CN219302715U - High-definition planar light guide device - Google Patents
High-definition planar light guide device Download PDFInfo
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- CN219302715U CN219302715U CN202320314995.3U CN202320314995U CN219302715U CN 219302715 U CN219302715 U CN 219302715U CN 202320314995 U CN202320314995 U CN 202320314995U CN 219302715 U CN219302715 U CN 219302715U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model relates to the technical field of light guide illumination equipment, and aims to solve the problems of low precision, severely limited stripe contrast and easy detection false alarm of the existing light guide illumination products; the upper surface of the light guide plate is provided with a plurality of banded light scattering microstructure areas at intervals, the light scattering microstructure areas are provided with a plurality of light scattering microstructures, and the transverse dimension of the light scattering microstructures is 2-500 mu m. According to the utility model, the light guide plate is provided with the light scattering microstructure area, and the light scattering microstructure area is internally provided with a plurality of light scattering microstructures, and as the light scattering microstructure area is very small in size, the light enters the light guide plate and then irradiates on each light scattering microstructure to be reflected, the light is output to the light guide plate to irradiate on the surface of an object to be detected, the formed bright stripe light source is very high in precision, and the deformation precision of the bright stripe light source is very high, so that the real condition of the surface of the object to be detected can be accurately reflected.
Description
Technical Field
The utility model relates to the technical field of light guide illumination equipment, in particular to a high-definition plane light guide device.
Background
In the application of image capturing in the field of machine vision, due to the problems of limited installation positions of devices and detection of surface defects of special objects, there is an urgent need for a device capable of capturing planar products, such as: optical illumination for detecting defects such as glass plane and film surface with high precision, and detection products.
In order to solve the above problems, in the prior art, a method of screen printing light reflection stripes on a glass surface and covering black shading ink on the surface of the light reflection stripes is commonly used to produce a light guide illumination product based on the ink.
The detection principle is as follows: light enters the light guide illumination product from the side face and is transmitted in a total reflection way in the light guide illumination product; when the light irradiates the light reflection stripe area, the light transmission direction is changed, and the light is coupled to output the light guide illumination product; when the light irradiates the plane area without the light reflection stripes, the light waves continue to transmit forward; the light reflection stripes are thus seen from the outside as a strip of bright light source, the other areas being no light areas.
After the strip-shaped light source irradiates the surface of the planar object, if the planar object is not deformed, the image of the strip-shaped light source reflected from the planar object is still a set strip, and the strip-shaped light source cannot be distorted; however, if the surface of the planar object is slightly deformed, the image of the stripe light source reflected from the planar object will be severely distorted in the deformed area; the deformation degree of the film can be inverted according to the stripe distortion state.
The prior art has the design defects that:
screen printing accuracy is poor because the degree of deformation of the object to be measured is inverted according to the stripe deformation. The precision of screen printing (about 300 um) is far less than the processing precision of the microstructure (0.5 um), and the precision of the measured object is severely limited.
Compared with metal film layers (such as silver, aluminum and the like), the reflectivity of the screen-printed silver paste is extremely low, so that the brightness of a light guide illumination product is greatly limited, and the contrast of stripes is severely limited;
the edges of the silver paste lines of screen printing are uneven, some areas are wide, some areas are narrow, the difference is extremely large (the difference can reach 100 um), detection false alarm is easily caused, and the qualified surface is misdetected as the unqualified surface.
Disclosure of Invention
The utility model aims to provide a high-definition planar light guide device to solve the problems of low precision, severely limited fringe contrast and easy detection false alarm existing in the existing light guide illuminating products.
The utility model is realized by adopting the following technical scheme:
the utility model provides a high-definition plane light guide device, which comprises a light guide plate, wherein the light guide plate comprises an upper surface and a lower surface which are parallel to each other; the upper surface of the light guide plate is provided with a plurality of banded light scattering microstructure areas at intervals, the light scattering microstructure areas are provided with a plurality of light scattering microstructures, and the transverse dimension of each light scattering microstructure is 2-500 mu m.
As a preferable technical scheme:
the light scattering microstructures are arranged in a triangular arrangement, a quadrilateral arrangement, a hexagonal arrangement or a random irregular arrangement;
the astigmatic microstructures are closely arranged or sparsely arranged at intervals.
As a preferable technical scheme:
the preferred arrangement mode among the light scattering microstructures is quadrilateral close arrangement and hexagonal close arrangement.
As a preferable technical scheme:
the light scattering microstructure areas are linear strip-shaped areas, all the linear strip-shaped areas are parallel to each other and are arranged at equal intervals, the transverse width of each light scattering microstructure area is 50-5000 microns, and the center distance between every two adjacent light scattering microstructure areas is 100-10000 microns.
As a preferable technical scheme:
the surface of the light scattering microstructure area is covered with a light reflection film layer.
As a preferable technical scheme:
the light reflection film layer completely covers the light scattering microstructure area, and the area of the light reflection film layer is larger than or equal to the area of the light scattering microstructure area.
As a preferable technical scheme:
the light reflection film layer can reflect light towards one surface of the light guide plate, and one surface of the light reflection film layer towards the outside can absorb ambient light irradiated to the surface of the light reflection film layer from the outside.
As a preferable technical scheme:
the light guide plate is of a flat cuboid structure, the upper surface, the lower surface and the four side surfaces of the light guide plate are all provided with optical-grade transparency, and the four side surfaces of the light guide plate are perpendicular to the upper surface and the lower surface of the light guide plate.
As a preferable technical scheme:
the light guide plate is a glass structural member or a transparent plastic structural member.
As a preferable technical scheme:
the astigmatic microstructure is either a concave microstructure or a convex microstructure.
As a preferable technical scheme:
the light scattering microstructure is a rotating curved surface structure with a V-shaped section, an inverted trapezoid section, a minor arc section or a parabola section, or a cylinder structure with a V-shaped section, an inverted trapezoid section, a minor arc section or a parabola section.
As a preferable technical scheme:
the lower surface of the light guide plate is plated with an optical antireflection film.
In summary, due to the adoption of the technical scheme, the beneficial effects of the utility model are as follows:
1. the utility model provides a strip-shaped light scattering microstructure area arranged on a light guide plate, wherein a plurality of light scattering microstructures are arranged on the light scattering microstructure area, and the transverse size of a single light scattering microstructure is between 2 and 500 mu m because the size of the light scattering microstructure is very small, so that after light enters the light guide plate, the light irradiates the plurality of light scattering microstructures in the light scattering microstructure area and is reflected, the light is irradiated to the surface of an object to be detected by an output light guide plate, the formed bright streak light source has very high precision, and the deformation precision of the bright streak light source is very high, so that the real situation of the surface of the object to be detected can be reflected more accurately.
2. The edge precision of the astigmatic microstructure area is also high, unlike the situation that edges of silver paste lines printed by silk screens are uneven, and the situation of false detection is avoided.
3. The light reflection film layer additionally arranged in the utility model further enhances the reflection of light in the light scattering microstructure area, improves the reflectivity, enhances the brightness of the stripe light source and enhances the stripe contrast.
4. The optical antireflection film is convenient for outputting light to the light guide plate.
Drawings
Fig. 1 is a schematic structural diagram of a high definition planar light guide device according to the present utility model.
FIG. 2 is a schematic structural diagram of an astigmatic microstructure area according to the present utility model.
FIG. 3 is a schematic structural diagram of hexagonal closely packed light diffusing microstructure.
Fig. 4 is a schematic structural diagram of a quadrangular closely-arranged astigmatic microstructure.
FIG. 5 is a schematic structural diagram of hexagonal spaced astigmatic microstructures.
FIG. 6 is a schematic structural diagram of a random arrangement of astigmatic microstructures.
Fig. 7 is a schematic structural diagram of an astigmatic microstructure with a concave minor arc in cross section.
Fig. 8 is a schematic structural diagram of an astigmatic microstructure with a convex minor arc in cross section.
FIG. 9 is a schematic structural diagram of an astigmatic microstructure with a V-shaped cross section.
Fig. 10 is a schematic diagram of the operation of the high definition planar light guide device of the present utility model.
Icon: 1-light guide plate, 2-light scattering microstructure area, 21-light scattering microstructure, 3-light reflection film layer, 4-object to be detected and 5-light source.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
As shown in fig. 1, this embodiment provides a high-definition planar light guide device, which includes a light guide plate 1, the light guide plate 1 is in a flat cuboid structure, the upper surface, the lower surface and four sides of the light guide plate 1 all have optical-level transparency, the upper surface and the lower surface of the light guide plate 1 are parallel to each other, and the four sides of the light guide plate 1 are perpendicular to the upper surface and the lower surface of the light guide plate 1. In this embodiment, the light guide plate 1 is a glass structural member or a transparent plastic structural member.
The upper surface of the light guide plate 1 is provided with a plurality of banded light scattering microstructure areas 2 at intervals, the area of each banded light scattering microstructure area 2 accounts for 10% -90% of the upper surface area of the light guide plate 1, the preferable ratio is 50%, and the banded light scattering microstructure areas 2 are uniformly distributed at intervals on the upper surface of the light guide plate 1. The transverse width of each light scattering microstructure area 2 is 50-5000 μm, and the center distance between two adjacent light scattering microstructure areas is 100-10000 μm.
As shown in fig. 2, the light-diffusing microstructure area 2 is provided with a plurality of light-diffusing microstructures 21, and the lateral dimension of each light-diffusing microstructure 21 is 2 μm to 500 μm. All the light-diffusing microstructures 21 are regularly arranged or irregularly arranged in the light-diffusing microstructure area 2, and the regular arrangement is shown in fig. 3 to 5, and the irregular arrangement is shown in fig. 6. The astigmatic microstructure 21 may be a concave microstructure or a convex microstructure. As shown in fig. 7 to 9, the light diffusing microstructure 21 may be a rotating curved surface structure having a V-shaped, inverted trapezoidal, minor arc, or parabolic cross section, or a cylinder structure having a V-shaped, inverted trapezoidal, minor arc, or parabolic cross section. The size and shape of the astigmatic microstructure 21 at different locations may be uniform or may be different. As shown in fig. 3 and 5, the individual astigmatic microstructures 21 in each astigmatic microstructure area 2 may be closely connected, or may be spaced apart and arranged in a sparse manner.
As shown in fig. 2, preferably, the surface of the light-diffusing microstructure area 2 is covered with a light-reflecting film layer 3, the light-reflecting film layer 3 completely covers the light-diffusing microstructure area 2, and the area of the light-reflecting film layer 3 is greater than or equal to the area of the light-diffusing microstructure area 2. The light reflection film layer 3 has a high-efficiency light reflection effect towards one surface of the light guide plate 1, and the light reflection film layer 3 has a high-efficiency light absorption effect towards one surface of the outside air.
The working principle of the high-definition planar light guide device is as follows:
as shown in fig. 10, a light source 5 is disposed at one side of the light guide plate 1, light enters the light guide plate 1 from the side, and is transmitted in the light guide plate 1, an object 4 to be detected is disposed below the light guide plate 1, when light irradiates the light scattering microstructure area 2, the transmission direction of the light is changed, and the light is coupled out of the light guide plate 1 and irradiates the surface of the object 4 to be detected; when the light irradiates the non-astigmatic microstructure area, the light wave continues to transmit forward total reflection; the light scattering microstructure area on the upper surface of the light guide plate 1 is reflected by the object 4 to be detected, so that a bright stripe is formed; the light rays of the non-astigmatic microstructure area on the upper surface of the light guide plate 1 are totally reflected on the light guide plate 1, a strip of dark stripes is formed on the surface of the object 4 to be detected, and the bright stripe areas and the dark stripe areas are staggered; if the surface of the object 4 to be detected is a plane, the bright stripes and the dark stripes will not be distorted, and if the surface of the object 4 to be detected has defects, the bright stripes and the dark stripes will be distorted and deformed.
Since the size of the light scattering microstructure 21 is very small, the transverse size of the single light scattering microstructure 21 is between 2 μm and 500 μm, so that after light enters the light guide plate 1, the light irradiates onto a plurality of light scattering microstructures 21 in the light scattering microstructure area 2 and is reflected, the light is irradiated onto the surface of the object 4 to be detected by the output light guide plate 1, the formed bright stripe has very high precision, the deformation precision of the bright stripe light source is very high, and the real situation of the surface of the object 4 to be detected can be reflected more accurately. And the edge precision of the astigmatic microstructure area 2 is also very high, unlike the uneven edges of silver paste lines of screen printing, the situation of false detection is avoided.
Meanwhile, the light reflection film layer 3 is additionally arranged, so that the reflection of light in the light scattering microstructure area 2 is further enhanced, the reflectivity is improved, the brightness of the stripe light source is enhanced, and the stripe contrast is enhanced.
Example 2
This embodiment differs from embodiment 1 in that:
the lower surface of the light guide plate 1 is also plated with an optical antireflection film for enhancing the effect of the light output light guide plate 1.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. A high definition planar light guide device, characterized by:
the light guide plate comprises an upper surface and a lower surface which are parallel to each other; the upper surface of the light guide plate is provided with a plurality of banded light scattering microstructure areas at intervals, the light scattering microstructure areas are provided with a plurality of light scattering microstructures, and the transverse dimension of each light scattering microstructure is 2-500 mu m.
2. The high definition planar light guide device according to claim 1, wherein:
the light scattering microstructures are arranged in a triangular arrangement, a quadrilateral arrangement, a hexagonal arrangement or a random arrangement;
the astigmatic microstructures are closely arranged or sparsely arranged at intervals.
3. The high definition planar light guide device according to claim 1, wherein:
the light scattering microstructure areas are linear strip-shaped areas, all the linear strip-shaped areas are parallel to each other and are arranged at equal intervals, the transverse width of each light scattering microstructure area is 50-5000 microns, and the center distance between every two adjacent light scattering microstructure areas is 100-10000 microns.
4. The high definition planar light guide device according to claim 1, wherein:
the surface of the light scattering microstructure area is covered with a light reflection film layer.
5. The high definition planar light guide device according to claim 4, wherein:
the light reflection film layer completely covers the light scattering microstructure area, and the area of the light reflection film layer is larger than or equal to the area of the light scattering microstructure area.
6. The high definition planar light guide device according to claim 4, wherein:
the light reflection film layer can reflect light towards one surface of the light guide plate, and one surface of the light reflection film layer towards the outside can absorb ambient light irradiated to the surface of the light reflection film layer from the outside.
7. The high definition planar light guide device according to claim 1, wherein:
the light guide plate is of a flat cuboid structure, the upper surface, the lower surface and the four side surfaces of the light guide plate are all provided with optical-grade transparency, and the four side surfaces of the light guide plate are perpendicular to the upper surface and the lower surface of the light guide plate.
8. The high definition planar light guide device according to claim 1, wherein:
the astigmatic microstructure is either a concave microstructure or a convex microstructure.
9. A high definition planar light guide device according to any one of claims 1 to 8, wherein:
the light scattering microstructure is a rotating curved surface structure with a V-shaped section, an inverted trapezoid section, a minor arc section or a parabola section, or a cylinder structure with a V-shaped section, an inverted trapezoid section, a minor arc section or a parabola section.
10. A high definition planar light guide device according to any one of claims 1 to 8, wherein:
the lower surface of the light guide plate is plated with an optical antireflection film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320314995.3U CN219302715U (en) | 2023-02-24 | 2023-02-24 | High-definition planar light guide device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320314995.3U CN219302715U (en) | 2023-02-24 | 2023-02-24 | High-definition planar light guide device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219302715U true CN219302715U (en) | 2023-07-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320314995.3U Active CN219302715U (en) | 2023-02-24 | 2023-02-24 | High-definition planar light guide device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219302715U (en) |
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2023
- 2023-02-24 CN CN202320314995.3U patent/CN219302715U/en active Active
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