Optical: systems and elements – Stereoscopic
Patent
1997-01-17
1998-09-22
Henry, Jon W.
Optical: systems and elements
Stereoscopic
359463, 359566, 359619, 359 20, G02B 518, G02B 2722, G02B 2744, G02B 532
Patent
active
058123130
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a method of providing a magnified image of a periodical image pattern on a preferably plane surface.
BACKGROUND ART
U.S. Pat. No. 4,878,735 discloses an optical imaging system comprising a first plate with equidistantly arranged diffraction elements in the form of lenses. After the first plate with equidistantly arranged diffraction element, a further plate also with equidistantly arranged diffraction elements is arranged. The plates are placed in parallel. By means of the first plate, a plurality of images of an object in an image pattern is formed. The centrally arranged images of the object are smaller than the peripherally arranged images of the same object. By means of the plurality of images, which at least partially correspond to a periodic image pattern, and the subsequent plate a magnified image of each of the images in the image pattern is generated. However, a perspective image of the object is not obtained by this image generation and two images are seen, if the almost periodic image pattern is viewed upon with two eyes through the second plate. Thus, the known system is unable to give a spatial impression with a depth effect.
SUMMARY OF THE INVENTION
The object of the invention is to show how to obtain a correct spatial image and, according to the invention, this object is obtained by an apertured sheet with diffraction or refraction elements, such as lenses or openings, being arranged in front of the image pattern and preferably at a distance therefrom, the apertured sheet preferably being in a plane and in a given direction to the plane having a center distance between the elements, which is different from, but almost corresponds to the center distance in the same direction on the plate containing the periodic image pattern, the apertured sheet being slightly turned relative to the image pattern.
The accurate periodicity provides the spatial effect of one image (a stereoscopic image) when the arrangement is viewed upon with two eyes. The advantage of the center distance of the periodical image pattern being slightly different from the center distance of the apertured sheet is that it is not necessary to stand indefinitely far away from the arrangement.
The invention further relates to a use of the method according to the invention for providing a magnified image of a periodic image pattern, which may be exposed. According to the invention, an apertured sheet with diffraction or refraction elements, such as lenses or openings, is arranged in front of the periodic image pattern and preferably in distance therefrom, the apertured sheet preferably being in a plane and in a given direction to the plane having a center distance between the elements, which is different from, but almost corresponds to the center distance in the same direction on the plate containing the periodic image pattern.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is described in greater detail in the following, with reference to the accompanying drawings, in which:
FIG. 1 illustrates an arrangement according to the invention for providing a magnified image of a two-dimensional periodic image pattern comprising a plane containing the image pattern and a plane containing a perforated apertured sheet,
FIG. 2 is an example of an apertured sheet on a large scale,
FIG. 3 is an example of an image pattern on a large scale,
FIG. 4 is a perspective view of the arrangement illustrated in FIG. 1,
FIGS. 5a, 5b, 5c illustrate the structures of the openings in the aperture plane,
FIG. 6 is an illustration of how the length b of each image element is calculated.
FIGS. 7 to 12 are illustrations of, how the distance d between the viewing point and the aperture plane influences .DELTA.h (the length b projected onto the aperture plane A), when the distance c between the aperture plane and the image plane is negative, and a is smaller than the length b, or when the distance c is positive and a is larger than the length b.
FIGS. 13 to 18 an illustration of the influence of the distance d on t
REFERENCES:
patent: 2401271 (1946-05-01), Suner
patent: 3597042 (1971-08-01), Favre
patent: 4158481 (1979-06-01), Hoyer
patent: 4621897 (1986-11-01), Bonnet
patent: 4878735 (1989-11-01), Vilums
patent: 4927238 (1990-05-01), Green et al.
patent: 5379133 (1995-01-01), Kirk
Boetius Henrik
Johansen Frithioff
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