Invotronics Manufacturing

Ronald Kenneth Finlay

A silicone dome switch assembly including a printed circuit board on which is mounted a dome member having a chimney structure. The chimney structure has a substantially rigid upper portion, a collapsible wall below the upper portion, and a substantially rigid lower portion. A vertically aligned contact post is connected at its top end to the upper pportion. The post's bottom end of the post is provided with a movable electrical contact. A light duct connects a light source to the lower portion and a reflector is attached to the post to deflect light from the light source up into the chimney. A key having a graphic area formed on it, is secured to the rigid upper portion, thus capping the chimney structure. When the key is pressed, it pushes downward the rigid upper portion, causing the collapsible wall to deform. This action pushes the contact post with the carbon pill towards the printed circuit board, completing an electrical circuit. The assembly may have multiple chimneys, each having a separate light duct.

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Ajax, Canada

Ronald Kenneth Finlay