Optics: image projectors – Plural
Patent
1987-04-28
1988-05-03
Haroian, Harry N.
Optics: image projectors
Plural
353101, 353110, G03B 2310, G03B 2316
Patent
active
047416149
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention takes as its starting point a projector device comprising a group of at least four projectors for transparencies, which in accordance with the arrangement of projectors are arranged in groups of a plurality of sectors of a transparency carrier disk able to turn about its center, the lamps of projectors being arranged on a common lamp carrier, the condensors of the projectors being arranged on a common condensor carrier plate and the objectives of the projectors being arranged on a common objective carrier plate and the transparency carrier disk is able to be driven via a central drive shaft. Projection devices of this type have been proposed in the PCT/EP83/00318.
Known multiple projectors are so designed that the lamp carrier, the condensor carrier and objective carrier are combined as a single means using a bridge spanning the transparency carrier disk. In the case of such means it is hard to so locate the lamps, the condensors and the objectives that they keep their accurate adjustment even after a long period of use, after frequent transport and after other mechanical stresses. It is furthermore hard to so mount the transparency carrier disk and its drive in such a manner that the transparency carrier disk and its drive function accurately after heavy stresses.
SUMMARY OF THE INVENTION
The object of the invention is to provide a projector device with at least four and preferably six projectors which is so sturdy that it may be shipped without any special care being taken and is able to stand up to heavy mechanical stresses.
This object is attained in accordance with the invention inasfar as the condensor carrier plate forms the wall of a box-like rigid chassis consisting of cast metal, in which the lamp carrier is replaceably arranged and in whose walls there are mutually parallel holes for receiving the bearings of the drive shaft and to receive axially adjustable guide rods, on which the objective carrier plate is secured.
The rigid chassis in accordance with the invention has the effect that the lamps, which are precisely aligned in the lamp carrier in relation to the condensors, are reliably held in the chassis and that furthermore a precise and mechanically resistant bearing system for the drive shaft of the transparency carrier disk and for the guide rods of the objective carrier plate is obtained. At the same time, the chassis made of cast metal such as cast aluminum or gray cast iron, offers the advantage that it is able to take up and conduct away the heat given off by the lamps.
There are guide grooves in the longitudinal side walls of the chassis so that the plate-like lamp carrier may be slipped into the chassis like a carriage. A terminal abutment ensures the precise positioning of the lamps in relation to the condensors. Underneath the lamp carrier the longitudinal side walls of the chassis form a venting duct through which the air current produced by a fan is able to flow.
The transparency carrier disk is driven via the drive shaft by a motor, which is attached to the chassis. For raising and lowering the objective carrier plate there is a reciprocating rod, which is mounted in a wall of the chassis and which is able to be moved upwards and downwards by way of a setting mechanism.
The chassis is set in a plastic housing, which is shut off by a housing cover, in which there is a recess through which the chassis may be inserted into the housing. The condensor carrier plate is in this respect arranged in the plane of the housing cover. The transparency carrier disk is located above the housing cover and is protected from dust by a cover hood. The latter as well has a recess in which a bellows may be inserted, which connects the cover hood with the objective carrier plate and thus protects the transparency carrier disk against dust despite the adjustability of the transparency carrier plate.
The projector device in accordance with the invention may be fitted with a translucent picture screen, which is arranged at a set, small distance from the ob
REFERENCES:
patent: 4627696 (1986-12-01), Sacher
Haroian Harry N.
Striker Michael J.
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