JP2018073459A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture capable of achieving small-sized compactification, while achieving uniform light emission without using a light guide body.SOLUTION: A vehicular lighting fixture 1 comprises by storing at least an LED (light source) 5, and reflectors 6, 7, 8 for reflecting light emitted from the LED 5, in a lamp chamber 4 defined by a housing 2 and an outer lens 3 for covering an opening of the same. The LED 5 is arranged in a light emission range of the outer lens 3 so that the light emission direction becomes the opposite from the light emission direction from the outer lens 3, and, on a reflection surface 7a of the reflector 7, a reflection cut 7a1 is formed for reflecting the light once or twice by an incident angle of the light into the reflection surface 7a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicular lamp that uses an LED (light emitting diode) or the like as a light source.

  In recent years, LEDs with high brightness and long life are being used as light sources for vehicle lamps such as headlamps and tail lamps. However, since the light emitted from these LEDs exhibits strong directivity, this highly directional light is used. Cannot be used as is. For this reason, light having a strong directivity emitted from the LED is incident on the light guide, reflected in the process of guiding the light within the light guide, and emitted to the outside to emit light. ing. For example, Patent Document 1 proposes a vehicular lamp as shown in FIG.

  8 is a cross-sectional plan view of the vehicular lamp proposed in Patent Document 1. In the illustrated vehicular lamp (tail and stop lamp) 101, light emitted from the LED 105 as a light source is guided to the light guide 112. FIG. In the process in which the light incident on the light guide 112 is guided through the light guide 112, the light is reflected in various directions, and the reflected light is emitted from the exit surface of the light guide 112. Thus, the entire light guide 112 is caused to emit light.

  However, in such a vehicular lamp 101, there is a problem that the light guide 112 is necessary, and the vicinity of the LED 105 of the light guide 112 emits light brightly and becomes darker as the distance from the LED 105 increases. Further, since the LED 105 can be seen from the outside through the transparent transparent cover (outer lens) 103 when not lit, there is a problem that the vehicular lamp 101 does not look good.

  Patent Document 2 proposes a vehicular lamp as shown in FIG. 9 that does not use a light guide.

  That is, FIG. 9 is a longitudinal sectional view of a vehicle lamp (combination lamp) proposed in Patent Document 2. In the illustrated vehicle lamp 201, an LED 205 as a light source is expanded below a lamp body (housing) 202. The light emitted from the LED 205 obliquely upward is diffused and reflected in various directions by the diffusion step 206a formed on the reflection surface of the reflector 206, and is reflected in the space formed by the exit (lower part) 202A. Light is transmitted through the inner lens 209 and further diffused by the diffusion steps 209a and 209b formed on the front and back surfaces of the inner lens 209.

JP 2004-103379 A Japanese Patent Laying-Open No. 2015-076249

  However, in the vehicular lamp 201 shown in FIG. 9 proposed in Patent Document 2, a bulging portion (lower portion) 202A is formed in the lower portion of the lamp body 201, and the LED 205 is disposed inside the bulging portion 202A. Therefore, there is a problem that the vehicular lamp 201 is enlarged.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicular lamp that can be made compact and compact while realizing uniform light emission without using a light guide. is there.

  In order to achieve the above object, according to a first aspect of the present invention, at least a light source and a reflector for reflecting light emitted from the light source are accommodated in a lamp chamber defined by an outer lens covering the housing and the opening. In the vehicular lamp, the light source is disposed within a light emission range of the outer lens so that a light emission direction thereof is opposite to a light emission direction from the outer lens, and the reflection surface of the reflector is reflected on the reflection surface. A reflection cut that reflects the light once or twice is formed according to the incident angle of the light to the surface.

  The invention according to claim 2 is the invention according to claim 1, wherein the reflector is provided with first to fourth reflecting surfaces, and the first reflecting surface of the light emitted from the LED is provided on the third reflecting surface. The light that is reflected by and incident on the third reflecting surface is reflected twice toward the outer lens, and the light that is reflected by the second reflecting surface and incident on the third reflecting surface is directed toward the fourth reflecting surface. One type of reflection cut having the same shape and the same size to be reflected once is formed.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the fourth reflecting surface that covers the light source from the front side is arranged in the lamp chamber.

  Invention of Claim 4 has the light source mounting board | substrate provided with the mounting surface which mounts the said light source in the invention in any one of Claims 1-3, The said mounting surface was made into the reflective surface, It is characterized by the above-mentioned. And

  According to the first aspect of the present invention, since the light source is disposed within the light emission range of the outer lens, the vehicle lamp can be made compact and compact. Also, since the reflection cut that reflects the light once or twice according to the incident angle of the light to the reflection surface is formed on the reflection surface of the reflector, the light emitted from the light source is reflected and diffused in various directions by the reflection cut. And uniform light emission can be realized without using a light guide.

  According to the second aspect of the present invention, one type of reflection cut having the same shape and the same size is formed on the third reflection surface, and the light incident on the third reflection surface is reflected once according to the incident angle. Alternatively, since the light is reflected and diffused twice, the reflection cut can be easily formed with high accuracy at low cost.

  According to the invention described in claim 3, since the light source is hidden behind the fourth reflecting surface and is not visible from the front side when not lit, the appearance of the vehicular lamp when not lit is enhanced.

  According to invention of Claim 4, the utilization efficiency of the light radiate | emitted from a light source can be improved with the reflective surface formed in the mounting surface of a light source mounting board | substrate.

It is a front view of the state which removed the outer lens of the vehicular lamp concerning 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 the C section enlarged detail drawing of FIG. It is the D section enlarged detail drawing of FIG. It is the EE sectional view taken on the line of FIG. (A) is a figure which shows a vertical flute cut, (b) is a figure which respectively shows a horizontal flute cut. It is a plane sectional view of the vehicular lamp proposed in patent documents 1. It is a longitudinal cross-sectional view of the vehicle lamp proposed in Patent Document 2.

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

  1 is a front view of an automotive lamp according to the present invention with an outer lens removed, 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. 5 is an enlarged detailed view of a portion C, FIG. 5 is an enlarged detailed view of a portion D of FIG. 2, FIG. 6 is a sectional view taken along line EE of FIG. FIG. 4 is a diagram showing a horizontal flute cut.

  The vehicular lamp 1 according to the present embodiment functions as a tail lamp disposed on the left and right of the rear portion of the vehicle, and the basic configuration of the left and right tail lamps is the same. Only illustrated and described.

  The vehicular lamp 1 according to the present embodiment used as a tail lamp includes a housing 2 (see FIG. 1) and a lamp chamber defined by a transparent outer lens 3 (see FIG. 2) covering the opening of the housing 2. 4 (see FIG. 2), an LED 5 as a light source, a first reflector 6, a second reflector 7, and a third reflector 8 that reflect light emitted from the LED 5, two transparent first inner lenses 9 and The second inner lens 10 and the LED mounting substrate 11 are accommodated. In addition, the mounting surface which mounts LED5 of the LED mounting substrate 11 comprises the reflective surface.

  As shown in FIG. 2, the LED 5 has a light emission direction within the light emission range of the vehicle lamp 1 (outer lens 3). The light emission direction is opposite to the light emission direction from the outer lens 3 (vehicle rear). 2 above). The LED 5 is covered from the front side by the third reflector 8, and the LED 5 can be seen from the front through the outer lens 3 and the first and second inner lenses 9 and 10 when the vehicular lamp 1 is not lit. There is no such thing.

  The first reflector 6 and the second reflector 7 are disposed obliquely along the vehicle width direction in a state where they are connected to each other in the front direction of light emission from the LED 5 (upward in FIG. 2), and the third reflector. 8 is disposed obliquely along the vehicle width direction behind the LED 5 (downward in FIG. 2). The LED mounting substrate 11 is disposed between the third reflector 8 and the first reflector 6, and the LED 5 is disposed on a surface that cannot be seen from the front side on the back side of the LED mounting substrate 11.

  Here, the inner surface of the first reflector 6 constitutes a concavely curved first reflecting surface 6a and a second reflecting surface 6b that are bent at substantially right angles, and the inner surfaces of the second reflector 7 and the third reflector 8 are recessed. A curved third reflecting surface 7a and fourth reflecting surface 8a are formed. And these 1st-4th reflective surfaces 6a, 6b, 7a, 8a are subjected to reflection treatment such as aluminum vapor deposition for increasing the reflectance, and the third reflective surface 7a of the second reflector 7 is applied to the third reflective surface 7a. As shown in FIG. 3 and FIG. 4, the same shape (saw blade shape) and the same size of one type of reflection cut 7a1 for reflecting the light incident thereon twice or once depending on the incident angle are provided on the entire surface. It is formed over.

  Further, as shown in FIG. 5, a fish-eye lens-like crosscut 9a is formed on the back surface (rear surface) of the first inner lens 9 to diffuse light incident on the first inner lens 9 vertically and horizontally. ing. As shown in FIGS. 5 and 6, the surface (front surface) of the second inner lens 10 is diffused in the left-right direction in FIG. 7A for the light incident on the second inner lens 10. A plurality of vertical flute cuts 10a shown in FIG. 7 (b) for vertically diffusing light emitted from the second inner lens 10 are formed on the back surface (rear surface). Is formed.

  Next, the operation of the vehicular lamp 1 configured as described above will be described.

  When the LED 5 which is a light source is activated and emits light at night or the like, as shown in FIG. 2, the light traveling toward the first reflecting surface 6a of the first reflector 6 is transmitted by the first reflecting surface 6a. Reflected toward the third reflecting surface 7 a of the second reflector 7. Then, as shown in FIG. 3, the reflected light is incident at a relatively large incident angle with respect to the third reflecting surface 7a, and is reflected twice by the reflecting cut 7a1 formed on the third reflecting surface 7a. A crosscut 9a formed on the back surface (rear surface) of the first inner lens 9 in the process of going to the first and second inner lenses 9, 10 and transmitting through the first and second inner lenses 9, 10. The vertical flute cut 10a and the horizontal flute cut 10b respectively formed on the front and back surfaces (front and back surfaces) of the second inner lens 10 diffuse in the vertical and horizontal directions. The light diffused in the vertical and horizontal directions by the first and second inner lenses 9 and 10 in this way finally passes through the outer lens 3 and is emitted to the outside. The relatively large incident angle refers to an angle (a large angle of about 1 ° to 10 °) larger than the angle formed by the first reflecting surface when reflecting twice.

  Further, the light emitted from the LED 5 and traveling toward the second reflecting surface 6b of the first reflector 6 is directed toward the third reflecting surface 7a of the second reflector 7 by the second reflecting surface 6b as shown in FIG. reflect. Then, as shown in FIG. 4, the reflected light is incident at a relatively small incident angle with respect to the third reflecting surface 7a, and is reflected once by the reflecting cut 7a1 formed on the third reflecting surface 7a. 3 toward the fourth reflecting surface 8 a of the reflector 8. The light is reflected by the fourth reflecting surface 8 a of the third reflector 8, travels toward the first and second inner lenses 9, 10, and passes through the first and second inner lenses 9, 10. In the same manner as described above, the light is diffused in the vertical and horizontal directions, and finally passes through the outer lens 3 and is emitted to the outside. The relatively small angle means an angle (small angle of about 1 ° to 5 °) smaller than the angle formed by the first reflecting surface when reflecting twice.

  As described above, in the vehicular lamp 1 according to the present embodiment, light is reflected once on the third reflecting surface 7a of the second reflector 7 depending on the incident angle of the light on the third reflecting surface 7a or 2 Since the reflection cut 7a1 to be reflected once is formed, the highly directional light emitted from the LED 5 can be reflected and diffused in various directions by the reflection cut 7a1, and the reflected light is reflected in the first and second inner lenses 9, 10. Therefore, uniform light emission by the LED 5 can be realized without using a light guide. Here, since one type of reflection cut 7a1 having the same shape and the same size is formed on the third reflection surface 7a of the second reflector 7, the reflection cut 7a1 can be formed easily and with high accuracy at low cost.

  Further, in the present embodiment, as shown in FIG. 2, since the LED 5 is disposed within the light emission range of the vehicle lamp 1 (outer lens 3), the vehicle lamp 1 can be made compact and compact.

  Furthermore, in the present embodiment, since the third reflector 8 that covers the LED 5 from the front side is disposed in the lamp chamber 4, the LED 5 is hidden behind the third reflector 8 and is not visible from the front side when not lit. The effect that the appearance at the time of the non-lighting of the said vehicle lamp 1 is improved is also acquired.

  And in this Embodiment, the effect that the utilization efficiency of the light radiate | emitted from LED5 can be improved with the reflective surface formed in the mounting surface of the light source mounting substrate 11 is also acquired.

  In the above, the embodiment in which the present invention is applied to a vehicular lamp used as a tail lamp has been described. However, the present invention can be similarly applied to a vehicular lamp used in any other lamp. Of course.

  In the above embodiment, the red LED is used as the light source, and the transparent light is used for the first inner lens and the second inner lens. However, the light source is a fiber light source or laser according to the function of the lamp. A light source or the like may be used, and the emission color of the light source and the color of the inner lens can be freely selected.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Housing 3 Outer lens 4 Light chamber 5 LED (light source)
6 1st reflector 6a 1st reflective surface 6b 2nd reflective surface 7 2nd reflector 7a 3rd reflective surface 7a1 reflective cut 8 3rd reflector 8a 4th reflective surface 9 1st inner lens 9a cross cut 10 2nd inner lens 10a vertical Flute cut 10b Horizontal flute cut 11 LED mounting board (light source mounting board)

Claims (4)

In a vehicular lamp comprising at least a light source and a reflector for reflecting light emitted from the light source in a lamp chamber defined by an outer lens covering a housing and an opening thereof,
The light source is disposed within the light emission range of the outer lens so that the light emission direction is opposite to the light emission direction from the outer lens, and light is incident on the reflection surface of the reflector. A vehicular lamp characterized by forming a reflection cut that reflects light once or twice depending on a corner.   First to fourth reflecting surfaces are provided on the reflector, and light that is reflected by the first reflecting surface and incident on the third reflecting surface out of the light emitted from the LED on the third reflecting surface is the outer lens. One type of reflection cut of the same shape and the same size that is reflected twice toward the light source, reflected by the second reflection surface and incident on the third reflection surface once toward the fourth reflection surface The vehicular lamp according to claim 1, wherein:   The vehicular lamp according to claim 1, wherein the fourth reflecting surface that covers the light source from the front side is disposed in the lamp chamber. The vehicular lamp according to claim 1, further comprising a light source mounting board having a mounting surface on which the light source is mounted, wherein the mounting surface is a reflecting surface.

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