JPS5960327A - Color measuring device - Google Patents

Abstract

PURPOSE:To increase the quantities of light of weak light sources which differ in light emission wavelength alternately in inverse proportion to the light emission quantities of the respective light sources, and to take a precise color measurement regardless of the ruggedness and luster of an object, by arranging elements over a measurement surface successively along a parallel circle and photodetecting reflected light. CONSTITUTION:Light emitting elements 1-3 of R, G, and B are arranged successively over the measurement surface 6 along the circle in a parallel plane, and the same point on the measurement surface 6 is irradiated. Light which is projected at 45 deg. and photodetected at 0 deg. is condensed by a lens 4 and photodetected by a photodetecting element 5. The number of elements are decreased because of brightness 2-10 tims as great as those of light emitting elements 1-3, and the number of elements 3 of B is decreased; they are arranged symmetrically. A microcomputer 7 sends lighting timing pulses for (n) times to an LED driver 8 to turn on the light emitting elements 1-3 of R, G, and B in time series. A reflection value by disturbing light when the elements are turned off and data when they are turned on are A/D-converted and inputted to the microcomputer 7 to obtain an addition mean for (n) times. The microcomputer 7 performs calculations based upon the both to obtain signal light, finding values of R, G, and B.

Description

[Detailed Description of the Invention] Is Mizumotori a weak light source like a light emitting diode? This paper relates to the color measuring device used.

A conventional color measuring device 11, as shown in FIG. Colored light emitting diode (hereinafter abbreviated as B-LED) (3) So as to illuminate the same part of the surface of the object to be measured,
Install mf, L, these R-L with a slight inclination &-J, respectively.
E Dil+, G-LEI) (2), B-L E
Dt31 gold time series gold time series point, measured object JXAI) -
The light is focused by the metal lens (4) with a diameter of t, and is received by the light receiving element (5).
”, Condition I specified in JIS Z 8722
K is as close as possible. However, with this thing, u1 at the current technological level &;l: B 7
LI! Book month: I) light, 1j1- is small to non-7:), for the increase of light knowledge R-, 1,]I; ]) ill,
It is necessary to make several molds such as G-11S D (2) and B-T-ED (3). For example, ] < −LE D ill,
G -L E I) +21,B -1,E I) +
When arranging about 20 pieces of 31 life, JIS Z 87
In order to satisfy the condition that all LEDs illuminate the same place at the object to be measured using a light projection method similar to Condition I in Section 22,
R-L ED(1), G-LED+21, B-LED(
There is no other way than to set 31 and the distance p of the object to be measured = li; Since the light emission and reception angles C) are 0° for light emission and 45° for light reception, there is a drawback that operation is easy due to the effects of gloss and surface irregularities of the object to be measured.

The misfire 1 is not designed for this purpose, and its purpose is to install a large number of light-emitting lights.
“The purpose is to increase the total amount of light and make it difficult for W4 to operate due to the effects of surface gloss and unevenness. It's in the middle of the day. According to the example of the length, 1 is set and 1 is turned into 1.

In Figure 2, (1) is R-L E Ii), (21
I''JG-LED, '+31fdB-LED, one in a circle in a plane of half five lines for the measurement 11116), several 71 in parallel in a rectilinear shape, and l at the same point on the measurement surface 16).
(Based on the % rule.The projected light angle Jf, S1 is as shown in Fig. 3, 4? light emitted, 0° received light, low angle, JIs Z
Condition IV of 8722 is not met: irL has a low light emitting and receiving angle. Then, the irradiated and reflected light is filtered through a lens (4
), and the light is received by the light receiving element (5). R-LE L
) +11, GL Jl; I) +21 is BL
EI) Since there are about 2 to 10 times more brightness I than +31, reduce the number of +3- L E D +31 pieces as much as possible and arrange them as shown in Figure 4 1'! do. Also, I< -L Jsu I) Ill, G-LED (2
), 13-L J No. D+31's light projection is distributed at points li'1' so that n-times 1-te 1-balance can be obtained.

Figure 5 is a block circuit diagram of the processing circuit that transmits data from Mikosi (7) to L E D l' liver (8) in Figure 6 (
a) ~(c)+7) J:, ') Vcl<-LLI
; Dill, G-L E D +21, B-L E
Send lighting timing pulse n times to each D(3), R-L E [+1, G-L E D +21, B
- LED131?1 lights up in chronological order. At that time, the data of the light off 11'I as shown in FIG. 6(d), that is, the value N of the reflected light due to the disturbance light and the lighting ++ as shown in FIG. 6(e)
:J data S+N and A/D converter (9)
,/D conversion, import it into 71, n
Perform the summative average of the number of times and subtract the noise, and then
Take out. In other words, the counter-pulsing light (noise light) due to external disturbance °C was added 11 times in total 37. When the averaged value (r-N) is added and averaged S+Nin times of lighting data, the signal light Id S=S +N-N is obtained, which is k?1' 1m (71T @mouth 1
', L "C(tl"j light intensity (Il) is taken out. In this way, the values of red, green, 1'1 color are determined. In addition, in Fig. 5, [01 + 1'!4: (deJ)ru.

As with steaming, the present invention uses weak light such as a light-emitting autograph to illuminate the measurement surface diagonally by placing several sheets in parallel along a circle within a 11' curve parallel to the light-emitting autograph. Since the color measurement was carried out by receiving all of the reflected light from 'J=tL', many optical diodes were arranged and the light could be increased by 111cm. Because we installed multiple light sources with the number flt1 type of light sources that emit black light such as red, green, and F'f three primary colors, the color Since the number of red, green, and light sources was made to be inversely proportional to Y, )1; emitted by each light source, each of the five colors of light Ja ( r j'
z, tt: The effect of being able to perform precise color measurements with L rotations? 1-41.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional color measuring device, Figure 2 is a perspective view of a conventional color measuring device.
J, l's ゛・: J℃IX+i example's oblique blessing 1, wealth 53 figure t
"Identical front view, FIG. 4 1 Identical 1- light III [i+,
Arrangement (44, 1, 5th shi IH same as above information processing time h'
ii logic circuit 1, 61st% 1(a)-(e)
ki (rq- is the second operating time point. (1) Red light, 91. tie A-to, (2) Red light emitting diode, (3) 113゛ color light emitting diode 1-
1 (5)... Light receiving element, (6) ゛IIt11Ki Sanzan;. Generation ■! (1 Patent Attorney I11 [1 Chief 73'N1
Diagram i: > 2 Vtsu 3 4th rt to 3rd

Claims (3)

[Claims] (1) A weak light source such as a light emitting diode is placed in parallel with several rice grains along a circle in a plane parallel to the measurement surface, and the measurement surface ff is irradiated diagonally and the reflected light and sound are received to measure the color. A color measuring device Vl with 4-1 features as described above. (2) A patent claim characterized in that a plurality of lights f! of the type (11) with emission wavelengths of red, green, blue 3 JfA colors, etc.) are arranged alternately in parallel. Range 1J
lIJi's own color measuring device 1'a. (3) The number of red, green, and blue light sources is inversely proportional to the light emission hi7 of each original image, and the total lF, k sign and -! 1f1) of the patent claim:
+:,i.