| 摘要 |
<p>A switch (20,30) for use in a laptop computer or other electronic equipment is surrounded by a protective, electrostatically shielding bellow-shaped housing (100) that is formed from a metal such as nickel. Preferably formed by casting, the bellows (140) has a sidewall thickness of about 0.06 mm to about 0.12 mm, a diameter ranging from about 2.6 mm to about 10 mm, and a compressive actuation displacement ranging from about 2 mm to about 8 mm. The number, shape and thickness of convolutions or pleats comprising the bellow may be designed to tailor the actuation force vs. actuation travel stroke transfer function. A substantially linear transfer function is achieved by providing a constant thickness housing wall and a constant convolution pitch. The housing produces good protection against water and dust, good tactile feedback. <IMAGE></p> |
