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Keyboard battery charger Disclosure Number: IPCOM000020194D
Original Publication Date: 2003-Oct-31
Included in the Prior Art Database: 2003-Oct-31
Document File: 5 page(s) / 82K

Publishing Venue



Summary: A device is described by placing an electricity generator in the buttons of the portable computer keyboard to generate electricity and charge the battery.

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Keyboard battery charger


    The length of the usable period of the laptop computer is limited by the storage capacity of the battery. Recharge of the battery is required after a period of mobile usage. The advance of higher performance portable computers often results more power consumption. However the advancement of the battery storage technology cannot match the power consumption requirement from the processing and storage components in the computer. Using the supplementary power can significantly prolong the usage period of the laptop computer and other pervasive systems. Since the keyboard is the most frequently used mechanical device in the computer and also plenty of the energy supplied to the keyboard from the user in order to provide enough resistance force to respond to the sensitivity of user's fingers. To obtain power from the puncturing of the keyboard, turn the otherwise wasted energy into electricity and charge it into the battery can be a very desirable method to get supplementary power to extent the usable period of the battery supported systems.


Figure 1 shows a typical mechanical keyboard from a prior art (Ref
2) - 4 is the button pad, 41 is the guide plates, 42 and 43 together act as a pin that pushes against a foam sensor 5 which consists of a hard end face 51 and a metal foil 52. In its natural position, a hollow elastic rubber body 6 raises the key pad and the sensor up from touching the conductive bumps
21. When button pad 41 is pressed, the whole assembly moves down and metal foil 52 make a contact to the conductive bumps 21, signify the control electronics that a key has been pressed.


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Figure 1: An example of conventional computer keyboard (Ref 2)

In this disclosure we suggest to place an electric current generator


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that can be placed in the buttons of the computer keyboard such that the mechanical energy during typing can be converted into electrical energy which can be used to power the electronics or to charge a secondary battery.

A detail drawing of individual key pad modification is shown in Figure
2. 201 is button pad, 206 is a permanent magnet in a...