JP2012243735A - Lamp fitting for vehicle - Google Patents

Abstract

It is important to effectively use light from one semiconductor-type light source.
The present invention includes a single semiconductor light source, a light guide member, and a reflector. The light guide member 5 is provided with incident surfaces 13, 14, 15, a first reflecting surface 16, a second reflecting surface 17, and an exit surface 18. The second reflecting surface 17 is formed by rotating a parabola P having an axis of symmetry O2 parallel to the parallel reflected light L2, passing through the focal point F3 of the parabola P, and having an axis parallel to the parallel incident light L1 as the rotation axis O1. It consists of a rotating paraboloid. The exit surface 18 is a part of a spherical surface centered on the focal point F3 of the parabola P. As a result, the present invention can effectively use the light from one semiconductor-type light source 4.
[Selection] Figure 1

Description

  The present invention relates to a vehicular lamp that controls light distribution of light emitted from one semiconductor-type light source with a reflector via a light guide member (light guide).

  This type of vehicular lamp is conventionally known (for example, Patent Document 1). Hereinafter, a conventional vehicle lamp will be described. A conventional vehicular lamp includes one LED, a light guide, a reflector, and a front lens. The light guide is provided with an entrance surface, a first exit surface, a reflection surface, and a second exit surface. By guiding light from one LED to almost the entire reflector through the light guide, almost the entire front lens emits light.

  In such a vehicular lamp, it is important to use light from one LED effectively.

JP 2004-273353 A

  The problem to be solved by the present invention is that it is important to effectively use light from one semiconductor-type light source.

  The present invention (the invention according to claim 1) includes one semiconductor-type light source, a light guide member, and a reflector, and the light guide member receives light from one semiconductor-type light source. An incident surface that is incident as parallel light therein, a first reflective surface that reflects parallel incident light incident from the incident surface as parallel light, and a second reflective surface that reflects parallel reflected light from the first reflective surface as radiated light And an exit surface that emits the radiation reflected light from the second reflecting surface to the reflector side, and the second reflecting surface has a parabola whose symmetry axis is parallel to the parallel reflected light, and the focal point of the parabola. And a rotating paraboloid that is rotated about an axis parallel to the parallel incident light, and the exit surface is part of a spherical surface centered on the focal point of the parabola. .

  This invention (the invention according to claim 2) is characterized in that the first reflecting surface and the second reflecting surface are made of reflecting surfaces that totally reflect light.

  In the vehicular lamp according to the present invention (the invention according to claim 1), when one semiconductor light source is turned on, light emitted from one semiconductor light source enters the light guide member as parallel light from the incident surface. The parallel incident light is reflected as parallel light by the first reflecting surface, the parallel reflected light is reflected as radiated light by the second reflecting surface, and the radiated reflected light is emitted from the emitting surface to the reflector side, thereby As if the light from the light source located at the focal point of the parabola is radiated to the reflector side. As described above, the vehicular lamp of the present invention (the invention according to claim 1) can suppress the internal reflectance to be low particularly on the light exit surface of the light guide member. The light from one semiconductor type light source can be used effectively. In other words, the light (radiation reflected light) emitted from the exit surface composed of a part of the spherical surface appears as if it is emitted from the center of the spherical surface of the exit surface (the focal point of the parabola). (Reflected light) is perpendicular to the exit surface composed of a part of a spherical surface. As a result, the light (radiation reflected light) emitted from the emission surface formed of a part of the spherical surface is efficiently emitted with the internal reflectance on the emission surface being suppressed low.

  In the vehicular lamp of the present invention (the invention according to claim 2), since the first reflection surface and the second reflection surface are made of reflection surfaces that totally reflect light, the internal reflectance can be increased as much as possible. Attenuation (loss, decrease) of light emitted from one semiconductor-type light source can be suppressed as much as possible. That is, the vehicular lamp according to the present invention (the invention according to claim 2) can further effectively use the light emitted from one semiconductor-type light source.

  Moreover, in the vehicular lamp of the present invention (the invention according to claim 2), the first reflecting surface and the second reflecting surface are formed by the first reflecting surface and the second reflecting surface that totally reflect light. Since it is not necessary to deposit aluminum (metal) deposition, silver coating, metal plating, etc. on the surface, the manufacturing is simple, and the manufacturing cost can be reduced accordingly.

FIG. 1 is an explanatory view of an optical path of a light guide action of a light guide member showing a vehicle lamp according to a first embodiment of the present invention. FIG. 2 is also an explanatory view of the incident surface, the first reflecting surface, the second reflecting surface, and the emitting surface of the light guide member. FIG. 3 is also an explanatory view showing an incident optical path on the incident surface of the light guide member. FIG. 4 is a perspective view showing the light guide member. FIG. 5 is a longitudinal sectional view (vertical sectional view) schematically showing the internal structure of the vehicular lamp. FIG. 6 is an explanatory view of an incident light path on the incident surface of the light guide member showing the vehicle lamp according to the second embodiment of the present invention. FIG. 7 is an explanatory diagram of an incident light path on the incident surface of the light guide member showing the vehicle lamp according to the third embodiment of the present invention.

  Hereinafter, three examples of the embodiments of the vehicular lamp according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Description of configuration)
1 to 5 show Example 1 of a vehicular lamp according to the present invention. Hereinafter, the configuration of the vehicular lamp in the first embodiment will be described. In the figure, reference numeral 1 denotes a vehicular lamp (for example, a vehicular lamp such as a tail lamp, a stop lamp, a tail / stop lamp, a turn signal lamp, a clearance lamp, a daytime running lamp).

  As shown in FIG. 5, the vehicular lamp 1 includes a lamp housing 2, a lamp lens 3, a single semiconductor light source 4, a light guide member (light guide) 5, and a reflector 6. Is.

  The lamp housing 2 and the lamp lens 3 define a lamp chamber 7. In the lamp chamber 7, the one semiconductor-type light source 4, the light guide member 5, and the reflector 6 are arranged. The one semiconductor-type light source 4, the light guide member 5, and the reflector 6 are attached to the lamp housing 2 via a mounting bracket 8.

  The reflector 6 has a shape in which the front side is open and the back side is closed. A reflective surface 9 is provided on at least the front surface of the reflector 6. A through hole 10 is provided at the center of the reflector 6.

  The one semiconductor light source 4 is composed of one lamp unit. In this example, the one semiconductor-type light source 4 uses a self-luminous semiconductor-type light source such as an LED or an EL (organic EL), that is, a semiconductor-type light source (LED in this embodiment).

  The one semiconductor-type light source 4 encloses a substrate (not shown), one or a plurality of light emitting chips (not shown) appropriately disposed on the substrate, and the light emitting chip. And a sealing resin member (not shown) to be stopped.

  The one semiconductor light source 4 is attached to the mounting bracket 8 via a holder member (not shown). The one semiconductor light source 4 is supplied with power (current) via a connector portion (not shown) of the holder member. The mounting bracket 8 may also serve as a heat sink member. The one semiconductor-type light source 4 is a type that is attached to the lamp housing 2 via the mounting bracket 8, but is a socket type that is attached to the lamp housing 2 via a socket (not shown). Also good.

  The light guide member 5 is made of a transparent resin material such as a member having a property of guiding light, in this example, PC (polycarbonate), PMMA (polymethyl methacrylate, methacrylic resin). It does not matter whether it is colored or colorless. As shown in FIGS. 4 (A) and 4 (B), the light guide member 5 is provided integrally with a cylindrical portion 11 having the rotation axis O1 as an axis and one end portion of the cylindrical portion 11, And a disk portion 12 having the rotation axis O1 as an axis.

  The other end of the cylindrical portion 11 constitutes a light incident portion. A portion of the disk portion 12 on the cylindrical portion 11 side constitutes a light emitting portion. Of the cylindrical part 11 and the disk part 12, the light incident part and the light emitting part constitute an optical part. The other end of the cylindrical portion 11 of the light guide member 5 is inserted into the through hole 10 of the reflector 6 or is fixed to the inner peripheral surface of the through hole 10 of the reflector 6. .

  As shown in FIGS. 1 to 5, incident surfaces 13, 14, and 15 are provided on the surface of the light incident portion that faces the one semiconductor light source 4. The incident surfaces 13, 14, and 15 allow the light L <b> 1 from the one semiconductor-type light source 4 to enter the light guide member 5 as parallel light (parallel incident light) L <b> 1. The incident surface includes a convex lens surface 13 having a focal point F1 located on the rotational axis O1, a paraboloid 14 having a focal point F2 located on the rotational axis O1, and a cylindrical surface 15 having the rotational axis O1 as an axis. It consists of.

  The one semiconductor light source 4 is located at or near the focal point F1 of the convex lens surface 13. The focal point F1 of the convex lens surface 13 and the focal point F2 of the rotary paraboloid 14 are light L1 from the one semiconductor-type light source 4, and the light L1 reflected by the rotary paraboloid 14 is The refraction is shifted when the light enters the light guide member 5 from the cylindrical surface 15.

  A first reflecting surface 16 is provided at the center of the light guide portion on the opposite side of the disc portion 12 from the cylindrical portion 11 side. The first reflecting surface 16 reflects the parallel incident light L1 incident from the incident surfaces 13, 14, 15 as parallel light (parallel reflected light) L2. The first semiconductor-type light source inclined surface 16 is formed of a conical surface having an apex angle of 90 ° that is rotated about the rotation axis O1.

  A second reflecting surface 17 is provided in a peripheral portion of the light guide portion on the side opposite to the cylindrical portion 11 side of the disk portion 12. The second reflecting surface 17 reflects the parallel reflected light L2 from the first reflecting surface 16 as radiated light (radiated reflected light) L3. The second reflecting surface 17 passes through a parabola P whose symmetry axis O2 is parallel to the parallel reflected light L2, passes through the focal point F3 of the parabola P, and is parallel to the parallel incident light L1, that is, the rotation. It consists of a paraboloid of rotation formed by rotating the axis O1 as a rotation axis.

  An exit surface 18 is provided on a surface of the light emitting portion that faces the reflecting surface 9 of the reflector 6. The emitting surface 18 emits the radiation reflected light L3 from the second reflecting surface 17 to the reflecting surface 9 side of the reflector 6. The exit surface 18 is a part of a spherical surface centered on the focal point F3 of the parabola P.

  The first reflection surface 16 and the second reflection surface 17 are reflection surfaces that totally reflect light. The reflecting surface 9 of the reflector 6 is a parabolic free-form surface having the focal point F3 of the parabola P as a focal point.

(Description of action)
The vehicular lamp 1 according to the first embodiment is configured as described above, and the operation thereof will be described below.

  One semiconductor light source 4 of the vehicular lamp 1 is turned on. Then, the light L1 is emitted from one semiconductor light source 4. As shown in FIGS. 1 to 3 and 5, the light L <b> 1 enters the light guide member 5 as parallel light (parallel incident light) L <b> 1 parallel to the rotation axis O <b> 1 from the incident surfaces 13, 14, and 15.

  The parallel incident light L1 incident on the light guide member 5 is parallel light (parallel reflected light) parallel to the symmetry axis O2 of the parabola P on the first reflecting surface 16, as shown in FIGS. ) Reflected to the second reflecting surface 17 side as L2. The parallel reflected light L2 is reflected by a uniform light beam in the same direction over the entire circumference (360 °) of the rotation axis O1.

  The parallel reflected light L2 from the first reflecting surface 16 is radiated light (radiated reflected light) having the focal point F3 of the parabola P as the light source on the second reflecting surface 17, as shown in FIGS. It is reflected to the exit surface 18 side as L3. The radiation reflected light L3 is reflected by a uniform light beam in the same direction over the entire circumference (360 °) of the rotation axis O1.

  The radiation reflected light L3 from the second reflecting surface 17 is emitted from the emitting surface 18 to the reflecting surface 9 side of the reflector 6, as shown in FIGS. As shown in FIGS. 1 and 5, the radiation reflected light L3 emitted from the emission surface 18 is as light emitted from a light source located at the focal point F3 of the parabola P, that is, the focal point of the reflection surface 9 of the reflector 6. The reflected light L4 that is parallel or substantially parallel to the rotation axis O1 is reflected on the lamp lens 3 side over substantially the entire reflecting surface 9 of the reflector 6.

  Reflected light L4 parallel to or substantially parallel to the rotation axis O1 from the reflecting surface 9 of the reflector 6 is subjected to light distribution control in a predetermined light distribution pattern and is irradiated from the lamp lens 3 to the outside.

(Explanation of effect)
The vehicular lamp 1 according to the first embodiment is configured and operated as described above, and the effects thereof will be described below.

  In the vehicular lamp 1 according to the first embodiment, the radiation reflected light L3 emitted from the emission surface 18 is emitted as if emitted from a light source located at the focal point F3 of the parabola P, that is, the focal point of the reflection surface 9 of the reflector 6. The light is reflected over substantially the entire reflecting surface 9 of the reflector 6. As described above, the vehicular lamp of the present invention (the invention according to claim 1) can suppress the internal reflectance to be low particularly in the light exit surface 18 of the light guide member 5, and accordingly, the light is guided to the light guide member 5. The light can be efficiently emitted from the light exit surface 18, and light from one semiconductor light source 4 can be effectively used. That is, the radiation reflected light L3 emitted from the emission surface 18 that is a part of the spherical surface appears as if it is emitted from the center of the spherical surface of the emission surface 18 (the focal point F3 of the parabola P). The reflected light L3 is perpendicular to the emission surface 18 formed of a part of a spherical surface. As a result, the radiation reflected light L3 emitted from the emission surface 18 which is a part of the spherical surface is radiated efficiently with the internal reflectance at the emission surface 18 being suppressed low.

  Since the vehicle lamp 1 according to the first embodiment includes the first reflecting surface 16 and the second reflecting surface 17 made of a reflecting surface that totally reflects light, the internal reflectance can be increased as much as possible. The attenuation (loss, decrease) of light emitted from the semiconductor-type light source 4 can be suppressed as much as possible. That is, the vehicular lamp 1 according to the first embodiment can more effectively utilize the light emitted from one semiconductor light source 4.

  In addition, the vehicular lamp 1 according to the first embodiment includes the first reflecting surface 16 and the second reflecting surface 17 because the first reflecting surface 16 and the second reflecting surface 17 are reflecting surfaces that totally reflect light. Since there is no need to perform aluminum (metal) deposition, silver coating, metal plating, etc., the manufacturing is simple and the manufacturing cost can be reduced accordingly.

(Description of Example 2)
FIG. 6 shows Embodiment 2 of the vehicular lamp according to the present invention. Hereinafter, the vehicular lamp in the second embodiment will be described. In the figure, the same reference numerals as those in FIGS. 1 to 5 denote the same components.

  The incident surface 19 of the light incident portion of the light guide member 50 of the vehicle lamp of the second embodiment is a convex lens surface with the focal point F4 positioned on the rotation axis O1. The incident surface 19 of the second embodiment guides light L1 from one semiconductor-type light source 4 as parallel light L1 in the same manner as the incident surfaces 13, 14, 15 of the vehicular lamp 1 of the first embodiment. The light is incident on the member 50.

  Since the vehicular lamp according to the second embodiment is configured as described above, it is possible to achieve substantially the same operational effects as the vehicular lamp 1 according to the first embodiment.

(Description of Example 3)
FIG. 7 shows Embodiment 3 of the vehicular lamp according to the present invention. Hereinafter, the vehicular lamp in the third embodiment will be described. In the figure, the same reference numerals as those in FIGS. 1 to 6 denote the same components.

  The incident surface 20 of the light incident part of the light guide member 51 of the vehicle lamp of the third embodiment is formed by a Fresnel lens surface with the focal point F5 located on the rotation axis O1. The incident surface 20 of the third embodiment is configured to collimate light L1 from one semiconductor-type light source 4 in the same manner as the incident surfaces 13, 14, 15, 19 of the vehicular lamp 1 of the first and second embodiments. The light is incident on the light guide member 51 as L1.

  Since the vehicular lamp according to the third embodiment is configured as described above, substantially the same functions and effects as those of the vehicular lamp 1 according to the first and second embodiments can be achieved.

(Description of examples other than Examples)
In the above-described embodiment, since one semiconductor light source 4 is used, the lamp is basically used as a one-function lamp, for example, a stop lamp or a tail lamp. However, in the present invention, by switching the intensity of light emitted from one semiconductor light source 4, it can be used as a dual-function lamp, for example, a tail / stop lamp.

  Moreover, in the said Example, the 1st reflective surface 16 and the 2nd reflective surface 17 consist of a reflective surface which totally reflects light. However, in the present invention, the first reflecting surface and the second reflecting surface may not be reflecting surfaces that totally reflect light. In this case, aluminum (metal) deposition, silver coating, metal plating, or the like is applied to the first reflecting surface and the second reflecting surface.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Lamp housing 3 Lamp lens 4 Semiconductor type light source 5, 50, 51 Light guide member 6 Reflector 7 Lamp chamber 8 Mounting bracket 9 Reflecting surface 10 Through-hole 11 Cylindrical part 12 Disk part 13, 14, 15, 19, 20 incident surface 16 first reflecting surface 17 second reflecting surface 18 emitting surface O1 rotation axis O2 symmetry axis L1 parallel incident light L2 parallel reflected light L3 radiation reflected light L4 reflected light F1, F2, F3, F4, F5 focus P parabola

Claims (2)

One semiconductor type light source, a light guide member, and a reflector,
The light guide member has an incident surface on which light from the one semiconductor-type light source enters the light guide member as parallel incident light, and the parallel incident light incident from the incident surface is reflected as parallel reflected light. A first reflecting surface to be reflected, a second reflecting surface for reflecting the parallel reflected light from the first reflecting surface as radiation reflected light, and an emission for emitting the radiation reflected light from the second reflecting surface to the reflector side. Each has a surface,
The second reflecting surface is a rotating paraboloid formed by rotating a parabola whose symmetry axis is parallel to the parallel reflected light, passing through the focal point of the parabola and having an axis parallel to the parallel incident light as a rotation axis. Consists of
The exit surface consists of a part of a spherical surface centered on the focal point of the parabola
A vehicular lamp characterized by the above. The first reflection surface and the second reflection surface are made of a reflection surface that totally reflects light.
The vehicular lamp according to claim 1.

Images