JP2009245620A - Vehicular lighting fixture - Google Patents

Abstract

A vehicular lamp capable of further improving the utilization efficiency of irradiation light emitted from a light source bulb is provided.
In a vehicular lamp including a reflector having an opening into which a light source bulb is inserted and a light source bulb that is inclined downward by a predetermined angle with respect to a horizontal plane and is attached to the reflector, in a longitudinal direction of the light source bulb On the other hand, a pair of left and right reflecting surfaces arranged on both the left and right sides, an elliptical reflecting surface that reflects the irradiation light emitted from the light source bulb to form a predetermined light distribution pattern, as an elliptical reflecting surface Each of the pair of left and right reflecting surfaces includes an inclined plane inclined downward by a predetermined angle with respect to a horizontal plane, a plurality of elliptical arc-shaped reflecting surfaces appearing on a cut surface formed by a plane parallel to the inclined plane, and a cut surface formed by the inclined plane. It is constituted by a plurality of parabolic reflecting surfaces appearing on a cut surface by a vertical surface including a virtual ray from a light source bulb reflected by an appearing elliptical arc-shaped reflecting surface.
[Selection] Figure 1

Description

  The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp that can improve the utilization efficiency of irradiation light emitted from a light source bulb.

  Conventionally, in the field of vehicular lamps, in order to improve the utilization efficiency of irradiation light emitted from a light source bulb, a plurality of reflections disposed behind, in front of, and laterally of the light source bulb so as to cover the light source bulb. A vehicular lamp using a surface has been proposed (see, for example, Patent Document 1).

  FIG. 11 is a cross-sectional view of the vehicular lamp described in Patent Document 1 cut along a horizontal plane including the lamp optical axis AX.

As shown in FIG. 11, the vehicular lamp described in Patent Document 1 has an opening 11 ′ into which a light source bulb (not shown) is inserted, and is disposed behind the light source bulb so as to cover the light source bulb. Reflector 10 '(rear reflecting surface 10') and reflector 20 'disposed in front of the light source bulb so as to cover the light source bulb (four arranged respectively in the upper right, lower right, upper left and lower left of the light source bulb). Four front reflective surfaces 20R _U ′, 20R _L ′, 20L _U ′, 20L _L ′) and four side reflective surfaces arranged on both sides of the light source bulb (upper left, lower left, upper right and lower right of both sides of the light source bulb). 30R _U ′, 30R _L ′, 30L _U ′, and 30L _L ′.

In the vehicular lamp described in Patent Document 1, of the light emitted from the light source bulb, the light emitted to the front of the light source bulb is divided into four front reflecting surfaces 20R _U ′, 20R _L ′, and 20L _U. ′, 20L _L ′ and the four side reflecting surfaces 30R _U ′, 30R _L ′, 30L _U ′, 30L _L ′ are reflected and irradiated forward.

Further, in the vehicular lamp described in Patent Document 1, of the irradiation light from the light source bulb, the irradiation light irradiated to the rear of the light source bulb is reflected by the rear reflecting surface 10 'and reflected by the reflector 20'. The light passes through the opening 21 ′ formed at the center of the four front reflective surfaces 20 </ b> R _U ′, 20 </ b> R _L ′, 20 </ b> L _U ′, and 20 </ b> L _L ′, and is irradiated forward.
JP 2006-324101 A

However, in the vehicular lamp described in Patent Document 1, the opening 21 ′ formed at the center of the reflector 20 ′ (four front reflecting surfaces 20 </ b> R _U ′, 20 </ b> R _L ′, 20 </ b> L _U ′, 20 </ b> L _L ′). The reflection areas of the four front reflection surfaces are reduced, and the reflected light from the four front reflection surfaces toward the side reflection surfaces 30R _U ′, 30R _L ′, 30L _U ′, 30L _L ′ is reduced, and the light source bulb There is a problem that the utilization efficiency of the irradiation light from is reduced.

  This invention is made | formed in view of such a situation, and it aims at providing the vehicle lamp which can further improve the utilization efficiency of the irradiation light irradiated from a light source bulb.

  In order to solve the above-described problem, the invention described in claim 1 includes a reflector in which an opening into which a light source bulb is inserted is formed, and a lamp optical axis that is inserted into the opening and is inclined downward by a predetermined angle from a horizontal plane. And a light source bulb mounted on the reflector in a state in which the longitudinal directions thereof coincide with each other. The reflector includes at least the side of the light source bulb on each of the left and right sides with respect to the longitudinal direction of the light source bulb. A pair of left and right reflecting surfaces arranged to cover a range from the rear to the rear, and each of the pair of left and right reflecting surfaces is irradiated from the light source bulb to at least a range from the side of the light source bulb to the rear. An elliptical reflecting surface that reflects the irradiated light and forms a predetermined light distribution pattern, and is a focal line extending in the vertical direction inclined forward by a predetermined angle with respect to the vertical line Each of the pair of left and right reflecting surfaces as the ellipsoidal reflecting surface is set to have a plurality of elliptical circles appearing on a cutting plane formed by an inclined plane inclined downward by a predetermined angle with respect to a horizontal plane and a plane parallel to the inclined plane. Consists of an arc-shaped reflecting surface and a plurality of parabolic reflecting surfaces appearing on a cut surface by a vertical surface including virtual rays from the light source bulb reflected by an elliptical arc-shaped reflecting surface appearing on the cut surface by the inclined plane Each of the plurality of elliptical arc-shaped reflecting surfaces has a first focal point set in the vicinity of the light source bulb and a second focal point set on the focal line, and the plurality of parabolic reflecting surfaces. Each of the surfaces has a focal point set in the vicinity of the light source bulb, and an optical axis inclined downward by a predetermined angle from the horizontal plane.

  According to the first aspect of the present invention, the pair of left and right reflecting surfaces as the elliptical reflecting surfaces are configured with reference to a focal line extending in the vertical direction inclined forward by a predetermined angle with respect to the vertical line. Unlike the conventional rear reflecting surface, it gradually becomes concave as it goes upward in the vertical direction (or down in the vertical direction), and at least covers the entire range from the side of the light source bulb to the rear.

  Therefore, according to the first aspect of the present invention, the pair of left and right reflecting surfaces reflect the irradiation light irradiated from the light source bulb at least in the range from the side to the rear of the light source bulb with almost no remainder. It becomes possible.

  Therefore, according to the first aspect of the present invention, it is possible to further improve the utilization efficiency of the irradiation light emitted from the light source bulb.

  According to the first aspect of the present invention, the pair of left and right reflecting surfaces as the elliptical reflecting surfaces is configured with reference to a focal line extending in the vertical direction and inclined forward by a predetermined angle with respect to the vertical line. Therefore, the irradiation light irradiated from the light source bulb to at least the range from the side to the rear of the light source bulb is reflected so as to be diffused in parallel and in the horizontal direction with respect to the inclined plane.

  Thus, according to the first aspect of the present invention, the upper end line is substantially parallel to the horizontal line and the upper end line is at a predetermined angle from the horizontal line (focal line with respect to the vertical line) on the vertical screen arranged at a predetermined position in front. It is possible to form a predetermined uniform light distribution pattern that is located at a position below (the same angle as the inclination angle).

  The position where the predetermined light distribution pattern is formed can be adjusted by adjusting the tilt angle of the focal line with respect to the vertical line.

  Since the conventional rear reflection surface has an opening into which the light source bulb is inserted, the light distribution pattern from the rear reflection surface has a dark portion at the center of the light distribution pattern (almost in front of the vehicle). Appears and unevenness becomes conspicuous.

  However, according to the first aspect of the present invention, the opening into which the light source bulb is inserted is not the center of the rear reflecting surface as in the prior art, but between the right reflecting surface and the left reflecting surface, that is, a pair of left and right reflecting surfaces. It is formed at the end of each surface.

  Therefore, according to the first aspect of the present invention, in the light distribution pattern from the pair of left and right reflecting surfaces, a dark portion appears at the end of the light distribution pattern, and no unevenness appears in front of the vehicle. . Further, the light distribution patterns from the pair of left and right reflecting surfaces are overlapped.

  Therefore, compared with the conventional case where an opening into which the light source bulb is inserted is formed at the center of the rear reflecting surface, it is possible to prevent or reduce the occurrence of uneven light distribution due to the lack of irradiation light from the light source bulb. It becomes possible.

  According to a second aspect of the present invention, the longitudinal direction is made to coincide with the first reflector formed with an opening into which the light source bulb is inserted, and the lamp optical axis inserted into the opening and inclined downward by a predetermined angle from the horizontal plane. A light source bulb mounted on the first reflector in a state, a second reflector having four elliptical reflecting surfaces and disposed in front of the light source bulb so as to cover the front of the light source bulb, and the light source bulb Four parabolic reflecting surfaces disposed on both sides with respect to the longitudinal direction of each of the four elliptical reflecting surfaces, and each of the four elliptical reflecting surfaces corresponds to the irradiation light emitted from the light source bulb to the front of the light source bulb. A reflecting surface that reflects toward the parabolic reflecting surface, wherein a first focal point is set in the vicinity of the light source bulb, and a second focal point is set between the corresponding parabolic reflecting surface. The four releases Each of the system reflection surfaces is a reflection surface that reflects the reflected light from the corresponding elliptical reflection surface and forms a first light distribution pattern, and the focal point is the second focal point of the corresponding elliptical reflection surface. In the vehicular lamp set to the above, the first reflector is a pair of left and right arranged to cover at least the range from the side of the light source bulb to the rear on both the left and right sides with respect to the longitudinal direction of the light source bulb. Each of the pair of left and right reflective surfaces reflects light emitted from the light source bulb to at least a range from the side of the light source bulb to the rear, and is superimposed on the first light distribution pattern. An elliptical reflecting surface that forms a second light distribution pattern, and is forward of a predetermined angle with respect to a vertical line between the first reflector and the second reflector in the front view of the lamp. Inclined focal lines extending in the vertical direction are set, and each of the pair of left and right reflecting surfaces as the elliptical reflecting surfaces is an inclined plane inclined downward by a predetermined angle with respect to a horizontal plane and a plane parallel to the inclined plane A plurality of elliptical arc-shaped reflecting surfaces appearing on the cut surface due to and a vertical plane containing virtual rays from the light source bulb reflected by the elliptical arc-shaped reflecting surface appearing on the inclined plane. Each of the plurality of elliptical arc-shaped reflection surfaces has a first focal point set in the vicinity of the light source bulb and a second focal point set on the focal line. Each of the plurality of parabolic reflecting surfaces has a focal point set in the vicinity of the light source bulb and an optical axis inclined downward by a predetermined angle from a horizontal plane. To do.

  According to the second aspect of the present invention, the focal line extending in the vertical direction inclined forward by a predetermined angle with respect to the vertical line has the first reflector (a pair of left and right reflection surfaces) and the second reflector (four pairs of reflection surfaces) in front view of the lamp. Two elliptical reflecting surfaces).

  Therefore, according to the second aspect of the invention, the reflected light from the pair of left and right reflecting surfaces is between the first reflector (the pair of left and right reflecting surfaces) and the second reflector (the four elliptical reflecting surfaces). It will be irradiated through the space.

  In other words, according to the second aspect of the present invention, it is not necessary to form an opening in the second reflector (four elliptical reflecting surfaces, which corresponds to a conventional front reflecting surface).

  Therefore, according to the second aspect of the present invention, the reflection area of the four elliptical reflection surfaces (corresponding to the conventional front reflection surface) is increased as much as the opening is not formed. It is possible to improve the utilization efficiency of the irradiation light emitted from the light source bulb.

  According to the second aspect of the present invention, since it is not necessary to form an opening in the second reflector (four elliptical reflecting surfaces, which corresponds to a conventional front reflecting surface), the opening is not provided as in the prior art. Thus, glare caused by direct light from the light source bulb can be prevented.

  According to the second aspect of the present invention, the pair of left and right reflecting surfaces serving as the elliptical reflecting surfaces are configured with reference to a focal line extending in the vertical direction and inclined forward by a predetermined angle with respect to the vertical line. Therefore, unlike the conventional rear reflecting surface, it gradually becomes concave as it goes upward in the vertical direction (or down in the vertical direction), and at least covers the entire range from the side of the light source bulb to the rear.

  That is, according to the second aspect of the present invention, the light source bulb is substantially entirely covered by the first reflector (a pair of left and right reflecting surfaces) and the second reflector (four elliptical reflecting surfaces). Become.

  Therefore, according to the second aspect of the present invention, the irradiation light from the light source bulb (including the irradiation light irradiated to the range from the side to the rear of the light source bulb) can be reflected almost without leaving. It becomes possible.

  Therefore, according to the second aspect of the present invention, it is possible to further improve the utilization efficiency of the irradiation light emitted from the light source bulb.

  According to the second aspect of the present invention, the pair of left and right reflecting surfaces serving as the elliptical reflecting surfaces are configured with reference to a focal line extending in the vertical direction and inclined forward by a predetermined angle with respect to the vertical line. Therefore, the irradiation light irradiated from the light source bulb to at least the range from the side to the rear of the light source bulb is reflected so as to be diffused in parallel and in the horizontal direction with respect to the inclined plane.

  Thus, according to the second aspect of the present invention, the upper end line is substantially parallel to the horizontal line and the upper end line is at a predetermined angle from the horizontal line (focal line with respect to the vertical line) on the vertical screen arranged at a predetermined position in front. It is possible to form a predetermined uniform light distribution pattern that is located at a position below (the same angle as the inclination angle).

  The position where the predetermined light distribution pattern is formed can be adjusted by adjusting the tilt angle of the focal line with respect to the vertical line.

  Since the conventional rear reflection surface has an opening into which the light source bulb is inserted, the light distribution pattern from the rear reflection surface has a dark portion at the center of the light distribution pattern (almost in front of the vehicle). Appears and unevenness becomes conspicuous.

  However, according to the second aspect of the present invention, the opening into which the light source bulb is inserted is not the center of the rear reflecting surface as in the prior art, but between the right reflecting surface and the left reflecting surface, that is, a pair of left and right reflecting surfaces. It is formed at the end of each surface.

  Therefore, according to the second aspect of the present invention, in the light distribution pattern from the pair of left and right reflecting surfaces, a dark portion appears at the end of the light distribution pattern, and unevenness does not appear in front of the vehicle. . Further, the light distribution patterns from the pair of left and right reflecting surfaces are overlapped.

  Therefore, compared with the conventional case where an opening into which the light source bulb is inserted is formed at the center of the rear reflecting surface, it is possible to prevent or reduce the occurrence of uneven light distribution due to the lack of irradiation light from the light source bulb. It becomes possible.

  According to a third aspect of the present invention, in the second aspect of the present invention, the first reflector is a reflection reflected from each of the four elliptical reflecting surfaces toward the corresponding parabolic reflecting surface. Four openings for allowing light to pass through are formed, and the four openings connect the first focal point of the four elliptical reflecting surfaces and the second focal point of each of the four elliptical reflecting surfaces, and the four apertures. It is characterized by being formed on each of four straight lines that do not intersect with one parabolic reflecting surface.

  According to the invention described in claim 3, the four openings connect the first focal points of the four elliptical reflecting surfaces and the second focal points of the four elliptical reflecting surfaces, and the four parabolic reflecting surfaces. It is formed on each of four straight lines that do not intersect with each other, so that the direct light of the light source bulb passes through each aperture and prevents the generation of glare light that is incident on the four parabolic reflecting surfaces Is possible.

  According to the third aspect of the present invention, even if the height of the first reflector (the pair of left and right reflecting surfaces) in the vertical direction (vertical direction) is increased to increase the reflection area, four elliptical reflections The reflected light from each surface passes through the opening formed in the first reflector (a pair of left and right reflecting surfaces) without being blocked by the first reflector.

  That is, according to the third aspect of the invention, the height of the first reflector (the pair of left and right reflecting surfaces) in the vertical direction (vertical direction) is increased to reflect the first reflector (the pair of left and right reflecting surfaces). Since the area can be enlarged, the utilization efficiency of the irradiation light emitted from the light source bulb can be improved.

  The invention according to claim 4 is the invention according to claim 2 or 3, wherein each of the four elliptical reflecting surfaces includes the light source bulb leaking from an upper end portion or a lower end portion of each of the pair of left and right reflecting surfaces. A projection-like reflecting surface that closes the upper end portion or the lower end portion for reflecting the irradiation light toward the parabolic reflecting surface is formed.

  According to the fourth aspect of the present invention, it is possible to capture and reflect all the light emitted from the light source bulb without leaving the projection-like reflecting surface. That is, according to the fourth aspect of the present invention, it is possible to further improve the utilization efficiency of the irradiation light emitted from the light source bulb.

  According to a fifth aspect of the present invention, a plurality of parabolas appearing on a cut surface formed by the vertical surface, the reflecting surface portion below the inclined plane among the pair of left and right reflecting surfaces as the elliptical reflecting surface. A plurality of reflection surface portions above the inclined plane of the pair of left and right reflection surfaces as the elliptical reflection surface, which appear on a cut surface by the vertical surface. Each of the plurality of parabolic lower reflection surfaces has a focal point set in the vicinity of the front end at the lower end of the light source of the light source bulb, and is directed downward by a predetermined angle from the horizontal plane. An inclined optical axis is set, and each of the plurality of parabolic upper reflecting surfaces has a focal point set in the vicinity of the rear end of the light source of the light source bulb and is inclined downward by a predetermined angle from the horizontal plane. axis Characterized in that it is set.

  According to the invention described in claim 5, since the focal points are set in the vicinity of the lower end front end and the lower end rear end of the light source of the light source bulb on each of the pair of left and right reflecting surfaces, the projection of the light source of the light source bulb is performed. An image is projected in a desired posture, and a predetermined light distribution pattern having a clear cut-off line can be formed.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the vehicle lamp which can further improve the utilization efficiency of the irradiation light irradiated from a light source bulb.

  Hereinafter, a vehicular lamp that is an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view for explaining the main configuration of the vehicular lamp according to the present embodiment. FIG. 2 is a side view of the vehicular lamp shown in FIG.

The vehicular lamp 100 of this embodiment is applied to a headlamp such as a vehicle such as an automobile or a headlamp of a motorcycle, and a light source bulb 10 and a light source bulb 10 are inserted as shown in FIG. Reflectors 20 (a pair of left and right reflecting surfaces 22R and 22L), reflectors 30 (four elliptical reflecting surfaces 30R _U , 30L _U , 30R _L and 30L _L ) and four elliptical reflecting surfaces 30R _U. , 30L _U , 30R _L , 30L _L , four parabolic reflecting surfaces 40L _U , 40R _U , 40L _L , 40R _{L and the} like are provided.

[Configuration of Light Source Bulb 10]
As shown in FIG. 2, the light source bulb 10 is a bulb-type light source in which a light emission source 11 such as a filament or an arc is accommodated in a glass tube 12, and is, for example, an incandescent bulb, a halogen lamp, or an HID. The light source bulb 10 is inserted into the opening 21 formed in the reflector 20, and to match the longitudinal direction also alpha ° (e.g. 0.5 to 1.5 °) lamp optical axis AX inclined downward from the horizontal plane H _P It is attached to the reflector 20 in a state.

[Configuration of the reflector 20]
The reflector 20 is formed with an opening 21 into which the light source bulb 10 is inserted. As shown in FIGS. 1 and 5, at least from the side of the light source bulb 10 on both the left and right sides with respect to the longitudinal direction of the light source bulb 10. A pair of left and right reflecting surfaces 22R and 22L are provided so as to cover a rearward range (which may be a range from the front side to the side of the light source bulb 10 and to the rear side).

  Since the pair of left and right reflecting surfaces 22R and 22L have the same configuration, the reflecting surface 22R will be described below, and the description of the reflecting surface 22L will be omitted.

  The reflection surface 22R (the same applies to the reflection surface 22L) is an elliptical reflection surface that reflects the irradiation light irradiated from the light source bulb 10 to the range from the side of the light source bulb 10 to the rear thereof. 3, the light source bulb 10 is disposed so as to cover at least the range from the side to the rear.

The reflective surface 22R (reflecting surface 22L as well), a linear focal line _{F L} inclined alpha ° (e.g. 0.5 to 1.5 °) to the front with respect to the vertical line V is set. Figure 2 is an example of a linear focal line F _L set in the reflecting surface 22R (reflecting surface 22L as well). The linear focal line _{F L,} as shown in FIG. 1, the first reflector 20 (reflecting surface 22R) and the reflector 30 when viewed from the lamp front (four elliptic reflecting surfaces _{30U R, 30U L, 30D R} , 30D _L ).

Thus, light reflected from the reflecting surface 22R (reflecting surface 22L as well) is 1, as shown in FIG. 4, the reflector 20 (reflecting surface 22R) and a reflector 30 (four elliptic reflecting surface _{30 U} R, 30 U _{L, 30D} R, passes through the space between the 30D _L) so that the irradiated.

The reflecting surface 22R of the present embodiment (the reflecting surface 22L as well) is based on the linear focal line F _L, is constructed as follows.

[Configuration of Reflecting Surface 22R (Reflecting Surface 22R Part Lower than Inclined Plane I)]
The reflecting surface 22R (the reflecting surface 22R and a lower portion than the inclined planes I) is 2, as shown in FIG. 4, alpha ° against the horizontal plane _{H P} (e.g. 0.5 to 1.5 °) inclined downward In addition, a plurality of elliptical arc-shaped reflecting surfaces 22R _E1 appearing on a cut surface by an inclined plane I (see FIG. 1) passing through the lower end 11c of the light source 11 of the light source bulb 10 and a plane I ′ parallel to the inclined plane I (see FIG. 4), and a plurality of appearing on the cut surface by the vertical plane V _P (see FIG. 1) including the virtual ray from the light source bulb 10 reflected by the elliptical arc-shaped reflecting surface 22R _E1 appearing on the cut surface by the inclined plane I. The parabolic reflecting surface 22R _P1 (see FIG. 4) is configured as a smoothly continuous elliptical reflecting surface.

Each of the plurality of oval arc-shaped reflecting surface 22R _E1, as shown in FIG. 4, first focus F ₁ is set in the vicinity of the light source bulb 10, and the second focal point F ₂ is straight on the focal line F _L Is set to

Further, each of the plurality of parabolic reflecting surfaces _{22R P1,} FIG. 2, as shown in FIG. 4, the focal point _{F 32} is set to the lower front end 11b near the light emitting source 11 of the light source bulb 10, and the horizontal plane _{H P} Also, an optical axis inclined downward by α ° (for example, 0.5 to 1.5 °) is set.

In this manner, the reflecting surface 22R (the reflecting surface 22R and a lower portion than the inclined plane I), the focal _{F 32} to the lower end front 11b near the light emitting source 11 of the light source bulb 10 is set, the light source bulb 10 It is possible to project the projected image of the light emitting source 11 in a desired posture and form a predetermined light distribution pattern P1 (see FIG. 6) having a clear cut-off line.

[Configuration of Reflecting Surface 22R (Reflecting Surface 22R Above the Inclined Plane I)]
The reflecting surface 22R (the reflecting surface 22R portion above the inclined plane I) is 2, as shown in FIG. 4, similarly to the reflecting surface 22R and a lower portion, alpha ° relative to the horizontal plane _{H P} (e.g., 0. 5 to 1.5 °) cutting by an inclined plane I (see FIG. 1) that is inclined downward and passes through the lower end 11c of the light source 11 of the light source bulb 10 and a plane I ′ (see FIG. 4) parallel to the inclined plane I. A vertical plane V including a plurality of elliptical arc-shaped reflection surfaces 22R _E2 appearing on the surface and a virtual ray from the light source bulb 10 reflected by the elliptical arc-shaped reflection surface reflection surface 22R _E2 appearing on the cut surface by the inclined plane I _A plurality of parabolic reflecting surfaces 22R _P2 appearing on the cut surface by _P (see FIG. 1) is configured as a smoothly continuous elliptical reflecting surface.

Each of the plurality of oval arc-shaped reflecting surface 22R _E2, as shown in FIG. 4, first focus F ₁ is set in the vicinity of the light source bulb 10, and the second focal point F ₂ is straight on the focal line F _L Is set to

Further, each of the plurality of parabolic reflecting surfaces _{22R P2,} FIG. 2, as shown in FIG. 4, the focal point _{F 32} is set to the lower rear end 11a near the emission source 11 of the light source bulb 10, and a horizontal plane _{H P} An optical axis inclined downward by α ° (for example, 0.5 to 1.5 °) is set.

In this manner, the reflecting surface 22R (reflecting surface 22R portion above the inclined plane I), the focal _{F 32} to the lower end rear end 11a near the emission source 11 of the light source bulb 10 is set, the light source bulb 10 It is possible to project the projected image of the light emitting source 11 in a desired posture and form a predetermined light distribution pattern P1 (see FIG. 6) having a clear cut-off line.

As described above, the reflecting surface 22R (reflecting surface 22L as well), because they are configured relative to the linear focal line F _L, unlike conventional rear reflective surface, FIG. 1, as shown in FIG. 3 In addition, the shape gradually decreases as it goes upward (and downward in the vertical direction), and at least covers the entire range from the side of the light source bulb 10 to the rear. That is, the light source bulb 10 is almost entirely covered by the reflector 20 (the pair of left and right reflecting surfaces 22R and 22L) and the reflector 30 (four elliptical reflecting surfaces 30R _U , 30L _U , 30R _L and 30L _L ). It will be.

  For this reason, in the vehicle headlamp 100, the light emitted from the light source bulb 10 to the range from the side to the rear of the light source bulb 10 (the range from the side to the rear of the light source bulb is emitted). (Including the irradiation light) can be reflected almost without leaving. Therefore, it is possible to further improve the utilization efficiency of the irradiation light emitted from the light source bulb 10.

[Configuration of Four Elliptical Reflecting Surfaces 30R _U , 30L _U , 30R _L , 30L _L ]
Each of the four elliptical reflecting surfaces 30R _U , 30L _U , 30R _L , and 30L _L receives the irradiation light irradiated from the light source bulb 10 in front of the light source bulb 10 to its corresponding parabolic reflecting surfaces 40L _U and 40R _U. , 40L _L , 40R _L , reflecting surfaces reflecting toward the front of the light source bulb 10 so as to cover the front of the light source bulb 10, as shown in FIGS. 1 and 5, respectively. Is arranged.

Specifically, each of the four elliptical reflecting surfaces 30R _U , 30L _U , 30R _L , and 30L _L has a first focal point F ₃ set in the vicinity of the light source bulb 10 as shown in FIG. The focal point F ₄ is an elliptical reflecting surface set between the corresponding parabolic reflecting surfaces 40L _U , 40R _U , 40L _L , 40R _L and the reflecting surfaces 22R, 22L.

As shown in FIGS. 1 and 5, each of the pair of left and right reflecting surfaces 22R and 22L includes four elliptical reflecting surfaces 30R _U , 30L _U , 30R _L , and 30L _L, respectively, and a corresponding parabolic reflecting surface 40L. The minimum openings 23 (four openings 23 are illustrated in FIG. 5) for allowing the reflected light reflected toward _U , 40R _U , 40L _L , and 40R _L to pass therethrough are formed. The four openings 23 are formed at positions corresponding to the second focal points F ₄ of the four elliptical reflecting surfaces 30R _U , 30L _U , 30R _L , and 30L _L.

Specifically, the four openings 23 include four elliptical reflecting surfaces 30R _U , 30L _U , 30R _L , 30L _{L and} a first focal point F ₃ of the four elliptical reflecting surfaces 30R _U , 30L _U , 30R _L. , concluded a second focal point _{F 4} respectively 30L _L and four parabolic reflective surface _{40L U,} 40R _U, formed in 40L L, a straight line L1 of four disjoint and 40R _L, L2, L3, L4 respectively ing.

Further, the second focal point F ₄ of each of the four elliptical reflecting surfaces 30R _U , 30L _U , 30R _L , 30L _L is on the reflecting surfaces 22R, 22L of the first reflector 20 in order to minimize the opening 23, It is set in the vicinity. That is, the position of each of the second focal point _{F 4,} as shown in FIG. 5, the straight line L1 that connects the first focal point _{F 3} of the second focal point _{F 4,} L2, L3, L4 is parabolic reflective surface 40L _U , 40R _U , 40L _L , and 40R _L are selected so as not to intersect.

As described above, the four openings 23 include the four elliptical reflecting surfaces 30R _U , 30L _U , 30R _L , 30L _L , the first focal point F ₃ , and the four elliptical reflecting surfaces 30R _U , 30L _U , 30R _L , 30L _L bear second focal point _{F 4} each and four parabolic reflective surface _{40L U, 40R U, 40L L} , are formed respectively on four straight lines L1, L2, L3, L4 not intersect the 40R _L because there, direct light from the light source bulb 10, through the openings 23, to prevent parabolic reflective surface _{40L U, 40R U, 40L L} , the generation of glare light due to incident 40R _L It is possible.

Moreover, even if the height in the vertical direction (vertical direction) of the reflector 20 (the pair of left and right reflecting surfaces 22R and 22L) is increased to expand the reflecting area, the four elliptical reflecting surfaces 30R _U , 30L _U and 30R _L , 30L _L is reflected by the reflector 20 (the pair of left and right reflection surfaces 22R, 22L) without being blocked by the reflector 20 (the pair of left and right reflection surfaces 22R, 22L). Will be.

  For this reason, it is possible to increase the reflection area of the reflector 20 (the pair of left and right reflection surfaces 22R, 22L) by increasing the height of the reflector 20 (the pair of left and right reflection surfaces 22R, 22L) in the vertical direction (vertical direction). Therefore, the utilization efficiency of the irradiation light emitted from the light source bulb 10 can be improved.

The reflected light from the elliptic reflecting surfaces 30R _U, as shown in FIG. 5, the reflecting surface passes through 22L upper side formed an opening 23, corresponding to the elliptical reflective surface 30R _U parabolic reflective surface 40L _U Irradiate. The same applies to the reflected light from the other elliptical reflecting surfaces 30L _U , 30R _L , 30L _L.

The elliptical reflecting surfaces 30R _U , 30L _U , 30R _L , and 30L _L are respectively provided from the upper end or the lower end of the pair of left and right reflecting surfaces 22R and 22L, as shown in FIGS. Projecting reflecting surfaces 31R _U , 31L _U , 31R _L , 31L _L for closing the upper end portion or the lower end portion for reflecting the irradiation light from the leaking light source bulb 10 toward the corresponding parabolic reflecting surface are provided. Is formed.

Similar to the four elliptical reflecting surfaces 30R _U , 30L _U , 30R _L , and 30L _L , the first focal point F ₃ is also near the light source bulb 10 in these projecting reflecting surfaces 31R _U , 31L _U , 31R _L , and 31L _L. And the second focal point F ₄ is an elliptical reflecting surface set between the corresponding parabolic reflecting surfaces 40L _U , 40R _U , 40L _L , 40R _L and the reflecting surfaces 22R, 22L.

These projection-like reflecting surfaces 31R _U , 31L _U , 31R _L , 31L _L can capture and reflect all the light emitted from the light source bulb 10 without leaving it. That is, it is possible to further improve the utilization efficiency of the irradiation light emitted from the light source bulb 10.

[Configuration of Four Parabolic Reflective Surfaces 40L _U , 40R _U , 40L _L , 40R _L ]
Four parabolic reflective surface _{40L U, 40R U, 40L L} , the 40R _L respectively, the corresponding ellipse group reflecting surface _{30U R, 30U L, 30D R} , reflective surface for reflecting the reflected light from 30D _L As shown in FIGS. 1 and 5, the light source bulb 10 is arranged on both upper left, lower left, upper right and lower right sides of the light source bulb 10.

Specifically, each of the four parabolic reflecting surfaces 40L _U , 40R _U , 40L _L , and 40R _L has a focal point F ₅ whose corresponding elliptic reflecting surfaces 30U _R , 30U _L , 30D _R, a parabolic reflective surface set to the second focal point _{F 4} of 30D _L.

The reflected light from the elliptic reflecting surfaces 30R _U, as shown in FIG. 5, passes through the opening 23, is reflected by the parabolic reflective surface 40L _U corresponding to the elliptical reflecting surface 30R _U, 6 Thus, the predetermined light distribution pattern P2 superimposed on the predetermined light distribution pattern P1 is formed. The same applies to the reflected light from the other elliptical reflecting surfaces 30L _U , 30R _L , 30L _L.

As described above, according to the vehicle headlamp 100 of the present embodiment, as shown in FIGS. 1 and 2, a linear focal line F _L is a reflector 20 (reflecting surface 22R in the front view of the lamp, 22L) and the reflector 30 (four elliptical reflecting surfaces 30U _R , 30U _L , 30D _R , 30D _L ).

For this reason, according to the vehicle headlamp 100 of the present embodiment, the reflected light from the reflection surface 22R (the same applies to the reflection surface 22L) is reflected by the reflector 20 (reflection surfaces 22R, 22L) and the reflector 30 (four elliptical systems). The light passes through the space between the reflecting surfaces 30U _R , 30U _L , 30D _R , 30D _L ) and is irradiated.

That is, according to the vehicle headlamp 100 of this embodiment, the reflector 30 to form an opening on the (four elliptic reflecting surfaces _{30U R, 30U L, 30D R} , 30D L. Corresponding to the conventional front reflecting surface) I don't need it.

Therefore, according to the vehicle headlamp 100 of the present embodiment, the reflector 30 (four elliptical reflecting surfaces 30U _R , 30U _L , 30D _R , 30D _L. This increases the reflection area (corresponding to the front reflection surface of the light source), so that the utilization efficiency of the irradiation light emitted from the light source bulb 10 can be improved.

Further, according to the vehicle headlamp 100 of this embodiment, the reflector 30 to form an opening on the (four elliptic reflecting surfaces _{30U R, 30U L, 30D R} , 30D L. Corresponding to the conventional front reflecting surface) Since it is not necessary, it is possible to prevent glare caused by direct light from the light source bulb 10 being emitted from the opening as in the prior art.

Further, according to the vehicle headlamp 100 of this embodiment, (also reflecting surface 22L) reflecting surface 22R is, because it is composed on the basis of the linear focal line F _L, and the conventional rear reflective surface Unlike FIG. 1 and FIG. 3, the shape gradually decreases toward the top in the vertical direction (or down in the vertical direction), and at least covers the entire range from the side of the light source bulb 10 to the rear. That is, the light source bulb 10 is almost entirely covered by the reflector 20 (the pair of left and right reflecting surfaces 22R and 22L) and the reflector 30 (four elliptical reflecting surfaces 30R _U , 30L _U , 30R _L and 30L _L ). It will be.

  For this reason, according to the vehicle headlamp 100 of the present embodiment, the irradiation light irradiated from the light source bulb 10 to the range from the side of the light source bulb 10 to the rear (from the side of the light source bulb 10 to the rear). It is possible to reflect almost all of the light (including the irradiation light irradiated to the range up to).

  Therefore, according to the vehicle lamp 100 of the present embodiment, it is possible to further improve the utilization efficiency of the irradiation light emitted from the light source bulb 10.

Further, according to the vehicle headlamp 100 of this embodiment, (also reflecting surface 22L) reflecting surface 22R as the ellipse group reflecting surface, since it is configured relative to the linear focal line F _L, As shown in FIGS. 2 and 4, the irradiation light irradiated from the light source bulb 10 to at least a range from the side to the rear of the light source bulb 10 is parallel to the inclined plane I (see FIG. 1) and in the horizontal direction. It will be reflected to diffuse.

Thereby, according to the vehicle headlamp 100 of the present embodiment, as shown in FIG. 6, the upper end line is substantially parallel to the horizontal line H and the upper end line on the vertical screen arranged at a predetermined position in front. is positioned in (the same angle as the inclination angle of the linear focal line F _L for example 0.5 to 1.5 °. vertical line V) position under alpha ° from the horizontal line H, overall uniform predetermined light distribution The pattern P1 can be formed.

The position of the predetermined light distribution pattern P1 is formed it can be adjusted by adjusting the inclination angle of the linear focal line F _L for the vertical line V.

  Further, according to the vehicle headlamp 100 of the present embodiment, the opening 11 into which the light source bulb 10 is inserted is not the center of the rear reflecting surface as in the prior art, but the right reflecting surface 22R as shown in FIG. And the left reflecting surface 22L, that is, at the ends of the pair of left and right reflecting surfaces 22R and 22L.

  Therefore, according to the vehicle headlamp 100 of the present embodiment, in the light distribution pattern from the pair of left and right reflecting surfaces, a dark portion appears at the end of the light distribution pattern, and unevenness does not appear in front of the vehicle. It will be. Further, the light distribution patterns from the pair of left and right reflecting surfaces are overlapped.

  Therefore, as compared with the conventional case where an opening into which the light source bulb 10 is inserted is formed at the center of the rear reflecting surface, it is possible to prevent or reduce the occurrence of uneven light distribution due to the lack of irradiation light from the light source bulb 10. It becomes possible.

  Next, a modified example will be described.

[First Modification]
In the above embodiment, the focal line F _L has been described as a linear focal line, the present invention is not limited thereto. For example, the focal line F _L may be a polygonal line focal line formed by connecting a plurality of straight line focus different inclination angles.

Hereinafter, the configuration of the reflection surface 22R (this also applies to the reflection surface 22L) of Modification 1 will be described. 7, the reflecting surface 22R is set to (as well as reflective surfaces 22L), an example of a line-shaped focal line F _L which connects the different two linear focal line inclination angles.

[Configuration of Reflecting Surface 22R (Reflecting Surface 22R Part Lower than Inclined Plane I)]
As shown in FIG. 7, α ₁ ° (for example, 0.5 to 1.5) with respect to the vertical line V on the reflection surface 22R (the reflection surface 22R portion below the inclined plane I) of the first modification. °) the lower focal line F _L1 of rearwardly inclined straight line shape is set.

The straight lower focal line _{F L1,} as shown in FIG. 1, the reflector 20 (reflecting surface 22R) and the reflector 30 when viewed from the lamp front (four elliptic reflecting surfaces _{30U R, 30U L, 30D R} , 30D _L ).

Thus, light reflected from the reflecting surface 22R of the first variation (reflecting surface 22R and a lower portion than the inclined planes I) is a reflector 20 (reflecting surface 22R) and a reflector 30 (four elliptic reflecting surface 30 U _R , 30U _L , 30D _R , 30D _L ), the light passes through and is irradiated.

The reflecting surface 22R of the first variation (reflecting surface 22R and a lower portion than the inclined planes I) is based on the linear focal line F _L1, and is configured as follows.

The reflecting surface 22R (the reflecting surface 22R and a lower portion than the inclined planes I) is 4, as shown in FIG. 7, the horizontal plane _{H P} against and alpha ₁ ° (e.g. 0.5 to 1.5 °) downwards A plurality of elliptical arcs appearing on a cutting plane by an inclined plane I ₁ (see FIGS. 1 and 7) that is inclined and passes through the lower end 11c of the light source 11 of the light source bulb 10 and a plane I ₁ ′ parallel to the inclined plane I _1. of the reflecting surface _{22R E1} (see FIG. 4), and the inclined plane _{I 1} vertical plane _V P including virtual ray from the light source bulb 10 is reflected by the elliptical arc-shaped reflection surface reflecting surface _{22R E1} appearing on the cut surface by ( A plurality of parabolic reflecting surfaces 22R _P1 (see FIG. 4) appearing on the cut surface according to FIG. 1 are configured as smoothly continuous elliptical reflecting surfaces.

Each of the plurality of oval arc-shaped reflecting surface 22R _E1, as shown in FIG. 4, the first focus F ₁ is set in the vicinity of the light source bulb 10, and the second focal point F ₂ is straight lower focal line F It is set on _L1 .

Further, each of the plurality of parabolic reflecting surfaces _{22R P1,} FIG. 4, as shown in FIG. 7, the focus _{F 32} is set to the lower front end 11b near the light emitting source 11 of the light source bulb 10, and the horizontal plane _{H P} Also, an optical axis inclined downward by α ₁ ° (for example, 0.5 to 1.5 °) is set.

[Configuration of Reflecting Surface 22R (Reflecting Surface 22R Above the Inclined Plane I)]
As shown in FIG. 7, the reflective surface 22R (the reflective surface 22R portion above the inclined plane I) of Modification 1 has α _{1 with} respect to the linear lower focal line F _L1 (an extension thereof). ° (e.g., 0.5 to 1.5 °) straight upper focal line _{F L2} which is inclined forward, is set. That is, on the reflection surface 22R (the reflection surface 22R portion above the inclined plane I) of the first modification, a linear upper focal line inclined forward by β ° (for example, 3 ° at the maximum) with respect to the vertical line V. _FL2 is set.

The linear upper focal line _{F L2,} as shown in FIG. 1, the reflector 20 (reflecting surface 22R) and the reflector 30 when viewed from the lamp front (four elliptic reflecting surfaces _{30U R, 30U L, 30D R} , 30D L ) Is set between.

Thus, light reflected from the reflecting surface 22R of the first variation (reflecting surface 22R portion above the inclined plane I) is a reflector 20 (reflecting surface 22R) and a reflector 30 (four elliptic reflecting surface _{30 U} R, 30U _L , 30D _R , 30D _L ) will pass through and be irradiated.

The reflecting surface 22R of the first variation (reflecting surface 22R portion above the inclined plane I) is based on the linear focal line F _L2, and is configured as follows.

The reflecting surface 22R (the reflecting surface 22R portion above the inclined plane I) is 4, as shown in FIG. 7, alpha ₂ ° (e.g., 0.5 to 1.5 °) relative to the inclined plane _{I 1} downward A plurality of elliptical arc-shaped reflecting surfaces 22R _E2 (see FIG. 4) appearing on the cut surface of the inclined plane I ₂ (see FIG. 7) inclined in parallel to the inclined plane I ₂ and a plane I ₂ ′ parallel to the inclined plane I ₂ , and the inclined plane A plurality of parabolic reflections appearing on the cut surface by the vertical surface V _P (see FIG. 1) including the virtual rays from the light source bulb 10 reflected by the reflecting surface 22R _E2 of the elliptical arc shape appearing on the cut surface by I ₂ The surface 22R _P2 (see FIG. 4) is configured as an elliptical reflecting surface that is smoothly continuous.

Each of the plurality of oval arc-shaped reflecting surface _{22R E2,} as shown in FIG. 4, first focus _{F 1} is set in the vicinity of the light source bulb 10, and an upper second focal point _{F 2} is linear focal line _{F L2} Is set on.

In addition, as shown in FIGS. 4 and 7, each of the plurality of parabolic reflecting surfaces 22 </ b> R _P <b> 2 has a focus F ₃₂ set in the vicinity of the lower end rear end 11 a of the light source 11 of the light source bulb 10, and the first inclined surface than the surface _{I 1} is inclined to the alpha ₁ ° (e.g. 0.5 to 1.5 °) downward (i.e., beta ° than the horizontal plane _{H P} (e.g. up to 3 °) inclined downwardly) the optical axis is set Yes.

As described above, the reflective surface 22R of the first variation (reflecting surface 22R and a lower portion than the inclined plane I), because they are configured relative to the straight lower focal line F _L1, FIG. 2, As shown in FIG. 7, the light irradiated from the light source bulb 10 to the range from the side to the rear of the light source bulb 10 is diffused in parallel and horizontally with respect to the inclined plane I ₁ (see FIG. 1). Will be reflected.

As a result, according to the first modification, as shown in FIG. 8, the upper end line is substantially parallel to the horizontal line H and the upper end line extends from the horizontal line H to α ₁ on the vertical screen arranged at a predetermined front position. ° (e.g., 0.5 to 1.5 °. the same angle as the linear slope angle of the lower side focal line F _L1 against the vertical line V) can form a predetermined light distribution pattern P3 positioned in the down position and Become.

The position of the predetermined light distribution pattern P3 is formed can be adjusted by adjusting the inclination angle of the straight lower focal line F _L1 against the vertical line V.

Further, the reflecting surface 22R of the first variation (reflecting surface 22R portion above the inclined plane I), because they are configured relative to the straight upper focal line F _L2, FIG. 2, as shown in FIG. 7 Furthermore, the irradiation light irradiated from the light source bulb 10 to the range from the side to the rear of the light source bulb 10 is reflected so as to be diffused in parallel and horizontally with respect to the inclined plane I ₂ (see FIG. 1). It becomes.

Thus, according to the first modification, as shown in FIG. 8, the upper end line is substantially parallel to the horizontal line H and the upper end line is the predetermined light distribution pattern P3 on the vertical screen arranged at a predetermined position in front. It is possible to form the predetermined light distribution pattern P4 located at a position α ₂ ° below the upper end line of the. That is, to form a predetermined light distribution pattern P4 in which the upper end line is located (the same angle as the inclination angle of the straight upper focal line F _L2 for example up to 3 °. Vertical line V) position of the lower horizontal line beta ° from H Is possible.

The position of the predetermined light distribution pattern P4 is formed can be adjusted by adjusting the inclination angle of the straight lower focal line F _L2 against the vertical line V.

As described above, in this modification 1, since the use of a polygonal line focal line F _L to the different two linear focal line F _L1, F _L2 and ligated inclination angles, the predetermined light distribution pattern P3 The predetermined light distribution pattern P4 is formed in a shifted state.

  For this reason, even if a light source bulb 10 having a high luminance is used, it is possible to form a uniform light distribution pattern with less glare as a whole. In addition, also in the first modification, the same effects as those of the above-described embodiment are obtained.

[Second Modification]
Furthermore, the focal line F _L may be a curved focal line which is connected to the S-shape as a whole a curved focal line.

  Hereinafter, the configuration of the reflection surface 22R (this also applies to the reflection surface 22L) of Modification 2 will be described. FIG. 9 shows an example of a curved focal line that is set on the reflective surface 22R (the same applies to the reflective surface 22L) and connects the curved focal lines in an S shape as a whole.

[Configuration of Reflecting Surface 22R (Reflecting Surface 22R Part Lower than Inclined Plane I)]
As shown in FIG. 9, the reflection surface 22R (the reflection surface 22R portion below the inclined plane I) of Modification 2 is α ° with respect to the vertical line V (for example, 0.5 to 1.5 °). ) lower focal line F _C1 of contact with the straight line L is inclined rearwardly curved (e.g. arc of a predetermined curvature) is set.

As shown in FIG. 1, the curved lower focal line F _C1 includes a reflector 20 (reflecting surface 22R) and a reflector 30 (four elliptical reflecting surfaces 30U _R , 30U _L , 30D _R , 30D) in the front view of the lamp. _L ).

Thus, light reflected from the reflecting surface 22R of the second variation (reflecting surface 22R and a lower portion than the inclined planes I) is a reflector 20 (reflecting surface 22R) and a reflector 30 (four elliptic reflecting surface 30 U _R , 30U _L , 30D _R , 30D _L ), the light passes through and is irradiated.

The reflecting surface 22R of the second variation (reflecting surface 22R and a lower portion than the inclined planes I) is based on the curved focal line F _C1, and is configured as follows.

The reflecting surface 22R (reflecting surface 22R and a lower portion than the inclined planes I) is 4, as shown in FIG. 9, alpha ° against the horizontal plane _{H P} (e.g. 0.5 to 1.5 °) inclined downward In addition, a plurality of elliptical arc-shaped reflecting surfaces 22R appearing on a cut surface by an inclined plane I (see FIGS. 1 and 9) passing through the lower end 11c of the light source 11 of the light source bulb 10 and a plane I ′ parallel to the inclined plane I. _E1 (see FIG. 4) and a vertical plane V _P (see FIG. 1) including a virtual ray from the light source bulb 10 reflected by the reflecting surface 22R _E1 having an elliptical arc shape that appears on the cut surface by the inclined plane I. A plurality of parabolic reflection surfaces 22R _P1 (see FIG. 4) appearing on the cut surface are configured as smoothly continuous elliptical reflection surfaces.

Each of the plurality of oval arc-shaped reflecting surface 22R _E1, as shown in FIG. 4, the first focus F ₁ is set in the vicinity of the light source bulb 10, and the second focal point F ₂ is curved lower focal line F It is set on _C1 .

Further, each of the plurality of parabolic reflecting surfaces _{22R P1,} as shown in FIGS. 4 and 9, further forward position near the 0.5~10mm from the bottom front end 11b of the light emitting source 11 of the focus _{F 32} is a light source bulb 10 It is set to, and, alpha ° the horizontal plane H _P (e.g. 0.5 to 1.5 °) optical axis inclined downward is set.

[Configuration of Reflecting Surface 22R (Reflecting Surface 22R Above the Inclined Plane I)]
As shown in FIG. 9, the reflection surface 22R (the reflection surface 22R portion above the inclined plane I) of Modification 2 is α ° (for example, 0.5 to 1.5 °) with respect to the vertical line V. upper focal line F _C2 curved in contact with the straight line L is inclined forward (e.g. an arc of a predetermined curvature) is set.

As shown in FIG. 1, the curved upper focal line F _C2 includes a reflector 20 (reflecting surface 22R) and a reflector 30 (four elliptical reflecting surfaces 30U _R , 30U _L , 30D _R , 30D _{L when} viewed from the front of the lamp. ) Is set between.

Thus, light reflected from the reflecting surface 22R of the second variation (reflecting surface 22R portion above the inclined plane I) is a reflector 20 (reflecting surface 22R) and a reflector 30 (four elliptic reflecting surface _{30 U} R, 30U _L , 30D _R , 30D _L ) will pass through and be irradiated.

The reflecting surface 22R of the second variation (reflecting surface 22R portion above the inclined plane I) is based on the curved upper focal line F _C2, it is constructed as follows.

The reflecting surface 22R (the reflecting surface 22R portion above the inclined plane I) is 4, as shown in FIG. 9, alpha ° against the horizontal plane _{H P} (e.g. 0.5 to 1.5 °) inclined downward In addition, a plurality of elliptical arc-shaped reflecting surfaces 22R _E2 appearing on a cut surface by an inclined plane I (see FIGS. 1 and 9) passing through the lower end 11c of the light source 11 of the light source bulb 10 and a plane I ′ parallel to the inclined plane I. (See FIG. 4), and cutting by the vertical plane V _P (see FIG. 1) including the virtual ray from the light source bulb 10 reflected by the reflecting surface 22R _E2 having the elliptical arc shape that appears on the cutting plane by the inclined plane I a plurality of parabolic reflecting surfaces 22R _P2 appearing on the surface is configured smoothly as a continuous elliptic reflecting surface.

Each of the plurality of oval arc-shaped reflecting surface _{22R E2,} as shown in FIG. 4, first focus _{F 1} is set in the vicinity of the light source bulb 10, and an upper second focal point _{F 2} is curved focal line _{F C2} Is set on.

Further, each of the plurality of parabolic reflecting surfaces _{22R P2,} as shown in FIGS. 4 and 9, the rear position of the further 0.5~10mm from the lower end rear end 11a of the light emitting source 11 of the focus _{F 31} is a light source bulb 10 It is set in the vicinity, and the horizontal plane H _P α ° (eg 0.5 to 1.5 °) optical axis inclined downward is set.

As described above, the reflective surface 22R of the second variation (reflecting surface 22R and a lower portion than the inclined planes I) is configured relative to the curved lower focal line F _C1, and the reflective surface 22R (reflecting surface 22R portion above the inclined plane I) is configured relative to the curved upper focal line F _C2.

  For this reason, as shown in FIGS. 2 and 9, the reflecting surface 22R tilts the irradiation light irradiated from the light source bulb 10 to the range from the side to the rear side of the light source bulb 10 (see FIG. 1). The light is reflected so as to diffuse in the vertical and horizontal directions.

  Thus, according to the second modification, as shown in FIG. 10, the upper end line is substantially parallel to the horizontal line H and the upper end line is α ° from the horizontal line H on the vertical screen arranged at a predetermined position in front. It is possible to form the predetermined light distribution pattern P5 located at a lower position (for example, 0.5 to 1.5 °, the same angle as the inclination angle of the straight line L with respect to the vertical line V).

  The position where the predetermined light distribution pattern P5 is formed can be adjusted by adjusting the inclination angle of the straight line L with respect to the vertical line V.

As described above, in this second modification, since using a curved focal line F _L1, F _L2 curved focal line which is connected to the S-shape as a whole F _L, a predetermined light distribution pattern P5 is Compared to the other light distribution patterns P1 to P4, it has a certain width in the vertical direction. For this reason, in the second modification, even if a light source bulb 10 having a high luminance is used, a light distribution pattern with less glare is obtained.

  The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. The present invention can be implemented in various other forms without departing from the spirit or main features thereof.

It is a longitudinal cross-sectional view for demonstrating the main structures of the vehicle lamp of this embodiment. FIG. 2 is a side view of the vehicular lamp illustrated in FIG. 1 and is a diagram for describing linear focal lines set on the reflecting surfaces 22R and 22L as elliptical reflecting surfaces. It is the perspective view which put the viewpoint in the diagonally upper right of the vehicle lamp shown in FIG. It is a figure for demonstrating the structure of the reflective surfaces 22R and 22L as an elliptical reflective surface. It is a front view of the vehicle lamp shown in FIG. It is a figure for demonstrating the example of the light distribution pattern formed with the vehicle lamp of this embodiment. It is a side view of the modification 1 of the vehicle lamp of this embodiment, and is a figure for demonstrating the polygonal focal line set to the reflective surfaces 22R and 22L as an elliptical-type reflective surface. It is a figure for demonstrating the light distribution pattern example formed by the modification 1 of the vehicle lamp of this embodiment. It is a side view of the modification 2 of the vehicle lamp of this embodiment, and is a figure for demonstrating the S-shaped focal line set to the reflective surfaces 22R and 22L as an elliptical-type reflective surface. It is a figure for demonstrating the light distribution pattern example formed by the modification 2 of the vehicle lamp of this embodiment. It is sectional drawing which cut | disconnected the conventional vehicle lamp in the horizontal surface containing the lamp optical axis AX.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Vehicle lamp, 10 ... Light source bulb, 11 ... Light emission source, 11a ... Lower end rear end, 11b ... Lower end front end, 12 ... Glass tube, 20 ... Reflective surface, 21 ... Opening, 22L ... Reflective surface, 22R ... Reflective surface 22R _E1 ... Elliptical arc-shaped reflecting surface, 22R _E2 ... Elliptical arc-shaped reflecting surface, 22R _P1 ... Parabolic reflecting surface, 22R _P2 ... Parabolic reflecting surface, 23... Opening, 31R _U , 31L _U , 31R _L , 31L _L ... Ellipsoidal reflecting surface, 40L _U , 40R _U , 40L _L , 40R _L ... Parabolic reflecting surface, F ₁ , F ₂ , F ₃ , F ₃₁ , F ₃₂ , F ₄ , F ₅ ... Focus , F _{C1 ...} lower focal line, F _{C2 ...} upper focal line, F L _... focal line, F _{L1 ...} lower focal line, F _{L2 ...} upper focal line, H ... horizontal lines, H P _... horizontal plane, I ... inclined plane , I 1 _... inclined plane, I 2 _... inclined plane, L ... straight, L1 ... Line, P1 to P5 ... predetermined light distribution pattern, V ... vertical line, V P _... vertical plane

Claims (5)

A reflector in which an opening into which the light source bulb is inserted is formed;
A light source bulb that is inserted into the opening and attached to the reflector in a state in which the longitudinal direction coincides with a lamp optical axis inclined downward by a predetermined angle with respect to a horizontal plane;
In the vehicular lamp provided with
The reflector includes a pair of left and right reflecting surfaces arranged so as to cover at least the range from the side of the light source bulb to the rear on both the left and right sides with respect to the longitudinal direction of the light source bulb,
Each of the pair of left and right reflecting surfaces is an elliptical reflecting surface that reflects irradiation light irradiated from the light source bulb to at least a range from the side of the light source bulb to the rear, and forms a predetermined light distribution pattern, A focal line extending in the vertical direction inclined forward by a predetermined angle with respect to the vertical line is set,
Each of the pair of left and right reflecting surfaces as the elliptical reflecting surfaces is a plurality of elliptical arc-shaped reflecting surfaces appearing on a cutting plane formed by an inclined plane inclined downward by a predetermined angle with respect to a horizontal plane and a plane parallel to the inclined plane, And, it is constituted by a plurality of parabolic reflecting surfaces appearing on a cutting surface by a vertical surface including a virtual ray from the light source bulb reflected by an elliptical arc-shaped reflecting surface appearing on the cutting surface by the inclined plane,
Each of the plurality of elliptical arc-shaped reflecting surfaces has a first focus set in the vicinity of the light source bulb, and a second focus set on the focal line.
Each of the plurality of parabolic reflecting surfaces has a focal point set in the vicinity of the light source bulb, and an optical axis inclined downward by a predetermined angle from a horizontal plane. A first reflector having an opening into which the light source bulb is inserted;
A light source bulb that is inserted into the opening and attached to the first reflector in a state in which the longitudinal direction coincides with a lamp optical axis inclined downward by a predetermined angle with respect to a horizontal plane;
A second reflector having four elliptical reflecting surfaces and disposed in front of the light source bulb so as to cover the front of the light source bulb;
Four parabolic reflecting surfaces disposed on both sides with respect to the longitudinal direction of the light source bulb,
Each of the four elliptical reflecting surfaces is a reflecting surface that reflects the irradiation light irradiated from the light source bulb to the front of the light source bulb toward the corresponding parabolic reflecting surface, and the first focal point is the Set near the light source bulb, and the second focal point is set between the corresponding parabolic reflecting surface,
Each of the four parabolic reflecting surfaces is a reflecting surface that reflects the reflected light from the corresponding elliptic reflecting surface and forms a first light distribution pattern, and the focal point is the corresponding elliptic reflecting. In the vehicular lamp set to the second focus of the surface,
The first reflector includes a pair of left and right reflecting surfaces arranged so as to cover at least a range from the side of the light source bulb to the rear on both the left and right sides with respect to the longitudinal direction of the light source bulb,
Each of the pair of left and right reflecting surfaces reflects the irradiation light irradiated from the light source bulb to at least the range from the side of the light source bulb to the rear, and is superimposed on the first light distribution pattern. And a focal line extending in a vertical direction inclined forward by a predetermined angle with respect to a vertical line is set between the first reflector and the second reflector in a front view of the lamp. And
Each of the pair of left and right reflecting surfaces as the elliptical reflecting surfaces is a plurality of elliptical arc-shaped reflecting surfaces appearing on a cutting plane formed by an inclined plane inclined downward by a predetermined angle with respect to a horizontal plane and a plane parallel to the inclined plane, And, it is constituted by a plurality of parabolic reflecting surfaces appearing on a cutting surface by a vertical surface including a virtual ray from the light source bulb reflected by an elliptical arc-shaped reflecting surface appearing on the cutting surface by the inclined plane,
Each of the plurality of elliptical arc-shaped reflecting surfaces has a first focus set in the vicinity of the light source bulb, and a second focus set on the focal line.
Each of the plurality of parabolic reflecting surfaces has a focal point set in the vicinity of the light source bulb, and an optical axis inclined downward by a predetermined angle from a horizontal plane. The first reflector is formed with four openings for allowing reflected light reflected from each of the four elliptical reflecting surfaces toward the corresponding parabolic reflecting surface.
The four openings connect the first focal point of the four elliptical reflecting surfaces and the second focal point of each of the four elliptical reflecting surfaces, and are on four straight lines that do not intersect with the four parabolic reflecting surfaces, respectively. The vehicular lamp according to claim 2, wherein the vehicular lamp is formed.   Each of the four elliptical reflecting surfaces is for reflecting the irradiation light from the light source bulb leaking from the upper end or the lower end of each of the left and right reflecting surfaces toward the corresponding parabolic reflecting surface. 4. The vehicular lamp according to claim 2, wherein a projection-like reflecting surface that closes the upper end portion or the lower end portion is formed. Of the pair of left and right reflecting surfaces as the elliptical reflecting surface, the reflecting surface portion below the inclined plane is constituted by a plurality of parabolic lower reflecting surfaces appearing on a cut surface by the vertical surface. And
Of the pair of left and right reflecting surfaces as the elliptical reflecting surface, the reflecting surface portion above the inclined plane is composed of a plurality of parabolic upper reflecting surfaces appearing on the cut surface by the vertical surface. ,
Each of the plurality of parabolic lower reflective surfaces has a focal point set in the vicinity of the front end of the light source of the light source bulb, and an optical axis inclined downward by a predetermined angle from the horizontal plane is set.
Each of the plurality of parabolic upper reflecting surfaces has a focal point set in the vicinity of the rear end at the lower end of the light source of the light source bulb, and an optical axis inclined downward by a predetermined angle from the horizontal plane. The vehicle lamp according to any one of claims 1 to 4.

Images