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overhead projector optical stage optical lens projection head mirror

overhead projector click to hear : overhead projector

Device that projects the enlarged image of a document printed on a transparency on a screen located behind the user.

optical stage click to hear : optical stage

Glass plate that is lit by an internal light; the document to be projected is placed on it.

optical lens click to hear : optical lens

Transparent optical disk that captures the light from the optical stage and makes it converge toward the mirror.

projection head click to hear : projection head

Movable part that contains the lens and mirror; a focusing ring changes its position to give a clear image on the screen.

mirror click to hear : mirror

Polished glass surface that directs light from the lens toward the projection screen.