Sumita Optical Glass and Toyota Synthetic jointly developed a white LED packaged in glass and exhibited at CEATEC JAPAN 2008. Compared with the conventional resin-encapsulated LEDs, it is characterized in that (1) it can suppress deterioration of the package and improve the life; (2) heat resistance can be improved, and components can be densely arranged to achieve high density; (3) Support high current and achieve high brightness. Sample shipments are planned for 2008.
Figure 1: Structure of a glass-encapsulated white LED. The bottom plate and packaging materials are all inorganic materials
Figure 2: Sample line camera light source showing FPD glass substrate inspection
The manufacturing method is as follows: a white LED element manufactured by Toyota Synthetic (a phosphor is provided on the blue LED) is mounted on the ceramic substrate, and is placed inside the mold, and a low-melting glass is placed thereon, heated, softened, and pressure is applied to form ( figure 1). The key point is to heat and soften the low melting point glass without damaging the temperature of the component. The composition of the low-melting point glass and the like are not disclosed, and only the optical glass technology of the company is utilized. By changing the shape of the mold, it is possible to form a shape that satisfies various uses.
Previously, epoxy- and silicone-based resin-encapsulated LEDs were required to operate at temperatures below +80 °C. The glass-encapsulated LED developed this time can increase the operating temperature to +200 °C. For example, in a certain application, only 20 mA of current can flow through, and currently it can flow up to 150 mA.
The currently envisaged use is as a line lens camera source for FPD (flat panel display) glass substrate surface inspection. At the venue, a sample display of the product for this purpose was also carried out (Fig. 2). Since the heat resistance of the product is improved, various components can be densely arranged; a current of approximately 100 mA can flow, and the brightness can be increased to about 200,000 lx. In this field of use, existing white LEDs cannot meet the brightness requirements, so they have not been used before, but use optical fibers to guide light through an external light source. In addition, we will expand the use of line array cameras in the future. In addition, the technical details are scheduled to be released by Toyota Synthetic in the near future.
This site statement: This article is published for the purpose of transmitting more information, its authenticity has not been confirmed. Reprint please indicate the source!
Common Mode Coil For Automotive Product,Magntic Inductor Coil,Emi Common Mode Choke,Common Mode Coil Inductor
IHUA INDUSTRIES CO.,LTD. , https://www.ihua-inductor.com