KR101594909B1 - Illumination device for inspecting plate panel glass - Google Patents

Abstract

The present invention discloses a lighting apparatus for large flat glass inspection. The illumination device of the present invention irradiates light to a whole area of a flat glass to inspect defects using a plurality of light sources and irradiates light with a uniform illuminance by using a single light source of the prior art, There is an effect that the accuracy of the defect inspection is improved. Particularly, the present invention is characterized in that a diffuser is disposed in a region where light output from a plurality of light sources is overlapped to reduce and diffuse the light irradiated on the flat glass to be inspected, There is an effect that it is possible to investigate.

Description

[0001] Illumination device for inspecting plate glass [0002]

The present invention relates to a lighting device, and more particularly to a lighting device for flat glass inspection.

Large flat glass contained in a large-sized TV or a large-size monitor is generally inspected for scratches on a large glass surface or the breakage of a glass part before it is assembled into a product or a product.

Such a method of inspecting a large flat glass is to irradiate a large flat glass with light, to photograph the reflected light using a CCD camera, to detect a scratch or breakage area of the surface through image processing of the photographed image A vision inspection method is used.

An example of a method of inspecting flat glass is disclosed in Korean Patent No. 10-1249121 entitled " Inspection System and Method for Identifying Surface and Body Defects in Glass Sheet ". As in Korean patent, the conventional glass inspection method is performed by irradiating light onto a glass surface using a single light source. In this case, distances from the center of the light source to the respective regions of the glass surface are different from each other , There is a problem that accurate inspection can not be performed because the illuminance varies in each region of the glass surface. Especially, in the case of large-sized flat glass, whose demand is rapidly increasing recently, such a problem is very serious.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lighting apparatus for flat glass inspection capable of uniformly illuminating light over a large area of a large flat glass during inspection of a large flat glass.

According to another aspect of the present invention, there is provided an illumination device for flat glass inspection, which irradiates a light source toward a cradle on which a flat glass is mounted, A plurality of light sources for irradiating the light source toward the glass; A transparent plate having a plurality of diffusers attached thereto for reducing and diffusing the transmittance of light output from the plurality of light sources so that the flat glass is illuminated with a uniform illuminance; And a frame part in which the plurality of light sources are installed so that light generated from the plurality of light sources is outputted through a diffuser installed in the transparent plate.

Also, in the above-described embodiment, the frame portion may be provided with a partition wall that crosses in the vertical direction, and the plurality of light sources may be installed at positions symmetrical to each other around the partition wall in the same number on both sides.

In the above-described embodiment, the plurality of light sources may include a first light source to a fourth light source, and the first light source and the fourth light source may be disposed on the right side upper portion and the lower right side of the frame portion, And the second light source and the third light source are respectively installed on the left upper surface and the left lower surface of the frame portion with respect to the partition wall and the center height and the light sources can control the light irradiation direction and the distance to the transparent plate material .

In addition, in the above embodiment, the first light source and the second light source may be provided on the upper surface of the frame portion, and the third light source and the fourth light source may respectively be provided on the bottom surface of the frame portion.

Further, in the above embodiment, the first light source and the second light source may be installed closer to the flat glass than the fourth light source and the third light source, respectively.

Further, in the above embodiment, a blocking wall for blocking a part of the light emitted from the light source is further provided between the front surface of the frame portion and the transparent plate, and the blocking wall has a lower portion And a central shielding wall extending by a predetermined length in the vertical direction from the center of the lower shielding wall and having a width in the horizontal direction by a predetermined length.

Further, in the above embodiment, the cradle is installed at an angle so that the distance between the mounted flat glass and the transparent plate is lengthened as the height increases, and the first light source and the second light source are arranged in the entire area of the flat glass And the third light source and the fourth light source can irradiate light to the upper region of the flat glass by the lower shielding wall.

In the above embodiments, the plurality of diffusers are attached to the region of the transparent plate through which the light irradiated to overlap the flat glass is passed by the first light source to the fourth light source, thereby reducing the intensity of light .

In addition, in the above-described embodiment, the plurality of diffusers may include: a first diffuser attached to an entire surface of the first light source and the second light source; A second diffuser having a higher transmittance than the first diffuser and adhering under the first diffuser; And a third diffuser attached to an area corresponding to an edge formed by the lower shielding wall and the central shielding wall.

Further, in the above embodiment, the first diffuser and the second diffuser are attached to the same surface of the transparent plate so that their boundaries are in contact with each other, and on the other surface of the transparent plate, the first diffuser and the second diffuser are in contact with each other A fifth diffuser positioned at a center line and overlapping the first diffuser and the second diffuser; And a fourth diffuser attached to the fifth diffuser in contact with the edge of the transparent plate and having a lower transmittance than the fifth diffuser.

The illumination device of the present invention irradiates light to a whole area of a flat glass to inspect defects using a plurality of light sources and irradiates light with a uniform illuminance by using a single light source of the prior art, There is an effect that the accuracy of the defect inspection is improved.

Particularly, the present invention is characterized in that a diffuser is disposed in a region where light output from a plurality of light sources is superimposed to reduce and diffuse the light irradiated on the flat glass to be inspected, thereby uniformly illuminating the entire region of the large flat glass There is an effect that it is possible to investigate.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1A is a diagram showing the overall configuration of a lighting apparatus for flat glass inspection according to a preferred embodiment of the present invention. FIG.
1B is a view showing the arrangement of light sources of a lighting apparatus for flat glass inspection according to a preferred embodiment of the present invention.
FIG. 1C is a view for explaining a light irradiation area of light sources installed on the upper part of the frame part in a state where a covering wall is provided on a front surface in a lighting device for flat glass inspection according to a preferred embodiment of the present invention.
FIG. 1D is a view for explaining a light irradiation area of light sources installed in a lower part of a frame part in a state where a covering wall is provided on a front surface in a lighting device for flat glass inspection according to a preferred embodiment of the present invention.
Fig. 2 is a diagram showing the overlapping relationship of light irradiated to the flat glass in a state where only the partition wall and the covering wall are provided in the frame portion. Fig.
3A is a view illustrating an example in which a plurality of diffusers are attached to a first surface of a transparent plate disposed on a front surface of a frame according to a preferred embodiment of the present invention, Fig. 6 is a view showing an area to be irradiated.
FIG. 4A is a view illustrating an example in which a plurality of diffusers are attached to a second surface of a transparent plate disposed on a front surface of a frame according to a preferred embodiment of the present invention, FIG. 4B is a cross- Fig. 6 is a view showing an area to be irradiated.
5 is a view showing a state in which light having passed through a plurality of diffusers is superimposed on each region of the inspection target flat glass.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1A is a view showing an overall configuration of a lighting apparatus for flat glass inspection according to a preferred embodiment of the present invention, and FIG. 1B is a view illustrating the arrangement of a light source of a lighting apparatus for testing flat glass according to a preferred embodiment of the present invention 1C and 1D illustrate a lighting apparatus for inspecting flat glass according to a preferred embodiment of the present invention. In FIG. 1C and FIG. 1D, in a state where a covering wall 120 is installed on a front surface, Respectively. As shown in Fig.

1A to 1D, a lighting apparatus for inspecting flat glass according to a preferred embodiment of the present invention includes a plurality of light sources (including a first light source 141 to a fourth light source 144 ) Is provided, and light is irradiated toward the large flat glass plate which is placed on the front stand 200. In the preferred embodiment of the present invention, the frame 110 is formed in a rectangular parallelepiped shape, but the shape of the frame 110 may be modified.

A shielding wall 120 and a transparent plate 130 are provided on the front surface of the frame 110 and a light output from the light source is uniformly illuminated on a large flat glass plate A plurality of diffusers 151 to 155 for reducing and diffusing the transmittance of light output from the first to fourth light sources 141 to 144 are attached. At this time, the shielding wall 120 and the transparent plate material 130 are installed in a direction perpendicular to the bottom surface of the frame portion 110, and the cradle 200 is installed at an angle to the front transparent plate material 130. That is, the mount 200 is installed at an angle such that the distance between the mounted flat glass and the transparent plate 130 becomes longer as the height increases.

Here, the transparent plate material 130 refers to a transparent plate material having good optical characteristics (high level of flatness and transparency and no color change when light passes). Typically, the glass plate can be used as a transparent plate, and in addition to the glass plate, plate-like transparent acrylic (PMMA), transparent polycarbonate and the like can be used as the transparent plate. Hereinafter, for convenience of explanation, a case where a glass plate is applied as a transparent plate will be described as an example. However, it should be noted that materials such as transparent acrylic (PMMA), transparent polycarbonate and the like which satisfy the above conditions may be used as a transparent plate.

Inside the frame 110, a partition wall 111 is vertically provided at the center of the frame 110 to separate the space inside the frame 110 into a left area and a right area. A first light source 141 and a fourth light source 144 are provided on the right side region and a second light source 142 and a third light source 143 are provided on the left side region, Is installed. The first light source 141 and the second light source 142 are disposed on the upper portion with respect to the center height of the frame portion 110. The third light source 143 and the fourth light source 144 are disposed on the frame portion 110). The first light source 141 and the second light source 142 are disposed on the upper surface of the frame unit 110 and the third light source 143 and the fourth light source 144 are disposed on the bottom surface The installation position and distance of the light source can be changed depending on the designing method and the position of the diffuser attached to the glass plate 130. [

Accordingly, the light source of the present invention is installed in the frame 110 so as to adjust the upward, downward, leftward and rightward irradiation directions of light, and the irradiation angle and the distance to the glass plate 130. For example, in the preferred embodiment of the present invention, the light sources 141 to 144 are installed to be capable of adjusting the upward and downward and leftward and rightward irradiation directions and angles of light by being coupled to the frame unit 110 in a rotating structure with a hinge, , And the distance from the glass plate (130) can be adjusted by moving the light source back and forth along a rail provided on the frame unit (110).

The first light source 141 and the second light source 142 are installed close to the glass plate 130 and the third light source 143 and the fourth light source 144 are disposed in the vicinity of the first light source The first light source 141 and the second light source 142 are mounted at a distance from the glass plate 130 relative to the first light source 141 and the second light source 142, 1D, the third light source 143 and the fourth light source 144 emit light from the first light source 141 and the second light source 142 at a relatively distance from the first light source 141 and the second light source 142, Is illuminated only in the upper region of the distant flat glass.

A shielding wall 120 is provided on the front surface of the frame 110. The shielding wall 120 shields light from the third light source 143 and the fourth light source 144, And light of the third light source 143 and the fourth light source 144 is irradiated to only the upper portion of the flat glass. The closure wall 120 of the present invention includes a lower closure wall 121 for blocking light from a lower end to a predetermined height and a lower closure wall 122 extending from a center of the lower closure wall 121 in a vertical direction by a predetermined length, As shown in Figs. 1A to 1D, and has a generally "ㅗ" shape, as shown in Figs. 1A to 1D. The shielding wall 120 may be provided between the frame 110 and the glass plate 130 and may be disposed on the front surface of the glass plate 130 such that the glass plate 130 is positioned between the frame 110 and the shielding wall 120. [ May be installed.

FIG. 2 is a diagram showing an overlapping relationship of light irradiated on the flat glass in a state where only the partition wall 111 and the closure wall 120 are provided in the frame part 110. FIG.

The cradle 200 on which the large flat glass is mounted is disposed at an angle to the front surface of the frame unit 110. Therefore, when only the first light source 141 and the second light source 142 irradiate light, The illuminance of the light reflected on the upper surface of the flat glass is relatively lower than that of the lower surface. Accordingly, the present invention increases the illuminance of the upper portion by illuminating the third light source 143 and the fourth light source 144 only on the upper portion of the flat glass.

2, a first region 210 in which light of the first light source 141 and a light of the second light source 142 are overlapped appears on the lower portion of the flat glass, A second region 220 in which light of the first light source 141, the second light source 142 and the third light source 143 are superimposed on the left side and a first light source 141, A third region 230 in which the light of the second light source 142 and the fourth light source 144 overlap is displayed and a fourth region 240 in which the second region and the third region are overlapped, 141 to the fourth light source 144 overlap each other.

In the case of the example shown in Fig. 2, the illuminance difference according to the region can be reduced compared with the conventional technique of simply irradiating a single light source, but still the discontinuity of illumination occurs at the boundary between the first region and the fourth region, There arises a problem in that the illuminance decreases as the region goes up.

In order to solve such a problem, the preferred embodiment of the present invention attenuates the intensity of light output from the light source to the glass plate 130 provided on the front surface of the light source so as to minimize the illumination of each area, And a plurality of diffusers 151 to 155 for diffusing and diffusing light.

3A is a view illustrating an example in which a plurality of diffusers 151 to 153 are attached to a first surface of a glass plate 130 installed on a front surface of a frame 110 according to a preferred embodiment of the present invention, FIG. 3A is a view showing a region irradiated with light passing through the diffuser shown in FIG. 3A. FIG.

3A and 3B, a first light source 141 and a second light source 142 are disposed on a first surface of the glass plate 130 so as to allow light emitted from the first light source 141 and the second light source 142 to pass therethrough, The diffuser 151 and the second diffuser 152 are provided at positions corresponding to the first light source 141 and the second light source 142, respectively. The first diffuser 151 and the second diffuser 152 are attached so that their boundaries are in contact with each other and the second diffuser 152 is attached to the first diffuser 151 with a higher transmittance than the first diffuser 151.

The third diffuser 153 is disposed at a position through which light generated from the third light source 143 and the fourth light source 144 installed below the frame unit 110 pass. Particularly, a part of the light generated from the third light source 143 and the fourth light source 144 is blocked by the clogging wall 120 installed on the front face. Therefore, the third diffuser 153 is provided on the lower clogging wall 121 And is attached to an area corresponding to an edge formed by the central blocking wall 122. [

As shown in FIG. 3B, the light passing through the diffusers shown in FIG. 3A is divided into three regions on the flat glass to be inspected. The upper region 310 includes a first diffuser 151 and a third diffuser 153 The intermediate region 320 is irradiated only with light passing through the first diffuser 151 and the lower region 330 is irradiated with only light having passed through the second diffuser 152 .

4A is a view illustrating an example in which a plurality of diffusers 154 to 155 are attached to a second surface of a glass plate 130 installed on the front surface of a frame 110 according to a preferred embodiment of the present invention, 4B is a view showing a region irradiated with light passing through the diffuser shown in FIG. 4A.

4A and 4B, the light emitted from the first light source 141 and the second light source 142 provided on the upper part of the frame unit 110 passes through the second surface of the glass plate 130, The diffuser 154 and the fifth diffuser 155 are provided at positions corresponding to the first light source 141 and the second light source 142, respectively. The fourth diffuser 154 and the fifth diffuser 155 are attached so that their boundaries are in contact with each other, and the fifth diffuser 155 is attached with a higher transmittance than the fourth diffuser 154.

A first diffuser 151 and a second diffuser 152 are attached to the opposite side of the fifth diffuser 155 and the fifth diffuser 155 is attached to the first diffuser 151 and the second diffuser 152. [ And overlaps with a partial area of the second diffuser 152, respectively.

Referring to FIG. 4B, the light passing through the fourth diffuser 154 is reflected (410) in the left and right edge regions of the region slightly lower than the center region of the vertical direction of the flat glass, and the light passing through the fifth diffuser 155 Is reflected in the center region 420 of the region slightly lower than the center region in the vertical direction.

In the preferred embodiment of the present invention, the first diffuser 151, the third diffuser 153, and the fourth diffuser 154 have a transmittance of 52% and the second diffuser 152 and the fifth diffuser 154 155) has a transmittance of 78%. However, it goes without saying that the transmittance can be changed according to design specifications.

FIG. 5 is a view showing a state in which light passing through a plurality of diffusers 151 to 155 is superimposed on each area of a flat glass to be inspected.

As shown in FIG. 5, the illuminator for flat glass inspection of the present invention includes a plurality of diffusers 151 to 155 having different transmissivities on a path through which light generated from a plurality of light sources passes, The intensity of light is attenuated and diffused in the course of passing through the plurality of diffusers 151 to 155, so that light of a uniform illuminance is displayed throughout the flat glass.

The present invention has been described with reference to the preferred embodiments. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

110 frame part 111 barrier rib
120 Screening wall 130 Transparent plate
141 First light source 142 Second light source
143 Third light source 144 Third light source
151 First diffuser 152 Second diffuser
153 Third diffuser 154 Third diffuser
155 Fifth diffuser 900 Cradle

Claims (10)

delete A lighting apparatus for flat glass inspection, which irradiates a light source toward a holder on which a flat glass is mounted,
A plurality of light sources for irradiating the light source toward the flat plate glass mounted on the cradle;
A transparent plate having a plurality of diffusers attached thereto for reducing and diffusing the transmittance of light output from the plurality of light sources so that the flat glass is illuminated with a uniform illuminance; And
And a frame part provided with the plurality of light sources so that light generated from the plurality of light sources is outputted through a diffuser installed in the transparent plate,
A plurality of light sources are installed at positions symmetrical to each other with the same number on both sides of the barrier ribs on both sides of the partition wall, And a light source for emitting the light. 3. The method of claim 2,
Wherein the plurality of light sources are composed of a first light source to a fourth light source,
The first light source and the fourth light source are respectively installed on the upper right portion and the lower right portion of the frame portion with respect to the partition wall and the center height and the second light source and the third light source are disposed on the lower surface of the frame portion Wherein the light sources are disposed on the left upper surface and the left lower surface, respectively, and the light sources are installed so that the light irradiation direction and the distance to the transparent plate material can be adjusted. The method of claim 3,
Wherein the first light source and the second light source are provided on an upper surface of the frame portion,
And the third light source and the fourth light source are respectively installed on a bottom surface of the frame part. The method of claim 3,
Wherein the first light source and the second light source are installed closer to the flat glass than the fourth light source and the third light source, respectively. 6. The method of claim 5,
A shielding wall is further provided between the front surface of the frame and the transparent plate to shield a part of light emitted from the light source,
The blocking wall
A lower shielding wall for shielding light from a lower end to a preset height, and
And a central shielding wall extending from a center of the lower shielding wall by a predetermined length in a vertical direction and having a horizontal width of a predetermined length. The method according to claim 6,
Wherein the first light source and the second light source irradiate light over the entire area of the flat glass,
Wherein the third light source and the fourth light source irradiate light to the upper region of the flat glass by the lower shielding wall. 8. The apparatus of claim 7, wherein the plurality of diffusers
Wherein the first light source and the fourth light source are attached to a region of the transparent plate through which light irradiated to overlap the flat glass passes, thereby reducing the intensity of light. 8. The apparatus of claim 7, wherein the plurality of diffusers
A first diffuser attached to an entire surface of the first light source and the second light source;
A second diffuser having a higher transmittance than the first diffuser and adhering under the first diffuser; And
And a third diffuser attached to an area corresponding to an edge formed by the lower shielding wall and the central shielding wall. 10. The method of claim 9,
Wherein the first diffuser and the second diffuser are attached to the same surface of the transparent plate so that their boundaries are in contact with each other,
A fifth diffuser disposed on the other surface of the transparent plate and having a boundary line at which the first diffuser and the second diffuser are in contact with each other and overlapping the first diffuser and the second diffuser; And
Further comprising a fourth diffuser attached to the fifth diffuser so as to be in contact with an edge side of the transparent plate and having a transmittance lower than that of the fifth diffuser.

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