Glass stages for overhead projectors and an overhead type projector system containing such glass stages.

摘要

A glass stage for use in an upper stage in an overhead type projector comprises a rectangular frame body (23) having substantially the same dimension as that of the lower stage (5), a lower transparent plate (1) fixed to the rectangular frame body (23), and an upper transparent plate (25) adapted to push a strip film onto the lower transparent plate (1) rotatably supported by brackets (26) provided on the rectangular frame body through hinge pins (29) projecting sidewisely from the upper plate (25). Each of the brackets (26) is provided with a longitudinal hole (30) which engages with the hinge pin (29) for guiding movement of the upper transparent plate (25) in a drawing direction thereof. The longitudinal hole (30) is provided with a portion inclined downwardly at an end of a pushing side of the upper transparent plate (25), and the rectangular frame body (23) is provided at one of side portions thereof with small holes (28) through which the upper stage-fitting pins (9) are to be snugly fitted. The glass stage may comprise a rectangular frame body (23) having a lateral dimension greater than that of the projector body (2). In this case, an upper transparent plate (25) is freely openably hinged to the rectangular frame body (23) and adapted to push a long strip film onto the lower transparent plate (1), and in this embodiment the rectangular frame body (23) is provided with a pair of enlongated holes (28<1> Fig. 6) at a front side portion thereof. The elongated holes (28<1>) are adapted to fit to the upper stage-fitting pins (9), and each of the elongated holes (28<1>) has a length not smaller than that of a projecting width of the rectangular frame body (23) from the projector body (2).