JPS61130844A - Artificial light source evaluator - Google Patents

Abstract

PURPOSE:To achieve a quick and easy evaluation of an artificial light source for D65 light, by receiving light transmitted through five pairs of transmitting object having the same chromaticity under a reference light d65 through three filters with a specified spectrochemical transmission characteristic. CONSTITUTION:Light radiated from a lamp 1 is transmitted through a transmitting object 3 comprising five pairs of matters becoming insochroic under a reference light D65 and a matter with the transmissivity almost uniform in the visible wavelength range and made incident into a photo detector 4. The photo detector 4 comprises three filters having respectively spectochemical transmission characteristics of isochroic functions -x10(lambda), -y%d10(lambda) and -z10(lambda) established in 1964 by Commission Internationale de Enluminure. Then, light passing through the photo detector 4 converted to an electrical signal with a photoelectric converter 5 corresponding to three stimulus values Xo, Yo and Z0 of the lamp 1 itself and five pairs of three stimulus values Xi, Yi and Zi (i=1-10) of the transmitting objects 3 to be stored into a memory circuit 6. The output of the circuit 6 is converted to the chromaticity with an arithmetic unit 7 and compared with the value of the chromaticity set for a comparator 9 to show 10 whether the chromaticity fo the lamp 1 is within an allowable range of the chromaticity fo the reference light D65 or not.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to the general lighting field, mainly the indoor lighting field, where the lamp to be measured is in the visible range (wavelength 3802 to 800 m).
This invention relates to an evaluation device for an artificial light source that performs all evaluations to determine whether or not it conforms to the standard element D65 in the range (nm).

Conventional technology Currently, the typical daylight and standard illumination light is CI.
Color temperature 65 established by E (International Commission on Illumination) in 1966
00 standard original DeelJ” is used.

Standard light D85 is a standard that represents daylight, and is therefore often used to display the color of objects and evaluate how colors appear.

This standard light D65 only has a specified spectral distribution, and it is extremely difficult to create an artificial light source that completely matches the spectral distribution of the standard original D65. Artificial light sources with are commonly used. For this reason, it is important to evaluate how well a certain artificial light source matches the standard original D65 in terms of characteristics.
Evaluation method published by CI・E in 1983 (CIE P
ub No.51 ”A method for asse
ssing the quality of dayli
ght simulators for colori
This is carried out through computational analysis based on the method of ``Metry,'' (1983)).

However, this evaluation method involves measuring the spectral distribution of an artificial light source to be measured, using the spectral distribution data obtained as a result of the measurement, and performing a large number of calculation steps.

Problems to be Solved by the Invention In such conventional techniques, in order to evaluate whether or not the artificial light source to be measured conforms to the standard element D65, it is necessary to measure the spectral distribution of the artificial light source, This required a complex and extremely time-consuming process of calculation from measured data.

The present invention solves these problems, and provides an artificial light source evaluation device that can quickly quantitatively evaluate whether or not an artificial light source conforms to the standard D6f with a simple configuration. It is something to do.

Means for Solving the Problems In order to solve the above problems, the present invention uses the CIE1964 color matching function i. (λ), Te,. (λ), ;,. (λ) and the standard light D66f) also have six pairs of transmitting objects having the same chromaticity, a photoelectric converter that converts the light output from the transmitting objects into an electrical signal, and a photoelectric converter. The present invention is characterized in that it includes a comparator and a comparator that computes the electrical signal.

Effects The present invention has the above-described configuration, and the evaluation of the artificial light source for D6-, which could not conventionally be obtained by simple measurement, can be performed quickly and easily, and the effect is great.

Embodiment FIG. 1 is a block diagram of an embodiment of the artificial light source evaluation apparatus of the present invention. In Figure 1, 1 is the lamp to be measured, 2 is the lens, and 3 is 5 pairs (1
0 types) of transparent objects and one type of transparent object with uniform spectral transmittance in the visible wavelength range, 4 is a light receiver, 6 is a photoelectric converter,
6 is a memory circuit, 7.8 is an arithmetic unit, 9 is a comparator, 1o
is a display unit.The operation of the artificial light source evaluation apparatus of this embodiment configured as described above will be described below.

The source emitted from lamp 1 passes through the lens and passes through the transparent object 3.
incident on the As shown in Figure 3, the spectral transmittance characteristics of the transmitting object 3 are 6 pairs (total 10 types) of objects that are the same color under standard light D66, and have almost transmittance in the visible wavelength range. There are a total of 11 types of uniform objects, and the sizes of these 11 types of objects are fan-shaped and uniform. Furthermore, each of these transparent objects is designed to rotate around its original axis.

The light transmitted through the transparent object 3 enters the light receiver 4.

The light receiver 4 has a CIE1ee four color function i, as shown in FIG. (λ), i,. (λ), and 11° (λ), each having spectral transmission characteristics. 3
The parts other than the two filter parts (the shaded parts of the light receiver 4 in FIG. 1) are made of objects that do not transmit light.

The source that passed through the light receiver 4 was an electrical converter 6, which received electrical signals corresponding to the tristimulus values (Xo, Yo, Zo) of the lamp to be measured 1 itself, and 6 pairs (10 types) of the transparent object 3. +7
) Electrical signals corresponding to the tristimulus values (X, eY, , z, , i=1 to 1o) are obtained. The output signals corresponding to the respective tristimulus values obtained by the photoelectric converter 6 are stored in the memory circuit 6.

Output signal of memory circuit 6 (tristimulus value of lamp 1 itself)
The signals corresponding to xo, yo, zo) are converted into chromaticity by a computing unit 7. The chromaticity of the lamp 10 obtained by the calculator 7 is compared with the chromaticity value set by the comparator 9, and it is determined whether the chromaticity of the lamp 1 is within the allowable range of the standard original D65 chromaticity. It is displayed on the display section 1o.

Further, the output signal corresponding to the tristimulus values of 6 pairs (10 types) of the transparent object from the memory circuit 6 is processed by the arithmetic unit 8 to calculate the color difference for each of the 6 pairs and the color difference (L*
, a*b* color, difference) is calculated. The average value of the six pairs of color differences is displayed on the display unit 10. If the value displayed on the display unit 10 is 0.25 or less, the evaluation rank is A.
B rank in the range of 0.26 to 0.6, C rank in the range of 0.5 to 1.0, C rank in the range of 1.0 to 2.0, 2
．． A 6-level evaluation is made where 0 or more is E rank. Here, for evaluation ranks up to aAa and aBm, the lamp to be measured 1 is evaluated as having practically the same color reproduction characteristics in the visible wavelength range as compared to the standard original D65.

Effects of the Invention As is clear from the above examples, the present invention can be used in the field of lighting, mainly indoor lighting, by a simple method.
In particular, it is possible to evaluate how well a lamp to be measured used for color inspection or color measurement matches the standard D66 in the visible range (wavelength 380 nm to 780 nm), and its effectiveness. is big.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an artificial light source evaluation device according to an embodiment of the present invention, and Fig. 2 is a CIE1984 color matching function 11o (λ).
,te,. (λ), il. (λ) characteristic diagram, FIG. 3 is a spectral transmittance characteristic diagram of five pairs of transparent objects that are the same color under standard original D65 light. 1... Lamp to be measured, 2... Lens, 3... Transparent object, 4... Light receiver, 5... Photoelectric Converter, 6... Memory circuit, 7, 8... Arithmetic unit, 9... Comparator, 10... Display section. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure age length (nrn) Figure 3

Claims (1)

[Claims] CIE1964 color matching function @x@_1_0(λ), @y@
A receiver with the characteristics of _1_0 (λ) and @z@_1_0 (λ), 5 pairs of transparent objects having the same chromaticity under standard light D_6_5, and an electrical signal of the light output from the transparent objects. 1. An artificial light source evaluation device comprising: a photoelectric converter that converts the photoelectric signal into an electric signal; an arithmetic unit that calculates the photoelectrically converted electric signal; and a comparator.