Patent
1983-01-19
1987-04-14
Corbin, John K.
G02B 308, G02B 504
Patent
active
046573550
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a device capable of simultaneously changing the width and direction principally of parallel light rays.
BACKGROUND ART
As means for changing the direction of light, there are reflecting mirrors. With a reflecting mirror, by the reflection at its surface of light, the direction changes, but, in the case of a planar reflecting mirror, the width of a light beam projected as incident light thereonto and the width of the reflected light beam are the same, and changing of width is not carried out. In a curved-surface reflecting mirror, although parallel light can be converted into convergent light or divergent light, a parallel light beam cannot be converted into a parallel light beam of different width. In order to convert a parallel light beam into a parallel light beam of different width, heretofore, there has been no way except to use a lens system, but a lens system is expensive, and, moreover, there is a limit in practical use to the width of the light beam which can be processed.
In view of the above facts, this invention has the object of obtaining a device for changing light width and direction which is capable of changing the direction of a light beam as it changes the width with any desired ratio, without any special restriction of the width of the light beam to be processed, and which can be produced by quantity production at a relatively low price.
DISCLOSURE OF THE INVENTION
According to this invention, the above stated object is achieved by a light width and direction changing device comprising a Fresnel plate having a surface constituted by providing in parallel arrangement countless minute ridges (each) having at least one sloped face.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of a Fresnel plate for use in the device for changing the width and direction of light of this invention;
FIG. 2 is a view showing one example of use of a light width and direction changing device having the Fresnel plate of FIG. 1 for the purpose of collecting energy of light;
FIGS. 3 and 4 are sectional views respectively showing different modified examples of the Fresnel plate of FIG. 1;
FIG. 5 through FIG. 7 are sectional views respectively showing different examples of the light width and direction changing device used for the purpose of collecting energy of light;
FIG. 8 is a sectional view showing a modified example of the Fresnel plate; FIG. 9 is a view showing one example of a light width and direction changing device in which is used another modified example of the Fresnel plate;
FIGS. 10 and 11 are sectional views respectively showing still other modified examples of the Fresnel plate;
FIG. 12 is a plan view of a Fresnel plate having ridges of curved shape;
FIG. 13 is a plan view of a Fresnel plate having ridges of circular shape;
FIG. 14 is a plan view of a Fresnel plate having ridges of orthogonal arrangement;
FIG. 15 is a plan view of a Fresnel plate having ridges intersecting to form angles of 45.degree.;
FIG. 16 is an explanatory view of a case wherein a Fresnel plate is used for conducting sunlight into a house;
FIG. 17 is an explanatory view indicating the relationships between a Fresnel plate, a house, and sunlight which has been conducted;
FIG. 18 is an enlarged vertical sectional view of a Fresnel plate;
FIG. 19 is an enlarged vertical sectional view of a Fresnel plate in a different mode of use;
FIG. 20 is an enlarged vertical sectional view showing one example of a composite structure of a Fresnel plate and a glass plate;
FIG. 21 is an enlarged vertical sectional view showing a composite structure of two Fresnel plates;
FIG. 22 through FIG. 24 are explanatory views respectively showing different examples of methods of conducting sunlight into houses;
FIG. 25 is a diagrammatic view illustrating indicating the state wherein an auxiliary prism for preventing color dispersion is provided on a main prism; and
FIG. 26 through FIG. 29 are sectional views explanatory of various means applied to Fresnel plates for preventing color disper
REFERENCES:
patent: 4185895 (1980-01-01), Stephans et al.
Corbin John K.
Gass Rebecca D.
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