JPS6229053A - Illuminant device for white color standard - Google Patents

Abstract

PURPOSE:To obtain an illuminant device for white color standard with which desired chromaticity point can be obtained using no filter made of plastic or gelatin by using the fluorescent lamp adjusted to the specified chromaticity. CONSTITUTION:The luminescent light from the fluorescent lamp 1 constructed by coating and adhering the phosphor on the inside surface of a glass tube is emitted forward through the reflection plate 2 to reflect the light output from the light source forward, mesh filter 3 for adjusting the brightness, and the diffuse transmission plate 4. The reciprocal correlated color temperature of the enclosed fluorescent lamp is smaller than that of the luminous plate. It is desirable to use the lamp which is smaller by 15-35(MK<-1>) in the reciprocal correlated color temperature and of which chromaticity coordinate on the CIEuv chromaticity diagram is smaller by 0-0.01(uv) in the distance from the locus of the perfect radiator respectively.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a standard white light source, and more specifically to a standard white light source for maintaining and managing a reference white, which is the most important element for color reproduction, in a production factory of color televisions and the like. This invention relates to a standard white light source device that can be maintained stably for a long period of time.

[Technical background and problems of the invention]

The chromaticity point of the standard white color for color television is determined by the chromaticity point of the three primary colors (red, green, and blue) phosphors used, which is 3 on the chromaticity diagram.
It can be set arbitrarily within the rectangular range. For example, in the case of Japanese domestic products, the correlated color temperature is approximately 9000 to 12000,
Some foreign countries have about 6,500.

This variation in white chromaticity point causes the following problems in color reproduction of products. For example, set color temperature 10.0OO
When the color temperature of the product is as high as 12,0OOK compared to K, the overall image has a bluish tinge and at the same time a white Y.
His shirt looked pale and strange. On the contrary, 8,0OO
If the value is as low as K, the overall image will look amber and white Y-shirts will look old. As described above, the chromaticity point of the reference white color of color television has a great influence on the final received image, and therefore strict color management is required.

By the way, there are various methods for adjusting this reference white color, but most of them are based on visual matching with a standard white light source device whose chromaticity coordinates and luminance are set to the reference white color by spectrophotometry, or visual matching. We use a color checker that stores the chromaticity values of color television light-emitting surfaces that have been color-matched using color matching.
The basis of both is a standard white light source device.

The general configuration of these standard white light sources is, for example, when obtaining a light emitting surface with a correlated color temperature of io or ooox, a color temperature of 6
, 500 daylight color fluorescent lamps, reflectors, plastic or gelatin color temperature conversion filters, deviation conversion filters, and brightness adjustment neutral density filters inserted into filter frames and diffuser transmission plates. It has the following problems.

In other words, the spectral transmittance characteristics of plastic or gelatin filters used to adjust color temperature, deviation, and brightness change over time due to long-term use, resulting in color temperature decreasing and deviation increasing during use. There is a problem in that chromaticity changes occur due to this, and an improvement has been desired.

[Purpose of the invention]

The present invention aims to solve the above-mentioned problems and provide a standard white light source device that can stably maintain white light, which is most important for color reproduction in color television, for a long period of time.

[Summary of the invention]

The present inventors have studied a standard white light source device that can obtain a desired chromaticity point without using plastic or gelatin filters conventionally used for chromaticity adjustment, and have constructed it as follows. The aim was to develop the standard white light source device of the present invention.

That is, the standard white light source device of the present invention uses a fluorescent lamp made by coating the inner surface of a glass tube with a phosphor as a light source, a reflector plate for reflecting the light output from the light source to the front, and a luminance A fluorescent lamp incorporated in a device that emits light through an adjusting mesh filter and a diffuser transmission plate is characterized in that its reciprocal correlated color temperature is smaller than the reciprocal correlated color temperature of the light emitting surface, and more preferably 15 ~35 (
ME') is small and the chromaticity coordinate on the C I E uv chromaticity diagram is 0 to 0.01 in distance from the perfect radiator locus.
(uV) are each characterized by being small. Here, the optimum color temperature and deviation range of the fluorescent lamp used in the apparatus of the present invention are determined as follows. For example, the spectral reflection and transmission characteristics of a reflector, diffuse transmission plate, etc. that are considered to be used in a standard white light source device are measured, and the chromaticity of the light emitting surface is predicted by simulation from the spectral energy distribution that approximates the light source used. Nowadays, the spectral energy distribution of a light source can be easily and accurately simulated from the emission spectrum of the fluorescent material used, so by performing the above predictive calculations for various materials, the chromaticity point of the fluorescent lamp used can be determined by spectral reflection, Even if the transmission characteristics are slightly different, predictions can be made with high accuracy.

1% JL, small) - 1 booklet, 1 booklet, 1 piece, 1 piece of aluminum, a reflective plate (for example, an aluminum satin reflector), a diffuser-transmitting plate (for example, a decorative glass, all milky white glass).

The optimal range of the fluorescent lamp as described above was found by examining combinations of light-reducing filters (such as opal glass, etc.) and neutral density filters (such as nylon mesh filters, etc.).

Here, the range of color temperature and deviation is defined when the spectral reflectance and spectral transmittance characteristics of the reflector, mesh filter, and diffuse transmission plate are respectively defined in claim 2. Naturally, in the case of a material with characteristics that exceed this range, the color temperature and deviation will fall outside the numerical ranges mentioned above. However, from a color perspective, materials with such characteristics are not preferred as reflective or transparent materials when adjusting white color as in this device.

[Embodiments of the invention]

A block diagram of the apparatus of the present invention is shown in FIG. The light emitted from the fluorescent lamp 1, including the reflected light from the reflector 2, is radiated to the front through the filter frame 3 and the diffuse transmission plate 4. Figure 2 shows the spectral reflectance of the reflector used in the present invention. Similarly, FIG. 3 shows the spectral transmission of the mesh filter, and FIG. 4 shows an example of the spectral transmission of the diffuse transmission plate.

Furthermore, FIG. 5 shows a configuration diagram of a fluorescent lamp used in the apparatus of the present invention.

Example 1 5 in Figure 2. The first fluorescent lamp is used when obtaining a device with a color temperature of 6500 on the light emitting surface and a deviation of 0.003 uv using the reflector, mesh filter, and diffuser plate 8 in Figure 3 and 11 in Figure 4. Color temperature of a lamp produced using phosphors A and D shown in the table.

The deviations are shown in Table 2. Furthermore, the spectral energy distribution of the fluorescent lamp and the light emitting surface are shown in FIGS. 6 and 7.

Example 2 6 in Figure 2. When using the reflector plate 9 in Fig. 3 and 12 in Fig. 4, a mesh filter, and a diffuser plate to obtain a device with a color temperature of 9300 on the light emitting surface, a deviation o, and oosuv, the fluorescent lamp used is the first one. Color temperature of lamps produced using phosphors B and D shown in the table.

The deviations are also listed in Table 2. Further, the spectral energy distribution of the fluorescent lamp and the light emitting surface is also shown in conjunction with FIGS. 6 and 7.

Example 3 7 in Figure 2. Reflector plates 10 in FIG. 3 and 13 in FIG. 4,
When a fluorescent lamp used to obtain a device with a light emitting surface color temperature of 12000K, deviation o, and oosuv using a mesh filter and a diffuser plate is manufactured using phosphors C and D shown in Table 1. The color temperature and deviation of the lamps are also listed in Table 2. Further, the spectral energy distribution of the fluorescent lamp and the light emitting surface is also shown in conjunction with FIGS. 6 and 7.

Comparative Example When obtaining the chromaticity of the light emitting surface as in Example 3, a commercially available daylight fluorescent lamp (the phosphor used was phosphor E shown in Table 1).
) in 7. of Figure 2. In addition to the reflector, diffuser, and filter shown in 10 in Figure 3, there is a plastic neutral density filter (for example, ND-50 made by Tenryosha Co., Ltd.) shown in 14 in Figure 8.
Plastic color temperature conversion filters 15 and 16 in the figure (
For example, Tokyo Stage Lighting Club TB1. TB3) and a 17°18 plastic deviation conversion filter (for example, PU1 and PU4 manufactured by Tenryosha Co., Ltd.) shown in Fig. 8 are inserted.

The results are shown in Table 2 and FIGS. 6 and 7.

Note that each symbol in the figure corresponds to the light emitting surface chromaticity and lamp symbol in Table 2.

As is clear from the above embodiments, in contrast to the conventional method using a plastic filter, the apparatus of the present invention can achieve a predetermined luminous surface chromaticity by simply manufacturing fluorescent lamps of each chromaticity as shown in the embodiments. It can be seen that the following can be obtained. Furthermore, since it can be obtained without using plastic filters that inevitably suffer from photobleaching, as shown in Table 2, there is very little change over time, and the chromaticity shift has been improved to the extent that it does not become a problem even after 1000 hours of lighting. .

Incidentally, the phosphor used in the fluorescent lamp used in the device of the present invention may be a type of phosphor other than the examples or a mixture of a plurality of phosphors with different composition formulas, and in short, a phosphor within the above-mentioned chromaticity range. If there is one, the phosphor used is the first one: IE! γRight■1- Cow 1
[Effects of the Invention] As is clear from the above explanation, the device of the present invention can produce color by using a fluorescent lamp set to a predetermined chromaticity. The desired chromaticity of the light emitting surface can be obtained without using a plastic filter, which causes a chromaticity deviation. In addition, in the past, the transmittance of the plastic filter was set in stages, making it impossible to adjust the color temperature and deviation in stages, but with the device of the present invention, the chromaticity of the fluorescent lamp can be set arbitrarily. Because of this, it also has the effect of making the chromaticity settings linear.

Table 1 Table 2

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram for explaining the present invention in detail, Fig. 2 is a characteristic diagram showing the spectral reflectance of a reflector used in the device of the present invention, and Fig. 3 is a spectral transmission of the Metsy filter of the present invention. FIG. 4 is a characteristic diagram showing the spectral transmittance of the diffuser plate of the present invention, FIG. 5 is a schematic diagram of a fluorescent lamp, and FIGS. Figure 8 is a diagram showing the spectral energy distribution of a light lamp and light emitting surface; Figure 8 is a diagram showing the spectral transmittance of a conventional plastic filter; Figure 9 is a diagram showing the spectral transmittance of a conventional plastic filter.
The figure is a chromaticity diagram showing the light colors of the fluorescent lamp and the light emitting surface in the example. 19... Glass tube, 20... Fluorescent body, 21... Cap, 22... Cap pin, 23... Electrode, 1... Fluorescent lamp, 2... Reflector, 3 ...filter frame, 4
...Diffuse transmission plate. Agent Patent Attorney Nori Chika Ken Yudo Takehana Kikuo No. 1 Diagram ``Guka #print←9' Ichidashi Shichima No. 5 Diagram 4 Vote Q 梼zabee (Ukine 5) Guo Shichitoto ←More

Claims (2)

[Claims] (1) The light source is a fluorescent lamp made by coating the inner surface of a glass tube with a fluorescent material, and a reflector plate for reflecting the light output from the light source to the front and a mesh filter for adjusting the brightness of the light output. and a standard white light source device configured to emit light through a diffuser-transmitting plate, wherein the fluorescent lamp has a reciprocal correlated color temperature smaller than that of a light emitting surface. (2) The fluorescent lamp has a reciprocal correlated color temperature that is 15 to 35 (MK^-^1) smaller than the reciprocal correlated color temperature of the light emitting surface, and its chromaticity coordinates on the CIE_u_v chromaticity diagram are perfect radiators. The standard white light source device according to claim 1, characterized in that the distance from the trajectory is smaller by 0 to 0.01 (uv).