Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1986-05-06
1989-08-15
Moore, David K.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340706, G09G 100
Patent
active
048579033
ABSTRACT:
An electro-optical mouse has a four-quadrant photodetector, each quadrant producing a voltage proportional to the amount of light impinging thereon. The mouse slides over a surface having optically contrasting, i.e. reflecting and nonreflecting, indicia thereon. The position of the mouse relative to a coordinate system in the plane of the surface is determined by projecting light onto the surface and then detecting the amount of light reflected from the surface onto the respective quadrants. The mouse is able to detect within which of four ranges the amount of light impinging on each quadrant lies. A two-bit code indicating the range is generated for each quadrant, thereby forming an eight-bit detector code. In the case where the eight-bit detector code is the same, i.e., ambiguous, for two different positions of the mouse relative to an indicium being optically detected, the true position at a current instant in time is identified by interpolating between the position at a previous instant in time and the position at a subsequent instant in time. This look-ahead routine is performed after the predetermined ambiguous detector code has been recognized and after a determination has been made that the position at the previous instant in time was not at or in the vicinity of one of the two positions corresponding to the ambiguous detector code.
REFERENCES:
patent: 3297879 (1967-01-01), Meyer
patent: 3410956 (1968-11-01), Grossimon et al.
patent: 3541521 (1970-11-01), Koster
patent: 3541541 (1967-06-01), Englebart
patent: 3892963 (1975-07-01), Hawley et al.
patent: 4303914 (1981-12-01), Page
patent: 4364035 (1982-12-01), Kirsch
patent: 4390873 (1983-06-01), Kirsch
patent: 4409479 (1983-10-01), Sprague et al.
patent: 4521772 (1985-06-01), Lyon
patent: 4543571 (1985-09-01), Bilbrey et al.
patent: 4546347 (1985-10-01), Kirsch
patent: 4631400 (1986-12-01), Tanner et al.
patent: 4691199 (1987-09-01), Shell
patent: 4794384 (1988-12-01), Jackson
Brier Jeffery A.
Moore David K.
Summagraphics Corporation
LandOfFree
Electro-optical mouse with improved resolution for compensation does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electro-optical mouse with improved resolution for compensation , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electro-optical mouse with improved resolution for compensation will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-124555