JPH09180512A - Vehicle lighting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent clouding on a reflecting surface by forming an air vent communicating the inside of a reflecting mirror with the outside on the reflecting surface or in its vicinity of the reflecting mirror, and making the position of the air vent almost coincide in front and in rear with a communicating hole of a lamp body. SOLUTION: A vehicle headlight 1 sucks gas into a lamp chamber 4 through a communicating hole 10 and an air vent part 11 and exhausts it to the outside. A filter 14 is fitted within a cylinder part 12 to prevent entering of dusts into the lamp chamber 4. Gas on the inside of a reflecting mirror 5 is compulsorily sucked out with the communicating hole 10 of a lamp body 2 locating in a position coinciding in front and in rear with an air vent 21 through the air vent 21 formed in the upper part of a reflecting surface 17, and flows on the reflecting surface 17 without staying. The reflecting surface 17 is hardly clouded, and even if the reflecting surface 17 is clouded, clouding is quickly removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel vehicular lamp. More specifically, the present invention relates to a technique for preventing fog on a reflecting surface.

[0002]

2. Description of the Related Art FIG. 9 shows an example a of a conventional vehicle lamp.

A vehicular lamp a has a lamp body b and a reflecting mirror e and a light bulb f arranged in a lamp chamber d formed by a lens c.

The lamp body b is opened to the front (the direction toward the left in FIG. 9 is referred to as the front, and the direction toward the right is referred to as the rear), and the opening of the lamp body b is provided with the lens c.
The lamp chamber d is formed by closing the lamp chamber with.

At the upper and lower ends of the rear wall of the lamp body b, communication holes g and g'for communicating the inside and the outside of the lamp chamber d are formed, respectively.

The reflecting mirror e has a bowl shape with a front opening, and the reflecting surface of the reflecting mirror e is subjected to a reflection treatment to form a reflecting surface h. It is supported so that it can tilt.

A light bulb attachment hole i is formed substantially in the center of the reflecting mirror e, and a light bulb f having filaments j and j'is detachably attached by appropriate means.

Therefore, the above-mentioned vehicular lamp a is a light bulb f.
Of the lens c attached to the front end of the lamp body b by reflecting the light emitted by turning on one of the filaments j and j'of the mirror c, which is not shown. It is controlled by a lens step or the like.

Then, gas is circulated in the lamp chamber d through the communication holes g and g'provided in the lamp body b, and the lamp chamber d
In addition to preventing the fog inside, the fog was removed when a fog portion was generated in the lamp chamber d.

[0010]

However, like the conventional vehicular lamp a, outside air is sucked in from the communication hole g ′ provided in the lower portion of the lamp body b, and the communication hole g provided in the upper portion of the lamp body b. In the method of discharging the gas from the lamp chamber d to the outside of the lamp chamber d, the gas flow becomes as schematically indicated by the two-dot chain line arrow in FIG. 9, and it is difficult for the gas flow to touch the reflecting surface h of the reflecting mirror e. If h is cloudy or the reflecting surface h is cloudy,
There is a problem that it takes a long time to remove the fog.

[0011]

In order to solve the above-mentioned problems, the vehicular lamp of the present invention is provided with a ventilation hole for communicating the inside and the outside of the reflecting mirror in the vicinity of the reflecting surface of the reflecting mirror or the reflecting surface of the reflecting mirror. Is provided so that the positions of the ventilation hole of the reflecting mirror and the communication hole of the lamp body substantially coincide with each other in the front and rear.

Therefore, according to the vehicular lamp of the present invention, a gas flow passing through the inside of the reflecting mirror can be created, so that the gas flow easily comes into contact with the reflecting surface of the reflecting mirror and the reflecting surface becomes cloudy. It is possible to prevent the above-mentioned phenomenon, and it is possible to shorten the time required to remove the haze once the reflecting surface becomes cloudy.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The details of the vehicular lamp of the present invention will be described below with reference to the accompanying drawings.

1 to 6 show a first embodiment of a vehicular lamp according to the present invention.

Reference numeral 1 denotes a vehicular lamp in which a reflecting mirror 5 and a light bulb 6 are arranged inside a lamp chamber 4 formed by a lamp body 2 and a lens 3.

The lamp body 2 is formed in a bowl shape from a synthetic resin or the like, and the front (the direction toward the right in FIG. 2 is the right, the direction toward the left is the left, and the direction toward the left in FIG. 3). Is defined as the front and the direction toward the right is defined as the rear.) By attaching a lens 3 having a lens step (not shown) having a lens step (not shown) to the front of the lamp body 2, The recess 7 is closed to form the lamp chamber 4.

The rear wall 8 of the lamp body 2 is formed with an opening 9, communication holes 10 and 10 ', and ventilation portions 11 and 11'.

The opening 9 is formed in the rear wall 8 at a position corresponding to the position of the light bulb 6 arranged in the lamp chamber 4, and is used for the replacement work of the light bulb 6, and is usually a detachable cover member 9a. Is blocked by.

The communication holes 10 and 10 '(only one of which is shown in the drawing) are located at the upper right and lower left of the position where the opening 9 of the rear surface wall 8 is formed, as viewed from the rear, respectively. The ventilation portions 11 and 11 ′ are formed so as to communicate with each other, and are formed so as to cover the communication holes 10 and 10 ′ on the rear surface side of the rear surface wall 8.

The communication holes 10, 10 'and the ventilation part 11,
The reference numeral 11 ′ is a direction in which the gas flows, that is, the gas inside the lamp chamber 4 is discharged by the communication hole 10 and the ventilation portion 11, and the gas outside the lamp chamber 4 is sucked by the communication hole 10 ′ and the ventilation portion 11 ′. Since the structure of each part is the same,
The communication hole 10 and the ventilation part 11 located at the upper right of the rear wall 8 will be mainly described, and the communication hole 10 ′ and the ventilation part 11 ′ located at the lower left of the rear wall 8 are communication holes located at the upper right of the rear wall 8. Most of the description is omitted by giving the same reference numerals to the similar portions in 10 and the ventilation portion 11.

The communication hole 10 has a circular opening surface, and a cylindrical tube portion 12 extending forward and backward is integrally formed with the rear wall 8 at the opening edge of the communication hole 10. A stopper 13 is formed at the front end of the so as to cross the center of the opening of the communication hole 10 left and right.

A filter 14 is fitted into the cylindrical portion 12 so as to close the communication hole 11, and the position of the filter 14 is defined by the front end of the filter 14 coming into contact with the stopper 13 of the cylindrical portion 12.

Inside the ventilation part 11, the cylindrical part 1 of the communication hole 10 is provided.
A labyrinth-like air passage 16 is formed by projecting partition plates 15, 15, ... From the rear wall 8 toward the rear so as to surround 2.

The gas in the lamp chamber 4 discharged from the communication hole 10 that communicates the inside and the outside of the lamp chamber 4 is ventilated by the ventilation part 11.
It is discharged to the outside through the ventilation passage 16 of. Further, at that time, since the filter 14 is fitted in the tubular portion 12, dust and dirt are prevented from entering the lamp chamber 4 with the flow of gas.

The reflecting mirror 5 has a reflecting surface 17 formed inside the reflecting mirror 5 by subjecting a paraboloid of revolution to reflection processing, and an upper edge of the reflecting surface 17 parallel to the optical axis XX of the reflecting surface 17. From the lower flat surface 19 that extends forward from the lower edge of the reflective surface 17 and is parallel to the optical axis X-X of the reflective surface 17, and the optical axis X of the reflective surface 17. It has a light bulb attachment hole 20 formed around -X and a vent hole 21 formed at the upper right of the light bulb attachment hole 20 when viewed from the back.

The ventilation hole 21 has a reflecting surface 17 at the reflecting surface 5.
A slit 22 is formed at a position along the rear edge of the upper flat surface 18, and a rib 22 extending rearward is provided at the upper opening edge of the vent hole 21.

The reflecting mirror 5 is tiltably supported on the lamp body 2 by a supporting mechanism (not shown).
The vent hole 21 formed in the reflecting mirror 5 is located in front of the position where the communication hole 10 of the lamp body 2 is formed.

The light bulb 6 has filaments 23 and 23 ', and is exchangeably supported in the light bulb attachment hole 20 formed in the reflecting mirror 5.

However, in the above vehicle lighting device 1,
Since the gas is sucked into the lamp chamber 4 and discharged through the lamp chamber 4 to the outside by the communication holes 10 and 10 'and the ventilation portions 11 and 11', the lens 3 and the reflection surface 17 may be clouded. Or the cloudiness can be promptly removed when cloudy once.

Also, the gas inside the reflecting mirror 5 is
7 through the vent hole 21 formed in the upper part of the vent hole 2
Since it is forcibly sucked out by the communication hole 10 of the lamp body 2 which is aligned with 1 in the front and rear, the gas does not stay in the reflecting mirror 5, and the gas flow contacts the reflecting surface 17 of the reflecting mirror 5. Since it becomes easier, the reflecting surface 17 is less likely to be fogged, and when the reflecting surface 17 is fogged, the fog can be quickly removed.

It is desirable that the vent hole 21 of the reflecting surface 17 and the communication hole 10 of the lamp body 2 be connected to each other, but since the reflecting mirror 5 must be tiltably supported with respect to the lamp body 2. The ventilation hole 21 of the reflecting surface 17 and the communication hole 10 of the lamp body 2 cannot be connected. Therefore, the amount of gas sucked from the inside of the reflecting mirror 5 is
It may be smaller than the amount of gas passing above the reflecting mirror 5 as schematically shown by the arrow 24 in FIG. Therefore, by providing the rib 22 on the rear end edge of the ventilation hole 21, it is possible to obtain the same effect as when the ventilation hole 21 and the communication hole 10 are arranged closer to each other, and the gas is removed from the inside of the reflecting mirror 5. While increasing the amount of suction, as schematically shown by an arrow 25 in FIG. 4, a spiral gas flow is created at a position directly below the rib 22 (a position directly behind the vent hole 21), and a flow is generated. The force of sucking gas from the pores 21 is strengthened.

By increasing the force of sucking the gas from the vent hole 21, it becomes possible to reduce the size of the vent hole 21 required to suck the same amount of gas.

Further, by forming the ribs 22, it is possible to obtain a cooling effect in the vicinity of the vent hole 21 and to increase the strength in the vicinity of the vent hole 21.

Further, by forming the air holes 21 in the reflecting surface 17 in the shape of slits along the upper flat surface 18 of the reflecting mirror 5, the air holes 21 are conspicuous when the reflecting surface 17 of the reflecting mirror 5 is viewed from the front. You can avoid it.

In addition, the ventilation hole 21 is connected to the optical axis X- of the reflecting surface 17.
By forming it at a position slightly offset from directly above X, the gas heated to a high temperature by the filaments 23, 23 'of the light bulb 6 is not immediately discharged from the ventilation hole 21, but rather the optical axis X of the reflecting surface 17. After being once moved above -X, it is discharged from the vent hole 21 while lowering the temperature. Therefore, even if the lamp body 2 is formed to have a lower heat resistant temperature than the reflecting mirror 5, it is discharged from the vent hole 21. There is no possibility that the communication hole 10 of the lamp body 2 and the vicinity of the ventilation portion 11 are deformed by the gas.

7 and 8 show a second embodiment of the vehicular lamp of the present invention. Compared with the first embodiment, only a part of the reflecting mirror is different, and the other parts are the same. It is the same. Therefore, only the reflecting mirror is shown in the description, and the same parts as those in the first embodiment will not be illustrated and described.

The reflecting mirror 5A includes a reflecting surface 17 and an upper flat surface 1
8, the lower flat surface 19, the bulb attachment hole 20, and the ventilation hole 2
1, a rib 22, and a second vent hole 26.

The second ventilation hole 26 is located at a position along the rear edge of the lower flat surface 19 immediately below the bulb mounting hole 20 in the reflecting surface 17 of the reflecting mirror 5A so that the inside and outside of the reflecting mirror 5A communicate with each other. It is formed in a slit shape.

As the gas inside the reflecting mirror 5A is sucked out through the vent hole 21 formed in the upper part of the reflecting surface 17, a part of the gas sucked into the lamp chamber 4 through the communicating hole 10 'is taken. Is sucked into the inside of the reflecting mirror 5A from the second ventilation hole 26 formed in the reflecting surface 17
It is possible to create a gas flow that passes through the inside of the chamber and escapes from the ventilation hole 21, and the gas does not stagnate in the reflecting mirror 5A, and the gas flow touches the reflecting surface 17 of the reflecting mirror 5A. Since it becomes easier, the reflecting surface 17 is less likely to be fogged, and when the reflecting surface 17 is fogged, the fog can be quickly removed. Further, by forming the second ventilation hole 26 in the shape of a slit along the lower flat surface 19, the second ventilation hole 26 becomes inconspicuous when the reflecting mirror 5A is viewed from the front.

Although the vent holes 21 and / or the second vent holes 26 are formed on the reflecting surface 17 in the above-described embodiments, the upper flat end surface 18 and / or the lower side may be used. The ventilation hole 21 and / or the second ventilation hole 26 may be formed near the reflection surface 17 at the rear end of the flat surface 19.

[0041]

As is apparent from the above description, in the vehicular lamp of the present invention, the lamp chamber is formed by covering the front portion of the lamp body with the lens, and the reflecting mirror having the reflecting surface in the lamp chamber. And a light source having a light emitting portion are arranged, and a lamp body is provided with a communication hole for communicating the inside and the outside of the lamp chamber, the reflecting surface of the reflecting mirror or the vicinity of the reflecting surface of the reflecting mirror. And a ventilation hole that communicates the inside and the outside of the reflecting mirror with each other, and the positions of the ventilation hole of the reflecting mirror and the communication hole of the lamp body substantially coincide with each other.

Therefore, according to the vehicular lamp of the present invention, a gas flow passing through the inside of the reflecting mirror can be created, so that the gas flow easily touches the reflecting surface of the reflecting mirror and the reflecting surface becomes cloudy. It is possible to prevent the above-mentioned phenomenon, and it is possible to shorten the time required to remove the haze once the reflecting surface becomes cloudy.

It should be noted that the specific shapes and structures of the respective portions shown in each of the above-mentioned embodiments are merely examples of the implementation in carrying out the present invention, and the technical forms of the present invention can be realized by these. The range should not be construed as limiting.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of a vehicular lamp of the present invention together with FIGS. 2 to 6, and is a front view.

FIG. 2 is a rear view.

3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is an enlarged cross-sectional view taken along the line IV-IV in FIG.

FIG. 5 is a front view of a reflecting mirror.

6 is a cross-sectional view taken along line VI-VI in FIG.

FIG. 7 shows a second embodiment of the vehicular lamp of the present invention together with FIG. 8, and this figure is a front view of a reflecting mirror.

8 is a cross-sectional view taken along the line VIII-VIII in FIG.

FIG. 9 shows an example of a conventional vehicular lamp, which is a vertical sectional view.

[Explanation of symbols]

 1 Vehicle Lamp 2 Lamp Body 3 Lens 4 Lamp Room 5 Reflector 6 Light Bulb (Light Source) 10, 10 'Communication Hole 17 Reflective Surface XX Optical Axis 18 Upper Flat Surface (Flat Surface) 19 Lower Flat Surface (Flat) Surface) 21 Vent hole 22 Rib 23, 23 'Filament (light emitting part) 5A Reflector 26 Second vent hole

Claims (5)

[Claims] 1. A lamp chamber is formed by covering a front portion of a lamp body with a lens, a reflecting mirror having a reflecting surface and a light source having a light emitting portion are arranged in the lamp chamber, and the lamp chamber is provided with A vehicular lamp having a communication hole for communicating the inside and the outside, wherein a ventilation hole for communicating the inside and the outside of the reflecting mirror is provided near the reflecting surface of the reflecting mirror or in the vicinity of the reflecting surface of the reflecting mirror. A vehicular lamp characterized in that the position of the ventilation hole of the mirror and the position of the communication hole of the lamp body substantially coincide with each other. 2. A flat surface substantially parallel to the irradiation direction is formed at the upper end of the reflecting mirror, and a slit-like vent hole is formed at a position substantially along the trailing edge of the flat surface. The vehicle lighting device according to claim 1. 3. A flat surface substantially parallel to the irradiation direction is formed at the lower end of the reflecting mirror, and a slit-shaped second ventilation hole is formed at a position substantially along the trailing edge of the flat surface. The vehicle lighting device according to claim 1 or 2. 4. The vehicular lamp according to claim 1, wherein a rib protruding rearward along the opening edge is provided at an opening edge of the vent hole. . 5. The vehicle according to claim 1, claim 2, claim 3, or claim 4, wherein the vent hole is formed at a position off the optical axis of the reflecting surface of the reflecting mirror. Lighting equipment.