Masking device for use with image projectors

Details Masking device for use with image projectors Masking device for use with image projectors

1990-03-05

1992-06-16

Haroian, Harry N.

Optics: image projectors

Shutter

353122, 353DIG3, 353 97, G03B 2114

Patent

active

051219840

ABSTRACT:
A masking device is provided for use with projectors, such as an overhead projector, to selectively block the projection beam that carries an image disposed on a substrate, such as a transparency, for projection onto a viewing screen. The masking device has a framework having preferably guide rails that form slideways receiving a shutter panel. A transparency is aligned by the guide rails and the shutter panel has a leading edge that extends transversely across the aligned transparency so that only the image portion forward of the leading edge is projected. The shutter panel is constructed of a material that inhibits the projectiton beam, but allows the projection to read or view the image portion that is blocked. A base plate of transparent material supports the guide rails and provides a stage on which the transparency may be positioned for projection of the image disposed thereon. Adjustably mounts to retro-fit the masking device on various projectors is described, but the device could be made integrally with the projector.

REFERENCES:
patent: 2147260 (1939-02-01), Lewis
patent: 2357593 (1944-09-01), Leavell
patent: 3269261 (1966-08-01), Porter
patent: 3531193 (1970-09-01), Diehl
patent: 3661449 (1972-05-01), Wright
patent: 3881815 (1975-05-01), McGourty
patent: 4523823 (1985-06-01), Roope
patent: 4609268 (1986-09-01), Crawford
patent: 4688911 (1987-08-01), Simbal
patent: 4813780 (1989-03-01), Solyntjes

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