Optics: image projectors – Stereoscopic
Patent
1983-04-08
1985-11-26
Haroian, Harry N.
Optics: image projectors
Stereoscopic
G03B 2100
Patent
active
045551685
DESCRIPTION:
BRIEF SUMMARY
The invention is in the field of optical image formation and relates to a device for projecting stereoscopic, linear anamorphotically compressed pairs of images on to a double-curved, particularly spherical wide-screen surface, comprising a lighting unit acting on the image plane of a projector, a basic lens arranged in the beam following the image plane and associated with the projector and a supplementary lens cooperating with the lighting unit.
When showing films attempts have frequently been made to give the viewer the impression that he is taking part in the photographically represented events. The attractiveness of the realistic representation of a usually optically dramatic sequence, such as e.g. objects flying towards the viewer and precipitous journeys, which give rise to many different reactions on the part of the viewer, have led to numerous technical solutions in this field.
Thus, U.S. Pat. No. 4,129,365 describes a wide-angle projection arrangement, in which a picture formed from three images is projected on to a cylindrically curved projection surface in order to offer the viewer a panoramic effect. Through the use of a special type of flexible mirror, projection can take place without any disturbing view of the projection machines, which are positioned somewhat below and in front of the viewer. The necessary aspect ratio of the partial images is produced with the aid of anamorphotically acting, optical means. The apparatus expenditure, namely three cameras and in each case two, i.e. six reflecting mirrors in all is considerable. Special measures are also required for a jointless transition of the partial images.
Much less expenditure is required by the projection device described e.g. in U.S. Pat. No. 4,154,514, by means of which an image can be produced on a projection plane which has a pronounced arcuate curvature on one side and as a result the viewer is given the impression of a three-dimensional effect. Projection takes place over an angle between 138.degree. and 153.degree. on to a cylindrically curved plane. Compared with conventional three D-systems, under an angle usually smaller than 90.degree., no additional optical viewing aid is required for producing the three-dimensional effect. The projection arrangement described in this specification merely consists of a single projection apparatus with upstream-connected, anamorphotic aids, in order to produce the necessary enormous width/height ratio. 35 mm standard films with anamorphotic images are used for projection purposes.
The impression of the optical three-dimensional effect is largely based on the pronounced curvature of the projection plane, which surrounds the viewer of the photographic scene or occupies the field of view of the eye to the extent that the image frame is no longer perceived. Thus, it is not a picture in the manner that it is perceived by both eyes with the given interoccular spacing and is processed to a three-dimensional image in the brain.
Another technical solution is known in which two anamorphotically compressed images, correlated to one another with an interoccular spacing are imaged on a 70 mm standard film in a ratio of 1:2. On projection, this leads to a stereo wide-screen picture with two images correlated with the interoccular spacing and also having different polarizations. Viewing takes place by means of a viewing aid, namely spectacles or glasses with two polarizers sloping towards one another.
For taking the pictures, two basic optics are connected upstream of in each case one anomorphotic lens, whose optical axes essentially have the average spacing of a pair of human eyes. Since on the film, the centre-to-centre distance of the photograph is determined by its size and is generally considerably smaller, the imaged object distances are adapted in known manner by reflecting mirrors. As a function of the conventional anamorphotic lens/basic optics combination, this requires relatively large overall length and consequently a limitation of the camera angle. The convergence control of the two correlat
REFERENCES:
patent: 2307981 (1943-01-01), Babcock et al.
patent: 2810323 (1957-10-01), Coleman
patent: 3425775 (1969-02-01), Jacobsen
Jacobsen Jan
Meier Walter
Haroian Harry N.
Walter Meier
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