JPS5810635A - Calibration of chemical color test paper reader - Google Patents

Abstract

PURPOSE:To make it possible to effect the calibration of a chemical color read sensing head by means of a reflected light, by providing a reflecting plate 7 on a guide plate, opposite to the sensing head. CONSTITUTION:A reflecting plate 7 is installed on a guide plate 5 on a test paper table 2 for carrying a chamical color test paper 1 to under a read sensing head 4. With the test paper 1 impregnated with a liquid to be inspected set on the test paper table 2, a read starting switch is depressed. In responce to this, a read sensing head 4 reads the light reflected by the reflecting plate 7 and grasps reference sinsitivity characteristics. The test paper table 2 is moved to locate either of small pieces of test paper 11, 12... directly under the sensing head 4 thereby to carry out reading of chemical colors.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for calibrating the output of a reading detection head of a color test paper reader prior to color reading by the color test paper reader. It is a device that detects the hue and degree of color development by a test liquid on paper. Color test paper is a device that detects the hue and degree of color development by a test liquid. Color test paper is a device that detects the hue and degree of color development by a test liquid. It is attached to a strip of composite material and is used to measure the components and concentration of the test liquid. The reading detection head is a place for reading the above-mentioned color development, and is composed of a light source lamp, a spectroscope for the wavelength of the color to be detected, such as a filter, a light receiving element, and an electric circuit for making them function. It is impossible to avoid damage, characteristics, and dirt on these components, resulting in a decrease in passage rate, drift, etc. Therefore, before performing reading detection, it is necessary to check whether there is any loss of function due to damage and to understand the reading sensitivity characteristics. It becomes necessary. That is, before the reading operation, the color reading detection head learns the reading sensitivity characteristics for the reference reflected light, and
Calibrate the reading of the test strip using this value as the reference value.

For this reason, conventional methods have been to add a standard reflective piece to the color test paper (Japanese Patent Publication No. 56-12814), or to place the color test paper on a table where it is fed under the color reading detection head using a Cera L-L. Attach a standard reflective piece to the
0-86595) and other measures were taken. The present invention is suitable for cases where it is not possible to attach such a standard reflective strip to the test paper table (for example, when there is no place for such attachment at the edge of the table).

In addition, in order to deal with the case where the color test paper does not have a standard reflective piece, a reflector plate for calibration is provided on the table guide directly facing the color read detection head. The test strip table should not be located above it during calibration. This will be explained with reference to a side view of the portion shown in FIG.

In the figure, 2 is a table on which color test paper 1 is set and carries it under the door for reading and detection, and 3 is a position detection head that detects a small piece of test paper 11.12°13 on color test paper 1. 5 is a guide stand for table 2; 6 is table 2;
This is the drive screw for. Reference numeral 7 denotes a reflector plate placed on the table guide stand 5 directly below the reading detection head 4. During calibration, that is, at the beginning, the table 2 is placed on the reading detection head 4.
It should be located so that it does not fit between the reflector 7 and the reflector 7. In the state shown in the figure, the colored test paper l immersed in the test liquid is set on the test paper table 2, and a switch (not shown) to start reading is pressed. The reading detection head 4 reads the light reflected by the reflection plate 70 and determines the reference sensitivity characteristics. Next, one of the target test paper pieces 11 and 12 is positioned directly under the reading detection head 4, color reading is performed, and apparent color characteristics are obtained. The genuine characteristic is obtained by combining both of these characteristics.

As described above, the present invention makes it possible to calibrate the reading detection head even when it is not possible to attach a standard reflective piece to the test paper table.

In the above explanation, the reflector is attached to the table guide stand, but the point is that the surface 7 on which the test paper table 2 moves,
A reflector plate 7 may be placed below the color reading detection head 2 (indicated by a phantom line in the figure), facing the color reading detection head 2.

[Brief explanation of the drawing]

FIG. 1 is a partial side view of a color test strip reading device used for carrying out the method of the invention. ■, Color test paper 2, Table 3, Position detection head 4, Reading detection head 5, Table guide stand 6, Table drive screw 7, Reflector plate 8, Table moving surface 11, 12.13 Test paper small piece Applicant: Mitsui Engineering & Shipbuilding Yanagimoto Seisakusho Co., Ltd. Agent Shigeo Kawada

Claims (1)

[Claims] A method for calibrating the output of the color reading detection head of a color test strip reading device, in which a reflector is placed opposite the color reading detection head under the moving test strip table of the device.