Panasonic Digital Mark Sensor LX-101

Automatic optimal LED selection function

The 3 colors of the R•G•B LEDs are
optimally selected according to the color
combination. With the LX-100’s Mark mode,
the built-in “Automatic optimal LED selection
function” automatically selects the LED for
the largest contrast (S / N ratio) between the
mark and base (non-mark area) to ensure
optimal sensing. For more stable detection,
the sensor makes selection according to the
contrast and not according to the reflected
light variation between the mark and base
(non-mark area).
The example on the right deals with reflected light
on packing film.
Great figures are indicated for the blue LED’s light
amount ratio and, for even more stable sensing,
the blue LED effectuates this mark sensing.

Two detection modes can be selected from to suit the application

Mark mode Ultra high-speed response
This sensing mode automatically selects
a single color from the 3 R•G•B LEDs to
achieve an ultra quick 45 μs response
time. The automatic optimal LED
selection function automatically selects
the LED that is most suitable for the
sensing. This function is perfect for ultra
quick sensing.

Color mode High precision discrimination
All 3 R•G•B LEDs light up and high
precision mark color discrimination
occurs using the R•G•B reflective light
ratio. This function enables effective
detection of films with patterns around
the area of the mark.

High precision mark color discrimination
The color mode on the LX-100 series utilizes all 3 R•G•B LEDs to determine the R•G•B ratio of the mark color.
The built-in 12-bit A/D converter enables high precision 1/4,000-resolution judgments. The figure below is a graphic
description of this process.