Optics: image projectors – Picture carrier
Patent
1977-03-31
1979-02-13
Stephan, Steven L.
Optics: image projectors
Picture carrier
33389, 353 40, 353121, 353122, G01C 924, G03B 2154
Patent
active
041392876
ABSTRACT:
A slide body of a rigid transparent material is sized to be received within a slide transparency projector. The slide body includes a bubble level indicator having a narrow arcuate chamber which is filled with a liquid to create a bubble of air trapped within a band of fluid. The bubble is displaceable within the arcuate chamber and remains at the highest point therein. When the slide is level, the bubble rests at the mid-point of the band. The slide body is also provided with a pattern of concentric rectangles and a pattern of markings to indicate the extent of deviation of the bubble from its position at the mid-point of the band. The arcuate band, bubble and pattern of markings are projected onto the screen by a projector to permit a projectionist to readily ascertain whether or not the projector is in focus and is level. The projector can then be focused and leveled by adjusting the focusing and leveling system of the projector.
REFERENCES:
patent: 3843244 (1974-10-01), Facchini
patent: 3894342 (1975-07-01), Goode
LandOfFree
Projector leveling and focusing aid and method of using same does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Projector leveling and focusing aid and method of using same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Projector leveling and focusing aid and method of using same will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-688703