The latest Nokia N90 and Motorola RAZR V3 clamshell mobile cell phones all incorporate sophisticated hinges which allow you to flip open your cell phones smartly amongst admiring onlookers. Another winner is the hinge assembly in Orange SPV M5000 3G PDA cell phone device which allows the screen half of the cell phone to swivel 180 degrees and close to allow simultaneous tablet mode and full phone functionality.
These hinge assemblies which were previously used in laptop computers have been designed into the sleekest cell phones, personal digital assistants (PDA) and small handheld digital cameras over the past few years.
Basically, the hinge assembly connects the cell phone base to the folder unit which contains the display screen. From the simple open-snap-close mechanism, the latest hinge mechanism now can control the angle of opening. Free-stop designs, where the folding stops at any angle, and 2 degree-of-freedom hinge assembly is in vogue. This flip-and-twist hinge assembly combines 2 rotary hinges with perpendicular axes, letting the clamshell cell phone flip open then twist 180 degress.
Each tiny custom hinge comprises a guide pin, shaft, cam,...
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