JP2016119219A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture capable of satisfying a standard of light distribution characteristics even in the event of a bulb not being lighted, while enhancing an integrated feeling of a lamp unit including a bulb light emitting part and an LED light emitting part.SOLUTION: In a vehicular lighting fixture 1 comprising a tail/stop lamp (lamp unit) 7 including a bulb light emitting part 7A whose light source is a bulb 12, and an LED light emitting part 7B whose light source is an LED, which is stored in a lamp chamber 4 defined by a housing 2 and an outer lens 3 for covering an opening of the housing, a fish-eye cut is formed at a portion corresponding to the bulb light emitting part 7A of the outer lens 3, and a flute cut is formed at a portion corresponding to the LED light emitting part 7B of the outer lens 3. Also, an R-value of the flute cut is set to a constant value in which a diffusion angle of the light from the bulb light emitting part 7A in the outer lens 3 and a diffusion angle of the light from the LED light emitting part 7B become equal.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicular lamp such as a rear combination lamp having a lamp unit including a bulb light-emitting unit that uses a bulb as a light source and an LED light-emitting unit that uses an LED (light-emitting diode) as a light source.

  For example, a rear combination lamp disposed on the left and right of the rear part of the vehicle is configured by incorporating a plurality of lamp units having different functions such as a tail / stop lamp, a turn signal lamp, and a back lamp in one lamp chamber. In such a rear combination lamp, for example, a tail / stop lamp is configured by a bulb light emitting unit using a bulb as a light source and an LED light emitting unit using an LED as a light source (see, for example, Patent Documents 1 and 2). ).

  However, as described above, in a lamp unit such as a tail / stop lamp having a bulb light emitting part and an LED light emitting part, a large number of LEDs are required to increase the light emission range, resulting in an increase in cost.

  In view of this, a configuration has been proposed in which a light guide is used for the LED light-emitting portion, the LEDs are arranged opposite to each other in the longitudinal direction of the light guide, and light from each LED enters the light guide. Has been. In such a configuration, light incident on the light guide from each LED is reflected by the cut formed on the back surface of the light guide in the process of being guided in the longitudinal direction while repeating total reflection in the light guide. Since it radiates | emits from the output surface of a light guide, the whole light guide emits light uniformly, and a large area can be light-emitted with few LEDs.

JP 2010-192320 A Japanese Patent No. 5368233

  However, in a lamp unit that includes a bulb light emitting unit and an LED light emitting unit and uses a light guide for the LED light emitting unit, the diffusion angle of the light emitted from the bulb light emitting unit and the outer lens of the light emitted from the LED light emitting unit are There is a problem that the unity feeling of the lamp unit is impaired due to the different diffusion angles.

  The present invention has been made in view of the above problems, and its purpose is to increase the sense of unity of a lamp unit including a bulb light emitting portion and an LED light emitting portion, and to distribute light even when the bulb is not lighted. An object of the present invention is to provide a vehicular lamp that can satisfy the above standards.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided a bulb light-emitting portion having a bulb as a light source and an LED light-emitting portion having an LED as a light source in a lamp chamber defined by an outer lens covering the housing and the opening. In a vehicular lamp comprising a lamp unit provided, a fish-eye cut is formed in a portion corresponding to the bulb light emitting portion of the outer lens, and a flute cut is formed in a portion corresponding to the LED light emitting portion of the outer lens. It is characterized by.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the R value of the flute cut is set constant.

  The invention according to claim 3 is the invention according to claim 2, wherein the R value of the flute cut is equal to the diffusion angle of light from the bulb light emitting part and the diffusion angle of light from the LED light emitting part in the outer lens. It is set to the value which becomes.

  According to a fourth aspect of the present invention, there is provided an LED light-emitting unit composed of a bulb light-emitting unit having a bulb as a light source and a light guide having an LED as a light source in a lamp chamber defined by a housing and an outer lens covering the opening. In the vehicular lamp comprising the lamp unit, a flat surface is formed at the center of the portion corresponding to the LED light emitting portion of the outer lens, and flute cuts are formed on both sides of the central surface, and the flat surface and the flute are formed. The cut is formed along the longitudinal direction of the light guide.

  According to the first aspect of the present invention, since the fish-eye cut is formed in the portion corresponding to the bulb light emitting portion of the outer lens and the flute cut is formed in the portion corresponding to the LED light emitting portion of the outer lens, the light from the bulb light emitting portion is formed. The diffusion angle in the outer lens by the fish-eye cut and the diffusion angle in the outer lens by the flute cut of the light from the LED light emitting part can be approximated, and the sense of unity of the lamp unit including the bulb light emitting part and the LED light emitting part is enhanced.

  According to the second and third aspects of the invention, the R value of the flute cut is set to a constant value at which the diffusion angle of light from the bulb light emitting portion and the diffusion angle of light from the LED light emitting portion in the outer lens are equal. The unity of the lamp unit including the light emitting unit and the LED light emitting unit is further enhanced.

  According to the invention of claim 4, since the flat surface is formed at the center of the portion corresponding to the LED light emitting portion of the outer lens and the flute cut is formed on both sides of the central surface, the bulb light emitting portion is Even if the lamp is not lit, the light distribution characteristics of the vehicular lamp can be satisfied with only the LED light emitting section, and the vehicle can be safely operated at night.

1 is a front view of a vehicular lamp according to the present invention. It is the sectional view on the AA line of FIG. It is the B section enlarged detail drawing of FIG. It is a front view of the light guide of the vehicle lamp which concerns on this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a front view of a vehicular lamp according to the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is an enlarged detail view of a portion B in FIG. The vehicular lamp 1 according to the present embodiment is a rear combination lamp disposed on the left and right of the rear of the vehicle. The left and right rear combination lamps 1 are symmetrical and have the same basic configuration. Therefore, only one rear combination lamp 1 will be illustrated and described below.

  A rear combination lamp 1 shown in FIG. 1 includes a turn signal lamp 5 as a lamp unit having a different function in a lamp chamber 4 defined by a housing 2 and an outer lens 3 (see FIGS. 2 and 3) covering the opening. The back lamp 6 and the tail / stop lamp 7 are accommodated.

  As shown in FIG. 1, the turn signal lamp 5 and the back lamp 6 are arranged side by side in a front view, and these light bulbs 8 and 9 are light sources, and light from the bulbs 8 and 9 is transmitted. Reflectors 10 and 11 that reflect toward the rear of the vehicle (frontward in FIG. 1) are provided.

  Further, as shown in FIG. 2, the tail / stop lamp 7 includes a bulb light emitting portion 7A that uses a bulb 12 as a light source and an LED light emitting portion 7B that uses an LED (not shown) as a light source. 7A includes the bulb 12 inserted and fixed in the housing 2, and a reflector 13 that reflects light from the bulb 12 toward the rear of the vehicle (downward in FIG. 2). On the other hand, as shown in FIG. 1, the LED light emitting unit 7B extends laterally above the turn signal lamp 5 and the back lamp 6, and extends laterally from the side of the back lamp 6 obliquely downward. A light guide 14 (see FIG. 4) having a letter shape, an LED (not shown) arranged opposite to both longitudinal end faces (incident surfaces) of the light guide 14, and a back side of the light guide 14 A reflector 15 is provided. The light guide body 14 is made of a transparent light-transmitting resin. The front surface of the light guide body 14 forms an output surface, and the back surface of the flat surface is cut for light diffusion. .

  Thus, in the present embodiment, as shown in detail in FIG. 3, a fish-eye cut is formed in a portion (light emission range) corresponding to the bulb light emitting portion 7 </ b> A of the outer lens 3, and the LED light emission of the outer lens 3 is performed. A flute is formed in a portion (light emission range) corresponding to the portion 7B. Here, the R value (curvature radius) of the flute cut formed in the portion (light emission range) corresponding to the LED light emitting portion 7A of the outer lens 3 is constant, and the light diffusion angle α from the bulb light emitting portion 7A in the outer lens 3 is constant. And the diffusion angle β of light from the LED light emitting portion 7B is set to a value (α = β) that is equal.

  By the way, the fish-eye cut is cut in a substantially square shape and a hemispherical shape when viewed from the front, so that when the light emitted from the bulb 12 enters the fish-eye cut, the light is refracted so as to diffuse vertically and horizontally. . Note that the shape of the fish-eye cut in front view is not limited to a square, and may be a rectangle or a rhombus in front view because light only needs to diffuse vertically and horizontally. On the other hand, in the flute cut, two hemispherical cuts on the both sides of the central flat surface on the emission surface (light emission range) of the light guide 14 extend over the entire length along the longitudinal direction of the light guide 14. Is formed. When the light emitted from the emission surface of the light guide 14 enters the flute cut, the light diffuses obliquely rearward perpendicular to the longitudinal direction of the light guide 14 in front view. In other words, when the light guide 14 is arranged so as to extend in a substantially vertical direction, the light emitted from the exit surface of the light guide 14 diffuses in the substantially left-right direction when entering the flute cut, and the light guide 14 is horizontal. If it is arranged extending in the direction, the light emitted from the exit surface of the light guide 14 diffuses in a substantially vertical direction when entering the flute cut.

  With the tail / stop lamp 7 configured as described above, the bulb light emitting portion 7A and the LED light emitting portion 7B are turned on simultaneously when the vehicle is traveling at night, and the bulb 12 of the bulb light emitting portion 7A is turned on when a brake operation is performed. The driver and pedestrians of other vehicles can visually recognize that the brake operation has been performed by emitting light brightly. Here, in the LED light emitting section 7B, when an LED (not shown) arranged opposite to both longitudinal end faces (incident planes) of the light guide 14 emits light, the light is transmitted to both longitudinal end faces (of the light guide 14 ( This incident light is reflected by a cut made on the back surface of the light guide body 14 in the process of being guided in the longitudinal direction while repeating total reflection inside the light guide body 14 and is reflected on the front side. Since the light is emitted from the light exit surface and transmitted through the outer lens 3 toward the rear of the vehicle, the entire light guide 14 emits light uniformly. The light leaking from the back surface of the light guide body 14 is reflected by the reflector 15 toward the rear of the vehicle, enters the light guide body 14 again, and exits from the exit surface of the light guide body 14 toward the rear of the vehicle. LED light is used effectively.

  As described above, in the present embodiment, a fish-eye cut is formed in a portion (light emission range) corresponding to the bulb light emitting portion 7A of the outer lens 3 in the tail / stop lamp 7, and corresponding to the LED light emitting portion 7B of the outer lens 3 Since the flute cut is formed in the portion (light emission range), the diffusion angle α in the outer lens 3 due to the fish-eye cut of the light from the bulb light emitting portion 7A and the diffusion angle β in the outer lens 3 due to the flute cut of the light from the LED light emitting portion 7B Can be approximated, and the sense of unity of the tail / stop lamp 7 including the bulb light emitting portion 7A and the LED light emitting portion 7B is enhanced.

  In this embodiment, the R value (curvature radius) of the flute cut is set such that the diffusion angle α of light from the bulb light emitting portion 7A in the outer lens 3 is equal to the diffusion angle β of light from the LED light emitting portion 7B (α = Β) Since it is set to a constant value, the sense of unity of the bulb light emitting part 7A and the LED light emitting part 7B / stop lamp 7 is further enhanced.

  Further, in the present embodiment, a portion (light emission range) corresponding to the LED light emitting portion 7B of the outer lens 3 is a flat surface at the center, and flute cuts are formed on both sides of the flat surface. The light emitted from the light guide body 14 is irradiated with substantially parallel light on a flat surface to form a main light distribution, and is diffused in one of the upper, lower, left, and right sides by a flute cut, and thus around the main light distribution. Irradiated, the overall design of the light distribution characteristics of the tail / stop lamp 7 is satisfied. In particular, the light intensity standard of the tail / stop lamp 7 can be satisfied by irradiating light from the flat surface to the rear of the vehicle. Therefore, since the light distribution characteristic of the tail / stop lamp 7 can be satisfied with the light guide 14 alone, even if the bulb light emitting portion 7A becomes unlit due to the filament breakage of the bulb 12, only the LED light emitting portion 7B. This makes it possible to drive the vehicle safely at night.

  In the above embodiment, the tail / stop lamp is described as an example of the lamp unit including the bulb light emitting unit and the LED light emitting unit. However, the lamp unit including the bulb light emitting unit and the LED light emitting unit is described as a tail / stop lamp. Needless to say, the present invention can be similarly applied to a vehicular lamp including any other lamp unit.

1 Rear combination lamp (vehicle lamp)
2 Housing 3 Outer lens 4 Lamp chamber 5 Turn signal lamp (lamp unit)
7 Tail / stop lamp (lamp unit)
7A Bulb light emission part 7B LED light emission part 8,9 Bulb 10,11 Reflector 12 Valve 13 Reflector 14 Light guide 15 Reflector

Claims (4)

In a vehicular lamp comprising a lamp unit including a bulb light-emitting unit that uses a bulb as a light source and an LED light-emitting unit that uses an LED as a light source in a lamp chamber defined by an outer lens that covers the housing and its opening,
A vehicular lamp characterized in that a fish-eye cut is formed in a portion corresponding to the bulb light emitting portion of the outer lens, and a flute cut is formed in a portion corresponding to the LED light emitting portion of the outer lens.   2. The vehicular lamp according to claim 1, wherein an R value of the flute cut is set constant.   3. The vehicle according to claim 2, wherein the R value of the flute cut is set to a value at which a diffusion angle of light from the bulb light emitting portion and a light diffusion angle from the LED light emitting portion in the outer lens are equal. Lamps. A lamp unit comprising a bulb light-emitting portion that uses a bulb as a light source and an LED light-emitting portion that includes a light guide that uses an LED as a light source is housed in a lamp chamber defined by an outer lens that covers the housing and its opening. In vehicle lamps,
A flat surface is formed at the center of the portion corresponding to the LED light emitting portion of the outer lens, and flute cuts are formed on both sides of the central surface,
The vehicle lamp, wherein the flat surface and the flute cut are formed along a longitudinal direction of the light guide.

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