JPH0829146A - Imaging apparatus for side surface of article - Google Patents

Abstract

PURPOSE:To provide an imaging apparatus for the side surface of an article, which can pick up the image of the side surface of the object article with a single imaging means without the impediment to the conveying of the object article even if an optical system is fixed. CONSTITUTION:A first reflecting means 11 reflects the light emitted from the side surface of an object article 1 toward the specified position in front of the front surface of the object article 1. A second reflecting means 21 reflects the light reflected from the first reflecting means 11 into the forward direction of the front of the object article 1. A imaging means 50 picks up the image of the side surface of the object article 1 by receiving the light reflected from the second reflecting means 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an article side surface image pickup device, for example, to an article side surface image pickup device for picking up an image of a side surface of an electronic component in order to inspect the surface of the electronic component.

[0002]

2. Description of the Related Art An apparatus has already been developed for picking up an image of a side surface of a rectangular electronic component, which has been conveyed to an image pickup position by an electronic part conveying line, by a single image pickup means. An apparatus of this type is described in Japanese Patent Laid-Open No. 5-87744.

That is, an endless prism having a right-angled isosceles triangular cross section is vertically movable at an image pickup position on a conveyance line. Then, when the rectangular electronic component stops at the image pickup position, the endless prism is lowered to be positioned around the electronic article and at a position just beside the electronic component. In this state, the light emitted from the side surface of the electronic article is reflected to the front side of the electronic article by the surface corresponding to the hypotenuse of the cross-sectional shape of the endless prism. The light reflected by the endless prism toward the front side of the electronic article is received by the imaging means. As a result, the side image of the electronic article is captured by the image capturing means.

[0004]

In the above conventional device,
In order to image the side surface of the electronic component, it is necessary to arrange the endless prism around the target article and at a position right beside the target component. However, if the endless prism is fixed around the target article and at the position just beside the target component,
Since the transportation of electronic components is hindered, the endless prism must always be kept at a position above the transport line and lowered when the electronic components are stopped at the image pickup position.

The present invention provides an article side surface image pickup apparatus capable of picking up an image of the side surface of a target article by one image pickup means and not hindering the conveyance of the target part even if the optical system is fixed. To aim.

[0006]

A first article side image pickup device according to the present invention is a first reflecting means for reflecting light emitted from a side surface of a target article toward a predetermined position in front of the front side of the target article. (1) second reflecting means for reflecting the light reflected by the reflecting means in the front direction of the front surface of the target article, and image pickup means for capturing a side image of the target article by receiving the light reflected by the second reflecting means. It is characterized by having.

The first reflecting means is arranged around the target article and in front of the position just lateral to the target article. Also, the second
The reflecting means is arranged at a front position in front of the target article. When the target article has a rectangular shape when viewed from the front, for example, one having a reflecting surface corresponding to the inward surface of the rectangular frame is used as the first reflecting means, and four square pyramids are used as the second reflecting means. Those having a reflecting surface corresponding to the outer surface of the side surface are used.

The second article side image pickup device according to the present invention is reflected by the first reflecting means and the first reflecting means for reflecting the light emitted from the side surface of the target article toward the predetermined position in front of the front surface of the target article. Second reflecting means for reflecting the reflected light in the front direction of the front of the target article, the light reflected by the second reflecting means and the light emitted from the front of the target article to thereby receive a side view and a front view of the target article. A single image pickup means for simultaneously picking up images of the target article, and a light image emitted from the front of the target article on the optical path until the light enters the image pickup means, and the front image of the target article is focused on the side image of the target article. It is characterized in that it is provided with an optical system lens for making it.

The first reflecting means is arranged around the target article and in front of the position just lateral to the target article. Also, the second
The reflecting means is arranged at a front position in front of the target article. The optical system lens is arranged in front of the second reflecting means. As the optical system lens, one that generates a virtual image of the front surface of the target article at a rear position with respect to the front surface of the target article is used. When the target article has a rectangular shape when viewed from the front, one having a reflecting surface corresponding to the inward surface of the rectangular frame is used as the first reflecting means, and four side surfaces of the truncated pyramid are used as the second reflecting means. The one having a reflecting surface corresponding to the outer surface is used.

[0010]

In the first article side surface image pickup device according to the present invention,
The light emitted from the side surface of the target article is reflected by the first reflecting means toward a predetermined position in front of the front surface of the target article.
The light reflected by the first reflecting means is reflected by the second reflecting means in the front direction in front of the target article. The light reflected by the second reflecting means is received by the imaging means.
As a result, the side image of the target article is captured by the image capturing means.

In the second article side image pickup device according to the present invention, the light emitted from the side surface of the target article is reflected by the first reflecting means toward a predetermined position in front of the front surface of the target article. The light reflected by the first reflecting means is reflected by the second reflecting means in the front direction in front of the target article. Second
The light reflected by the reflecting means is received by the imaging means. Further, the light emitted from the front surface of the target article is received by the image pickup means via the optical system lens. Therefore, the side image and the front image of the target article are simultaneously captured by the image capturing means. The optical system lens is provided to match the focus on the front image of the target article with the side image of the target article.

[0012]

1 and 2 show a first embodiment of the present invention.

FIG. 1 is a vertical sectional view of the article side image pickup device, and FIG. 2 is a plan view of a main part of the article side image pickup device.

The target article 1 is arranged on a conveyor line 2 such as a conveyor. The target article 1 is a transistor in this example, and has a square shape when seen in a plan view. The target article 1 has an upper surface (front surface), a lower surface (back surface), and four side surfaces.

A square frame 10 as viewed from above is arranged above the image pickup position of the target article on the transport line 2 and above the upper surface of the target article 1. The frame 10 is
It is arranged so that its center is located directly above the center of the target article 1 at the imaging position, and the four inward surfaces of the frame body 10 are parallel to the four side surfaces of the target article 1, respectively.

Further, a quadrangular pyramid 20 is arranged immediately above the target article 1 at the image pickup position. Quadrangular pyramid 20
Are arranged such that the four sides of the bottom surface thereof are parallel to the four inward surfaces of the frame body 10. The quadrangular pyramid 20 is
It is fixed in a cylindrical holder 30 whose lower part is closed. The holder 30 is made of a transparent material that transmits light.

The holder 30 is supported by a cylindrical support 40 arranged on the transfer line 2 so that the holder 30 can be raised and lowered so that the height position of the holder 30 can be adjusted with respect to the transfer line 2. Further, the quadrangular pyramid 2 is provided directly above the support 40.
The image pickup means 50 such as a video camera is arranged in a posture capable of picking up 0.

The inward surface of the frame 10 is provided with first reflecting means 11 for reflecting the light emitted from the four side surfaces of the target article 1 toward the four opposite side surfaces of the quadrangular pyramid 20. First
As the reflecting means 11, for example, a plane mirror is used.

The outer surface of each side of the quadrangular pyramid 20 has a first
A second reflecting unit 21 is provided that reflects the light reflected by the reflecting unit 11 upward and makes it enter the image pickup unit 50. The second reflecting means 21 is, for example, a quadrangular pyramid 20.
It is formed by vapor-depositing a metal such as aluminum on the four side surfaces. In such a case, for example, a prism is used as the quadrangular pyramid 20. As the quadrangular pyramid 20, a hollow quadrangular pyramid having no bottom surface may be used.

In the above structure, the transfer line 2
When the target article 1 comes to the upper imaging position, the light emitted from the side surface of the target article 1 is reflected by the first reflecting means 11 and enters the second reflecting means 21 formed on the four side surfaces of the quadrangular pyramid 20. To be done. The light incident on the second reflecting means 21 is reflected upward by the second reflecting means 21 and received by the image pickup means 50.

Therefore, as shown in FIG. 2, the side image Q of the target article 1 projected on the second reflecting means 21 on the four side surfaces of the quadrangular pyramid 20 is picked up by the image pickup means 50. A chain line 60 in FIG. 2 indicates an image pickup area of the image pickup means 50.

When the size of the target article sent to the transport line 2 changes, the position and focus of the side image of the target article projected on the second reflecting means 21 may be adjusted as follows.

When the holder 30 is moved up and down with respect to the support 40, the side image (photographed image) Q of the target article projected on the second reflecting means 21 is a quadrangular pyramid, as shown by the arrow in FIG. Two
Move in the direction toward the apex of the 0 side or in the opposite direction. Therefore, the side image Q is as close as possible to the apex of the quadrangular pyramid 20 within the range in which the entire side image Q of the target article is projected onto the second reflecting means 21 on the corresponding side surface of the quadrangular pyramid 20. Thus, the height position of the holding body 30 is adjusted. The side image Q is made as close as possible to the apex of the quadrangular pyramid 20, because the side image Q becomes larger as the side image Q is closer to the apex of the quadrangular pyramid 20. Also,
In order for the imaging area to be the minimum range including all side images Q,
The lens of the image pickup means 50 is exchanged and the focus is adjusted.

Referring to FIG. 4, the width A of one side surface of the target component 1 is set to 1 mm, and the light emitted from the side surface of the target article to the first reflection means 11 for guiding the light to the second reflection means 21. The incident angle α is 10 °. In this case, an example of the distance B between the facing surfaces of the first reflecting means 11, the height C of the quadrangular pyramid 20, and the apex angle β of the side surface of the quadrangular pyramid 20 are shown below.

Distance B between the opposing surfaces of the first reflecting means 11: 100 mm Height of the quadrangular pyramid 20 C: 10 mm Side angle α of the quadrangular pyramid 20: 80 °

The image picked up by the image pickup means 50 as described above is used, for example, for surface inspection of the side surface of the target component 1. FIG. 5 shows an example of a surface inspection method for the side surface of the target component 1.

FIG. 5A shows an image picked up by the image pickup means. In order to extract the regions of the four side images of the target component 1, the corners of the four side images of the target component 1 are detected by the template matching method or the like in the image data obtained by the image pickup means (FIG. 5). (B)). Next, the areas of the four side surface images of the target part 1 are extracted, and binarization processing is performed for each area (FIG. 5C). Next, after removing the noise (see FIG.
(D)) The presence or absence of a scratch is determined based on the binarized data for each area.

6 and 7 show a second embodiment of the present invention. 6, the same components as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In the second embodiment, the side surface and the top surface (front surface) of the target article 1 are simultaneously imaged by one image pickup means 50. In the second embodiment, a quadrangular pyramid base 200 is used instead of the quadrangular pyramid 20 of the first embodiment. The second reflecting means 201 is formed on the outer surfaces of the four side surfaces of the quadrangular pyramid base body 200. The second reflecting means 201 is
For example, it is formed by depositing a metal such as aluminum on the four side surfaces of the quadrangular pyramid base 200. In such a case, a prism is used as the quadrangular pyramid 200, for example. As the quadrangular pyramid base body 200, a quadrangular pyramid base body 200 that is hollow and does not have a top surface and a bottom surface may be used.

In the second embodiment, the target article 1 is located in the holder 30 just above the quadrangular pyramid base 200.
A convex lens 70 for aligning the focus on the top image with the focus on the side image of the target article 1 is arranged. The convex lens 70 is supported by the holder 30 so as to be able to move up and down by an elevator mechanism (not shown).

FIG. 8 shows an optical path until the light emitted from the upper surface of the target object 1 and the light emitted from the side surface of the target object 1 are received by the image pickup means 50. In FIG. 8, reference numeral 51 is a condenser lens of the image pickup means 50, and 52 is a light receiving surface of the image pickup means 50.

In the second embodiment, the light emitted from the side surface of the target article 1 is reflected by the first reflecting means 11 and enters the second reflecting means 201 formed on the four side surfaces of the quadrangular pyramid base 200. The light incident on the second reflecting means 201 is reflected upward by the second reflecting means 201 and is received by the image pickup means 50. Therefore, as shown in FIG.
The side surface image Q of the target article 1 projected on the second reflecting means 201 on the four side surfaces 01 is imaged by the imaging means 50.

The light emitted from the upper surface of the target object 1 is received by the image pickup means 50 via the convex lens 70. Therefore,
The top surface image of the target object 1 is also captured by the image capturing means 50.

The convex lens 70 is provided to bring the top image of the target article 1 into focus on the side image of the target article 1. That is, when the convex lens 70 is not provided, the light emitted from the upper surface of the target article 1 is emitted to the image pickup means 50 with respect to the optical path length until the light emitted from the side surface of the target article 1 is received by the image pickup means 50. The optical path length becomes short until the light is received, and the side image and the top image are out of focus. Therefore, by forming a virtual image of the upper surface of the target article 1 at a position below the upper surface of the target article 1 by the convex lens 70, the optical path length from the virtual image position of the upper surface of the target article 1 to the image pickup means 50 is determined. The optical path length from the side surface position 1 to the image pickup means 50 is made equal.

FIG. 9A shows an optical path until the light emitted from the side surface of the target article 1 is received by the image pickup means 50.
(B) shows an optical path until the light emitted from the virtual image position on the upper surface of the target article 1 is received by the image pickup means 50. In FIG. 9, reference numeral 51 denotes a condenser lens of the image pickup means 50.
In FIG. 9B, a point F indicates the focal point of the convex lens, a point P1 indicates the actual upper surface position of the target article 1, and a point P2 indicates the virtual image position of the upper surface of the target article 1.

When the size of the target article sent to the transport line 2 changes, the position and focus of the side surface image of the target article projected on the second reflecting means 201 are adjusted in the same manner as in the first embodiment. . Further, the height position of the convex lens 70 with respect to the holding body 30 may be adjusted so that the top image of the target article 1 is focused on the side image of the target article 1.

According to the first embodiment or the second embodiment, the side surface of the target article can be imaged by one image pickup means. Further, even at the time of image capturing, the first and second reflecting means can be arranged at a position that does not hinder the transport of the target article by the transport line, so that the target object is at the image capturing position as in the conventional example. It is not necessary to raise and lower the reflecting means each time. According to the second embodiment described above,
There is an advantage that the top surface and the side surface of the target article can be simultaneously imaged by one image pickup means.

In the above embodiment, the target component is a square when viewed from the plane, but the present invention can be applied to a target component other than the square when viewed from the plane. The shape of the target article is, for example, flat (front)
In the case of a circular shape when viewed from one side, one having a reflecting surface corresponding to the inward surface of the circular frame is used as the first reflecting means, and a reflecting surface corresponding to the outer surface of the side surface of the cone is used as the second reflecting means. Those that have are used. Further, when the shape of the target article is, for example, a triangle when seen from a plane, a first reflection means having a reflection surface corresponding to an inward surface of a triangular frame when seen from a plane is used. As the two reflecting means, one having a reflecting surface corresponding to the outer surface of the side surface of the triangular pyramid is used.

[0039]

According to the present invention, there is provided an article side surface image pickup apparatus capable of picking up an image of the side surface of a target article by one image pickup means and not hindering the conveyance of the target part even if the optical system is fixed. can get.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the structure of an article side surface image pickup device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a main part of the article side image pickup device of FIG.

[Fig. 3] By changing the height position of the quadrangular pyramid,
It is a figure which shows that the position of the side surface image of the target article imaged on the 2nd reflection means changes.

FIG. 4 is a configuration diagram for explaining a specific example of sizes and the like of a first reflector and a quadrangular pyramid.

FIG. 5 is an explanatory diagram for explaining a method of performing a surface inspection of the side surface of the target article based on the photographed side surface image of the target article.

FIG. 6 is a vertical cross-sectional view showing the structure of an article side surface image pickup device according to a second embodiment of the present invention.

FIG. 7 is a plan view showing a main part of the article side image pickup device of FIG. 6;

FIG. 8 is a schematic diagram showing an optical path until the light emitted from the side surface and the upper surface of the target article is received by the imaging means.

FIG. 9 is a schematic diagram showing an optical path until the light emitted from the side surface of the target article is received by the image pickup means and an optical path until light emitted from the virtual image position on the upper surface of the target article is received by the image pickup means. Is.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Target article 2 Conveyance line 10 Frame 11 First reflecting means 20 Quadrangular pyramid 21 Second reflecting means 30 Holding body 40 Supporting body 50 Imaging means 70 Convex lens 200 Quadrangular pyramid base 201 Second reflecting means

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location H04N 7/18 B (72) Inventor Yasushi Okuda 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Fumio Yasutomi 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (7)

[Claims] 1. A first reflecting means for reflecting light emitted from a side surface of the target article toward a predetermined position in front of the front surface of the target article, and light reflected by the first reflecting means in a front direction in front of the target article. An article side surface image pickup device, comprising: a second reflecting means for reflecting the light on the side surface of the object; and an image pickup means for picking up a side image of the target article by receiving the light reflected by the second reflecting means. 2. The first reflecting means is arranged around the target article in front of a position right beside the target article, and the second reflecting means is arranged in front of the front surface of the target article. Item side image pickup device. 3. The target article has a rectangular shape when viewed from the front, the first reflecting means has a reflecting surface corresponding to the inward surface of the rectangular frame, and the second reflecting means has four quadrangular pyramid outer surfaces. The article side image pickup device according to claim 2, which has a reflection surface corresponding to. 4. A first reflecting means for reflecting light emitted from a side surface of the target article toward a predetermined position in front of the front surface of the target article, and light reflected by the first reflecting means in a front direction in front of the target article. Second reflecting means for reflecting light on the object, and a single image pickup means for simultaneously picking up a side image and a front image of the target article by receiving the light reflected by the second reflecting means and the light emitted from the front surface of the target article, And an optical system lens arranged on the optical path until the light emitted from the front surface of the target article is incident on the image pickup means and for focusing the front image of the target article on the side image of the target article. A side image capturing device. 5. The first reflecting means is arranged around the target article and in front of a position right next to the target article, and the second reflecting means is arranged in front of the front surface of the target article.
The article side image pickup device according to claim 4, wherein the optical system lens is arranged in front of the second reflecting means. 6. The target article is rectangular when viewed from the front, the first reflecting means has a reflecting surface corresponding to the inward surface of the rectangular frame, and the second reflecting means is outside the four side surfaces of the truncated pyramid. The article side surface image pickup device according to claim 5, wherein the article side surface image pickup device has a reflection surface corresponding to a surface. 7. The article side image pickup according to claim 4, wherein the optical system lens generates a virtual image of the front surface of the target article at a rear position with respect to the front surface of the target article. apparatus.