Piezoelectric Sound Components 2012 by Murata Manufacturing Co.,Ltd.

More catalogs by Murata Manufacturing Co.,Ltd. | Piezoelectric Sound Components 2012 | 12 pages | 2013-07-26

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note s0leasereadratingand 54 forstorageandoperating rating solderingandmounting handlinginthiscatalogtopreventsmokingandorburning etc s4hiscataloghasonlytypicalspecifications4herefore pleaseapproveourproductspecificationsortransacttheapprovalsheetforproductspecificationsbeforeordering p15e-8.pdf oct.26,2012 piezoelectric sound components application manual murata manufacturing co ltd

note s0leasereadratingand 54 forstorageandoperating rating solderingandmounting handlinginthiscatalogtopreventsmokingandorburning etc s4hiscataloghasonlytypicalspecifications4herefore pleaseapproveourproductspecificationsortransacttheapprovalsheetforproductspecificationsbeforeordering p15e-8.pdf oct.26,2012 introduction murata is active in r&d of new electronic components seeking infinite possibilities with ceramic materials particularly as a pioneer in the development of piezoelectric ceramics murata has met the needs of the technical revolution in electronics with original products our ceramic resonators ceralock® ceramic filters cerafil® piezo sound components and various ultrasonic transducers have contributed to the development of electronics the piezoelectric sound components introduced here is also a production utilizing natural oscillation of piezoelectric ceramics today piezoelectric sound components are widely applied from consumer products to on-vehicle materials and

note s0leasereadratingand 54 forstorageandoperating rating solderingandmounting handlinginthiscatalogtopreventsmokingandorburning etc s4hiscataloghasonlytypicalspecifications4herefore pleaseapproveourproductspecificationsortransacttheapprovalsheetforproductspecificationsbeforeordering p15e-8.pdf oct.26,2012 1 type of piezoelectric sound components and oscillating system yyyyyyyyyyyyyyyyyyyyyy02 1 type of piezoelectric sound components 02 2 oscillating system 02 contents 2 procedures yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy 03 1 soldering procedures 03 2 design procedures 03 3 drive procedures 04 external drive method 04 self drive method 05 4 to raise up sound pressure level s.p.l 06 1 2 3 type of piezoelectric sound components and oscillating system 3 characteristics and measuring method yyyy 08 procedures characteristics and measuring method 1 characteristics 08 2 measuring procedure 08 measurement of resonant frequency and resonant impedance 08 measurement of sound

note s0leasereadratingand 54 forstorageandoperating rating solderingandmounting handlinginthiscatalogtopreventsmokingandorburning etc s4hiscataloghasonlytypicalspecifications4herefore pleaseapproveourproductspecificationsortransacttheapprovalsheetforproductspecificationsbeforeordering p15e-8.pdf oct.26,2012 1 type of piezoelectric sound components and oscillating system 1 type of piezoelectric sound components driving procedures type piezoelectric diaphragm piezoelectric sounder piezoelectric buzzer standard part number 7bb-15-6 7bb-35-3c pklcs1212e4001-r1 pkm13epyh4002-b0 k 1 external drive k k self drive k k k built-in circuit pkb24spch3601-b0 2 oscillating system basically the sound source of a piezoelectric sound component is a piezoelectric diaphragm a piezoelectric diaphragm consists of a piezoelectric ceramic plate which has electrodes on both sides and a metal plate brass or stainless steel etc a piezoelectric ceramic plate is attached to a metal plate with adhesives fig 2

note s0leasereadratingand 54 forstorageandoperating rating solderingandmounting handlinginthiscatalogtopreventsmokingandorburning etc s4hiscataloghasonlytypicalspecifications4herefore pleaseapproveourproductspecificationsortransacttheapprovalsheetforproductspecificationsbeforeordering p15e-8.pdf oct.26,2012 2 procedures 1 soldering procedures a lead wire is needed to apply voltage to the piezoelectric diaphragm when using a soldering iron the optimum temperature for soldering a lead wire to a metal plate is 320 to 350°c for 3 seconds and the same temperature for the ceramic electrode for 0.5 second or less the lead wire should be as fine as possible as it works as a load restricting oscillation of the piezoelectric diaphragm example awg32 2 2 design procedures in general man s audible frequency range is about 20 hz to 20khz frequency ranges of 2khz to 4khz are most easily heard for this reason most piezoelectric sound components are used in this frequency range and the resonant

note s0leasereadratingand 54 forstorageandoperating rating solderingandmounting handlinginthiscatalogtopreventsmokingandorburning etc s4hiscataloghasonlytypicalspecifications4herefore pleaseapproveourproductspecificationsortransacttheapprovalsheetforproductspecificationsbeforeordering p15e-8.pdf oct.26,2012 2 procedures 3 drive procedures drive procedures for piezoelectric sound components include a external drive method and b self drive method as shown in fig 5 a external drive method 2 external drive method this method produces sound by driving the piezoelectric diaphragm with electric signals supplied from an external oscillating circuit such as a multivibrator using this method the piezoelectric buzzer can work as a speaker in this method a mechanical oscillation qm of the piezoelectric diaphragm is damped properly to provide a wider frequency band of the sound pressure this is applied to a switching sounds of home electric appliances key-in sounds of oa equipment because it can

note s0leasereadratingand 54 forstorageandoperating rating solderingandmounting handlinginthiscatalogtopreventsmokingandorburning etc s4hiscataloghasonlytypicalspecifications4herefore pleaseapproveourproductspecificationsortransacttheapprovalsheetforproductspecificationsbeforeordering p15e-8.pdf oct.26,2012 procedures 2 notice handling in using external drive method 1 electric charges accumulated in the piezoelectric diaphragm due to thermal and mechanical shock may cause high voltage which may destroy lsi use the method using a zener diode as shown in fig 7 to prevent this 2 applying d.c voltage to the piezoelectric diaphragm in the environment of high humidity causes ag migration therefore design a circuit which does not require d.c voltage be applied for a long time 3 consider the following points in connecting a piezo ringer and tone ringer ic i for external capacitors and resisters especially when the ringing frequency is changed by adjusting variable resistor tone may be

note s0leasereadratingand 54 forstorageandoperating rating solderingandmounting handlinginthiscatalogtopreventsmokingandorburning etc s4hiscataloghasonlytypicalspecifications4herefore pleaseapproveourproductspecificationsortransacttheapprovalsheetforproductspecificationsbeforeordering p15e-8.pdf oct.26,2012 2 procedures 2 notice handling in using self drive method 1 when the piezoelectric buzzer is set to produce intermittent sounds sound may be heard continuously even when the self drive circuit is turned on off at the x point shown in fig 9 this is because of the failure of turning off the feedback voltage 2 build a circuit of the piezoelectric sounder exactly as per the recommended circuit shown in the catalog hfe of the transistor and circuit constants are designed to ensure stable oscillation of the piezoelectric sounder 3 design switching which ensures direct power switching 4 the self drive circuit is already contained in the piezoelectric buzzer so there is no need to

note s0leasereadratingand 54 forstorageandoperating rating solderingandmounting handlinginthiscatalogtopreventsmokingandorburning etc s4hiscataloghasonlytypicalspecifications4herefore pleaseapproveourproductspecificationsortransacttheapprovalsheetforproductspecificationsbeforeordering p15e-8.pdf oct.26,2012 procedures 2 in summary the following are typical examples of raising s.p.l q i ii iii in fig 6 input d.c voltage for piezoelectric sound components should be getting larger variable range of input voltage should be less than maximum input voltage w i ii iii in fig 6 the resistor that is connected in parallel should be changed to a booster coil approx 20-50mh e in case that is driven by ic directly like as fig 11 input voltage of piezoelectric sound components should be twice larger by btl bridge tied load drive circuit involved an inverter in addition to the previous methods based on the electrical circuit it is also possible for piezoelectric sound components to raise up

note s0leasereadratingand 54 forstorageandoperating rating solderingandmounting handlinginthiscatalogtopreventsmokingandorburning etc s4hiscataloghasonlytypicalspecifications4herefore pleaseapproveourproductspecificationsortransacttheapprovalsheetforproductspecificationsbeforeordering p15e-8.pdf oct.26,2012 3 characteristics and measuring method 1 characteristics type piezoelectric diaphragm piezoelectric sounder external drive piezoelectric sounder self drive resonant frequency k resonant impedance k capacitance sound pressure level oscillating frequency current consumption input voltage operating voltage kkkkkkkkkkkk 3 piezoelectric buzzer remarks common conditions operating temp range storage temp range measurement instruments lcr meter capacitance freq counter oscillating freq multi meter current consumption 2 measuring procedure measurement of resonant frequency and resonant impedance when the piezoelectric diaphragm oscillates freely in air the node does not move as shown

note s0leasereadratingand 54 forstorageandoperating rating solderingandmounting handlinginthiscatalogtopreventsmokingandorburning etc s4hiscataloghasonlytypicalspecifications4herefore pleaseapproveourproductspecificationsortransacttheapprovalsheetforproductspecificationsbeforeordering p15e-8.pdf oct.26,2012 characteristics and measuring method 3 measurement of sound pressure level s.p.l the sound pressure level is measured with a sound pressure level meter as shown in fig 14 fig 14 shows an example of the self drive piezoelectric sounder the relation between sound pressure level and distance between sound pressure level and voltage can be expressed with formula 2 the value of the sound pressure level under different operating conditions can be easily calculated using values specified in the catalog s.p.l db [under actual operating conditions s.p.l db [value specified in catalog -20 log a/bdb ··········································2 in

!note · please read rating and !caution for storage and operating rating soldering and mounting handling in this catalog to prevent smoking and/or burning etc · this catalog has only typical specifications therefore please approve our product specifications or transact the approval sheet for product specifications before ordering p15e-8.pdf