10
Video Camera and Optical Alignment System: (Figures 17 & 18)
A video/optical system aids the operator in aligning the nozzle or component to the board. To use the
alignment system, put the head in the UP position, and slide the optics train (10) to its right-most
position underneath the nozzle. Top lighting (1) illuminates the component and/or the end of the nozzle
and vacuum tip. Bottom lighting (2) illuminates the board. Light reflected from the component and
board travels through the beam-splitting prism (3), reflects off the flat mirror (4), into the zoom lens (9),
and finally onto the CCD imaging device (8). The CCD imaging device transmits a video signal to an
LCD flat screen, an analog monitor, or a PC for high magnification viewing of the superimposed
component/board image. The intensity of the component or board image can be adjusted by varying the
light intensity. The image is adjusted using the focus (5), zoom (6), and f-stop (7) controls on the zoom
lens (9). Always focus the camera on the BOARD and adjust the Z height of the component or nozzle to
focus the top image. When focusing a component, adjust the Z height of the component so that the pitch
of the leads on the component matches the pitch of the in-focus pads on the board. This is easiest when
the X/Y/Theta adjusts are used to set the leads on the component parallel to, and one-half pitch offset in
the Y direction from the pads on the board.
Figure 17: Optics Components
Figure 18: Camera & Zoom Lens
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Содержание FR-1418
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