Technical Specs

19
5. Limits of faceplate blemishes
(1) Scratches
The following criteria is applied to scratches on the faceplate of color display tubes.
Maximum size of scratches allowable
Width (mm) Length of single scratch(mm) Allowable number
0.05 or less Ignore 
0.06 ~ 0.12 50 or less 1
0.13 ~ 0.20 10 or less 1
Over 0.20  0
(2) Limits of faceplate defects
The following criteria is applied to defects of useful screen on panel face.
Zone Zone A Zone B
Blister (mm) 0.41 ~ 0.60 0.41 ~ 0.60
Opaque spot &
open blister (mm)
0.31 ~ 0.50 0.31 ~ 0.50
Single zone 1 2Allowable number
of defects
Total 3
Major
defects
Allowable minimum separation(mm) 50
Blister (mm) 0.25 ~ 0.60
Opaque spot &
open blister (mm)
0.20 ~ 0.60
Allowable number of defects 4
Gathering
defects
within
ϕ 50mm
Allowable minimum separation 12.7
Width (mm) 0.10 ~ 0.20 0.10 ~ 0.30
Maximum length (mm) 4.0 6.0
Single 2Allowable number of defects
Total 2
Elongated
Allowable minimum separation 76