JPH0410167B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The vehicle headlamp of the present invention will be explained in accordance with the following items.

A. Field of industrial application B. Outline of the invention C. Prior art D. Problem to be solved by the invention E. Means for solving the problem F. Example [Figs. 1 to 6] a. Lamp body [Fig. 1] [Fig. 1 to 4] b Pipe [Fig. 1 to 6] c Lens [Fig. 1 to 3] d Light bulb [Fig. 1 to 3] e Effect of pipe f Modification of lamp body [Fig. 7 to 9] f-1 First modification [Fig. 7] f-2 Second modification [Figs. 8 and 9] g Pipe modification [Fig. 10 to 12] ] g-1 First modification [Fig. 10] g-2 Second modification [Figs. 11 and 12] G Effects of the invention (A Field of industrial application) The present invention is applicable to a new vehicle. Regarding headlights. Specifically, the present invention provides a novel vehicle headlight that is suitable as a vehicle headlight and is capable of quickly removing fogging when the lens or reflective surface becomes cloudy during the initial lighting stage. This is what I am trying to do.

(B Summary of the Invention) The vehicle headlamp of the present invention has two protruding pipes that communicate with a lighting space defined by a lamp body and a lens, and the tip of one pipe extends from the bottom surface of the lamp body. When the vehicle starts running, negative pressure is generated at the tip of one pipe and the inside of the lamp space is The air inside the lamp space is forced to flow, such that air is forced to the outside and new air comes into the lamp space through the other pipe. The fogging that occurs on the inner surface of the lens and reflective surface due to the rapid temperature change at the beginning of lighting is quickly removed, and the two pipes are installed protruding from both the left and right sides of the dummy part of the lamp body. By doing so, more air can flow into the lamp space, and the installation of the pipe will not substantially narrow the reflective area or the opening of the pipe in the lamp space will be noticeable and unsightly. I tried to avoid it.

(C. Prior Art) In the case of vehicle headlights, especially automobile headlights, there is a large temperature difference between when they are not lit and when they are lit. Therefore, when the lamp is turned on, the lenses and reflective surfaces become cloudy due to a small amount of moisture in the lamp space. When the lens or reflective surface becomes cloudy, the transmittance of the luminous flux decreases, resulting in the inconvenience that a predetermined light distribution cannot be obtained and a sufficient field of view cannot be obtained.

By the way, the above-mentioned fogging is caused by the presence of moisture in the lamp space, so we tried to make the lamp a sealed type to prevent moisture from entering the lamp space, thereby preventing fogging on the lens and reflective surface. Automobile headlights have been proposed in the past.

(D Problems to be Solved by the Invention) However, no matter how high the degree of sealing is, it is extremely difficult to completely prevent moisture from entering the lamp space.

Therefore, instead of preventing moisture from entering the lamp space, the lamp space is communicated with the outside so that outside air passes through the lamp space, and the convection of air inside the lamp space that occurs when the lamp is lit is used. A so-called vent type automobile headlamp has also been proposed in which an attempt has been made to remove fog by passing outside air into the lamp space.

However, conventional vent-type vehicle headlamps have a problem in that the air flow within the lamp space is not very active and fogging cannot be removed quickly. In addition, in the case of a vehicle headlight that employs a lamp body with an integrated reflector that is equipped with a reflector that reflects the light emitted directly from the light bulb forward, the opening in the lamp space of the pipe should be connected to the reflector as described above. There are problems such as the amount of reflected light is reduced by substantially reducing the number of reflective surfaces, and the opening in the lamp space of the pipe is visible through the lens from the front, resulting in poor appearance. In particular, the opening in the pipe lighting space not only becomes an ineffective part that does not reflect light, but also distorts the shape of the surrounding reflective surface, so the area that does not reflect as expected is surprisingly large. There is the problem of becoming a thing.

(E. Means for Solving Problems) In order to solve the above-mentioned problems, the vehicle headlamp of the present invention communicates the lamp body with the lamp space defined by the lamp body and the lens. 2
Two pipes are made to protrude from both left and right ends of the dummy part of the lamp body, and further, the tip of one of the pipes is positioned below the lower surface of the lamp body and is formed into a beveled shape, and the beveled surface is It is oriented approximately backwards and downwards.

Therefore, in the vehicle headlamp of the present invention, when the vehicle starts running, negative pressure is generated at the tip of one of the pipes, and the air in the lamp space is forcibly discharged to the outside through the one pipe. As a result, new air flows into the lamp space through the other pipe, forcing the air inside the lamp space to flow, which causes rapid temperature changes in the initial stage of lighting. Even if fogging occurs on the inner surface of the lens, reflective surface, etc., such fogging is quickly removed.

In addition, the pipes protrude from both the left and right sides of the dummy part of the amplifier body, allowing more air to flow into the lamp space, and the provision of the pipes also reduces the effective area of the reflective part. The opening in the pipe's lighting space will not be abnormally noticeable when viewed from the front and will not make it look bad.Furthermore, even if dust etc. enters from the pipe, it will not stick to it. Since it is easy to do this at the opening of the pipe into the lamp space, that is, at the dummy section, the reflection performance will not be impaired.

(Embodiment F) [Figures 1 to 6] Details of the vehicle headlamp of the present invention will be described below with reference to illustrated embodiments. Embodiment 1 shown in the drawings is an example in which the present invention is applied to an automobile headlamp.

(a Lamp Body) [Figures 1 to 4] Reference numeral 2 denotes a lamp body, which is made of reinforced plastic reinforced by mixing synthetic resin, such as glass fiber.

The lamp body 2 has a slightly horizontally elongated rectangular opening at the front, and has a reflecting section 3 having a paraboloid of revolution reflecting surface on its inner surface, and from the opening edge of the reflecting section 3 to the side. A planar dummy portion 4 projecting like a flange is integrally formed. The dummy part 4 is a part 4 located above and below the dummy part 4.
The widths of a and 4b are narrow, and the widths of 4c and 4d located on both left and right sides are wide.

A light bulb mounting hole 5 is formed approximately in the center of the reflecting section 3, and a circular surrounding area is formed to surround the light bulb mounting hole 5 at a position slightly apart from the opening edge on the rear surface of the reflecting section 3. A wall 6 is integrally formed. A number of notches 7, 7, 7 are formed in the rear end surface of these surrounding walls 6. Further, several boss parts 8, 8, 8 are integrally formed adjacent to the outside of the surrounding wall 6, and these boss parts 8, 8, 8 have screw holes 9, 9,
9 is formed. There are ribs 10, 1 between these boss parts 8, 8, 8 and the surrounding wall 6.
0 and 10 are formed.

11 is a light bulb mounting plate, and an insertion hole 12 is formed in the center thereof. A circular wall 13 is formed forward from the opening edge of the insertion hole 12 on the front surface of the light bulb mounting plate 11, and the inner diameter of the wall 13 can fit snugly into the surrounding wall 6. It is formed in size. Further, notches 14, 14, 14 are formed in this wall body 13, and when the wall body 13 is fitted onto the surrounding wall 6, cutouts 14, 14, 14 are formed between the surrounding wall 6 and the boss portions 8, 8, 8. The ribs 10, 10, 10 formed in the above-mentioned notches 14, 14,
14. The light bulb mounting plate 11 has screw insertion holes 15, 15, 15.
are formed, and when the wall body 13 is fitted onto the surrounding wall 6, the screw insertion holes 15, 15, 15 coincide with the screw holes 9, 9, 9 formed in the boss parts 8, 8, 8. It's becoming like that. From the opening edge of the insertion hole 12 on the rear surface of the light bulb mounting plate 11, the insertion hole 1
Pressing pieces 16, 16, 16 protruding toward 2 are integrally formed, and these pressing pieces 1
One end in the circumferential direction of 6, 16, 16 is an introduction part 17, 17, 17 which is inclined so as to be gradually displaced rearward as it goes to the tip.

The light bulb mounting plate 11 as described above has its wall 13 fitted onto the surrounding wall 6 of the lamp body 2, and the screws 18, 18, 18 inserted through the screw insertion holes 15, 15, 15 are inserted into the lamp body 2. It is fixed to the lamp body 2 by being screwed into the screw holes 9, 9, 9 formed in the boss portions 8, 8, 8. In this state, the pressing pieces 16 , 16 , 16 of the light bulb mounting plate 11 are positioned so as to cover the notches 7 , 7 , 7 formed in the surrounding wall 6 of the lamp body 2 from behind, and the introduction portion 17 ,17,
Introductory slits 19, 19, 19 are formed between the tip of the slit 17 and the rear end surface 6a of the surrounding wall 6, and the gap becomes narrower toward the notches 7, 7, 7 side.

Reference numerals 20 and 21 denote connection pipes that integrally protrude from the rear surface of the upper end portions of the left and right dummy parts 4c and 4d of the lamp body 2. are in communication.

Incidentally, one of the connecting pipes may be provided so as to protrude from the rear surface of the lower end of the dummy portion 4c or 4d. In this way, more air can be expected to flow within the light chamber space, which will be described later, and the lens can be defogged more quickly.

(b Pipes) [Figs. 1 to 6] Reference numerals 22 and 23 are pipes, one ends of which are fixed to the connecting pipes 20 and 21 in an externally fitted manner.

The pipe 22 has an upper horizontal part 22a extending straight rearward from a part externally fitted onto the connecting pipe 20, an upper vertical part 22b extending downward from the rear end of the upper horizontal part 22a, and an upper vertical part 22b extending downward from the rear end of the upper horizontal part 22a. A lower horizontal portion 22 extending substantially horizontally from the lower end to the side.
c and a lower vertical portion 22d extending downward from the tip of the lower horizontal portion 22c are integrally formed, and the lower end of the lower vertical portion 22d is located further below the lower end of the lamp body 2. The lower end of the lower vertical portion 22d is obliquely cut at an angle of approximately 45°, and the beveled surface 24 faces toward the rear and lower part.

The other pipe 23 also has an upper horizontal part 23a, an upper vertical part 23b, a lower horizontal part 23c, and a lower vertical part 23d formed integrally, but the lower end of the lower vertical part 23d is located above the lower end of the lamp body 2. positioned.

Thus, one of the pipes 22 and 23 serves as a discharge pipe, and the other serves as an intake pipe.

(c Lens) [FIGS. 1 to 3] A lens 25 is airtightly attached to the front surface of the lamp body 2 so as to cover the front surfaces of the reflecting section 3 and the dummy section 4.

(d Light bulb) [Figures 1 to 3] 26 is a light bulb.

The light bulb 26 consists of a glass bulb 28 in which a filament 27 is enclosed, and a cap 29 in which the glass bulb 28 is supported.

A metal holder 30 is wound around the rear end of the glass bulb 28, and the holder 30 is attached to support pins 31, 3 protruding from the front end of the cap 29.
1,..., and thereby the glass bulb 2
8 and a base portion 29 are connected.

A connector portion 32 is integrally formed in the cap portion 29 , one end of a contact piece (not shown) is positioned within the connector portion 32 , and the other end of the contact piece protrudes from the front end of the cap portion 29 and extends from the glass bulb 28 . Connected to the external lead wire.

A flange 3 is located near the front end of the mouthpiece 29.
3 are protrudingly provided, and engagement pieces 34,
34, 34 are provided protrudingly. Note that the width of the engaging pieces 34, 34, 34 substantially matches the width of the notches 7, 7, 7 provided in the surrounding wall 6 formed in the lamp body 2, and the width of the engaging pieces 34, 34, 34
are adapted to fit snugly into the notches 7, 7, 7.

Reference numeral 35 denotes an O-ring made of an elastic material and attached to the outer peripheral surface of the front end of the mouthpiece 29.

Thus, the glass bulb 28 of the light bulb 26 is inserted into the light chamber 4 through the insertion hole 12 of the light bulb mounting plate 11 and the surrounding wall 6. Then, the engaging pieces 34, 34, 34 of the light bulb 26 come into contact with the rear surface of the pressing piece 16 of the light bulb mounting plate 11. Then, light bulb 26
The whole body is rotated so that the engaging pieces 34, 34, 34 move toward the entrances of the introduction slits 19, 19, 19 of the light bulb mounting plate 11. Then, the engaging pieces 34, 34, 34 are connected to the introduction parts 17, 17, 1
While bending 7 slightly backwards, insert the introduction slit 19,
19, 19, and eventually engages with the notches 7, 7, 7 provided in the surrounding wall 6, and in this state, the engaging pieces 34, 34, 34 engage the pressing pieces 16, 16, 16 of the light bulb mounting plate 11. It is held by being pressed from behind by 16. The light bulb 26 is thus attached to the lamp body 2, and
At this time, the O-ring 35 attached to the light bulb 26
is compressed with the inner circumferential surface of the surrounding wall 6, making the light bulb mounting part airtight.

Therefore, the lamp space 36 defined by the lamp body 2 and the lens 25 is communicated with the outside only through the two pipes 22 and 23.

(Function of e-pipe) In the above-mentioned automobile headlamp 1, when a car equipped with this headlamp runs, one of the pipes 2
Since the lower end of the pipe 22 is located below the lower end of the lamp body 2, the wind pressure associated with the running of the automobile is applied to the lower end of the pipe 22. Since the lower end of this pipe 22 is obliquely cut and the beveled surface 24 faces toward the lower rear, negative pressure is applied to the beveled surface 24 by the air flow that winds around and passes through the lower end of this pipe 22. occurs.

Therefore, the air in the lamp space 36 is forcibly discharged through the pipe 22 due to the negative pressure.
That amount of new air is replenished into the lamp space 36 through the other pipe 23.

In this way, in the above automobile headlamp 1, air flow is generated in the lamp space 36 as the automobile in which it is mounted runs, and the pipes 22 and 23 are formed into dummy parts. 4
Since the lamps protrude from both left and right sides 4c and 4d, more air flows within the lamp space 36, and this air movement is performed while always taking in outside air.

Therefore, in the above automobile headlamp 1,
Even if fogging occurs on the inner surface of the lens 25 or the reflective surface 3 due to lighting, once the car starts running, the fogging will be removed by the air flow that takes in outside air in the lamp space 36. It will be removed quickly.

Note that if the interior of the lamp space 36 is communicated with the outside, dust may enter the interior of the lamp space 36 and cause damage to the reflective surface 3.
However, if the pipes 22 and 23 are each formed with three bends, as shown in the above embodiment, the dust may adhere to the inner surface of the lens 25. It does not reach the upper ends of the pipes 22 and 23 because the speed is reduced. Also, each pipe 22, 23 has a horizontal section 2.
2a, 22c, 23a, 23c, even if dust enters into the pipes 22, 23,
The dust is removed from these horizontal parts 22a, 22
c, 23a, and 23c, and hardly enters into the lamp space 36.

Furthermore, even if dust were to enter the lamp space 36, the intruding dust would easily adhere to the portions where the inner ends of the pipes 22 and 23 are open, that is, the dummy portions 4c and 4d. 3, no dust will adhere to it, and its reflective performance will not be impaired.

Furthermore, water ingress is hardly a problem. That is, since the lower end of the pipe 22 is beveled, water droplets are less likely to adhere there.

Note that if the pipes 22 and 23 are made removably attachable to the lamp body 2 and replaced periodically, the inside of the lamp space 36 will be kept even more clean.

In addition, the inner diameter of the pipes 22 and 23 is 5 mm to 10 mm.
The most preferable range is . The reason is,
If the inner diameter is less than 5 mm, there is a risk of clogging due to the surface tension of water droplets adhering to the lower ends of the pipes 22, 23, and if it is more than 10 mm, there is a risk that water and dust may easily enter. It is.

Furthermore, it is desirable that the pipes 22 and 23 be connected to the lamp body 2 at the upper end of the lamp body 2. By doing this, pipe 2
The lengths of 2 and 23 can be made longer, which increases the effect of preventing the intrusion of dust and the like. When the connecting portion of the pipes 22 and 23 is located at the upper part of the lamp body 2, when viewed through the lens 25,
There is also the advantage that the connecting holes (the openings of the connecting pipes 20 and 21 on the lamp space 36 side) are less noticeable than when they are located on the lower side.

(f Modified example of lamp body) [Figures 7 to 9
FIG.] (f-1 First Modification) [FIG. 7] FIG. 7 shows a modification 2A of the lamp body.

In this lamp body 2A, a projecting wall 37 is formed close to the lower end of the shorter pipe 23 and facing the lower end opening of the pipe 23.

Therefore, there is an effect that dust and water splashing up from below are obstructed by the projecting wall 37 and difficult to enter the pipe 23.

(f-2 Second Modification) [FIGS. 8 and 9] FIGS. 8 and 9 show a second modification 2B of the lamp body.

A short duct 38 protruding from the lower end is formed in this lamp body 2B. The duct 38
is located so as to surround the side and bottom portion of the lower end of the pipe 22 by two side walls 39, 39 and a bottom wall 40, and the front part of this duct 38 is expanded in diameter toward the front end. An enlarged diameter portion 41 is formed.

Therefore, the airflow associated with the running of the car flows through the duct 3.
8, the flow path is narrowed to increase the flow velocity, and at the point where the flow velocity is increased, the lower end of the pipe 22, that is, the beveled surface 24
is located. Therefore, the negative pressure generated in the beveled surface 24 becomes higher, and thereby the lamp space 36
It is possible to improve the efficiency of evacuation of the air inside.

The presence of this duct 38 also has the effect of preventing water and dust from entering the pipe 22.

Further, although it is better if the bottom wall 40 is heated, a considerable effect can be achieved even without it.

(g Modified Example of Pipe) [Figures 10 to 12] (g-1 First Modified Example) [Figure 10] Figure 10 shows a modified example 22A (23A) of the pipe.

This pipe 22A (23A) is the pipe 22,
A portion 42 corresponding to the horizontal portions 22c and 23c of 23
and the end portion 42a on the lamp space 36 side.
is arranged at a lower position than the outer end 42b, and the other parts are the same as the pipes 22 and 23.

By providing such a portion 42, dust can pass through this portion 42 and reach the vertical portion 22b (23
b) becomes more difficult to ascend, and it is possible to more effectively prevent dust and the like from entering the lamp space 36.

(g-2 Second modification) [Figures 11 and 12] Figures 11 and 12 show another modification 2 of the pipe.
2B (23B).

This pipe 22B (23B) is the pipe 22,
A portion 43 corresponding to the horizontal portions 22c and 23c of 23
The inner diameter of the inner diameter is larger than that of other parts.

As a result, the air flow suddenly slows down in this portion 43, and the dust carried by the air flow is left behind in this portion 43, preventing dust from entering the lamp space 36. can be more effectively prevented.

(G Effect of the Invention) As is clear from the above description, in the vehicle headlamp of the present invention, the front opening of the lamp body to which the light bulb is attached is covered with a lens, and the lens of the lamp body is covered with a lens. The covered part is provided with a reflective part that reflects the light emitted directly from the light bulb forward, and a dummy part that is outside the periphery of the reflective part and does not have this function. Two pipes projecting from both left and right sides of the dummy part communicate with the lamp space defined by the lamp body and the lens, and the tip of one of the pipes is located below the lower surface of the lamp body. At the same time, it is characterized in that it is formed into a diagonal cut shape, and the diagonal cut surface faces substantially rearward and downward.

Therefore, in the vehicle headlamp of the present invention, when the vehicle starts running, negative pressure is generated at the tip of one of the pipes, and the air in the lamp space is forcibly discharged to the outside through the one pipe. As a result, new air flows into the lamp space through the other pipe, forcing the air inside the lamp space to flow, which causes rapid temperature changes in the initial stage of lighting. Even if fogging occurs on the inner surface of the lens, reflective surface, etc., such fogging is quickly removed.

In addition, the pipes protrude from both the left and right sides of the dummy part of the lamp body, allowing more air to flow within the lamp space. The pipe's opening in the light fitting space will not be abnormally noticeable when viewed from the front and will not make it look bad.Furthermore, even if dust, etc. enters from the pipe, it will not be damaged. Since it is easy to adhere to the opening of the pipe into the lamp space, that is, the dummy part, the reflective performance is not impaired.

[Brief explanation of drawings]

1 to 6 show an example of implementation of the vehicle headlamp of the present invention, in which FIG. 1 is a partially exploded perspective view, FIG. 2 is a vertical sectional view, and FIG. 3 is a partially exploded perspective view. A cross-sectional view taken along the - line in Figure 2, Figure 4 is an enlarged cross-sectional view of one pipe, Figure 5 is a side view of one pipe, Figure 6 is a rear view of one pipe, and Figure 7 is a lamp. FIGS. 8 and 9 are perspective views of main parts showing a first modification of the lamp body, FIG. 8 is a perspective view of main parts, and FIG. 9 is a perspective view of main parts, showing a second modification of the lamp body. 10 is a rear view showing a first modification of the pipe, FIGS. 11 and 12 show a second modification of the pipe, FIG. 11 is a rear view, and FIG. 12 is a rear view of a first modification of the pipe. 11
FIG. 2 is a cross-sectional view taken along line XII-XII in the figure. Explanation of symbols, 1...Vehicle headlight, 2...Lamp body, 3...Reflector part, 4...Dummy part, 2
2, 23...Pipe, 24...Beveled surface, 25...
Lens, 26... Light bulb, 36... Light space, 2A
...Lamp body, 2B...Lamp body, 22
A, 23A...Pipe, 22B, 23B...Pipe.

Claims (1)

[Claims] 1. The front opening of the lamp body to which the light bulb is attached is covered with a lens, and the part of the lamp body covered by the lens has a reflective part that reflects the light emitted directly from the light bulb forward. and a dummy part that does not have such a function and is located outside the periphery of the reflecting part, and a dummy part defined by the lamp body and the lens from both left and right sides of the dummy part of the lamp body. Two pipes that communicate with the lamp space are protruded from each other, and the tip of one of the pipes is located below the lower surface of the lamp body and is formed into a beveled shape, with the beveled surface extending substantially downward from the rear. Vehicle headlights characterized by facing