| 摘要 |
A transparency projector in which the housing is formed with an airflow passageway therethrough and a normally horizontal transparency support deck above the airflow passageway. The deck is formed with a projection aperture through which light is directed from within the housing to project the image contained on a transparency positioned over the projection aperture and a fan is supported within the housing to project the image contained on a transparency positioned over the projection aperture and a fan is supported within the housing to move air through the airflow passageway. The moving air is directed by walls positioned in the airflow passageway through a venturi-type path with its throat between a first lens and the projection aperture to create a partial vacuum below the projection aperture when a transparency is over it to locate and cool the transparency during projection thereof.
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