JPH08222008A - Lighting appliance for vehicle - Google Patents

Abstract

PURPOSE: To prevent confinement of heat caused by a light source in a lighting chamber by forming a ventilating hole in a reflecting mirror of a lighting appliance in which the light source is arranged in the light chamber partitioned with the reflecting mirror and an inner lens. CONSTITUTION: A headlamp 1 has a reflecting mirror 19 in a lighting appliance space 18 partitioned with a lamp body 2 and a front lens 3. A reflecting part 21 for a beam for passing each other of the reflecting mirror 19 forms a lighting chamber 29 together with an inner lens 27 for luminous intensity distribution control, covering a front edge opening of the reflecting part 21. Ventilating holes 30, 31 are formed in the upper part and the lower part of an electric bulb 38 of the reflecting part 21 respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular lamp in which a light source is arranged in a lamp chamber defined by a reflecting mirror and an inner lens. It is intended to provide a new vehicular lamp that does not block heat.

[0002]

2. Description of the Related Art A vehicular lamp is provided with a reflecting mirror arranged in a lamp space defined by a lamp body and a lens covering the opening, and an inner lens provided so as to cover the opening of the reflecting mirror. Are known.

FIG. 7 shows an example a of such a lamp.

Reference numeral b is a lamp body made of synthetic resin, and an opening c facing forward (the irradiation direction of the lamp is the front).
Are covered by the lens d.

In a lamp space e defined by a lamp body b and a lens d, a reflecting mirror f made of synthetic resin is arranged, and the reflecting mirror f has an opening g facing forward. There is.

Reference numeral h denotes an inner lens which covers the opening g of the reflecting mirror f from the front, and has a lens step (not shown) formed therein.

Reference numeral i denotes a light bulb, and its glass bulb j passes through light bulb insertion holes k and l formed in the lamp body b and the reflection mirror f, respectively, and an inner lens h and a reflection mirror f are formed.
It is located in the lamp room m defined by and. The bulb insertion hole 1 formed at the rear end of the reflecting mirror f is closed by the flange n of the bulb i, so that the lamp chamber m is a closed chamber.

[0008]

By the way, in the lamp a as described above, as shown by the arrow in FIG.
Since the air warmed by the heat of the lamp moves to the upper part of the lamp room m, it may cause the fogging of the inner lens h and the disturbance of the light distribution. There is a problem that f may be deformed.

[0009]

In order to solve the above-mentioned problems, the vehicular lamp of the present invention has a reflecting mirror and an inner lens arranged in the lamp body, and an image is formed by the reflecting mirror and the inner lens. In a vehicular lamp in which a light source is arranged in a formed lamp chamber, ventilation holes are formed in upper and lower portions of a reflecting mirror with a light source interposed therebetween.

[0010]

Therefore, according to the present invention, by forming the ventilation holes above and below the light source so as to sandwich the light source, an air flow is formed between the lamp chamber defined by the reflecting mirror and the inner lens and the outside thereof. Then, the heat in the lamp chamber can be dissipated to the outside of the lamp chamber.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the vehicular lamp of the present invention will be described below with reference to the illustrated embodiments. In addition, the illustrated embodiment is one in which the present invention is applied to a vehicle headlight.

Reference numeral 1 denotes a headlamp, and a lamp space 4 is defined by a lamp body 2 which is open to the front and a front lens 3 which covers the opening of the lamp body 2 from the front.

The lamp body 2 is made of synthetic resin and has a recess 2a which is open toward the front. A lens mounting portion 5 for mounting the front lens 3 is formed on the front opening edge, and the lens mounting portion 5 is formed with a mounting groove 5a that is open toward the front.

The lamp body 2 has two parts 2A and 2B.
Are connected to each other, and a reflection means for a traveling beam is arranged in a housing space 4a defined by a portion 2A and a portion of the front lens 3 corresponding thereto, and a portion 2B and a front surface corresponding to the portion 2B. Reflecting means for the passing beam is arranged in the accommodation space 4b defined by the lens 3 portion.

The rear wall 6 of the portion 2A is integrally formed with a cylindrical tubular portion 7 protruding rearward. The inner peripheral surface of the tubular portion 7 is a protrusion projecting toward the center of the tubular portion 7. A large circular opening 9 is formed by the wall 8.

Further, the rear wall 10 of the portion 2B is integrally formed with a cylindrical tubular portion 11 protruding rearward, and the inner peripheral surface of the tubular portion 11 is provided so as to project toward the center of the tubular portion 11. A large circular opening 13 is formed by the protruding wall 12 thus formed.

The front lens 3 is formed by integrally forming a front surface portion 14 that covers the front surface of the recess 2a of the lamp body 2 and a peripheral wall portion 15 that projects rearward from the peripheral edge of the front surface portion 14 with a synthetic resin. Then, the rear end portion of the peripheral wall portion 15 is fitted into the installation groove 5a of the lamp body 2 via the sealant 16, and in this state, the leaf spring clips 17, 17, ....
The front lens 3 is fixed to the lamp body 2 by sandwiching the rear end portion 18 of the peripheral wall portion 15 and the mounting portion 5 from the side (see FIG. 1).

Reference numeral 19 is a reflecting mirror made of synthetic resin, and a reflecting portion 20 for a traveling beam and a reflecting portion 21 for a low beam are integrally formed. Although not shown, the reflecting mirror 19 is supported on the lamp body 2 by an aiming mechanism (not shown) so that it can be tilted vertically and horizontally in the lamp space 4.

The reflecting portion 20 is formed by integrally forming an effective reflecting portion 20a having a predetermined reflecting surface and a side surface portion 20b projecting forward from the peripheral edge of the effective reflecting portion 20a.
Then, a light bulb mounting hole 22 is formed substantially in the center of the effective reflection portion 20a (see FIG. 2).

Further, the reflecting portion 21 is formed by integrally forming an effective reflecting portion 21a having a predetermined reflecting surface and a side surface portion 21b protruding forward from the peripheral edge of the effective reflecting portion 21a. .. are formed on the front end portion 23a of the upper surface 23 of the side surface portion 21b (only one of them is shown in FIG. 4), and on the bottom surface portion 25 of the side surface portion 21b. Has an engaging hole 25a (see FIG. 3). And, in the substantially central portion of the effective reflection portion 21a,
As shown in FIG. 5, a light bulb mounting hole 26 is formed,
The bulb mounting hole 26 is an I-shaped hole that extends in the vertical direction, and a notch 26a that continuously extends to the side and is formed to define the mounting orientation of the bulb.

Reference numeral 27 denotes an inner lens that covers the opening of the reflecting portion 21, and is made of a glass material or a synthetic resin. As shown in FIG. 3, the inner lens 27 is provided at its lower end with a protrusion 27 a protruding downward, and this is provided with an engaging hole 25 in the side face 21 b of the reflector 21.
.. (only one of which is shown in the figure) is attached to the portion near the upper end of the inner lens 27 and the reflection portion 21 as shown in FIG. The inner lens 27 can be attached to the reflecting portion 21 by being hooked on the steps 24, 24, ... Of the upper surface portion 23 and sandwiching the inner lens 27 and the portion near the front end of the reflecting portion 21 from the side. ing. In this way, the inner lens 27 and the reflecting portion 21 define the lamp chamber 29.

Reference numerals 30 and 31 denote round bracket-shaped ventilation holes formed in the effective reflection portion 21a (see FIG. 5). The ventilation holes 30 are located above and below the bulb mounting hole 26. The pores 31 are located. These ventilation holes 30, 31
Is provided to form a flow path for allowing the air warmed by the heat of the electric bulb to escape to the outside of the lamp chamber 29. That is, the vent hole 30 is a heat dissipation hole, the vent hole 31 is an intake hole,
The air that has flowed into the lamp chamber 29 through the ventilation hole 31 is warmed by the heat of the light bulb, and then discharged to the outside of the lamp chamber 29 through the ventilation hole 30. When the shape of the effective reflection portion 21a has perfect or approximate rotational symmetry with the optical axis as the rotation axis,
When the vent holes 30 and 31 are arranged on a circle centered on a point on the optical axis when viewed from the back, and the vent holes 30 and 31 are formed into a round bracket shape according to the curvature of the reflection surface, It is possible to reduce distortion in the vicinity of the ventilation holes 30 and 31 when the mirror 19 is molded.

Reference numeral 32 is a light bulb for a traveling beam (see FIG. 2), and its glass bulb 32a has an opening 9 in the lamp body 2.
Is disposed in the reflecting portion 20 through the light bulb mounting hole 22. The base portion 33 of the light bulb 32 is provided with a flange 34 at a position slightly rearward from the middle. When attaching the light bulb 32 to the reflection portion 20, the glass bulb 32a and the front half of the base portion 33 are inserted into the light bulb attachment hole 22 while positioning the light bulb 32 in the light bulb attachment hole 22, and the flange 34 is attached to the reflection portion. The rear end face of 20 is brought into contact. Then, the bulb 32 may be attached to the reflecting portion 20 while the flange 34 is pressed against the rear end surface of the reflecting portion 20 by elastically contacting the rear end portion of the base portion 33 with the set spring 35.
In addition, one end of the set spring 35 has the reflecting portion 20.
The rear end surface is fixed with a screw, and the other end is locked by a locking claw 36 protruding from the rear end surface of the reflecting portion 20. Also, light bulb 3
2, the base portion 33 projects rearward from the light bulb mounting hole 22 in a state where the base portion 33 is mounted on the reflecting portion 20, and contact pieces 37, 37 project rearward on the rear end surface of the base portion 33.

Reference numeral 38 denotes a light beam for a low beam, and its glass bulb 38a is arranged in the lamp chamber 29 from the opening 13 of the lamp body 2 through the light bulb mounting hole 26 of the reflecting portion 21. The base portion 39 of the light bulb 38 is provided with a flange 40 at a position slightly rearward from the middle. When attaching the light bulb 38 to the reflection portion 21, while positioning the protrusion (not shown) formed on the flange 40 so as to fit the notch 26a of the light bulb attachment hole 26, the glass bulb 38a and the front half of the base portion 39 are attached to the light bulb. The flange 40 is inserted into the hole 26 and brought into contact with the rear end surface of the reflecting portion 21. Then, the light bulb 38 may be attached to the reflecting portion 21 while the flange 40 is pressed against the rear end surface of the reflecting portion 21 by elastically contacting the rear end portion of the base portion 39 with the set spring 41.
It should be noted that the set spring 41 has one end portion having the reflecting portion 21.
The rear end surface is fixed with a screw, and the other end is locked by a locking claw 42 projecting from the rear end surface of the reflecting portion 21. Also, light bulb 3
8 is attached to the reflector 21 and the light bulb attachment hole 2
A contact piece 43 is projected rearward from the rear end surface of the mouthpiece 39 which is projected rearward from 6.

Reference numerals 44 and 44 'denote adapter members, which are attached to the rear ends of the reflecting portions 20 and 21, respectively. still,
Since these adapter members have the same structure, only the member 44 relating to the passing beam light bulb 38 will be described, and the other member 44 ′ will be given the same reference numerals as those applied to the member 44. The description is omitted.

The adapter member 44 has connector portions 45, 45 into which the contact piece 43 of the light bulb 38 and the rear end portion of the base portion 39a are separately inserted.
Contact pieces 45a, 45a forming a part of 45 are projected rearward from the rear end face. The adapter member 44 is
It is attached to the rear end of the reflecting portion 21 by means not shown so as to cover the portion near the rear end of the base portion 39.

Reference numerals 46 and 46 'denote caps for holding the adapter member 44, which are attached to the rear ends of the portions 2A and 2B of the lamp body 2, respectively. Since these caps 46 and 46 'have the same structure, only the cap 46 relating to the passing beam light bulb 38 will be described, and the other cap 46' has a cap 4 for each part.
The description is omitted by assigning the same reference numerals to the reference numerals assigned to 6.

The cap 46 is composed of a rubber socket cover 47 and a ring-shaped lock ring 48 made of synthetic resin.

The socket cover 47 comprises a holding portion 47a for holding the adapter member 44 and a body portion 47b attached to the lock ring 48, which are connected by a thin bellows portion. When attaching the cap 46 to the lamp body 2, first, the body portion 47b is attached to the lock ring 48, and then the front end portion of the lock ring 48 is fitted into the opening 13 of the lamp body 2 and the front end portion of the lock ring 48 is attached. The locking portions 48a, 48a, ... Formed in the above are inserted into notches (not shown) formed continuously with the opening 13 of the lamp body 2, and then the lock ring 48 is rotated. As a result, the front end of the lock ring 48 is fitted in the opening 13 of the lamp body 2 and the cap 46 is attached to the rear end of the lamp body 2B.

In the headlight 1, however, the reflector 2
By forming the ventilation holes 30 and 31 in the lamp chamber 1,
Since 9 and the outside thereof are communicated with each other, convection occurs in the lamp chamber 29 when the light bulb 38 is turned on, and air flows into and out of the accommodation space 4b through the ventilation holes 30 and 31. That is, air flows from the outside of the lamp chamber 29 into the lamp chamber 29 through the ventilation hole 31, and the warmed air passes through the ventilation hole 30 and the lamp chamber 2
The heat in the lamp chamber 29 can be dissipated to the outside.

In the above embodiment, the ventilation holes 30,
Although the example in which 31 is formed in the effective reflection portion 21a is shown, the invention is not limited to this, and for example, as shown in the vehicle lamp 1A of FIG.
It may be formed on the upper surface portion 23 and the bottom surface portion 25, respectively. In short, the reflection part 21 is arranged so that heat is not trapped in the lamp room 29.
Vents may be formed in the.

[0032]

As is apparent from the above description, according to the present invention, a light chamber is defined by a reflecting mirror and an inner lens by forming a ventilation hole above and below the light source. The heat inside the lamp chamber can be dissipated outside the lamp chamber by positively forming an air flow between the outside and the outside, reducing the fogging of the inner lens and the disturbance of the light distribution, and the thermal deformation of the reflecting mirror. Can be prevented.

[Brief description of drawings]

1 shows an example in which the present invention is applied to a vehicle headlight together with FIG. 2 to FIG. 5, and this figure is a front view.

FIG. 2 is a sectional view taken along line II-II in FIG.

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

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

FIG. 5 is an enlarged rear view partially showing a reflecting portion of the reflecting mirror related to the low beam.

FIG. 6 is a vertical sectional view showing a modified example.

FIG. 7 is a vertical cross-sectional view showing an example of a conventional vehicle lamp.

[Explanation of symbols]

 1 Headlight (vehicle lamp) 2 Lamp body 19 Reflector 27 Inner lens 29 Lamp room 30, 31 Vent 38 Light bulb (light source) 1A Vehicle lamp 30A, 31A Vent

Claims (1)

[Claims] 1. A vehicular lamp having a reflecting mirror and an inner lens arranged in a lamp body, wherein a light source is arranged in a lamp chamber defined by the reflecting mirror and the inner lens. A vehicular lamp characterized in that ventilation holes are formed in upper and lower portions with a light source interposed therebetween.