Ar-Film Blemishes - Mitsubishi Electric DPro930SB-BK Service Manual

2) Face Plate Defect
a. Blisters, opaque spots and elongated closed blisters
Average diameter (*1)
(mm)
0.76
0.51 ~ 0.75
0.26 ~ 0.50
0.11 ~ 0.25
Note (*1) Average diameter is smaller one of the following two expressions.
(a+b)/2 or a/20+2b (a: length, b: width)
Note (*2) Less than 5pcs. In area of 10mm diameter.
b. Flaw
Flaw Width (mm)
0.16 ~
0.11 ~ 0.15
0.06 ~ 0.10
~ 0.05
c. Other glass defect
Flaw, crack and chip must be visually noticeable.
See the limitation sample regarding iron rust and striae, etc.

6.2 AR-film Blemishes

6.2.1 Inspection Conditions
1) Place a CRT on the test table and illuminate the CRT screen surface by a fluorescent lamp.
2) The luminance on the CRT surface shall be set between 1000 and 1500 lux.
3) Those not recognized with the naked eye at the viewing distance of 40cm from the CRT surface are not
considered to be defects.
Allowable number (pcs)
Zone A Zone B
0 0
0 1
2 3
- -
Specification Length
Rejected
Less than 13mm
Less than 26mm
Unlimited
5-30
Minimum Separation
(mm)
Total
0
30
1
5
(*2)
-