JP5316226B2 - Lighting fixtures for vehicles - Google Patents

Description

  The present invention relates to a vehicular illumination lamp, and more particularly to a projector-type vehicular illumination lamp that uses a semiconductor-type light emitting element such as an LED as a light source.

  Conventionally, a projector-type vehicle headlamp using a semiconductor-type light emitting element such as an LED as a light source is known (see, for example, Patent Document 1).

  A vehicle headlamp disclosed in Patent Document 1 includes a horizontally long cylindrical lens disposed on an optical axis extending in the vehicle front-rear direction, and a light emitting element disposed in the vicinity of the rear focal point of the cylindrical lens, and the light emitting element The direct light from is diffused in the horizontal direction by the lens and irradiated forward.

  FIG. 9 shows an example of a diffusion type light distribution pattern in a conventional vehicle headlamp using a cylindrical lens. In the figure, the portion indicated by reference numeral S1 is a portion where the light distribution warps, the portion indicated by reference numeral S2 is the portion where the light distribution warps, and portions other than the portions S1 and S2 are required for illumination. This is an effective light distribution part. That is, the rising of the light distribution, which is the portion S1, adversely affects the oncoming vehicle as dazzling light, and the lowering of the light distribution, which is the portion S2, causes unevenness in the road surface light, which adversely affects light leakage near the vehicle. However, in the case of a horizontally long cylindrical lens, such problematic portions S1 and S2 have occurred.

JP 2007-213879 A.

  As described above, in the vehicular illumination lamp using a conventional horizontally long cylindrical lens, a light distribution warp that becomes dazzling light on the oncoming vehicle side, a light distribution warp that causes unevenness in road surface light, etc. occur. However, there was a problem in terms of light distribution.

  In addition, in the structure of a vehicular illumination lamp that simply uses a cylindrical lens having a horizontally long shape, a lateral width dimension in the vehicle left-right direction is required to be large. For this reason, for example, when the outer shape of the lamp, such as a lamp lens (outer lens), is designed as a curved surface, it is difficult to match the outer shape of the lamp, and there is a problem that the layout at the time of designing the lamp is limited. there were. Furthermore, since the light is diffused two-dimensionally, there is a problem that visibility is poor in the horizontal light distribution.

  The present invention has been made in view of the above circumstances, and the object of the present invention is to obtain a light distribution pattern suitable for vehicle illumination by eliminating the warping and warping of the light distribution, and in the horizontal direction. An object of the present invention is to provide a vehicular illumination lamp that is excellent in visibility and provides a degree of design freedom.

  In order to solve the above problems, a vehicle illumination lamp according to the present invention includes a convex lens disposed on an optical axis extending in the vehicle front-rear direction, and a light emitting element disposed in the vicinity of the rear focal point of the convex lens, In the vehicular illumination lamp that controls deflection of direct light from the light emitting element with the lens, the convex lens has a horizontally long shape when viewed from the front, the front side protrudes in the front direction of the vehicle when viewed from the top, and the rear side is The lens portion has a bow shape that is recessed in the front direction of the vehicle, and the lower half of the lens portion from the optical axis of the convex lens has a shape that deflects light from the light source downward.

  According to this configuration, a convex lens having a horizontally long shape in a front view, a front side protruding in the front direction of the vehicle in a top view, and an arcuate shape in which the rear side is recessed in the front direction of the vehicle is used. Thus, it is possible to obtain a light distribution with excellent visibility in the horizontal direction. In addition, the lower half of the optical axis of the convex lens deflects light from the light source downward, so that the upward light beam is directed downwards, eliminating the rise and fall of the light distribution. Enable. Furthermore, since the convex lens has an arcuate shape protruding in the front direction of the vehicle, even if the outer shape of the lamp, such as an outer lens, is designed with a curved surface shape, It is easy to match the shape and is not subject to layout restrictions during design.

  In the above configuration, the convex lens may have a focal line on the back side.

  According to this configuration, it is possible to make the lamp thinner by arranging the light source of the light emitting element at the focal line of the lens. In addition, a wide light distribution with excellent visibility in the horizontal direction can be obtained.

  In the above configuration, the convex lens may be configured such that the curvature of the lower half curved surface from the optical axis is larger than the curvature of the upper half curved surface on the back surface side and is inclined backward.

  According to this configuration, the light from the light source is accurately controlled to be deflected downward, and the light distribution that eliminates the warping and warping of the light distribution is enabled.

  According to the present invention, it is possible to obtain a light distribution with excellent visibility in the horizontal direction. In addition, it is possible to perform light distribution that eliminates warping and warping of the light distribution. Furthermore, since it is easy to match with the shape of the outside of the lamp, there is little restriction on the layout when designing the lamp, and a degree of design freedom can be obtained.

The side view which shows the illumination lamp for vehicles which concerns on one Embodiment of this invention. The front view of the vehicular illumination lamp of this embodiment. The vertical sectional view which shows typically the arrangement | positioning of the lens and light source of an upper stage lamp unit. The perspective view of a lens same as the above. The top view of a lens same as the above. The front view of a lens same as the above. AA line sectional view of Drawing 6. The figure which shows the light distribution pattern irradiated from an upper stage lamp unit. The figure which shows the light distribution pattern irradiated from the conventional vehicle headlamp.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings. 1 and 2 show a vehicular lamp according to an embodiment of the present invention. FIG. 1 is a side view thereof, and FIG. 2 is a front view thereof. In the following description, the left and right direction left side of FIG. 1 is assumed to be the front, the right side is the rear side, the up and down direction is the top and bottom, and the direction perpendicular to the paper surface is the left and right.

  In FIG.1 and FIG.2, the code | symbol 1 is the vehicle headlamp in this embodiment. The vehicle headlamp 1 includes an upper lamp unit 2 (light distribution for large diffusion), a lower lamp unit 3 (light distribution for an oblique cut line), a lamp lens 4 and the like. The lamp lens 4 is a transparent outer lens, for example.

  The upper lamp unit 2 and the lower lamp unit 3 are disposed on a heat sink 5 made of aluminum die casting that also serves as a unit mounting portion. The upper lamp unit 2 is a lamp unit as a vehicular illumination lamp having the most characteristic configuration of the present invention.

  Hereinafter, the configuration of the upper lamp unit 2 will be described in more detail. The upper lamp unit 2 includes an optical unit 2A and a light source unit 2B.

  The light source unit 2B is configured by providing a light emitting element 6 as a light source on a heat sink 5. The light-emitting element 6 is a white diode (LED) as a semiconductor-type light-emitting element having a substantially rectangular outer shape in which a plurality of light-emitting chips each having a size of about 1 mm square are arranged. In a supported state, as shown in FIG. 3, it is positioned immediately above the optical axis OA and is disposed forward. The light source unit 2B is fixed to the heat sink 5 via the substrate 7.

  On the other hand, the optical unit 2 </ b> A includes a projection lens 11. The projection lens 11 is shown in detail in FIGS. When viewed from the front, the projection lens 11 has a horizontally long shape as shown in FIG. 6, and when viewed from the top, the front side projects in the front direction of the vehicle as shown in FIG. 5, and the rear side has a curvature R1 and a front direction of the vehicle. It is composed of a convex lens that has an arcuate shape that is recessed in the middle. Further, as shown in FIG. 5, the projection lens 11 has a focal line (focal point on the line) 12 on the back surface (rear) side. And in this embodiment, the light emitting element 6 is arrange | positioned on the focal line 12 of this projection lens 11, and by this, the direct light from the light emitting element 6 is expanded to a horizontal direction, and it irradiates ahead, A diffusion type The predetermined light distribution pattern can be projected.

  Further, a notch-shaped curved portion 13 is formed on the rear surface side of the projection lens 11 by denting the rear surface side of the lens in the vehicle front direction. Furthermore, the curvature RL of the curved surface 11L on the back surface of the lens portion on the lower half side of the optical axis OA is the basic surface of the projection lens 11 as shown in FIG. 7 with respect to the curvature R that forms the basic focal point of the projection lens. The curvature R of the curved surface 11H on the back surface of the lens unit on the upper half side from the optical axis OA is smaller than the curvature R forming the basic focal point of the projection lens (RL>), which is larger than the curvature R forming the focal point (R <RL). R) (RH <R), and the curved surface 11L is inclined at an angle θ toward the rear of the curved surface 11H. The angle θ is set to 0 ° to 5 ° (0 ° <θ <5 °).

  The upper lamp unit 2 in this embodiment has a structure in which the projection lens 11 is formed as described above, and the light emitting element 6 is arranged on the lens focal line 12 of the projection lens 11. As shown in FIG. 3, the direct light incident on 11 is emitted to the outside (in front of the vehicle) as outgoing light L1, L2, and L3.

  That is, the light incident near the center of the lens is emitted almost horizontally along the optical axis OA as the outgoing light L1, and the light incident on the upper side of the lens (lens portion on the upper half side) is emitted as the outgoing light L2. The light that is deflected to the lower side and emitted and is incident on the lower side of the lens (the lens portion on the lower half side) is deflected to the lower side of the outgoing light L1 and emitted as outgoing light L3.

  Then, by the deflection control by the projection lens 11, as shown in FIG. 8, a wide downward light distribution pattern excellent in visibility in the horizontal direction can be obtained. Also, with this light distribution, it is possible to perform light distribution that eliminates the warping and warping of the light distribution, which has been a problem with conventional vehicle lighting fixtures.

  Therefore, the vehicle lighting device in the present embodiment has a horizontally long shape when viewed from the front, and has a bow shape with the front side protruding in the front direction of the vehicle and the rear side recessed in the front direction of the vehicle in the top view. Since the projection lens (convex lens) 11 is used, light distribution with excellent visibility in the horizontal direction can be obtained.

  In addition, the curved surface 11H of the lower half of the optical axis OA of the projection lens 11 deflects the light from the light source (light receiving element 6) downward, so that the upward light beam is directed downward and the light distribution. Light distribution without warping and warping is possible.

  Further, even when the projection lens 11 has an arcuate shape protruding in the front direction of the vehicle, the outer shape of the lamp such as the shape of the lamp lens 4 is designed to be a curved shape. It is easy to adapt to the shape of the outside of the lamp, and the layout at the time of lamp design is not so limited.

  Further, since the lower side of the light emitting element 6 is arranged on the lens focal line 12, the lamp can be made thin, and the light from the light source (light receiving element 6) is further deflected downward to be horizontal. A wide light distribution with excellent visibility can be obtained.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

  As described above, the present invention has been described with respect to the vehicular illumination lamp. However, the present invention can be applied not only to the vehicular lamp but also to a general signal lamp.

DESCRIPTION OF SYMBOLS 1 Vehicle headlamp 2 Upper stage lamp unit 2A Optical unit 2B Light source unit 3 Lower stage lamp unit 4 Lamp lens 5 Heat sink 6 Light emitting element (LED)
7 Substrate 11 Projection lens (convex lens)
11L Lower half curved surface 11H Upper half curved surface 12 Lens focal line 13 Curved portion L1 Emission light L2 Emission light L3 Emission light R1 Arcuate curvature R2 Curvature curvature RL Curvature RH Curvature OA Optical axis θ Inclination angle S1 Light distribution warpage Rising part S2 Warp falling part of light distribution

Claims (2)

A vehicular illumination lamp including a convex lens disposed on an optical axis extending in the vehicle front-rear direction and a light emitting element disposed in the vicinity of a rear focal point of the convex lens, and deflecting control of direct light from the light emitting element by the lens. In
The convex lens has a horizontally long shape when viewed from the front, has a bow shape with the front side protruding in the front direction of the vehicle and the rear side recessed in the front direction of the vehicle in the top view, and the back side of the convex lens. Is larger in curvature of the curved surface in the lower half than the optical axis than the curved surface in the upper half, and tilts backward,
Lens unit of the below optical axis half of the convex lens, the vehicle lamp, wherein the benzalkonium deflects downward light from the light source.   2. The vehicular illumination lamp according to claim 1, wherein the convex lens has a focal line on the back surface side.

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