JP6028487B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp including a light source and an aspheric lens.

  This type of vehicular lamp is conventionally known (for example, Patent Document 1). A conventional vehicular lamp is a projector-type lamp that includes a light source (light emitting element), an aspherical lens projection lens that has a shape that is cut off horizontally, and a reflector. In a conventional vehicle lamp, light from a light-emitting element that is a light source is reflected by a reflector, and the reflected light is transmitted through a projection lens to be irradiated outside, that is, in front of the vehicle, as a low beam light distribution pattern. The conventional vehicular lamp can suppress the spectral color that appears in the vicinity of the cut-off line of the low beam light distribution pattern by cutting off the upper portion of the projection lens.

JP 2011-243474 A

  However, the conventional vehicular lamp can suppress the spectral color that appears near the cut-off line of the low-beam light distribution pattern, but is provided with means for preventing the sunlight from concentrating at a certain position below the projection lens. Not.

  The problem to be solved by the present invention is that the conventional vehicular lamp is not provided with means for preventing the sunlight from being concentrated at a certain position below the projection lens.

  The present invention (invention according to claim 1) includes a light source having a light emitting surface, and an aspherical lens that irradiates the light from the light emitting surface of the light source to the outside in a predetermined light distribution pattern. A processing unit that diffuses or shields sunlight is provided in a range other than the range in which the light distribution pattern is irradiated and in a range in which sunlight is incident.

  In this invention (the invention according to claim 2), the light source is a semiconductor-type light source, the lens is a projection lens, and includes a reflector, and the reflector has a first focal point located at or near the light-emitting surface of the semiconductor-type light source. A reflecting surface based on a spheroidal surface is provided, the light emitting surface of the semiconductor-type light source faces upward and faces the reflecting surface, and the processing unit is provided above the projection lens. It is characterized by that.

  This invention (the invention according to claim 3) is characterized in that the upper part of the projection lens is cut off and the processing section is provided at least on the cut surface of the upper part of the projection lens.

  This invention (invention according to claim 4) is characterized in that the lens is made of a resin lens, and the processing section is composed of a small uneven group for diffusing sunlight.

  In the vehicular lamp according to the present invention, a processing unit for diffusing or shielding sunlight is provided in a range other than the range in which the light distribution pattern is irradiated and the range in which sunlight is incident. It is what. For this reason, even if sunlight is incident on the lens, the processing unit diffuses or shields the sunlight. As a result, it is possible to prevent sunlight from being concentrated at a certain position below the lens.

FIG. 1 is a partial longitudinal sectional view (partially vertical sectional view) showing a first embodiment of a vehicular lamp according to the present invention. FIG. 2 is a partial longitudinal cross-sectional explanatory view (partially vertical cross-sectional explanatory view) showing a range in which a processing unit is provided. FIG. 3 is an explanatory diagram of an optical path of sunlight. FIG. 4 is a partial longitudinal sectional view (partially vertical sectional view) showing Embodiment 2 of the vehicular lamp according to the present invention.

  Below, two examples of embodiment (example) of the vehicular lamp concerning this invention are explained in detail based on a drawing. In addition, this invention is not limited by this embodiment. In FIGS. 1, 2, and 4, the hatching of the lens is omitted. In this specification and claims, front, back, up, down, left, and right are front, back, up, down, left, and right when the vehicle lamp according to the present invention is mounted on a vehicle. is there.

(Description of Configuration of Embodiment 1)
1 to 3 show Embodiment 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 this example, for example, a headlamp of an automotive headlamp will be described.

(Description of vehicle lamp 1)
In the figure, reference numeral 1 denotes a vehicular lamp in the first embodiment. The vehicle lamp 1 is mounted on both the left and right sides of the front portion of the vehicle. As shown in FIGS. 1 to 3, the vehicle lamp 1 includes a lamp housing (not shown), a lamp lens (not shown), a light source 2, a lens 3, a reflector 4, and a heat sink member 5. A shade 6 and an inner panel (inner housing) 7.

  The lamp housing and the lamp lens (for example, a transparent outer lens) define a lamp chamber (not shown). The light source 2, the lens 3, the reflector 4, the heat sink member 5, and the shade 6 constitute a projector type lamp unit. The lamp units 2, 3, 4, 5, 6 are disposed in the lamp chamber, and include an up / down direction optical axis adjustment mechanism (not shown) and a left / right direction optical axis adjustment mechanism (not shown). And is attached to the lamp housing. Similarly, the inner panel 7 is disposed in the lamp chamber and attached to the lamp housing.

(Description of heat sink member 5)
The heat sink member 5 is made of a material having high thermal conductivity such as resin or metal die casting (aluminum die casting). The heat sink member 5 is composed of an upper horizontal plate portion and a plurality of fin-shaped portions integrally provided from the lower surface of the horizontal plate portion. The heat sink member 5 also serves as an attachment member for attaching the light source 2, the lens 3, the reflector 4, and the shade 6.

(Description of reflector 4)
The reflector 4 is made of, for example, a material having high thermal conductivity such as a resin member or metal die-casting (aluminum die-casting) and a light-impermeable material. The reflector 4 is attached to the heat sink member 5. The reflector 4 has a hollow shape in which a front portion and a lower portion are open, and a rear portion, an upper portion, and left and right side portions are closed. On the concave inner surface of the closed portion of the reflector 4, a reflecting surface 40 made of a free-form surface based on a spheroid is provided.

  The reflection surface 40 is composed of a free-form surface. For this reason, the first focal point F1 and the second focal point (or the second focal line) F2 of the reflective surface 40 do not have a single focal point in a strict sense, but a plurality of reflective surfaces are mutually connected. The difference in focal length is small and shares almost the same focal point. Therefore, in this specification and drawings, they are simply referred to as a first focus and a second focus. Further, the reflection surface 40 has an optical axis (not shown) connecting the first focal point F1 and the second focal point F2.

(Description of light source 2)
In this example, the light source 2 uses a semiconductor light source such as a light-emitting semiconductor light source (LED in this embodiment 1) such as an LED or an EL (organic EL). The light source 2 includes a light emitting unit 20 having a light emitting surface and a substrate unit 21. The light source 2 is attached to the upper surface of the horizontal plate portion of the heat sink member 5 via the substrate portion 21. The light emitting surface of the light emitting unit 20 of the light source 2 is located at or near the first focal point F1 of the reflecting surface 40 of the reflector 4. The light emitting surface of the light emitting unit 20 of the light source 2 faces upward and faces the reflecting surface 40 of the reflector 4.

(Description of lens 3)
The lens 3 is made of a resin lens such as a PC material, a PMMA material, or a PCO material. That is, since the light emitted from the light source 2 does not have high heat, a resin lens can be used as the lens 3. The lens 3 is attached to the heat sink member 5 via a holder (not shown).

  The lens 3 irradiates the light from the light emitting surface of the light source 2 to the outside, that is, the front of the vehicle in a predetermined light distribution pattern, in this example, a low beam light distribution pattern (not shown). The lens 3 is a projection lens based on an aspherical surface. The lens 3 includes a rear entrance surface 30 and a front exit surface 31. The incident surface 30 faces the reflecting surface 40 of the reflector 4. The incident surface 30 is substantially flat or aspherical (convex or concave with respect to the reflecting surface 40). The exit surface 31 is an aspherical convex surface.

  A lens focal point F3 of the lens 3 (a meridional image plane that is a focal plane on the object space side) coincides with or substantially coincides with the second focal point F2 of the reflecting surface 40. The lens axis (not shown) of the lens 3 and the optical axis of the reflecting surface 40 are coincident or substantially coincide.

  Of the lens 3, the upper part 32 (see the two-dot chain line in FIG. 1) is cut off. As shown in FIG. 2, the excised portion (upper part) 32 of the lens 3 is indicated by a solid line in FIG. 1 in the range in which the light distribution pattern for low beam is irradiated. This is a portion existing in a range H1 other than (range) and in a range H2 in which sunlight LS (see FIG. 3) is incident.

(Description of processing unit 8)
A processing unit 8 that diffuses or shields sunlight LS is provided in a range H1 other than the range in which the low-beam light distribution pattern is irradiated and in a range H2 in which sunlight LS is incident. It has been.

  In this example, the processing unit 8 includes a cut surface of the upper part 32 of the lens 3 (see the small triangular irregularities of the solid line in FIG. 1) and the vicinity of the upper part 32 of the exit surface 31 of the lens 3 ( 1 (see the irregularities of the broken small triangles in FIG. 1). In this example, the processing unit 8 includes a small uneven group (a diffusion prism group) that diffuses sunlight LS.

(Description of shade 6)
The shade 6 is composed of a light impermeable member. The shade 6 is disposed between the reflector 4 and the light source 2 and the lens 3. The shade 6 is attached to the heat sink member 5. The shade 6 shields a part of the reflected light which is the light from the light source 2 and reflected by the reflecting surface 40 of the reflector 4, and the unshaded reflected light passes through the lens 3. The low beam light distribution pattern having a cut-off line (not shown) and an elbow point (not shown) is formed. The shade 6 is provided with an edge. The edges form the cut-off line and elbow points.

(Description of inner panel 7)
The inner panel 7 is composed of a light impermeable member. The inner panel 7 is disposed between the lamp units 2, 3, 4, 5, 6 and the lamp housing and the lamp lens. In the drawing, the inner panel 7 is disposed below the lamp units 2, 3, 4, 5, 6. The inner panel 7 covers the structure of the lamp units 2, 3, 4, 5, 6, the optical axis adjustment mechanism for the vertical direction and the optical axis adjustment mechanism for the horizontal direction, and other structures, This prevents the structure from being seen through the lamp lens and improves the appearance. The inner panel 7 also constitutes a design (design) in the lamp chamber.

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

  The light source 2 is turned on to emit light. Then, the light L1 emitted from the light source 2 is reflected by the reflecting surface 40 of the reflector 4 toward the lens 3 and the shade 6. Part of the reflected light is shielded by the shade 6. The remaining reflected light L1 that has not been shielded passes through the lens 3 and is irradiated outside, that is, in front of the vehicle, as a low beam light distribution pattern.

  On the other hand, part of the sunlight LS LS1 enters the lens 3 from the exit surface 31 of the lens 3 and is reflected by the entrance surface 30 of the lens 3. The reflected sunlight is emitted to the outside again from the emission surface 31 of the lens 3 as outgoing sunlight LS10. A small amount of the emitted sunlight LS10 is concentrated at a certain position P1 below the lens 3.

  Further, the remainder of the sunlight LS, that is, the other part LS <b> 2 enters the lens 3 while being diffused from the processing unit 8 of the lens 3, and is reflected by the incident surface 30 of the lens 3. The reflected sunlight is emitted as outgoing sunlight LS20 while diffusing again from the exit surface 31 of the lens 3. That is, the emitted sunlight LS20 does not concentrate at the certain position P1. Note that the optical path of the other part LS2 of the sunlight LS in FIG. 3B and the optical path of the emitted sunlight LS20 are diffused in the processing unit 8, and thus are different from the actual optical path.

  Thus, the vehicular lamp 1 according to the first embodiment can prevent the sunlight LS from concentrating through the lens 3 at a certain position P1 below the lens 3.

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

  The vehicular lamp 1 according to the first embodiment has a range H1 other than the range where the low-beam light distribution pattern is irradiated among the lenses 3 and the range H2 where the sunlight LS is incident. A processing unit 8 that performs diffusion processing on a part of LS2 is provided. For this reason, even if the sunlight LS is incident on the lens 3, the processing unit 8 diffuses another part LS <b> 2 of the sunlight LS. As a result, it is possible to prevent the sunlight LS, that is, the emitted sunlight LS10 and LS20 from being concentrated in large amounts at a position P1 below the lens 3.

  Here, the case of the lens 300 in which the processing unit 8 is not provided will be described with reference to FIG. In the case of this lens 300, all of the sunlight LS enters the lens 300 from the exit surface 31 of the lens 300 and is reflected by the entrance surface 30 of the lens 300. The reflected sunlight is emitted again from the exit surface 31 of the lens 300 to the outside as outgoing sunlight LS0. A large amount of the emitted sunlight LS0 is concentrated at a certain position P10 below the lens 300. For this reason, if an inner panel (not shown) is disposed at a position P10 below the lens 300, the inner panel may melt if it is made of resin. In particular, the degree of melting is high when the inner panel is black. Therefore, it is necessary to dispose the inner panel further below a position P10 below the lens 300. As a result, the degree of freedom in designing the inner panel tends to decrease. In order to maintain the degree of freedom in designing the inner panel, for example, aluminum deposition may be performed on the inner panel, an aluminum plate may be provided, or a light shielding plate may be provided above the lens 300. In this case, the manufacturing cost becomes expensive.

  On the other hand, the vehicular lamp 1 according to the first embodiment can prevent the sunlight LS, that is, the emitted sunlight LS10 and LS20 from being concentrated in a large amount at the position P1 below the lens 3. It is possible to prevent melting of the resin inner panel 7 disposed below the lens 3. Thereby, since it is not necessary to arrange the inner panel 7 further below a certain position P1 below the lens 3, the design freedom of the inner panel 7 is maintained. In addition, it is not necessary to deposit aluminum on the inner panel 7, for example, to provide an aluminum plate, or to provide a light shielding plate above the lens 3, so that the manufacturing cost can be maintained at a low cost.

  In the vehicular lamp 1 according to the first embodiment, since the light emitting surface of the light emitting unit 20 of the light source 2 faces upward and faces the reflecting surface 40 of the reflector 4, the light emitting unit 20 of the light source 2 is used. The light L1 from the light emitting surface is reflected by the reflecting surface 40 of the reflector 4, and the reflected light L1 is incident on the incident surface 30 of the portion from the center of the lens 3 to the lower side. For this reason, even if the processing unit 8 is provided in the upper part 32 of the lens 3, the light L 1 from the light emitting surface of the light emitting unit 20 of the light source 2 is not cut when passing through the lens 3. . That is, the amount of light that forms the low beam distribution pattern is not reduced. As described above, the vehicular lamp 1 according to the first embodiment is most suitable for a projector-type lamp unit in which the light emitting surface of the light emitting unit 20 of the light source 2 faces upward and faces the reflecting surface 40 of the reflector 4.

  In the vehicular lamp 1 according to the first embodiment, the upper portion 32 of the lens 3 is cut off, and the processing unit 8 is provided at least on the cut surface of the upper portion 32 of the lens 3, as shown in FIG. In addition, in the sunlight LS, the optical path of the other part LS2 incident on the cut surface of the upper part 32 of the lens 3 is different from the optical path of the part LS1 incident from the exit surface 31 of the lens 3. As a result, it is possible to further reduce the amount of the outgoing sunlight LS10 that concentrates at a certain position P1 below the lens 3. Moreover, since the processing unit 8 is provided on the excision surface of the upper part 32 of the lens 3, the optical path of the other part LS2 that is incident while diffusing into the processing unit 8 of the excision surface of the upper part 32 of the lens 3; The optical path of a part LS1 incident from the exit surface 31 of the lens 3 is definitely different. Thereby, the quantity of the emitted sunlight LS10 concentrated on a certain position P1 below the lens 3 can be reliably reduced.

  In the vehicular lamp 1 according to the first embodiment, the upper portion 32 of the lens 3 is cut off, and the processing unit 8 is provided at least on the cut surface of the upper portion 32 of the lens 3, as shown in FIG. In addition, the processing unit 8 can efficiently diffuse the sunlight LS incident on the lens 3 obliquely from above.

  In the vehicular lamp 1 according to the first embodiment, since the upper part 32 of the lens 3 is cut away, the vertical dimension of the lens 3 can be reduced. The lens 3 has a shape in which a circular upper portion 32 is cut off when viewed from the front (viewed from the front), and the left and right side portions or one side portion of the circular shape in which the upper portion 32 is cut off. May be excised.

  In the vehicular lamp 1 according to the first embodiment, the lens 3 is made of a resin lens, and the processing unit 8 is made up of small concavo-convex groups that diffuse the other part LS2 of the sunlight LS. Thus, the lens 3 and the processing unit 8 can be integrally formed. For this reason, the manufacturing cost can be reduced.

(Description of Configuration of Embodiment 2)
FIG. 4 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 3 denote the same components.

  The vehicular lamp 1 according to the first embodiment includes the processing unit 8 in the vicinity of the upper portion 32 of the cut surface of the upper portion 32 of the lens 3 and the exit surface 31 of the lens 3. On the other hand, the vehicular lamp 100 according to the second embodiment does not cut out the upper part of the lens 3, and the processing unit 8 (small triangular solid line in FIG. 4) is formed on the emission surface 31 of the upper part of the lens 3. Are provided). The range in which the processing unit 8 is provided in the second embodiment is substantially the same as the range (H1, H2) in which the processing unit 8 in the first embodiment is provided. The lens 3 has a circular shape when viewed from the front, but the left and right sides or one side may be cut off.

(Description of the effect of Embodiment 2)
The vehicular lamp 100 according to the second embodiment can achieve substantially the same operational effects as the vehicular lamp 1 according to the first embodiment. In particular, since the vehicular lamp 100 according to the second embodiment does not cut the upper portion of the lens 3, only a minor change of the existing lens molding die is required, and the manufacturing cost can be reduced accordingly.

(Description of examples other than Embodiments 1 and 2)
In the first and second embodiments, the processing unit 8 is composed of a small concavo-convex group (diffusion prism group) that diffuses sunlight LS. However, in the present invention, the processing unit may be a processing unit that shields sunlight, such as a shading coating.

  In the first and second embodiments, the shade 6 is used to irradiate the low beam light distribution pattern. However, in the present invention, a light distribution pattern other than the low beam distribution pattern, for example, a high beam distribution pattern may be irradiated without using the shade 6.

DESCRIPTION OF SYMBOLS 1,100 Vehicle lamp 2 Light source 20 Light emission part 21 Board | substrate part 3 Lens 30 Incident surface 31 Output surface 32 Upper part 4 Reflector 40 Reflecting surface 5 Heat sink member 6 Shade 7 Inner panel 8 Processing part F1 1st focus F2 2nd focus F3 lens Focal point H1 Range other than the range where the low beam distribution pattern is irradiated H2 Range where sunlight enters L1 Light from the light source (reflected light)
LS Sunlight LS1 Part of sunlight LS2 Other part of sunlight LS0, LS10, LS20 Outgoing sunlight P1, P10

Claims (3)

A semiconductor-type light source having a light emitting surface;
An aspheric projection lens that irradiates the light from the light emitting surface of the light source to the outside with a predetermined light distribution pattern;
A reflector provided with a reflection surface based on a spheroidal surface whose first focal point is located at or near the light emitting surface of the semiconductor-type light source;
With
The light emitting surface of the semiconductor-type light source faces upward and faces the reflective surface,
The range other than the range that irradiates the light distribution pattern in the upper part of the projection lens and the range in which sunlight is incident are cut off,
At least the cut surface above the projection lens is provided with a processing unit for diffusing or shielding sunlight.
A vehicular lamp characterized by the above. The projection lens is made of a resin lens,
The processing unit is composed of small concavo-convex groups that diffuse sunlight,
The vehicular lamp according to claim 1 . The processing unit is provided in the vicinity of the upper part of the exit surface of the projection lens.
The vehicular lamp according to claim 1 or 2.