JPS60133317A - Reflection preventing device for vehicle instrument - Google Patents

Abstract

PURPOSE:To improve daze preventing effect and to make instruments thin, by forming a transparent plate, which is provided in front of an object that is visually observed by the human eyes, by many curved surfaces or slant surfaces so that at least the cross section on the front side of the plate forms a saw- tooth shape, as a continuous unitary body. CONSTITUTION:A transparent plate 8 is arranged in front of an instrument 2, which is mounted in an instrument panel 1. Many curved surfaces, which are inclined upward and forward, are formed in a unitary body in the transparent plate 8. At this time, the curved surfaces are not especially required. Flat slant surfaces, whose angles can reflect light into the part outside the field of view, can be used. Thus the transparent plate 8 can be attached in parallel with a dial 3. A thickness (w) of the transparent plate 8, which occupies a part of the instrument, can be greatly reduced in comparison with a conventional instrument. The surface reflection from the transparent plate 8 is guided to the absorbing surface of a hood 5 comprising a light absorbing surface, e.g., a black material. Then the reflected image is not cumbersome at all, the daze preventing effect is improved and the instrument can be made thin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for preventing reflection of a transparent body disposed as a front cover of a vehicle instrument.

Generally, when a flat transparent plate is used as the front glass of a vehicle instrument, the light irradiated on the surface is reflected directly towards the driver, making it difficult to read the dial and causing problems while driving. It will cause danger.

Therefore, a device has been proposed that bends the transparent plate to prevent reflection in the viewing direction.For example, as shown in FIG. A structure in which a transparent plate 4 which is curved by the transparent plate 4 is attached with an upward inclination and a hood 5 is protruded to absorb the light rays reflected by the transparent plate 4 and block the light rays from above, or a conical structure as shown in FIG. A device that has a similar anti-glare effect due to the transparent body 6 bulging out in a shape is widely used.

By the way, in the above-mentioned conventional anti-glare structure, the thickness of the entire instrument including the hood 5 increases, and it is necessary to install it by retracting it considerably into the engine room side in order to prevent danger from the protruding part toward the driver. However, there is a disadvantage that the instrument dial 3 is very difficult to read.

The present invention has an anti-glare effect similar to that of a structure in which the transparent plate is tilted or curved, and furthermore, the overall thickness of the instrument is made thinner so that installation space is reduced and the instrument is placed closer to the driver. The purpose of this is to improve visibility.

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

In FIG. 1, on the front of the instrument 2 attached to the instrument panel 1,
A transparent plate 8 integrally formed with a plurality of curved surfaces 7 inclined upward and forward is provided. The curvature of this curved surface 7 is approximately the same as that of the curved transparent plate 4 shown in the conventional example in FIG.
The sawtooth transparent plate 8 is attached parallel to the dial plate 3. Therefore, the thickness W of the transparent plate 5 in the entire instrument is significantly reduced compared to the thickness W of the conventional device shown in FIG. This makes it easier to read the dial 3.Furthermore, since external light is reflected by each curved surface 7 onto the absorbing surface of the hood 5, an anti-glare effect similar to that of the conventional device shown in FIG. 3 can be obtained.

In this case, if a large number of curved surfaces 7 are formed, the sawtooth irregularities can be reduced and the transparent plate 8 can be made almost parallel to the dial surface, but if there are many boundaries between the curved surfaces 7 and they are unsightly, By forming the curved surface 7 in several stages, it is possible to reduce the number of boundary lines and improve visibility. In this case, although the transparent plate 8 as a whole is tilted to some extent with respect to the dial surface, it can be made much thinner than the conventional structure.

FIG. 2 shows another embodiment of the present invention, in which a transparent plate 9
A cross section passing through the center of the field of view of the instrument 2 forms a vertically symmetrical sawtooth shape, and a plurality of curved surfaces 10 that slope outward and forward along a plurality of concentric circles are integrally formed. . The curvature of this curved surface [O] is approximately the same at the corresponding position as the circular transparent plate 6 shown in the conventional example in FIG.

With the above configuration, the light reflected by the curved surface 10 of the transparent plate 9 is absorbed by the absorbing surface of the hood 5, so that the driver does not receive the reflected light directly into his eyes, and can easily see the dial 3.
can be seen through.

Although each of the above-described embodiments has been described as a transparent plate formed of a curved surface, a configuration in which an inclined surface is formed may be used as long as the angle is such that the incident light is reflected out of the line of sight.

In this way, O's invention has a structure in which the transparent body covering the front surface of the A1 instrument has a sawtooth cross section and a plurality of curved or inclined surfaces are integrally formed, thereby making it possible to prevent the instrument from becoming thinner. It is possible to enhance the glare effect and achieve display with good visibility. In addition, as the instruments have become thinner, their protrusion into the engine room can be reduced, providing sufficient space for installing various devices, and there is no risk of a collision due to the hood protruding towards the driver. It is possible to provide an antireflection device with extremely high practical value.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view showing another embodiment of the invention, and Figs. 3 and 4 are Wi-plane views showing a conventional antireflection device. be. Instrument panel: l Instruments: 2 Dial: 3 Transparent plate: 4, 6, 8.9 Hood = 5 Curved surface near, 10 Figure 1 Figure 2 Figure 3 Figure 4 Procedural amendment December 1980 3 Mr. Manabu Shiga, Commissioner of the Japan Patent Office, 1. Indication of the case, Patent Application No. 150,81.3 of 1981, 3. Name of the invention: Anti-glare function. A transparent plate 2 having the invention, Claim 3, Detailed Description of the Invention [Technical Field of the Invention] The present invention provides a transparent plate 2 having a The present invention relates to an anti-glare structure of a transparent plate disposed on the front side of an object, and particularly relates to a transparent plate that reflects external light or a reflected image of an external object reflected on the surface out of the field of view. [Technical background of the invention and its problems] Generally, a transparent plate is installed on the front side of an object viewed by humans for the purpose of protecting the object or adjusting the amount of transmitted light when the object is a light emitting element. I often get hit. However, in order to clearly see objects through these transparent plates, it is necessary to finish the front and back surfaces with a mirror finish.For example, if the transparent plate is made of a transparent resin material such as hard glass or acrylic, the surface Due to the reflection of external light and external objects, the reflected image is visually recognized as a reflected image, which overlaps with the object to be viewed and is extremely difficult to see. In order to prevent glare caused by surface reflections on transparent plates, conventional structures have been adopted that provide anti-glare functions, such as applying an anti-reflection coating to the surface of the transparent plate or forming a curved shape on the transparent plate itself. There is. To explain an anti-glare structure in a vehicle instrument panel as a typical example, a device has been proposed that prevents reflection in the viewing direction by bending a transparent plate. A transparent plate 4 curved toward the front is attached to the front face of the dial 3 of the attached instrument 2 so as to be inclined upward, and a hood 5 is protruded to absorb the light rays reflected by the transparent plate 4 and to block the light rays from above. A structure having a transparent body 6 bulged in a conical shape as shown in FIG. 4, or a structure having a similar anti-glare effect as shown in FIG. 4, are widely used. However, with such an anti-glare structure, the thickness of the entire instrument including the hood 5 increases, and it is necessary to mount it considerably recessed into the engine compartment to prevent danger from protruding parts toward the driver. There is a drawback that the plate 3 becomes very difficult to see. These problems are not limited to the above-mentioned vehicle instrument panels, but are a common problem in those that have a transparent plate on the front of the visible object. desired. [Objective of the Invention] The present invention has been made in view of the above points, and provides an anti-glare effect similar to that of a structure in which a transparent plate is made in an inclined or curved shape and the light rays reflected on the surface are emitted out of the field of view. In addition, the overall thickness of the device is thin (to reduce installation space,
It is an object of the present invention to provide a transparent plate with good visibility without reflected images. [Summary of the Invention] The present invention provides a method in which a large number of sloped or curved surfaces are continuously formed so that the cross-section has a sawtooth shape, at least on the front side surface of a transparent plate that is placed in front of an object to be viewed and protects the object. By integrally forming a slope or a curved surface parallel to the slope or curved surface of the front side surface on the rear surface of the transparent plate, the surface reflection of the transparent plate is reflected out of the field of view. It is characterized by [Embodiments of the Invention] Although the use of the transparent plate according to the present invention is effective for various visual objects, the above-mentioned vehicle instrument panel will be described here as a typical example. For the sake of simple explanation of the drawings, parts common to those in FIGS. 3 and 4 as conventional examples are designated by the same reference numerals, and details are omitted. In Fig. 1, on the front of the instrument 2 attached to the instrument panel l,
A transparent plate 8 integrally formed with a large number of curved surfaces 7 tilting upward and forward is provided. If the curvature of this curved surface 7 is the same as that of the curved transparent plate 4 shown in the conventional example in FIG. The protrusion of the surface can also be reduced, but it is not necessary to have such a curvature, and it is sufficient to have an angle that allows the surface reflection to be reflected out of the field of view. Therefore, the transparent plate 8 can be attached parallel to the dial plate 3, and the transparent plate 8 can be attached parallel to the dial plate 3.
The thickness W of the entire meter is significantly reduced compared to the thickness W of the conventional device shown in FIG. 3, and the meter 2 can be positioned relatively forward, making it easier to read the dial 3. In this case, if the surface reflection on the transparent plate 8 is guided to the light absorption surface, for example, the absorption surface of the hood 5 made of a black material, the reflected image will not be noticeable at all, and an extremely good anti-glare effect can be expected. In this case, if a larger number of curved surfaces 7 are formed, the sawtooth irregularities can be made finer and the thickness can be approximately equal to that of the transparent plate 8, and the curved surfaces 7 can be arranged parallel to the dial surface. Even if the sawtooth irregularities become larger by reducing the number of dl, the overall transparent plate 8 is much thinner than the conventional structure.
It will be done. Here, in the embodiment, sawtooth curved surfaces 7 parallel to each other are formed on the front and back surfaces of the transparent plate 8 to prevent image shift of the visual object due to reflection on the inner back surface and prism action, but as a general rule, It is sufficient to form the transparent plate 8 on the front surface so as to diffuse the surface reflection out of the visual field, and the same effect can be obtained as an anti-glare function to eliminate the difficulty in seeing due to the overlap between the visible object and the reflected image. . FIG. 2 shows another embodiment of the present invention, in which a transparent plate 9
The cross section passing through the center of the field of view of the instrument 2 forms a vertically symmetrical sawtooth shape, and a large number of curved surfaces 10 that slope outward and forward along a large number of concentric circles are integrally formed. . The curvature of this curved surface 10 is approximately the same as that of the conical transparent plate 6 shown in the conventional example in FIG. Even in the above configuration, since the light reflected by the curved surface 10 of the transparent plate 9 is absorbed by the absorption surface of the hood 5, the driver can see through the dial plate 3 without directly receiving the reflected light. . Although all of the above-mentioned embodiments have been described as a transparent plate consisting of a set of curved surfaces, if the angle is such that the incident light is reflected outside the field of view, a sawtooth transparent plate structure consisting of a set of flat inclined surfaces can be used. If sawtooth-like irregularities are formed finely, the thickness of the transparent plate can be made thin, and it can be placed directly on the object to be viewed, or through a gap, or even overlaid on a regularly provided transparent plate. It is possible to arrange them freely. [Effects of the Invention] As described above, the present invention provides a transparent plate provided on the front side of an object to be viewed by a person, in which a large number of curved or inclined surfaces, at least the front side cross section of which has a sawtooth shape, are continuously and integrally formed. With this structure, reflections from the surface of the transparent plate are reflected outside the field of view, preventing deterioration of perspective view due to overlap between the visual target and the reflected image, and enabling perspective view with extremely good visibility. Furthermore, since the transparent plates can be arranged in parallel, if they are used, for example, as transparent protection plates for vehicle instrument panels, the anti-glare effect can be enhanced without compromising the slimness of the instruments. As a result, the protrusion into the engine compartment can be reduced, so there is sufficient space for installing various devices, there is no risk of collision due to the hood protruding toward the driver, and the instrument display surface can be moved more forward. It is possible to provide a transparent plate with an anti-glare function that has high utility value in an extremely wide range of applications, such as being able to improve visibility by arranging it on the side. 4. Brief description of the drawings FIG. 1 is a sectional view showing one embodiment of a transparent plate according to the present invention.
FIG. 2 is a sectional view showing another embodiment of the present invention, and FIGS. 3 and 4 are sectional views showing a conventional transparent plate. 1: Instrument gi 27 Instrument 3: Dial plate 8.9 = Transparent plate 5: Hood 7. to: curved surface

Claims (1)

[Claims] In a device in which the transparent plate placed on the front of the instrument is bent or bent to prevent reflection in the viewing direction, multiple inclined or curved surfaces are integrally formed so that the cross section is sawtooth. This anti-reflection device for vehicle instruments is characterized by a transparent plate placed on the front of the instrument dial.