Optical trackball

Details Optical trackball Optical trackball

2006-04-25

2006-04-25

Chow, Dennis-Doon (Department: 2675)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

C250S221000

Reexamination Certificate

active

07034805

ABSTRACT:
An optical trackball is disclosed that is easy to operate without been worried about the contamination on the contacting shifts of encoders inside the trackball. When a distal motion from a user to rotate an operating ball having an uneven surface on the trackball, an image-detecting module will detect the varying of the reflected image from an illuminated portion of the uneven surface, causing the correspondingly moving of the cursor on the computer display.

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patent: 6529184 (2003-03-01), Julienne
patent: 6586720 (2003-07-01), Hu

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