{"id":57061,"date":"2023-04-25T16:20:47","date_gmt":"2023-04-25T21:20:47","guid":{"rendered":"https:\/\/www.bjultrasonic.com\/what-is-a-piezo-speaker\/"},"modified":"2025-01-27T06:16:44","modified_gmt":"2025-01-27T11:16:44","slug":"what-is-a-piezo-speaker","status":"publish","type":"post","link":"https:\/\/www.bjultrasonic.com\/cs\/what-is-a-piezo-speaker\/","title":{"rendered":"Piezoelektrick\u00e9 reproduktory: princip a pou\u017eit\u00ed"},"content":{"rendered":"<p>Piezoelektrick\u00fd reproduktor, \u010dasto zjednodu\u0161en\u011b naz\u00fdvan\u00fd piezo reproduktor, je miniaturn\u00ed zvukov\u00fd m\u011bni\u010d, kter\u00fd vyu\u017e\u00edv\u00e1 piezoelektrick\u00e9ho jevu k p\u0159em\u011bn\u011b elektrick\u00e9 energie na mechanick\u00e9 vibrace a n\u00e1sledn\u011b na zvuk. Na rozd\u00edl od tradi\u010dn\u00edch elektromagnetick\u00fdch reproduktor\u016f, kter\u00e9 vyu\u017e\u00edvaj\u00ed c\u00edvku v magnetick\u00e9m poli, piezo reproduktor pracuje na principu deformace piezoelektrick\u00e9ho materi\u00e1lu pod vlivem elektrick\u00e9ho pole.  Tento jev je zalo\u017een na schopnosti n\u011bkter\u00fdch krystalick\u00fdch materi\u00e1l\u016f, jako je nap\u0159\u00edklad k\u0159emen nebo speci\u00e1ln\u00ed keramika (nap\u0159. titan\u00e1t barnat\u00fd), m\u011bnit sv\u00e9 rozm\u011bry v z\u00e1vislosti na aplikovan\u00e9m elektrick\u00e9m nap\u011bt\u00ed.<\/p>\n<h3>Princip funkce piezo reproduktoru<\/h3>\n<p>Kdy\u017e je na piezoelektrick\u00fd materi\u00e1l aplikov\u00e1no st\u0159\u00eddav\u00e9 nap\u011bt\u00ed, materi\u00e1l se periodicky rozp\u00edn\u00e1 a smr\u0161\u0165uje.  Tyto vibrace jsou p\u0159en\u00e1\u0161eny na membr\u00e1nu, kter\u00e1 je s piezoelektrick\u00fdm prvkem spojena.  Membr\u00e1na pak vibruje a vytv\u00e1\u0159\u00ed zvukov\u00e9 vlny, kter\u00e9 vn\u00edm\u00e1me jako zvuk.  Frekvence vibrac\u00ed, a tedy i v\u00fd\u0161ka t\u00f3nu, z\u00e1vis\u00ed na frekvenci aplikovan\u00e9ho st\u0159\u00eddav\u00e9ho nap\u011bt\u00ed.  Amplituda vibrac\u00ed, a tedy i hlasitost zvuku, z\u00e1vis\u00ed na amplitud\u011b nap\u011bt\u00ed.<\/p>\n<h3>V\u00fdhody a nev\u00fdhody piezo reproduktor\u016f<\/h3>\n<p>Piezo reproduktory se vyzna\u010duj\u00ed \u0159adou v\u00fdhod a nev\u00fdhod ve srovn\u00e1n\u00ed s tradi\u010dn\u00edmi elektromagnetick\u00fdmi reproduktory.<\/p>\n<table class=\"table table-striped table-bordered\">\n<thead>\n<tr>\n<th>Vlastnost<\/th>\n<th>Piezo reproduktor<\/th>\n<th>Elektromagnetick\u00fd reproduktor<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Velikost<\/td>\n<td>Velmi mal\u00fd<\/td>\n<td>V\u011bt\u0161\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Hmotnost<\/td>\n<td>Lehk\u00fd<\/td>\n<td>T\u011b\u017e\u0161\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Cena<\/td>\n<td>N\u00edzk\u00e1<\/td>\n<td>Vy\u0161\u0161\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Kvalita zvuku<\/td>\n<td>Ni\u017e\u0161\u00ed, \u010dasto s vy\u0161\u0161\u00edm zkreslen\u00edm<\/td>\n<td>Vy\u0161\u0161\u00ed, v\u011brn\u011bj\u0161\u00ed zvuk<\/td>\n<\/tr>\n<tr>\n<td>Efektn\u00ed \u017eivotnost<\/td>\n<td>Krat\u0161\u00ed<\/td>\n<td>Del\u0161\u00ed<\/td>\n<\/tr>\n<tr>\n<td>Odolnost<\/td>\n<td>Vysok\u00e1 odolnost proti n\u00e1raz\u016fm<\/td>\n<td>Ni\u017e\u0161\u00ed odolnost proti n\u00e1raz\u016fm<\/td>\n<\/tr>\n<tr>\n<td>Frekven\u010dn\u00ed rozsah<\/td>\n<td>Obvykle omezen\u00fd<\/td>\n<td>\u0160ir\u0161\u00ed frekven\u010dn\u00ed rozsah<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h3>Aplikace piezo reproduktor\u016f<\/h3>\n<p>D\u00edky sv\u00fdm mal\u00fdm rozm\u011br\u016fm, n\u00edzk\u00e9 cen\u011b a vysok\u00e9 odolnosti nach\u00e1zej\u00ed piezo reproduktory \u0161irok\u00e9 uplatn\u011bn\u00ed v r\u016fzn\u00fdch oblastech.  Pou\u017e\u00edvaj\u00ed se nap\u0159\u00edklad v:<\/p>\n<ul>\n<li><strong>Elektronick\u00fdch za\u0159\u00edzen\u00edch:<\/strong>  bud\u00edky, kalkula\u010dky, hra\u010dky, d\u00e1lkov\u00e9 ovlada\u010de<\/li>\n<li><strong>Automobilov\u00e9m pr\u016fmyslu:<\/strong>  zvukov\u00e9 signalizace, senzory<\/li>\n<li><strong>Medic\u00edn\u011b:<\/strong>  ultrazvukov\u00e9 sn\u00edma\u010de (v n\u011bkter\u00fdch p\u0159\u00edpadech, nap\u0159\u00edklad u n\u011bkter\u00fdch model\u016f od Beijing Ultrasonic, se vyu\u017e\u00edvaj\u00ed piezoelektrick\u00e9 materi\u00e1ly s vysokou frekvenc\u00ed)<\/li>\n<li><strong>Pr\u016fmyslov\u00e9 automatizaci:<\/strong>  senzory, signalizace<\/li>\n<li><strong>Spot\u0159ebn\u00ed elektronice:<\/strong>  n\u011bkter\u00e9 typy n\u00e1hlavn\u00edch souprav<\/li>\n<\/ul>\n<h3>Materi\u00e1ly pou\u017e\u00edvan\u00e9 v piezo reproduktorech<\/h3>\n<p>Nejb\u011b\u017en\u011bji pou\u017e\u00edvan\u00fdm materi\u00e1lem je piezoelektrick\u00e1 keramika, specificky titan\u00e1t barnat\u00fd (BaTiO3).  V n\u011bkter\u00fdch aplikac\u00edch se v\u0161ak pou\u017e\u00edvaj\u00ed i jin\u00e9 materi\u00e1ly, jako je nap\u0159\u00edklad k\u0159emen.  Volba materi\u00e1lu z\u00e1vis\u00ed na po\u017eadovan\u00fdch vlastnostech reproduktoru, jako je frekven\u010dn\u00ed rozsah, \u00fa\u010dinnost a odolnost.<\/p>\n<p>Piezoelektrick\u00e9 reproduktory p\u0159edstavuj\u00ed cenov\u011b dostupnou a kompaktn\u00ed alternativu k tradi\u010dn\u00edm reproduktor\u016fm, i kdy\u017e s kompromisem v kvalit\u011b zvuku.  D\u00edky sv\u00fdm vlastnostem nach\u00e1zej\u00ed uplatn\u011bn\u00ed v \u0161irok\u00e9m spektru aplikac\u00ed, kde jsou po\u017eadavky na velikost a cenu prioritn\u00ed p\u0159ed po\u017eadavkem na vysokou v\u011brnost zvuku.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Piezoelektrick\u00fd reproduktor, \u010dasto zjednodu\u0161en\u011b naz\u00fdvan\u00fd piezo reproduktor, je miniaturn\u00ed zvukov\u00fd m\u011bni\u010d, kter\u00fd vyu\u017e\u00edv\u00e1 piezoelektrick\u00e9ho jevu k p\u0159em\u011bn\u011b elektrick\u00e9 energie na mechanick\u00e9 vibrace a n\u00e1sledn\u011b na zvuk. Na rozd\u00edl od tradi\u010dn\u00edch elektromagnetick\u00fdch reproduktor\u016f, kter\u00e9 vyu\u017e\u00edvaj\u00ed c\u00edvku v magnetick\u00e9m poli, piezo reproduktor pracuje na principu deformace piezoelektrick\u00e9ho materi\u00e1lu pod vlivem elektrick\u00e9ho pole. Tento jev je zalo\u017een na<\/p>\n","protected":false},"author":1,"featured_media":26935,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6415],"tags":[],"class_list":["post-57061","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","prodpage-classic"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/57061","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/comments?post=57061"}],"version-history":[{"count":0,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/posts\/57061\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media\/26935"}],"wp:attachment":[{"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/media?parent=57061"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/categories?post=57061"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.bjultrasonic.com\/cs\/wp-json\/wp\/v2\/tags?post=57061"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}