Sekonic SR-2300, Manual, Page: 58 / 70

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OMR glossary
Timing control type
If paper has pre-printed timing marks, the scanning area (reading area) of targeted
mark frames will be determined by such timing marks.
Timing control type is a method to determine the reading zone based on the timing
mark width. Other methods include direct under type, mark to mark type, and FACOM
type.
Example: Timing control type to scan three times the timing mark width.
Set multiple numbers using the software controlling OMR.
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Reading area
N times the width of
a timing mark
Reading area
N times the width of
a timing mark
• Top-end timing control type:
Reads n times the width of a timing mark
from the beginning of the timing mark.
• Bottom-end timing control type:
Reads n times the width of a timing mark
from the end of the timing mark.
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Sensor (for reading) Reading sensor/position sensor
Sensors are photoelectrical elements that transform reflected light. We use photo
interrupters as reading sensors, so illuminating LEDs is also included. Sometimes
sensing refers to both light emission and light reception. Sometimes types that include
bar lenses are referred to as sensors.
LED wavelength influences dropout color. We use mainly three wavelengths, and
the relationships between wavelength, dropout colors, and readable colors are shown
in the table below.
Sorter
On a device with two or more stackers, this is a unit that can sort paper based on
information such as kind of paper and written marks.
Wavelength Color Dropout color Readable color
940nm Infra red
Colors other than
Black and blue pigments
readable colors
660nm Visible light (red) Red, orange, pink Black, blue
570nm
Visible light
Yellow, green Red, blue, black
(greenish yellow)