JPS5812094Y2 - Lighting device inside the instrument box - Google Patents

Description

[Detailed description of the invention] This invention combines a pre-molded synthetic resin transparent lens and a semi-transparent reflective tube, and embeds them integrally in the inner peripheral surface of the top opening when molding a synthetic resin instrument box. The present invention relates to an improved lighting system in a fixed instrument box.

Generally, in this type of device, by making the reflective tube that serves as the endpaper semi-transparent, some of the light from the light source installed at the bottom is reflected, and some of the light is transmitted and illuminated on the dial. It provides very effective illumination as soft indirect light that does not irritate the eyes.

However, on the other hand, the transmitted light enters the lens peripheral wall, resulting in a ring of light around the lens that is an eyesore. This had the disadvantage that visibility was poor because a ring of different colors could be seen through the lens.

The purpose of the present invention is to reduce the color of the reflective tube and the ring of light that occurs around the lens, and to improve the visibility of the instrument dial by providing soft indirect lighting.

An embodiment of the present invention will be described in detail below based on the accompanying drawings.

In the figure, the light source lamp 1 is located below the back surface of the dial 4 fixed to the upper part of the instrument body 3 in the barrel 2.
It is arranged for illuminating the upper scale and the pointer 5, etc.

In addition, a transparent lens 6 made of synthetic resin has a locking flange 7 around the upper opening of the container box 2, and a semi-transparent reflective tube 8 made of synthetic resin is attached to the back side of the flange 7. When the flat surface 9 is formed for a, continuous radial unevenness 1 is formed on the remaining part.
0 is formed, and the semi-transparent reflecting tube 8 is stacked on top of the other, and when the synthetic resin instrument box 2 is molded, it is embedded and fixed in the inner circumferential surface of the upper opening of the synthetic resin instrument box 2 to form an integral structure.

The height of the convex apex of the uneven portion 10 is equal to or lower than that of the flat surface 9.

In the above configuration, the illumination light from the light source lamp 1 is reflected or transmitted through the inner circumferential surface of the semi-transparent reflector tube 8 and is irradiated onto the front side of the dial 4, but only a portion of the transmitted light beam is reflected. The part reflects and transmits light while maintaining relatively straightness on the flat surface of the semi-transparent reflector tube 8, and is irradiated at the center position 1 of the dial 4, so that the inner periphery of the semi-transparent reflector tube 8 Combined with the indirect light reflected from the surface and irradiated to the peripheral part of the dial plate 4, it can be uniformly irradiated, and the scale and pointer 5 on the dial plate 4 can be easily read with soft illumination light.

This prevents the light that has passed through the semi-transparent reflector tube 8 from entering the peripheral wall of the transparent lens 6 and forming an unsightly ring of light around the lens 6. This is prevented by the uneven portion 10 formed on the back surface of the locking flange I. Most of the light from the light source lamp 1 is diffusely reflected by the uneven portion 10, and therefore light that passes through the peripheral wall of the lens 60 and appears around it. In very small amounts, it creates a ring of light that is practically an eyesore! Can be completely erased.

The light diffusely reflected by the uneven portion 10 passes through the semi-transparent reflector tube 8 again and irradiates the dial plate 4 uniformly, so that an illumination effect with improved visibility can be provided.

In addition, in order to maintain the dial illumination to be soft and not dark, if the reflector tube 8 is made of red or yellow, a ring of color will be created around the lens even during daytime, and visibility will be significantly reduced due to the relationship with the dial color tone. However, by forming the uneven portion 10, the color ring can be reduced and visibility can be improved as in the case of illumination.

Furthermore, by selecting the shape of the uneven portion 10, various patterns on the outer periphery of the lens 6 can be formed, and the design of the container box 2 can be improved.

Since the concavo-convex portion 10 can be integrally molded with the transparent lens 6, it is possible to eliminate unsightly colored buttons and light rays without using separate parts such as a light-shielding ring, and without affecting conventional molding methods. The ring can be removed, and at the same time, unlike a light-shielding ring that completely blocks light, it transmits a moderate amount of light, so even if it falls around the lens, the light is soft, and the front lens 6 allows you to see through the dial 4. It can also reduce discomfort.

Furthermore, the dial plate 4 can be more effectively illuminated by the diffusely reflected light from the uneven portions 10, and a significant improvement in visibility can be expected.

[Brief explanation of drawings]

FIG. 1 is a partially longitudinal side view of a meter equipped with the illumination device of the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a partially enlarged perspective view of a transparent lens.

Claims (1)

[Scope of utility model registration request] A semi-transparent reflective tube is embedded and fixed in the inner peripheral surface of the top opening of a synthetic resin instrument box, and a transparent lens is provided with a locking collar that covers the opening and comes into contact with the top surface of the semi-transparent reflective tube. In the instrument box that is integrally molded with the above-mentioned instrument box, an uneven part is formed on the back surface of the locking flange at the point where it contacts the semi-transparent reflector tube along at least the peripheral wall of the transparent lens, so that the light source provided inside the container box can be In addition to guiding the light rays to the front side through the semi-transparent reflector tube,
An illumination device in an instrument box that allows the upper surface of the semi-transparent reflector tube to be visually recognized through the uneven portion.