水晶工作原理.ppt

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1、July2nd,2001IntroductionofQuartzCrystalContentCharacteristicofQuartzMaterialCharacteristicsofCrystalUnitsChoosetheRightCrystalUnitCharacteristicsofQuartzMaterialQuartzMaterialPizeoElectricityWhyisAT-CutFrequencyvs.ThicknessLapping&EtchingQuartzMaterial(1)材料成份：二氧化矽SiO2材料組成：正六方晶系TRIGON

2、AL-DIGONALCLASS：32材料特性：熔點1,750℃@1atmα-β相變點537℃@1atm硬度~7.2莫氏硬度@25℃密度2,648Kg/M3@25℃壓電特性Y軸：機械軸MECHANICALAXIS光雙折性Z軸：光學軸OPTICALAXISQuartzMaterial(2)QuartzMaterial(3)SYNTHETICQUARTZCRYSTALAUTOCLAVEHYDROTHERMALMETHODRAWMATERIAL：SilicaHIGHPRESSURE：HIGHTEMPERATURE：~400℃HIGHTEMP.STABILITY：±0.2

3、℃LONGGROWTHTIME：1~6MonthHIGHPURITY：Infra-RedAbsorption(IRA)：3585CM-1PiezoElectricity(1)Thepositiveelectric-fieldisinducedwhenthemechanicforcepulltheOxygenatomoutoforiginalposition.Thenegativeelectric-fieldisinducedwhenthemechanicforcepushtheOxygenatomtowardcenterposition.TheSiO2isalw

4、aysinthestaticstateofelectricneutrial.PiezoElectricity(2)Whenaelectricfieldapplied,theinducedelectricfiledisgeneratedandforcetheOxygenatommoveoutward.TheSiO2isalwaysinthestaticstateofelectricneutrial.Whenaelectricfieldapplied,theinducedelectricfiledisgeneratedandforcetheOxygenatommov

5、ecloser.振動模式長度彎曲振動Length-widthflexure伸縮振動Extensionalflexure輪廓振動Faceshearflexure厚度振動Thicknessshearflexure基本波：Fundamental3倍頻：3rdovertone5倍頻：5thovertoneWhyisAT-Cut(1)WhyisAT-Cut(2)LowFrequencyCT+380DT-520ET+660FT-570HighFrequencyAT+35015’BT-490各種切割角度/溫度之關係WhyisAT-Cut(3)AT切割角度/溫度之關係Whyis

6、AT-Cut(4)Frequencyvs.ThicknessAT-CutCrystalF(MHz)=1670T(um)F(kHz)=1670T(mm)orFrequency14.318MHz20.000MHz26.973MHz35.328MHzThickness0.116mm0.083mm0.062mm0.047mmLapingMachinismLaping&Etching(1)SurfaceTreatment&EtchingLaping&Etching(2)AVG.sizeRoughnessInter-Crackumumum#50025622#80014310

7、#100011.52.58#20006.51.13.5#30004.00.82.6#40002.70.51.3#60002.00.30.8#100000.600.080.05Note:Theroughnessandinter-crackdataaredependetonthequartzmaterialandthetypeofabbresive.RoughnessInter-CrackCharacteristicsofCrystalUnitStructure&ProcessEffectiveCircuitofCrystalUnitParameterofEffec

8、tiveCircuitM