KR101910070B1 - Apparatus for inspecting component - Google Patents

Abstract

A component inspection apparatus according to the present invention includes a transparent panel on which at least one component to be inspected is placed, a camera unit provided on the transparent panel for capturing the component to be inspected, And a reflector that is provided at a lower portion of the transmissive panel and reflects the light passing through the transmissive panel toward the camera among the light provided by the illuminator, The light reflected by the component to be inspected and blocking the light entering the camera unit and being reflected by the reflection unit of the light passing through the transmission panel provided in the illumination unit and passing through the transmission panel again, Polarized light.

Description

[0001] APPARATUS FOR INSPECTING COMPONENT [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a component inspection apparatus, and more particularly to a component inspection apparatus for inspecting a position of a component to be inserted on a printed circuit board.

At least one printed circuit board is mounted in the electronic equipment to constitute a circuit, and electronic parts of various types and sizes are mounted on the printed circuit board. Here, the electronic component may mean electronic components such as an integrated circuit, a diode, a capacitor, a resistor, and a transistor, which can constitute a circuit on a printed circuit board.

In general, an assembly line for mounting a plurality of kinds of electronic components on a printed circuit board includes a component mounting apparatus and a component inspection apparatus. The component mounting apparatus performs a mounting operation for placing various kinds of electronic components on predetermined positions of the printed circuit board, and the component inspecting apparatus mounts the electronic components such as the mounting position of the electronic components and / Perform the task of checking the status.

Particularly, a general component inspection apparatus currently used for measuring the position of electronic components includes a component mounted on a top surface of a transparent glass panel, a back light panel mounted on the bottom of the glass panel, And the position of the component is inspected by taking a shadow of the component with a camera located on the top of the glass panel.

However, a conventional component inspection apparatus using a backlight panel can not connect an external power source to a backlight panel due to a structural problem. Therefore, the backlight panel provides illumination by an internal power source such as a battery. However, frequent occurrences of the backlight brightness change due to the life of the battery or the test interruption due to the power shortage during the test. In addition, it is difficult to adjust the brightness of the backlight, so that when the photographed image is too bright or dark, the image of the component is distorted, and sometimes it is difficult to accurately measure the position of the component.

A problem to be solved by the present invention is to provide a component inspecting apparatus capable of providing stable illumination and at the same time confirming the position of a definite part.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a component inspection apparatus including: a transparent panel on which at least one component to be inspected is seated; A camera unit provided at an upper portion of the transparent panel to photograph the part to be inspected; An illumination unit provided on the transparent panel to provide illumination toward the transparent panel and the part to be inspected; A reflector disposed at a lower portion of the transmissive panel and reflecting the light passing through the transmissive panel toward the camera unit, And a second polarizing filter for passing the light polarized by the second polarized light among light entering the camera unit, the first polarized light filter passing the light provided by the illumination unit in the same frame through the polarized light of the first polarized light, The light reflected from the inspection target part of the light provided by the illumination unit and blocking the light entering the camera unit and being reflected by the reflection unit of the light passing through the transmission panel provided in the illumination unit, Wherein the first prism sheet comprises a first prism sheet and a second prism sheet provided below the first prism sheet, wherein the first prism sheet comprises a first polarizing sheet And refracts and diffuses light passing through the transmissive panel toward the second prism sheet, and the second prism sheet Wherein the first polarizing filter is disposed between the illumination unit and the transmissive panel, and the first polarizing filter is disposed between the illumination unit and the transmissive panel, wherein the first polarizing filter is disposed between the illumination unit and the transmissive panel, And the second polarizing filter is disposed between the camera unit and the transmissive panel, wherein the first prism sheet has a plurality of first prisms having a triangular cross section facing upward, and the second prism sheet has a triangular cross section And a plurality of second prisms each having a plurality of second prisms facing downward.

According to one embodiment, the light provided by the illumination unit passes through the first polarized light filter, is polarized by the first polarized light, is reflected by the component to be inspected among the light polarized by the first polarized light, May be blocked by the second polarizing filter.

According to one embodiment, the reflector may reflect light passing through the transmissive panel through the first polarized light filter and polarized by the first polarized light into the second polarized light, and reflected toward the camera unit .

Other specific details of the invention are included in the detailed description and drawings.

The embodiments of the present invention have at least the following effects.

Since the illumination for capturing the position of the component is provided on the top of the transmissive panel, the illumination can be provided using a stable external power source.

Even if the camera and the light are located at the top of the part to be inspected, it is possible to obtain a shadow image of a clear part by using a polarizing filter.

The effects according to the present invention are not limited by the contents exemplified above, and more various effects are included in the specification.

1 is a view schematically showing an apparatus for inspecting parts according to an embodiment of the present invention.
2 is a view schematically showing a polarization unit of a component inspection apparatus according to an embodiment of the present invention.
3 is a view schematically showing a reflector according to a first embodiment of the present invention.
4 is a view schematically showing a reflection part according to a second embodiment of the present invention.
5 is a view showing a principle of component inspection using a reflector according to a first embodiment of the present invention.
6 is a photograph image without the polarizer attached according to the embodiment of the present invention.
FIG. 7 is an image taken with a polarizing portion according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Further, the embodiments described herein will be described with reference to cross-sectional views and / or schematic drawings that are ideal illustrations of the present invention. Thus, the shape of the illustrations may be modified by manufacturing techniques and / or tolerances. In addition, in the drawings of the present invention, each component may be somewhat enlarged or reduced in view of convenience of explanation. Like reference numerals refer to like elements throughout the specification.

In the present specification, the singular form includes plural forms unless otherwise specified in the specification. As used herein, the terms "comprises" and / or "made of" means that a component, step, operation, and / or element may be embodied in one or more other components, steps, operations, and / And does not exclude the presence or addition thereof.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" and the like, Lt; / RTI > can be used to easily describe the correlation between the two. Like reference numerals refer to like elements throughout the specification.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings for explaining a component inspection apparatus according to an embodiment of the present invention.

1 is a view schematically showing an apparatus for inspecting parts according to an embodiment of the present invention.

1, a component inspection apparatus 1 according to an embodiment of the present invention includes a photographing unit 10, a polarization unit 20, a transmission panel 30, a reflection unit 40, and a support frame 50 ).

The photographing unit 10 includes a camera unit 11, a lens unit 12, and an illumination unit 13.

The camera section 11 is a component for photographing the position of at least one inspection target part 60 and is provided on the inspection target part 60 and the transmission panel 30. [ The component 60 to be inspected is various electronic components mounted on a printed circuit board (not shown).

As the image sensing means of the camera unit 11, an image sensing element such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor) may be used.

Although FIG. 1 shows an example in which a single camera unit 11 is installed, a plurality of camera units 11 for photographing different positions may be provided.

A lens section 12 is provided below the camera section 11. [ The lens section 12 may be designed such that the focal distance thereof corresponds to the distance between the camera section 11 and the part to be inspected 60 and has a magnification at which a certain area of the transmissive panel 30 is formed as a photographed image . When a plurality of camera units 11 are provided, a plurality of lenses having different magnifications may be provided to diversify the images captured by the parts 60 to be inspected.

The illuminating unit 13 is installed on the upper side of the transmissive panel 30. The illumination unit 13 is a component that provides illumination for photographing the position of the component 60 to be inspected by the camera unit 11.

1, the illumination unit 13 is located below the lens unit 12, but the illumination unit 13 is not limited thereto. The illumination unit 13 may be disposed on the upper side of the transmission panel 30 separately from the camera unit 11, And may be installed at a position to provide illumination toward the transmissive panel 30.

In order to prevent the shadow of the inspection target component 60 caused by the height of the inspection target component 60 from being formed on the transmission panel 30, the illumination portion 13 is formed in a circular shape And a plurality of light sources (not shown) disposed therein. For this, the illumination unit 13 of FIG. 1 may include a plurality of light sources that surround the periphery of the lens unit 12 in a circular manner.

A polarizing portion 20 is provided under the lens portion 12 and the illumination portion 13. The polarization unit 20 is a component that allows the non-polarized light emitted from the illumination unit 13 to pass through the polarized light and allows only light polarized in a specific direction to enter through the lens unit 12, Will be described later.

Meanwhile, a transparent panel 30 is provided under the photographing unit 10 and the polarizing unit 20.

The transparent panel 30 provides a space in which at least one component to be inspected 60 is seated. The transmissive panel 30 can be formed by using a transparent material such as glass as a plate through which light can pass vertically.

The transmission panel 30 can be supported by the support frame 50. The support frame 50 supports the side of the transmission panel 30 and is provided at the lower part of the transmission panel 30 with the reflection part 40 .

The reflection unit 40 reflects light passing through the transmission panel 30 of the light provided by the illumination unit 13 and then passes through the transmission panel 30 and is incident on the camera unit 11 through the lens unit 13. [ And a detailed description thereof will be given later.

Hereinafter, the polarization unit 20 according to the embodiment of the present invention will be described in detail with reference to FIG.

2 is a view schematically showing a polarization unit of a component inspection apparatus according to an embodiment of the present invention.

2, the polarizing section 20 includes a filter frame 21, a first polarizing filter 22, and a second polarizing filter 23. [

The filter frame 21 is formed so that the second polarizing filter 23 is installed at the center and the first polarizing filter 22 is installed to both sides of the second polarizing filter 23 so as to surround the second polarizing filter 23. [ do.

The first polarizing filter 22 and the second polarizing filter 23 are formed to have a reciprocal polarization direction. Therefore, the light passing through the first polarizing filter 22 is polarized in the first polarization direction, the second polarizing filter 23 is polarized in the second polarization direction, and the first polarization direction and the second polarization direction are different from each other Polarized direction.

For example, the first polarizing filter 22 may be a P polarizing filter and the second polarizing filter 23 may be a polarizing filter with S. In this case, when the non-polarized light passes through the first polarizing filter 22, only the P-polarized light is emitted. When the non-polarized light passes through the second polarizing filter 23, only the S-polarized light is emitted. Therefore, the light which has passed through the first polarizing filter 22 and is polarized into P polarized light is blocked without passing through the second polarizing filter 23.

The first polarizing filter 22 is positioned below the illuminating unit 13 and the second polarizing filter 23 is located below the lens unit 12 in the parts inspection apparatus according to the embodiment of the present invention.

Therefore, the light provided in the illumination unit 13 passes through the first polarizing filter 22, is polarized to the first polarized light, and is irradiated toward the light-transmitting panel 30 and the part to be inspected 60. [ The light incident through the lens unit 12 is filtered by the second polarizing filter 23 and only the light polarized by the second polarized light is incident on the camera unit 11 through the lens unit 12.

Hereinafter, the reflectors 40 and 140 according to the embodiment of the present invention will be described in detail with reference to FIGS. 3 and 4. FIG.

3 is a view schematically showing a reflector according to a first embodiment of the present invention.

As shown in FIG. 3, the reflective portion 40 according to the first embodiment of the present invention includes a first prism sheet 41 and a second prism sheet 42.

The first prism sheet (41) has a plurality of first prisms (41a) having a triangular cross section on the upper surface. Accordingly, a first valley 41b is formed between neighboring first prisms 41a, and a plurality of first valleys 41b are formed parallel to each other.

The second prism sheet (42) has a plurality of second prisms (42a) having a triangular cross section on the lower surface. Accordingly, a second valley 42b is formed between adjacent second prisms 42a, and a plurality of second valleys 42b are formed parallel to each other.

A deflection pattern formed by the plurality of first prisms 41a and the plurality of first valleys 41b on the upper surface of the first prism sheet 41 is formed on the lower surface of the second prism sheet 42 by a plurality of second And may be formed perpendicular to the deflection pattern formed by the prism 42a and the plurality of second valleys 42b.

That is, the extending directions of the plurality of first prisms 41a formed in parallel with each other and the extending directions of the plurality of second prisms 42a formed in parallel to each other are perpendicular to each other.

The first prism sheet 41 passes through the transmissive panel 30 and refracts and diffuses the light incident on the reflective portion 40 to pass through the second prism sheet 42. The second prism sheet 42 reflects light passing through the first prism sheet 41 toward the transmission panel 30 again.

The inclination angle of the second prism 42a of the second prism sheet 42 may be formed at an angle at which the incident light passes through the first prism sheet 41 and causes total reflection to minimize light loss due to reflection.

In addition, since the deflection pattern of the first prism sheet 41 and the deflection pattern of the second prism sheet 42 are formed to be perpendicular to each other, when the light incident on the first prism sheet 41 is light polarized by P polarized light The light reflected by the second prism sheet 42 and passing through the transmission panel 30 becomes S polarized light. That is, the P-polarized light incident on the reflection portion 40 is converted into S-polarized light by the first prism sheet 41 and the second prism sheet 42, and is irradiated toward the transmission panel 30.

The reflective portion 40 according to the first embodiment includes the first prism sheet 41 having the function of refraction and diffusion and the second prism sheet 42 having the function of reflection separately, The light distribution of the light passing through the transmissive panel 30 is made uniform. This improves the image quality by making the light distribution of the image obtained by the camera unit 11 uniform.

4 is a schematic view illustrating a reflection unit according to a second embodiment of the present invention.

As shown in FIG. 4, the reflecting portion 140 according to the second embodiment of the present invention includes a single prism sheet, unlike the reflecting portion 40 according to the first embodiment.

The prism sheet has a plurality of prisms 140a having a triangular cross section on the lower surface thereof. Accordingly, a valley 140b is formed between neighboring prisms 140a, and a plurality of valleys 140b are formed parallel to each other.

However, unlike the second prism sheet 42 of the first embodiment, the deflection pattern of the prism sheet according to the second embodiment is formed so as to form a deflection angle? Of 45 degrees with the interface of the prism sheet. That is, the extending direction of the plurality of prisms 140a and the valley 140b is formed to be inclined at an angle of 45 degrees with respect to the boundary surface of the prism sheet.

In order to minimize light loss due to reflection, the inclination angle of the prism 140a may be formed at an angle at which light incident through the transmission panel 30 causes total reflection.

Further, when the light incident on the prism sheet is light polarized by P polarized light, the deflection pattern forming the deflection angle &thetas; of 45 degrees with the interface of the prism sheet converts the P polarized light into S polarized light and transmits it to the transmission panel 30 Reflection.

Unlike the reflecting portion 40 according to the first embodiment, the reflecting portion 140 according to the second embodiment does not include the first prism sheet 41 having the functions of refraction and diffusion, The light distribution of the light reflected by the reflective portion 40 is not uniform. However, since a single prism sheet is used, a compact structure can be realized as compared with the first embodiment, and manufacturing cost can be reduced.

Hereinafter, the operation of the component inspection apparatus according to the embodiment of the present invention will be described. For convenience of explanation, the component inspection apparatus using the reflector according to the first embodiment will be described with reference to the drawings.

5 is a view showing a principle of component inspection using a reflector according to a first embodiment of the present invention.

5, the non-polarized light L provided from the illumination unit 13 passes through the first filter 22 and is polarized by the first polarized light (hereinafter referred to as P polarized light). A part L1 of the P polarized light passes through the light projection panel 30 and is incident on the reflection part 40 and the other part L2 of the P polarized light is directly irradiated onto the part 60 to be inspected.

L1 passing through the light projecting panel 30 and entering the reflecting portion 40 is refracted and diffused by the first prism sheet 41 and is incident on the second prism sheet 42. The light incident on the second prism sheet 42 is totally reflected by the second prism 42a and then reflected upward toward the first prism sheet 41. At the same time, the second polarized light (hereinafter referred to as S polarized light) .

The light converted from the P-polarized light to the S-polarized light by the reflecting part 40 passes through the first prism sheet 41 and the light-transmitting panel 30 and forms a shadow area coinciding with the outer shape of the inspection target part 60 And passes through the second filter 23.

Since the second filter 23 is a filter that passes S polarized light and blocks P polarized light, the light converted from the P polarized light to the S polarized light by the reflective part 40 passes through the second filter 23.

On the other hand, L2 directly irradiated to the inspection target part 60 is reflected by the surface of the inspection target part 60 and is incident on the second filter 23. However, since L2 is P polarized light, it is blocked without passing through the second filter.

Therefore, the light incident on the camera unit 11 through the lens unit 12 is limited to L1, so that an image in which a clear shadow region of the inspection metabolic component 60 is formed is photographed.

FIG. 6 is an image taken without a polarizer according to an embodiment of the present invention, and FIG. 7 is an image taken with a polarizer according to an embodiment of the present invention.

6, in the case where the polarizing portion 20 is not attached, not only the L1 reflected from the lower portion of the light transmitting panel 30 by the reflecting portion 40 but also the light reflected from the surface of the inspection target component 60 Since the reflected L2 appears in the photographed image, the outline of the inspection target part 60 is not clearly distinguished.

7, when the polarizing portion 20 is attached, the L2 reflected from the surface of the inspection target component 60 is blocked from entering the lens portion 12, The black shadow area corresponding to the shadow area is clearly displayed and the boundary line of the shadow area is also clearly distinguished.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

1: parts inspection device 10: photographing part
11: camera part 12: lens part
13: illumination part 20: polarization part
21: filter frame 22: first polarizing filter
23: second polarizing filter 30: light projecting panel
40, 140: reflection part 41: first prism sheet
41a: first prism 41b: first valley
42: second prism sheet 42a: second prism sheet
42b: second valley 50: support frame
60: Inspection target part 140a: Prism
140b: Valley

Claims (3)

A transmission panel on which at least one component to be inspected is seated;
A camera unit provided at an upper portion of the transparent panel to photograph the part to be inspected;
An illumination unit provided on the transparent panel to provide illumination toward the transparent panel and the part to be inspected;
A reflector disposed at a lower portion of the transmissive panel and reflecting the light passing through the transmissive panel toward the camera unit, And
A first polarizing filter for passing the light provided by the illumination unit into the light polarized by the first polarized light in the same frame and a second polarized light filter for passing the light polarized by the second polarized light among the light entering the camera unit, And the light reflected by the reflective portion of the light passing through the transmissive panel, passes through the transmissive panel again, and is reflected by the reflective surface of the camera, And a polarizing portion through which light entering the light-
The reflector includes:
A first prism sheet and a second prism sheet provided below the first prism sheet,
Wherein the first prism sheet is polarized by the first polarized light and refracts and diffuses light passing through the transmissive panel toward the second prism sheet,
The second prism sheet converts light polarized by the first polarized light having passed through the first prism sheet into the second polarized light and reflects the polarized light toward the camera unit,
Wherein the first polarizing filter is provided between the illumination unit and the transmissive panel, the second polarizing filter is provided between the camera unit and the transmissive panel,
Wherein the first prism sheet has a plurality of first prisms having a triangular cross section facing upward, and the second prism sheet has a plurality of second prisms having a triangular cross section facing downward. The method according to claim 1,
Wherein the light provided in the illumination section passes through the first polarized light filter and is polarized by the first polarized light,
And the light reflected by the inspection target part of the light polarized by the first polarized light and entering the camera part is blocked by the second polarized light filter. The method according to claim 1,
Wherein the reflector converts light passing through the transmissive panel through the first polarized light filter and polarized by the first polarized light into the second polarized light and reflects the light toward the camera unit.

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