Apparatus and method for inspecting fluorescent screen

Details Apparatus and method for inspecting fluorescent screen Apparatus and method for inspecting fluorescent screen

1996-04-24

1998-06-16

Font, Frank G.

Optics: measuring and testing

Inspection of flaws or impurities

Having predetermined light transmission regions

356239, 356430, 356431, G01N 2100

Patent

active

057679614

ABSTRACT:
The present invention provides an apparatus for inspecting a fluorescent screen, including a line light source for radiating light onto an external surface of a panel formed at an internal surface thereof with a fluorescent screen, a line sensor disposed facing to the internal surface of the panel for detecting light emitted from the line light source and transmitted through the fluorescent screen, a device for varying the relative positional relationship between the panel and a combination of the line light source and the line sensor in a direction perpendicular to a length-wise direction of the line sensor, and a processor for comparing linear patterns detected by the line sensor to a reference pattern. The apparatus automatically inspects an entire fluorescent screen, and further automatically makes judgement as to whether the fluorescent screen is good or bad in quality. In addition, the apparatus can eliminate Moire fringes which would have been generated by fluctuation in the level of transmitted light to thereby make no misjudgment.

REFERENCES:
patent: 3835332 (1974-09-01), Bridges
patent: 4076426 (1978-02-01), Gross et al.
patent: 5243402 (1993-09-01), Weber et al.
patent: 5305080 (1994-04-01), Lee et al.
patent: 5459330 (1995-10-01), Venaille et al.

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