電路設(shè)計與計算 7
3.1測距電路的設(shè)計與計算 7
3.1.1電路的選擇 7
3.1.2元器件的選型及參數(shù)計算 7
3.2測光電路的設(shè)計與計算 8
3.2.1電路的選擇 8
3.2.2 元器件的選型……………………………………………………………….8
3.3定時電路的設(shè)計與計算 8
3.3.1電路的選擇 8
3.3.2元器件的選型及參數(shù)計算 8
3.4多功能視力保護(hù)器的總電路圖 18
4電路調(diào)試及結(jié)果分析 19
4.1測距電路的測試結(jié)果及分析 19
4.2測光電路的測試結(jié)果及分析 19
4.3定時電路的測試結(jié)果及分析 19
4.4電路實現(xiàn)的功能及分析 20
5結(jié)論與展望 20
5.1結(jié)論 20
5.2展望 21
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