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User Manual HS-50 6 Vision functions Software-Version 5.01Edition 01/99 6.2 PCB vision system 185 .H\W R)LJ (1) MV S 340 vision analy sis uni t, gantri es 1 and 4 (2) MV S 340 vision analy sis uni t, gantri …
6 Vision functions User Manual HS-50
6.1 The vision systems on the placement system Software-Version 5.01 Edition 01/99
184
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User Manual HS-50 6 Vision functions
Software-Version 5.01Edition 01/99 6.2 PCB vision system
185
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(1) MVS 340 vision analysis unit, gantries 1 and 4
(2) MVS 340 vision analysis unit, gantries 2 and 3
(3) Video multiplexer
(4) Position of the control unit
(5) X6st: Component and PCB camera, gantry 1
(6) X7st: Component and PCB camera, gantry 2
(7) X6su: Component and PCB camera, gantry 3
(8) X7su: Component and PCB camera, gantry 4
(9) X5st: Image output (VGA) for plug X3sv (video multiplexer)
(10) X5su: Image output (VGA) for plug X4sv (video multiplexer)
The electronic image signals from components, PCB fiducials and feeder module fiducials can be
transferred from the vision analysis units via the video multiplexer to the two station monitors,
where they are used for measuring and testing purposes.
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The PCB vision system records the precise position of the PCB by measuring fiducials, and cal-
culates the offset in the x and y directions, the angle of rotation relative to the PCB transport di-
rection and the shear acting on the PCB. Reject fiducials (ink spots) are also recorded and
analyzed by the PCB vision system.
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The PCB vision system for detecting the position of PCBs consists of the optical PCB position de-
tection system and the vision analysis unit
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Each gantry has a separate PCB position detection system (see Fig. 6.1 - 3 on page 6 - 182).
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The control unit of each placement system contains two analysis units for detecting the position
of PCBs and components (see Fig. 6.1 - 4 on page 6 - 184).
A CCD camera (SONY XC75) with integral mapping and illumination lens forms the optical PCB
position detection system. The field of view of the PCB module is 5.7 mm x 5.7 mm. The size and
6 Vision functions User Manual HS-50
6.2 PCB vision system Software-Version 5.01 Edition 01/99
186
position of the search field can be programmed as required within the fields of view. The mapping
lens is a special measuring lens which corrects most errors caused by the curvature of the PCB.
The illumination is switched on only while fiducials are being recorded.
The vision analysis unit (MVS) is a single-board system conforming to VME standards. The hard-
ware consists of
– the MVS motherboard with vision processor and interface connections
– and the MVS camera interface for up to four CCD cameras.
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The two VME bus connections are located on the back of the VME module.
The front panel of the VME module contains connectors for
– the monitor (VGA mode, 15-pin SUBD connector)
– the high-speed interface (HS
3
L), 9-pin SUBD connector
– up to 4 camera inputs (2 x 15-pin SUBD connector)
– two serial interfaces (RS232 for COM1 with a 25-pin SUBD connector and COM2 with a
9-pin SUBD connector)
– trigger and flash signals (10-pin ribbon cable connector)
and status display LEDs for
–the CPU (CFG)
– the vision processor (ACA)
– the camera input (BCA)
– the screen display (DISP)
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Camera model: SONY XC75
Number of pixels: Camera 768 (H) x 494 (V), Image 640 (H) x 484 (V)
Field of view: 5.7 mm x 5.7 mm
Illumination method: Incident light method (activated during measurement)
Image processing: Correlation principle, gray scale system
Processor cycle time: < 200 msec
Screen: RGB monitor (VGA mode) 640 x 484 pixels in the station computer
Fiducials: Library memory for up to 255 fiducial definitions