Anti-smudginess plane shadowless light illumination system

Abstract

The utility model relates to the technical field of light guide illumination equipment, aims to solve the problems that an existing shadowless light illumination system is poor in anti-pollution effect, and illumination images of an acquisition system are prone to interference after the front surface and the rear surface of protective glass have defects or are polluted, and provides an anti-pollution plane shadowless light illumination system. Comprising a light guide panel and protective glass, the protective glass is arranged on the upper side and / or the lower side of the light guide panel and used for protecting the light guide panel, and a lighting source is arranged on the side face of the light guide panel and used for generating light and coupling the light into the light guide panel. The light guide panel converts light transmitted in the light guide panel in a total reflection mode into light output downwards so as to illuminate an object. A light source blocking layer is arranged on the protective glass and is used for preventing light from entering the protective glass; according to the utility model, the identification and detection of defects on the surface of an object caused by defects or dirt interference on the surface of the protective glass are avoided, and the image interference of pollutants on an acquisition system is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of light-guiding lighting equipment, in particular to an anti-fouling planar shadowless light lighting system. Background Art

[0002] With the in-depth integration of the new generation of information technology and manufacturing, the manufacturing industry has undergone tremendous changes, gradually shifting from quantity expansion to quality improvement. There are many factors that affect product quality, such as appearance quality, functional quality, performance quality, etc. Users and manufacturers have higher and higher requirements for product quality. In addition to higher functional quality and performance quality, the requirements for appearance quality are also increasing year by year, that is, good surface quality. The use of automated and intelligent surface defect detection methods is an important means to balance quality and efficiency, that is, machine vision detection method.

[0003] Surface defect detection based on machine vision will be the main direction of future research and development. At present, there have been gratifying results in theoretical research and practical application of surface defect detection based on machine vision, but there are still some problems and difficulties.

[0004] Surface defect detection based on machine vision requires the use of a fill light product with uniform light to illuminate the object, and then the camera is used to capture the image. Therefore, there is an urgent need for an optical lighting product that can perform high-precision detection of defects on flat products, such as glass planes and film surfaces.

[0005] The traditional lighting system includes a light guide plate and a protective glass. The protective glass is laminated on the top of the light guide plate. The lighting source is arranged on one side of the light guide plate. The light enters the light guide plate from the side and is transmitted by total reflection in the light guide plate.

[0006] After the light emitted by the illumination light source enters the protective glass from the side of the protective glass, if there are defects or dirt on the surface of the protective glass, these defects and dirt will scatter the light energy transmitted by total reflection. Therefore, if there are any defects or dirt on the surface of the protective glass, it will be very obvious and become a bright spot, bright line or some bright pattern. These bright spots or bright patterns may be captured by the camera, thereby interfering with the recognition and detection of surface defects of the object.

[0007] Therefore, the existing shadowless lighting system has poor anti-pollution effect. When the front and rear surfaces of the protective glass are defective or contaminated by dust in the natural environment, human fingerprints, etc., it is easy to interfere with the lighting image of the acquisition system. Utility Model Content

[0008] The utility model aims to provide an anti-fouling planar shadowless light illumination system to solve the problem that defects or dirt on the protective glass of the traditional illumination system scatter the light energy transmitted by total reflection, thereby interfering with the recognition and detection of surface defects of the object.

[0009] The utility model is realized by adopting the following technical solutions:

[0010] The utility model provides an anti-fouling flat shadowless light illumination system, comprising a light guide plate and a protective glass, wherein the protective glass is arranged on the upper side and / or the lower side of the light guide plate, and the protective glass is used to protect the light guide plate; an illumination light source is arranged on the side of the light guide plate, and the illumination light source is used to generate light and couple the light into the light guide plate, and the light guide plate converts the light transmitted by total reflection inside the light guide plate into light output downward, thereby illuminating an object;

[0011] A light source blocking layer is provided on the protective glass, and the light source blocking layer is used to prevent light from entering the protective glass.

[0012] The utility model provides a light source blocking layer on the protective glass, which limits various external light energies including the light generated by the lighting light source from entering the protective glass, thereby preventing defects or dirt on the surface of the protective glass from interfering with the recognition and detection of surface defects of objects and affecting information collection. Even if the glass is contaminated to a certain extent during use, the interference pattern generated by the contaminants will greatly reduce the interference to the image acquisition system.

[0013] As the preferred technical solution:

[0014] The light source blocking layer is a light blocking layer, a light absorbing layer or a light reflecting layer.

[0015] As the preferred technical solution:

[0016] The protective glass is an optical flat plate.

[0017] As the preferred technical solution:

[0018] A light source blocking layer is provided on the side of the protective glass, and a light source blocking layer with a width of L is provided on the upper and lower surfaces of the protective glass, and the range of L is 0.01-100mm. The light source blocking layers on the upper and lower surfaces of the protective glass are located at the edge of the protective glass and connected to the light source blocking layers on the side of the protective glass.

[0019] Avoid light from entering the interior of the protective glass from the sides of the protective glass and the edge areas of the protective glass surface to form total reflection light.

[0020] As the preferred technical solution:

[0021] The range of L is 5-10mm.

[0022] As the preferred technical solution:

[0023] The light-blocking layer is an opaque non-metallic film or metal film electroplated on the outer surface of the protective glass.

[0024] As the preferred technical solution:

[0025] The light-blocking layer is aluminum foil, copper foil or an opaque film material wrapped around the outer surface of the protective glass.

[0026] As the preferred technical solution:

[0027] The light-absorbing layer is a light-absorbing dye coating coated on the outer surface of the protective glass, and the light-reflecting layer is a light-reflecting dye coating coated on the outer surface of the protective glass.

[0028] As the preferred technical solution:

[0029] The anti-fouling planar shadowless light illumination system further comprises a mechanical component, which is a multi-layer structure, wherein the illumination light source and the light-guiding plate are placed on the same layer, and the protective glass is placed on another layer isolated from the illumination light source.

[0030] As the preferred technical solution:

[0031] The lighting source adopts LED light source.

[0032] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0033] The utility model limits various external light energies including the illumination light source from entering the protective glass by arranging a light source barrier layer on the protective glass, and avoids light from entering the protective glass from the side surface of the protective glass and the edge area of ​​the protective glass surface to form total reflected light. After the light source barrier layer is arranged, even if the protective glass is polluted or has defects, since there is no total reflected light inside the protective glass, no bright spot or bright pattern will be formed in the presence of pollution or defects, thereby eliminating the influence of pollution or defects on the CCD image acquisition, avoiding the defects or dirt on the surface of the protective glass interfering with the recognition and detection of surface defects of the object, and greatly reducing the image interference of pollutants on the acquisition system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a layout diagram of the anti-fouling planar shadowless lighting system described in the utility model.

[0035] Figure 2 This is a schematic structural diagram of the protective glass described in the utility model.

[0036] Figure 3 for Figure 2 Side view of.

[0037] Figure 4This is a schematic structural diagram of the anti-fouling planar shadowless lighting system described in Example 2.

[0038] Figure 5 This is a schematic diagram of the structure in which the light guide plate and the protective glass are staggered.

[0039] Figure 6 This is a schematic structural diagram of the anti-fouling planar shadowless lighting system described in Example 4.

[0040] Icon: 1-CCD image acquisition system, 2-illumination light source, 3-protective glass, 4-light guide plate, 5-illuminated object, 6-light source barrier layer, 7-mechanical components, 8-light blocking structure. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] Example 1

[0043] like Figure 1 As shown, this embodiment proposes an anti-fouling planar shadowless lighting system, including a light guide plate 4 and a protective glass 3, wherein the protective glass 3 is an optical plate, and the light guide plate 4 is a flat rectangular structure. The protective glass 3 is arranged on the upper and lower sides of the light guide plate 4, and the protective glass 3 is used to protect the light guide plate 4 to prevent external dirt from contaminating or damaging the light guide plate 4. The lighting light source 2 is arranged on the four sides of the light guide plate 4, and the lighting light source 2 is used to generate light and couple the light into the light guide plate 4. The light guide plate 4 converts the light transmitted by total reflection inside it into light output downward, thereby illuminating the object, and the illuminated object 5 is placed below the protective glass 3 and the light guide plate 4. A CCD image acquisition system 1 is arranged above the protective glass 3 and the light guide plate 4 for acquiring images.

[0044] In order to prevent external light from entering the protective glass 3, the utility model proposes to block light, shade light or absorb light on the side of the protective glass 3 and the upper and lower surfaces of the protective glass 3 with a width L from the side, so that the light emitted by the lighting light source 2 and the external light cannot enter the protective glass 3.

[0045] The specific technical solutions are:

[0046] like Figure 1-Figure 3As shown, a light source blocking layer 6 is provided on the protective glass 3, and the light source blocking layer 6 is used to prevent light from entering the protective glass 3. Light source blocking layers 6 are provided on the four sides of the protective glass 3, and four light source blocking layers 6 with a width of L are provided on the upper surface and the lower surface of the protective glass 3, respectively. The range of L is 0.01-100mm, and preferably, the range of L is 5-10mm. The light source blocking layers 6 on the upper surface and the lower surface of the protective glass 3 are located at the edge of the protective glass 3, and are respectively connected to the light source blocking layers 6 on the corresponding sides of the protective glass 3. After the light source blocking layer 6 is provided, it is prevented that light enters the protective glass 3 from the side of the protective glass 3 and the edge area of ​​the surface of the protective glass 3 to form total reflected light. Therefore, when there is pollution or defects on the protective glass 3, no bright spot or bright pattern will be formed, which prevents the defects or dirt on the surface of the protective glass 3 from interfering with the recognition and detection of surface defects of the object.

[0047] The light source blocking layer 6 is a light blocking layer, a light absorbing layer or a light reflecting layer.

[0048] When the light source blocking layer 6 is a light blocking layer, the light blocking layer can be an opaque non-metallic film or metal film electroplated on the outer surface of the protective glass 3 , or can be an aluminum foil or copper foil wrapped on the outer surface of the protective glass 3 .

[0049] When the light source blocking layer 6 is a light absorbing layer, the light absorbing layer may be a light absorbing dye coating coated on the outer surface of the protective glass 3 .

[0050] When the light source blocking layer 6 is a reflective layer, the reflective layer may be a reflective dye coating coated on the outer surface of the protective glass 3 .

[0051] Of course, the protective glass 3 is not limited to being processed in the manner listed above, and any other measures that can prevent light from entering the protective glass 3 are also acceptable.

[0052] Example 2

[0053] The difference between this embodiment and embodiment 1 is that:

[0054] like Figure 4 As shown, the anti-fouling planar shadowless light illumination system also includes a mechanical component 7, which is a multi-layer structure. The layers are isolated by mechanical structures. The illumination light source 2 and the light guide plate 4 are placed on the same layer, and the protective glass 3 is placed on another layer isolated from the illumination light source 2 to ensure that the light energy emitted from the illumination light source 2 cannot enter the protective glass 3 through the side edge of the protective glass 3 and the upper and lower surfaces at a distance L from the side edge.

[0055] Example 3

[0056] The difference between this embodiment and embodiment 2 is that:

[0057] like Figure 5As shown, the anti-fouling planar shadowless light lighting system of this embodiment adopts a staggered type. The size of the light guide plate 4 is smaller than that of the protective glass 3. The lighting light source 2 is embedded in the staggered space between the two. The lighting light source 2 only illuminates the side of the light guide plate 4, avoiding the side and edge position of the protective glass 3. Based on the staggered layout of the light guide plate 4 and the protective glass 3, the effect of blocking light from entering the protective glass 3 is achieved.

[0058] Example 4

[0059] The difference between this embodiment and embodiment 2 is that:

[0060] like Figure 6 As shown, an “L”-shaped or “U”-shaped light blocking structure 8 is arranged between the protection glass 3 and the light guide plate 4 .

[0061] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An anti-fouling planar shadowless lighting system, characterized in that: The light guide plate comprises a light guide plate and a protective glass, wherein the protective glass is arranged on the upper side and / or the lower side of the light guide plate, and the protective glass is used to protect the light guide plate; an illumination light source is arranged on the side of the light guide plate, and the illumination light source is used to generate light and couple the light into the light guide plate; the light guide plate converts the light transmitted by total reflection inside the light guide plate into light output downward, so as to illuminate the object; A light source blocking layer is provided on the protective glass, and the light source blocking layer is used to prevent light from entering the protective glass.

2. The anti-fouling planar shadowless lighting system according to claim 1, characterized in that: The light source blocking layer is a light blocking layer, a light absorbing layer or a light reflecting layer.

3. The anti-fouling planar shadowless lighting system according to claim 1, characterized in that: The protective glass is an optical flat plate.

4. The anti-fouling planar shadowless lighting system according to claim 1, characterized in that: A light source blocking layer is provided on the side of the protective glass, and a light source blocking layer with a width of L is provided on the upper and lower surfaces of the protective glass, and the range of L is 0.01-100mm. The light source blocking layers on the upper and lower surfaces of the protective glass are located at the edge of the protective glass and connected to the light source blocking layers on the side of the protective glass.

5. The anti-fouling planar shadowless lighting system according to claim 4, characterized in that: The range of L is 5-10mm.

6. The anti-fouling planar shadowless lighting system according to claim 2, characterized in that: The light-blocking layer is an opaque non-metallic film or metal film electroplated on the outer surface of the protective glass.

7. The anti-fouling planar shadowless lighting system according to claim 2, characterized in that: The light-blocking layer is aluminum foil, copper foil or an opaque film material wrapped around the outer surface of the protective glass.

8. The anti-fouling planar shadowless lighting system according to claim 2, characterized in that: The light-absorbing layer is a light-absorbing dye coating coated on the outer surface of the protective glass, and the light-reflecting layer is a light-reflecting dye coating coated on the outer surface of the protective glass.

9. The anti-fouling planar shadowless lighting system according to claim 1, characterized in that: It also includes a mechanical component, which is a multi-layer structure. The lighting source and the light-guiding plate are placed on the same layer, and the protective glass is placed on another layer isolated from the lighting source.

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