JPH02269939A - Biochemical measuring instrument - Google Patents

Abstract

PURPOSE:To obtain the measuring instrument which does not require a color chart and is inexpensive and easy to use by setting a concn. with a concn. setter in such a manner that an isochromatic light emitting device emits light with the same color as the color of color identification test paper. CONSTITUTION:A liquid crystal display device 3, an isochromatic light emitting surface 4a, concn. setting buttons 6, 7 which make the setting operation of the concn. setter 8 or the like are disposed on the front surface 2a of a case 2. A CPU 9 stores the pulse widths Wr, Wg, Wb of the driving pulses of respective LED chips Cr, Cg, Cb of a three-color light emitting LED 4 corresponding to the densities in the ROM built therein and drives the LED 4 via an LED driver 11. The concn. set with the setter 8 is displayed on a display device 3 and the light of the same color as the color of the color identification test paper 12 corresponding to this concn. is emitted from the light emitting surface 4a. An operator, therefore, brings the test paper 12 generated with a color reaction by the sample near to the light emitting surface 4a and operates the light emitting surface 4a until the surface has the same color as the color of the coloring part 12a of the color identification test paper. Then, the concn. displayed on the display device 3 is the concn. of the sample.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a biochemical measurement device that measures sample concentration using a color test paper.

(B) Conventional technology Color test paper is used to measure the concentration of a substance to be detected in a sample, such as blood sugar level or urine sugar level. To read the density from the degree of coloration of the coloration test paper, as shown in FIG. 6, the color chart 13 and the colored portion 12a of the coloration test paper are visually compared. Alternatively, it is also possible to optically measure and read the colored portion. FIG. 7 shows an example of optical measurement, in which light from the light emitting element 14 is irradiated onto the colored part 12a,
The light receiving element 15 receives the reflected light from the coloring part 12a, and the density is determined from the light reception signal of the light receiving element 15.

(c) Problems to be Solved by the Invention - In the density measurement method using a color chart described in F, a color chart is always required for measurement, and if there is no color chart, measurement cannot be performed. There are some problems. In addition, in the case of the above-mentioned optical needle Nll+, not only a light emitting element and a light receiving element but also a light emitting element driving circuit, a light receiving signal processing circuit, a holder for shielding external light, etc. are required, which increases the price of the device and increases the cost of the device. However, there was a problem in that operations such as setting the colored test paper in the holder were complicated.

The present invention was made in view of the above, and aims to provide an inexpensive and easy-to-use chemical measuring device that does not require a color chart.

(d) Means and operation for solving the problems In order to solve the above problems, the biochemical measuring device of the present invention includes a color-equivalent light emitting device that is visually compared with a color test paper, and a concentration setting that sets the concentration. means, a driving means for driving the isochromatic light emitting device to emit light in a color corresponding to the density set by the density setting means, and a display means for displaying the density set by the above-mentioned intensity setting means. It is what it is. When setting all+, the density is set by the density setting means so that the isochromatic light emitter emits light in the same color as the color test paper, and the density at that time is read from the display means. Concentration settings can be easily performed using buttons, etc., and the operation is simple as the color test paper and the color-equivalent light emitting device are visually compared, and the device configuration can be simplified, resulting in lower costs. .

(E) Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 shows an external perspective view of an example biochemical measuring device 1. FIG. On the top surface 2a of the case 2, there is a liquid crystal display CLCD.
:Display means) 3, a color-matching light emitting surface 4a, a power button 5, and a density setting button 6.7 are provided. The color-matching light emitting surface 4a is a three-color light emitting surface LI shown in FIGS. 2(a) and 2(b). , D (isochromatic light emitter) 4 emits light.

This three-color light emitting LED includes a red light emitting L F, a D chip Cr, a blue light emitting LED chip Cb, a green light emitting 1-1P, and a D chip 10g, and is equipped with a light diffusing agent 4b. It is integrally covered, and 4C is a lead.

FIG. 3 is a block diagram for explaining the circuit configuration of the chemical measuring device 1 according to the embodiment η. Reference numeral 8 denotes a density setting device 8, to which density setting switches 6a and 7a, respectively operated by the density setting buttons 6 and 7, are connected. The concentration set by the concentration setting device 8 is taken into the CP [) 9. Note that the power switch 5a operated by the +i;7 power button 5 and the liquid crystal display 3 are also connected to the CPU 9.

CP (J9 has a built-in (or external) ROM that stores the pulse widths W r , W g , W b of the drive pulses for each of the D chips Cr, C (z, Cb) for each density. , the CPU 9 obtains the pulse width for the set density from the ROM and outputs it to the pulseless width modifier (PWM) 10.

The pulse width modulator 10 generates drive pulses Pr, Pg, and Pb having pulse widths Wr, Wg, and wb based on a pulse width signal from the CPU 9 (see FIG. 4). Based on these drive pulses Pr, Pg, pb, the LED driver 11 actually controls the 17'P, D chips Cr, Cg, Cb.
To force the horse. That is, L E D chips Cr, C
(<, Cb is controlled by the pulse width Wr, Wg, Wb, and each L E D chip Cr, Cg
, Cb are said to be sufficiently fast compared to the visibility against flickering. Further, as shown in FIG. 5, the driving may be performed by modulating pulses with a higher frequency. In addition, ■7mi D driver 11 itself is CP
It is controlled by the gate signal g of U9.

In this embodiment of the biochemical measuring device 1, when the concentration setting button 6 is pressed, the concentration set by the concentration setting device 8 increases, and when the concentration setting button 7 is pressed, the concentration decreases. The concentration thus set is displayed on the liquid crystal display 3, and light of the same color as the seven-color test paper corresponding to this concentration is emitted from the isochromatic light emitting surface 4a.

When performing measurements, press the power button 5 to turn on the power, and also remove the 7-color test paper 1 that has caused a color reaction depending on the sample.
2 near the isochromatic light emitting surface 4a (see Fig. 1),
While visually comparing the two, operate the density setting button 6.7 so that the color-matching light emitting surface 4a becomes the same color as the coloring portion 12a of the coloring test paper. When the colors become the same, the concentration displayed on the display 3 becomes the concentration of the sample.

In the above embodiment, a 7-segment type LCD 8 is used to display the density digitally, but '6?
In place of the concentration, a judgment value of 11, 10, etc. may be used, and the design can be changed as appropriate.

(f) Detailed Description of the Invention As described in detail, the biochemical measuring device of the present invention includes a color-equivalent light emitting device that is visually compared with a color test paper, a concentration setting means for setting a concentration, and a concentration setting means for setting a concentration. The device is easy to operate because it includes a driving means for driving the isochromatic light emitting device to emit light in a color corresponding to the density set by the color setting means, and a display means for displaying the density set by the density setting means. Furthermore, since the configuration is simple, the cost of the device can be reduced. Furthermore, it has the advantage that measurement can be performed even when a color chart is not available.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a biochemistry measuring device according to an embodiment of the present invention, and FIGS. 2(a) and 2(b) are three-color luminescent lights used in the biochemical measuring device R, E D
3 is a block diagram illustrating the circuit configuration of the biochemistry measuring device, and FIG. 4 is a diagram illustrating the three-color light emission and drive pulse of the biochemistry measuring device. 5 is a diagram explaining another example of this drive pulse, FIG. 6 is a diagram explaining density reading using a conventional color chart, and FIG. 7 is a diagram explaining density reading using conventional optical measurement. It is a figure explaining reading of. 3: Liquid crystal display, 4: Three-color LED, 6.
7: Density setting button, 8: Density setting device, 9: CPU,
11: LED driver, 12: Color test paper. Patent Applicant Tateishi Electric Co., Ltd. Agent Patent Attorney Shigeru Nakamura Figure 1 Figure 2 (a) Figure 2 (b) Figure 3 Figure 4 Pb m LI Ll Figure 5 pb - First layer U No. Figure 6 Figure 7

Claims (1)

[Claims] (1) A color-matching light emitter that is visually compared with a color test paper, a density setting means for setting the density, and driving the color-matching light emitter to emit light in a color corresponding to the density set by the density setting means. 1. A biochemical measuring device comprising: a driving means for displaying the concentration set by the concentration setting means; and a display means for displaying the concentration set by the concentration setting means.