JPH02202678A - Parts inspecting device - Google Patents

Abstract

PURPOSE:To discriminate the characteristic of parts by irradiating the observed surface of the parts to be inspected by slit light intersecting the contour line of the parts and in addition, intersecting a feature part at the middle, and setting a window for the reflected image of the parts, and observing a picture in the window. CONSTITUTION:An irradiation direction is set previously so that the slit light 8 goes along the longitudinal direction of this parts 14, and as a result, the light 8 comes to intersect the contour line of the end 18 of the parts, and in addition, intersect a polarity mark 17 at the middle. When reflected light 9 is image-picked up by a camera 2, discontinuity 19 appears at the part of the mark 17 in the reflected image 20, and the window extending over the nearly whole length of the reflected image is set. Brightness is measured as scanning in the lateral direction of the window, and polarity is discriminated according to relation in which direction of a center position the darkest part is positioned. Thus, the polarity or other characteristic is discriminated for the parts whose polarity is defined plainly or the parts of special construction or shape.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Use> The present invention relates to a component inspection device used to inspect characteristics such as one type of polarity and defects of components mounted on a board.

<Prior art> For example, to inspect the polarity of a component, the surface of the component to be inspected is illuminated in various ways to generate an image of the component, and the brightness distribution of the image is measured. The orientation of the part is determined by making a determination.

FIG. 8 shows a method for determining the polarity of a component 10, such as a tantalum capacitor. The entire package of this component 10 is black, and characters 12 and polarity marks 11 are printed in white on the surface. In such a part 10-
Image brightness distribution 13
, a brightness difference clearly appears between the white part of the polarity mark 11 and the black part of the package. Therefore, the polarity of the component 10 can be easily determined, and it is possible to detect which direction the component 10 is facing.

<Problems to be solved by the invention> However, such inspection methods can only be applied to the inspection of specific parts on which polarity marks are printed. It is difficult to apply this directly when the

Figure 9 shows a cylindrical part 1 called a glass tube diode.
4, the entire outer periphery of the metal body portion 15 is covered with a glass film 16, and a band-shaped polarity mark 17 indicating polarity is drawn on the surface of the glass film 16 so as to be biased to one side.

In the case of such a component 14, the surface is covered with a glass film 16, and the polarity mark 17 has a variety of colors, so the above inspection method cannot detect a sufficient distance between the polarity mark 17 and other parts. It is difficult to perform stable inspection because it is not possible to obtain a brightness difference.

In addition to these types of parts, there are also parts whose polarity is clearly indicated by cutting out one end of the package (specific examples will be given later), but it is difficult to apply the above method to such parts as well. be.

This invention was made with attention to the above problem, and it is possible to determine the polarity of parts whose polarity has been clearly indicated by various methods or parts with a special structure or form, and also to determine the polarity of parts other than polarity. The purpose of the present invention is to provide a new component inspection device that can also discriminate the characteristics of the parts.

<Means for Solving the Problems> In order to achieve the above object, the invention as set forth in claim (1) provides a method for inspecting a part to be inspected in which a characteristic portion having an uneven shape appears inside the contour line of the observation surface. a light projection means for irradiating the observation surface of the part with a slit light that intersects the contour line and intersects the characteristic portion in the middle; and an imaging unit for imaging the reflected light of the slit light from the inspected part. A component inspection device is constituted by the device and a determining device that sets a predetermined window for the reflected image obtained by the imaging device and determines the characteristics of the component from the image within the window.

In addition, in order to achieve the same object, in the invention described in claim (2), for a part to be inspected in which a characteristic portion having an uneven shape appears at an intermediate position on the contour line of the observation surface, the contour line is a light projecting means for irradiating a slit light along and intersecting the characteristic portion in the middle; an imaging means for imaging the reflected light of the slit light from the inspected component; and a reflected image obtained by the imaging means. A component inspection device is configured with a determining means that sets a predetermined window for the image and determines the characteristics of the component from the image within the window.

<Operation> When inspecting the polarity and other characteristics of a part to be inspected that has uneven features such as polar marks on the observation surface, a slit light is directed at a predetermined position and direction to the observation surface of the part to be inspected. When irradiating and capturing an image of the reflected light, there will be breaks in the reflected image corresponding to the characteristic parts, so
By setting a window on the reflected image and observing the image within the window, the characteristics of the component can be easily determined.

<Embodiment> FIG. 1 shows the overall configuration of a parts inspection apparatus according to an embodiment of the present invention.

In the figure, a light projecting device 1 irradiates a slit light 8 onto a component 7 to be inspected on a substrate 6, and a camera 2 images reflected light 9 of the slit light from the component 7 to be inspected.

The control device 3 inputs the video signal from the camera 2 and performs predetermined image processing on the reflected image to determine the characteristics of the inspected component 7, and also controls the light projection operation of the light projection device 1 and the imaging operation of the camera 2. Controlled by control signals. Note that the image memory 4 stores the reflected image, and the monitor 5 is for displaying the reflected image.

The light projecting device 1 and the camera 2 are located above the board 6, but in this case, if the projecting device 1 is positioned directly above the component 7 to be inspected, and the camera 2 is located diagonally above the component 7, Even if the substrate 6 is lifted due to bending or the like, the slit light 8 can be reliably irradiated to a predetermined position, and its reflected image can be reliably obtained.

FIG. 2 shows a cylindrical component 14 such as a glass tube diode.
The situation in which the position of the polarity mark 17 is being inspected is shown.

The polarity mark 17 is drawn around the surface of the glass film 16, and when this part 14 is observed from above,
The polarity mark 17 is present over the entire width at a position inside the contour line of one component end 18.

In the light projecting device 1 of this embodiment, the irradiation direction of the slit light 8 is set so as to follow the longitudinal direction of the component 14, and as a result, the slit light 8 is directed toward the component 14 along the contour of the component end 18. It intersects the line and intersects the polarity mark 17 in the middle.

This slit light 8 is reflected on the surface of the polar mark 17, but is transmitted through the glass film 16 and reflected on the internal metal body portion 15 in other parts. Therefore, when this reflected light 9 is imaged by the camera 2, the reflected image will have a break 19 at the polarity mark, as shown in FIGS. 3(1) and 3(2).

FIG. 3(1) shows reflected images 20 when the polar mark 17 is drawn in a light color that reflects light, including a reflected image 20a on the metal body portion 15 and a reflected image 20b on the polar mark 17. The reflected image 20c on the end of the component, which is the electrode portion, appears discontinuously.

FIG. 3 (2) shows a reflected image 20 when the polar mark 17 is drawn in a dark color that absorbs light.
The reflected image 20a on the metal body portion 15 and the reflected image 2 on the end of the component, which is the electrode portion, do not appear.
0c appears discontinuously.

FIG. 4 shows a state in which a window W for polarity determination is set in the reflected image 20 shown in FIG. 3(1).

This window setting is executed in the image processing procedure by the control device 3, and in the example shown in the figure, a window W is set that covers almost the entire length of the reflected image 20. After measuring the brightness distribution 21 as shown in FIG. 5 for the image within this window W, the control device 3 determines in which direction the center of gravity WG of the distribution 21 is located with respect to the center position S. The polarity is determined by

The window may be set to a length that almost matches the reflected image 20b on the polar mark 7, as shown in FIG. 4 (2). In this case, the window W' is scanned in the direction of the arrow in the figure. At the same time, the brightness within the window W' is measured, and the polarity is determined based on which direction the darkest part is located with respect to the center position.

FIG. 6 shows a part 23 whose polarity is clearly indicated by a notch 22.
The situation in which the position of the notch 22 is being inspected is shown.

The notch 22 is provided at the center of one end surface 24 of the component 23, and when the component 23 is observed from above, the notch 22 is located at an intermediate position on the contour line of the one end surface 24 of the component 23. There is.

In the light projecting device 1 of this embodiment, the irradiation direction of the slit light 8 is set so as to follow the width direction of the part to be inspected 23, and as a result, the slit light 8 is directed toward the part to be inspected 23 along the width direction of the part to be inspected. It is parallel to the contour line of the end face 24 and intersects with the notch 22 in the middle.

This slit light 8 is reflected on the surface of the component 23, and is reflected on the surface of the substrate at the notch 22 portion. Therefore, when the reflected light is imaged by the camera 2, the reflected image will have a break 25 at the notch 22, as shown in FIG. Note that in this embodiment, the reflected light from the board is blocked by the component 23 and does not reach the camera 2, so that it does not appear as a reflected image.

FIG. 7 shows a window W for polarity determination in this reflected image 26.
Indicates the state where is set. The length of this window W corresponds to almost the entire length of the reflected image 26, but is not limited to this.
A window W' having a length corresponding to the notch 22 may also be used. Note that the method of determining polarity using these windows w and w' is the same as described above, and its explanation will be omitted here.

Although each of the above embodiments is an example of determining the polarity of a component, the present invention can also be applied to determining characteristics other than polarity, such as whether or not a component has a defect such as a chip. can.

<Effects of the Invention> The present invention is as described above. Since the reflected image will be interrupted at characteristic parts, the characteristics of the part can be determined by setting a window on the reflected image and observing the image, and the polarity can be clarified using various methods. It is now possible to determine the polarity and other characteristics of parts with special structures and shapes.
A remarkable effect has been achieved in achieving the purpose of the invention.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the overall configuration of a component inspection device according to an embodiment of the present invention, FIG. 2 is a perspective view showing the state of polarity inspection of a glass tube diode, and FIG. 3 is an embodiment of the component inspection device shown in FIG. 2. Figure 4 is an explanatory diagram showing the reflected image obtained in Figure 4 is an explanatory diagram showing the situation where a window is set for the reflected image, Figure 5 is an explanatory diagram showing the brightness distribution, and Figure 6 is an explanatory diagram showing the polarity. Fig. 7 is an explanatory diagram showing a situation where a window is set for the reflected image obtained in the embodiment of Fig. 6, and Fig. 8 is a conventional polarity inspection. FIG. 9 is a plan view showing the structure of a glass tube diode. 1... Light projector 2... Camera 3...
·Control device

Claims (2)

[Claims] (1) A component inspection device for determining and inspecting the characteristics of a component to be inspected that has a characteristic portion that is uneven at an inner position of the contour line of the observation surface, the observation surface of the component to be inspected. , a light projecting means for irradiating a slit light that intersects the contour line and intersects the characteristic portion in the middle, and an imaging means for capturing an image of reflected light of the slit light from the inspected part; A component inspection device comprising: a determining means for setting a predetermined window for a reflected image obtained by an imaging means and determining characteristics of the component from the image within the window. (2) A component inspection device for determining and inspecting the characteristics of a part to be inspected that has a characteristic part that is uneven at an intermediate position on the contour line of the observation surface, which On the other hand, a light projection means for irradiating a slit light that follows the contour line and intersects the characteristic portion in the middle, an imaging means for imaging the reflected light of the slit light from the inspected part, and an imaging means 1. A component discriminating device comprising: discriminating means for setting a predetermined window for the reflected image obtained in the window and discriminating the characteristics of the component from the image within the window.