Abstract:
The present invention relates to a geomagnetic sensor comprising a powder formed phase transition material; and a constant-temperature layer coated on the sensor surface. More specifically, a phase transition material of the present invention maintains temperature of the sensor to be constant wherein the size of the phase transition material is 0.1-100um. In addition, the constant-temperature layer is made of epoxy.
Abstract:
PURPOSE: An ultrasonic sensor and a manufacturing method thereof are provided to have compact size by integrating a piezoelectric device and a temperature compensation device, and to simplify a manufacturing process of the ultrasonic sensor. CONSTITUTION: An ultrasonic sensor(10) includes a case(20), a piezoelectric vibration device(30), a temperature compensation capacitor(40) and connection terminals(70,72). The piezoelectric vibration device transmits an ultrasonic wave to the outside according to an internal electric signal. The capacitor compensates variation of capacitance according to an external temperature. The piezoelectric vibration device and the capacitor are able to be integrated. The connection terminals are connected to an internal circuit. The connection terminals are electrically connected to electrode patterns(50,52,54,56), and give polarity to ceramic members(310,410).
Abstract:
PURPOSE: An ultrasonic sensor is provided to strengthen a vibration force and easily perform mass production by stably combining accessories using a lead line which divides the upper electrode and the lower electrode of a temperature compensation ceramic. CONSTITUTION: An ultrasonic sensor(100) comprises a temperature compensation ceramic(110), a socket(120), a support(130), a - terminal(140), a + terminal(150), a sound-absorbing material(160), a piezoelectric ceramic(170), and a case(180). The temperature compensation ceramic(110) has a no-polling property. The socket is inserted into both sides of the temperature compensation ceramic, and the - terminal and the + terminal are connected in both sides. One side of the - terminal is fixed to the temperature compensation ceramic and the other side is fixed to the case. One side of the + terminal is fixed to the temperature compensation ceramic and the other side is fixed to the piezoelectric ceramic. The piezoelectric ceramic vibrates by applying a driving voltage to terminals(140,150). The bottom surface of the case vibrates by the vibration of the piezoelectric ceramic, and ultrasonic waves are emitted in the direction of crossing with the bottom surface at a right angle. The sound-absorbing material is built in the case, plays the role of vibration absorption and vibration diminution and is arranged in the upper part of the socket. The piezoelectric ceramic is comprised of piezoelectric elements, generates ultrasonic waves when power is applied, and vibrates up and down.
Abstract:
PURPOSE: An ultrasonic sensor and a manufacturing method thereof are provided to make automatic and mass production possible with easy assembly. CONSTITUTION: An ultrasonic sensor(100) includes a piezoelectric element(120), a temperature compensating capacitor(150), a first lead line(160), a second lead line(165), and a first molding part(170). The piezoelectric element is fixed to the bottom surface of the case through a conductive adhesive. The temperature compensating capacitor is positioned in the top of the piezoelectric element. The first lead line is inserted into the case and electrically connected to one side of the temperature compensating capacitor and the piezoelectric element. The second lead line is inserted into the case and electrically connected to the other side of temperature compensating capacitor and the case. The first molding part is adhered to the outsides of the portion of the temperature compensating capacitor, the first lead line, and the second lead line.
Abstract:
There is provided a haptic feedback actuator, a haptic feedback device and an electronic device. The haptic feedback actuator includes a support plate disposed in a lower portion of a haptic device; one or more actuators disposed on the support plate, each having one end towards a central portion of the support plate and the other end towards a corner of the support plate, and generating vibrations so as to give different types of haptic feedback according to a change in contact pressure applied to the haptic device; and one or more dividing portions, each penetrating the support plate in a thickness direction thereof and dividing the support plate into vibration areas corresponding to the respective actuators.
Abstract:
PURPOSE: A ceramic composition for a piezoelectric actuator and a piezoelectric actuator including the same are provided to lower the firing temperature of a piezoelectric material by using PZT(Lead Zirconate Titanate)-PNN ceramic powder. CONSTITUTION: Piezoelectric ceramic powder has a chemical formula of (1-x)Pb(Zr(1-y)Tiy)O3-xPb(Ni1/3Nb2/3)O3. A value of X in the formula is 0.25 to 0.4. A value of Y is 0.4 to 0.7. An additive is selected from ZnO and CuO. The additive is included in a content of 0.5 to 10mol%.
Abstract:
고유전율을 나타내면서 저온소결이 가능한 글래스 조성물, 이를 포함하는 유전체 조성물 및 이를 이용한 적층 세라믹 커패시터 내장형 저온동시소성 세라믹 기판이 제안된다. 제안된 글래스 조성물은 조성식 aBi 2 O 3 -bB 2 O 3 -cSiO 2 -dBaO-eTiO 2 를 갖고, 식 중, a, b, c, d, 및 e는 a+b+c+d+e=100, 40≤a<89, 10≤b≤50, 1≤c≤20, 0≤d≤10, 0≤e≤10 (단, d≠e=0)이다. 글래스, 비스무트, 저온소성
Abstract:
A method for manufacturing a multilayer ceramic substrate is provided to improve fixing intensity between a ceramic lamination and an external electrode in a second baking process by preventing crystallization of a glass component included in the ceramic lamination in a first baking process. A ceramic lamination manufacturing process is performed to manufacture a ceramic lamination including a glass component. A constraining layer is laminated on an upper part and a lower part of the ceramic lamination. A first baking process is performed within a first temperature range to prevent the crystallization of the glass component included in the ceramic lamination. The constraining layer is removed after the first baking process. An external electrode is formed on the ceramic lamination. A second baking process is performed to bake the ceramic lamination including the external electrode in a second temperature range. The second temperature range is higher than the first temperature range.
Abstract:
다층 세라믹 기판의 제조 방법이 개시된다. 본 다층 세라믹 기판의 제조 방법은, 캐비티가 형성된 미소결 세라믹 적층체를 마련하는 단계, 캐비티에 칩 소자를 실장하는 단계, 칩 소자가 실장된 캐비티에 세라믹 슬러리를 충진하는 단계, 세라믹 적층체의 상면 및 하면 중 적어도 일면에 구속층을 부착하는 단계, 및, 세라믹 적층체를 소성하는 단계를 포함한다. 이에 따라, 세라믹 적층체 소성시 캐비티의 변형을 방지하여 다층 세라믹 기판의 치수 정밀도 및 신뢰성을 향상시킬 수 있다. 다층 세라믹 기판, 세라믹 슬러리, 캐비티