JP2014023935A - Surgery lighting device having a lower glass plate for reducing reflections - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surgery lighting device having a lower glass plate and constituted to reduce the reflection of a light to impinge upon the lower glass plate from the outside, and the brightness and contrast of an image reflected.SOLUTION: A surgery lighting device 1 having a lighting housing 8 arranged therein with at least one light source 10. The lighting housing 8 has a light emitting surface. The light emitting surface has a transparent lower glass plate 9. A transparent hard coating material is applied to at least one surface of the lower glass plate 9 so that the coating material changes and/or reduces the reflection characteristics of the lower glass plate, and the surface of the hard coating material has a flat milli-structure which has an included transition region and which is distributed unevenly and at random.

Description

  The invention relates to surgical illumination having the features of claim 1 and to a lower glass plate having the features of claim 12. In particular, the present invention relates to surgical illumination with a lower glass plate configured to reduce reflection at the lower glass plate.

  The surgical illumination according to the invention is usually preferably movably mounted on a pivotable ceiling arm system and has one or more light sources provided in the illumination housing, the rays of this surgical illumination being For example, it is redirected in the direction of the light exit surface by one or more reflectors and / or lenses. The light exit surface is provided with a lower glass plate, which causes one or more light sources, reflectors and / or lenses (commonly referred to as optical systems) to become dirty or dejustiert. Or being damaged. The lower glass plate is preferably made of glass or plastic and is transparent so that light from one or more light sources can pass through the plate and illuminate the surgical site. Since this surgical illumination is relatively large and thus has a large light exit opening, this lower glass plate is also relatively large. In the case of conventional surgical lighting, this lower glass plate produces undesirable reflections. In order to prevent or reduce this reflection, this lower glass plate is provided with a special coating according to the invention.

  Due to the difference in refractive index between the ambient air and the lower glass plate, about 4% of the incident light at each surface (ie, inside and outside the lower glass plate) at standard incidence (ie perpendicular to the surface of the plate). Fresnel reflection occurs. This effect can be even more pronounced at larger angles. The calculation of reflection and transmission is performed by Fresnel's formula as is well known.

  For light emitted from the light source and reflected back by the lower glass plates (outside and inside) back into the illumination housing, this results in a loss of about 8% in terms of efficiency. This loss is, of course, taken into account in the illumination structure and the choice of one or more light sources and can therefore be admitted.

  Of course, the reflection of light from the surrounding area of the OP outside the illumination at this lower glass plate, that is, the reflection of light incident on the lower glass plate from the outside at a certain angle and reflected there, is a drawback. Becomes clear. This lower glass plate acts like a mirror in this reflection. Light incident on the lower glass plate in the vertical direction and thus reflecting about 8% is not an essential problem because the reflection outside the lower glass plate is hardly noticeable and is emitted through the glass plate. Because the light is much brighter than that, the reflections on the outside can hardly be perceived.

  For a relatively large angle (for example, for a relatively small angle greater than 20 ° with respect to the normal but where the transmitted light of the surgical illumination is no longer emitted, or when the surgical illumination is turned off) Visibility and reflection contrast, however, reach a critical degree. In particular, the visibility of extremely bright objects, such as the visibility of objects illuminated by the surgical illumination itself or other surgical illumination light, is perceived by the observer's eyes, so that the reflection of 8% on this plate Is sufficient immediately. This allows a patient who is laid down on the operating table and whose surgical site is illuminated by the light of the surgical lights to “actually” watch his or her surgery, because the outside of the lower glass plate This is because it works like a mirror. In particular, this effect is a disadvantage when the patient is operated on with partial anesthesia, for example in the case of a caesarean section.

  Accordingly, the problem underlying the present invention is to provide surgical illumination with a lower glass plate that overcomes the disadvantages described above. A particular object of the present invention is to provide a surgical illumination with a lower glass plate that is configured to reduce the reflection of light impinging on the lower glass plate from the outside and thereby the brightness and contrast of the reflected image. That is. For this purpose, this lower glass plate preferably reduces the recognition of objects reflected by the lower glass plate, while at the same time essentially maintaining the transmission properties of the lower glass plate, thereby converging the light focused on the OP site. Must still be configured to be fully served. Another object of the present invention is to provide a lower glass plate having the above-mentioned characteristics for use in surgical lighting. Other challenges will be apparent to those skilled in the art from the entirety of this disclosure.

  In general, it is known that a glass plate (for example, glasses glass) is provided with antireflection. However, this solution has proved disadvantageous for the lower glass plate of surgical lighting, since such antireflection only works for a selected angular range, but the lower glass plate is provided. This is because the surgical lighting being used is used at essentially any angle. A further disadvantage of the known antireflection is that the antireflection film appears even more intense at a given light incident angle.

  Furthermore, it is known to provide a matte glass plate. Of course, such matting has been found to be disadvantageous for the lower glass plate, since the light of the surgical illumination must pass through the lower glass plate and be focused on the surgical site, This is because a preset light distribution has to be achieved. Furthermore, in the case of surgical lighting, it must be avoided that scattered light, which is of course inevitable in the case of matting of the lower glass plate, is generated.

  Finally, it is conceivable to reduce the area of the lower glass plate. This is not an effective solution because the design of this lighting must be changed essentially. Similarly, it is not meaningful to divide the lower glass plate into a plurality of individual parts because in this case, a troublesome frame structure is required. Furthermore, such a solution can cause unwanted shadows.

  The above mentioned and other problems are solved by the surgical lighting having the features of claim 1 and by the lower glass for use in surgical lighting having the features of claim 12. In the respective dependent claims, preferred and advantageous embodiments of the surgical illumination according to the invention or the lower glass plate according to the invention are described.

  The surgical illumination according to the invention preferably has a housing that is adapted to be movably attached to the holding system, in particular to the swivel arm system. One or more light sources and the associated optical system are arranged in the illumination housing. The light source and the optical system are configured such that light is redirected in the direction of the light exit opening of the illumination. This optical system includes a reflector and / or a lens system. Normally, this surgical illumination is positioned by the swivel arm system so that light illuminates the operating table downwards, so that the light emitted from this surgical illumination is generally illuminated in the vertical direction. The lighting housing has a housing upper part and a housing lower part, where the concepts of “upper” and “lower” relate to the above-mentioned positioning of the lighting. The light exit opening is provided at the lower part of the housing, and is preferably formed of a transparent plate made of glass or plastic (referred to as “lower glass plate” in the present specification).

  The housing has a handgrip having a size suitable for the physician or surgeon to grab comfortably by hand or at least with fingers and pivoting the surgical illumination to a desired position, possibly with a pivoting arm system A grip component is provided.

  In addition, the housing and / or grip component is provided with a plurality of operating elements that can be used to adjust the brightness, focus the light source or adjust other functions.

  The light source can be a conventional incandescent lamp, a line-type lamp (Linienlampen), a halogen incandescent lamp or a light emitting diode. The use of light emitting diodes (LEDs) is currently preferred because they are extremely energy efficient and have only a little heat radiation. In the case of a possible embodiment of the present invention, the plurality of LEDs are combined into one LED module, and in the case of surgical lighting according to the present invention, preferably a plurality of, for example, vertical (striped) LEDs as the light source Has a module. The brightness of this surgical illumination is variable by turning on or off the corresponding number of LED modules. Furthermore, it is possible to turn on or off individual LEDs of the LED module.

  As described above, the surgical illumination housing preferably has an upper housing portion and a lower housing portion, and the lower housing portion includes a light output opening. However, the lighting housing may be formed in the shape of an upside-down bowl with a single base, the lower side being closed by a glass plate or a plexiglass plate (lower glass plate). The lower glass plate is bonded to the substrate by a suitable sealant. This lower glass plate is preferably bonded to the substrate by clamp bonding or stress bonding. This clamping connection further improves the action of the sealant between the lower glass plate and the substrate, since this lower glass plate is strongly pressed against the sealing ring at the outer peripheral opening of the substrate by its peripheral edge. Because.

  The swivel arm system is pivotally connected to the base via one or two support arms. Preferably, the current supply for the surgical illumination is through the swivel arm system and the wire extends through the support arm and swivel joint to the interior of the substrate. In this way, it is achieved that the housing has a flat surface with a few joints between the individual housing members and can therefore be easily cleaned.

  The reduction of the visibility, brightness and contrast of the reflected image of the lower glass plate according to the present invention is achieved by applying a transparent hard paint to the lower glass plate, thereby changing the reflection characteristics of the lower glass plate. . In particular, undesirable reflections due to the hard paint layer can be essentially suppressed or at least reduced. The surface of the lower glass plate produced by the application of hard paint is not flat in large area but has an irregular and randomly distributed flat millimeter structure with intervening transition regions. The light striking this structure is partly transmitted and reflected unaffected, and partly scatters in the millimeter-plane transition region with a slight angle. Thereby, the image is no longer reflected in the large area by the lower glass plate but is divided into small areas. This transition region between the millimeter structures further distorts the image, resulting in a no-recognizable image consisting of a large number of small “puzzle parts” (such as in the case of broken glass) from a homogeneous whole image. Most of this plate is still flat (with a small area), so that the surgical illumination light can be transmitted through the lower glass plate with little obstruction. Only light hitting the transition region is diverted (at a slight angle) from its original path. Since this area is only a small percentage in terms of area, only a small amount of light is scattered. Even the light passing through the transition region is only slightly redirected, since this angle of incidence is relatively small (Snell's law of refraction). The light distribution at the OP work site changes only slightly.

  In fact, the perception of surgical site reflections by the patient's eyes can be completely hindered, and the light characteristics of the surgical lighting are only slightly and appreciably changed. Deterioration of the light distribution (d50 / d10 ratio) less than 10% is acceptable in most cases, and about 10% reduction in central brightness is compensated by correspondingly increasing the output of the light source. Can do.

  In the preferred embodiment, the polycarbonate plate (lower glass plate) is preferably wetted with a paint that cures with UV light. This wetting is preferably performed by a printing method using a plotter. The “almost random” distribution of paint is caused by the local distribution of paint application and the amount of paint applied. Before the paint bleeds and is completely distributed and becomes a uniform smooth paint surface based on its surface tension, the paint is excited with UV radiation for curing.

  Typical paint mixtures are for example urethane-acrylate-oligomers (about 21-25% by weight), epoxy-acrylate-oligomers (about 5-7% by weight), reactive monomers (about 40-44% by weight), reaction initiation An agent (about 2 to 4% by mass), a viscosity modifier (about 24 to 28% by mass) and an additive (about 0.3 to 0.5% by mass).

  The surface that can be created in this way has a surface structure distributed almost randomly, and this surface structure changes the reflection properties of the lower glass plate. The height of this structure is about 0.01 to 0.1 mm. The average diameter of the individual areas is about 0.1 to 1.0 mm. The ratio of the parallel plane of the new surface is about 85-95%, and the remainder consists of the transition region (recess).

  The lower glass plate made by the above method is incorporated into the surgical lighting with this structured surface facing outward. Thereby, the recognizability of the reflection on the lower glass plate of the surgical lighting is almost completely hindered. At the same time, the optical parameters of the surgical illumination are only slightly changed. Based on the modified surface of the lower glass plate, the maximum illuminance of the surgical illumination is reduced from about 160 kLux to about 135 kLux at a working distance of 1 meter. This decrease in illuminance can be completely compensated for by improving the luminous flux. Similarly, the light distribution at the work site (surgical site) changes only slightly. Due to refraction in the transition region, this light is no longer concentrated strongly in the center of the working site, but rather somewhat scattered in the peripheral region. Thereby, unless it is structurally compensated, the diameter ratio d50 / d10 (the diameter of the light region having 50% / 10% of the maximum illuminance) is reduced, for example, from about 0.62 to 0.58. This value is acceptable if this value is well above the limit of 0.5. All other surgical lighting features required for the standard will change little as well.

  In other embodiments, the paint is constructed to have a higher hardness compared to the support material used (especially in the case of plastics such as polycarbonate). Thus, scratch protection is achieved at the same time that the paint layer is applied to the lower glass plate to reduce reflection. The high hardness of this paint can be achieved by the paint material used and / or by (crystalline) additives (eg nanoparticles).

  The invention will now be described by way of example with reference to the drawings, in which exemplary embodiments of surgical lighting according to the invention are described. However, the present invention is not limited to this embodiment.

Fig. 4 illustrates exemplary surgical lighting attached to a ceiling arm system. Fig. 3 shows an operating table in which the patient is laid down and the surgical site of the patient is illuminated by surgical lighting. The principle explanatory drawing of the reflection by the lower glass plate without a coating by this invention is shown. The principle explanatory drawing of the reflection in the lower glass plate provided with the coating by this invention is shown.

  FIG. 1 shows a surgical light 1 secured to a ceiling 3 of a medical procedure room via a ceiling arm system 2. (Note that different alternatives of ceiling arm system or other fixed system may be used.) The illustrated ceiling arm system 2 is individually connected to each other via a swivel joint 5. Support arm 4. The surgical illumination 1 has an illumination housing 8 that is pivotally attached to a support arm 6 via a pivot joint 7. The illumination housing includes a light exit opening 9 on the lower side, and the light exit opening 9 is covered with a plate or plate made of a transparent material (glass, plexiglass, etc.). This transparent plate (lower glass plate) is preferably flat (flat) or may be slightly warped. In the middle of the lighting housing 8, there is at least one light source 10 (only one is shown in FIG. 1). The at least one light source 10 emits a light beam that is reflected by the associated hollow reflector 11 (or a suitable optical system) in the direction of the light exit aperture. The illustrated example light source has an LED or LED module (with or without a lens element). Instead of the illustrated hollow reflector, a suitable lens adapted to the light source used can also be used. The light beam 12 emitted from the light source or light sources passes through the transparent lower glass plate 9 and is emitted in the direction of the operating table (shown in FIG. 2). In FIG. 1, this ray is shown as parallel radiation. However, as shown in FIG. 2, it is clear that this ray can be focused by the optical system. In the case of a possible embodiment, this transparent lower glass plate 9 is provided with a hole in the approximate center through which the axis of the grip component 13 with the handgrip extends. This hand grip is used in particular for the surgeon or surgeon to grasp by hand, so that the doctor can turn the surgical light 1 so that the light beam 12 strikes the desired surgical area. However, this grip component may be provided somewhere in the housing of the surgical lighting, for example.

  FIG. 2 shows the operating table 14 on which the patient 15 (shown schematically) is sleeping, in which case surgery is performed on the surgical site (position) 16. This surgical illumination 1 has the structure described with respect to FIG. Light is emitted from the light source and reflected by the hollow reflector so that the light is slightly collected and redirected to the surgical site (surgical region). A part of this light is reflected back to the inner side of the illumination housing at the inner surface of the lower glass plate 9, and this can be easily compensated by increasing the current supplied to the light source. Since the surgical site 16 is irradiated with light of surgical illumination, the region of the surgical site is illuminated brightly. Reference numeral 17 indicates an exemplary ray that is reflected by the lower glass plate 9 emanating and reflecting from the illuminated surgical site 16 so that the reflected ray 18 is redirected toward the patient's eye. Has been. In this way, the conventional lower glass plate 9 acts like a mirror so that the patient (especially when the patient is operated with partial anesthesia) can watch the operation “actually” and this can be avoided if possible. It is preferable. For this reason, in order to prevent or at least reduce this undesired reflection, the coating layer is preferably provided on the outside of the lower glass plate 9.

  FIG. 3 is a diagram illustrating the principle of reflection on the lower glass plate without coating according to the present invention. As can be seen in this figure, the light beam 12 ′ is emitted from a light source (not shown) and strikes the lower glass plate 9. A small percentage of this light is reflected by the lower glass plate. This reflected portion of light is denoted by reference numeral 12 ″. The portion of light 12 ′ that is transmitted through the lower glass plate 9 is denoted by reference numeral 12. This ray 12 illuminates the surgical site 16. Therefore, it hits this surgical site 16. A part of the light hitting the surgical site 16 is emitted from the surgical site 16 as a light beam 17, and this light also hits the lower glass plate 9, and a part of the light from the lower glass plate 9 is a light beam 18. This ray 18 produces an image of the surgical site (represented by reference numeral 16 ') that can be viewed by the patient (represented by the patient's eyes 20). This is because the conventional lower glass plate 9 acts like a mirror.

  FIG. 4 shows an illustration of the principle of reflection on a lower glass plate (similar to FIG. 3) with a coating according to the invention. As can be seen in this figure, the light beam 12 ′ is emitted from a light source (not shown) and strikes the inside of the lower glass plate 9. A small percentage of this light is again reflected by the lower glass. This reflected portion of light is denoted by 12 ". The portion of light 12 'that passes through the lower glass plate 9 is denoted by 12 and is slightly scattered when exiting from the outside of the lower glass plate. Most of the light beam 12 strikes the surgical site 16 to illuminate the surgical site 16. A portion of the light that strikes the surgical site 16 is emitted from the surgical site 16 as a light beam 17, which is also reflected in the lower glass. It strikes the outside with the paint coating of the plate 9 and scatters significantly and irregularly from this outside on the basis of the paint coating, this scattered light 18 being opposite to the embodiment of FIG. Instead, the patient sees only an irregular scattered light pattern (denoted by reference numeral 21), contrary to the embodiment of Fig. 3, the lower glass plate 9 of the embodiment according to the invention is flat. It ’s a mirror It does not act on, whereby the patient can not see the image of the surgical site.

[Aspect of the Invention]
1. Surgical illumination (1) comprising an illumination housing (8), wherein at least one light source (10) is arranged in the illumination housing (8), the illumination housing having a light exit surface, the light A transparent lower glass plate (9) is provided on the emission surface, and a transparent hard paint is applied to at least one surface of the lower glass plate (9), and the lower glass plate ( 9. The surgical illumination (1), wherein the reflective properties of 9) are altered and / or reduced, and the hard paint surface has a non-uniform and randomly distributed flat millistructure with intervening transition regions.

  2. The surgical illumination (1) according to the above 1, wherein the hard paint is a paint curable by UV light.

  3. 3. The lower glass plate (9) is made of glass or plastic, and light of at least one light source (10) passes through the lower glass plate (9) and illuminates a surgical site (16) according to 1 or 2 above Surgical lighting (1).

  4). The surgical lighting (1) according to any one of 1 to 3, wherein the lower glass plate (9) is made of polycarbonate.

  5. The surgical lighting (1) according to any one of 1 to 4, wherein the hard paint is applied to the lower glass plate by a printing method using a plotter.

  6). The hard paint is applied to the lower glass plate (9) by a wet method, and at this time, an almost random distribution of the paint is created by local distribution of paint and the amount of paint applied. Surgical illumination (1) according to claim 1.

  7). Any of 1 to 6 above, wherein the hard paint is excited with UV radiation for curing before the hard paint bleeds and is completely distributed and becomes a uniform smooth paint surface based on its surface tension. Surgical illumination (1) according to claim 1.

  8). The paint mixture is urethane-acrylate-oligomer 21-25% by mass, epoxy-acrylate-oligomer 5-7% by mass, reactive monomer 40-44% by mass, reaction initiator 2-4% by mass, viscosity modifier 24- The surgical illumination (1) according to any one of 1 to 7, comprising 28% by mass and an additive of 0.3 to 0.5% by mass.

  9. The surgical illumination according to any one of 1 to 8, wherein the height of the flat millimeter structure is 0.01 to 0.1 mm, and an average diameter of each surface is 0.1 to 1.0 mm. (1).

  10. The surgical illumination (1) according to any one of 1 to 9, wherein the surgical illumination is attached to a pivotable ceiling arm system (2).

  11. Surgical illumination (1) according to any one of the preceding 1 to 10, wherein at least one reflector (11) and / or at least one lens is provided in the surgical illumination housing (8).

  12 In the lower glass plate (9) for use in the surgical lighting (1), a transparent hard paint is applied to at least one surface of the lower glass plate (9), and the lower glass plate ( The lower glass plate (9), wherein the reflective properties of 9) are changed and / or reduced, and the surface of the hard paint has a non-uniform and randomly distributed flat millimeter structure with intervening transition regions.

  13. The lower glass plate (9) according to the item 12, wherein the hard paint is a paint curable by UV light.

  14 The lower glass plate (9) according to 12 or 13, wherein the lower glass plate (9) is made of glass, plastic or polycarbonate.

  15. The lower glass plate (9) according to any one of 12 to 14, wherein the hard paint is applied to the lower glass plate by a printing method using a plotter.

  16. The hard paint is applied to the lower glass plate (9) by a wet method, wherein a substantially random distribution of the paint is created by the local distribution of paint and the amount of paint applied. The lower glass plate (9) according to any one of the above.

  17. Any of the items 12 to 16, wherein the hard paint is excited with UV radiation for curing before the hard paint bleeds and is completely distributed and becomes a uniform smooth paint surface based on its surface tension. The lower glass plate (9) according to claim 1.

  18. The hard paint comprises urethane acrylate oligomer 21 to 25% by mass, epoxy acrylate oligomer 5 to 7% by mass, reactive monomer 40 to 44% by mass, reaction initiator 2 to 4% by mass, viscosity modifier 24 The lower glass plate (9) according to any one of 12 to 17 above, containing ~ 28% by mass and an additive of 0.3-0.5% by mass.

  19. The lower glass according to any one of 12 to 18, wherein the flat millimeter structure has a height of 0.01 to 0.1 mm, and an average diameter of each surface is 0.1 to 1.0 mm. Plate (9).

DESCRIPTION OF SYMBOLS 1 Surgical lighting 2 Ceiling arm system 3 Ceiling 4 Support arm 5 Swivel joint 6 Support arm 7 Swivel joint 8 Illumination housing 9 Light emission opening part / lower glass plate 10 Light source 11 Hollow reflector 12 Light beam 12 'Light beam 12 "Light beam 13 Grip component 14 Operating table 15 Patient 16 Surgical site 16 'Image of surgical site 17 Ray 18 Ray 20 Patient's eye 21 Scattered light pattern

Claims (19)

  Surgical illumination (1) comprising an illumination housing (8), wherein at least one light source (10) is arranged in the illumination housing (8), the illumination housing having a light exit surface, the light A transparent lower glass plate (9) is provided on the emission surface, and a transparent hard paint is applied to at least one surface of the lower glass plate (9), and the lower glass plate ( 9. The surgical illumination (1), wherein the reflective properties of 9) are altered and / or reduced, and the hard paint surface has a non-uniform and randomly distributed flat millistructure with intervening transition regions.   The surgical illumination (1) according to claim 1, wherein the hard paint is a paint curable by UV light.   The lower glass plate (9) is made of glass or plastic, and the light of at least one light source (10) passes through the lower glass plate (9) and illuminates the surgical site (16). Surgical lighting (1).   The surgical illumination (1) according to any one of claims 1 to 3, wherein the lower glass plate (9) is made of polycarbonate.   The surgical illumination (1) according to any one of claims 1 to 4, wherein the hard paint is applied to the lower glass plate by a printing method using a plotter.   The hard paint is applied to the lower glass plate (9) by a wetting method, wherein a substantially random distribution of the paint is produced by the local distribution of paint and the amount of paint applied. Surgical illumination (1) according to any one of the preceding claims.   7. The hard paint is excited with UV radiation for curing before the hard paint bleeds and is completely distributed and becomes a uniform smooth paint surface based on its surface tension. Surgical illumination (1) according to any one of the preceding claims.   The paint mixture is urethane-acrylate-oligomer 21-25% by mass, epoxy-acrylate-oligomer 5-7% by mass, reactive monomer 40-44% by mass, reaction initiator 2-4% by mass, viscosity modifier 24- The surgical illumination (1) according to any one of claims 1 to 7, comprising 28% by weight and an additive 0.3-0.5% by weight.   The operation according to any one of claims 1 to 8, wherein the height of the flat millimeter structure is 0.01 to 0.1 mm, and an average diameter of each surface is 0.1 to 1.0 mm. Lighting (1).   The surgical illumination (1) according to any one of claims 1 to 9, wherein the surgical illumination is attached to a pivotable ceiling arm system (2).   Surgical illumination (1) according to any one of the preceding claims, wherein at least one reflector (11) and / or at least one lens is provided in the surgical illumination housing (8).   In the lower glass plate (9) for use in the surgical lighting (1), a transparent hard paint is applied to at least one surface of the lower glass plate (9), and the lower glass plate ( The lower glass plate (9), wherein the reflective properties of 9) are changed and / or reduced, and the surface of the hard paint has a non-uniform and randomly distributed flat millimeter structure with intervening transition regions.   The lower glass plate (9) according to claim 12, wherein the hard paint is a paint curable by UV light.   The lower glass plate (9) according to claim 12 or 13, wherein the lower glass plate (9) is made of glass, plastic or polycarbonate.   The lower glass plate (9) according to any one of claims 12 to 14, wherein the hard paint is applied to the lower glass plate by a printing method using a plotter.   16. The hard paint is applied to the lower glass plate (9) by a wet method, wherein a substantially random distribution of the paint is created by a local distribution of paint and a coating amount of paint. The lower glass plate (9) according to any one of the preceding items.   17. The hard paint is excited with UV radiation for curing before the hard paint bleeds and is completely distributed and becomes a uniform smooth paint surface based on its surface tension. The lower glass plate (9) according to any one of the preceding claims.   The hard paint comprises urethane acrylate oligomer 21 to 25% by mass, epoxy acrylate oligomer 5 to 7% by mass, reactive monomer 40 to 44% by mass, reaction initiator 2 to 4% by mass, viscosity modifier 24 The lower glass plate (9) according to any one of claims 12 to 17, comprising -28% by mass and an additive of 0.3-0.5% by mass.   19. The lower part according to claim 12, wherein the height of the flat millimeter structure is 0.01 to 0.1 mm, and the average diameter of the individual faces is 0.1 to 1.0 mm. Glass plate (9).

Images