JP2007287521A - Vehicular lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture of low profile with a light emitting element as a light source, in which light distribution is controlled precisely and sufficient illumination quantity is assured. <P>SOLUTION: A plurality of light emitting elements 14 are arranged circumferentially with specified intervals, around an optical axis Ax between a convex lens 12 and a rear side focal point F. A reflector 16 is arranged between the light emitting elements and the optical axis Ax to allow a low-profile lighting fixture with increased quantity of illumination. The profile of a cross section along the flat plane containing the optical axis Ax and a center A of light emission of the light emitting elements 14, of a reflecting surface 16a of the reflectors 16, is formed of hyperbola H on a second focus side of a pair of hyperbolas whose first focus is a rear side focus F and a second focus is the center A of light emission. So, the reflection light from the reflectors 16 is, in the flat plane, made incident on the convex lens 12 as direct light of which the first focus is taken as a virtual light source, for raised precision in light distribution control. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicular illumination lamp using a light emitting element as a light source.

  In recent years, light-emitting elements such as light-emitting diodes have been frequently used as light sources for vehicular illumination lamps.

  For example, “Patent Document 1” includes a convex lens disposed on the optical axis extending in the front-rear direction of the lamp and a light emitting element disposed in the vicinity of the rear focal point of the convex lens, and direct light from the light emitting element is projected to the convex lens. Describes a vehicular illumination lamp that is configured to irradiate the front of the lamp under deflection control.

JP-A-2005-44683

  In the vehicular illumination lamp described in the above-mentioned “Patent Document 1”, by arranging the light emitting element in the vicinity of the rear focal point of the convex lens, the direct light from the light emitting element can be accurately controlled. However, there are the following problems.

  That is, in the vehicular illumination lamp described in “Patent Document 1”, since the light emitting element is located in the vicinity of the rear focal point of the convex lens, the front-rear length of the lamp cannot be further reduced, There is a problem that the lamp cannot be sufficiently thinned, and since only one light emitting element can be arranged in the vicinity of the rear focal point of the convex lens, it is possible to secure a sufficient amount of irradiation light. There is also the problem that it is not possible.

  The present invention has been made in view of such circumstances, and in a vehicle illumination lamp using a light emitting element as a light source, the light distribution control can be performed with high accuracy, and the lamp is made thinner. An object of the present invention is to provide a vehicular illumination lamp capable of ensuring a sufficient amount of irradiation light.

  In the present invention, the above-described object is achieved by devising the arrangement of the light emitting elements and arranging a predetermined reflector.

That is, the vehicular illumination lamp according to the present invention is:
In a vehicular illumination lamp comprising a convex lens arranged on an optical axis extending in the front-rear direction of the lamp, and a light emitting element arranged behind the convex lens,
A plurality of the light emitting elements are arranged around the optical axis between the convex lens and the rear focal point of the convex lens at a predetermined interval in the circumferential direction around the optical axis,
Between each of the light emitting elements and the optical axis, a reflector that reflects light from the light emitting elements forward is disposed, respectively.
A cross-sectional shape of the reflecting surface of each reflector along a plane including the light emission center of each light emitting element and the optical axis is a point near the rear focal point of the convex lens as a first focus, and each light emitting element. It is formed by a hyperbola on the second focal point side in a pair of hyperbola with a point near the light emission center as the second focal point.

  The type of the “vehicle illumination lamp” is not particularly limited, and for example, a headlamp, a fog lamp, a cornering lamp, a daytime running lamp, or a lamp unit constituting a part thereof can be employed.

  As long as the “optical axis” is an axis extending in the lamp front-rear direction, it may or may not coincide with the axis extending in the vehicle front-rear direction. .

  The “convex lens” is not limited to a lens having a specific shape as long as it has a positive refractive power. For example, a plano-convex lens, a biconvex lens, a convex meniscus lens, or the like can be used.

  The above “light emitting element” means an element-like light source having a light emitting chip that emits light substantially in the form of dots, and the type thereof is not particularly limited, and examples thereof include a light emitting diode and a laser diode. Can be adopted.

  Specific values such as the number of the plurality of “light emitting elements” and the interval in the circumferential direction are not particularly limited. In addition, the plurality of “light emitting elements” do not necessarily have to be configured to be always lit simultaneously, and may be configured to be appropriately lit in whole or in part.

  The “reflecting surface” of each of the reflectors has a cross-sectional shape along the plane including the emission center and the optical axis of each light-emitting element. The cross-sectional shape along a plane other than this plane is as follows. It is not particularly limited.

  As shown in the above configuration, the vehicular illumination lamp according to the present invention includes a convex lens disposed on the optical axis extending in the front-rear direction of the lamp, and a light emitting element disposed behind the convex lens. However, a plurality of the light emitting elements are arranged around the optical axis between the convex lens and the rear focal point at a predetermined interval in the circumferential direction around the optical axis. Between the optical axes, reflectors that reflect light from the light emitting elements forward are arranged, so that the light emitted from each light emitting element and incident on each reflector is reflected by the reflector. After entering the convex lens, the deflection is controlled by the convex lens and the light is emitted forward.

  At this time, the cross-sectional shape of the reflecting surface of each reflector along the plane including the light emission center and the optical axis of each light emitting element is a point near the rear focal point of the convex lens as the first focal point, and Since it is formed by a hyperbola on the second focal point side in a pair of hyperbola having a point in the vicinity of the light emission center as the second focal point, the reflected light from each of these reflectors is the first of the pair of hyperbola in the plane. The light is incident on the convex lens along the optical path substantially the same as the divergent light from one focal point. Since the first focal point is located in the vicinity of the rear focal point of the convex lens, the light emitted from the convex lens becomes light substantially parallel to the optical axis at least in the plane, thereby controlling the light distribution with high accuracy. It can be carried out.

  Moreover, since each light emitting element and each reflector are arrange | positioned ahead rather than the rear focus of a convex lens, the front-and-rear length of the vehicular illumination lamp can be shortened. Then, by turning on the plurality of light emitting elements, a sufficient amount of irradiation light can be secured.

  As described above, according to the present invention, in a vehicular illumination lamp using a light emitting element as a light source, the light distribution control can be performed with high accuracy, and the lamp is made thin and a sufficient amount of irradiation light is secured. can do. And the freedom degree of the layout of a lamp can be raised by aiming at thickness reduction of a lamp in this way.

  Moreover, in the vehicular illumination lamp according to the present invention, a plurality of spot-like light distribution patterns or elongated light distribution patterns can be formed in the front direction of the lamp by turning on a plurality of light emitting elements. The light distribution pattern can be made sufficiently bright.

  In the above-described configuration, the arrangement of the light emitting elements can be changed and the predetermined reflector can be additionally arranged as follows, with the arrangement of the convex lenses and the reflectors maintained as they are.

  That is, the first reflector that reflects the light from the light emitting element so as to converge to a predetermined point located between the light emitting element and the optical axis is disposed in the vicinity of each light emitting element, and Between each of these predetermined points and the optical axis, a second reflector that reflects the light from each light-emitting element reflected by each first reflector toward the front (ie, a reflector corresponding to the reflector having the above-described configuration) is disposed. It can be configured.

  By adopting such a configuration, the light distribution pattern formed by the light emitted from each light emitting element can be made less uneven in light distribution. Further, by adopting such a configuration, a plurality of sets of light emitting elements and first reflectors are arranged for each second reflector so that the emitted light from each set of light emitting elements converges to the predetermined point. This makes it possible to further increase the amount of irradiation light while keeping the lamp thinner.

  As described above, the “convex lens” is not limited to a lens having a specific shape in the above configuration. However, if the lens is made of a Fresnel lens, the convex lens itself can be thinned, thereby reducing the thickness of the lamp. It can be further promoted.

  In the above configuration, if the aperture ratio of the convex lens is set to a value of 1 or less, the angle between the direction of the light from each light emitting element reflected by each reflector and the optical axis can be suppressed to a relatively small value. As a result, more reflected light from each reflector can be incident on the convex lens, thereby making it possible to effectively use the light source luminous flux.

  In the above configuration, each light emitting element is supported by a metal member, and a plurality of heat radiating fins are formed on a portion of the metal member located on the outer peripheral side of each light emitting element with respect to the optical axis. If it is set as a structure, the heat | fever generate | occur | produced with lighting of each light emitting element can be moved to the metal member which has a big heat capacity by a heat conductive effect, and can be efficiently dissipated from the several radiation fin. At this time, since the plurality of heat dissipating fins are located on the outer peripheral side with respect to the light emitting elements, it is possible to obtain such an operational effect while maintaining the thinness of the lamp.

  In this case, the metal member may be configured as a plurality of members arranged for each light emitting element, but if configured as a common member that collectively supports the plurality of light emitting elements, the heat dissipation efficiency is further improved. It is possible to increase the positioning accuracy of each light emitting element.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing a vehicular illumination lamp 10 according to an embodiment of the present invention, and FIG. 2 is a side sectional view thereof.

  As shown in these drawings, the vehicular illumination lamp 10 according to this embodiment includes a convex lens 12 disposed on an optical axis Ax extending in the front-rear direction of the lamp, and four light emitting elements disposed behind the convex lens 12. 14, four reflectors 16, a light source holder 18, and a lens holder 20, and used as a lamp unit for a vehicle headlamp in a state where the optical axis is adjustable with respect to a lamp body (not shown) or the like. It is supposed to be. At this time, the vehicular illumination lamp 10 performs light irradiation for forming a part of the high beam light distribution pattern in a state where the optical axis Ax extends in the vehicle front-rear direction. Yes.

  The convex lens 12 is a plano-convex aspherical lens having a convex front surface and a flat rear surface, and is fixedly supported at the front end of the lens holder 20 at the peripheral edge thereof. The effective diameter of the convex lens 12 is defined. The aperture ratio of the convex lens 12 (that is, the ratio between the effective diameter of the convex lens 12 and its focal length) is set to a value of 1 or less (specifically, a value of about 0.8).

  The four light emitting elements 14 are arranged at equal intervals around the optical axis Ax between the convex lens 12 and the rear focal point F of the convex lens 12 on the same circumference around the optical axis Ax. Each of the light emitting elements 14 is a white light emitting diode, and includes a light emitting chip 14a having a square light emitting surface of about 1 mm square and a substrate 14b that supports the light emitting chip 14a. At that time, the light emitting chip 14a is sealed with a thin film formed to cover the light emitting surface.

  Each of the light emitting elements 14 is disposed at a position where a straight line L connecting the light emission center A and the rear focal point F of the convex lens 12 passes near the front edge of the inner peripheral surface of the lens holder 20. The light emitting elements 14 are fixedly supported by a common light source holder 18 with the light emitting chip 14a facing the optical axis Ax.

  The light source holder 18 is a metal member formed in an annular shape, and is fixedly supported by the lens holder 20 at its front end. In the light source holder 18, a plurality of heat radiating fins 18 a are formed so as to protrude toward the outer peripheral side at a portion positioned on the outer peripheral side with respect to each light emitting element 14 with respect to the optical axis Ax.

  The four reflectors 16 are respectively disposed between each of the four light emitting elements 14 and the optical axis Ax so as to cover the light emitting elements 14 in a semi-dome shape. Reflected toward the front. These four reflectors 16 are integrally formed and fixedly supported by the light source holder 18. At this time, each of the reflectors 16 is formed so that its front end edge extends to the rear surface of the convex lens 12.

  The reflecting surface 16a of each reflector 16 has a cross-sectional shape along a plane including the light emission center A and the optical axis Ax of each light emitting element 14, and the rear focal point F of the convex lens 12 is the first focal point. It is formed by a hyperbola H on the second focal point side in a pair of hyperbolas having 14 emission centers A as the second focal point (that is, with the straight line L as the axis). In the present embodiment, the reflecting surface 16a of each reflector 16 is composed of a rotating hyperboloid formed by rotating the hyperbola H about its axis.

  Most of the light emitted from each light-emitting element 14 is incident on the reflecting surface 16a of each reflector 16, is reflected forward by each of the reflecting surfaces 16a, and is incident on the convex lens 12. At this time, Since the reflecting surface 16a is constituted by the rotating hyperboloid, the light from each light emitting element 14 reflected by each reflecting surface 16a has the same optical path as the diverging light from the rear focal point F of the convex lens 12, and the convex lens 12 It will enter into. For this reason, all the light from each light emitting element 14 emitted forward from the convex lens 12 becomes light parallel to the optical axis Ax.

  FIG. 3 is a view perspectively showing a light distribution pattern PA formed on a virtual vertical screen arranged at a position 25 m ahead of the lamp by light irradiated forward from the vehicular illumination lamp 10 according to the present embodiment. is there.

  As shown in the figure, this light distribution pattern PA is a spot-shaped light distribution pattern formed around HV, which is a vanishing point in the front direction of the lamp, and is one of the high beam light distribution patterns PH. It is formed as a part. That is, a high beam light distribution pattern PH is formed as a combined light distribution pattern of this light distribution pattern PA and a diffused light distribution pattern PB formed by light irradiated forward from another lamp unit (not shown). The hot zone that is the luminous intensity region is formed by the light distribution pattern PA.

  This light distribution pattern PA is formed as a combined light distribution pattern of four light distribution patterns PA1, PA2, PA3, and PA4. Each of these light distribution patterns PA1, PA2, PA3, and PA4 is a light distribution pattern formed by lighting each light emitting element 14 arranged at each of the upper, lower, left, and right positions of the optical axis Ax. It is a pattern. This is because all the light from each light emitting element 14 emitted forward from the convex lens 12 becomes light parallel to the optical axis Ax.

  As described above in detail, the vehicular illumination lamp 10 according to the present embodiment includes the convex lens 12 disposed on the optical axis Ax extending in the front-rear direction of the lamp, and the light emitting element 14 disposed behind the convex lens 12. The light-emitting element 14 is arranged around the optical axis Ax between the convex lens 12 and the rear focal point F at equal intervals around the optical axis Ax on the same circumference. Between each of the light emitting elements 14 and the optical axis Ax, a reflector 16 that reflects light from the light emitting element 14 forward is disposed. The light emitted and incident on each reflector 16 is reflected by the reflector 16 and incident on the convex lens 12, and is deflected by the convex lens 12 and emitted forward.

  At this time, the cross-sectional shape of the reflecting surface 16a of each reflector 16 along the plane including the light emission center A and the optical axis Ax of each light emitting element 14 sets the rear focal point F of the convex lens 12 as the first focal point. Since it is formed by a hyperbola H on the second focal point side in a pair of hyperbola with the light emission center A of each light-emitting element 14 as the second focal point, the reflected light from each reflector 16 is the above-mentioned 1 The light enters the convex lens 12 through the same optical path as the divergent light from the first focal point of the pair of hyperbolas. Since the first focal point is located at the rear focal point F of the convex lens 12, light emitted from the convex lens 12 becomes light parallel to the optical axis Ax at least in the plane, thereby controlling light distribution. It can be performed with high accuracy.

  Moreover, since each light emitting element 14 and each reflector 16 are arrange | positioned ahead of the rear side focus F of the convex lens 12, the front-back length of the vehicle lamp can be shortened. Then, by turning on these four light emitting elements 14, a sufficient amount of irradiation light can be secured.

  As described above, according to this embodiment, in the vehicular illumination lamp 10 using the light emitting element 14 as a light source, the light distribution control can be performed with high accuracy, and the lamp can be thinned and sufficiently irradiated. The amount of light can be secured. And the freedom degree of the layout of a lamp can be raised by aiming at thickness reduction of a lamp in this way.

  Moreover, in the vehicular illumination lamp 10 according to the present embodiment, since the reflecting surface 16a of each reflector 16 is formed of a rotating hyperboloid, all the light from each light emitting element 14 emitted forward from the convex lens 12 is light. The light becomes parallel to the axis Ax, and thereby the light emitting elements 14 are turned on, so that spot-like light distribution patterns PA1, PA2, PA3, PA4 can be formed in the front direction of the lamp. If these four light emitting elements 14 are turned on simultaneously, the light distribution pattern PA formed as a combined light distribution pattern of these four light distribution patterns PA1, PA2, PA3, PA4 should be sufficiently bright. Can do.

  Moreover, since the aperture ratio of the convex lens 12 is set to a value of about 0.8 in the vehicular illumination lamp 10 according to the present embodiment, the direction of the light from each light emitting element 14 reflected by each reflector 16 is The angle formed with the optical axis Ax can be suppressed to a relatively small value. As a result, more reflected light from each reflector 16 can be made incident on the convex lens 12, thereby making it possible to effectively use the light source luminous flux.

  Furthermore, in the vehicular illumination lamp 10 according to the present embodiment, each light emitting element 14 is supported by a metal light source holder 18, and the light axis A in each light source holder 18 is from each light emitting element 14. Since a plurality of radiating fins 18a are formed on the outer peripheral side, the heat generated when each light emitting element 14 is turned on is transferred to the light source holder 18 having a large heat capacity by the heat conduction action. It is possible to efficiently dissipate from the plurality of radiating fins 18a. At this time, since the plurality of heat dissipating fins 18a are located on the outer peripheral side with respect to each light emitting element 14, it is possible to obtain such an effect while maintaining the thinness of the lamp. Moreover, since the four light emitting elements 14 are supported by the common light source holder 18, the heat dissipation efficiency can be sufficiently increased, and the positioning accuracy of each light emitting element 14 can be increased.

  In the above embodiment, each light emitting element 14 is described as being disposed toward the optical axis Ax. However, each light emitting element 14 is located on the rear side with respect to the direction orthogonal to the optical axis Ax. It is also possible to adopt a configuration in which it is arranged in an inclined direction. With such a configuration, even when each light emitting element 14 is arranged close to the convex lens 12, most of the emitted light from each light emitting element 14 can be incident on the reflecting surface 16 a of each reflector 16. Thus, it is possible to further promote the thinning of the lamp.

  In the above embodiment, the four light emitting elements 14 are described as being arranged at equal intervals on the same circumference around the optical axis Ax. However, these four light emitting elements 14 are arranged in the same circle. It is also possible to adopt a configuration that is arranged at a position deviating from the circumference, or a configuration that is arranged at unequal intervals in the circumferential direction.

  Further, in the above embodiment, the four light emitting elements 14 are arranged around the optical axis Ax. However, three or less or five or more light emitting elements 14 may be arranged. Is possible.

  Moreover, in the said embodiment, although demonstrated as what the aperture ratio of the convex lens 12 was set to the value of about 0.8, if this aperture ratio was set to the value of 1 or less, the said embodiment and It is possible to obtain substantially the same effect.

  In the above embodiment, the hyperbola H that forms a cross-sectional shape along the vertical plane including the optical axis Ax of the reflecting surface 16a of each reflector 16 has the rear focal point F of the convex lens 12 as the first focal point. In addition, the light emission center A of each light emitting element 14 is described as the second focal point. However, if the first and second focal points are positioned in the vicinity of the rear focal point F and the light emission center A, the convex lens 12 is used. Since the light from each light emitting element 14 emitted forward from the light becomes light substantially parallel to the optical axis Ax, it is possible to obtain substantially the same function and effect as in the above embodiment.

  Next, a first modification of the above embodiment will be described.

  FIG. 4 is a side sectional view showing the vehicular illumination lamp 110 according to this modification.

  As shown in the figure, the vehicular illumination lamp 110 according to the present modification has the same basic configuration as the vehicular illumination lamp 10 of the above embodiment, but the convex lens 112 is constituted by a Fresnel lens. This is different from the above embodiment.

  Even in the case of adopting the configuration of this modification, it is possible to obtain the same effects as those of the above embodiment. In addition, by adopting the configuration of this modification, it is possible to reduce the thickness of the convex lens 112 itself, thereby further promoting the reduction in the thickness of the lamp.

  Next, a second modification of the above embodiment will be described.

  FIG. 5 is a front view showing the vehicular illumination lamp 210 according to this modification.

  As shown in the figure, the vehicular illumination lamp 210 according to this modification has the same basic configuration as the vehicular illumination lamp 10 of the above embodiment, but the upper and lower of the four reflectors 16 and 216 are the same. The configuration of the pair of reflectors 216 is different from that of the above embodiment.

  That is, the configuration of the pair of left and right reflectors 16 is the same as that of the above embodiment, but the shape of the reflection surface 216a of the pair of upper and lower reflectors 216 is different from that of the above embodiment.

  Specifically, the reflecting surface 216a of each reflector 216 is formed with the hyperbola H in the same manner as in the above embodiment with respect to the cross-sectional shape along the vertical plane, but as in the case of the above embodiment. It is not a rotational hyperboloid, but is composed of a curved surface that is slightly expanded in the left-right direction.

  As a result, the light from each light emitting element 14 reflected by the reflecting surface 216a of each reflector 216 enters the convex lens 12 in the vertical plane along the same optical path as the diverging light from the rear focal point F of the convex lens 12. The emitted light from the convex lens 12 becomes light parallel to the optical axis Ax, but enters the convex lens 12 at a larger incident angle than the divergent light from the rear focal point F of the convex lens 12 in the horizontal plane. As a result, the light is emitted from the convex lens 12 as light that diffuses somewhat in the left-right direction.

  FIG. 6 is a view perspectively showing a light distribution pattern PC formed on a virtual vertical screen arranged at a position 25 m ahead of the lamp by light irradiated forward from the vehicular illumination lamp 210 according to this modification. is there.

  As shown in the figure, this light distribution pattern PC is a light distribution pattern that is formed slightly horizontally with HV at the center. As in the case of the above embodiment, one of the high-beam light distribution patterns PH. It is formed as a part.

  This light distribution pattern PC is formed as a combined light distribution pattern of four light distribution patterns PC1, PC2, PC3, and PC4. Each of these light distribution patterns PC1, PC2, PC3, and PC4 is a light distribution pattern formed by lighting each light emitting element 14 disposed at each of the upper, lower, left, and right positions of the optical axis Ax. At this time, the light distribution pattern PC3 , PC4 is a spot-like light distribution pattern similar to the light distribution patterns PA3, PA4 in the above embodiment, but the light distribution patterns PC1, PC2 are the same as the light distribution patterns PA1, PA2 in the left-right direction. The light distribution pattern is slightly expanded.

  This is because, of the light from each light emitting element 14 emitted forward from the convex lens 12, all the reflected light from the reflecting surfaces 16a of the pair of left and right reflectors 16 becomes light parallel to the optical axis Ax. Thus, the reflected light from the reflecting surface 216a of each pair of upper and lower reflectors 216 is light that is parallel to the optical axis Ax in the vertical direction and diffuses in the horizontal direction in the horizontal direction. is there.

  By adopting the configuration of this modified example, a slightly long light distribution pattern can be obtained as the light distribution pattern PC for forming the hot zone of the high beam light distribution pattern PH. The visibility can be improved by irradiating a wide area.

  Next, a third modification of the above embodiment will be described.

  FIG. 7 is a front view showing a vehicular illumination lamp 310 according to the present modification, and FIG. 8 is a side sectional view showing an essential part thereof.

  As shown in these drawings, the vehicular illumination lamp 310 according to the present modification has the same basic configuration as the vehicular illumination lamp 10 of the above embodiment, but the arrangement of the light emitting elements 14 is the above implementation. It differs from the case of a form, and also differs from the case of the said embodiment also in the point by which reflectors 322A and 322B are additionally arranged.

  That is, in this modification, each reflector 16 has the same configuration as in the above embodiment, but each light emitting element 14 is located at the light emission center A of each light emitting element 14 in the above embodiment. It is arranged at two positions before and after the predetermined point B which is a point (that is, at a position away from the optical axis Ax). A pair of front and rear reflectors 322A and 322B are arranged in the vicinity of the pair of front and rear light emitting elements 14, respectively. At this time, each of the reflectors 322A and 322B is configured as a “first reflector” to reflect the light from each light emitting element 14 so as to converge at a predetermined point B. In order to realize this, the reflecting surfaces 322Aa and 322Ba of the reflectors 322A and 322B are spheroidal surfaces having the light emission centers Aa and Ab of the light emitting elements 14 as the first focal point and the predetermined point B as the second focal point. Is formed.

  In this modification, the reflector 16 is disposed as a “second reflector” between the predetermined point B and the optical axis Ax, and is reflected by the reflectors 322A and 322B by the reflector 16 to be the predetermined point B. Then, the light from each light emitting element 14 incident on the reflector 16 as diverging light from the predetermined point B after being converged once is reflected forward.

  In this modification, the shape of the light source holder 318 that fixes and supports each light emitting element 14 is partially different from that in the above embodiment.

  That is, the light source holder 318 of the present modification is configured as a metal member formed in an annular shape like the light source holder 18 of the above embodiment, and the four reflectors 16 are fixedly supported by the lens holder 20. Although it is fixedly supported, it is fixedly supported with the pair of front and rear light emitting elements 14 being back-to-back in the front and rear direction at four locations in the circumferential direction, and the pair of front and rear reflectors 322A and 322B are faced in the front and rear direction. It is fixed and supported in the state.

  In the light source holder 318 as well, a plurality of heat radiating fins 318a are formed so as to protrude toward the outer peripheral side in a portion located on the outer peripheral side with respect to the optical axis Ax.

  The light distribution pattern formed by the irradiation light from the vehicular illumination lamp 310 according to the present modification has substantially the same shape as the light distribution pattern PA formed in the above embodiment. The light emitted from each light emitting element 14 is reflected twice by the reflectors 322A, 322B and the reflector 16 and then enters the convex lens 12, so that each light distribution pattern formed thereby is formed in the case of the above embodiment. Each light distribution pattern PA1, PA2, PA3, PA4 can be less uneven in light distribution.

  In addition, in the vehicular illumination lamp 310 according to this modification, two sets of the light emitting elements 14 and the first reflectors 322A and 322B are arranged for each reflector 16, and the light emitted from each of the sets of light emitting elements 14 is arranged. Since the incident light is converged to the predetermined point B, it is possible to further increase the amount of irradiation light while keeping the lamp thin, and thereby the light distribution pattern formed in the case of the above embodiment. A light distribution pattern brighter than PA can be formed.

  Instead of the configuration in which the two sets of light emitting elements 14 and the first reflectors 322A and 322B are arranged as in the present modification, it is also possible to have a configuration in which only one of the sets is arranged. .

  Next, the 4th modification of the said embodiment is demonstrated.

  FIG. 9 is a front view showing a vehicular illumination lamp 410 according to this modification.

  As shown in the figure, the vehicular illumination lamp 410 according to the present modification has a configuration obtained by further developing the configuration of the third modification.

  That is, in this modification, the front and rear pair of light emitting elements 14 and the front and rear pair of reflectors 322A and 322B that are arranged at the four circumferential positions in the third modification are adjacent to each other in the circumferential direction. In this configuration, two sets are arranged. At that time, the two reflectors 422A located on the front side are arranged in a state slightly inclined in the circumferential direction toward the predetermined point B. The same applies to the two reflectors (not shown) located on the rear side. Accordingly, the light source holder 418 of the present modification is partially different from the case of the third modification in the shape of the reflector support portion, and the number of the plurality of heat radiation fins 418a protruding toward the outer peripheral side. Is larger than in the case of the third modification.

  By adopting the configuration of the present modified example, it is possible to further increase the amount of irradiation light compared to the case of the third modified example, while maintaining a thinner lamp.

  In addition, the numerical value shown as a specification in the said embodiment and each modification is only an example, and of course, you may set these to a different value suitably.

Front view showing a vehicular illumination lamp according to an embodiment of the present invention 1 is a side sectional view of FIG. The figure which shows transparently the light distribution pattern formed on the virtual vertical screen arrange | positioned in the position of 25 m ahead of the lamp | ramp by the light irradiated ahead from the said lighting lamp for vehicles Side sectional view which shows the illuminating lamp for vehicles which concerns on the 1st modification of the said embodiment. The front view which shows the vehicle lighting device which concerns on the 2nd modification of the said embodiment. The figure which shows in perspective the light distribution pattern formed on the said virtual vertical screen by the light irradiated ahead from the vehicle lighting device which concerns on the said 2nd modification. The front view which shows the vehicle lighting device which concerns on the 3rd modification of the said embodiment. Side sectional view showing the vehicular illumination lamp according to the third modified example The front view which shows the vehicle lighting device which concerns on the 4th modification of the said embodiment.

Explanation of symbols

10, 110, 210, 310, 410 Vehicle illumination lamp 12, 112 Convex lens 14 Light emitting element 14a Light emitting chip 14b Substrate 16, 216, 322A, 322B, 422A Reflector 16a, 216a, 322Aa, 322Ba Reflecting surface 18, 318, 418 Light source Holder 18a, 318a, 418a Radiation fin 20 Lens holder A, Aa, Ab Light emission center Ax Optical axis B Predetermined point F Rear focus H Hyperbola L Straight line PA, PA1, PA2, PA3, PA4, PC, PC1, PC2, PC3, PC4 Light distribution pattern PB Diffuse light distribution pattern PH High beam light distribution pattern

Claims (5)

In a vehicular illumination lamp comprising a convex lens arranged on an optical axis extending in the front-rear direction of the lamp, and a light emitting element arranged behind the convex lens,
A plurality of the light emitting elements are arranged around the optical axis between the convex lens and the rear focal point of the convex lens at a predetermined interval in the circumferential direction around the optical axis,
Between each of the light emitting elements and the optical axis, a reflector that reflects light from the light emitting elements forward is disposed, respectively.
A cross-sectional shape of the reflecting surface of each reflector along a plane including the light emission center of each light emitting element and the optical axis is a point near the rear focal point of the convex lens as a first focus, and each light emitting element. A vehicular illumination lamp characterized in that it is formed by a hyperbola on the second focal point side in a pair of hyperbolic curves having a point near the light emission center as a second focal point. In a vehicular illumination lamp comprising a convex lens arranged on an optical axis extending in the front-rear direction of the lamp, and a light emitting element arranged behind the convex lens,
A plurality of the light emitting elements are arranged around the optical axis between the convex lens and the rear focal point of the convex lens at a predetermined interval in the circumferential direction around the optical axis,
In the vicinity of each of these light emitting elements, a first reflector for reflecting the light from the light emitting element so as to converge at a predetermined point located between the light emitting element and the optical axis is arranged, respectively.
Between each of these predetermined points and the optical axis, a second reflector that reflects light from each of the light emitting elements reflected by the first reflector toward the front is disposed, respectively.
The cross-sectional shape of the reflecting surface of each of the second reflectors along the plane including the predetermined points and the optical axis is a point near the rear focal point of the convex lens as the first focal point and a point near the predetermined points. A vehicular illumination lamp characterized by being formed by a hyperbola on the second focal point side in a pair of hyperbola having a second focal point.   The vehicular illumination lamp according to claim 1 or 2, wherein the convex lens is composed of a Fresnel lens.   The vehicular illumination lamp according to any one of claims 1 to 3, wherein an aperture ratio of the convex lens is set to a value of 1 or less. Each light emitting element is supported by a metal member,
5. The vehicle-use vehicle according to claim 1, wherein a plurality of heat radiation fins are formed in a portion of the metal member that is located on the outer peripheral side of the light emitting elements with respect to the optical axis. Lighting lamp.

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