1OM-1626-001_w.pdf - 第88页
1OM-1610 3. Mechanism for Surface Mounting : Chap.1 1-31 091 1-001 The back and front lighting recognition systems are prepared for component recognition. Either one of them is selected automatically according to the lig…
1OM-1610
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3. Mechanism for Surface Mounting : Chap.1
0911-001
3.9 Component Recognition Section
Each beam has a component recognition camera and a light source for
illumination within its coverage area. The camera and the light source are used to
inspect (recognize) the component picked up by a vacuum nozzle.
Hood
(for BGA components)
F1A23
Notice
Do not stain the component recognition camera protective glass. Doing
so might lower the recognition accuracy.
Reference
When the protective glass becomes dirty, refer to "3.3.3 Recognition Camera
Unit" in Chapter 1, Volume 4.
The machine is provided with front and back lighting systems. In the front
lighting system, the bottom surface of a component is illuminated directly from
under the component and the reected image is captured (both ring and coaxial
lamps are used together). In the back lighting system (ring lamps), the diffusion
plate is illuminated from under the plate and the penetrated image of a component
is captured. Either one of the systems can be selected according to the components
being used.
1OM-1610
3. Mechanism for Surface Mounting : Chap.1
1-310911-001
The back and front lighting recognition systems are prepared for component
recognition. Either one of them is selected automatically according to the
lighting mode specied in the component library data.
(1) Front Lighting Recognition System
The gure below shows the sectional view of the recognition section in the
front recognition system and the ow of the lights for the recognition.
An appropriate lighting mode (by using the 1, 2, or 3 lamp as front lighting) is
determined for component recognition.
Vacuum nozzle
Components
Back Lighting
Front Lighting 3
(BGA Lighting)
Front Lighting 1
Front Lighting 2 (Coaxial Lighting)
CCD Camera
Scope
Diffusion Plate
F1A24
The lights emitted from the 1, 2, or 3 lamps for front lighting meet the bottom
surface of the component.
The reected lights go into the CCD camera through the monocular. That is,
the CCD camera captures the leads, etc., of the component.
Example : Captured Image for Recognition
F1A25
Short Appendix : Principle of Component Recognition
1OM-1610
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3. Mechanism for Surface Mounting : Chap.1
0911-001
(2) Front Lighting Recognition System (For BGA Components)
The gure below shows the sectional view of the recognition section in the
front lighting recognition system (for BGA components) and the ow of lights
for the recognition.
Vacuum nozzle Components
Back Lighting
Front Lighting 3
(BGA Lighting)
Front Lighting 1
Front Lighting 2 (Coaxial Lighting)
CCD Camera
Scope
Diffusion Plate
F1A26
The light emitted from the lamp for front lighting 3 meets the balls located on
the bottom of the BGA component.
The reected light goes into the CCD camera through the monocular.
The captured image of the balls looks like a doughnut. That is, the CCD
camera captures the image of the balls to determine where the balls are located
or how the balls are arranged (missing balls, etc.).
Short Appendix : Principle of Component Recognition (Continued)