JP4798784B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp, and more specifically, a light distribution is formed by combining a plurality of light sources that emit light in one direction, such as a light emitting diode, with a relatively small amount of light per unit. The present invention relates to a configuration of a vehicular lamp that is suitable for the above.

  Examples of the configuration of a conventional vehicle lamp 90 that uses this type of light-emitting diode as a light source include those shown in FIGS. 7 to 9, for example. Appropriate numbers of first light emitting diodes 70 to which the first light guide lenses 71 are attached and second light emitting diodes 80 to which the second light guide lenses 81 are attached are attached.

  Here, the first light guide lens 71 attached to the first light emitting diode 70 has a substantially fan shape as shown in FIG. 7, and spreads the light from the first light emitting diode 70 to a predetermined range. It has a light distribution characteristic and radiates to the outside. On the other hand, as shown in FIG. 8, the second light guide lens 81 has a convex lens shape, and the light from the second light emitting diode 80 has a spot-like light distribution characteristic to the outside. It is supposed to radiate.

Therefore, for example, by attaching an appropriate number of the second light emitting diodes 80 to the center of the vehicular lamp 90, the front direction of the vehicular lamp 90 can be irradiated with sufficient brightness. When 90 is for left-hand traffic, as shown in FIG. 9, the second light-emitting diode with the second light guide lens 81 attached to the front right side is attached so as to rise to the right, and from the driver's seat. A road sign on the shoulder side when viewing and a field of view for pedestrians are secured, and a first light emitting diode 70 having a first light guide lens 71 is horizontally mounted on the left side of the front so as not to give glare to oncoming vehicles. Like that.
JP 2004-071409 A

  However, as described above, when the light distribution diodes 70 and 80 having different light distribution characteristics are combined to form an appropriate light distribution characteristic as the vehicular lamp 90, how many characteristics are located at which position in advance. It is necessary to consider whether it is preferable to arrange the light emitting diodes 70 and 80, and even if the arrangement is determined, an error in mounting on the actual vehicle lamp 90 or each light emission There is a problem that it is difficult to obtain the vehicular lamp 90 having uniform characteristics due to, for example, a total of errors generated individually in the diodes 70 and 80.

As specific means for solving the above-described conventional problems, the present invention has a light emitting element disposed above the vehicle and a reflecting surface for reflecting light from the light emitting element forward of the vehicle. A light guide block, and the light guide block has a cross-sectional shape in the vertical direction along the optical axis of the reflecting surface, which is set to a substantially parabolic shape having a focal point on the optical axis. the incidence plane to be incident on the interior of the light guide blocks light is set as a position that substantially coincides with and the focal point in the horizontal plane passing through the optical axis from the the entrance surface and blackout process rearward from the focal point facilities Further, a part or all of the reflection surface is subjected to a reflection process for reflecting the light reaching the reflection surface, thereby providing a vehicular lamp that simplifies the configuration. , Average Vehicular lamp, such performance is to solve the problems as easily obtained.

  According to the present invention, the transparent plate-like member divided into the upper half part of the parabola along the optical axis forms a shielding film by shielding the back from the focal point of the upper half part divided as described above, and emits light from LEDs, etc. By disposing the element so as to emit upward light in the vicinity of the front of the focal point of the upper half, a light / dark boundary line is formed in the irradiation light by the shielding part.

  Therefore, if a plurality of transparent plate-shaped members divided into the upper half of the parabola are formed with a shielding film, aligned in parallel, and combined with light emitting elements, the overall brightness is sufficient. Therefore, it is possible to easily and easily obtain illumination light having a clear light-dark boundary line that does not cause dazzling oncoming vehicles.

  Below, this invention is demonstrated in detail based on embodiment shown in a figure. 1 and FIG. 2 is a light guide block made of acrylic resin or glass, for example, according to the vehicular lamp 10 according to the present invention, and an arbitrary number of the light guide blocks 1 is provided. The vehicular lamp 10 of the present invention is configured, and the illustration shows an example in which the light guide block 1 adopts the upper half of a parabola with respect to the optical axis Y.

  Here, in the present invention, the light guide block 1 is formed of a transparent plate-like resin or the like, and as shown in FIG. 1, the optical axis Y and the incident surface 1a which is the lower surface coincide with each other or substantially coincide with each other. The reflecting surface 1b, which is a parabola, appears with the optical axis Y as a reference. In this embodiment, the light emitting surface 1c for emitting light is shown as an example in which the light emitting surface 1c is formed as a vertical or substantially vertical plane with respect to the incident surface 1a. The deformation of is free.

  Since the light guide block 1 is formed as described above, the focal point F of the light guide block 1 exists on the incident surface 1a, that is, the surface that coincides with or substantially coincides with the optical axis Y. Accordingly, in the present invention, the light shielding film 3 is formed by painting, vapor deposition, or the like from the vicinity of the position where the focal point F is present as viewed from the direction of the light emitting surface 1c. A shading process is performed.

  Further, in the present invention, a light source 2 such as a chip type LED lamp having a flat emitting portion is disposed near the focal point F of the incident surface 1a. Thus, the light emitting element 2a of the light source 2 is attached to the front side of the light shielding film 3, that is, to the light emitting surface 1c. Accordingly, the light emitting element 2a is present in front of the focal point F with respect to the reflecting surface 1b formed by a parabola, and after being reflected by the reflecting surface 1b, the light emitting element 2a is directed downward from the horizontal to the outside from the light emitting surface 1c. Will be emitted.

  Here, what is indicated by reference numeral 4 in FIG. 1 is a reflection film provided on a portion where total reflection is not performed on the inner surface when light from the light source 2 (light emitting element 2a) reaches the reflection surface 1b. This reflective film 4 is typically formed by means conventionally employed in the production of this type of vehicle lamp 1, such as vacuum deposition of aluminum, painting, or attachment by another member.

  In addition, since the above-described reflective film 4 can be made to transmit no light if it has an appropriate film thickness, it is the same process as the light-shielding film 3 described above by means such as appropriately adjusting the deposition time. Thus, the production efficiency can be improved.

  Also, what is indicated by reference numeral 1e in the drawing is, for example, an attachment pin for fixing the light guide block 1 on a circuit board (not shown) on which the light source 2 is attached so as to be able to supply power. The mounting pin 1e allows the light source 2 and the light guide block 1 to be mounted at a predetermined position on the circuit board.

  As described above, since the light guide block 1 is formed, when the light guide block 1 is mounted on a vehicle or the like so that the optical axis Y is horizontal, the light shielding film 3 and the reflecting surface 1b act. The irradiation light that does not generate upward light can be obtained, and the effect of shielding the light emitted obliquely backward from the light emitting element 2a by the action of the light shielding film 3 can be obtained. As shown, the light distribution characteristic D having a clear light / dark boundary line can be obtained.

  At this time, if a part of the light emitting element 2a and a part of the light shielding film 3 are overlapped, the light shielding film 3 covers a part of the light emitting element 2a. Since a part of the light emitting area 2a is covered with the light shielding film 3, the contrast between the bright and dark boundary lines obtained thereby becomes stronger and a clearer light and dark boundary line can be obtained. At this time, it is desirable that the ratio of light shielding related to the light emitting area is about 1/4 (15% in terms of area) of the diameter when the diameter of the light emitting area is 3 mm and the focal length of the reflecting surface is 10 mm.

  Here, considering the light distribution in the horizontal direction of the light guide block 1 of the present invention, the light from the light emitting element 2a is repeatedly reflected at the same angle by the side surface (see FIG. 2), and from the light emitting surface 1c. Since the light is radiated to the outside, the light is radiated forward without changing the radiation angle from the light emitting element 2a.

  FIG. 5 shows an embodiment in which the incident surface 1a and the reflecting surface 1b are turned upside down due to a design requirement or the like. At this time, the light shielding film 3 is placed in front of the focal point F, that is, the light. The guide block 1 is provided on the light emission surface 1c side, and the light source 2 may be moved to the rear side of the focal point F.

  In this way, the same light distribution characteristic of downward light can be obtained even when the light guide block 1 is turned upside down. For example, if both are used properly according to the design of the vehicle, the design side Then it becomes more effective. In the present invention, the side surface 1d does not need to be parallel as described above, and may have a shape that opens toward the light emitting surface 1c as shown in a cross-sectional view in FIG. 6 or a shape that closes. Is.

  At this time, when the side surface 1d is opened as shown in FIG. 6, the light emitted from the light emitting surface 1c has a narrower divergence angle, and conversely, the side surface 1d is closed. If so, the light emitted from the light emitting surface 1c tends to have a divergent angle, so that, for example, it can be used separately at the center and the periphery of the vehicular lamp 10 to obtain a desired light distribution characteristic. This is an effective means for forming the light distribution characteristics.

It is sectional drawing of the light guide block which is the principal part of the vehicle lamp which concerns on this invention. It is a bottom view of a light guide block similarly. It is explanatory drawing which shows the example of the light distribution characteristic of the vehicle lamp which concerns on this invention. It is explanatory drawing shown in the state which attached the vehicle lamp which concerns on this invention to the vehicle. It is sectional drawing which shows a structure when a light guide block is turned upside down. It is sectional drawing which shows another embodiment of a light guide block. It is explanatory drawing which shows the shape of the 1st light guide lens in a prior art example. It is explanatory drawing which shows the shape of the 2nd light guide lens in the same prior art example. It is explanatory drawing which shows the structure of the vehicle lamp of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Light guide block 1a ... Incident surface 1b ... Reflective surface 1c ... Light emission surface 1d ... Side surface 1e ... Mounting pin 2 ... Light source 2a ... Light emitting element 3 ... Light-shielding film 4 ... Reflective film Y ... Optical axis

Claims (4)

A light emitting element disposed toward the top of the vehicle;
A light guide block having a reflecting surface for reflecting the light from the light emitting element forward of the vehicle,
In this light guide block, the cross-sectional shape in the vertical direction along the optical axis of the reflecting surface is set to a substantially parabolic shape having a focal point on the optical axis, and light from the light emitting element is transmitted to the light guide block. The incident surface that is incident on the inside is set as a position that is a horizontal plane that passes through the optical axis and substantially coincides with the focal point.
The incident surface is subjected to a light shielding process behind the focal point,
A vehicular lamp, wherein a part or all of the reflection surface is subjected to a reflection process for reflecting light reaching the reflection surface. A light emitting element disposed toward the lower side of the vehicle, and a light guide block having a reflecting surface for reflecting light from the light emitting element forward of the vehicle,
In this light guide block, the cross-sectional shape in the vertical direction along the optical axis of the reflecting surface is set to a substantially parabolic shape having a focal point on the optical axis, and light from the light emitting element is transmitted to the light guide block. An incident surface incident on the inside is set as a position that is a horizontal plane that passes through the optical axis and substantially coincides with the focal point. The incident surface is subjected to a light shielding process in front of the focal point, and is a part of the reflecting surface. Alternatively, the vehicular lamp is characterized in that a reflection process for reflecting the light reaching the reflecting surface is applied to all. 3. The vehicular lamp according to claim 1 , wherein the surface shape of the reflecting surface is set as a substantially parabolic column shape having a parabola appearing in a vertical cross section passing through the focal point as a cross section.   The light emitting element is a light emitting diode having a substantially flat surface that emits light, the light emitting diode is provided close to the incident surface of the light guide block, and the light shielding process of the incident surface is performed by the light emitting diode. The vehicle lamp according to any one of claims 1 to 3, wherein a part of the part is covered.

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