91
V400-F050/250/350
User’s Manual
Appe
ndix
Line Spee
d and Rea
d
in
g Time
/Ex
pos
ure Time
Appendix
Line Speed and Reading Time/Exposure Time
The following points must be observed when reading moving workpieces.
• Make sure that the still image display mode is constantly selected.
Exposure Time
To eliminate image blurring and stabilize reading, refer to the following formula to set
the lower limit of exposure time.
*1: “Pixels/cell > 4” must be satisfied with sufficient margin taken into account.
*2: The moving shift tolerance is 10% of the cell size.
Example: When V = 60 mm/s, C = 1.6 mm, M = 16, A = 10 mm, N = 512, R = 300 ms
and L = 30 mm
The exposure time is calculated as follows, which will not cause problems
with reading.
The exposure time is as follows.
Exposure time
T (s)
Code size
C (mm)
Symbol size
M
Field of vision
A (mm)
Number of image
pickup pixels
(Moving direction)
N
Pixels/cell
n = (C × N)/(A × M) *1
Moving shift tolerance W = C/M × 0.1 (mm) *2
Reading time
R (s)
Code pitch
L (mm)
Line speed
V (mm/s)
(Exposure time: T)
(Moving shift tolerance: W)
(Max. line speed: V)
W 0.1 ×
(Code size: C)
(Symbol size: M)
C
A
n
1.6 × 512
(10 × 16)
= 5.12 > 4
T
0.1 × 1.6
(16 × 60)
0.17 msec
=
Summary of Contents for 2D CODE READER
Page 1: ...USER S MANUAL 2D Code Reader V400 F050 250 350 Cat No Z242 E1 03...
Page 13: ...12 Introduction Contents V400 F050 250 350 User s Manual Introduction MEMO...
Page 85: ...84 Section 6 Troubleshooting V400 F050 250 350 User s Manual Section 6 Troubleshooting MEMO...