What is a dielectric film? What is the concept of a dielectric membrane?

Dielectric film refers to the coating material of non-metallic compounds, and the corresponding metal film. Dielectric films such as magnesium fluoride.

etc., it can be used to coat anti-reflection coatings, and metal films such as aluminum can be coated with high-reflection coatings.

Metallized film capacitors, consisting of one or more metallized films, dielectric films, and metal evaporation electrodes formed on one or both sides of a dielectric film; A pair of metal evaporation electrodes arranged opposite the dielectric membrane to form a capacitor core by stacking or winding; A pair of electrodes provided at both ends of the capacitor core are drawn out.

The full-film capacitor uses double-sided coarsened polypropylene film as the solid medium, benzyltoluene or phenyl ethane as the liquid medium, and the folded aluminum foil as the plate. It has the characteristics of small size, light weight, low loss, low temperature rise, excellent partial discharge performance and long life. Due to its excellent insulation performance, the specific characteristics of full-film capacitors are much better than those of other dielectric capacitors.

The heat dissipation area is also much smaller than that of other dielectric capacitors. However, its thermal stability is not necessarily superior to that of other capacitors. In recent years, full-film capacitors have become more and more widely used.

The laser medium film has the characteristics of indelible, high gloss, strong metallic feeling, good laser effect, high product grade, etc., and is used for the lamination of high-grade paper-plastic packaging (such as: high-end medicine boxes, daily chemicals, gift boxes, etc.) and various documents for anti-counterfeiting.

Wuhan Haolite anti-counterfeiting packaging **** is an enterprise specializing in the research and development and production of laser holographic products and printing and packaging products. R&D products have covered the entire industrial chain from the upstream, midstream and downstream of laser special equipment--- materials --- products, and have accumulated a lot of valuable experience.

Mirrors are made by coating the surface of glass or other objects to enhance reflection (interference superposition).

This is relative to the previous film paper compliance medium, refers to the capacitor plate between the insulation materials are all made of film - now are polypropylene film, the previous power capacitor insulation medium is from the capacitor paper, to the polypropylene and paper composite dielectric, and then to all the film (no paper) capacitors, because the polypropylene film uses a roughening process, no longer need capacitor paper.

Let's just say that!

The common ones are silicone oil, fluorine oil, castor oil and other vegetable oils.

In addition to the viscosity requirements, the temperature characteristics and stability (not vaporized and deteriorated) are mainly considered for the oil filling of the membrane box, and the stability of mineral oil is generally better than that of vegetable oil. Among them, silicone oil has a long application history, and fluorine oil is relatively stable at high temperature (90-160).

In addition to silicone oil, a single medium is rarely used for oil filling, and it is usually the manufacturer that puts forward special requirements (mainly temperature) for deployment. From my experience, as long as it is not a big road product, it is not durable, and it is generally refilled in less than two years.

It is recommended to buy some professional books and read them!

A film capacitor is a capacitor that uses a metal foil as an electrode, overlaps it with a plastic film such as polyethylene, polypropylene, polyethylene, or polycarbonate from both ends and winds it into a cylindrical structure.

Due to their high insulation resistance, excellent frequency characteristics (wide frequency response), and low dielectric loss, film capacitors are widely used in analog circuits.

According to the different raw material medium, it can be divided into metallized polyester film capacitors and metallized polypropylene film capacitors.

The working principle of film capacitors is the same as that of general capacitors, which is to store electric energy by storing charge on the electrode, and are usually used together with inductors to form LC oscillation circuits.

A brief introduction to film capacitors is convenient for novices and users to have a quick understanding of film capacitors.

The development direction of film capacitors is low cost, miniaturization, chip, ultra-high voltage, high power, high precision, and high reliability.

With the application and development of new materials and new process technologies, film capacitors will undergo major changes.

With the development of the whole machine, the application of film capacitors will bring opportunities and challenges.

Oji Film BOPP Film Products for Capacitors.

Features: It has a production line specializing in the production of electronic and industrial films.

By selecting high-quality resin raw materials and stretching them longitudinally and horizontally, we can produce BOPP films with high dielectric strength, excellent surface properties, and processing adaptability, and we can produce the world's thinnest BOPP films (3 microns or less) with uniform thickness.

Applications: All kinds of film capacitors.

Capacitor film for evaporation.

Capacitor film for easy impregnation.

Specification size: Film thickness range (um): micron.

Finished film roll range (mm): 1600mm or less.

EM-501: Film for BOPP capacitors, metal coating, corona treatment on one side.

EM-701EX: Film for low-shrinkage BOPP capacitors, metal coating, corona treatment on one side.

EM901K: Film for high dielectric strength BOPP capacitors, especially HEV capacitors, corona treated on one side.

EM510: Film for BOPP capacitors with rough surfaces, especially for impregnation purposes.

Film capacitor 1, very low loss; 2. Low absorption coefficient of medium; 3. High insulation resistance; 4. Good frequency characteristics; 5. Excellent self-healing and high stability. Applications: High-frequency pulse occasions, AC occasions, high-stability timing occasions, temperature compensation circuits, switching power supply systems and color TV industry, lighting LED circuits, filtering, bypass, coupling and other circuits.

Optical polarization film: used as polarization and polarization detector in optical instruments and lasers. Interference Filters:

It is used for photoelectric detection filtering. Dielectric reflective coatings: high and semi-reflective coatings for laser resonators.

Dual-band reflection and anti-reflection coating: It is used for equal-frequency lasers, which can be highly reflective or anti-reflection in both bands at the same time, or can be anti-reflection or high-reflection in the band alone. Spectroscopic film:

It is used as a beamsplitter for visible light and light. Mid-infrared dielectric film: used in the isomid-infrared band.

Metal film: vacuum evaporation gold, silver, aluminum reflective film and metal decorative film.

Optical polarization film in detail: used as polarization and polarization detector in optical instruments and lasers.

Interference filter: used for photoelectric detection filtering.

Dielectric reflective coatings: high and semi-reflective coatings for laser resonators.

Dual-band reflection and anti-reflection coating: It is used for equal-frequency lasers, which can be highly reflective or anti-reflection in both bands at the same time, or can be anti-reflection or high-reflection in the band alone.

Beamsplitter: Used as a beamsplitter for visible light and light.

Mid-infrared dielectric film.

Laser marking machine.

Metal Marking Machine.

There are the following.

1。imo film Touch screen film.

An anti-scratch and anti-static coating is applied to the surface of the PET film. The backside is vacuum sputtered with a conductive film (a total of three layers and transparent), and then the circuit is printed on the conductive film, and then the excess conductive layer is etched.

2。Light diffusion film.

Increases the brightness of the light and provides a uniform flood light.

3。Anti-glare demon.

The outermost film of the LCD TV is mainly used for scattering and preventing the picture from tailing4. Filter film.

It is used for filtering light in plasma televisions.

Film capacitors, a miracle capacitor with self-healing properties, are popular for their excellent performance and affordability.

However, when purchasing, don't forget to understand its parameters first, such as the dielectric strength and dielectric constant of film capacitors.

Dielectric strength refers to the ability of a capacitor's dielectric to withstand voltage.

It is defined as the large voltage per unit thickness of the specimen when it is broken down, expressed as volts per unit thickness.

The greater the dielectric strength of a substance, the better its quality as an insulator.

And there is a test to measure the dielectric strength of the dielectric of the film capacitor, the test of the dielectric strength of the film capacitor is to place the plastic film between two electricity, and continuously change the voltage between the electricity from low to high, until the dielectric breakdown occurs in the plastic film, causing the voltage applied between the electricity to be higher than the test voltage during the dielectric breakdown.

The dielectric constant of a film capacitor is a measure of the ability of the dielectric used in a film capacitor to store much electrical energy.

The dielectric constant is the product of the relative dielectric constant and the absolute dielectric constant in a vacuum, if there is a material with a high dielectric constant placed in the electric field, the strength of the electric field will decrease within the dielectric.

The dielectric constant of a film capacitor represents the degree of dielectricization, i.e., the strength of the dielectric's ability to bind the charge.

The greater the dielectric constant of the film capacitor, the stronger the ability to bind the charge; The smaller the dielectric constant of a film capacitor, the weaker the capacitor's ability to confine the charge.

The dielectric used in film capacitors has an impact on the capacitance of the capacitor, but it should be noted that the use of the same dielectric has the same impact, and the use of different dielectrics has different dielectric constants, and the impact is also different, which needs to be noted.

Remember to understand the parameters of film capacitors when choosing them, so that you can choose the right capacitor.

Let's look at the definition of dielectric number first: the electric field applied to the medium should be weakened by the electric field, and the ratio of the original applied electric field (vacuum) to the electric field of the final medium is the permittivity, which is called the induced rate. Indicates the characteristic coefficient of insulation capacity.

Phase dielectric number: The ratio of the dielectric number of the material to the vacuum dielectric number.

By definition, the higher the dielectric number, the higher the insulation performance, the more capacitance (conductor capacitance), and the correlation between phase dielectric number and resistance.

It doesn't feel like there's any point in asking such questions.

It is advisable to look at the book and check the information.

The thickness of the anti-reflection coating is 1 4, which refers to the 1 4 wavelength of light in the medium.

In thin film interference, when the optical path difference is an odd multiple of half a wavelength, the reflected light is weakened and the transmitted light is enhanced, and the minimum thickness of the anti-reflection coating is 1 4 of the wavelength of the light in this medium.

When the light hits the gentle interface of two transparent media, if the light is emitted from the optically dense medium to the optophobic medium, the light may be fully reflected.

When light is emitted from an optically phobic medium to a light-dense medium, the reflected light has a half-wave loss.

For anti-reflection coatings on glass lenses, its refractive index.

The size is between the refractive index of glass and air, and when the light is shot into the lens by the prepared air, the reflected light on both sides of the film is lost by half wave, so that the thickness of the film only meets the optical path difference between the two reflected lights.

for half a wavelength. The reflected light on the back surface of the film travels more distance than the reflected light on the front surface, i.e., twice the thickness of the film. Therefore, the film thickness should be 1 4 of the wavelength of the light in the thin film medium, so that the two reflected lights cancel each other out.

It can be seen that the thickness of the anti-reflection coating d 4N (where n is the refractive index of the film, which is the wavelength of light in the air).

Anti-reflection coating. Light has wave-particle biphasicity.

That is, it can be understood both as a wave and as a beam of particles moving at high speed (note, don't think of it as a simple wave and a simple particle here. They are all microscopic disrupting hosiery situations.

The wavelength of the red light wave = microns.

Violet wavelength = microns.

And the mass of a photon is.

Kilogram. So they are far from the macroscopic waves and particles we think. )

The principle of anti-reflection coating is to consider light as a kind of wave, because light waves and mechanical waves.

It is also of an interfering nature.

Apply a layer of anti-reflection coating to the front of the lens (generally"Calcium fluoride, slightly soluble in water), if the thickness of the film is equal to a quarter of the wavelength of the red light (note: red light is spoken of here) in the anti-reflection film, then the red light reflected back on both sides of this film will interfere and cancel each other out, and you will not see a little reflection in front of the lens, because this red light has already passed through the lens.