JPS5813697Y2 - Instrument pointer illumination device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a pointer illumination device for instruments such as vehicles.

Recently, in order to improve the visibility of instruments such as vehicles, in addition to illuminating the scale plate, the pointer itself is molded with transparent acrylic resin, etc., and the pointer illumination is used to guide light and make the pointer shine. It's starting to look like this.

This pointer illumination also does not mainly irradiate the pointer with light, but instead uses a light guide plate under the dial, irradiates the light guide plate with light directly from a light source, and uses light from the light guide plate at the part where the light guide plate and the pointer base face each other. The pointer base receives the light and reflects it to the pointer, making the pointer shine.

To explain this further, for example, as shown in a vertical side view in FIG. 1, a pointer base 2 is fitted into a light guide plate 1.

Although not shown, the light guide plate 1 is irradiated with light from a light source at other parts and shines.

The light from the end face 3 of the light guide plate on the pointer base side is irradiated onto a reflective surface 4 made of a circumferential slope provided inside the pointer base 2, and the reflected light from this is reflected from the pointer base 2. It reaches the reflective surface 5 provided above, reflects this S, and becomes the pointer 6.
It reflects and makes the pointer shine.

However, since the reflective surface 5 provided above the pointer base 2 needs to reflect the reflected light from it to the pointer 6, its reflection range is only about 4 out of the total circumference 3600.

Therefore, even if the pointer base 2 receives light from all 360 degrees around the light guide plate 1 and reflects it on the reflective surface 4, only about 4 of the light can be received and reflected on the upper reflective surface 5. .

That is, in the conventional device, only the light entering from the light guide plate on the side where the pointer 6 is located reaches the pointer.

As a result, the brightness of the pointer would change due to variations in the light entering the light guide plate, and the entire device would feel dark and lacking in light.

In order to improve these points, the present invention has been developed as a result of intensive studies, in which a reflective surface consisting of a circumferential slope is formed on the lower inner side of the pointer base, and the inner surface of the top of the pointer body is made a reflective surface consisting of a spherical surface.
In addition, by providing a reflective surface made of a concave spherical surface tilted in the direction of the pointer provided on the pointer base inside the center of the pointer base, light from the end face of the entire circumference of the dial or light guide plate on the side of the pointer base can be reflected. By having the pointer reach the pointer through the plurality of reflective surfaces and making the pointer shine, the object was successfully achieved.

Now, an example of the implementation of this invention will be explained with reference to FIG. 2 of the attached drawings.
is inserted.

A reflective surface 4 made of a circumferential slope is formed on the lower inner side of the pointer base 2, and a reflective surface 7 made of a spherical surface is formed on the inner surface of the top of the pointer base 2.

Furthermore, a reflecting surface 8 made of a concave spherical surface tilted in the direction of the pointer 6 is provided inside the center of the pointer base body 2 .

Now, light from the end surface 3 of the entire circumference of the light guide plate 1 on the pointer base side enters the pointer base 2 from the entire circumference, is received by the reflecting surface 4 consisting of a circumferential slope provided on the lower inner side, and is reflected from there. The light is reflected on a reflective surface 7 made of a spherical surface on the inner surface of the top of the pointer base 2, and the reflected light is further reflected on a reflective surface 8 made of an inclined concave spherical surface provided inside the center of the pointer base 2, and The reflected light is reflected onto the pointer to make it shine.

This allows the entire amount of light from the entire circumference of the light guide plate 1 to effectively reach the pointer.

Of course, this does not change at all even with the rotation of the pointer, that is, the pointer base.

In the present invention, in order to improve the reflection efficiency of each reflective surface, it is possible to color the surface by painting, etc., or to make it a mirror surface by vacuum deposition, etc., and to improve the light gathering effect of the spherical surface. A spherical surface can also be a parabolic curve.

In the above description, the light guide plate provided on the pointer base was explained, but this is not limited to the light guide plate, and it goes without saying that the dial plate may also serve as the light guide plate.

Since the present invention is constructed as explained in detail above, it has a simple mechanism and does not require any special parts such as a
Since all the light from the entire circumference of the end face of the light guide plate can be guided to the pointer to make the pointer shine, the pointer will not be dark due to insufficient light, and the brightness of the pointer will not change depending on the pointer position, making driving easier. This is an extremely practical and excellent device that allows even people to see the instrument pointers with sufficient brightness and stable brightness.

[Brief explanation of drawings]

The accompanying drawings are for explaining the present invention, and FIG. 1 is a vertical side view of a conventional device, and FIG. 2 is a vertical side view showing an example of the implementation of the present invention. DESCRIPTION OF SYMBOLS 1... Light guide plate (dial), 2... Pointer base, 4... Reflective surface consisting of a circumferential slope, 6...
...Pointer, 1...Reflection surface consisting of a spherical surface,
8... Reflective surface consisting of a concave spherical surface.

Claims (1)

[Scope of utility model registration request] A reflective surface consisting of a circumferential slope is formed on the lower inner side of the pointer base, and a reflective surface consisting of a spherical surface is formed on the top inner surface of the pointer base, and the inside of the center of the pointer base is formed in the direction of the pointer provided on the pointer base. By providing a reflective surface made of an inclined concave spherical surface, light from the end face of the entire circumference of the dial or light guide plate on the pointer base side passes through the plurality of reflective surfaces and reaches the pointer, causing the pointer to shine. An instrument pointer illumination device characterized by: