Appliance Design - November 2007 - (Page 23)

DISPLAYS & INDICATORS feature aluminum heat sinks that can be attached to the LED to dissipate the heat. If the footprint is too small that may not be possible, says Oliveros. In this case, Lumex offers the Koolbright LED product that uses a ceramic substrate to help protect the LED from the heat. Desired viewing angles are another important design consideration when specifying LEDs. LEDs emit light in a single direction, which means that it needs a diffuser lens to achieve a desired beam pattern. According to Jordon Papanier, marketing manager for LEDtronics Inc., Torrance, Calif., LEDs are available in many different viewing angles from 8 degrees to 180 degrees, and there are ways to get a wider viewing angle for LEDs like an inverted LED chip with a reflector cup. However, he cautions that the more the LED light is spread out, the lower the light output. A 5 mm, 3,000-Kelvin white LED with a viewing angle of 16 degrees puts out about 14,000 mcd. The same LED with a viewing angle of 55 degrees will put out 3,000 mcd, which is a loss of 11,000 mcd at a focal point of 16 degrees. In terms of overall size, LEDs have gotten smaller and smaller. Today, they come in several standard sizes including 0805, which measures 2.0 mm x 1.25 mm; 0603, which measures 1.6 mm x 0.8 mm, and 0402, which measures 1 mm x 0.5 mm. While getting smaller is usually better, in some cases the 0402 maybe too small for application scenarios that use pickand-place machines. These tiny LEDs maybe too small for the machines to pick up, some suppliers say. So, while for some the overall footprint may be small enough, its profile may not be svelte enough. Because of that, some LEDs are being offered in reduced profiles. Companies such as Avago and Kingbright have developed slim products. Avago Technologies product, the HSMR-CL25 (blue) and HSMW-CL25 (white), are available in the 0603 format and feature a 0.25 mm profile. The Kingbright product is in the 0805 format, and its profile is 0.4mm “The slim design offers flexibility for different designs, especially in membrane-switch applications,” says Yu. “Then you can put the LED behind the membrane switch to create a button effect.” Yu, as well as all of the suppliers interviewed, believes that the trend to brighter, more efficient LEDs will continue. With this, they say, the opportunities to improve and differentiate products will also continue to rise. < For more information, enter: Avago Technologies . . . . . . . . . . . . . . . . . . . . . . . . . .300 Or email: support@avagotech.com Kingbright Corp.. . . . . . . . . . . . . . . . . . . . . . . . . . . . .301 Or email: sales1@us.kingbright.com LEDtronics Inc.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .302 Or email: jpapanier@ledtronics.com Lumex Inc.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .303 Or email: Lmxsales@lumex.com Optek Technology. . . . . . . . . . . . . . . . . . . . . . . . . . . .304 Or email: visibleled@optekinc.com Problem: Find a small footprint thermal control with big range. Solution: Small. Reliable. Proven. The creepaction PEPI Model A brings a unique versatility to everything from hairsetters to heating pads. Preset calibrations can range from 5 - 200°C so many companies use it on different applications. When it comes to combining cost, size and range, the Model A has done it all. Only Pepi® thermostats and thermal protectors offer so many options in fit, configuration, cost and customization. For a close look send for our new 2006 Disc-Type and Conductive-Type Catalogs today. www.pepiusa.com Portage Electric Products, Inc. N. Canton, OH U.S.A. salesinfo@pepiusa.com • 1-888-GO4-PEPI For more Information Enter 111 www.applianceDESIGN.com AD10074Port.indd 1 applianceDESIGN November 2007 23 9/6/07 11:09:26 AM http://www.pepiusa.com http://www.pepiusa.com http://www.appliancedesign.com

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Appliance Design - November 2007 Contents Editorial Shipments/Forecasts News Watch Today’s LEDs are Brighter and More Colorful than Previous Versions, Allowing Designers More Opportunities to Improve and Differentiate Their Products. When Converting from CCFL to LED Backlights in LCD Panels, New Driving Methods are Needed. Electrowetting Technology Allows Displays to be Designed in an Extensive Range of Colors. Noise Problems are Not Always Easy to Find or Fix, but Acoustic Labs Can Help Designers Ferret Out the “Good” Noise from the “Bad.” A New Sanitization Protocol for Clothes Washers Combines the Best of Three Well-Established Provisions to Ensure Efficiency, Quality and Safety. Stricter EMC Requirements Raise the Bar for Appliances with Electronic Controls and Require Testing to New Levels. Despite Added Cost and Complexity, Gas-Modulating Systems have Migrated from Large-Scale Boiler Applications to Smaller Residential and Commercial Furnaces and Appliances. A New Treatment Technology Hardens the Surface of Light Alloys such as Aluminum and Magnesium and Expands Their Potential Applications. DesignMart Advertiser’s Index Association Report: AHAM

Appliance Design - November 2007

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