U.S. Patent number: 4,521,772
Filed: Jan. 13, 1983
Issued: Jun. 4, 1985
Inventor: Richard F. Lyon
Assignees: Xerox Corporation
A few years after Krisch filed his patent for a mouse with a light source and four-quadrant detector, Richard Lyon offered his take on the optical mouse. Lyon's design used a light source and an IC chip that contained an optical sensor and motion detector. As with Kirsch's design, Lyon's mouse required a special surface--a field of light dots on a dark background. But unlike the earlier mouse, Lyon's design didn't rely on the pad for its x-y orientation. Instead, it used the x-y coordinate system of the mouse body and used the pad's embedded pattern to track the mouse's motion relative to its body.
Image taken from U.S. Patent 4,521,772- Digitized by Google
Computer mouse evolution: Patent designs from the 1970s and 1980s
by Bill Detwiler | June 18, 2010, 10:43am PDT | Image 16 of 31
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Bill Detwiler is Head Technology Editor of TechRepublic. Previously, he worked as a Support Tech and IT Manager in the social research and energy industries.
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RE: X-Y Position Indicator For A Display System (Computer mouse evolution: Patent designs from the 1970s and 1980s)
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