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Probably the most ubiquitious hand-held electronic device today, the cellular phone must also be one of the most durable. Its numerous breakable elements—LCD, component connections and opposing circuit boards, for example—must be designed to absorb and dissipate the shock energy resulting from a bump against a hard surface or a drop onto the floor. Here are some of the shock solutions E-A-R has designed and produced.
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As wafer-thin pads behind the display screen, CONFOR® foam absorbs nearly all the energy that can be transmitted to the LCD from a bump or drop. The highly damped material controls energy at the cellular level and minimizes LCD flexure. Engineered to be rate-sensitive as well, the foam does not rapidly rebound or amplify and return the impact.
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Surrounding the perimeter of the LCD with shock-absorbing ISODAMP custom molded part not only helps with positioning and assembly but also protects against breakage and the flexing that can cause a "rainbow" effect. The elastomer's formulation is highly "tunable" in terms of its modulus and damping properties, enabling highly customized but easily revised components in a product platform.
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A simple way to improve a cell phone's acoustical performance is a thin, die-cut disk of CONFOR foam. This solution is easily customized because the highly energy-absorbent foam is available off-the-shelf in four stiffnesses and in several formulations, including electronics grade. (A new low-density, low-surface-tack formulation—CF-34—has been engineered specifically for use as self-conforming circuit board snubbers.)
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To prevent closely layered circuit boards from colliding during a shock event, E-A-R designs custom-molded VeraDamp TPE snubbers, whose surfaces mirror the boards' configurations. The elastomer's formulation is highly "tunable" in terms of its modulus and damping properties, enabling highly customized but easily revised components in a product platform. The damped elastomer snubber fills the void between the components and helps absorb and dissipate the potentially destructive energy.
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Numerous cell phone components—speakers, tranducers and data ports—can be protected with ISODAMP elastomer "shells," or boots. The boots can be configured to help with component positioning and phone assembly as well.
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Custom-molded VeraDamp strips, strategically placed within the phone, can both aid with shock absorption and provide a seal against crosstalk between the speaker and microphone chambers.
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