6

BGS / FGS functions make even the most challenging settings possible!

The BGS function is best suited for the following case

The FGS function is best suited for the following case

Background not present

When object and background are separated

Background present

When object and background are close together

When the object is glossy or uneven

Not affected if the background

color changes or someone

passes behind the conveyor.

Unaffected by gloss, color

or uneven surfaces when

sensing objects present on

a conveyor belt.

Caution: Please use the FGS function together with a conveyor or other background

unit.

FGS (Foreground suppression) function

The sensor judges that an object is present when no light is

received at position B of the light-receiving element (2-segment

element). Accordingly, even objects that are glossy can be

sensed. This is useful if the object and background are close

together, or if the object being sensed is glossy.

Conveyor

Conveyor

Conveyor

Light received at

position A

Light is not received

at position B, so an

object is judged to

be present

Light received at

position B

A

Lens

Emitting

element

Object present

For glossy object

Object absent

ON

ON

OFF

B

OFF in this condition only

ON in all other conditions

Setting

distance

A conveyor or other

back-ground must

be present

(

)

BGS (Background suppression) function

The sensor judges that an object is present when light is received

at position A of the light-receiving element (2-segment element).

This is useful if the object and background are far apart. The

distance adjustment method is the same as the conventional

adjustment method for adjustable range reflective type sensors.

Setting distance

Object

Moving object

in the back

ON

OFF

Element B

Element A

Light received at

element B, or

light not received

(

)

(

)

Light received

at element A

Detects minute objects unaffected by glossy

background objects. Uses FGS function.

Stable sensing even for thin objects. Uses

FGS function.

Not affected by color variations in objects and

background objects. Uses BGS function.

Applications

■ Small tablet detection

■ Thin biscuit detection

■ Passage confirmation

CX-443

CX-442

CX-441

BGS

FGS