JPH075206U - Vehicle lighting - Google Patents

Abstract

(57) [Abstract] [Purpose] In a vehicular lamp, to prevent damp outside air from flowing into the lamp housing and prevent fogging of the lens. [Constitution] A room 6 is formed on the back surface of the lamp housing 2 of the vehicle lamp, and the room 6 is communicated with the inside of the lamp housing 2 through a ventilation hole 7 and is communicated with the outside through a ventilation pipe 8 so that the inside of the room 6 is dried. Agent 9 is filled.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle lamp in which air flows in and out between the inside and the outside of the lamp housing due to heat generation and the like.

[0002]

[Prior art]

 In a conventional vehicle, as disclosed in Japanese Utility Model Laid-Open No. 142806/1983, the inside of the lamp housing is connected to the outside by a connecting pipe or a hose so that the inside of the lamp housing can be ventilated. When the lamp is turned on, the temperature inside the lamp housing becomes extremely high.Therefore, when the lamp is off, the inside of the lamp housing is rapidly cooled, and a considerable amount of outside air is taken into the lamp housing. Moisture is inhaled, causing the lamp lens to fog from the inside. Also, although there is a thin film with fine holes attached to the connecting tube, moist outside air flows into the lamp housing. It was difficult to prevent this from happening, and it was inevitable that the lens would fog from the inside.

[0003]

[Problems to be solved by the device]

 The present invention intends to prevent fogging of the lens in a vehicular lamp by suppressing the inflow of moist outside air into the lamp housing with a simple structure.

[0004]

[Means for Solving the Problems]

 In order to achieve this object, a vehicular lamp according to the present invention includes a ventilation passage communicating between a lamp housing and the outside air, a chamber formed in the ventilation passage, and a desiccant filled in the chamber. ing.

[0005]

[Action]

 Therefore, when the inside of the lamp housing, which has been hot due to the lighting of the lamp, is rapidly cooled by the extinguishing of the lamp and the pressure inside the lamp housing drops, and the outside air flows into the lamp housing through the ventilation passage, The contained water is surely adsorbed by the desiccant filled in the room in the middle of the ventilation path, and the intake of moist outside air into the lamp housing is suppressed.

[0006]

【Example】

 Hereinafter, the embodiments of the present invention shown in the drawings will be described by assigning the same reference numerals to the same portions. 1 and 2, the vehicle outdoor lamp 1 has a lens 3 mounted on the front surface of a lamp housing 2, and a square tube portion 4 formed on the back surface of the lamp housing 2, and a cover 5 is attached to the square tube portion 4. Is detachably attached to form a room 6, and the interior of the lamp housing 2 and the interior of the room 6 are communicated with each other by a vent hole 7, while the U-shaped vent pipe 8 attached to the lid 5 The inside of the chamber 6 is communicated with the outside, and the room 6 is filled with a granular desiccant 9 such as silica gel.

Therefore, when the lamp 1 is turned on, the internal pressure of the lamp housing 2 rises as the temperature inside the lamp housing 2 rises, and a part of the air inside the lamp housing 2 is sequentially blown into the vent hole 7, the chamber 6 and the vent pipe 8. When the lamp 1 is turned off, the interior of the lamp housing 2, which had been at a considerably high temperature, is rapidly cooled and the internal pressure drops, and the ventilation pipe 8 and the room 6 are sequentially installed from the outside. The outside air is sucked into the lamp housing 2 through the vent holes 7 and the air holes 7. At this time, if the outside air contains moisture, the moisture is absorbed by the desiccant 9 when the outside air passes through the room 6. Since it is adsorbed, damp outside air is not taken into the lamp housing 2, so that the lens 3 is reliably prevented from being fogged from the inside, and the safety of the vehicle operation can be ensured.

Further, the moisture adsorbed on the desiccant 9 is easily separated from the desiccant 9 by the high temperature air flowing out of the lamp housing 2 when the lamp 1 is turned on, and is removed to the outside together with the high temperature air. Therefore, the desiccant 9 can be effectively used for a long period of time, and the desiccant 9 can be replaced with a new one by removing the lid 5 as needed, which is convenient and easy to use. There is.

Next, in the embodiment shown in FIGS. 3 and 4, a box-shaped case 10 is attached to the rear surface of the lamp housing 2 of the vehicle outdoor lamp 1 with its ears 11 being screwed. The inside of the case 10 and the inside of the lamp housing 2 are communicated with each other by the ventilation pipe 13 connected to the connection pipe 12 of the above and the lamp housing 2, and the inside of the case 10 is filled with the granular desiccant 9. A thin film made of Teflon 15 having a large number of fine holes is attached to an intake / exhaust port 14 formed at the bottom of the case 10.

Therefore, when the outside air is sucked into the lamp housing 2 when the lamp 1 is turned off as in the case of the above embodiment, when the outside air passes through the thin film 15 from the intake / exhaust port 14, the thin film 15 causes a certain amount of air. In addition to blocking moisture, the desiccant 9 adsorbs moisture in the outside air when passing through the case 10, so that only dry air is sucked into the lamp housing 2 and, therefore, the same as above. As a result, it is possible to reliably prevent the lens 3 from being fogged from the inside and ensure the safety of driving the vehicle.

Further, since the thin film 15 is attached to the intake / exhaust port 14 at the bottom of the case 10, it is easy to prevent the desiccant 9 in the case 10 from dropping from the intake / exhaust port 14, and further, it is necessary. In accordance with the above, the connecting pipe 12 of the case 10 is removed from the ventilation pipe 13, the ear 11 is unscrewed, the case 10 is removed from the rear surface of the lamp housing 2, and the new case 10 filled with the desiccant 9 is removed. It is very convenient because the unit can be easily replaced.

[0012]

[Effect of device]

 In the vehicular lamp according to the present invention, when the outside air flows into the lamp housing in response to the temperature change in the lamp housing, the moisture contained in the outside air is ensured by the desiccant filled in the room along the ventilation path. It is possible to prevent the lens lens of the lamp from being fogged from the inside, and to secure the safety of driving the vehicle because the outside of the lamp housing is prevented from being sucked in and moist outside air is taken into the lamp housing. In addition, the desiccant in the air passage can be easily replaced if necessary, which is very convenient in practice.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is an enlarged vertical cross-sectional view of a main part of the above embodiment.

FIG. 3 is a perspective view of another embodiment of the present invention.

FIG. 4 is an enlarged vertical cross-sectional view of main parts of the other embodiment.

[Explanation of symbols] 1 lamp 2 lamp housing 6 room 7 ventilation hole 8 ventilation pipe 9 desiccant 10 case 13 ventilation pipe 14 intake / exhaust port 15 thin film

Claims (1)

[Scope of utility model registration request] 1. A vehicular lamp having a ventilation passage communicating between a lamp housing and the outside air, a chamber formed in the ventilation passage, and a desiccant filled in the chamber.