Switch panel with touch switches
First Claim
1. Switch panel comprising a glass plate having markings printed on a surface thereof to form switch spaces for sensors located behind the glass plate in the areas of the switch spaces, characterized in that the switch sensors comprise semi-conductor elements responsive to infrared radiation, in that windows transparent to infrared radiation are provided between the switch sensors and the switch spaces, in that the glass plate has a dull opaque layer on a rear surface thereof which is impermeable to light, in that said windows comprise openings formed in said opaque layer, in that a filter layer comprising a printed silver stain is positioned on the rear surface of the glass plate within the area of said windows and which is transparent to infrared radiation, and in that an emitter is provided which emits infrared radiation through a window towards the glass plate with said radiation being reflected or disbursed when the switch space is touched to activate the switch sensors by reflected or disbursed radiation.
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Accused Products
Abstract
Switch panel in the form of a glass plate having markings printed thereon to form a switch space. The panel has an opaque layer on the back surface containing windows which are transparent to infrared radiation. A switch sensor responsive to infrared radiation is provided to receive any radiation that may pass through the window from an infrared radiation emitter where the radiation is reflected or dispersed when the switch space is touched.
77 Citations
13 Claims
- 1. Switch panel comprising a glass plate having markings printed on a surface thereof to form switch spaces for sensors located behind the glass plate in the areas of the switch spaces, characterized in that the switch sensors comprise semi-conductor elements responsive to infrared radiation, in that windows transparent to infrared radiation are provided between the switch sensors and the switch spaces, in that the glass plate has a dull opaque layer on a rear surface thereof which is impermeable to light, in that said windows comprise openings formed in said opaque layer, in that a filter layer comprising a printed silver stain is positioned on the rear surface of the glass plate within the area of said windows and which is transparent to infrared radiation, and in that an emitter is provided which emits infrared radiation through a window towards the glass plate with said radiation being reflected or disbursed when the switch space is touched to activate the switch sensors by reflected or disbursed radiation.
Specification