JPH0714868Y2 - Lighting device for color-insensitive images - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a color-insensitive image illuminating device used for visual inspection of an object having protrusions, bristles, and leads of different colors,
In particular, the present invention relates to an illumination device for a color-insensitive image, which is most suitable for appearance inspection such as irregularity of bristles on toothbrushes, omission, etc.

[Prior Art] Conventionally, a color-insensitive image illuminating device has been used for visual inspection of an object having protrusions, bristles, and leads of different colors.
As conventional irradiation for this kind of inspection, inspection using background illumination, that is, using silhouette image, and irregularity of toothbrush bristles by the above-mentioned illumination by front irradiation have been performed.

In addition, in the inspection of colored leads and the like, white light is used to desensitize the color.

[Problems to be Solved by the Invention] However, the above-described conventional lighting device has a drawback that a sufficient silhouette cannot be obtained with transparent hair in the case of background lighting. Further, when opaque bristles and transparent bristles are mixed, color desensitization cannot be performed at all.

Also, in front lighting, it is greatly affected by the color of the pattern,
After all, there is a drawback that a stable image cannot be obtained for various patterns and colors.

Furthermore, in the case of performing color desensitization by using white light,
Since the beam diameter cannot be narrowed with ordinary white light, there is a drawback that good slit light cannot fill the same plane.

[Means for Solving the Problems] The present invention has been made in view of the above problems, and an object thereof is to fill the same plane with slit light that is most suitable for the appearance inspection of objects of different colors. In order to achieve the above, a plurality of laser light sources having different wavelengths, a beam splitter that splits the laser beam from the laser light source, a surface mirror that reflects the laser beam split by the beam splitter, and a laser that is reflected by the surface mirror A cylindrical lens that converts the beam into slit light is provided, and a plurality of laser beams having different wavelengths are configured to be slit light in the same plane.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a top view showing an embodiment of a color desensitized image lighting device according to the present invention. FIG. 2 is a side view showing an embodiment of the color desensitized image lighting device according to the present invention. In this embodiment, the laser light source 1 is a toothbrush in which different hairs are planted, and the description will be made on the basis of inspecting the unevenness of the hairs.

In FIG. 1, a laser light source 1 and a laser light source 2 are lasers having different wavelengths. For the laser light source 1, for example, He-
Ne laser is used, and for the laser light source 2, for example, Ar + laser is used. The laser beams 3 from the laser light source 1 and the laser light source 2 are split by the beam splitter 4, and are further incident on the surface mirror 5 and reflected. The laser beam 3 reflected by the front surface mirror 5 enters a cylindrical lens 6 and becomes a laser slit light 7. This laser slit light 7 is on the same plane.

The laser slit light 7 created in this way is
As shown in the drawing, by irradiating the object 8 slightly above the tip of the inspection object 8, the defect in which the hairs are projected upward can be caught by the camera 9.

Further, by adjusting the laser slit light 7 to the height of the tip of the bristles of the toothbrush, the defective cutting of the bristles of the toothbrush can be caught by the camera 9.

Further, the laser slit light 7 is provided below the tip of the toothbrush bristles.
By bringing in, the camera 9 can detect the toothbrush bristles protruding laterally.

The irregularities of the bristles of the toothbrush can be inspected by the procedure described above, but the image signal obtained by the camera 9 is used as an image processing device.
By processing at 10, defects can be inspected without depending on the hair color or the pattern color.

In order to simplify the optical axis alignment and improve the S / N ratio, the disc 11 combined with the interference filter 12 is rotated in front of the camera 9 to match the color of the laser light source 1.
A filter selection mechanism 13 for selecting 12 is added, or the laser beam 3 of the laser light source 1 or the laser light source 2 is added.
It is preferable to provide a shutter for opening and closing.

According to * done *, by making multiple lasers slit light in the same plane and filling the plane from each direction, it is possible to stably detect hairs and leads without depending on the color of the object. ..

In addition, since the laser is used, high S /
Slit light having an N ratio and an appropriate thickness, and maintaining a constant thickness in the target region, provides good characteristics for leads, hairs, and the like.

[Advantages of the Invention] As described above, the present invention provides a plurality of laser light sources having different wavelengths, a beam splitter for splitting a laser beam from the laser light source, and a surface for reflecting the laser beam split by the beam splitter. Since a mirror and a cylindrical lens that changes the laser beam reflected by the surface mirror into slit light are provided, and a plurality of laser beams having different wavelengths are configured to be slit light in the same plane, the objects of different colors It is possible to fill the same plane with slit light that is optimal for visual inspection.

[Brief description of drawings]

FIG. 1 is a top view showing an embodiment of a color desensitized image lighting device according to the present invention, and FIG. 2 is a side view showing an embodiment of a color desensitized image lighting device according to the present invention. 1 ... Laser light source 2 ... Laser light source 3 ... Laser beam 4 ... Beam splitter 5 ... Surface mirror 6 ... Cylindrical lens 7 ... Laser slit light 8 ... Inspected object 9 ... Camera 10 ... Image Treatment device 11 …… Disc 12 …… Interference filter 13 …… Filter selection mechanism

Claims (1)

[Scope of utility model registration request] 1. A plurality of laser light sources having different wavelengths, a beam splitter that splits a laser beam from the laser light source, a surface mirror that reflects the laser beam split by the beam splitter, and a surface mirror that reflects the laser beam. And a cylindrical lens that converts a laser beam into slit light, and a plurality of laser beams having different wavelengths are slit-lighted in the same plane.