Projection Devices, Continued
Nomenclature
An opaque projector is an indirect projection system that uses a composite of
highly polished mirrored surfaces to reflect light from an object through a
lens onto a screen. Other parts of the opaque projector include an on/off
switch, a high intensity 1,000 watt bulb, an optical pointer, a focusing knob,
a roll feed assembly, a platen assembly, and a fuse holder. Most parts and
their functions are self-explanatory except for the roll feed assembly and the
platen assembly.
ROLL FEED ASSEMBLY: The roll feed assembly works like a conveyor
belt to slide objects into the projection platform. Located on the platen
assembly, it permits movement from left to right when you turn a hand crank
on the side of the machine.
PLATEN ASSEMBLY: The platen assembly raises and lowers the
projection platform. By raising and lowering the platform, you can project
objects up to 1 ½ inches thick. The lock on the platen assembly is spring-
loaded; therefore, carefully lock and unlock the platen to prevent the
projection platform from snapping up.
Continued on next page
5-6
