JPS62201401A - Light transmitting plate having glare shielding function - Google Patents

Abstract

PURPOSE:To control the diffusion of light guided into a visual field and to improve visibility by forming a fine rugged part at least on a part of a field through which reflected light reflected by a rising wall surface of a saw tooth projecting part or a rising wall surface on a light transmitting plate is guided is guided into the visual field. CONSTITUTION:Since the reflected light of external light which is reflected by the surface side of a light transmitting plane 1 is reflected by the light transmitting plane 3 of the saw tooth projecting part 5 is guided to the outside of the visual field in a direction other than the visual direction, the visivility is improved. Even if light irradiated from the surface side of the light transmitting plane 1 or light irradiated from the back side of the light transmitting plate 1, e.g. light irradiated from an internal light source arranged in a display device such as an indicator, is made incident onto the medium of the light transmitting plate 1 and a part of the incident onto the medium of the light transmitting plate 1 and a part of the incident light 6 irradiates the rising wall surface 4 of the saw tooth projecting part 5, the irradiation light 6 is dispersed by the fine rugged part 7 formed on the rising wall surface 4. The rising wall surface 4 can be prevented from inconvenience such as partial glaring emission.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a transparent plate disposed as a front cover of a display device, and in particular, the present invention relates to a transparent plate disposed as a front cover of a display device. The present invention relates to a see-through plate that has an anti-glare function that reflects light rays out of the visual field in a direction other than the viewing direction.

(Prior Art) Generally, various display devices have a transparent plate covering their display surface, but when a flat transparent plate such as a glass substrate or a transparent synthetic resin substrate is used as the transparent plate, However, there is a problem in that external light irradiated onto the surface of the see-through plate is directly reflected in the direction of the line of sight, causing the surface of the see-through plate to shine and reducing visibility.

In order to solve this problem, a transparent plate having an anti-glare function has been proposed. For example, a flat surface is formed on the back side of the cross-sectional shape, and serrated protrusions consisting of an inclined surface and a surface perpendicular to the flat surface are formed in parallel lines on the front side. It is known from Publication No. 133701.

[Problem that the invention seeks to solve]

In the above-mentioned conventional technology, a part of the external light is reflected on the inclined surface of the serrated projection and guided out of the field of view in a direction other than the viewing direction.In this case, an internal light source or Light rays emitted from the back side of the display part of a self-luminous display or external light from the front side of the display surface are reflected on the serrated vertical surface and guided within the field of view in the line of sight direction, causing the inclined surface to glow. In addition, there has been a problem in that the irradiated light from the back side of the display surface is reflected by the inclined surface and guided into the field of view, resulting in a plurality of overlapping images, which tends to reduce visibility.

The present invention has been made in view of the above circumstances, and provides a see-through plate having an anti-glare function that can prevent vertical surfaces from shining or multiple images from appearing overlapping by adjusting the viewing angle. be.

[Means for solving problems]

The feature of the present invention is that fine irregularities are formed to adjust the viewing angle in at least part of the area where the reflected light from the rising wall surface of the sawtooth protrusion or the rising wall surface on the transparent surface is guided into the visual field. , which improves visibility by controlling the diffusion of the amount of light guided within the field of view.

[Effect]

At least a portion of the reflected light rays that are emitted from the rear side of the display surface or external light from the front side of the display surface and are reflected on the wall surface and guided into the field of view are diffused by the fine irregularities.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

1 and 2 show a first embodiment of the present invention, in which, in the case of an indicating instrument such as an automobile, a see-through plate 1 is formed of a colorless transparent material, and the back surface of this see-through plate 1 is shown. The side, that is, the display surface side of a display device (not shown) is formed as a flat surface 2, and the display surface is formed with a transparent surface 3 inclined at an angle set with respect to the flat surface 2 and with respect to the flat surface 2. Protrusions 5 with fine sawtooth cross-sections are formed in parallel lines and are formed of rising wall surfaces 4 extending perpendicularly to each other. (not shown) is formed on the rising wall surface 4 that reflects the light, for example, fine unevenness 7 such as a textured surface.

Therefore, a part of the external light is reflected by the see-through surface 3 of the saw-toothed protrusion 5 and guided out of the field of view in a direction other than the line of sight. Even if a portion of the irradiated light from the back side of the display surface or the external light from the front side of the display surface enters the rising wall surface 4 of the sawtooth-shaped protrusion 5, this incident light ray is formed on the rising wall surface 4. The light is diffused and diffusely reflected by the fine irregularities 7, so that the entire amount of the irradiated light 6 can be prevented from entering the visual field.

FIG. 3.4 shows a second embodiment of the present invention, and the same reference numerals are used for the same parts as in the first embodiment. The transparent plate 1 is made of a colored transparent material. The rear side of this transparent plate 1, that is, the display surface side of a display device (not shown) is formed into a flat surface 2, and the display surface has a cross-sectional shape consisting of a transparent surface 3 and a wall surface 4 rising up from the flat surface 2. forms fine serrated protrusions 5 in parallel lines,
The area A of the transparent surface 3 where the irradiated light 6 from the back side of the display surface or the external light (not shown) from the front side of the display surface rises and the reflected light 8 reflected on the wall surface 4 is guided into the visual field. Fine uneven portions 9 are formed at least in part.

In this case, the area A where the line of sight is in the oblique direction with respect to the perpendicular to the flat surface 2 of the see-through plate 1 is determined as follows.

That is, as shown in FIG. 4, when the inclination angle of the transparent surface 3 is α and the line of sight is in the direction of the inclination angle γ from the flat surface 2, the irradiation light 6 incident on the transparent plate 1 from the back side or the front side External light incident on the transparent plate 1 and reflected on the flat surface 2 is guided into the visual field as a refracted light ray 6A with a refraction angle α-γ.

Then, from the intersection point 11 of the irradiation light 6 passing through the trough 10 or the external light and the transparent surface 3 to the sawtooth protrusion 5, the sawtooth protrusion 5
The range up to vertex 12 is region A. In this case, the angle θ of the irradiating light ray 6 or the external light with respect to the perpendicular to the flat surface 2 is 5 in (α−θ), where n is the refractive index of the medium, so it is obtained as follows. In this case, if γ=O, that is, the area A is obtained when the line of sight is perpendicular to the flat surface 2 of the see-through plate 1.

Then, by forming fine uneven portions 9 on the transparent surface 3 over the entire width or more than the entire width of the area A, the wall surface 4 rises up.
It is possible to prevent the reflected light 8 from being diffused by the fine irregularities 9 formed on the see-through surface 3, and the entire amount of the reflected light 8 from entering the field of view.

FIG. 5 shows another embodiment, in which the see-through plate 1 is made of a colored transparent material. For example, in the case of an indicating instrument such as an automobile, the surface side of the transparent plate is A protrusion 5 having a serrated cross-sectional shape is formed at the top of a rising wall surface 4 that is substantially parallel to the direction of the viewer's line of sight, and a transparent surface 3 that extends from the top of the rising wall surface 4 and is inclined at an angle α to the direction of the user's line of sight. The ridgeline of the wall 4 is continuously formed in fine parallel lines in the horizontal direction, and the rising wall surface 4
A fine uneven portion 13 is formed near the top of the transparent surface 3.

This colored transparent plate 1 can be formed by using transparent glass containing dye IA, or by coloring a transparent resin material by blending dye IA and particles, etc., so that the light rays from the light source can be used as a display medium at night, etc. After illuminating the dial, the illumination light beam may pass through the see-through plate 1 to the extent that the dial can be sufficiently recognized.

The operation of this embodiment configured as described above will be explained. First, a large number of serrated protrusions 5 consisting of a rising wall surface 4 and a transparent surface 3 are continuously formed on the surface of the transparent plate 1. Since the light is reflected outward, the dial, which serves as a display medium, can be read well. On the other hand, the dial is irradiated with light rays of external light that have entered from other directions and passed through the see-through plate 1, so that the dial can be read from outside the see-through plate 1.

At this time, some of the external light is repeatedly internally reflected between the front surface and the back surface of the transparent plate 1, but is diffused by the fine irregularities 13 formed on the rising wall surface 4 and the transparent surface 3. Therefore, the same effects as in each of the above-described embodiments can be obtained.

Incidentally, the uneven portions 7, 9 and 13 of each of the above-mentioned embodiments are the same as those of the transparent plate 1.
In other words, when molding the transparent plate 1, an uneven portion is formed in advance in a part corresponding to the rising wall surface 4 or a part of the transparent surface 3 of the transparent plate 1, and the uneven portion is formed at the same time as the transparent plate 1 is molded. 7, 9, and 13 may be formed, and after molding the transparent plate 1, a part of the rising wall surface 4 or the transparent surface 3 may be surface-treated to form an uneven portion. , 9.13 may be formed.

Furthermore, various modifications can be made within the scope of the gist of the present invention; for example, as shown in FIG. It is preferable to form the uneven portion 15 in the shape of a shape, and to gradually change the width of the flat portion 14 forming the uneven portion 15 when the viewing area of the see-through plate 1 is large and the viewing direction is likely to change.

For example, if the width of the uneven portion 15 of the perspective surface 3 in a portion where the line of sight is perpendicular to the flat surface 2 is B, the uneven portion 15 above it
If the width of is B゛ and the width of the lower uneven part is Bpa, then B >
B' = B" or B >B">B" or B
By gradually changing the brightness so that B<B', etc., it is possible to visually recognize the image with substantially uniform brightness.

Further, in this embodiment, the rear surface of the transparent plate 1 is a flat surface 2, but sawtooth protrusions 5 may be formed in the same manner as on the front surface. Furthermore, although the transparent surface 3 is formed upward from the top, it may be formed downward. Furthermore, this embodiment is not limited to instruments for vehicles (it can also be applied to other instruments and display devices such as televisions).

〔Effect of the invention〕

As described above, the present invention has a small area in which the light reflected from the rising wall surface of the sawtooth protrusion or the rising wall surface on the transparent surface is guided into the field of view (with fine irregularities that can partially diffuse the light beam). Since the irradiation light from the back side of the display surface or the external light from the front side of the display surface rises, it becomes possible to control the diffusion by the uneven parts formed on the wall surface or the transparent surface, so that the rising wall surface shines, This prevents images from appearing to overlap and improves visibility.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a perspective view, FIG. 3 is a perspective view showing a second embodiment of the present invention, and FIG.
The figure is a schematic explanatory diagram showing the reflective area when the line of sight is in a direction other than the perpendicular direction of the flat part, and FIG. 5 is a sectional view showing another embodiment.
FIG. 6 is a perspective view showing a case where the width of the uneven portion is changed. 1-m-See-through plate 2-Flat surface 3--See-through surface 4-Rising wall surface 5-Protrusion? , 9.13.15-... Uneven part A... area

Claims (1)

[Claims] A transparent plate is formed from a colorless transparent material or a colored transparent material,
The back side of this transparent plate is a flat surface, and the front side thereof has a cross-sectional shape consisting of a transparent surface inclined at an angle set with respect to the flat surface, and a rising wall surface extending in a direction perpendicular to the flat surface. In a see-through plate having an anti-glare function in which saw-toothed protrusions are formed in parallel lines, reflected light from the rising wall surface of the saw-toothed protrusions or the rising wall surface on the transparent surface is guided into the visual field. 1. A see-through plate having an anti-glare function, characterized in that fine irregularities capable of diffusing light rays are formed in at least a part of the area.