Illuminated keyboard

Abstract

A keyboard is provided having illuminating keys. A preferred keyboard includes scissor actuators for guiding and stabilizing each key in its upward and downward movement. A substantially translucent elastomeric diaphragm including elastomeric domes underlies the keys for biasing the keys upwardly. A seat underlies the elastomeric domes for supporting and engaging the bottom extremities of the scissor actuators. The seat may be made of translucent plastic, which functions as a translucent upper clamshell member, or non-translucent metal having sufficiently large holes for the passage of light. A substantially translucent circuit board is positioned under the seat for the creation and transmission of signals indicating depression of key members. The seat includes central holes allowing for the depression of keys to force the elastomeric domes to engage the circuit board to create electronic signals. A planar luminescent light source is positioned under the circuit board for transmitting light upwardly through the circuit board, seat, and elastomeric domes into the key members. The light source may include LED or LEC systems in adjoining relationship to a light pipe.

Description

RELATED APPLICATIONS[0001]This application is a continuation-in-part application of U.S. patent application Ser. No. 11 / 974,670 filed Oct. 15, 2007, which in turn is a continuation-in-part application of U.S. patent application Ser. No. 11 / 038,308 filed Jan. 18, 2005, now U.S. Pat. No. 7,283,066 issued Oct. 16, 2007, which in turn is a continuation-in-part application of U.S. patent application Ser. No. 10 / 294,396 filed on Nov. 14, 2002, now U.S. Pat. No. 6,918,677 issued Jul. 19, 2005, which in turn is a continuation-in-part application of U.S. patent application Ser. No. 09 / 899,960 filed on Jul. 6, 2001, now abandoned, which in turn is a continuation-in-part application of U.S. patent application Ser. No. 09 / 836,628 filed on Apr. 16, 2001, now U.S. Pat. No. 6,467,924 issued Oct. 22, 2002, which in turn is a continuation-in-part application of U.S. patent application Ser. No. 09 / 500,735, filed on Feb. 9, 2000, now U.S. Pat. No. 6,217,183 issued Apr. 17, 2001, which in turn is a con...

AI Technical Summary

Benefits of technology

[0018]An additional construction of the luminescent sheet can be obtained from MKS, Inc. located in Bridgeton, N.J., USA under the trademark designation Quantaflex™. The Quantaflex™ material is an electroluminescent lamp including luminescent phosphors embedded in the dielectric medium of a capacitor constructed in the form of a sheet. Electrodes, including at least one translucent electrode, form the top and bottom layers of the Quantaflex™ material. Upon application of an alternating current to the electrodes, the phosphors give off photons producing light in the visible spectrum. An advantage of the Quantaflex™ material is that the phosphors can be selectively encapsulated between the electrode layers of the luminescent sheet so as to selectively produce patterns of light emitted from the luminescent sheet. For example, for application with the present invention, it is preferred that the Quantaflex™ material be constructed to produce light only below and / or immediately adjacent to the key members so as to reduce power consumption.

[0042]Preferably, substantial portions of the keyboard and key members are coated on their exterior surfaces with a reflective opaque coating such as paint or the like where light is not intended to be emitted from their exteriors. More particularly, it is preferred that the key members and upper clamshell member are coated with a reflective paint for reflecting visible light, which would ordinarily be emitted from the key members and upper clamshell member or substantially absorbed by a substantially non-reflective material. Thus, traditional non-reflective paints and coatings such as dark grey, black or blue are preferably avoided. Meanwhile, diffuse reflective coatings such as light grey, white, and silver are preferred, as are coherent reflective coatings such as metallic silver, metallic gold and other shiny metallic colors. Alternative substantially reflective coatings can be selected by those skilled in the art without undue experimentation. In practice, much of the visible light, which would ordinarily be lost, is reflected in either a diffuse or coherent manner back into the upper clamshell member or key members until projected from the tops of the key caps to provide enhanced luminosity of the characters formed on the key caps.

[0044]Accordingly, it is an object of the present invention to provide an improved light distribution construction, such as a light guide, which is less expensive than previous designs.

[0047]It is thus an object of the present invention to provide an inexpensive and simple way to construct a keyboard having illuminating indicia or keys.

[0049]Moreover, it is an object of the present invention to provide a keyboard having illuminated indicia or key members which does not require routing of fiberoptic cables to each key member.

Problems solved by technology

A problem with prior art keyboards is that it is often difficult to discern the symbol appearing on the top of the key member under poor lighting conditions.

This causes the keyboard operator to memorize the key locations or to strain their eyes to operate the keys of the keyboard under low light conditions.

This has become a much greater problem in present day society as keyboards have become necessary for everyday use and as keyboard use is not limited primarily to operation by workers in business offices as in the past.

Often these places provide limited light making it difficult for keyboard operators to quickly and easily operate the keyboard.

Unfortunately, it is extremely difficult to route fiber optics to the keyboard keys of today's computer systems.

For example, it would be particularly difficult to route fiberoptic cables and provide a light source to the key members of today's notebook computers and palm-sized computer systems.

In addition, the light sources for use with prior art backlit keyboards require substantial power and in some cases, a fan for cooling which draws additional power.

These constructions are prohibitive for portable computers such as laptop and notebook computers which draw on the power of a rechargeable battery and where power is at a premium.

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