JPS628042A - Method for judging surface sharpness of painted article - Google Patents

Abstract

PURPOSE:To make it possible to objectively judge the surface sharpness of an entire painted region, by projecting a picture pattern having regularily to the entire surface region of a painted article and photographing the projected picture pattern to calculate the sharpness degree of the picture pattern. CONSTITUTION:The light of a light source 9 is allowed to irradiate the reflective surface 3a of a reflective plate 3 to be reflected and the position of the reflective plate 3 is regulated so that the entire region of the painted surface 1a of a painted article 1 is irradiated with reflected light. As a result, when the painted surface 1a is irradiated with the light from the light source 9 reflected from the reflective surface 3a, the measure pattern 4 drawn on the reflective surface 3a is projected to the entire region of the painted surface 1a and photographed by a camera 10. When the whole of the painted surface 1a is rough, the sharpness degree of the measure pattern 4 taken by the camera 10 is low as a whole and, when painting has irregularity, the sharpness degree partially becomes low. As mentioned above, the quality of the sharpness of the entire region of the painted surface 1a can be easily judged in an extremely objective manner on the basis of the sharpness of the picked-up image of the measured pattern 4 projected to the painted surface 1a.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention is for determining the sharpness (gloss) of the surface of a painted object on which an image appears clearly, such as the painted surface of an automobile. Regarding the method.

(Prior art and its problems) A conventional method for determining the sharpness of the surface of a painted object is to use, for example, a small number drawn on the surface of the painted object with varying sizes. There was a method in which the image was projected onto a portion of the image, and the measurer read it visually, determining the sharpness value based on the scale of the number that could be read.

However, in such conventional methods, the surface that can be determined is limited to a part of the surface of the painted object, and it is difficult to determine the sharpness of the entire surface of the painted object. Furthermore, the sharpness value (judgment) may vary depending on the individual judge.

(Means and effects for solving the problems) This invention was made by focusing on such conventional problems.
By projecting a pattern with regularity over the entire surface of the painted object, taking a photograph of the projected pattern, and determining the sharpness of the pattern captured in the photograph, we can objectively evaluate the clarity of the entire surface of the painted object. It is determined based on the

(Example) The present invention will be explained below based on the drawings.

The accompanying drawing shows an example of an apparatus for carrying out the method of the invention. First, to explain the configuration, 1 in the figure
2 is a painted object (in this example, the bonnet hood of an automobile) whose sharpness of the painted surface (surface) la is judged, and 2 is a mounting table on which the painted object 1 is placed and fixed. 3 is a reflecting plate having a smooth reflecting surface 3a that reflects light well. On the reflective surface 3a of the reflective plate 3, a fold pattern (design) 4 is drawn with black lines at predetermined intervals over the entire area. The reflecting plate 3 is supported by a support means 5 and is positioned over the painted surface 1a of the painted object 1. The support means 5 consists of a base 6 and an arm 8 rotatably attached to the base 6 via a hinge 7.
By rotating the reflecting plate 3, the reflecting surface 3a of the reflecting plate 3 can be positioned at an appropriate position and angle with respect to the painted surface 1a of the painted object 1. 9 is a movable light that projects white light, and 10 is a camera.

The light from the light 9 is irradiated onto the reflective surface 3a of the reflective plate 3 and reflected, and the position of the reflective plate 3 is adjusted so that the reflected light irradiates the entire painted surface 1a of the painted object 1. As a result, when the light of the light 9 reflected on the reflective surface 3a illuminates the painted surface 1a, the fold pattern 4 drawn on the reflective surface 3a is reflected on the painted surface 1a.
It will be displayed throughout the entire area. This painted surface 1a
A camera 10 photographs the fold pattern 4 projected over the entire area.

If the entire painted surface 1a is rough, the sharpness of the fold pattern 4 shown in the photograph will be low overall, and if the coating is uneven, the sharpness will be low in some areas. In this way, based on the sharpness of the captured image of the crease pattern 4 reflected on the painted surface 1a, it is possible to easily determine whether the sharpness of the entire painted surface 1a is good or not, and without causing variations in judgment depending on the judge. Judgments can be made objectively. Furthermore, it is possible to easily detect irregularities, distortions, scratches, etc. on the painted surface.

(Effects of the Invention) As described above, according to the present invention, it is possible to objectively and easily judge the sharpness of the entire surface of a painted object, and also to eliminate irregularities, distortions, scratches, etc. on the surface of the painted object. can also be easily discovered.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of an apparatus for carrying out the method for determining sharpness of a painted object surface according to the present invention. ■・・・Painted object, 1a...Painted surface (surface) of painted object, 3...
...Reflector, 3a...Reflective surface of the reflector, 4...Fold pattern (design), 9...Light, 10...Camera.

Claims (1)

[Claims] The sharpness of the surface of a painted object is determined by projecting a pattern with regularity over the entire surface of the painted object, taking a photograph of the projected pattern, and determining the sharpness of the pattern reflected in the photograph. Features: A method for determining the sharpness of the surface of a painted object.