JPS63137043A - Visorless meter for vehicle - Google Patents

Abstract

PURPOSE:To make a meter visor unnecessary by stretching a smoke glass crepe-processed with fine recesses and projections on the surface in front of a meter and forming a reflectionless film deposited with magnesium fluoride on the surface of the recesses and projections. CONSTITUTION:A pointer shaft 3 to be fitted with a pointer 4 is protruded from a front dial face 2 of a meter unit 1, and a smoke glass 5 with low light permeability is stretched in front of it. The crepe processing forming fine recesses and projections is applied on the surface of a smoke glass 5, and magne sium fluoride is deposited on the surface to form a reflectionless film 6. The reflection coefficient can be extremely decreased, a sum visor to prevent the reflection of the solar light is not required, the visual field in front of a driver's seat can be expanded, and an expansive feeling can be given to the driver.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the prevention of light reflection on the surface of a meter mainly used in four-wheeled motor vehicles.

In order to prevent the reflection of sunlight, conventional vehicle meters use a meter visor to remove excess light, and the visor lens has a curvature to prevent light reflected from the lens surface from entering the driver's eyes. That's what I was doing.

For example, a conventional example in the case of a four-wheeled motor vehicle is shown in FIGS. 8 and 9.

A meter 03 is installed on an instrument panel 02 in front of a steering wheel 01, and a meter visor 04 projects rearward above the meter 03 to form an eaves.

The meter 03 is located between the meter visor 04 and the column cover 05, and a visor lens 06 is also fitted between the meter visor 04 and the flam cover 05 on the steering wheel 01 side.

The outer surface of the pi 1F lens 06 is formed with a concave curved surface, and in the example of FIG. 8, the center of curvature is located above the lens 06.

Sunlight from the outside is blocked by the meter visor 04 except in front of the meter 03, giving it directionality so that the light enters the meter 03 approximately perpendicularly, and in this way, the sunlight is directed approximately in one direction. After the light is reflected by the curved surface of the visor lens 06 as shown by the arrow in FIG. 8, the light travels downward, reaches the matte black column cover 05, and is absorbed.

Therefore, the light reflected on the surface of the visor lens 06 does not enter the driver's eyes 07 and does not interfere with the reading of the meter 03.

In the example shown in FIG. 9, the center of curvature of the curved surface of the surface of the visor lens 06 is upward, and the sunlight that is incident approximately parallel to the meter visor 04 is reflected by the visor lens θG.
It is reflected by the curved surface of the meter visor 0 and travels upward.
Since it is absorbed by the ceiling surface of the eaves which is matted in black color, the display on the meter 03 is made easy to see as in the previous example.

However, since all the light reflected by the curved surface of the visor lens 06 travels upward or downward and is absorbed, it is necessary to give the light incident on the visor lens 06 directionality. A meter visor with some width is required.

Since such a meter visor is provided so as to protrude from the instrument panel 02 to the right side of the vehicle, the presence of this meter visor has the disadvantage that the presence of the meter visor hinders the sense of openness of the Shinai for the driver.

The present invention was made in view of these points, and is therefore a piracyless meter in which the meter visor of a vehicle is made a ruler by applying a non-reflective coating to the surface of the translucent plate in front of the meter. .

By applying a non-reflective coating to the surface of the translucent plate of the meter, the reflection rJi rate of light incident on the plate surface from all directions is reduced, so there is no need to provide directionality to the incident light, and therefore, the meter visor is designed for this purpose. is deemed unnecessary.

In addition, by providing unevenness on the surface of the light-transmitting plate and applying an anti-reflective coating thereon, the anti-reflective coating reduces the
At a lower rate, the remaining reflected light can be diffusely reflected to make the meter display easier to read.

Furthermore, by placing a light control film on the back surface of the light-transmitting plate, it is possible to impart directionality to the transmitted light and prevent the light from being diffused from the meter display section, particularly from being projected onto the front window.

'LU] An embodiment of the present invention illustrated in FIGS. 1 to 3 will now be described.

FIG. 1 is a longitudinal sectional view of a speed link of a four-wheeled motor vehicle.

Push the finger button shaft 3 from the center of the front dial 2 of the meter unit 1.
protrudes, and a pointer 4 is attached to its tip.

A smoked glass 5 having a low light transmittance is stretched in front of the pointer 4, and the smoke is subjected to a grain treatment to form fine irregularities on the surface of the lath 5.

Magnesium fluoride M Q F 2 is vapor-deposited on the surface of the smoked glass subjected to the grain treatment to form a non-reflective coating 6.

Generally, the reflectance at the interface between two media is derived from Fresnel's formula in optical theory.

For example, when air (refractive index no = 1) is in direct contact with glass (refractive index n9 ``'' 1.52), the reflectance R of normal incident light at the interface is R = ((no - n9) / (no +ng))
100=4.3(%).

However, when a coating with a refractive index n is applied to glass, a phenomenon occurs in which the light reflected at the interface between the coating and the air and the light reflected at the interface between the glass and the coating interfere and cancel each other out, and the wavelength λ If the thickness d of the film is set so that nd = λ/4 holds true for the incident light of The ideal coating has a refractive index n=, 1”Tdn*=(goT5T= 1.23 <7
) It depends on the material.

Therefore, a thin film of magnesium fluoride MQF2 with a refractive index n=1.39 is used as a practically possible material, and the calculation results in a reflectance of R=1.43%.

Therefore, by applying a non-reflective coating 6 of magnesium fluoride to the smoked glass 5, the reflectance can be reduced to the i-end.

Figure 2 shows the results of an actual experiment.

The reflectance when no coating is applied (indicated by the dashed line) is approximately 4.3% regardless of the wavelength λ, but by applying the anti-reflection coating 6 of magnesium fluoride, the reflectance over the entire visible light range is increased. (shown as a solid line) has decreased, especially at wavelength 500, the lowest reflectance is 1.43% per person due to the thickness of the coating.
It shows.

Furthermore, in this embodiment, since the surface of the smoked glass 5 is grained, the reflected light that has been reduced by the non-reflective coating 6 is further diffusely reflected, thereby reducing the reflectance.

That is, as a result of the graining treatment, the reflectance is reduced by about 1% overall as shown in FIG.

As described above, in this embodiment, by applying a non-reflective coating and graining the surface of the smoked glass 5, it is possible to suppress the reflectance of visible light to a low level of 1% to 2%, which prevents it from entering the driver's eyes. The reflected light is extremely weak and does not interfere with the reading of the meter pointer 4.

In this way, the meter according to this embodiment reduces the reflected light itself rather than changing the direction of the reflected light as in the conventional case, so that the reflected light can be reduced by the meter alone as shown in FIG. Since it does not obstruct the reading, there is no need for a meter visor, and as shown in Figure 3, it does not take up much space even when placed on the instrument panel 7 in front of the driver, and it can be placed within the driver's front field of vision without pressure. Doesn't give a feeling.

Figure 3 shows the meter visor 04 in a conventional meter.
For comparison, the two cars are shown using two-dot chain lines, but it is clear that the six vehicle spaces are different, and since a meter visor is not required, the forward field of vision is widened, giving the driver a sense of openness.

The above is an application of the present invention to an anagrometer that reads the angular displacement of a pointer.
(liquid crystal display), fluorescent display tube display, E
It is also possible to apply a non-reflective coating to the surface glass of digital meters such as EL (Electroluminescence).

FIG. 4 shows an example in which the present invention is applied to an LCD meter.

A liquid crystal 12 is disposed on a substrate 10 with a back light source 11 behind it, and a glass 13 covers it.

The surface of the glass 13 is grained and coated with a non-fouling film 14.

Further, FIG. 5 shows an example in which the present invention is applied to a fluorescent display tube display.

A fluorescent display tube 16 is fixed on the substrate 15, and the fluorescent display tube 16 is made up of a display glass substrate 17 coated with phosphor at predetermined positions, a vacuum tube 18, and a glass 19.

The surface of the glass 19 is grained to form a non-reflective coating 20]
-Tinging.

In this way, even in meters using liquid crystal and fluorescent display tubes, by graining the surface glass and coating it with a non-reflective coating, reflected light on the glass can be significantly reduced, making the meter display easier to read without a meter visor. Therefore, the feeling of openness in front is not obstructed.

Next, an embodiment in which a light control film is provided on the back side of the front transparent plate is shown in FIGS. 6 and 7 and will be described.

This embodiment is applied to a fluorescent display tube display, and numeral 30 is a fluorescent display tube.

An acrylic plate 31 with a low light transmittance is arranged in front of the acrylic plate 31, and the surface of the acrylic plate 31 is coated with a non-reflective coating 32 after graining treatment as in the previous embodiment.

In this embodiment, a light control film 33, which is a louvered filter, is stretched on the back surface of the acrylic plate 31 to block light that is going to pass through the acrylic plate 31 diagonally and to allow only light that is perpendicular to the acrylic plate 31 to pass.

The light control film 33 blocks incident light particularly from diagonally above to prevent strong light from entering the fluorescent display tube 30, and also prevents light from the fluorescent display tube 30 from being diffused to the outside at night. You can prevent it from being projected onto the window.

That is, as shown in FIG. 7, depending on the positional relationship between the meter 34 and the front window 35, if the light emitted inside the meter 33 is diffused, a part of it may be transmitted to the front window 35.
The reflected light may enter the driver's eyes.

At this time, the driver will be bothered to see the projection of the meter 34 on the front window 35, and although it would be possible to use a meter visor to prevent this, this is contrary to the purpose of the present invention.

Therefore, by providing the light control film 33 on the back side of the acrylic plate 31 as in this embodiment, the light from the meter 34 is given directionality, so that the display light enters only the driver's eyes, and the light is directed to the front window 35. can prevent the projection of

By applying a non-reflective coating to the surface of the translucent plate in front of the meter, the reflected light on the surface of the translucent plate can be reduced, making the meter display easier to read and eliminating the need for a meter visor. This makes the area in front of the driver feel wider, giving the driver a sense of openness.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view on the speed side of an embodiment of the present invention, Fig. 2 is a diagram showing the decrease in reflectance in an experiment, and Fig. 3 is a speedometer of this example installed on the instrument panel. FIG. 4 is a sectional view of the main part when the present invention is applied to an LCD, FIG. 5 is a longitudinal cross-sectional view of the main part when the present invention is applied to a fluorescent display, and FIG. 6 is a side view of the main part. is a vertical cross-sectional view of main parts of another example using a light control film,
Figure 7 is an explanatory diagram showing the progress state of light from the meter, Figure 8
FIG. 9 is a diagram showing the progress state of light in a conventional meter. 1...meter unit, 2...dial, 3...
Pointer axis, 4... fingers! 1.5...Swake glass, 6
... Non-reflective coating, 7... Instrument panel,
DESCRIPTION OF SYMBOLS 10... Substrate, 11... Back light source, 12... Liquid crystal, 13... Glass, 14... Anti-reflective coating, 15...
... Substrate, 16... Fluorescent display tube, 17... Display glass substrate, 18... Vacuum tube, 19... Glass, 20...
...Anti-reflective coating, 30...Fluorescent display tube, 31...Acrylic plate, 32...
...Anti-reflective coating, 33...Light control film, 34...Meter, 35...Front window.

Claims (3)

[Claims] (1) A visor-less meter that eliminates the need for a meter visor in vehicles by applying a non-reflective coating to the surface of the translucent plate in front of the meter. (2) The visorless meter according to claim 1, characterized in that fine irregularities are formed on the surface of the transparent plate, and a non-reflective coating is applied thereon. (3) The visor-less meter according to claim 1, characterized in that a light control film that imparts directivity to transmitted light is stretched on the back surface of the transparent plate according to claim 1.