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Dielectric film, film capacitor and electric device

A technology of dielectric film and film capacitors, which is applied in the direction of thin film/thick film capacitors, capacitors, fixed capacitors, etc., which can solve the problems of increasing the mounting density and large size that hinder the low height of the substrate, and achieve excellent rectification effect and small mounting density. , The effect of high breakdown electric field strength

Active Publication Date: 2016-03-30
KYOCERA CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, compared with other electronic components such as ceramic capacitors, film capacitors are still larger in size than other electronic components such as ceramic capacitors on substrates on which various electronic components are mounted. Research on the miniaturization of

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  • Dielectric film, film capacitor and electric device
  • Dielectric film, film capacitor and electric device
  • Dielectric film, film capacitor and electric device

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Embodiment

[0070] Select specific materials to make dielectric films. First, ceramic particles of composite oxides shown in Table 1 were prepared as ceramic particles. The ceramic particle is a material in which a dielectric material mainly composed of barium titanate is used as a core, and Mg, Sr, Zr, and Sn are solid-dissolved as oxides on the entire surface. In addition, the specific permittivity of the ceramic particle evaluated as ceramics was 1500-2500.

[0071]As an organic resin, a polycycloolefin polymer (molecular weight: Mw=20000, specific permittivity: 2.2) was prepared. In order to improve the compatibility with organic resins, the ceramic particles are subjected to silane coupling treatment.

[0072] Next, the above-mentioned ceramic particles are dispersed in a cycloolefin polymer to prepare a slurry. At this point, cyclohexane was added as a diluent.

[0073] Then, the above-mentioned slurry was coated on a polyethylene terephthalate (PET) film using a coater, and for...

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Abstract

[Problem] To provide a dielectric film, a film capacitor and an electric device capable of raising the relative permittivity without lowering the breakdown field strength. [Solution] The invention is provided with a dielectric film containing a ceramic particle (3) inside an organic resin (5), the ceramic particle (3) having two or more crystal phases (3a,3b) adopting crystal lattices formed by three axes a, b and c, with different axial ratios c / a. Owing to each crystal phase (3a,3b) having different extents of dielectric polarization originating from the differences in the shapes (dimensions) of the crystal lattices, the ceramic particle (3) has regions with different permittivities, allowing the relative permittivity to be raised without lowering the breakdown field strength.

Description

technical field [0001] The present invention relates to dielectric films, film capacitors and electronic devices. Background technique [0002] A film capacitor has, for example, a metal film formed by evaporation on the surface of a dielectric film made of polypropylene resin as an electrode. With such a structure, the film capacitor has the following advantages: even if a short circuit occurs in the insulation defect part of the dielectric film, the metal film around the defect part evaporates and scatters due to the energy of the short circuit, and insulation occurs, thereby preventing the film capacitor from being damaged. Insulation breakdown (for example, see Patent Document 1). [0003] Therefore, film capacitors have attracted attention because they can prevent burning and electric shock when the circuit is short-circuited. In recent years, they are first used in power circuits such as LED (Light Emitting Diode) lighting, and their applications are expanding (for ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/20C08K3/00C08L101/00H01B17/56H01G4/18
CPCC08L101/00H01G4/33H01G4/1209H01G4/206C04B35/4682H01G4/1227C08K3/22C01G23/006C04B35/62645C01P2002/50C01P2002/52C01P2004/64C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3225C04B2235/3244C04B2235/3293C04B2235/5445C04B2235/5454C08K9/10H01G4/18C08L23/20C08K3/00H05K1/18H05K2201/10015
Inventor 神垣耕世
Owner KYOCERA CORP