JP2007188758A - Vehicular headlight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular headlight in which the length in the optical axial direction can be shortened by further bringing the tip part of a light source bulb closer to a projection lens. <P>SOLUTION: The vehicular headlight 30 is provided with the projection lens 18 arranged on an optical axis Ax extending in the vehicular front and rear direction, the light source bulb 12 arranged backward from the projection lens 18, and a reflector 14 for reflecting light from this light source bulb 12 toward the vicinity of the rear-side focal point F2 of the projection lens 18. The tip part 12b of the light source bulb 12 is positioned forward from the rear-side focal point F2 of the projection lens 18, and arranged so as to be inclined directed downward in order not to enter into an effective range U of the projection lens 18. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a so-called projector-type vehicle headlamp, and more particularly to an improvement for shortening the total length of the headlamp along the optical axis direction.

  In general, a projector-type vehicle headlamp is provided with a projection lens arranged on an optical axis extending in the vehicle front-rear direction, a light source bulb arranged behind the projection lens, and behind the light source bulb. And a reflector that reflects the light from the light source bulb toward the vicinity of the rear focal point of the projection lens.

  When this projector-type vehicle headlamp is configured for low beam irradiation, a shade that shields part of the reflected light from the reflector between the projection lens and the light source bulb and removes the upward irradiation light. By providing this, beam irradiation is performed forward with a low beam light distribution pattern having a predetermined cut-off line.

Such projector-type vehicle headlamps are roughly classified into a lateral insertion type and a rear insertion type depending on the light source bulb mounting structure.
In the side insertion type, the light source bulb is inserted and fixed from the side of the reflector to the inside of the reflector with the bulb axis in the width direction of the vehicle (see, for example, Patent Document 1). In the rear insertion type, the light source bulb is inserted and fixed from the rear side of the reflector to the inside of the reflector with the bulb axis in the front-rear direction of the vehicle (see, for example, Patent Document 2).
The side insertion type is suitable for shortening the length of the vehicle headlamp in the optical axis direction, but on the other hand, there are inconveniences such as difficult replacement of the bulb, and in general, the replacement of the bulb is easy. The rear insertion type is the mainstream.

JP 2004-127830 A JP 11-329008 A

  By the way, in the case of the rear insertion type, in order to shorten the length of the vehicle headlamp in the optical axis direction, it is desirable to arrange the light source bulb as close to the projection lens as possible. However, in order to obtain a light distribution pattern for low beam irradiation, when a shade that removes upward illumination light is provided near the rear focal point of the projection lens, the shade becomes an obstacle, and the conventional one is equipped with a shade. The limit is that the tip of the light source bulb is placed close to the rear focal point of the projection lens to be used, and no further shortening has been possible.

  Accordingly, an object of the present invention is to solve the above-described problems, and is a rear insertion type projector-type vehicle headlamp, in which the tip of the light source bulb is further brought closer to the projection lens and the length in the optical axis direction is increased. It is providing the vehicle headlamp which can shorten this length.

The above object of the present invention is to provide a projection lens disposed on an optical axis extending in the vehicle front-rear direction, a light source bulb disposed behind the projection lens, and light from the light source bulb on the rear side of the projection lens. A vehicle headlamp comprising a reflector that reflects toward the vicinity of the focal point;
The light source bulb is achieved by a vehicular headlamp characterized in that a tip portion is positioned before a rear focal point of the projection lens and is disposed so as not to fall within an effective range of the projection lens. The

  According to the above configuration, the front end of the light source bulb is located behind the projection lens as compared with the conventional vehicle headlamp in which the front end of the light source bulb is set behind the rear focal point of the projection lens. The separation distance between the projection lens and the light source bulb is shortened by an amount set before the side focal point, and the total length of the headlamp along the optical axis direction can be shortened.

Preferably, in the vehicle headlamp configured as described above, the reflector may be provided at a position that covers at least the opposite side of the light source of the light source bulb across the optical axis.
With such a configuration, for example, when the light source of the light source bulb is disposed below the optical axis, the reflector is disposed above the optical axis, and when the light source bulb is offset from the optical axis, The position of the reflector can be further prevented from moving away from the optical axis, and as a result, the headlamp can be prevented from becoming large in the direction orthogonal to the optical axis.

Preferably, in the vehicle headlamp configured as described above, the light source bulb may be inserted and fixed from the rear side of the reflector so that a bulb center axis does not coincide with the optical axis.
With such a configuration, for example, the shade that removes the upward irradiation light is equipped with a front-falling inclination state so that the reflected light of the reflector is along the lower boundary of the effective range of the lens that enters the projection lens. In this case, the tip of the light source bulb that is mounted with the bulb center axis shifted below the optical axis is inserted under the shade so that the tip of the light source bulb is positioned in front of the rear focal point of the projection lens. The total length of the headlamp along the optical axis direction can be shortened by shortening the separation distance between the projection lens and the light source bulb.

The effective range of the projection lens is a cone-shaped range having the rear surface of the projection lens as the bottom surface and the rear focus of the projection lens as the apex. Is placed, the light that has passed through the projection lens becomes parallel light.
The tip of the light source bulb is the end of the light source bulb that is on the opposite side of the plug from the light source. For example, in the case of a discharge bulb, it is the tip of a metal lead support. Is the tip of the glass portion.
Further, since the light source bulb is attached to the reflector as a rear insertion type, the bulb can be easily replaced.

Preferably, in the vehicular headlamp configured as described above, the light source bulb may be arranged such that a tip portion thereof is inclined downward.
With such a configuration, the effective range of the lens on which the reflected light of the reflector enters the projection lens is a cone shape with the rear surface of the projection lens as the bottom surface and the rear focus of the projection lens as the apex. Since the bulbs are arranged with the tip inclined downward, the shades and light source bulbs can be arranged at high density along the lower boundary in the effective range of the projection lens. Can be efficiently brought close to the projection lens.
Further, in the configuration in which the tip portion is tilted downward and embedded in the shade, the direct light from the light source of the light source bulb toward the projection lens can be cut by the shade, so that the occurrence of glare can be reduced.

Preferably, in the vehicle headlamp configured as described above, the light source bulb may be a discharge bulb arranged such that a tip portion thereof is directed downward and inclined at an angle of 15 degrees or less with respect to the optical axis.
When the light source bulb is a discharge bulb, if the inclination of the bulb is excessively increased, the life of the bulb is reduced.
However, if the inclination from the optical axis is limited as in the above-described configuration, it is possible to prevent a reduction in the life and improve durability as a vehicle headlamp.

Preferably, in the vehicle headlamp configured as described above, the additional reflector that reflects the light from the light source bulb toward the front of the vehicle is at a position where at least the reflected light from the reflector does not enter the projection lens. Thus, the light source bulb may be disposed at a position that covers the light source, away from the optical axis.
With such a configuration, when the light source bulb is tilted, even if the solid angle of the reflector facing the light source across the optical axis is reduced and the amount of light emitted from the reflector to the projection lens is reduced, the reflector is Since the additional reflector located on the same side as the light source bulb picks up the light emitted from the light source to the extent that it cannot be reflected by the projection lens and irradiates it to the front, the luminous efficiency of the headlamp is reduced. The irradiation performance can be improved by increasing the amount of light.

Moreover, it is preferable that a configuration is provided that includes a shade that extends obliquely downward to the front so as to follow the lower boundary of the effective range from the vicinity of the rear focal point of the projection lens.
With such a configuration, direct light traveling from the light source bulb to the projection lens can be cut by the shade, so that the occurrence of glare can be reduced. Further, when the shade is integrally formed by aluminum die casting or the like, the heat of the light source bulb can be radiated through the shade.

  According to the vehicle headlamp according to the present invention, the tip of the light source bulb is compared with the conventional vehicle headlamp in which the tip of the light source bulb is set behind the rear focal point of the projection lens. The distance between the projection lens and the light source bulb is shortened by the amount of the portion set before the rear focal point of the projection lens, and the total length of the headlamp along the optical axis direction can be shortened. .

Hereinafter, a vehicle headlamp according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a longitudinal sectional view of a vehicle headlamp according to a first embodiment of the present invention.

As shown in FIG. 1, the vehicle headlamp 30 according to the first embodiment includes an interior of a lamp chamber 33 formed by a lamp body 31 and a transparent transparent cover (cover) 32 attached to the front opening thereof. In addition, a projector-type lamp unit 35 is accommodated.
The lamp unit 35 is supported by the lamp body 31 via the aiming mechanism 40. The aiming mechanism 40 is a mechanism for finely adjusting the mounting position and the mounting angle of the lamp unit 35. At the stage of adjusting the aiming, the lens central axis (optical axis) Ax of the lamp unit 35 is 0 with respect to the vehicle longitudinal direction. It extends in the downward direction about 5 to 0.6 degrees.

  The projector-type lamp unit 35 includes a projection lens 18 disposed on an optical axis Ax extending in the vehicle longitudinal direction, a light source 12a disposed behind the projection lens 18, and direct light from the light source 12a forward. The reflector 14 which reflects toward the back side focus F2 vicinity of this projection lens 18 is provided, and the shade 43 arrange | positioned between the light source 12a and the projection lens 18 is comprised.

The light source 12 a is a light emitting unit of the light source bulb 12. In the present embodiment, the light source bulb 12 is a high-pressure discharge lamp (discharge bulb) such as a high-pressure sodium lamp, but a so-called H7 halogen bulb or the like can be adopted instead of the high-pressure discharge lamp.
In the case of the present embodiment, the light source bulb 12 has a distal end portion 12b, which is the distal end portion of the metal lead support, positioned in front of the rear focal point F2 of the projection lens 18 and enters the effective range U of the projection lens 18. The tip portion 12b is arranged so as to be inclined downward so as not to be present. The light source bulb 12 is inserted and fixed from the rear side of the reflector 14.
Therefore, as shown in the figure, the valve center axis Vx does not coincide with the optical axis Ax, and has an inclination angle of an angle θ downward with respect to the optical axis Ax. When the light source bulb 12 is a discharge bulb, the inclination angle θ of the bulb center axis Vx with respect to the optical axis Ax is preferably suppressed to an angle of 15 degrees or less.

  The effective range U of the projection lens 18 is a range in which the reflected light of the reflector 14 is incident on the projection lens 18, and has a conical shape with the rear surface 18a of the projection lens 18 as a bottom surface and the rear focal point F2 of the projection lens 18 as a vertex. (If a point light source is arranged at the rear focal point F2 of the projection lens 18, the light passing through the projection lens 18 becomes parallel light).

  The reflector 14 is provided at a position that covers at least the opposite side of the light source 12a across the optical axis Ax. The reflector 14 has a substantially elliptical reflecting surface 14a in which the position of the light source 12a is the first focal point F1, and the rear focal point F2 of the lens is the second focal point. As a result, the reflecting surface 14a reflects light from the light source 12a toward the front toward the optical axis Ax. At this time, the second focal point of the ellipse in the vertical cross section including the optical axis Ax. Is substantially converged to the rear focal point F2.

The projection lens 18 is coupled to the front end of the reflector 14 via a holder 41.
The projection lens 18 is a plano-convex lens having a convex front surface and a flat rear surface, and is disposed so that its rear focal point F2 substantially coincides with the second focal point of the reflecting surface 14a of the reflector 14. Thereby, the projection lens 18 transmits the reflected light from the reflecting surface 14a of the reflector 14 so as to be condensed toward the optical axis Ax.

The shade 43 has a shape extending diagonally forward and downward from the vicinity of the rear focal point F2 of the projection lens 18 along the lower boundary of the effective range U, and an upper end edge located in the vicinity of the rear focal point F2. However, a part of the reflected light of the reflector 14 is shielded to form a horizontal cut-off line of the light distribution pattern.
The shade 43 is fixed integrally with the holder 41, blocks between the light source 12a and the effective range U of the lens, and prevents direct light from the light source 12a from entering the projection lens 18, Prevents glare from occurring. In addition, by integrally forming the shade 43 located in the vicinity of the light source bulb 12 by aluminum die casting or the like, heat from the light source bulb 12 can be transmitted from the shade 43 to the holder 41, and a heat radiation effect can be obtained. .

  Therefore, the front end portion 12b of the light source bulb 12 inserted and fixed from the rear side of the reflector 14 sinks below the shade 43, so that the front end portion 12b can be positioned in front of the rear focus F2 of the projection lens 18. In addition, since the separation distance between the projection lens 18 and the light source bulb 12 is shortened, the total length of the headlamp along the optical axis Ax direction can be shortened.

  That is, according to the vehicle headlamp 30 of the first embodiment described above, the conventional vehicle headlamp in which the front end portion of the light source bulb is set behind the rear focus F2 of the projection lens 18 is used. In comparison with the above, the distance between the projection lens 18 and the light source bulb 12 is shortened by the amount that the front end portion 12b of the light source bulb 12 is set before the rear focal point F2 of the projection lens 18. The total length of the headlamp along the axis Ax direction can be shortened.

Further, in the case of the vehicle headlamp 30 of the present embodiment, the reflector 14 is provided at a position that covers at least the optical axis Ax that is the central axis of the lens and covers the opposite side of the light source 12a. When the light source 12a is disposed below the optical axis Ax, the reflector 14 is disposed above the optical axis Ax. When the light source bulb 12 is offset from the optical axis Ax, the position of the reflector 14 is accordingly increased. Further, it is possible to prevent the headlamp from being separated from the optical axis Ax, and as a result, it is possible to prevent the headlamp from becoming large in the direction orthogonal to the optical axis Ax.
Further, since the light source bulb 12 is attached to the reflector 14 in a rear insertion type, the bulb can be easily replaced.

  Further, the effective range U of the lens through which the reflected light of the reflector 14 enters the projection lens 18 has a conical shape with the rear surface 18a of the projection lens 18 as a bottom surface and the rear focal point F2 of the projection lens 18 as a vertex. As in the above-described embodiment, the light source bulb 12 is disposed with the tip portion 12b tilted downward, so that the shade 43 and the light source bulb 12 are arranged along the lower boundary in the effective range U of the projection lens 18. It becomes possible to arrange them at high density, and the light source bulb 12 can be brought close to the projection lens 18 efficiently.

Furthermore, in the configuration in which the tip end portion 12b is tilted downward and is submerged under the shade 43, direct light from the light source 12a of the light source bulb 12 toward the projection lens 18 can be cut by the shade 43, thereby reducing the occurrence of glare. Can do.
Further, when the light source bulb 12 is a discharge bulb, if the bulb inclination is excessively increased, the lifetime may be reduced. However, the inclination angle θ from the optical axis Ax is set to 15 ° or less as in the above configuration. If it restrict | limits, the lifetime reduction of the vehicle headlamp 30 can be prevented.

FIG. 2 shows a lamp unit of a vehicle headlamp according to a second embodiment of the present invention. In addition, about the component similar to the said 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
As shown in FIG. 2, the projector-type lamp unit 55 according to the second embodiment is disposed behind the projection lens 18 disposed on the optical axis Ax extending in the vehicle front-rear direction and the projection lens 18. A light source 12a, a reflector 14 that reflects direct light from the light source 12a toward the vicinity of the rear focal point F2 of the front projection lens 18, and a shade 43 disposed between the light source 12a and the projection lens 18. It has.

In the case of the present embodiment, the light source bulb 12 is arranged such that the bulb center axis Vx is substantially parallel to the optical axis Ax of the projection lens 18 and is appropriately offset by a distance L downward from the optical axis Ax. The light source bulb 12 is also inserted and fixed from the rear side of the reflector 14.
Therefore, the projector-type lamp unit 55 according to the second embodiment can also position the front end portion 12b of the light source bulb 12 in front of the rear focal point F2 of the lens. The total distance of the headlamps along the direction of the optical axis Ax can be shortened.
Further, since the light source bulb 12 is arranged to be offset downward, the space between the light source bulb 12 and the upper wall (the upper inner wall of the holder 41 and the reflector 14) is widened, and the convection area is widened. The effect of heat dissipation is increased.

FIG. 3 shows a lamp unit for a vehicle headlamp according to a third embodiment of the present invention. In addition, about the component similar to the said 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
As shown in FIG. 3, the projector-type lamp unit 65 according to the third embodiment includes a projection lens 18 disposed on an optical axis Ax extending in the vehicle front-rear direction and a rear side of the projection lens 18. A light source 12a, a reflector 14 that reflects direct light from the light source 12a toward the vicinity of the rear focal point F2 of the front projection lens 18, and a shade 43 disposed between the light source 12a and the projection lens 18. It has.

  In the present embodiment, the light source bulb 12 is in a state in which the bulb center axis Vx is inclined with respect to the optical axis Ax of the lens by lowering the distal end portion 12b of the light source bulb 12, and the reflector 14 The position of the light source 12a of the light source bulb 12 that becomes the one focus F1 is set in the vicinity of the optical axis Ax.

Therefore, the projector-type lamp unit 65 according to the third embodiment can also position the front end portion 12b of the light source bulb 12 in front of the rear focal point F2 of the lens. The total distance of the headlamps along the direction of the optical axis Ax can be shortened.
In the present embodiment, since the light source 12a of the light source bulb 12 is provided in the vicinity of the optical axis Ax, when the light source bulb 12 is offset from the optical axis Ax, the light source 12a moves away from the reflector 14 accordingly. As a result, a decrease in the amount of light incident on the projection lens 18 can be reduced.

FIG. 4 shows a vehicle headlamp according to a fourth embodiment of the present invention.
As shown in FIG. 4, the vehicle headlamp 70 of the fourth embodiment includes a projector in a lamp chamber 73 formed by a lamp body 71 and a transparent transparent cover 72 attached to the front opening thereof. A type of lamp unit 75 is accommodated.

  The lamp unit 75 supported by the lamp body 71 via the aiming mechanism 40 includes a projection lens 18 disposed on an optical axis Ax extending in the vehicle front-rear direction, and a light source 12a disposed behind the projection lens 18. A reflector 74 that reflects the direct light from the light source 12a toward the vicinity of the rear focal point F2 of the front projection lens 18, a shade 84 disposed between the light source 12a and the projection lens 18, and the light source bulb 12. And an additional reflector 76 that reflects light from the vehicle toward the front of the vehicle.

In the case of the present embodiment, the light source bulb 12 has the front end portion 12b positioned in front of the rear focal point F2 of the projection lens 18 and the front end portion 12b below the effective range U of the projection lens 18. It is arranged so as to incline toward. The light source bulb 12 is inserted and fixed from the rear side of the reflector 74.
Therefore, as shown in the figure, the valve center axis Vx does not coincide with the optical axis Ax, and has an inclination angle of an angle θ downward with respect to the optical axis Ax. When the light source bulb 12 is a discharge bulb, the inclination angle θ of the bulb center axis Vx with respect to the optical axis Ax is preferably suppressed to an angle of 15 degrees or less.

  The reflector 74 is provided at a position that covers at least the opposite side of the light source 12a across the optical axis Ax. The reflector 74 has a substantially elliptical reflecting surface 74a in which the position of the light source 12a is the first focal point F1, and the rear focal point F2 of the lens is the second focal point. Thereby, the reflection surface 74a reflects light from the light source 12a forward and close to the optical axis Ax, and in this case, the second focal point of the ellipse in the vertical section including the optical axis Ax. Is substantially converged to the rear focal point F2.

As shown in FIG. 4, the additional reflector 76 is at a position where at least the reflected light from the reflector 74 does not enter the projection lens 18 and covers the light source 12 a of the light source bulb 12, away from the optical axis Ax. Has been placed.
In other words, the additional reflector 76 provides a reflective surface 76a that is continuous with the reflective surface 74a of the reflector 74 on the same side as the light source 12a with respect to the optical axis Ax.
Therefore, the additional reflector 76 is arranged in a parbola shape in the vehicle body width direction around the light source 12a, and forms the irradiation light B that irradiates the front at a position away from the projection lens 18 downward.

The projection lens 18 is coupled to the front ends of the reflector 14 and the additional reflector 76 via a holder 81.
The projection lens 18 is a plano-convex lens having a convex front surface and a flat rear surface, and is disposed such that its rear focal point F2 substantially coincides with the second focal point of the reflecting surface 74a of the reflector 74. Thereby, the projection lens 18 transmits the reflected light from the reflecting surface 74a of the reflector 74 so as to be condensed toward the optical axis Ax.

The shade 84 has a shape extending obliquely downward and forward from the vicinity of the rear focal point F2 of the projection lens 18 along the lower boundary of the effective range U, and is an upper end edge located in the vicinity of the rear focal point F2. However, a part of the reflected light of the reflector 74 is shielded to form a horizontal cut-off line of the light distribution pattern.
The shade 84 is fixed integrally with the holder 81, blocks between the light source 12a and the effective range U of the lens, and prevents direct light from the light source 12a from entering the projection lens 18, Prevents glare from occurring. In addition, by integrally forming the shade 84 located in the vicinity of the light source bulb 12 by aluminum die casting or the like, heat from the light source bulb 12 can be transmitted from the shade 84 to the holder 81, and a heat radiation effect can be obtained. .

  Therefore, the front end portion 12b of the light source bulb 12 inserted and fixed from the rear side of the reflector 74 and the additional reflector 76 sinks below the shade 84, so that the front end portion 12b is in front of the rear focus F2 of the projection lens 18. The total length of the headlamp along the optical axis Ax direction can be shortened by shortening the separation distance between the projection lens 18 and the light source bulb 12.

  That is, according to the vehicle headlamp 70 of the fourth embodiment described above, the conventional vehicle headlamp in which the tip portion of the light source bulb is set behind the rear-side focal point F2 of the projection lens 18. In comparison with the above, the distance between the projection lens 18 and the light source bulb 12 is shortened by the amount that the front end portion 12b of the light source bulb 12 is set before the rear focal point F2 of the projection lens 18. The total length of the headlamp along the axis Ax direction can be shortened.

  Further, in the vehicle headlamp 70 of the present embodiment, when the light source bulb 12 is tilted, the solid angle of the reflector 74 facing the light source 12a across the optical axis Ax becomes small, and the reflector 74 projects the projection lens 18. Even when the amount of light incident on the light source 12 decreases, the additional reflector 76 that positions the light emitted from the light source 12a within the range in which the reflector 74 cannot reflect the projection lens 18 on the same side as the light source bulb 12 with respect to the optical axis Ax. Picked up and used as irradiation light B forward. Therefore, as the headlamp, the light beam utilization efficiency can be improved, and the irradiation performance can be improved by increasing the amount of light.

FIG. 5 shows a lamp unit for a vehicle headlamp according to a fifth embodiment of the present invention. In addition, about the component similar to the said 4th Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
As shown in FIG. 5, the projector-type lamp unit 85 according to the fifth embodiment includes a projection lens 18 disposed on an optical axis Ax extending in the vehicle front-rear direction and a rear side of the projection lens 18. A light source 12a, a reflector 74 that reflects the direct light from the light source 12a toward the vicinity of the rear focal point F2 of the front projection lens 18, and a shade 84 disposed between the light source 12a and the projection lens 18. And an additional reflector 76 that reflects light from the light source bulb 12 toward the front of the vehicle.

In the case of the present embodiment, the light source bulb 12 is arranged such that the bulb center axis Vx is substantially parallel to the optical axis Ax of the projection lens 18 and is appropriately offset by a distance L downward from the optical axis Ax. The light source bulb 12 is also inserted and fixed from the rear side of the reflector 74 and the additional reflector 76.
Further, the additional reflector 76 provides a reflection surface 76a that is continuous with the reflection surface 74a of the reflector 74 on the same side as the light source 12a with respect to the optical axis Ax. Irradiation light B is provided on the mold and irradiates the front at a position away from the projection lens 18 downward.

Therefore, the projector-type lamp unit 85 according to the fifth embodiment can also position the front end portion 12b of the light source bulb 12 in front of the rear focal point F2 of the lens. The total distance of the headlamps along the direction of the optical axis Ax can be shortened.
Further, since the light source bulb 12 is arranged to be offset downward, the space between the light source bulb 12 and the upper wall (the upper inner wall of the holder 81 and the reflector 74) is widened, and the convection area is widened. The effect of heat dissipation is increased.
Further, the additional reflector 76 located on the same side as the light source bulb 12 with respect to the optical axis Ax picks up the light emitted from the light source 12a within a range where the reflector 74 cannot reflect the projection lens 18, and makes the light B emitted forward. Therefore, as a headlamp, the light beam utilization efficiency can be improved, and the irradiation performance can be improved by increasing the amount of light.

FIG. 6 shows a lamp unit for a vehicle headlamp according to a sixth embodiment of the present invention. In addition, about the component similar to the said 4th Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.
As shown in FIG. 6, the projector-type lamp unit 95 according to the sixth embodiment is disposed on the rear side of the projection lens 18 disposed on the optical axis Ax extending in the vehicle front-rear direction. A light source 12a, a reflector 74 that reflects the direct light from the light source 12a toward the vicinity of the rear focal point F2 of the front projection lens 18, and a shade 84 disposed between the light source 12a and the projection lens 18. And an additional reflector 76 that reflects light from the light source bulb 12 toward the front of the vehicle.

  In the case of the present embodiment, the light source bulb 12 is in a state where the bulb center axis Vx is inclined with respect to the optical axis Ax of the lens by lowering the front end portion 12b of the light source bulb 12, and the reflector 74 The position of the light source 12a of the light source bulb 12 that becomes the one focus F1 is set in the vicinity of the optical axis Ax.

Therefore, the projector-type lamp unit 95 according to the sixth embodiment can also position the front end portion 12b of the light source bulb 12 in front of the rear focal point F2 of the lens, and the projection lens 18, the light source bulb 12, and the like. The total distance of the headlamps along the direction of the optical axis Ax can be shortened.
In the present embodiment, since the light source 12a of the light source bulb 12 is provided in the vicinity of the optical axis Ax, when the light source bulb 12 is offset from the optical axis Ax, the light source 12a moves away from the reflector 74 accordingly. As a result, a decrease in the amount of light incident on the projection lens 18 from the reflector 74 can be reduced.

  Note that the configurations of the projection lens, light source, reflector, shade, additional reflector, and the like in the vehicle headlamp of the present invention are not limited to the configurations of the above-described embodiments, and various configurations can be made based on the gist of the present invention. It goes without saying that forms can be taken.

It is a longitudinal cross-sectional view of the vehicle headlamp which concerns on 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the lamp unit of the vehicle headlamp which concerns on 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows the lamp unit of the vehicle headlamp which concerns on 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the vehicle headlamp which concerns on 4th Embodiment of this invention. It is a longitudinal cross-sectional view which shows the lamp unit of the vehicle headlamp which concerns on 5th Embodiment of this invention. It is a longitudinal cross-sectional view which shows the lamp unit of the vehicle headlamp which concerns on 6th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 Light source bulb 12a Light source 12b Tip part 14 Reflector 14a Reflecting surface 18 Projection lens 30 Vehicle headlamp 31 Lamp body 32 Transparent cover (cover)
33 Light room 35 Lamp unit 43 Shade

Claims (7)

A projection lens disposed on an optical axis extending in the vehicle front-rear direction, a light source bulb disposed behind the projection lens, and light from the light source bulb is reflected toward the rear focal point of the projection lens. A vehicle headlamp comprising a reflector,
The vehicle light source, wherein the light source bulb is disposed so that a tip portion thereof is positioned before a rear focal point of the projection lens and does not enter an effective range of the projection lens.   The vehicle headlamp according to claim 1, wherein the reflector is provided at a position that covers at least the opposite side of the light source of the light source bulb with the optical axis interposed therebetween.   The vehicle headlamp according to claim 1 or 2, wherein the light source bulb is inserted and fixed from a rear side of the reflector so that a bulb central axis does not coincide with the optical axis.   The vehicular headlamp according to any one of claims 1 to 3, wherein the light source bulb is disposed such that a tip portion thereof is inclined downward.   5. The vehicle headlamp according to claim 4, wherein the light source bulb is a discharge bulb arranged such that a tip portion thereof faces downward and is inclined at an angle of 15 degrees or less with respect to the optical axis.   The additional reflector that reflects the light from the light source bulb toward the front of the vehicle is at least a position where the reflected light from the reflector does not enter the projection lens and covers the light source of the light source bulb. The vehicular headlamp according to any one of claims 1 to 5, wherein the vehicular headlamp is disposed away from the vehicle headlight. The shade according to any one of claims 1 to 6, further comprising a shade extending diagonally forward and downward along the lower boundary of the effective range from the vicinity of the rear focal point of the projection lens. Vehicle headlamp.

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