1OM-1064-002.pdf - 第74页

Picked Component Captured Im age on Recognition Monitor Placed Component View from Front Side of Machine View from Rear Side of Machine 3 2 4 1 2 3 1 4 1 4 2 3 1 4 2 3 2 3 1 4 1 4 2 3 • The recognition system (back light…

Recognition Method

Applicable Component Size

Image Scanning

Method

Lighting to be

Used

Small View Large View Maximum View

Front Lighting

1.0 × 0.5 to

23 × 15 mm

2.0 × 1.2 to

46 × 34 mm

2.0 × 1.2 to

46 × 46 mm

Batch

Back Lighting

1.0 × 0.5 to

23 × 15 mm

2.0 × 1.2 to

36 × 35 mm

2.0 × 1.2 to

36 × 36 mm

Divided Front Lighting

Max. 55 × 55 mm Max. 55 × 55 mm

Note

Max. 55 × 55 mm

Note

6. Outline of System Operation

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(3) Front Lighting (BGA) System

Fig. 1.20 shows the sectional view of the recognition unit and the flow of

the recognition light in the front lighting (BGA) system.

Fig. 1.20

The light emitted from the front lighting for BGA meets the balls, etc., on the

bottom of the BGA component. The reflected light enters into the CCD cam-

era through the monocular. The captured images look like doughnuts. That is,

the CCD camera can be used to detect where the BGA balls are located or

whether or not the balls exist.

Supplement:

• One of the three fields of view can be selected for the component recogni-

tion camera.

Two cameras are installed on each beam. (4 cameras in total)

As a standard combination of cameras, four large view cameras are recom-

mended.

Note: In the case of the connector, this recognition can be applied to Max.

150 × 26 mm.

Table 1.5

Picked Component

Captured Image on

Recognition Monitor

Placed Component

View from Front Side

of Machine

View from Rear Side

of Machine

• The recognition system (back lighting, front lighting, or front lighting (BGA)

system) can automatically be selected according to the component library

data.

• Component Recognition Coordinates System

The image of the component (state of picked component based on the X/Y

beam movement) on the recognition monitor looks like those depicted be-

low.

View from Front Side of Machine:

The captured image of the picked component on the recognition

monitor is inverted horizontally, compared with the posture of the

picked component. Therefore, when the X/Y beam moves from left

to right, the image of the component moves from right to left on the

recognition monitor.

View from Rear Side of Machine:

The image of the component on the recognition monitor is inverted

vertically, compared with the posture of the picked component. There-

fore, when the X/Y beam advances from up (front side of machine)

to down (rear side of machine), the image of the component on the

recognition monitor moves up.

6. Outline of System Operation

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Table 1.6

• P.E.C. Recognition Coordinates System

The posture of the placed component matches the image on the recognition

monitor.

Special attention is required to the direction keys for the screen movement

made when the manual axis operation is performed on the front side of the

machine because the CCD camera moves together with the X/Y beam.

The directions of the X/Y beam movement and the fiducial mark movement

on the recognition monitor are inverted (upside down, leftside right).

The directions are not inverted when the machine is operated on the beam A

side.

6. Outline of System Operation

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Direction of X/Y

Beam Movement

Direction of Mark Movement on

Recognition Monitor

Operation on Beam

A Side

Operation on Beam

B Side

6.2.3 Correction of Recognition

Theta (Angle) Correction

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

ment specified in the pattern program by rotating the head.

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

tion is also corrected.

Component Placement

(1) The X/Y beam moves.

The X/Y beam is moved to the coordinates (position on P.C.B.) specified

in the pattern program.

At this time, the measured positional deviation (X, Y) between the cen-

ters of the recognition camera and the component is corrected during the

X/Y beam movement.

(2) The placement Z correction is made.

The lowest limit in nozzle height is controlled based on the component

library data when components are placed.

(3) Vacuum turns off, air blows out from the nozzle, and components are

placed on the P.C.B.

Table 1.7