JP3540902B2 - Thin leaf flatness measuring device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an apparatus for measuring flatness of a thin leaf, and more particularly, to an apparatus capable of automatically and rapidly measuring the flatness of a thin leaf. In the present invention, flatness refers to the state of slack of the thin leaf itself.
[0002]
[Prior art]
When running a plastic thin body, etc., if the flatness of the thin body is poor, the thin body will flutter and cause a problem that the process will not be stable, so in the thin body manufacturing process, as part of quality control, It is necessary to measure the flatness of the thin body.
[0003]
As a conventional measuring method, for example, between two rolls, under a constant tension condition, the thin leaf is run, light is irradiated from obliquely above the thin leaf surface, and the reflected light is projected on the screen as an image, A method is known in which a measurer visually reads the number and area of the images and determines the area ratio, thereby continuously evaluating the slack portion.
[0004]
[Problems to be solved by the invention]
However, the above-mentioned method is insufficient for measuring flatness at the time of high-speed winding, such as that individual errors easily occur by a measurer, that eyes cannot be taken off during measurement, that the measurement speed cannot be increased, and the like. . The present invention has been made in view of such a problem, and an object of the present invention is to provide an apparatus that can automatically and quickly measure the flatness of a thin leaf body.
[0005]
[Means for Solving the Problems]
That is, the gist of the present invention is an apparatus for measuring the flatness of a moving thin leaf (1) , wherein the thin leaf (1) is a plastic film, is on a running surface of the thin leaf, and A light source (2) capable of irradiating the linear measurement target area (13) set in a direction intersecting with the running direction of the body from diagonally above, and being radiated from the light source and reflected by the linear measurement target area (13) The light (22) is received, and the reflected light intensity distribution based on the flatness in the length direction (X-axis direction) of the linear measurement target area (13) is converted into the luminance value data (Z) distribution. In accordance with the distance in the traveling direction (Y-axis direction), the control unit converts each of the brightness value data (Z) and the corresponding X-axis direction position data (X) and Y-axis direction distance data (Y) as a set of data. Sensor (3) that can be transmitted to (4), and transmission from sensor (3) Each of the obtained data is stored as a set of data, and a luminance value curve (51) of the X-axis direction distribution of the luminance value data (Z) in the stored data is imagined, and a point where the amplitude exceeds a certain value (the sag point (55) )) Or when only points (slack points (55)) where the displacement (54) from the baseline (53) exceeds a certain value are plotted on the X-axis-Y-axis coordinates, each slack point (55) Recognizes a range surrounding points that are close to each other within a certain distance as one continuous block-shaped pattern (57), calculates the area of each block-shaped pattern (57) as a slack area, and calculates the result. The present invention resides in a thin-sheet flatness measuring device mainly composed of a control section (4) for outputting.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the device of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a conceptual explanatory view of the measuring apparatus of the present invention, FIG. 2 is an explanatory view of a sag area (12) on a thin leaf body surface and individual sag wrinkles (11) included therein, and FIG. FIG. 4 is an explanatory diagram of the relationship between the slack area (12) and the slack point (55) of the thin leaf body, and FIG. 4 is obtained by continuously plotting only the plot corresponding to the slack point (55) in the thin leaf length direction. It is explanatory drawing which shows a mode of a block-shaped pattern (57).
[0007]
A flatness measuring device (hereinafter simply referred to as a measuring device) of the present invention is a device for measuring the flatness of a running thin leaf (1), and includes a light source (2), a sensor (3), and a control unit (4). ).
[0008]
In the present invention, the thin leaf (1) to be measured refers to a long object having surface characteristics and flexibility in which the presence of reflected light is visible among the reflected light, so-called film-like or It is a sheet-like material, examples of which include plastic film, plastic sheet, glossy paper, and metal foil.
[0009]
When the irradiation light (21) described later is irradiated on the surface of the thin leaf (1) and the reflected light on the flat portion of the irradiation surface is received by the sensor (3), the linear measurement target area (13) receives the light. Refers to an elongated virtual surface area mainly including the surface portion of the thin body (1) where the reflected light (22) is reflected. The direction of the surface area, that is, the linear measurement target area (13) is usually set to a direction orthogonal to the traveling direction of the thin leaf (1), that is, a width direction of the thin leaf, but may be an oblique direction. Further, the width is usually about several mm or less, and the length is usually the entire width of the thin leaf, but may be limited to a part of the width of the thin leaf depending on the purpose.
[0010]
The light source (2) is arranged so as to be able to irradiate light from obliquely upward toward the linear measurement target area (13), and is usually adjusted so that the center of the light source (2) is the center of the thin leaf width. If necessary, the position may be a position deviated from above the thin leaf running surface. The direction is adjusted so that light can be emitted from obliquely upward toward the linear measurement target area (13).
[0011]
It is preferable that the wavelength distribution of the irradiation light (21) of the light source (2) is adapted to the sensitivity characteristics of the light receiving element of the sensor (3) described later. The width of the irradiation surface irradiated from the light source (2) is set to be at least as large as it can cover the width of the linear measurement target area (13). It is preferable to make the width closer to the width of the shape measurement target area (13).
[0012]
The length of the light source (2) is appropriately selected in consideration of the shape of the sensor (3), and the total length of the light (22) reflected by the irradiation light (21) in the linear measurement target area (13) is transmitted to the sensor. It is selected so that it can be received by the arranged light receiving elements. For example, in the case where the arrangement of the light receiving elements of the sensor (3) is short and substantially concentrated at one point, a long rod-shaped or linear light source approximately twice as long as the linear measurement target area (13) is used. When (2) is suitably adopted and each light receiving element array of the sensor (3) is arranged at a length equal to the length of the linear measurement target area (13), the light source (2) is used as the linear measurement target. When the length equal to the length of the area (13) is adopted and each light receiving element array of the sensor (3) is arranged at least twice the length of the linear measurement target area (13), a point light source is used. (2) is adopted.
[0013]
The sensor (3) receives the reflected light (22) emitted from the light source (2) and reflected by the linear measurement target area (13), and the length direction (X-axis direction) of the linear measurement target area (13). Is converted into a luminance value data (Z) distribution based on the flatness of the image data, and the luminance value data (Z) and the corresponding X-axis corresponding to the distance in the running direction (Y-axis direction) of the thin leaf body are converted. The direction position data (X) and the Y-axis direction distance data (Y) are transmitted as a set of data to the control unit (4) via the cable (31).
[0014]
The sensor (3) incorporates a large number of light receiving elements arranged in a line and includes a signal transmission cable (31). The shape of the sensor is generally such that the light receiving elements are arranged in a short length, the area of the light receiving opening is small, and the whole size is compact, but the array length of the light receiving elements is long, for example, a line It may be the same as or twice as long as the shape measurement target area (13). The arrangement of the sensor (3) is adjusted to a position and a direction in which the light receiving element can receive the reflected light in the flat portion of the linear measurement target area (13) of the thin leaf (1).
[0015]
The control unit (4) mainly includes a data storage unit, a calculation unit, and an output unit. The data storage unit stores the set data transmitted from the sensor (3), and is provided so that the stored data can be read as needed by the operation unit. As a storage unit of the data storage unit, a storage unit that can be read at any time by an arithmetic unit described later is adopted, and examples thereof include a memory, a hard disk, and a floppy disk in a computer device, but are not limited thereto. Among them, a memory device or the like in a computer device can be suitably used, but it is more preferable that a device capable of permanently storing and storing such as a hard disk or a floppy disk is further provided as a data recording tool.
[0016]
The calculation unit simulates a luminance value curve (51) of the X-axis direction distribution of the luminance value data (Z) in the stored data, and as shown in FIG. 3, a point (sag point) whose amplitude exceeds a certain value, Alternatively, when only points (slack points) where the displacement (54) from the baseline (53) exceeds a certain value are plotted on the X-axis-Y-axis coordinates as shown in FIG. A range surrounding a point close to within a certain distance is recognized as one continuous block-shaped pattern (57), and the area of each block-shaped pattern (57) is calculated.
[0017]
The base line (53) in the brightness value curve (51) basically corresponds to a flat portion of the thin leaf body (1), and the amplitude portion corresponds to a slack wrinkle portion. The reason why such an amplitude portion occurs is not clear, but as shown in FIG. 2, when there is a slack wrinkle (11) in the linear measurement target area (13), the reflection plane of that portion has a flat portion. Since it changes from the reflection plane and the reflection direction shifts, if it is a flat portion, it is not received by the light receiving element at the position where it should receive the reflected light, and it may also receive the reflected light of another slack wrinkle part, As a result, it is considered that the light received by each light receiving element has an intensity distribution in the X-axis direction due to the state of the slack wrinkle of the thin leaf body, and has an intensity distribution.
[0018]
The point at which the value of the amplitude (52) exceeds a certain value or the point at which the displacement (54) from the baseline (53) exceeds a certain value is called a sag point (55), and It is an alternative to the sagging wrinkle. In addition, the constant value serving as the reference for the determination of the sag point is appropriately set according to the purpose of the measurement. For example, in the case of the determination of the amplitude (52), the brightness value of the baseline (53) is set to 10 %, And 5% in the case of displacement from the baseline (53).
[0019]
The above operation is repeated for each distance in the Y-axis direction of the thin leaf body (1), and when it is assumed that the sag point (55) is plotted and displayed on the X-axis-Y-axis coordinates, a large number of plots are formed. It is scattered to form a kind of pattern, and usually forms several streak patterns (56) corresponding to the slack wrinkles (11) of the thin body. At this time, a plurality of these streak patterns (56) may form a single continuous block pattern (57) as a whole.
[0020]
Whether or not the plurality of streak patterns (56) form one continuous block-like pattern (57) is determined by the distance between the positions of the plots constituting the streak pattern (56). When the distance between the plots is smaller than a fixed value (minimum flat distance), for example, 10 mm, which is appropriately set, the two slack points (55) are recognized as continuous plots, and The range surrounding the plot is determined as one continuous block pattern (57). The area of each continuous block pattern (57) determined in this way is calculated for the designated length of the thin leaf (1). At this time, it is preferable that the area distribution of the continuous block pattern (57), the slack area ratio in the thin leaf body area, and the like can be calculated as required. The above-mentioned block-shaped pattern can be considered to correspond to one continuous slack region (12) on the thin leaf (1).
[0021]
The output unit outputs a calculation result in the calculation unit. Since the calculation in the calculation unit is performed on the internal memory as a matrix of the brightness value data, a plot pattern diagram of the brightness value curve (51), the baseline (53), and the slack point (55) is represented by a visual figure. It is not necessary to be able to output to the above-mentioned output device, but it is preferable to be able to output to the output device such as a CRT display device, a liquid crystal display device, and a printer in parallel for monitoring the flatness of the thin leaf body during traveling. Further, when the plot of the brightness value data is output to the output device, the display color may be a monocolor, but a multi-color that can be displayed by changing the color or brightness according to the size of the brightness value data is further added. preferable.
[0022]
【The invention's effect】
As described above, according to the present invention, the flatness of a running thin leaf can be measured automatically, quickly and quantitatively, and can be displayed and recorded. In addition, there is no individual error in the measurement result by the person in charge of measurement. Further, if desired, the brightness value curve (51), the slack point plot, and the like are displayed on a CRT display device, a liquid crystal display device, or the like, so that the flatness of the running thin leaf can be monitored.
[Brief description of the drawings]
FIG. 1 is a conceptual explanatory view of a measuring apparatus of the present invention. FIG. 2 is an explanatory view of a sag area (12) on a thin leaf body surface and individual sag wrinkles (11) included therein. FIG. FIG. 4 is an explanatory diagram of a relationship between a sag area (12) and a sag point (55). FIG. 4 is a block-like pattern (57) obtained by continuously plotting only a plot corresponding to a sag point (55) in a thin leaf length direction. ) (Explanation of symbols)
1: thin leaf 11: sagging wrinkles 12: sagging area 13: linear measurement target area 2: light source 21: irradiation light 22: reflected light 3: sensor 31: cable 4: control unit 51: brightness value curve 52: amplitude 53: Base line 54: Displacement from baseline 55: Slack point 56: Stripe pattern 57: Block pattern

Claims (1)

An apparatus for measuring the flatness of a moving thin leaf (1) , wherein the thin leaf (1) is a plastic film, is on a running surface of the thin leaf, and intersects with a running direction of the thin leaf. A light source (2) capable of irradiating the linear measurement target area (13) set in the obliquely upward direction with light, receiving reflected light (22) from the light source and reflected in the linear measurement target area (13); The reflected light intensity distribution based on the flatness in the length direction (X-axis direction) of the linear measurement target area (13) is converted into the luminance value data (Z) distribution, and the thin-sheet body traveling direction (Y-axis direction) is converted. A sensor capable of transmitting the brightness value data (Z) and the corresponding X-axis direction position data (X) and Y-axis direction distance data (Y) as a set of data to the control unit (4) according to the distance. (3) Each data transmitted from the sensor (3) is grouped data. A luminance value curve (51) of the X-axis direction distribution of the luminance value data (Z) in the stored data is imagined, and a point where the amplitude exceeds a certain value (sag point (55)) or a base When only points (slack points (55)) where the displacement (54) from the line (53) exceeds a certain value are plotted on the X-axis-Y-axis coordinates, the respective slack points (55) are within a certain distance from each other. The control unit (4) which recognizes a range surrounding a point close to the pattern as one continuous block-shaped pattern (57), calculates the area of each block-shaped pattern (57) as a slack area, and outputs the result. ), Which is mainly composed of:

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