Computer graphics processing and selective visual display system – Display peripheral interface input device – Cursor mark position control device
Patent
1995-06-07
1997-09-30
Faile, Andrew
Computer graphics processing and selective visual display system
Display peripheral interface input device
Cursor mark position control device
345157, G09G 508
Patent
active
056730683
ABSTRACT:
An end-of-travel sensor detects that an object has reached the end of its travel path by sensing a change in vectored force at a single pivot point of the object. The object is linked to and positioned away from the pivot point allowing the object to move within a travel area. During movement within the travel area, little force occurs at the pivot point. As the object reaches an end of travel, however, the object's inertia causes a force to occur at the pivot point. Detection of such force indicates an end-of-travel event. Detection of such force's direction indicates an end-of-travel direction. A elastomeric conductor is mounted about the pivot point within an opening. The conductor and edge contacts at the opening serve as switches. An end-of-travel force acting upon the pivot point closes one or more switches indicating an end-of-travel event. Detection of the affected switch(es) indicates an end-of-travel direction. Such event and direction are used to calibrate an on-screen cursor position to an absolute pointing device position.
REFERENCES:
patent: 5012230 (1991-04-01), Yasuda
patent: 5414420 (1995-05-01), Puckette et al.
patent: 5428355 (1995-06-01), Jondrow et al.
patent: 5504502 (1996-04-01), Arita et al.
patent: 5536911 (1996-07-01), Madill
patent: 5555004 (1996-09-01), Ono et al.
Jondrow Timothy J.
Smith Mark A.
Faile Andrew
Hewlett--Packard Company
Vu Ngoc-Yen
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