Opaque Projectors

Before the overhead projector was introduced, the popular type of projector used was the opaque projector. Also know as epidioscope or episcope, the opaque projector is used to view images of non-transparent materials like drawings, book pages, leaves, mineral specimens, printed sheets and other materials of interest. It uses a system of mirrors and imaging lenses designed to focus the image of the opaque material onto the screen. Due to the nature of the materials that are used to be viewed using it, the opaque projector requires a brighter light bulb and larger lenses than the overhead projector.

Opaque Projectors

Opaque Projectors

This type of projector is not as common as the modern projectors. It was primarily marketed and developed as an enlargement tools for artists, allowing images to be transferred to larger surfaces to be used in discourses and lectures. The production and use of the opaque projector has now declined; however, some manufacturers are still making this type of projector in small scale.

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