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Function-oriented Knowledge Base \ Optical Mouse Cord

Infrared signals transmit cursor control signals to computer

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Introduction
A conventional computer mouse is generally connected to a computer via a connection cord. A problem associated with a corded mouse is that the cord often gets in the way and is annoying. Moreover, it can be broken or operate intermittently. Since the cord is a necessary element, the mouse is limited in its operational area. It would be highly desirable to provide a mouse or other pointing device without a corded connection to the computer.
 
Description
To transmit a cursor control signal to a computer, the use of infrared signals is proposed. A proposed cordless mouse is comprised of a transmission port that emits infrared signals into a special mouse pad. The pad is comprised of an upper section and a lower section. From three lateral sides, the upper section is surrounded with a light-absorbing material. On one lateral side, the upper section borders on a light pipe. The upper section of the pad receives infrared signals. The received infrared signals propagate horizontally toward the light pipe. When the user's hand manipulates the mouse, the light pipe collects infrared signals and directs them into a light receiver. The light receiver retranslates infrared signals to the computer with or without light amplification. By using its own light receiver, the computer converts the infrared signals into cursor control signals. The cursor control signals are supplied to the input port of a host computer. Thus, infrared signals transmit a cursor control signal to a computer.
 
Additional information
The upper section of the mouse pad is made of a liquid display backlighting material. The lower section of the mouse pad is made of a resilient, foam-like material. Any other infrared signals propagating in the horizontal direction are absorbed in the light-absorbing material. This prevents undesired reflections of the infrared signals within the pad.
 
Reference
US Patent 6593911; Link >>
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