JPH086287Y2 - Optical property measuring device - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> In the present invention, a backing plate (or a standard plate, usually a rotating disk, etc., which is composed of two colors, and is hereinafter referred to as a "rotating disk") is an object to be measured. Arranged in parallel to the back side of the sheet and intermittently irradiating the light from the light source with a predetermined incident angle on the surface of the DUT (sheet-like paper (which will be explained in the following example using this paper)) Then, the reflected light detected at this time is dispersed by the spectral detection means consisting of an optical system, the spectral spectrum is guided to the sensor, and predetermined processing is performed based on the detection signal when the image is formed on the sensor, and the color of the paper The present invention relates to an optical characteristic measuring device for online measuring optical characteristics such as opacity and whiteness.

<Prior Art> Conventionally, as a technology of this type, a pair of upper and lower sensor units, which are generally provided on a frame for supporting a sensor and travel left and right on the frame, sandwich a sheet of paper and There is an on-line method for measuring the physical / optical characteristics of (see, for example, Japanese Utility Model Publication No. 63-141447 and Japanese Utility Model Publication No. 1-84048).

Specifically, regarding a pair of upper and lower sensor units, an upper detection unit having a detection means for irradiating the surface of the paper with light at a predetermined incident angle and detecting reflected light of the irradiated light, and the paper A backing plate consisting of two colors, white and black, on the surface parallel to the back surface of the irradiation position (hereinafter referred to as "rotating disk").
That is, the lower detection unit is arranged so as to face one of the colors. Then, an interface is provided at one end of the frame, and wiring for signal transmission / reception is provided in the frame, and then signals (for example, synchronization signals, etc.) are exchanged between the upper and lower units. In the measurement at the upper detection part, the rotating disc is rotated and the reflected light detected when the paper is backed by the black part of the rotating disc and the reflected light detected when it is backed by the white part of the rotating disc The optical characteristics of the paper can be measured from the relationship with the reflected light.

With such a device, measures against dirt on the rotating disk that affects measurement (especially when thin paper is used) (for example, remove paper dust falling on this rotating disk) , Exclusion), (b) The surface of the rotating disk is covered with a transparent protective film, and (b) the spiral direction is formed and the center coincides with the center of the rotating disk, and the rotation direction and the direction of the rotation circle are away from the center of the spiral. A brush whose cleaning direction matches the plate rotation direction is brought into contact with the rotating disk at a position outside the measuring optical path, or a brush that is in contact with the rotating disk surface at a position outside the measuring optical path to change the rotating disk radius. On the other hand, there is known a technique characterized in that a cleaning brush provided at a predetermined angle is provided (see, for example, Japanese Utility Model Laid-Open Nos. 62-197052 and 62-197056).

<Problems to be Solved by the Invention> In such a conventional technique, there are the following problems.

: It is difficult to secure space, which is an obstacle to running paper.

: It is difficult to cover the surface of the rotating disk with a transparent protective film as a practical problem.

: When scanning a sensor, the cable may be broken, and the cable is often long, which makes it vulnerable to noise and contributes to cost increase.

The present invention has been made in view of the above problems of the prior art, and its purpose is to provide an optical characteristic that has a simple structure and prevents the window provided on the upper part of the rotating disk from being soiled. A measuring device is provided.

Furthermore, the present invention provides an optical characteristic measuring device with a stain prevention mechanism that indirectly prevents stains on a rotating disk when measuring the color of paper.

Furthermore, by using a microwave oscillator (Gun diode) capable of transmitting and receiving in the upper and lower sensor units, it is possible to directly send and receive signals between the upper and lower units without using a cable for signal transfer as in the conventional case. In addition, an optical characteristic measuring device with high reliability and cost reduction is provided.

<Means for Solving the Problem> In order to achieve such an object, the present invention provides a method for measuring an object to be measured which travels in a certain direction between upper and lower detecting portions from one of the detecting portions. An apparatus for measuring optical characteristics of an object to be measured by irradiating light and detecting reflected light thereof, wherein a reference plate made of two colors is provided in a detection section on the back side of the object to be measured. When a backing plate is provided to detect and measure the reflected light affected by the backing plate during the irradiation of the light, the surface of the other housing is placed in a certain range region of the housing surface at the upper position of the backing plate. The flat part of the part of the certain range region is formed lower than the position, an air purge port is provided on the side wall surface of the measured object running inlet formed, and the air purge port is provided on the measured object running outlet side. Air that derives the air ejected from A recess formed with a lead-out port, and 2 along with the movement of the backing plate above the backing plate in the recess.
A window formed of a transparent member having a shape in which only one of the colors can be seen and arranged without a step with the plane position of the recess, and the surface is the plane position of the recess during measurement of the object to be measured. A window which can be stored in a state without a step, and which can be stored in the original position after the rotation is finished after the cleaning surface is raised to the plane position of the concave portion by the lifting mechanism during non-measurement and then rotated. It is characterized by using a wiping mechanism and a structure consisting of.

The optical characteristics of the object to be measured by irradiating the object to be measured traveling in a certain direction between the detection parts provided above and below with light from one of the detecting parts and detecting the reflected light. In a device for measuring, when a reference plate for dirt compensation provided on one side of the upper and lower detectors is provided, in the detector of the detector on the same side or the opposite side to the reference plate for dirt compensation, In order to monitor the stain on the reference plate, a reference plate on which a monitor color different from that of the reference plate for stain compensation is formed is provided, and stain compensation is achieved by taking measures of the stain degree based on the difference in color. It is characterized by being configured as follows.

<Operation> A backing plate composed of two colors is provided in, for example, the lower detection unit arranged on the back side of the measured object traveling in a certain direction, and at this time, light from a light source provided on the upper side of the measured object is provided. When measuring the optical characteristics of the DUT by detecting the reflected light when the backing plate comes to the back side of the DUT when the DUT is illuminated at a specified incident angle, A window portion made of a transparent member, which is independent of the rotating disk, is provided at a position where it is located, and an air purge is performed at the same time as air purging for preventing dirt and removing dirt on the window portion. Since it is not possible to completely prevent sticky stains and the like only by air purging, it is necessary to consider such stains in consideration of such cases. For this reason, dirt is less likely to adhere to the upper surface of the window due to the air purge (prevention)
In this way (of course, for non-adhesive ones, this can be used to prevent stains). Furthermore, for example, the sensor head is ejected from the web at regular intervals to calibrate the device (AUTCAL).
From the mechanism that can mechanically wipe this window at the timing of performing the measurement (in addition to this time, depending on the case, the measurement is stopped, or during the measurement is stopped, an external operation means (not shown) is arbitrarily used). The above-mentioned window wiping mechanism is operated to remove dirt from the window and at the same time prevent it.

Regarding transmission and reception of signals between the upper and lower sensor units, the Gunn diode and its driving circuit and receiving circuit are installed in the units facing each other with the paper sandwiched therebetween.

By arranging the reference plate to have a double structure and to use the other as one comparison plate, it is possible to compensate for one reference plate when it is soiled by dust or the like. You can

<Example> An example will be described with reference to the drawings.

FIG. 1 is a structural diagram showing an embodiment of the optical characteristic measuring device of the present invention, and FIG. 2 is a diagram showing a concrete example of the main part of FIG. 1, and in particular, FIG. The figure and the figure (B) are the top views seen from the arrow X direction of the figure (A).

In FIG. 1, reference numeral 1 is an upper detection unit, and 2 is a housing of the upper detection unit 1. In the housing 2, a light source 4 that irradiates the surface of the sheet-shaped paper 3 with a predetermined incident angle (for example, 45 °), a rotating sector 5 that intermittently blocks the irradiation light, and a vertical direction of the paper 3 An image in which a lens 6 that collects reflected light, a spectroscope 7 that disperses the condensed reflected light into a spectrum, and a plurality of photodetector elements that are installed in the focal plane of the spectroscope 7 and are arranged in the wavelength distribution direction of the spectrum A sensor 8 and a signal processing unit 9 for processing detection signals from the image sensor 8 are housed.

Reference numeral 10 is a lower detection unit arranged on the back side of the paper 3, and 11 is a housing of the lower detection unit 10. In this case, for example, a circular plate is divided into two, and a black plate having a reflectance of 0.5% or less and a white plate having a reflectance of about 89% are provided, and these are arranged on the back surface of the paper 3 at regular intervals. A disk-shaped rotating disk 12, a motor 13 for rotating the rotating disk 12 to switch the color, and a window made of a transparent member independent of the rotating disk in a portion located above the rotating disk. It is composed of parts 14 and the like. The main part of the present invention of the lower detector will be described below with reference to FIG.

In FIG. 2, in a certain range area around the window portion 14 (that is, a certain range area on the surface of the casing at the upper position of the rotating disk), it is shown in FIG. As described above, the flat surface portion of the certain range region is formed in the concave portion 15 low. An air outlet for discharging air ejected from an air purge port, which will be described later, is formed in the recess 15 in a shape having a certain inclination on the outlet side of the paper 3 (the measured object traveling outlet side, left side in the figure). 15a is formed, and the air jetted from the air purge port 16 provided on the side wall surface of the object running inlet on the opposite side (right side in the figure) to prevent dirt and remove dirt on the window portion 14 flows into the paper flow. The air flows along the arrow F and is smoothly discharged from the air outlet 15a. With respect to 17, since it is not possible to completely prevent adhesive stains and the like that adhere to the window portion 14 only by air purging, consider such a case and consider any stains. It is a window wiping mechanism provided as necessary. At this time, the window 14 and the window wiping mechanism 17 are embedded in the bottom of the recess 15 during the normal measurement of paper, and the surface thereof is stored in a flat position with respect to the flat position of the recess, that is, flat. However, at the time of non-measurement, the cleaning surface is raised to the concave plane position by the lifting mechanism (not shown) and then rotated on the window portion, and after the rotation is completed, it is stored in the original position. Incidentally, the window portion 14 is arranged on the upper portion of the rotating disc in such a shape that only one of the two colors associated with the movement of the rotating disc can be seen, and there is no step with the concave plane position.

When the window wiping mechanism 17 is operated, as described above, the lifting mechanism raises it in the direction indicated by the arrow α as indicated by the broken line in FIG. Rotate as indicated by β. This rotation is usually reciprocated a plurality of times. After this, it is stored in the original position. The window wiping mechanism 17 is arranged at the position shown by the solid line in FIG. 2, but this may be installed as shown by the alternate long and short dash line in FIG. It is better to make it as shown in the figure because of the relationship with the direction of air flow.

By configuring as described above, during normal measurement, only air purging is performed to prevent the adhesion of dirt to the sticky things on the upper surface of the window portion 14 by air (preventive treatment) as much as possible. For sticky substances, this alone can prevent stains, and for the stains that could not be removed by just this air purge, the sensor head should be ejected from the web at regular intervals to calibrate the device. , The window wiping mechanism 17 housed in order to prevent dirt is lifted → rotated to mechanically wipe the window section 14 to remove stains on the window section that could not be removed by air purging. At the same time, the dirt is prevented for the next measurement period.

As a result, since the window portion is not contaminated, the reflected light from the paper 3 detected when the black plate is backed and the reflected light from the paper 3 detected when the white plate is backed. From the ratio of the ratio and the ratio, the paper 3 can be measured stably, efficiently and accurately.

By the way, in the above-mentioned example, the contamination itself of the rotating disk (which is a kind of reference plate) 12 itself is not considered at all. That is, although the case where the stain on the window portion 14 existing thereabove is taken into consideration, the case where a function for compensating for the stain on the rotating disk itself is provided separately from this is also provided. You can think at the same time.

As such a configuration, for example, a new reference plate (comparison plate) is separately prepared, and at the time of calibration, the reflectance (or color) of the reference plate is measured to detect the contamination state of the rotating disk for compensating the contamination. You can think of what to do. At this time, the installation location of the additional new reference plate may be variously considered.For example, in the upper detection section, the reference surface and the reference surface whose reflectance is known as shown in Japanese Utility Model Laid-Open No. 63-141447 are cut. It may be arranged as a rotating sector having a notch and rotating in a plane parallel to the paper 3, or alternatively, the applicant of the present application previously filed Japanese Patent Application No. 1-181853 (color). As shown in Fig. 2), a horizontally slidable reference plate can be installed in the upper detection part, and this reference plate can be installed so that it slides to the position where the light from the light source illuminates during calibration. For example, the rotary disc and the other reference plate are provided with a certain notch so that the rotary disc of FIG. Synchronize calibration and measurement for It can also be configured to. Of course, other installation configurations (ideally, if a pair of reference plates are housed in the same place have the same dirt adhesion condition, etc., it is even better. A separate reference plate may be arranged so that it can be measured in parallel. The characteristic feature of the present invention is that the reference plate used for dirt compensation (in this case, the detection of the lower side). (A rotating disk provided on the part) and a reference plate (for dirt monitor) used to monitor whether or not the reference plate is soiled.
At this time, the two reference plates are made to correspond to different colors, for example, "white" which is a stain compensation color and "gray" as a stain monitor color. It should be structured and structured so that the stain degree can be compensated by taking the measure of the stain degree based on the above).

Thus, the stain is compensated using the reference plate used for the stain compensation, and then the color (or reflectance) of the stain monitor reference plate is measured. Now, the measured values of the color of the monitor reference plate when both reference plates are clean are L ₀ , a ₀ , b _0, and the measured value of the color of the monitor reference plate after online use is L ₁ , Let a ₁ and b ₁ be “L ₁ −
The relations L ₀ "," a ₁ -L ₀ "," b ₁ -b ₀ "depend on dirt.
Therefore, if an alarm is issued when these relationships become larger than specified values, it can be seen that the reference plate used for the stain compensation, that is, the rotating disc 12 in FIG.

In the above description, the sheet-like material is described as paper, but it goes without saying that the invention is not limited to this.

<Effect of the Invention> Since the present invention is configured as described above,
The following effects are achieved.

: Reflected light from the sheet-like object to be detected when the black plate is backed and the object to be measured detected when the white plate is backed so that the window does not become dirty The ratio of the reflected light to the reflected light enables stable and efficient measurement of the object to be measured and accurate measurement.

: Since it is possible to monitor the stain on the paper backing plate (or the reference plate used for stain compensation), it is possible to prevent incorrect stain compensation.

[Brief description of drawings]

FIG. 1 is a structural diagram showing an embodiment of the optical characteristic measuring apparatus of the present invention, and FIG. 2 is a concrete example of the main part of FIG. 1 ... Upper detection part, 3 ... sheet-shaped paper (measurement object), 4 ... light source, 10 ... lower detection part, 12 ... backing plate (rotating disc), 14 ... window part , 15 ...... recess, 16 ...... air purge port, 17 ...... window wiping mechanism.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-283849 (JP, A) Actually open 1-84048 (JP, U) Actually open 62-140437 (JP, U) Actually open 62- 197056 (JP, U) Actual opening Sho 62-186052 (JP, U) Actual opening Sho 62-197052 (JP, U) Actual opening Flat 2-20151 (JP, U) Actual public Sho 59-20667 (JP, Y1)

Claims (2)

[Scope of utility model registration request] 1. An object to be measured which irradiates a measured object running between fixed upper and lower detecting parts in a certain direction with light from one of said detecting parts and detects the reflected light. In an apparatus for measuring optical characteristics, a backing plate, which is a reference plate of two colors, is provided in a detection unit on the back side of the object to be measured, and is affected by the backing plate when the light is irradiated. When detecting / measuring the reflected light, in a certain range area of the housing surface at the upper position of the backing plate,
The flat portion of the part of the certain range region is formed lower than the surface position of the other housing, and the air purge port is provided on the formed side wall of the measured object running inlet, and the measured object running outlet is formed. A recess having an air outlet for discharging the air ejected from the air purge port on the side, and a shape in which only one of the two colors associated with the movement of the backing plate can be seen above the backing plate of the recess. And a window portion made of a transparent member which is arranged so as to have no step with respect to the plane position of the recess, and during measurement of the object to be measured, the surface is housed at the plane position of the recess without any step and is not measured. Sometimes, a structure including a window wiping mechanism capable of being swung on the window portion after the cleaning surface is raised to the plane position of the concave portion by the lifting mechanism and stored in the original position after the rotation is finished, Measurement of optical characteristics Location. 2. An object to be measured which travels in a fixed direction between detection sections provided above and below is irradiated with light from one of the detection sections, and the reflected light is detected to detect the object to be measured. In a device for measuring optical characteristics, when a dirt compensating reference plate provided on one side of the upper and lower detectors is provided, detection of a detector on the same side as or on the opposite side of the dirt compensating reference plate In order to monitor the dirt of the reference plate inside the part, a reference plate with a monitor color formed of a color different from that of the dirt compensating reference plate is provided, and the dirt level can be adjusted based on the difference in color. An optical characteristic measuring device characterized in that it is configured to compensate.