Photo-plotters are of two types:

            · Vector Photo-plotter (generally with usual source light) - ADMAP, ARISTO, QUEST.

            · Laser Photo-plotter - LASERGRAPH (Hungary), GERBER, ITEX.

There are two types of plotting:

·FLASH

· DRAW

At the old types of photo-plotters, the aperture disk was a physical one.

 

Disadvantages:

-         Too much time for plotting (8 hours for A4).

-         Limited numbers of apertures (generally 24).

-         Limited number of apertures size.

-         For unsymmetrical pads rounded plotting requires a new aperture.

Advantages:

-         The flash plotting was perfect due to physical disk.

-          Eliminating digitization by a convenient realizing of plotted areas.