What are the key components of digital camera flash LED?

Signal lamp, electronic signs, display backlight, lighting products, LED (light emitting diode) applications is steadily expanding. Estimated in the near future, but also can be used as a digital camera flash.

So far, digital cameras have long been used as flash lamps because xenon lamps emit bright light in a flash, and their prices are low. However, due to the principle of xenon discharge and other reasons, can not easily and flexibly adjust the interval and length of light.

The LED is easy to implement all kinds of flash, such as suitable for close-up trace luminescence, for a variety of indoor and light easily optimized multiple light, and the torch type very useful when shooting video continuous luminescence etc.. The only drawback is that it is still unable to meet the requirements of the digital camera manufacturers of light standard *. In this context, the Roma found flash digital camera to realize LED looks, because the curtain has developed a key component. So what is the key component?

* in fact, smart phones with digital camera function has begun to be equipped with LED flash, because the smart phone on the amount of light is not as high as the digital camera.

The answer is that thin (laminated) double layer capacitor (EDLC).

The double layer capacitor (EDLC) developed by Roma can provide the high current needed by the flash lamp in the instant. Flash flash index (GN), the LED flash module combined by the EDLC and LED of the GN value of 4 or more. The use of xenon lamp pocket digital camera with flash GN is usually 4 to 6, "digital camera manufacturers to achieve the same GN value" (Roma). The company is considering the next few months to supply samples.

This time, Rom in order to achieve more than 4 of the GN value, using a layered EDLC structure (Figure 1). Because the distance from the top of the collector to the electrode is short, the resistance can be reduced, and the power density can be increased easily. According to the company, the development of laminated products can increase the power density to equivalent to about 60 times the cylinder product of about 40 thousand W/kg.

About layered EDLC, in addition to Roma, there are currently three companies are developing this product, some manufacturers have begun production *. However, Rom said that other companies' products are mostly used to reduce the resistance and the use of toxic substances in the electrolyte". Toxic gases are produced when a EDLC is applied to a highly toxic substance. Should try to avoid the use of highly toxic substances.

* other companies' layered EDLC also seem to have achieved the same power density as the Rom product.

Thus, Rom in order to achieve high power density in the absence of highly toxic substances, reducing the three internal resistance (Figure 2). The first is to improve the electrical conductivity between the active substance and the active substance, between the active substance and the collector, thereby reducing the bulk resistance. Second is to improve the collector surface treatment process, inhibit the production of oxide film, and the interface resistance is reduced to zero. Third is to improve the charge and discharge of ion adsorption and separation of active substances, thereby reducing the ion diffusion resistance. Through these improvements, so that the digital camera equipped with EDLC vision becomes a reality.