1OM-1064-002.pdf - 第71页

6. Outline of System Operation 9910-001 1-41 Tg0246-PM-OP 6.2.2 Principle of Recognition (1) Back Lighting Recognition System Fig. 1.16 shows the sectional view of the recognition unit and the flow of recognition light i…

Component

Vacuum Nozzle

Center of Component

6. Outline of System Operation

9910-001 1-40 Tg0246-PM-OP

6.2 Component Recognition

6.2.1 Scope

The machine is provided with three component recognition systems - “Back

Lighting Recognition System”, “Front Lighting Recognition System”, and

“Front Lighting (BGA) Recognition System”. The lighting method specified

in the component library is automatically selected.

The component recognition function is used to recognize the following three

items.

• Component Detection

All components can be detected.

• Component Inspection

Each inspection is made according to the component library.

• Measurement of Positional Deviation (X, Y) and Angular Deviation (θ)

between Centers of Recognition Camera and Component

Fig. 1.15 State of Component Picked Up by Vacuum Nozzle

Flow of Component Recognition

The component recognition is made using the component recognition camera.

↓

Angle correction is made.

↓

A component is placed on the P.C.B.

Fig. 1.15-1 Positional Deviation X, Y Fig. 1.15-2 Angular Deviation

θθ

(deviation in correct direction)

6. Outline of System Operation

9910-001 1-41 Tg0246-PM-OP

6.2.2 Principle of Recognition

(1) Back Lighting Recognition System

Fig. 1.16 shows the sectional view of the recognition unit and the flow of

recognition light in the back lighting recognition system.

• As for component (a) shown by the dotted line, the outline is recog-

nized through transmission head lighting.

• As for component (b) shown by the diagonal lines, the outline is rec-

ognized through transmission fixed lighting.

Fig. 1.16

The light emitted from the transmission head lighting meets the diffusion plate

(assembled together with the nozzle) and reflects to the component. At this

time, the light which does not meet the component enters into the CCD camera

through the monocular.

The light discharged from the transmission fixed lighting goes through the

diffusion plate and meets the component. The light which is not interrupted by

the component enters into the CCD camera through the monocular.

That is, the CCD camera captures the image of the outline of the component.

Fig. 1.17 Image (Example) on Recognition Monitor

9910-001 1-42 Tg0246-PM-OP

6. Outline of System Operation

(2) Front Lighting Recognition System

Fig. 1.18 shows the sectional view of the recognition unit and the flow of

the recognition light in the front lighting recognition system. Select the

proper lighting system, using the front lighting lamps (upper, middle, and

lower) for component recognition.

Fig. 1.18

The light emitted from the front lighting lamps (upper, middle, and lower)

meets the bottom of the component.

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

That is, the CCD camera captures the image of the component leads, etc.

Fig. 1.19 Image (Example) on Recognition Monitor