Carl Zeiss Jena Gmbh

Young Optics Inc.

Sypro Optics Gmbh

Gudrun Schroeter

Gertrud Blei

Dietrich Schmidt

Eberhard Piehler

Christfried Symanowski

Guenther Benedix

Rainer Fischer

Thomas Maack

The invention relates to a rear project device, comprising a screen, projection optics, and an image module for generating an image, which is projected from the rear onto the screen by means of the projection optics, so that an observer located in front of the screen can perceive the image projected onto the screen. Furthermore, a method for such a rear projection apparatus is described. To this end, a Fresnel mirror, or an aspherical mirror, is used.

Rear projection apparatus and method for a rear projection apparatus

A projector for projecting light onto a projection surface includes a first group () with a negative meniscus, a second group () with positive refractive power, a third group () with a single lens, a fourth group () with a lens with positive refractive power, and a field lens () with positive refractive power, such that the light passes through the projection objective from the fourth to the first group. In order to be provide a high image quality with a small number of optical components and the smallest dimensions, the projector is configured so the common focal width of the fourth group () and the field lens () is smaller than twice the image circle diameter () of the projection objective and the maximum free diameter () is smaller than the overall focal width, and in particular smaller than 0.8 times the overall focal width of the projection objective.

Projection objective having four groups for projecting light onto a projection surface and a projector including the projection objective

An arrangement for projecting a multi-color image, including at least two image-generating elements which enable generation of one partial color image each of the multi-color image, and a color combiner which superimposes the light partial beam paths and emits it as a common beam. The arrangement further includes projection optics. The image scales being different for the partial color images, one optical device each is arranged in one or more of the partial beam paths of the partial color images whose image scales differ and each optical device is configured such that, due to the change in the image scale of the corresponding partial color image effected by it, the image scale of the partial color image corresponds to a predetermined, common image scale.

Arrangement for the projection of a multi- coloured image into a projection surface

In a device for generating a quadrangular illuminating field, having a light mixing rod, which has a quadrangular cross-section as well as a quadrangular inlet area and a quadrangular outlet area and guides light coupled in via the inlet area to the outlet area, in order to generate therein the quadrangular illuminating field, the outlet area is limited by four rectilinear sides, of which two each meet in one of the corners of the outlet area at an angle which is not equal to 90&deg;.

Device for generating a quadrangular illuminating field and use of such device in an optical device comprising a surface to be illuminated having a predetermined shape

In a device for generating a quadrangular illuminating field, having a light mixing rod, which has a quadrangular cross-section as well as a quadrangular inlet area and a quadrangular outlet area and guides light coupled in via the inlet area to the outlet area, in order to generate therein the quadrangular illuminating field, the outlet area is limited by four rectilinear sides, of which two each meet in one of the corners of the outlet area, and, in one or two corners, the sides meeting therein converge at right angles while, in the other corners, the sides meeting therein converge at an angle, which is not equal to 90&deg;.

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Jena, Germany

Gudrun Schroeter