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Omron ZFV Series User Manual Page 55

Smart sensors with ultra-high-speed ccd cameras.
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Section 3
Executing Teaching
Item
CHARA*
CHARA 1
CHARA 2
* : This is displayed only when a standard type Amplifier Unit is in use.
About the teaching area for [CHARA]
For the teaching area when the printing position is out of position, set to an area in which the character
string might possibly be printed out of position. (Be sure, however, to set to an area having a plain
background.)
If an area very close to the character string without any margin is set, the sensor will not be able to
track any shift in the printing position.
Right
Any shift of the printing position inside the teaching area is judged as OK.
Wrong
When the teaching area is set very close to the character without any margin,
character protrudes from the teaching area and so this is judged as an NG.
ZFV
52
User's Manual
Description
Select this item to detect the presence of an entire character
string printed on a plain background.Judgment is performed
by comparing the changes in density (brightness) of a regis-
tered character string. Omission of characters, errors, miss-
ing dots, etc. cannot be detected.
Teaching area
Example)
NG as there is no character string
Select this item to detect omission of single characters.
Errors in characters, missing dots, etc. cannot be detected.
Teaching area
Example)
NG as "1" is missing
Example of Application
Detection of presence
of entire character
string such as the
"Best-before" date
Detection of missing
character in character
strings such as the
"Best-before" date

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