JP2999925B2 - Object side imaging device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

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

[0004]

In the above-mentioned conventional apparatus,
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 just beside the target component. However, if the endless prism is fixed around the target article and at a position just beside the target component,
Since the transfer of the electronic component is hindered, the endless prism must always be kept at a position above the transfer line, and the endless prism must be lowered when the electronic component stops at the imaging position.

An object of the present invention is to provide an apparatus for imaging a side surface of an article which can image the side of the object by one image pickup means and does not hinder the conveyance of the object component even if the optical system is fixed. Aim.

[0006]

According to a first aspect of the present invention, there is provided a first side-surface imaging apparatus for reflecting light emitted from a side surface of a target article toward a predetermined position in front of the front of the target article. (1) a second reflecting means for reflecting light reflected by the reflecting means in a forward direction in front of the target article, and an imaging means for receiving a light reflected by the second reflecting means to capture a side image of the target article. It is characterized by having.

[0007] The first reflecting means is disposed around the target article and forward of a position immediately beside the target article. Also, the second
The reflecting means is arranged at a front position in front of the target article. In the case where the target article is rectangular when viewed from the front, for example, one having a reflecting surface corresponding to the inward surface of a rectangular frame is used as the first reflecting means, and a quadrangular pyramid is used as the second reflecting means. One having a reflective surface corresponding to the outer surface of the side surface is used.

The second article side surface imaging apparatus according to the present invention comprises first reflecting means and first reflecting means for reflecting light emitted from the side face of the target article toward a predetermined position in front of the front of the target article. Second reflecting means for reflecting the reflected light in the forward direction of the front of the target article; receiving the light reflected by the second reflecting means and the light exiting from the front of the target article; Single imaging means for simultaneously capturing a side image and a front image of the object, an optical lens disposed on an optical path until light emitted from the front of the target article enters the imaging means, and a focus on the front image of the target article Is provided with adjusting means for matching the focus on the side image of the target article.

The first reflecting means is disposed around the target article and forward of a position immediately beside the target article. Also, the second
The reflecting means is arranged at a front position in front of the target article. The optical lens is arranged in front of the second reflecting means. As the optical lens, a lens that generates a virtual image of the front of the target article at a position behind the front of the target article is used. When the target article is rectangular when viewed from the front, a first reflecting means having a reflecting surface corresponding to an inward face of a rectangular frame is used as the first reflecting means, and a second reflecting means having four sides of a truncated pyramid is used as the second reflecting means. One having a reflective surface corresponding to the outer surface is used.

[0010]

According to the first aspect of the present invention, there is provided:
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 of the target article.
The light reflected by the first reflecting means is reflected by the second reflecting means in a forward direction in front of the target article. The light reflected by the second reflecting means is received by the imaging means.
Thereby, a side image of the target article is imaged by the imaging means.

In the second article side surface imaging device according to the present invention, 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 of the target article. The light reflected by the first reflecting means is reflected by the second reflecting means in a forward direction in front of the target article. The light reflected by the second reflecting means is received by the imaging means. Therefore, a side image and a front image of the target article are simultaneously imaged by the imaging means. The optical system lens is adjusted by adjusting means such that the focus on the front image of the target article matches the focus on 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 an article side image pickup apparatus, and FIG. 2 is a plan view of a main part of the article side image pickup apparatus.

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

A square frame 10 as viewed from a plane is arranged at a position above the target article imaging position on the transport line 2 and higher than the upper surface of the target article 1. The frame 10 is
The center is located right above the center of the target article 1 at the imaging position, and the four inward faces of the frame 10 are arranged so as to be parallel to the four side faces of the target article 1 respectively.

A quadrangular pyramid 20 is disposed directly above the target article 1 at the imaging position. Square pyramid 20
Are arranged such that the four sides of the bottom face are parallel to the four inward faces of the frame body 10, respectively. The quadrangular pyramid 20
It is fixed in a cylindrical holder 30 whose lower part is closed. The holder 30 is made of a transparent body that transmits light.

The holder 30 is supported by a cylindrical support 40 arranged on the transport line 2 so as to be able to move up and down so that the height position of the holder 30 with respect to the transport line 2 can be adjusted. The quadrangular pyramid 2 is located just above the support 40.
An imaging unit 50 such as a video camera is arranged in a posture capable of imaging 0.

On the inward face of the frame 10, there is provided a first reflecting means 11 for reflecting light emitted from four sides of the object 1 toward four opposite sides of the quadrangular pyramid 20. First
As the reflection means 11, for example, a plane mirror is used.

The outer surface of each side surface of the quadrangular pyramid 20 has a first
There is provided a second reflection unit 21 that reflects the light reflected by the reflection unit 11 upward and makes the light incident on the imaging unit 50. The second reflecting means 21 is, for example, a quadrangular pyramid 20
Formed by evaporating 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 quadrangular pyramid that is hollow and has no bottom surface may be used.

In the above configuration, the transport line 2
When the target article 1 comes to the upper imaging position, 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 faces of the quadrangular pyramid 20. Is done. The light incident on the second reflecting means 21 is reflected upward by the second reflecting means 21 and received by the imaging means 50.

Therefore, as shown in FIG. 2, the side images Q of the target article 1 projected on the second reflecting means 21 on the four side faces of the quadrangular pyramid 20 are captured by the imaging means 50. A chain line 60 in FIG. 2 indicates an imaging area of the imaging unit 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 an arrow in FIG. 2
It moves in the direction toward the vertex of the 0 side surface or in the opposite direction. Therefore, the side image Q is as close as possible to the apex of the quadrangular pyramid 20 within a range where the entire side image Q of the target article is projected on the second reflecting means 21 on the corresponding side of the quadrangular pyramid 20. Thus, the height position of the holder 30 is adjusted. The reason why the side image Q is made as close as possible to the vertex of the quadrangular pyramid 20 is that the side image Q becomes larger as the side image Q becomes closer to the vertex of the quadrangular pyramid 20. Also,
In order for the imaging area to be the minimum range including the entire side image Q,
The lens of the imaging means 50 is replaced to adjust the focus.

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 reflecting unit 11 for guiding the light to the second reflecting unit 21 is transmitted. The incident angle α is 10 °. In this case, an example of the interval B between the opposing 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 will be described below.

The distance B between the opposing surfaces of the first reflection means 11 is 100 mm. The height C of the quadrangular pyramid 20 is 10 mm. The vertex angle α of the side surface of the quadrangular pyramid 20 is 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 captured by the image capturing means. In order to extract the regions of the four side images of the target part 1, corners of the four side images of the target part 1 are detected by template matching or the like from the image data obtained by the imaging means (FIG. 5). (B)). Next, the regions of the four side images of the target component 1 are respectively extracted, and binarization processing is performed for each region (FIG. 5C). Next, after removing noise (FIG. 5)
(D)) The presence or absence of a flaw is determined based on the binarized data for each area.

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

In the second embodiment, the side surface and the upper surface (front) of the target article 1 are simultaneously imaged by one imaging means 50. In the second embodiment, a quadrangular pyramid 200 is used instead of the quadrangular pyramid 20 of the first embodiment. The second reflection means 201 is formed on the outer surface of the four side surfaces of the truncated quadrangular pyramid 200. The second reflecting means 201
For example, it is formed by depositing a metal such as aluminum on the four side surfaces of the truncated pyramid 200. In such a case, for example, a prism is used as the quadrangular pyramid 200. The truncated pyramid 200 may be hollow and have no top and bottom surfaces.

In the second embodiment, the target article 1 is placed in the holder 30 just above the truncated quadrangular pyramid 200.
A convex lens 70 is arranged to match the focus on the top image of the target object 1 with the focus on the side image of the target article 1. The convex lens 70 is supported on the holding body 30 so as to be able to move up and down by a lifting mechanism (not shown).

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

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

Light emitted from the upper surface of the target object 1 is received by the imaging means 50 via the convex lens 70. Therefore,
The upper surface image of the target object 1 is also imaged by the imaging means 50.

The convex lens 70 is provided to match the focus on the top image of the object 1 with the focus on the side image of the object 1. That is, when the convex lens 70 is not provided, the light exiting from the upper surface of the target article 1 is transmitted to the imaging section 50 with respect to the optical path length until the light exiting from the side surface of the target article 1 is received by the imaging section 50. The optical path length becomes shorter until light is received, and the focus between the side image and the top image does not match. 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 imaging unit 50 is determined. 1 is equal to the optical path length from the side surface position to the imaging means 50.

FIG. 9A shows an optical path until the light emitted from the side surface of the target article 1 is received by the imaging means 50.
(B) shows an optical path until light emitted from the virtual image position on the upper surface of the target article 1 is received by the imaging means 50. In FIG. 9, reference numeral 51 denotes a condenser lens of the imaging means 50.
In FIG. 9B, a point F indicates a focal point of the convex lens, a point P1 indicates an actual upper surface position of the target article 1, and a point P2 indicates a 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 the focus of the side image of the target article projected on the second reflecting means 201 are adjusted as in the first embodiment. . In addition, by adjusting the height position of the convex lens 70 with respect to the holder 30, the focus on the top image of the target article 1 may be adjusted to the focus on the side image of the target article 1.

According to the first or second embodiment, the side surface of the target article can be imaged by one imaging means. Also, at the time of imaging, the first and second reflecting means can be arranged at positions where they do not hinder the conveyance of the target article by the conveyance line. There is no need to raise and lower the reflecting means each time it comes. According to the second embodiment, further,
There is an advantage that the upper surface and the side surface of the target article can be simultaneously imaged by one image pickup device.

In the above embodiment, a square component as viewed from a plane is used as a target component. However, the present invention can be applied to a target component other than a square as viewed from a plane. The shape of the target article is, for example, flat (front)
In the case of a circular shape from the viewpoint, a member having a reflecting surface corresponding to an inward surface of a 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. Is used. Further, when the shape of the target article is, for example, a triangle when viewed from a plane, the first reflecting means having a reflecting surface corresponding to an inward surface of a triangular frame when viewed from a plane is used. (2) As the reflection means, one having a reflection surface corresponding to the outer surface of the side surface of the triangular pyramid is used.

According to the present invention, even when the size of the target article changes, the image of the front side and the side of the target article can be imaged simultaneously and in focus with a single imaging means. A device is obtained.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a configuration of an article side surface imaging device according to a first embodiment of the present invention.

FIG. 2 is a plan view illustrating a main part of the article side surface imaging device of FIG. 1;

FIG. 3 By changing the height position of the quadrangular pyramid,
It is a figure showing that a position of a side picture of a target article projected on the 2nd reflection means changes.

FIG. 4 is a configuration diagram for explaining a specific example such as the size of a first reflector and a quadrangular pyramid;

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

FIG. 6 is a vertical sectional view showing a configuration of an article side imaging apparatus according to a second embodiment of the present invention.

FIG. 7 is a plan view illustrating a main part of the article side surface imaging device of FIG. 6;

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Target article 2 Transport line 10 Frame 11 First reflection means 20 Square pyramid 21 Second reflection means 30 Holder 40 Support 50 Imaging means 70 Convex lens 200 Square pyramid 201 201 Second reflection means

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yasuo Okuda 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Fumio Yasutomi 2-5-2 Keihanhondori, Moriguchi-shi, Osaka JP-A-6-66531 (JP, A) JP-A-5-87742 (JP, A) JP-A-3-152408 (JP, A) JP-A-63-665 257880 (JP, A) JP-A-63-32358 (JP, A) JP-A-62-273403 (JP, A) JP-A-56-62508 (JP, U) JP-A-63-75042 (JP, U) (58) Field surveyed (Int.Cl. ⁷ , DB name) G01B 11/00-11/30 102 G01N 21/84-21/91 G06T 1/00-1/60 G03B 15/00 H04N 7/18

Claims (1)

(57) [Claims] 1. 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 of the target article, and light reflected by the first reflecting means on a front face of the target article. A second reflecting means for reflecting light in a forward direction, and a side image and a front image of the target article are simultaneously captured by receiving light reflected by the second reflecting means and light emitted from the front of the target article. Single imaging means, optical system lens arranged on the optical path until light emitted from the front of the target article enters the imaging means, and focus on the front image of the target article, focus on the side image of the target article An article side surface imaging apparatus comprising an adjusting means for matching, wherein the target article is rectangular when viewed from the front, and the first reflecting means is arranged around the target article and forward of a position immediately beside the target article. Inward face of rectangular frame The second reflecting means has a reflecting surface corresponding to the outer surface of four side surfaces of a truncated square pyramid arranged at a front position in front of the target article, and the optical system lens has a corresponding reflecting surface. An article side surface imaging device arranged in front of the second reflection means.