2OM-1075-002.pdf - 第59页

Component Storage Box: Component Discharge • When a recognition error occurs during the component recogni- tion, the head moves to the component storage box and discharges the error-caused component. Fig. 2B15 Component …

(3) Front Lighting Recognition System (For BGA Components)

The figure shows the sectional view of the recognition unit and

the flow of recognition light in the front lighting recognition

system (for BGA components).

Fig. 2B14

The light emitted from the front lighting (upper) reflects to the balls lo-

cated on the bottom of the BGA component.

The reflected light enters into the CCD camera through the monocular.

The captured images look like doughnuts.

That is, the CCD camera is used to detect where the BGA balls are or

whether or not the balls exist.

• Correction of Recognition

Theta (Angle) Correction

The picked component is adjusted to the angle (placement direction) of

placement specified in the pattern program by rotating the head.

At this time, the angular deviation (θ) detected through component rec-

ognition is also corrected.

0206-003 2 -9

AHB01ESPP

1.2 Component Placement (starting with preparation for component picks)

Ball

Front Lighting (Lower)

Front Lighting (Center)

Fixed Back Lighting

Component Recognition Camera

BGA Component

Nozzle

Diffusion Plate

Focused Plane

Front Lighting (Upper)

(CCD Camera)

Monocular

Component Storage Box: Component Discharge

• When a recognition error occurs during the component recogni-

tion, the head moves to the component storage box and discharges

the error-caused component.

Fig. 2B15 Component Discharge

0206-003 2-10 AHB01ESPP

1.2 Component Placement (starting with preparation for component picks)

1.2.4 Component Placement

P.C.B. Positioning Section: Component Placement

• The heads move to the area over the placement coordinates on the

P.C.B. specified in the pattern program.

The deviation (X, Y) of the pick-up position (measured through the

component recognition) is also corrected at this time.

Fig. 2B16 Movement to Area over Placement Coordinates

• When a component is placed, the lowest limit of the required nozzle

is controlled according to the component library data.

• The vacuum valve closes, air blows out from the nozzle, and the

component is placed on the P.C.B.

0206-002 2-11

AHB01ESPP

1.2 Component Placement (starting with preparation for component picks)