Optical-mechanical roller with ratchet

Details Optical-mechanical roller with ratchet Optical-mechanical roller with ratchet

1997-10-14

2000-12-05

Hjerpe, Richard A.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

345165, 345166, G09G 508

Patent

active

061573698

ABSTRACT:
A pointing device, such as a mouse, track ball or joystick, having a roller. The roller itself has either a plurality of slits or reflective strips for optical detection. A photoemitter and photodetector are positioned to detect rotation of the roller. Thus, the present invention eliminates the need for coupling to a separate optical encoder. The roller can be depressed to cause the actuation of a microswitch. In a preferred embodiment, the photoemitter and photodetector are aligned along a vertical axis, such that the position information is not affected by the vertical depressing of the roller.

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