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Light source Optics Aperture wheel Shutter
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FIGURE 18.8 A photo plotter uses a stationary light source to deliver light through a rotating variable size aperture wheel (which determines the size of the light spot on the table) onto a table that can move in the x and y directions. A shutter shuts or allows light passage as required. Precision optics control the focus of the light spot.
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A common problem with both Gerber 274D and drill formats (usually Excellon I and II) is the lack of definition of both units and scale factor of numbers (Excellon is a precision drill machines manufacturer). Each coordinate is given as a collection of digits, and the translator, or user, must define the units (in in. or mm) and the location of the decimal points in the format. Another problem stems from the use of arbitrary numbers ( Dcodes for aperture numbers on an aperture wheel) to describe the width of lines and size of pads.Accurate translation of these files depends on the correct definition of an aperture wheel, which is described separately. Figure 18.8 shows a photo-plotter schematic that explains the source of the terminology. The commands that drive this mechanism are x and y coordinate movement commands to position the table, those that turn the shutter on and off, and Dcode commands that rotate the aperture wheel to the required position. Gerber 274X was designed in the early 1990s (by a team of two engineers one from Gerber Scientific and another from what used to be the biggest PCB factory in the United States, the AT&T plant in Richmond, Virginia) to overcome some Gerber 274D problems. Gerber 274X permeated slowly at first, but its adoption accelerated and Gerber 274D is now used less frequently. Both 274D and 274X are used to transfer graphic images of circuit and mask layers and images of documentation layers used for instructions. Other graphic drawing formats are occasionally used to transfer board and drawing data. The most common formats are HPGL (the format of HP pen plotters) and DXF (the AutoCAD exchange format). Several drill formats originating from drill machine makers other than Excellon (Sieb and Mayer, Posalux, etc.) are sometimes used to transfer drill data or to archive old drill data.They suffer from the same problems of Dcode (explained in Fig. 18.9) and unit definition. 18.3.2.1.1 Gerber 274D. Gerber RS-274-D has been the most common format for describing PCB plot data. This format was originally intended to drive vector photo plotters (see Fig. 18.8), produced by Gerber Systems Corporation (see Fig. 18.9 for an annotated snapshot section of a Gerber file).
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G90 indicates absolute coordinates. This means that that each set of coordinates is referenced to the table s origin (0,0).The converse to absolute is incremental; each coordinate is measured relative the previous coordinate value and is set by issuing the G91 command. G70 indicates inch units. G54, tool select (line 3), is the most commonly encountered Gcode and instructs the plotter to rotate the aperture wheel to the position described by Dxx immediately following the G54 command. If this code is omitted, the the photo plotter then identifies the next Dxx command as telling it to select a tool. Dcodes are instructions to the photo plotter that, naturally, include the letter D. The first three Dcodes control the movement of the x,y table. D02 (D2) tells the plotter to move to the x,y location specified with the shutter closed. D01 (D1): This command tells the plotter to move with the shutter open to the x,y location specified. D03 (D3): This command tells the plotter to move with the shutter closed to the x,y location specified, then open and close the shutter known as flashing the exposure.
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X450Y330D01* .X455Y300D03* G54D11* Y250D03* Y200D03* Y150D03* X0Y0D02* M02*
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