Patent
1985-08-13
1988-04-26
Corbin, John K.
350318, 350315, G02B 523, G02B 526
Patent
active
047400595
DESCRIPTION:
BRIEF SUMMARY
I. TECHNICAL FIELD
The invention relates to a method and an apparatus for color synthesis by optical mixing of colors and varying the relative intensity of at least one of the colors for the purpose of producing a plurality of hues over the spectrum.
The expression, "optical mixing[, used herein, refers to nonphysical color mixing in which transparent filters are disposed in beams from light sources and the colored light beams are made to interact with one another by superimposition. Several filters can be arranged one behind the other in one and the same beam (known as "subtractive color mixing"), or else the light rays passing through individual filters are projected onto an at least partially common surface (known as "additive color mixing"). Details on this kind of color science are contained in physics textbooks, and therefore there is no need to discuss it further at this point. "Optical mixing" includes combined mixing methods, i.e., subtractive and additive color mixing can be done successively on sections of the beam, but this will be discussed further below.
II. STATE OF THE ART
In the science of color up to the present, three primary colors have always been used and brought selectively into interaction with one another. The primary colors, blue, yellow and red, are regularly used (cf. Gerritsen's book, "Farbe", 1975 Otto Maier Verlag, Ravensburg). The technical application of the three-color theory, however, is complex and always requires three separate systems to control the local distribution of the color components including their relative intensity (saturation). This applies to optical systems (color television for example) as well as to printing processes, the color black being generally added in printing processes in order to counteract the so-called graying effect.
Attempts have also been made to use two beams or two different filters of which only one is a color filter to influence the color characteristic of projected images, both arranged in the one beam. By means of the second beam, a colored field is then projected--a so-called "antidiapositive" whereby the subjective perception of color is altered (German Federal OS No. 16 22 975). Aside from the fact that processes in the human eye and brain play a fundamental role, important parts of the color spectrum fail to be reproduced by such a method or by an apparatus corresponding thereto.
III. PROBLEM TO WHICH THE INVENTION IS ADDRESSED
The invention is therefore addressed to the problem, in the above-described method of color synthesis, of considerably reducing its complexity, while nevertheless producing a plurality of hues distributed over the spectral range. At the same time, subjective influences such as surrounding field and simultaneously projected contrasting or complementary colors are to be avoided.
IV. EXPOSITION OF THE INVENTION
The solution of the stated problem is accomplished in accordance with the invention, in the process described above, by using exclusively two colors. One of these colors, "red-violet", has, in the spectral range between about 300 and 580 nm, an intensity or transmission maximum between 370 and 460 nm, and a minimum between 540 and 580 nm, and beginning from this minimum the transmission curve first rises steeply, up to about 620 nm, to a value of the order of magnitude of the maximum, and from there it continuously rises less steeply into the infrared range above about 780 nm. The other color, "green", has, in the spectral range between about 300 and 660 nm, a transmission maximum between 520 and 560 nm and a minimum between 640 and 670 nm, and, beginning from this minimum the transmission curve rises substantially continuously to a transmission value which, at 750 to 770 nm, lies approximately in the range of the maximum.
By these data, which find their support in the diagrams in FIGS. 1 and 2, dyes of very specific spectral characteristics are defined, which, in dissolved form or in the form of ultrafine pigments which cause no appreciable light diffusion, are applied in a transparent bind
REFERENCES:
patent: 1953958 (1934-04-01), Gilmore
patent: 2673923 (1954-03-01), Williams
patent: 3089386 (1963-05-01), Hunt
patent: 3260152 (1966-07-01), Aston
patent: 4008482 (1977-02-01), Lang
Scientific American Band 200, May 1959, Experiments in Color Vision, pp. 84-99, by Edwin H. Land.
Principles of Color Television, Hazeltine Laboratories Staff, John Wiley & Sons, 1956, pp. 22-27.
Ben Loha
Corbin John K.
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