Geometrical instruments – Straight-line light ray type – Alignment device
Patent
1997-09-12
1999-04-06
Bennett, G. Bradley
Geometrical instruments
Straight-line light ray type
Alignment device
33263, G01C 1500
Patent
active
058902996
ABSTRACT:
A visual display with an alignment structure for visually determining a correct display angle and lateral displacement, top to bottom and left to right, for accurate color viewing. A first fixed pattern is located on a surface near a border of the display and a spacer supports a plate, elevated above the first pattern, having a second pattern around a throughole in the plate. The dimensions of the first and second patterns, the elevation of the second, and the throughole diameter are such that when viewed at the intended display angle the image of the first pattern is concentric with the image of second pattern. Alternatively, the spacer may be formed of a transparent member with the second pattern on a planar surface above and parallel to the first fixed pattern. A first and a second alignment structure may be located symmetrically about either side of the display to enable determination of lateral alignment as well as angle of the display.
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Bennett G. Bradley
International Business Machines - Corporation
Kaufman Stephen C.
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