JP2745088B2 - Method and apparatus for recording surface quality data - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for recording surface quality data for recording, as surface quality data, an inspection result of a change from a flat surface to a surface of a test sample.

[0002]

2. Description of the Related Art Conventionally, as a method for simply inspecting such surface quality, it has been practiced to irradiate sunlight or light of a fluorescent lamp to a test product and visually evaluate its reflection condition.

[0003]

However, in such a method, there is an individual difference in evaluation, and it was not possible to record the surface quality data.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to provide a method and an apparatus for recording surface quality data that can easily record an inspection result with respect to a change from a surface flatness.

[0005]

In order to achieve this object, the present invention provides a light emitting device which passes light through a slit which is long in the horizontal direction and has a gradation formed so that the luminance at the center in the width direction is relatively high. The surface of the test sample is irradiated with light from the oblique direction by the slit light source to be irradiated, the light irradiation area of the surface is imaged by an image sensor, and the image of the light irradiation area imaged by this image sensor is displayed on an image display device. With a printer that can monitor and record grayscale changes,
A desired image monitored is printed out.

[0006] An apparatus for carrying out this method includes:
On both sides of the base, a slit light source that irradiates light from the oblique direction toward the surface of the test article placed on this base, and a test from an oblique direction so that reflected light enters from the light irradiation area on the surface An image sensor for picking up an image of an article, and the slit light source is provided with a slit that is long in the horizontal direction and has a gradation formed so that the luminance of the central portion in the width direction is relatively high. An image display device that is supplied with an image signal and displays a light irradiation area and prints out a display image of the image display device,
And a printer capable of recording a change in shading is attached.

[0007]

When the surface of the test sample is irradiated with light from a slit light source in a diagonal direction from a diagonal direction, the reflected light is incident on an image sensor capturing an image of the light irradiation area. This allows
When the image is monitored by the image display device, when the surface is flat, the image becomes a strip with a linear gradation corresponding to the slit, and the width changes depending on the inclined state. Further, when the surface is curved, the image also becomes curved. In other words, the change state of the surface can be inspected by the change in the shape of the image and the relative change in the gradation width within the range, and the image shape with the gradation as the inspection result is printed out to the printer.

[0008]

1 and 2 show an apparatus for implementing a method for recording surface quality data according to the present invention. In the dark room 1, a base 2 having a horizontal surface on which a test article 3 is placed is arranged. A rail 5 for guiding the stands 6 and 6a is attached to a longitudinal end of the base 2 at a lateral side end thereof. Arms 7 and 7a whose vertical direction and rotational position can be adjusted are supported by the respective stands 6 and 6a.

At one end of the base 2 in the longitudinal direction, the arm 7 supports a slit light source 10 for irradiating light at a shallow angle of incidence toward an intermediate portion of the base 2.
On the arm 7a at the other end, a CCD camera 20 having a directional angle capable of imaging almost the entire area of the test sample 3 at an angle symmetrical with respect to the incident angle is supported as an image sensor.
As shown in FIG. 6, the slit light source 10 includes a filter 31 having a horizontal slit 11, and a straight tubular fluorescent lamp 30 having a length corresponding to the slit 11 is housed therein. A gradation is formed and the remaining portion is covered with a light-impermeable film 32. Thus, the upper and lower portions of the slit light are blurred, and the brightness around the image is gradually reduced.

Reference numeral 25 denotes an image display device which captures an image signal of the CCD camera 20 and displays a screen of a light irradiation area on the screen. Reference numeral 27 denotes an image printer capable of recording a relative change in shading, which captures a display image of the image display device 25 by a key operation and prints out the image on a recording sheet. In such a test apparatus, when the test article 3 is completely horizontal, as shown in FIG. 2, a strip-like slit light corresponding to the width of the slit 11 illuminates the middle portion of the test article 3,
The reflected light from the light irradiation area enters the CCD camera 20 and is imaged. Thereby, the image display device 25 includes:
A linear strip image 26 with shading is monitored. The width of the image 26 increases when the surface of the test sample 3 is inclined slightly downward from the horizontal state toward the CCD camera 20, and narrows when the surface is inclined upward.

When the specimen 3 is bent outward in the short direction as shown in FIG. 3, the light irradiation moves toward the CCD camera 20 from the intermediate portion toward the short direction on both sides. As a result, the image 26A also curves. As shown in FIG. 4, when curving inward, the image 26B curves in the opposite direction. Further, as shown in an enlarged manner in FIG. 5, when the specimen 3 has a waveform in the light irradiation area of the slit light source 10, an area in which reflected light cannot be incident on the CCD camera 20 occurs during that time, so that an image is formed. 26C will be two separate strips.

At the time of inspection, the specimen 3 is placed on the base 2, and the slide position of the stands 6, 6a and the height and the rotation position of the arms 7, 7a are adjusted to adjust the surface of the specimen 3. The inspection area is irradiated with light at an incident angle of, for example, about 15 °, and the reflected light is incident on the CCD camera 20 in a symmetrical direction at about 15 °. Thereby, the shape of the image on the display surface of the image display device 25 and the gradation pattern of the gradation are changed into the unevenness, the inclination, or the curved shape on the surface based on the strip shape with the horizontal flat gradation corresponding to the slit 11. By monitoring how it changes in response, surface quality can be inspected. Image display device 2
In 5, when the image printer 27 is operated in a state where the test state is properly set while checking the image, the image at that time is printed out and can be recorded as surface quality data.

[0013]

As described above, according to the present invention, quality inspection data with respect to the flatness of the surface of a test sample can be monitored as a change in the shape of an image, and there is no need to consider individual differences in inspection. Further, the surface quality of the entire light irradiable area can be continuously and finely confirmed by the change of the light and shade pattern in the shape of the image. With a printer capable of printing shades of an image, it is possible to record data that is highly accurate, reliable, easily created, and easily checked.

[Brief description of the drawings]

FIG. 1 is a perspective view of a surface quality data recording device according to an embodiment of the present invention.

FIG. 2 is a view for explaining the operation of the apparatus for a test specimen having a horizontal surface.

FIG. 3 is a diagram for explaining the operation of the apparatus for a test sample having an outwardly curved surface.

FIG. 4 is a view for explaining the operation of the apparatus for a test specimen having an inwardly curved surface.

FIG. 5 is a diagram for explaining the operation of the apparatus for a test sample having a corrugated surface.

FIG. 6 is a sectional view of a slit light source of the apparatus.

[Explanation of symbols]

 2 Base 3 Test product 10 Slit light source 11 Slit 25 Image display device 26-26C Image 27 Image printer

Claims (2)

(57) [Claims] 1. A surface of a specimen is irradiated with light from a diagonal direction by a slit light source that irradiates light through a slit formed in a gradation such that the luminance is long in a horizontal direction and a central portion in a width direction is relatively high. An image of the light irradiation area on the surface is captured by an image sensor, and the image of the light irradiation area captured by the image sensor is displayed on an image display device and monitored. A method for recording surface quality data, wherein the image is printed out. 2. A slit light source for irradiating light from a diagonal direction toward a surface of a test article mounted on the base on both sides of the base, and reflected light from a light irradiation area on the surface. In addition, an image sensor that captures the test sample from an oblique direction is disposed so as to be opposed to the slit light source, and the slit light source is long in the horizontal direction, and a gradation is formed so that the luminance of the central portion in the width direction is relatively high. An image display device, which is provided with a slit provided, and is supplied with an image signal of the image sensor to display the light irradiation area, and a printer capable of printing out a display image of the image display device and recording a change in shading. Recording apparatus for surface quality data.