Optics: image projectors – Slide transfer mechanism – Slides fixed to movable carrier
Patent
1984-07-26
1986-12-09
Haroian, Harry N.
Optics: image projectors
Slide transfer mechanism
Slides fixed to movable carrier
G03B 2310, G03B 2316
Patent
active
046276963
DESCRIPTION:
BRIEF SUMMARY
The present invention is with respect to a projection apparatus for transparencies with at least two objectives, each of which has its own condensor and a projection lamp and furthermore a transparency that may be pushed into position between the condensor and the objective and the projection lamps may be controlled independently of each other. Projection apparatus of this sort is known and is used for producing so-called multivision programs with fading in and quick picture changes.
Known projection apparatus on these lines is very complex and has the shortcoming that it is hard to put the optical axes exactly into the desired position and to put the objectives in focus. Furthermore with such known projection apparatus there is a limit to the speed of changing the picture and to possible fading operations. In the known projection apparatus it is mainly a question of having a number of separate projectors with a roundabout or carussel magazine placed on top of each other or side by side in a frame and their optical systems are exactly pointed at the same part of the picture screen.
Although it is possible for known projection apparatus to be used for producing multivision displays and quick sequences of images, the lining up of the separate projectors forming parts of the projection apparatus is a very slow process. Because of the relatively large distances between the separate objectives of the projection apparatus the projected transparencies are not placed exactly in the right position in relation to each other, more specially at the edge parts, because the projectors are placed at different angles in relation to the picture screen. Seeing that furthermore the known projection apparatus has to have a separate transparency magazine for each of the projectors, and the transparancies of the magazine are moved automatically into the projector and taken therefrom, the known projection apparatus is very complex mechanically and different sorts of trouble conditions are likely therewith.
One purpose of the invention is that of designing a projection apparatus for multivision, in the case of which the shortcomings noted herein in connection with the known forms of apparatus are put an end to and the apparatus is of simple technical design and may be used for projecting in a rapid sequence a number of transparencies at the same time or one by one onto the same part of a picture screen. More importantly, a part of the purpose of the invention is designing a projection apparatus that is trouble-free even after being used for a long time and which may be used for projecting even the edge parts of pictures exactly and without distortion.
This purpose is effected in the invention by the system as defined in the characterizing part of claim 1.
In the projection apparatus in keeping with the present invention there is the useful effect that no time is needed for getting a number of different projectors ready for operation. The electronic control of the separate projection lamps may be made simpler, seeing that at one and the same time four to eight transparencies are ready for projection, and may be projected separately or with a fading effect by separate control or switching on of the different projection lamps. The placing of a number of transparencies in keeping with the invention on a transparency support gives the useful effect that the separate transparencies may be exactly lined up on the transparency support and may be rocked into place quite as exactly between the condensors and the objectives.
The projection apparatus in keeping with the present invention may be fitted with a translucent picture screen, that is placed at fixed, relatively small distance from the objectives. In this form of the invention the apparatus may be more specially be used in store windows, sales offices and the like where publicity material is projected.
The apparatus in keeping with the invention may however furthermore be used for projecting the transparencies onto a reflecting screen, in which case the distance between the screen p
REFERENCES:
patent: 3036496 (1962-05-01), Frederick
patent: 3841744 (1974-10-01), Rubin
Haroian Harry N.
Striker Michael J.
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