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User Manual HS-50 6 Vision functions Software-Version 5.01Edition 01/99 6.1 The vision systems on the placement system 179 9 LVLRQIXQFWLRQV 7KHYLVLRQV\ VWHP VRQWKHSO DFHPHQWV\VWH P The quality requir ements …
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User Manual HS-50 6 Vision functions
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The quality requirements concerning the accuracy of automatic placement systems are constantly
rising, for several reasons:
– continuing miniaturization of components,
– increasing lead connection density,
– increasing complexity of PCBs and
– increasing component density.
To help meet these requirements, high-precision mechanical components are combined with op-
tical centering and detection systems (known as vision systems) for components and PCBs.
The placement system has four gantries (see Fig. 6.1 - 1). On each of these gantries there is a
DLM1 revolver head with a separate component camera system (see Fig. 6.1 - 2). A PCB camera
system is mounted on the underside of the head mount of each gantry (see Fig. 6.1 - 3).
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6 Vision functions User Manual HS-50
6.1 The vision systems on the placement system Software-Version 5.01 Edition 01/99
180
(1) Gantry 1 with DLM1 revolver head and component and PCB vision system
(2) Gantry 2 with DLM1 revolver head and component and PCB vision system
(3) Gantry 3 with DLM1 revolver head and component and PCB vision system
(4) Gantry 4 with DLM1 revolver head and component and PCB vision system
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The two vision analysis units plug into the control unit (see items 1 and 2 in Fig. 6.1 - 4). The com-
ponent and PCB cameras, combined with the vision analysis units form the vision system.
The electrical image signals from the component and PCB camera systems are sent to the vision
analysis units (see items 1 and 2 in Fig. 6.1 - 4), where the measured values are compared with
the artificial values from the component description or PCB fiducials. The result is used to calcu-
late the correction factors for the individual placement positions.
The components are also identified by their package forms. The component is not placed if the
artificial model and the package form measurement do not correspond.
The PCB vision system can also be used to detect the position of the feeder modules. Fiducials
on the feeder modules are used to calculate the position deviation of individual feeder modules.
The pick-up reliability can be greatly increased in this way, even for tiny components.
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The component camera system (see item 2 in Fig. 6.1 - 2) essentially consists of the following
modules:
– Lens system
– CCD chip for creating an electronic image of the component
– CCD camera amplifier
– Three illumination planes - flat, medium and steep - for optimum lighting of a wide range of
component shapes
– "Illumination control" board for setting the intensity of the individual illumination planes