Projector for writing foils and opaque originals

摘要

The invention relates to a combination projector which is equally suitable for writing projection and episcopic projection. It is the object of the invention to save production costs and invent a practical, didactically sound projector. The invention is characterised in that the two projection processes require only one lens which is attached to a swivellable column (1). Attached rotatably to the projection head is a mirror which is swivelled upwards by a weight, thereby clearing the beam path, when the column (1) is brought into the episcopic position. At the same time, the illumination is switched over by the nose (15), and a lever (18) presses the adaptor tube (8) via the leaf spring (17) against the projection head, while the shutter (19) clears the beam path. When swivelling back takes place, the weight presses the mirror against a setting arm, so that the mirror setting corresponds in the case of writing projection to the initial position. The advantages reside in a very good price/performance ratio, since in each case only one lens, cam shaft, motor and transformer are required. Manipulation is easier than when two projectors are used. IMAGE