JPH0378570B2 - - Google Patents
Info
- Publication number
- JPH0378570B2 JPH0378570B2 JP57171936A JP17193682A JPH0378570B2 JP H0378570 B2 JPH0378570 B2 JP H0378570B2 JP 57171936 A JP57171936 A JP 57171936A JP 17193682 A JP17193682 A JP 17193682A JP H0378570 B2 JPH0378570 B2 JP H0378570B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- emitting diode
- lights
- turned
- color
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims 3
- 230000000996 additive effect Effects 0.000 claims 3
- 238000006243 chemical reaction Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/46—Measurement of colour; Colour measuring devices, e.g. colorimeters
- G01J3/50—Measurement of colour; Colour measuring devices, e.g. colorimeters using electric radiation detectors
- G01J3/501—Colorimeters using spectrally-selective light sources, e.g. LEDs
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Spectrometry And Color Measurement (AREA)
Description
【発明の詳細な説明】
本発明は、色測定装置、更に詳しくは、赤色発
光ダイオード、緑色発光ダイオード、青色発光ダ
イオード等をそれぞれ複数回ずつパルス点灯して
反射光を受光し、被測定物の色測定を行なう色測
定装置の光源点灯方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a color measurement device, more specifically, a red light-emitting diode, a green light-emitting diode, a blue light-emitting diode, etc., each of which is pulse-lit multiple times to receive the reflected light, thereby detecting an object to be measured. The present invention relates to a method for lighting a light source of a color measuring device that performs color measurement.
一般に、色測定装置は第１図のように、赤色発
光ダイオード（以下Ｒ−LEDと略す）１，緑色
発光ダイオード（以下Ｇ−LEDと略す）２およ
び青色発光ダイオード（以下Ｂ−LEDと略す）
３を被測定物表面で同一部分を照射するようにそ
れぞれ少し傾けて設置し、これらＲ−LED１，
Ｇ−LED２，Ｂ−LED３を時系列的に点灯し、
被測定物で反射した光をレンズ４で集光して受光
素子５で受光する。この場合、Ｒ−LED１，Ｇ
−LED２，Ｂ−LED３の他に太陽光、外部照明
等の外乱光を受光素子５が受光する。上述の色測
定装置の信号処理回路は、従来、第２図のよう
に、マイクロコンピユータ６よりLEDドライバ
ー７へ第３図ａのイ，ロ，ハのようにＲ−LED
１，Ｇ−LED２，Ｂ−LED３にそれぞれ複数回
（ｎ回）ずつ点灯タイミングパルスを送つて、Ｒ
−LED１，Ｇ−LED２，Ｂ−LED３を時系列的
にパルス点灯し、点灯時に反射光と外乱光とを受
光素子５で受光して増巾器８で増巾した後、第３
図ｂのようなＡ／Ｄ変換タイミングパルスでＡ／
Ｄコンバータ９によりＡ／Ｄ変換し、消灯時に外
乱光のみを受光して第３図ｃのようなＡ／Ｄ変換
タイミングパルスでＡ／Ｄ変換してそれぞれのｎ
回の加算平均を求め、点灯時の加算平均と消灯時
の加算平均との差をマイクロコンピユータ６によ
り計算し、出力回路１０に反射光信号を出力して
いた。即ち、Rs，Bs，Bsをそれぞれ赤、緑、青
の反射光信号、Rs.N，Gs.N，Bs.Nをそれぞれ
赤、緑、青の反射光と外乱光との受光信号、
RN，GN，BNをそれぞれ赤、緑、青の外乱光信
号とすると、
Rs＝１／ｎ（
〓n
Rs.N−
〓n
RN）
Gs＝１／ｎ（
〓n
Rs.N−
〓n
GN）
Bs＝１／ｎ（
〓n
Rs.N−
〓n
RN）
として求めることができる。しかるにこのものに
あつては、第３図ａ〜ｃから明らかなように反射
光と外乱光との受光信号も外乱光信号も発光ダイ
オードの点灯時又は消灯時のある瞬時の値しかと
り込まないため、検出精度を上げるためにｎを大
きくすると、測定値を出すまでに時間がかかると
いう欠点を有していた。 Generally, a color measuring device includes a red light emitting diode (hereinafter abbreviated as R-LED) 1, a green light emitting diode (hereinafter abbreviated as G-LED) 2, and a blue light emitting diode (hereinafter abbreviated as B-LED) as shown in Figure 1.
3 are installed at a slight angle so that they illuminate the same area on the surface of the object to be measured, and these R-LEDs 1,
Turn on G-LED2 and B-LED3 in chronological order,
The light reflected by the object to be measured is focused by a lens 4 and received by a light receiving element 5. In this case, R-LED1, G
- In addition to the LED 2 and the B-LED 3, the light receiving element 5 receives disturbance light such as sunlight and external lighting. Conventionally, the signal processing circuit of the above-mentioned color measuring device has been used to transmit R-LEDs from a microcomputer 6 to an LED driver 7 as shown in A, B, and C in Fig. 3A, as shown in Fig. 2.
1. Send lighting timing pulses to G-LED2 and B-LED3 multiple times (n times) each, and
-LED1, G-LED2, and B-LED3 are pulse-lit in time series, and when they are turned on, the reflected light and disturbance light are received by the light-receiving element 5 and amplified by the amplifier 8, and then the third
A/D conversion timing pulse as shown in figure b
The D converter 9 performs A/D conversion, receives only the disturbance light when the light is off, and performs A/D conversion using the A/D conversion timing pulse as shown in Fig. 3c.
The microcomputer 6 calculates the difference between the average when the light is on and the average when the light is off, and outputs a reflected light signal to the output circuit 10. That is, Rs, Bs, and Bs are red, green, and blue reflected light signals, respectively, Rs.N, Gs.N, and Bs.N are light receiving signals of red, green, and blue reflected light, and disturbance light, respectively.
If RN, GN, and BN are red, green, and blue disturbance light signals, respectively, Rs=1/n ( 〓 n Rs.N− 〓 n RN) Gs=1/n ( 〓 n Rs.N− 〓 n GN ) Bs=1/n( 〓 n Rs.N− 〓 n RN). However, in this case, as is clear from FIGS. 3a to 3c, both the light reception signal of the reflected light and the disturbance light, and the disturbance light signal only capture instantaneous values when the light emitting diode is turned on or off. Therefore, if n is increased in order to improve detection accuracy, it has the disadvantage that it takes time to obtain a measured value.
本発明はかかる点に鑑みてなされたもので、そ
の目的とするところは、精度よく反射光信号を得
る上、処理速度を向上することにある。以下本発
明を詳細に説明する。 The present invention has been made in view of these points, and its purpose is to obtain reflected light signals with high accuracy and to improve processing speed. The present invention will be explained in detail below.
本発明の色測定装置および信号処理回路の構成
は、第１図および第２図と同じであり、Ｒ−
LED１，Ｇ−LED２，Ｂ−LED３を点灯する場
合に、第４図ａイのようにＲ−LED１とＧ−
LED２を同時にn0回点灯し、ついで第４図ａロ
のようにＧ−LED２，Ｂ−LED３を同時にn0回
点灯し、更に、第４図ａハのようにＢ−LED３，
Ｒ−LED１を同時にn0回点灯するように２個の
LEDを順次組合せて同時点灯し、従来例と同様
の処理を行なう。尚、第４図ｂは点灯時のＡ／Ｄ
変換タイミングパルス、第４図ｃは消灯時のＡ／
Ｄ変換タイミングパルスである。したがつて、反
射光信号Rs，Gs，Bsは、
Rs＋Gs＝１／n0〔
〓n0
（RS.N＋GS.N）−
〓n0
（RN＋GN）〕
Rs＋Bs＝１／n0〔
〓n0
（GS.N＋BS.N）−
〓n0
（GN＋BN）〕
Bs＋Rs＝１／n0〔
〓n0
（BS.N＋RS.N）−
〓n0
（BN＋RN）〕
より、Rs＋Gs，Gs＋Bs，Bs＋Rsの信号を得て、
これらから、Rs，Gs，Bsを求めることができ
る。これを従来例と比較すると、単独に、Ｒ−
LED１，Ｇ−LED２，Ｂ−LED３等に着目すれ
ば、点灯回数は従来例はｎ回に対して本発明では
2N0回となり、ｎ＝n0とすれば２倍の回数、つま
り２倍の光エネルギーを受光することになる。し
たがつて、従来例と同程度の精度を得るために
は、n0＝１／２ｎとして1/2の点灯回数、即ち1/2の
処理速度にすることができる。尚、前述の３元連
立方程式を解く時間はＲ−LED１，Ｇ−LED２，
Ｂ−LED３の点灯間隔に比べて無視できる程短
かい。又、Ｒ−LED１，Ｇ−LED２，Ｂ−LED
３の２個の組合せは前述の実施例以外でもよい。 The configurations of the color measuring device and signal processing circuit of the present invention are the same as those shown in FIGS.
When lighting LED1, G-LED2, and B-LED3, R-LED1 and G-LED1 and G-LED3 are turned on as shown in Figure 4a.
LED 2 is lit n 0 times at the same time, then G-LED 2 and B-LED 3 are lit n 0 times at the same time as shown in Fig. 4 a-b, and then B-LED 3 and B-LED 3 are lit simultaneously as shown in Fig. 4 a-c.
2 lights so that R-LED1 lights up n 0 times at the same time.
The LEDs are combined in sequence and turned on at the same time, and the same processing as in the conventional example is performed. In addition, Fig. 4b shows the A/D at the time of lighting.
Conversion timing pulse, Fig. 4c shows A/ when the light is off.
This is a D conversion timing pulse. Therefore, the reflected light signals Rs, Gs, and Bs are Rs+Gs=1/n 0 [ 〓 n0 (RS.N+GS.N) − 〓 n0 (RN+GN)] Rs+Bs=1/n 0 [ 〓 n0 (GS.N+BS .N) − 〓 n0 (GN+BN)〕 Bs+Rs=1/n 0 [ 〓 n0 (BS.N+RS.N) − 〓 n0 (BN+RN)] Obtain the signals of Rs+Gs, Gs+Bs, Bs+Rs,
From these, Rs, Gs, and Bs can be determined. Comparing this with the conventional example, it is found that R-
Focusing on LED1, G-LED2, B-LED3, etc., the number of lighting times in the present invention is n times in the conventional example.
2N 0 times, and if n=n 0 , then twice as many times, that is, twice as much light energy will be received. Therefore, in order to obtain accuracy comparable to that of the conventional example, n 0 =1/2n can be set to 1/2 the number of times of lighting, that is, 1/2 the processing speed. In addition, the time to solve the above three-dimensional simultaneous equations is R-LED1, G-LED2,
It is so short that it can be ignored compared to the lighting interval of B-LED3. Also, R-LED1, G-LED2, B-LED
The combination of the two of 3 may be other than the above-mentioned embodiment.
叙上のように本発明は、３色の発光ダイオード
のうち２個を順次組合せて同時に点灯する如くし
たから、精度よく反射光信号を得ることができる
上、処理速度を向上できるという効果を奏するも
のである。 As described above, since two of the three color light emitting diodes are sequentially combined and lit at the same time, the reflected light signal can be obtained with high accuracy and the processing speed can be improved. It is something.
第１図は一般の色測定装置の斜視図、第２図は
同上の信号処理回路のブロツク回路図、第３図ａ
〜ｃは従来の光源点灯方法の動作タイムチヤー
ト、第４図ａ〜ｃは本発明の動作タイムチヤート
である。
１……赤色発光ダイオード、２……緑色発光ダ
イオード、３……青色発光ダイオード、５……受
光素子。
Figure 1 is a perspective view of a general color measuring device, Figure 2 is a block circuit diagram of the same signal processing circuit, and Figure 3a.
4 to 4 c are operation time charts of the conventional light source lighting method, and FIGS. 4 a to 4 c are operation time charts of the present invention. 1... Red light emitting diode, 2... Green light emitting diode, 3... Blue light emitting diode, 5... Light receiving element.
Claims (1)
よび青色発光ダイオードをそれぞれ同回数ずつパ
ルス点灯し、点灯時に反射光と外乱光とを受光
し、消灯時に外乱光のみを受光して点灯時と消灯
時との受光量の加算平均をそれぞれ求め、点灯時
の加算平均と消灯時の加算平均との差により反射
光信号を得る如くした色測定装置の光源点灯方法
において、３色の発光ダイオードのうち２個を順
次組合せて同時に点灯する如くしたことを特徴と
する色測定装置の光源点灯方法。1 The red light-emitting diode, the green light-emitting diode, and the blue light-emitting diode are each pulse-lit the same number of times, and when the lights are on, they receive reflected light and ambient light, and when the lights are off, they receive only the ambient light, and the light is received when the lights are on and when the lights are off. In the light source lighting method of a color measuring device, two of the three color light emitting diodes are sequentially calculated in such a way that a reflected light signal is obtained by calculating the additive average of each color, and then obtaining a reflected light signal from the difference between the additive average when the light is turned on and the additive average when the light is turned off. A method for lighting a light source for a color measuring device, characterized in that a combination of light sources are turned on at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57171936A JPS5960325A (en) | 1982-09-30 | 1982-09-30 | Light source lighting method of color measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57171936A JPS5960325A (en) | 1982-09-30 | 1982-09-30 | Light source lighting method of color measuring device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5960325A JPS5960325A (en) | 1984-04-06 |
| JPH0378570B2 true JPH0378570B2 (en) | 1991-12-16 |
Family
ID=15932568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57171936A Granted JPS5960325A (en) | 1982-09-30 | 1982-09-30 | Light source lighting method of color measuring device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5960325A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3735176A1 (en) * | 1987-10-17 | 1989-04-27 | Draegerwerk Ag | DOSIMETER |
-
1982
- 1982-09-30 JP JP57171936A patent/JPS5960325A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5960325A (en) | 1984-04-06 |
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