Ar-Film's Surface Defect - Mitsubishi DPLUS 74SB -BKA Service Manual

(2) Face plate defect
(a) Blisters, opaque spots and elongated closed blisters
Average diameter
(mm) #1
0.76 ~
0.51 ~ 0.75
0.26 ~ 0.50
0.11 ~ 0.25
#1: Mean diameter shall be either one of the following values, which is smaller.
(a+b)/2 or a/20+2b (a: length , b: width)
#2:Maximum 5 pcs. In area of φ10mm.
(b) Scratch
Width (mm)
0.16 ~
0.11 ~ 0.15
0.06 ~ 0.10
~ 0.05
(c) Other glass defects
Flaw, crack and lack cannot be distinguish easily by naked eye.
Iron rust conforms to limited sample.

6.2 AR-film's Surface Defect

6.2.1 Inspection Condition
(1) Put a valve on an inspective stand and Illuminate it from the top with white fluorescent light.
(2) Valve surface Illuminance is more than 1000Lux and less than 1000Lux.
(3) Observe from distance of 40cm from surface, disregard flaws which can not be distinguished from this
distance.
Allowable number (pcs)
Zone A Zone B
0 0
0 1
2 3
- -
Allowable Length (mm)
unlimited
Minimum Separation
Total (mm)
0
1
5
-
rejected
3
26
5-24
30
#2