The opaque projector displays non-transparent materials by shining a bright lamp onto the object from above. The first projector used as a presentation device was not the overhead but the opaque projector. As a result the overhead projector continues to be a popular presentation accessory. Critics feel that these newer systems are more expensive, much more prone to failure and have a steeper learning curve than the traditional overhead projector. Increasingly overhead projectors are being replaced by larger computer monitors or LCD projectors. Overhead projectors were once a common fixture in most classrooms and business meetings. The mirror allows both the presenter and the audience to see the image at the same time, with the presenter looking down as if writing and the audience viewing the screen. The light from the lamp travels though the transparency and into the mirror where it is reflected onto a viewing screen. Page sized sheets of transparent film are placed on top of the lens for display. Above the box, typically on a long and folding arm, is a mirror that redirects the light forward instead of up. Overhead projectors typically consist of a large box containing a very bright light-source, a fan for cooling the box, and a large lens that focuses the light. Simply stated, an overhead projector displays images to an audience. Let’s start with an explanation of what overhead projectors are and what overhead projectors do. To help you decide we put some of the best in class to the test. The question is which overhead projector is right for you? Available Buhl and 3M overhead projectors give you a wide range of choices to supplement almost any presentation. Overhead projectors combine an old technology with new technology options to create machines which are both reliable and versatile. Features to Consider Before Purchasing an Overhead Projector
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