JPH0797446B2 - Method and apparatus for changing color of illumination light - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a color light changing method of illumination light, and more particularly, to a color light changing device capable of irradiating illumination light over all hues based on the principle of subtractive color mixing. .

(Prior Art) In a stage, a television studio, etc., in order to enhance the effect of performances, shows, dramas, etc. performed there, various colors of illumination light are changed to bring out various color scenes.

Conventionally, in order to change the color light of such illumination light,
For example, a color changer is used. This color changer is equipped with a device that allows multiple color filters to be inserted alternately on the front of the projection lens for irradiation light, which is mounted on the front surface of the housing that houses the light source. Or, similarly, a filter box that stores a long film in which various color filters are wound in a roll shape is installed, and the color light is changed by changing the filter by unwinding and rewinding the film.

(Problems to be Solved by the Invention) However, the number of colors that can be used is limited in such a method of changing the color of illumination light.

The use of three primary color light sources in a single device, and mixing and using these light sources, complicates the structure of the device.

The complexity of the device structure is increased by allowing the use of multiple color filters.

It takes time to attach and detach the filter or the filter box when exchanging.

There was an inconvenient problem such as.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and provide a method for changing the color light of illumination light that can easily and quickly reveal a wide variety of color scenes.

(Means for Solving Problems) The present inventor has paid attention to the following facts in the process of earnestly researching to achieve the above object.

That is, in the bundle of parallel rays obtained by collimating the light from the light source by the lens system, the light is not parallel and does not form an image.
Even if the filter is partially inserted in this bundle of rays, the color light of the light that is finally irradiated to the irradiation target is uniform as a whole,
And it means that they are averaged.

Therefore, when changing the color light of the illumination light, it is desirable to arrange a filter in this bundle of parallel rays, and in order to obtain various kinds of color light by combining the filters, a method using additive color mixture and subtractive color mixture is used. Therefore, the method of the present invention described below has been developed.

According to the method of changing color of illumination light of the present invention, a white light source is housed in a housing, and light from the light source is condensed by a lens system in which at least two lenses having a common optical axis are arranged apart from each other, and the lens is used. The light from the light source is made into a parallel light flux between the two, and the condensed light is colored by the filter arranged between the two lenses to change the color of the illuminated object in various ways. In the changing method,
Three filters of yellow (Y), magenta (M), and cyan (C), which are the three primary colors on the subtractive color mixture, are arranged outside the optical path of the parallel ray bundle between the lenses, and (a) ) Depending on the extent to which the filter Y is inserted into the outside of the optical path, the amount of light that has passed through the filter Y increases, and the amount of white light that does not pass through the filter Y decreases and the light that passes through the filter Y (B) a state in which the light is additively mixed with white light that does not pass through the filter Y, and (b) a state in which the filter Y is completely inserted in the optical path and white light is light that has passed through the filter Y, (c ) The filter Y is completely inserted into the optical path, and depending on the degree to which the filter M is inserted into the optical path, the overlapping portion of the filter M and the filter Y is transparent. Together is a subtractive color light increases,
(D) the state in which the transmitted light of the filter Y is reduced and the transmitted light of the filter Y and the subtractive mixed light transmitted through the overlapping portions of the filter M and the filter Y are additively mixed; And a state in which the filter Y is completely inserted in the optical path, and white light becomes a subtractive color-mixed light transmitted through the filter M and the filter Y, (e) the filter M and the filter Y are in the optical path After being fully inserted inside,
Depending on the extent to which the filter Y is pulled out of the optical path, more light passes through the filter M,
The amount of subtractive color light transmitted through the overlapping portions of the filter M and the filter Y decreases, and the transmitted light of the filter M and the subtractive color light passing through the overlapping portions of the filter M and the filter Y or additive color mixture (F) The filter Y is completely extracted out of the optical path, and white light becomes the filter M.
(G) the filter M is completely inserted in the optical path, the filter C is inserted in the optical path, and the subtractive mixed light passing through the filter C and the filter M is (H) a state in which the amount of light that passes through the filter M decreases and the amount of light that passes through the filter C and the filter M becomes a light that is additively mixed with the light that passes through the filter M A state in which the filter C and the filter M are completely inserted in the optical path, and white light becomes a subtractive color-mixed light that passes through the filter C and the filter M; (i) the filter C and the filter M are After being completely inserted into the optical path, the filter M is transmitted through the filter C according to the extent to which the filter M is pulled out of the optical path. As the amount of light emitted increases, the amount of subtractive-colored light that passes through the overlapping portions of the filters C and M decreases, and the transmitted light of the filter C and the overlapping portions of the filters C and M pass. A state in which the subtractive color mixture light is a color in which additive color mixture is performed, (j) a state in which the filter M is completely extracted outside the optical path, and white light is a light beam that passes through the filter C, (k) the filter M is Depending on the extent to which the filter Y is completely drawn out of the optical path and the filter Y is inserted into the optical path, the amount of subtractive color-mixed light that passes through the overlapping portions of the filter C and the filter Y increases and the filter The transmitted light of C decreases, and the transmitted light of the filter C and the overlapping portion of the filter C and the filter Y overlap. By arbitrarily selecting any one of the above conditions (a) to (k) in which the excess subtractive color mixture light becomes additive color mixture light, the color of the object to be projected and the shading of the color can be determined. It is characterized by being variously changed.

Further, the apparatus for changing color of illumination light according to the present invention includes a white light source housed in a housing, at least two lenses in which light from the light source is arranged so as to have an optical axis in common, and the two lenses are parallel to each other. In a color light changing device for illumination light, which comprises a color filter arranged outside the optical path of a bundle of rays, the color filter has three primary colors of yellow (Y), magenta (M) and cyan ( In addition to the three color filters of C), each of the three color filters includes drive means for moving the respective color filters in the optical path of the parallel ray bundle in a direction orthogonal to the optical axis, and (a) the filter Y.
Is increased in the optical path, the amount of light transmitted through the filter Y increases, and
The amount of white light that does not pass through the filter Y is reduced, and the light becomes an additive color mixture of the light that passes through the filter Y and the white light that does not pass through the filter Y. (b) The filter Y is completely inserted in the optical path. A state in which white light becomes light transmitted through the filter Y, (c) the filter M is completely inserted into the optical path, and the filter M is inserted into the optical path according to the extent to which the filter M is inserted. And the subtractive color mixture light transmitted through the overlapping portion of the filter Y increases, the transmitted light of the filter Y decreases, and the transmitted light of the filter Y and the overlapping portion of the filter M and the filter Y are transmitted. A state in which the light is a color that is additively mixed with the subtractive color mixture light, (d) the filter M and the filter Y are completely inserted in the optical path, and white State but as a light subtractive mixture passed through the filter M and the filter Y, (e)
After the filter M and the filter M are completely inserted into the optical path, more light is transmitted through the filter Y depending on the extent to which the filter Y is pulled out of the optical path. The subtracted color light that passes through the overlapping portion of the filter Y is reduced, and the transmitted light of the filter M and the subtractive color light that passes through the overlapping portions of the filter M and the filter Y become additive color light. State, (f) the filter Y is completely drawn out of the optical path, and white light becomes light that passes through the filter M, (g)
The filter M is completely inserted in the optical path, the filter C is inserted in the optical path,
And the amount of subtractive color light that passes through the filter M increases and the amount of light that passes through the filter M decreases, and the subtractive color light that passes through the filters C and M and the light that passes through the filter M (H) the filter C
And the filter M is completely inserted into the optical path, and white light is emitted from the filter C and the filter M.
(I) After the filter C and the filter M are completely inserted in the optical path, the filter C is extracted according to the degree of pulling the filter M out of the optical path. The amount of light that passes through the filter C and the filter M
A state in which the subtractive color mixed light transmitted through the overlapping portion of is reduced, and the transmitted light of the filter C and the subtractive color mixed light transmitted through the overlapping portions of the filter C and the filter M are light in which additive color mixing is performed, ( j) A state in which the filter M is completely drawn out of the optical path and white light becomes light that passes through the filter C, (k) The filter M is completely drawn out of the optical path, and the filter Y is Depending on the degree of insertion into the optical path, the subtractive color-mixed light that passes through the overlapping portions of the filter C and the filter Y increases, and the transmitted light of the filter C decreases and the transmitted light of the filter C decreases. And (a) to (a) to (3) above, in which the subtractive color mixture light transmitted through the overlapping portions of the filter C and the filter Y becomes the additive color mixture light. By selectively driving the drive device Izure or to one state of k), and characterized by changing the density of color and the color of the illuminated object to be projected in a variety.

(Example) Hereinafter, the method of the present invention will be described with reference to FIGS. 1 to 3.

As shown in FIG. 1, the light projected from the white light source 1 is reflected by the reflecting mirror 2, and two plano-convex lenses 3 and 4 having the same optical axis are arranged corresponding to the Ramsden type so that the reflected light is reflected. After passing through a lens system 5 for making the two lenses 3 and 4 parallel to each other, a projection lens 6 projects the light onto an irradiation target. Here, the above-mentioned members are housed in a housing (not shown) of the lamp.

Further, 7 is a shutter which serves as a diaphragm for adjusting the amount of projected illumination light, and 8 is a mask which is arranged on the converging point where the parallel ray bundle is converged by the plano-convex lens 4, and the projected light is scattered. It is a light-shielding plate for forming a spot (a polka dot pattern) or a focused light (circular).

The white light source 1 may be a xenon lamp, a halogen lamp or the like as long as it can project white light.
From the viewpoint of energy loss and usage conditions, it is desirable that the point light source is close to a point light source that emits less radiation in the infrared region outside the visible range, has less filament wear, and provides stable white light with a long life.

A filter for changing the color of the illumination light projected on the object to be illuminated is arranged outside the optical path in the parallel light flux between the lenses 3 and 4. Further, it is preferable to use a glass filter in consideration of the fact that the temperature inside the housing becomes high due to the heat emitted from the white light source 1, and three filters of yellow, magenta, and cyan which are the three primary colors on the subtractive color mixture are used. In the following, these filters are used in the order of yellow, magenta, and cyan in the order of Y filter 9 and M filter 10 respectively.
And C filter 11.

FIG. 2 shows a spectral distribution chart concerning the transmittance of each of these filters 9, 10, 11. In the figure, from the top, Y filter 9, M
The spectral distribution map of the filter 10 and the C filter 11 is shown. FIG. 3 is a diagram in which the coordinates of the illumination light obtained when these filters are used alone are plotted as Y, M, and C in the chromaticity diagram of the CIE color system, and W indicates the white point. .

Further, each of these filters 9, 10 and 11 is always inserted into the optical path from the same side across the optical path of the parallel ray bundle so as to be pulled out, and these operations are arranged at predetermined positions in the housing. For example, it is remotely controlled by a driving means such as a small motor. In addition, each filter has a shape slightly larger than the cross-sectional area of the parallel light flux.

Then, when the color light of the illumination light is changed by each of the filters 9, 10 and 11, the following is performed. For example,
When the Y filter 9 is placed in the optical path of the parallel light flux to illuminate the yellow illumination light, the M filter 10 is gradually inserted into the optical path, and the subtractive color mixture of yellow and magenta (strictly The area where the M filter 10 overlaps with the Y filter 9 becomes red due to the subtractive color mixture, and this red and yellow of the Y filter 9 only where the M filter 10 has not yet overlapped) cause the illumination from yellow to orange. When the color of the light gradually changes and the M filter 10 is completely inserted in the optical path, that is, when the two filters are stacked, the illumination light becomes the third light.
In the chromaticity diagram in the figure, the color has a chromaticity indicated by R and is red.

When the Y filter 9 is gradually pulled out from this state,
Illumination light gradually changes while passing through an intermediate color while adding a blue component, and becomes magenta when only the M filter 10 is used.
Furthermore, when the C filter is gradually inserted in this state, the illumination light gradually loses its reddish color, but only the bluish color remains,
When two sheets of M filter 10 and C filter 11 are overlapped, a blue color having a chromaticity indicated by a point B in FIG. 3 is obtained.

Then, when the M filter 10 is pulled out from this state, the illumination light changes while increasing the green tint, and the C filter 11
When it becomes only, it becomes cyan colored light. When the Y filter 9 is inserted into the optical path of the C filter 11 only, the illumination light gradually decreases in bluish color, and when the Y filter 9 and the C filter 11 are overlapped with each other, G is shown in FIG. When the filters 9, 10 and 11 are all pulled out from the optical path, white illumination light similar to the white light source 1 is obtained. On the other hand, even if the filters 9, 10 and 11 are partially inserted in the optical path, the illumination light is averaged and emitted as illumination light, so that the illumination light of color light with lower saturation compared to the case of all insertion Becomes Therefore, for example, considering the case where the Y filter 9 is inserted into or pulled out from the optical path, if the light of the white light source 1 matches the white point W in the angle shown in FIG. The change in light intensity can be taken as a movement on the straight line YW. This also applies to other filters, and also when two filters are stacked.

From the above, various colored lights of the illumination light obtained by the method of the present invention based on the principle of subtractive color mixture using the Y filter 9, M filter 10 and C filter 11 are
C and chromaticity of 6 points of R, G, B obtained by subtractive color mixing,
It is also possible to deal with the chromaticity on the hexagonal line formed by connecting these six points and the colored light of low chroma existing inside thereof.

The following table shows the relationship between the positions of the filters 9, 10 and 11 and the color light of the illumination light by the method described above. In the table, the bundle of parallel rays is represented by two parallel lines, and the Y filter 9, the M filter 10 and the C filter 11 are represented by Y, M and C, respectively.

(Effect of the Invention) The present invention collimates light from a light source by at least two lenses, and arranges three filters of yellow, magenta and cyan, which are the three primary colors of subtractive color mixing, outside the optical path of this parallel ray bundle. However, because these filters are used to change the color of the illumination light by inserting and pulling them out into the optical path, the color of the illumination light can be changed over a wide range in the visible range and can be used continuously, and the density can be adjusted arbitrarily. Can be changed to. Moreover, since such a method is adopted, it becomes possible to easily and promptly present a wide variety of color scenes, which are the needs of the stage, the television studio and the like. In addition, if the device is based on this method, it is possible to provide a compact device that does not complicate the structure.

[Brief description of drawings]

FIGS. 1 to 3 are for explaining the method of the present invention. FIG. 1 is an explanatory view showing an optical system of a color changer in which a filter is arranged, and FIG. 2 is a spectral distribution regarding transmittance of a filter used. FIG. 3 and FIG. 3 are chromaticity diagrams showing the illumination light obtained by the filter. 1 ... White light source, 3, 4 ... Plano-convex lens 5 ... Lens system, 9, 10, 11 ... Filter

Claims (1)

[Claims] 1. A white light source is housed in a housing, and light from the light source is condensed by a lens system in which at least two lenses having a common optical axis are arranged apart from each other. Is a parallel ray bundle, and the condensed light is colored by a filter arranged between the two lenses to change the color of the illumination target projected in various ways. Three filters of yellow (Y), magenta (M), and cyan (C), which are the three primary colors on the subtractive color mixture, are arranged outside the route of the parallel light flux between them, and (a) the filter Y is The amount of light that has passed through the filter Y increases according to the degree of insertion into the optical path, and the amount of white light that does not pass through the filter Y decreases, so that the light that has passed through the filter Y and the filter Y
(B) The filter Y is completely inserted into the optical path, and the white light is the light that has passed through the filter Y. (c) The filter According to the degree to which Y is completely inserted in the optical path and the filter Y is inserted in the optical path, the subtractive color light transmitted through the overlapping portion of the filter M and the filter Y is increased, and The transmitted light of the filter Y is reduced, and the transmitted light of the filter Y and the filter M and the filter Y are reduced.
(D) The filter M and the filter Y are completely inserted in the optical path, and the white light is the filter M and the filter Y. (E) After the filter M and the filter Y are completely inserted in the optical path, the filter M may be extracted into the optical path after the filter M and the filter Y are completely inserted in the optical path. As the amount of light transmitted through the filter M increases, the amount of subtractive color light that passes through the overlapping portions of the filter M and the filter Y decreases, and the transmitted light of the filter M and the overlapping portions of the filter M and the filter Y decrease. A state in which the transmitted light of the subtractive color mixture becomes a light of the additive color mixture, (f) The filter Y is completely pulled out of the optical path. (G) The filter M is completely inserted into the optical path, the filter C is inserted into the optical path, and the white light becomes the light that passes through the filter M. And the light transmitted through the filter M is decreased, and the light mixed with the subtractive color transmitted through the filter C and the filter M and the light transmitted through the filter M are additively mixed. (H) a state in which the light becomes a light, (h) a state in which the filter C and the filter M are completely inserted in the optical path, and white light becomes a light of a subtractive color mixture that passes through the filter C and the filter M; After the filter C and the filter M are completely inserted into the optical path, the filter M may be pulled out of the optical path. Accordingly, the amount of light transmitted through the filter C increases, and the amount of subtractive color light transmitted through the overlapping portions of the filter C and the filter M decreases, so that the transmitted light of the filter C and the filter C and the A state in which the subtractive mixed color light transmitted through the overlapping portion of the filter M becomes the additive color mixture light, (j) the filter M is completely drawn out of the optical path, and the white light becomes the light that passes through the filter C. State, (k) a subtractive color mixture in which the filter M and the filter Y are completely drawn out of the optical path and the filter Y is inserted into the optical path, and which passes through the overlapping portion of the filter C and the filter Y. As the amount of the emitted light increases, the light transmitted through the filter C decreases, and the light transmitted through the filter C and the filter C and The state in which the subtractive color light that has passed through the overlapping portion of the filter Y becomes the light in which the color mixture is additively mixed, and any one of the above states (a) to (k) is arbitrarily selected to project the illuminated object. A method for changing the color of illumination light, which comprises changing the color and the shade of the color in various ways. (2) A white light source housed in a housing, at least two lenses whose light axes are commonly spaced apart from the light from the light source, and a color arranged outside the optical path of the parallel light flux between the two lenses In a device for changing color of illumination light, the color filter comprises three color filters of yellow (Y), magenta (M) and cyan (C), which are three primary colors that transmit light in a subtractive color mixture. And includes driving means for moving each of the three color filters in the optical path of the parallel ray bundle in a direction orthogonal to the optical axis, (a) to the extent that the filter Y is inserted into the optical path. Accordingly, the amount of light that has passed through the filter Y increases and the amount of white light that does not pass through the filter Y decreases, so that the light that has passed through the filter Y and the filter Y
(B) The filter Y is completely inserted into the optical path, and the white light is the light that has passed through the filter Y. (c) The filter Depending on the degree to which Y is completely inserted in the optical path and the filter M is inserted in the optical path, the subtractive color mixture light passing through the overlapping portion of the filter M and the filter Y increases, and The transmitted light of the filter Y is reduced, and the transmitted light of the filter Y and the filter M and the filter Y are reduced.
(D) The filter M and the filter Y are completely inserted in the optical path, and the white color is the filter M and the filter Y. (E) The filter M and the filter Y are transmitted through the filter M depending on the degree to which the filter Y is completely inserted into the optical path and then the filter Y is pulled out of the optical path. As the amount of light emitted increases, the amount of subtractive mixed light that passes through the overlapping portions of the filter M and the filter Y decreases, and the transmitted light of the filter M and the overlapping portions of the filter M and the filter Y are reduced. A state in which the transmitted light of the subtractive color mixture becomes the light of the additive color mixture, (f) The filter Y is completely drawn out of the optical path. A state in which white light becomes light that passes through the filter M, (g) the filter M is completely inserted into the optical path, the filter C is inserted into the optical path, and the filter C and the filter M are The amount of light that is transmitted through the subtractive color mixture is increased and the amount of light that is transmitted through the filter M is reduced, and the light obtained by the additive color mixture of the light transmitted through the filter C and the filter M and the light transmitted through the filter M is added. (H) The filter C and the filter M are completely inserted into the optical path, and the white light becomes a subtractive color light that passes through the filter C and the filter M. (i) The filter C and the filter M are completely inserted into the optical path, and then the filter M is pulled out of the optical path. Accordingly, the amount of light that passes through the filter C increases, and the amount of subtractive color light that passes through the overlapping portions of the filter C and the filter M decreases, so that the transmitted light of the filter C and the filter C and the filter M decrease. A state in which the subtractive color light transmitted through the overlapping portion of M becomes a color in which additive color mixing is performed, (j) A state in which the filter M is completely drawn out of the optical path, and white light becomes a light that passes through the filter C. (K) Subtractive color mixing in which the filter M is completely pulled out of the optical path and the filter Y is inserted into the optical path, and the filter C and the filter Y pass through the overlapping portion. As the light increases, the light transmitted through the filter C decreases, and the light transmitted through the filter C and the filter C and the light A state in which the subtractive color light transmitted through the overlapping portion of the filter Y becomes a color in which additive color mixing is performed, and the projection is performed by selectively driving the drive device in any one of the above (a) to (k). A device for changing the color of illumination light, wherein the color of the illuminated object and the shading of the color are variously changed.