JPH04248204A - Variable color lighting apparatus - Google Patents

Abstract

PURPOSE:To provide lighting of any required color tone with an apparatus of simple structure. CONSTITUTION:Light beams are made to pass in succession through a plural number of light transmission portions 52-56 of a color mixing filter 10 placed in front of a light source 40. The various colored transmitted light beams from the light transmission portions 52-56 are made to be recognized by human eyes as if they is a mixed light by the afterimage phenomenon when the passing times through the light transmission portions 52-56 are controlled with the drive means 20 of the filter 10 and a control means 30 to provide a mixed light of any required color tone.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to a variable color lighting device, and more specifically, it is used as a stage spotlight, indoor mood lighting, etc., and is capable of producing different colors of illumination light with a single lighting device. This invention relates to a color lighting device.

0002

[Prior Art] Conventionally, there is a variable color illumination device in which a color film is placed in front of a light source, and the light transmission characteristics of this color film allow illumination light of different colors to be irradiated. . In this case, to change the color of the illumination light, prepare a number of color films with different transmitted colors, and replace the color films as necessary.
The desired illumination light is obtained. Furthermore, by using a plurality of color filters with different transmitted colors in a stacked manner, it is possible to obtain illumination light with a mixture of colors that cannot be obtained with a single color film.

Another structure of the variable color illumination device is to provide illumination light of the three primary colors of red, blue, and green by simultaneously illuminating with three types of light sources and adjusting the output of each light source.
There is also a device that can provide illumination light of any color tone by mixing light of three primary colors. Furthermore, as an illumination device used in the colorimeter, three primary color filters each equipped with a shutter are lined up, and with the shutter opening amount of each filter adjusted, the light from the light source is transmitted through each filter, and the transmitted light is There is a device that optically mixes the three primary colors to obtain mixed light, which is called a Guild colorimeter.

0004

[Problems to be Solved by the Invention] However, among the conventional variable color illumination devices described above, devices that replace color films cannot obtain only monochromatic illumination light with one color film; The color film must be replaced every time, which is extremely time-consuming. In order to obtain complex colors that cannot be obtained with a single sheet of color film, it is necessary to layer multiple sheets of color film.
Combining color films is difficult and it is not possible to easily obtain any color. Another disadvantage is that when color films are overlapped, the amount of light decreases and the intensity of illumination decreases.

Furthermore, devices that use three primary color light sources require three times the light source and a power supply mechanism for the light source as compared to monochromatic lighting, and also require a dimming device for each light source. The disadvantage is that the structure becomes very large-scale, the equipment becomes larger, the power consumption increases, and the cost increases. Furthermore, the device that adjusts the color of the three primary colors of illumination light with a shutter uses a shutter to block part of the illumination light of each color.
It has the disadvantage that the lighting efficiency is poor and the intensity of the lighting changes depending on the color of the mixed color lighting.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a variable color illumination device that can easily provide mixed color illumination of any desired color, and that can be equipped with simple and compact equipment.

[0007]

[Means for Solving the Problems] A variable color illumination device according to the present invention which solves the above problems includes a color mixing filter disposed in front of a light source, and a plurality of light transmitting portions having different transmitted colors in the color mixing filter. a driving means for driving the color mixing filter so that each light transmitting part of the color mixing filter passes in front of the light source in sequence at an interval shorter than the afterimage time of the human eye; It is equipped with a control means for controlling the driving means so that the passing time can be changed for each transmission section.

[0008] The light source consists of a lamp, a reflector, power supply wiring, etc. similar to a normal light source for illumination. The illumination light from the light source does not need to be colored, and can be ordinary white light. The color mixing filter is arranged in front of the light source and on a plane through which illumination light passes. The color mixing filter is provided with a plurality of light transmitting parts that transmit different colors. The transmitted color refers to the color of illumination light that comes out of the light transmitting section when the light transmitting section is illuminated with light from a light source. The material of the light transmitting part is glass or transparent synthetic resin surface.
They are made of the same materials as conventional monochromatic color filters, such as ultra-thin filter layers made of metals or metal compounds formed by vapor deposition or other means, or translucent colored synthetic resin films. be. A color mixing filter is constructed by arranging a plurality of monochromatic light transmitting parts made of such materials. It is preferable to have three types of light transmitting parts corresponding to the three primary colors of red, blue, and green light because all the colors can be easily adjusted. Two or more types of light transmitting parts having arbitrary transmitting colors may be arranged in accordance with the color required for the illumination light.

[0009] The plurality of color light transmitting parts may be arranged by dividing a disc-shaped color mixing filter in the circumferential direction, or by using a ring-shaped color mixing filter formed by connecting and fixing both ends of a band-shaped film. Light transmitting portions of a plurality of colors may be arranged at regular intervals in the length direction. In addition, the arrangement of the light transmitting portions can be freely changed in accordance with the mechanisms of the drive means and control means, which will be described later.

[0010] The driving means may include a driving mechanism such as a servo motor, and can operate the color mixing filter so that the plurality of light transmitting parts sequentially pass in front of the light source. Specifically, for example, the disc-shaped color mixing filter may be rotated so that the light transmitting portion passes through the irradiation area of the light source set on the circumference. Further, while the annular color mixing filter is running endlessly, illumination light may be emitted from a light source disposed inside the annular color mixing filter toward the outside of the color mixing filter.

[0011] The faster the moving speed of the color mixing filter by the driving means, the more natural mixed color illumination can be obtained; It is sufficient that the time required for one cycle is shorter than the afterimage time of the human eye. Specifically, the rotation speed of the disc-shaped color mixing filter is preferably set to about 1800 rpm or more. Further, in the annular color mixing filter, when one annular color mixing filter is provided with n sets of three primary color light transmitting parts, it is preferable to set the rotation speed to about (1800/n) rpm or more.

[0012] As the drive mechanism of the drive means, it is preferable to use a mechanism such as a servo motor whose rotational speed or operating speed can be precisely controlled. The control means is composed of an electronic circuit or the like, and is capable of freely and finely controlling the operating speed such as the rotational speed of the drive means by adjusting the voltage and power frequency supplied to the power source of the drive means. Specifically, controllers used in various conventional automatic control devices are used.

The driving means is controlled by the control means by adjusting the time during which one light transmission section passes in front of the light source for each light transmission section of a plurality of colors. The proportion of time each light transmitting part passes in front of the light source determines the proportion of the light component of each color in the mixed illumination light. Therefore, in order to obtain the desired mixed color light, the mixed color light is decomposed into transmitted light components from each light transmitting section, the ratio of each transmitted light component is calculated, and the operation of the driving means is controlled based on the ratio. do it.

The variable color lighting device according to the present invention can be applied to stage spotlights, indoor mood lighting, illumination of architectural structures, and any other applications that require various mixed color lighting. .

[0015]

[Function] Light transmitting parts of multiple colors pass in front of the light source, and the passing time of one cycle in which one set of light transmitting parts passes is
If the afterimage time is shorter than the afterimage time of the human eye, the human eye perceives the transmitted light as mixed color light in which transmitted light of multiple colors is harmoniously integrated. The color tone of this mixed color light is determined by the proportion of time each transmitted light from the plurality of light transmitting parts passes in front of the light source. That is, the longer the transmitted light from the light transmitting section passes in front of the light source, the larger the proportion of the color components of the mixed color light will be. If one set of light transmitting parts corresponds to the three primary colors of blue, red, and green light, mixed color light having an arbitrary color tone can be obtained. Even if a plurality of light transmitting parts other than the three primary colors are combined, mixed color light in which the respective light components are mixed in an appropriate ratio can be obtained.

Therefore, the color mixing filter having a plurality of light transmitting parts is operated by the driving means so as to pass sequentially in front of the light source, and the operation of the driving means is controlled by the control means, so that each of the light transmitting parts If the time that the light passes in front of the light source can be freely adjusted, a single illumination device can provide illumination light of multiple colors with different tones.

[0017]

Embodiments Next, embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall structure of a variable color lighting device. The light source 40 consists of a lamp similar to a normal lighting device, and is provided with a reflecting plate 42 so as to radiate light forward in a concentrated manner. A color mixing filter 10 is arranged in front of the light source 40.

[0018] The color mixing filter 10 has a roughly disc shape,
The whole is divided into three by dividing lines extending radially from the center.
Light transmitting portions 52, 54, and 56 each having a fan shape are provided. The light transmitting parts 52 to 56 are made of the same material as a normal illumination color filter, and include a red light transmitting part 52 that emits red R transmitted light, a blue light transmitting part 54 that emits blue B transmitted light, and a green light transmitting part 52 that emits transmitted light of blue B. It is composed of three types of green light transmitting sections 56 that emit green transmitted light. Illumination light 46 from the light source 40 passes through any light transmitting part (the light transmitting part 54 in the illustrated position) in a certain area 44 on the circumference of the color mixing filter 10 and is irradiated to the front of the color mixing filter 10. be done.

A gear portion 14 having an uneven shape is provided on the outer periphery of the color mixing filter 10. The gear portion 14 includes a pinion gear 22 connected to a servo motor 20 serving as a driving means.
are engaged. Therefore, when the servo motor 20 is rotated, the color mixing filter 10 rotates, and the plurality of light transmitting parts 52 to 56 of the color mixing filter 10 sequentially pass across the irradiation area 44 of the light source.

A controller 30 serving as a control means is connected to the servo motor 20, and the rotational speed of the servo motor 20 is controlled based on electrical commands from the controller 30. Although not shown, the controller 30 is connected to an arithmetic processing device such as a computer, an input/output device, etc. in order to calculate and input control procedures and speed adjustment ratios to obtain desired mixed color illumination. be able to. It also analyzes the output light from the variable color illumination device to determine whether the desired color mixture is obtained, and accurately adjusts the control of the driving means based on the analysis results of the output light. You can also add devices.

FIG. 2 shows the color mixing effect of illumination light in the variable color illumination device having the above structure. The time period during which the color mixing filter 10 rotates once and each of the light transmitting parts 52 to 56 passes through the irradiation area 44 of the light source is defined as one cycle. If the rotational speeds at which the respective light transmission parts 52 to 56 pass through the irradiation area 44 are Vg, Vr, and Vb, each of the light transmission parts 52 to 56 passes through the irradiation area 44 for a time that is inversely proportional to the rotation speed. Therefore, each light transmitting section 52
Transmitted light of a color corresponding to 56 is irradiated according to the ratio of the passing time. In this way, the light sequentially switched to a plurality of transmitted colors is irradiated in front of the color mixing filter 10. For example, in the case of the figure, green light G has the shortest irradiation time, blue light B has the next shortest irradiation time, and red light R has the shortest irradiation time.
The irradiation time is the longest. As a result of the transmitted light of each color being irradiated in sequence at extremely short intervals, the human eye perceives the transmitted light of each color as mixed color light that is harmoniously integrated at the proportion of each irradiation time. A desired mixed color illumination can be obtained.

If it is desired to change the color of the mixed color illumination, it is sufficient to change the ratio of the rotational speeds Vg . If the ratio of this rotational speed Vg... is changed at once from one ratio to another, the color tone of the mixed color lighting will change instantaneously, and the change from one ratio to another will be repeated many times. If done gradually over a cycle, the color tone of the mixed-color illumination can also be changed so that it transitions smoothly and naturally from one tone to another.

Next, FIGS. 3 and 4 show a variable color illumination device having a structure different from that of the above embodiment. As shown in FIG. 4, an annular color mixing filter 60 is used as the color mixing filter 60, which is formed by connecting both ends of a band-shaped film made of synthetic resin such as PET in an annular shape. The annular color mixing filter 60 includes, along the longitudinal direction, a red light transmitting section 52 that emits transmitted light of red R, a blue light transmitting section 54 that emits transmitted light of blue B, and a green transmitting section that emits transmitted light of green G. A large number of sections 56 are arranged alternately. Driving feed holes 58 are provided at regular intervals on both side edges of the annular color mixing filter 60.

As shown in FIG. 3, an annular color mixing filter 60
is supported in a frame shape with its feed hole 58 meshed with the feed gear 26 and drive gear 24 at a plurality of locations. A servo motor 20 similar to that described above is connected to the drive gear 24,
A controller 30 is connected to the servo motor 20. A light source 40 and a reflecting plate 42 are arranged in the inner space of the annular color mixing filter 60. The light emitted from the light source 40 passes through the annular color mixing filter 60 and is emitted forward.

In the variable color illumination device having the above structure, the plurality of light transmitting parts 52 to 56 sequentially move across the front of the light source 40, as described above, so that each of the light transmitting parts 52 to 5
Mixed color illumination is obtained in which the transmitted light from 6 is mixed. A plurality of sets of three primary color light transmitting sections 5 are provided in one annular color mixing filter 60.
2 to 56 are arranged, one cycle of color mixing effect is performed when one set of three primary color light transmitting parts 52 to 56 passes through. That is, if n sets of three primary color light transmitting parts 52 to 56 are arranged in one annular color mixing filter 60,
One rotation of the disc-shaped color mixing filter 10 corresponds to 1/n rotation of the annular color mixing filter 60. Therefore, in this embodiment, the rotation speed of the annular color mixing filter 60 as a whole may be smaller. Further, this embodiment has the advantage that the color mixing filter 60 has a low bulk, and the entire device can be made compact. However, the disk-shaped filter 10 has the advantage of being excellent in mechanical strength and durability, and having a simple driving mechanism.

[0026]

Effects of the Invention According to the variable color illumination device according to the present invention as described above, in front of the light source, light transmitting portions of a plurality of colors of a color mixing filter operated by a driving means are sequentially passed through. Since the control means can freely control the time during which each light transmitting section passes in front of the light source, it is easy to perform mixed color illumination in which the transmitted light of multiple colors passing through each light transmitting section is mixed in any ratio. can be obtained.

[0027] Since the passage time of each light transmitting section can be continuously changed at an arbitrary ratio, an extremely delicate result cannot be obtained in a conventional device even if a large number of color filters are prepared. Differences in color tone can also be easily realized. Further, there is no need to replace color filters of multiple colors one by one, and it is possible to change the color tone of mixed color illumination instantaneously or continuously, which is impossible with the method of replacing color filters.

Next, since a single normal white light source is required as a light source, the structure of the light source is simpler and more compact than the conventional device using three primary color light sources, and there is no need to replace the light source when it wears out. The effort required for maintenance and management is also reduced. In particular, in order to precisely adjust the output of the three primary color light sources, a complicated and special light control device is required. Since it is only necessary to provide a drive means and a control means, the equipment cost is also reduced.

Next, even if the light transmitting part passes in front of the light source, it will not block the illumination light, so a shutter can be used to
Compared to the conventional method of controlling the amount of light of the primary colors, the efficiency of illumination usage is much better, and it is possible to obtain strong and bright mixed-color illumination.

[Brief explanation of the drawing]

[Fig. 1] A perspective view showing an embodiment of a variable color illumination device according to the present invention.

[Figure 2] Explanatory graph diagram explaining color mixing effect

[Figure 3]
Side view showing another embodiment

[Figure 4] Perspective view showing annular color mixing filter

[Explanation of symbols]

10　Disk-shaped color mixing filter 20 Servo motor (drive means) 30 Controller (control means) 40 Light source 52-56 Light transmission part 60 Annular color mixing filter

Claims (1)

[Claims] Claim 1: A color mixing filter is disposed in front of the light source, the color mixing filter is provided with a plurality of light transmitting parts having different transmitted colors, and each light transmitting part of the color mixing filter has a time shorter than the afterimage time of the human eye. A driving means for driving the color mixing filter so as to pass in front of the light source sequentially at intervals, and a control means for controlling the driving means so that the time during which each light transmitting section passes in front of the light source can be changed for each transmitting section. A variable color lighting device comprising: