Digital camera flash LED, where are the key components?
Signals, electronic signage, backlights for displays, lighting products, etc., LED (light-emitting diode) applications are steadily expanding. It is estimated that it will also be used as a flash for digital cameras in the near future. To date, digital cameras have long used xenon lamps as flashlights because Xenon lamps emit intense light in an instant and are inexpensive. However, because of the principle of using helium discharge and the like, it is not possible to easily and flexibly adjust the illumination interval and length. LEDs are easy to implement a variety of flashes, such as micro-lighting for close-up, multiple illuminations that can be easily optimized for indoor and backlighting, and torch-type continuous illumination that is very useful when shooting video. The only downside is that the standard of light required by digital camera manufacturers is not currently available. (In fact, smart phones with digital camera functions have begun to be equipped with LED flash, because the demand for light from smart phones is not as high as that of digital cameras.) In this context, ROHM has found a way to make the digital camera flash LED, because the curtain has developed a key component. So, what exactly is this key component? The answer is a thin (layered) electric double layer capacitor (EDLC). The electric double layer capacitor (EDLC) developed by ROHM provides the high current required for digital camera flash in an instant. In terms of the flash index (GN) indicating the amount of flash light, the GN value of the LED flash module in which the EDLC and the LED are combined is 4 or more. The GN of a compact digital camera flashlight using a xenon lamp is usually 4 to 6, "a digital camera manufacturer requires an equivalent GN value" (Rome). The company is considering starting sample shipments in the next few months. This time, in order to achieve a GN value of 4 or more, ROHM uses a laminated EDLC structure (Fig. 1). Since the distance from the tip of the collector to the electrode is short, the resistance can be lowered and the power density can be easily increased. According to the company, the laminated product developed this time can increase the power density to 40,000 W/kg which is about 60 times that of a cylindrical product.
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