Invention Application
- Patent Title: MULTI-LAYER CAPACITOR HAVING UPPER AND LOWER PORTIONS WITH DIFFERENT DIELECTRIC LAYER MATERIALS TO REDUCE ACOUSTIC VIBRATION
- Patent Title (中): 具有不同介质层材料的上层和下层的多层电容器可减少声振动
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Application No.: US14721956Application Date: 2015-05-26
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Publication No.: US20160351330A1Publication Date: 2016-12-01
- Inventor: Zhong-Qing Gong , Kevin R. Richardson , Connor R. Duke , Yanchu Xu , Benjamin A. Bard
- Applicant: APPLE INC.
- Main IPC: H01G4/12
- IPC: H01G4/12 ; H05K3/30 ; H01G4/236 ; H05K1/18 ; H01G4/30 ; H01G4/012

Abstract:
A multi-layer capacitor such as a multi-layer-ceramic-capacitor (MLCC) has upper and lower dielectric layers separating upper and lower electrode layers, where the lower dielectric layers have a lower dielectric constant than the upper dielectric layers to reduce piezoelectric effect driven capacitor reaction forces on a printed circuit board (PCB) on which the capacitor is mounted. Such an MLCC may include the upper dielectric and electrode layers in a top portion of the MLCC; and the lower dielectric and electrode layers in a bottom portion of the MLCC. A bottom portion of the MLCC may be mounted on a PCB. As an example, the dielectric constant value of the lower dielectric layers may be between 1.5 and 3.5 times less than that of the upper dielectric layers to reduce piezoelectric effect driven capacitor reaction forces in the audio range of human hearing. Other embodiments are also described and claimed.
Information query