JPS59230255A - Lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lamp used as a lighting light or indicator light in automobiles, transporters, etc., or as a street light.

An example of a lamp is shown in FIG. The basic structure consists of a lens, a reflector, a light bulb, and a rubber seal between the lens and the reflector.

When the light bulb inside the lamp is turned on, the gas inside the lamp is heated and pressurized. This gas is discharged from a location where the rubber packing material used as a sealing material between the lens and the reflecting plate is not completely sealed. Conversely, when a light bulb is turned off, the gas inside the lamp cools and contracts, resulting in a reduced pressure state. If water droplets are suspended outside the lamp in this reduced pressure state, there is a problem in that the water is sucked into the lamp interior through the incomplete sealing of the rubber packing material and stagnates therein.

This water can contaminate the interior of the lamp, corrode metal, and cause electrical leakage.

This is because the rubber packing material deteriorates after long-term use and loses its elasticity, making it impossible to maintain a tight seal.

Conventionally, from the viewpoint that it was unavoidable for water to enter the interior of the lamp, efforts were made to provide a drain port to prevent water from accumulating. However, it was not a perfect countermeasure, and there were problems such as contamination inside the lamp. The fact that water even once enters the interior of the lamp is an essential defect.

As a result of intensive searches for the structure of a lamp that does not allow water to enter, we found that the lamp has at least one opening, a porous body made of a water-repellent material is attached to this opening, and a porous body made of a water-repellent material is installed in the lamp. We have found that it is sufficient to provide ventilation with the outside through the mass body.

Since the pressure loss, that is, the ventilation resistance of the porous body is lower than the ventilation resistance of the gaps that are defects caused by deterioration of the rubber packing material, the gas inside the lamp selectively permeates through the porous body. Since the material of the porous body is made of water-repellent material,
Even if water splashes, it will be blocked by the porous surface and only air will be sucked in. Furthermore, inhaling air through a porous body also has the effect of removing particulate contaminants in the gas.

It should be noted that the water-repellent materials referred to here include single substances such as fluororesin, polyethylene, and polypropylene, and those that have been treated to make at least the surface water-repellent by silicone resin or fluororesin. Although a non-woven fabric structure is also suitable as the structure of the porous body, a structure with high air permeability and strength is more suitable for the present invention.
A porous structure having a fine fiber structure consisting of nodes interconnected by fibers and having a fiber diameter of 0.1 to 5 μm is optimal. Even if the resin is water-repellent, the pore size is important because if the pore size of the porous body is too large, water will pass through it. In order to prevent the permeation of water, the pore diameter must be 10 μm or less; conversely, if the pore diameter is too small, the pressure loss will increase and the effect of the porous structure will be difficult to repel, so the pore diameter should be 0.5 μm or less. Must be less than 1μ. Further, the porosity may be 30 to 95% so as to have sufficient air permeability, volatilization repellency, and a porous structure. Note that the shape of the porous body may be selected depending on the shape of the opening, such as a sheet, a tube, or a rod. Furthermore, it can be said that easily removable parts in which a water-repellent porous body is heat-sealed or physically attached to the end of a cylindrical molded product are easy to use.

[Brief explanation of drawings]

5 is a light bulb, 6 is a socket, 7 is a lead wire, and 8 is a porous body made of a water-repellent material. 5- Figure 1

Claims (5)

[Claims] (1) A penetration part to which a porous body made of water-repellent material is attached is provided in the part consisting of the lens, reflector, and light bulb of the lamp, and the lens and reflector are connected through the porous body made of water-repellent material. A lamp characterized in that a space consisting of a light bulb and a light bulb has ventilation with the outside. (2) The lamp according to claim 1, wherein the porous body made of a water-repellent material is a porous body made of a fluororesin. (3) The lamp according to claim 1, wherein the porous body made of a water-repellent material is a porous body made of tetrafluoroethylene resin. (4) The porous body has a fine fibrous structure consisting of nodules interconnected by fibers, and the diameter of the fibers is 0.1 to 5 μm.
Claim 1 or 2 characterized in that
or the lamp described in paragraph 3. (5) Claim 1 or 2 or 3 or 4, characterized in that the porous body has a pore diameter of 0.1 to 10μ and a porosity of 80 to 95%. The lamp mentioned.