JP2019071204A - Vehicular lighting fixture - Google Patents

Abstract

To provide a vehicular lighting fixture capable of achieving uniform surface light emission by making the intensity of the light entering an inner lens uniform.SOLUTION: A tail lamp (vehicular lighting fixture) 1 comprises by storing at least an LED 5 which is a light source, a reflector 7 which reflects the light emitting from the LED 5 in a predetermined direction, and an inner lens 8 for transmitting the light reflected by the reflector 7, in a lamp chamber 4 defined by a housing 2 and an outer lens 3 for covering the opening. On a reflection surface 7a of the reflector 7, a diffusion step is formed and a diffusion angle of the diffusion step is changed according to the intensity of the light from the LED 5. For example, the reflection surface 7a of the reflector 7 is partitioned into a plurality of areas A1-A4 according to the intensity of the light from the LED 5, and the diffusion angle of the diffusion step of the area which receives intense light is set to be larger than the diffusion angle of the diffusion step of the area which receives weaker light than that.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a vehicle lamp that uses an LED as a light source.

  For example, instead of a conventional bulb (light bulb), an LED (Light Emitting Diode) is being used as a light source of a vehicle lamp such as a tail lamp disposed at the rear left and right of the vehicle. Although this LED has advantages such as high luminous efficiency, long life, and power saving, it emits point light with strong directivity since it emits light with strong directivity.

  However, even in a vehicle lamp using an LED as a light source, there is an increasing demand for surface light emission to make the light emitting surface emit light uniformly. Patent Document 1 proposes a vehicle lamp that realizes such surface light emission. Here, the vehicle lamp proposed in Patent Document 1 will be described below based on FIG.

  That is, FIG. 8 is a side cross-sectional view of a vehicle lamp proposed in Patent Document 1, and the vehicle lamp 101 shown in the figure functions as a tail lamp disposed at the left and right of the rear of the vehicle. In a lamp chamber 104 defined by an outer lens 103 covering the opening, a plurality of LEDs 105 as light sources, a first inner lens 106 for transmitting light emitted from the LEDs 105, and the first inner lens 106 are provided. A reflector 107 for reflecting the transmitted light toward the rear of the vehicle (left in FIG. 8) and a second inner lens 108 for transmitting the reflected light reflected by the reflector 107 are accommodated.

  Here, diffusion steps having a pitch of 0.5 mm or less are respectively formed on the entrance surface and / or exit surface of the first inner lens 106 and on the entrance surface and / or exit surface of the second inner lens 108. In the reflective surface of the above, a diffusion step is formed which is formed of a lattice-like step surface having a pitch of 2 mm or less.

  Thus, in the vehicle lamp 101 configured as described above, the light emitted from the plurality of LEDs 105 is diffused when passing through the first inner lens 106, and the diffused light is reflected by the reflector 107. Spread further when The light reflected by the reflector 107 is further diffused when passing through the second inner lens 108, passes through the transparent outer lens 103, and is emitted to the rear of the vehicle. As described above, according to the vehicular lamp 101, since the point emission by the LED 105 is converted to surface emission by the first inner lens 106, the reflector 107, and the second inner lens 108, the vehicular lamp functions as a tail lamp. A uniform surface emission of 101 is realized.

JP, 2015-076249, A

  By the way, since the LED emits light with strong directivity as described above, the intensity difference differs depending on the emission angle of the light.

  Here, in the vehicle lamp 101 shown in FIG. 8 proposed in Patent Document 1, the entrance surface and / or exit surface of the first and second inner lenses 106 and 108 and the reflector for realizing uniform surface light emission Diffusion steps such as fish-eye cut are formed on the reflective surface of 107, but the diffusion angles of these diffusion steps are set identical regardless of the positional relationship with the LED 105 (intensity of received light) Therefore, realization of uniform surface light emission is insufficient.

  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 capable of achieving uniform surface light emission by making the intensity of light incident on an inner lens uniform. It is in.

In order to achieve the above object, according to the invention of claim 1, in the lamp chamber defined by the housing and the outer lens covering the opening, at least an LED as a light source and light emitted from the LED in a predetermined direction In a vehicle lamp including a reflector for reflecting light and an inner lens for transmitting light reflected by the reflector,
A diffusion step is formed on the reflective surface of the reflector, and the diffusion angle of the diffusion step is changed according to the intensity of light from the LED.

  The invention according to claim 2 is the invention according to claim 1, wherein the reflecting surface of the reflector is divided into a plurality of areas according to the light intensity from the LED, and the diffusion step of the area receiving strong light is diffused. The angle is set to be larger than the diffusion angle of the diffusion step in the area receiving weaker light.

  The invention according to claim 3 is characterized in that in the invention according to claim 1 or 2, the diffusion step is a fisheye cut, and the diffusion angle is changed by changing the curvature of the fisheye cut. Do.

  According to the invention of claims 1 and 2, the diffusion angle of the diffusion step formed on the reflective surface of the reflector is changed according to the intensity of light from the LED, for example, the reflective surface of the reflector is the light from the LED Since the diffusion angle of the diffusion step of the area receiving strong light is set larger than the diffusion angle of the diffusion step of the area receiving weak light, the strong light is The light can be incident on the side far from the center of the lens and the weak light can be incident on the side close to the center of the inner lens. As a result, the intensity of light incident on the inner lens can be made uniform, and uniform surface light emission of the vehicle lamp can be realized.

  According to the invention of claim 3, when the diffusion step formed in the inner lens is a fisheye cut, the diffusion angle of the fisheye cut can be changed by changing the curvature.

It is a front view of the rear combination lamp containing the vehicle lamp concerning the present invention. It is the sectional view on the AA line of FIG. It is a front view of a reflector of a vehicular lamp concerning the present invention. It is the B section enlarged detail of FIG. It is a figure which shows the relationship between the utilization angle of LED, and the intensity of light. It is a schematic plan view which shows a mode that it diffuses by the spreading | diffusion step of the light radiate | emitted from LED and reflected by a reflector. It is a figure which shows the relationship between the utilization angle of LED, and a luminous flux ratio. It is a sectional side view of the vehicle lamp proposed in patent document 1. FIG.

  Embodiments of the present invention will be described below based on the attached drawings.

  FIG. 1 is a front view of a rear combination lamp including a vehicle lamp according to the present invention, and FIG. 2 is a sectional view taken along the line A-A of FIG. As shown in FIG. 2, the stop lamp 20, the turn signal lamp 30, and the tail lamp 1 are accommodated integrally in the lamp chamber 4 defined by the housing 2 and the outer lens 3 covering the opening thereof. It is configured. In addition, since the basic configuration of the rear combination lamp 10 is the same on the left and right, only one of them will be illustrated and described below.

  In the rear combination lamp 10, as shown in FIG. 1, a laterally elongated stop lamp 20 is disposed at the top, and a laterally elongated turn signal lamp 30 is disposed below the same. Then, the L-shaped tail lamp 1 is disposed so as to cover the stop lamp 20 and the turn signal lamp 30 from the periphery. The outer lens 3 is integrally formed by insert molding of a red transparent integral part covering the stop lamp 20 and the tail lamp 1 and a white transparent clear part covering the turn signal lamp 30, respectively.

  Thus, the tail lamp 1 is an object to which the present invention is applied, and the tail lamp 1 is a light source in a lamp chamber 4 defined by the housing 2 and the outer lens 3 as shown in FIG. An LED 5, a flat substrate 6 mounting the LED 5 on the upper surface, a reflector 7 for reflecting light emitted from the LED 5 toward the rear of the vehicle (rightward in FIG. 2), and light transmitted by the reflector 7 are transmitted. The inner lens 8 is accommodated.

  The reflector 7 is formed with a curved parabolic reflection surface 7a, and the inner lens 8 is disposed in front of the light emitting direction of the reflector 7 (rightward in FIG. 2).

  Here, the reflector 7 is integrally formed with a cylindrical extension 7A extending downward from the bottom surface 7b, and a surface connected to the reflection surface 7a of the extension 7A is similar to the reflection surface 7a. Another parabolic reflecting surface 7c is formed.

  Further, as shown in FIG. 2, the lower surface opening of the extension 7A integrally formed with the reflector 7 is covered by the substrate 6 disposed horizontally, whereby a space is formed inside the extension 7A. S is formed. Here, seven LEDs 5 (only one is shown in FIG. 2) are juxtaposed at appropriate intervals in the lateral direction (the direction perpendicular to the sheet of FIG. 2) on the upper surface of the central portion of the substrate 6. Each LED 5 is mounted on the substrate 6 in a direction such that the light emission direction is vertically upward.

  By the way, in the present embodiment, as shown in FIG. 2, a hole for passing light emitted upward from each LED 5 to a portion corresponding to a total of seven LEDs 5 on the bottom surface 7b of the reflector 7 7 d (only one is shown in FIG. 2) are respectively formed, and each LED 5 is disposed at the bottom of the space S behind the hole 7 d. For this reason, each LED 5 can not be viewed directly from the outside.

  Further, the inner lens 8 disposed on the inner side of the outer lens 3 ahead of the reflector 7 in the light emission direction is made of a transparent resin such as acrylic or polycarbonate having high light transmittance, and the incident surface (inner surface) 8a There are a number of diffusion steps (not shown) for light diffusion. In the present embodiment, the diffusion step is formed only on the entrance surface 8a of the inner lens 8. However, the diffusion step is formed on only the exit surface (outer surface) 8b or both the entrance surface 8a and the exit surface 8b. Also good.

  Thus, in the tail lamp 1 configured as described above, when current is supplied from a power source (not shown) to each of the LEDs 5 to activate the LEDs 5, one of the light emitted upward from each of the LEDs 5 The light is reflected by the reflection surface 7 a of the reflector 7, and the other light is reflected by the reflection surface 7 c of the extension 7 A formed in the reflector 7. Then, the reflected light passes through the inner lens 8 and travels to the rear of the vehicle, and finally passes through the outer lens 3 and is emitted as red light toward the rear of the vehicle, so the tail lamp 1 lights up. Demonstrate a function.

  Next, the gist of the present invention will be described below with reference to FIGS.

  3 is a front view of a reflector of a vehicle lamp according to the present invention, FIG. 4 is an enlarged detail view of a portion B of FIG. 3, FIG. 5 is a diagram showing a relationship between usage angle of LED and light intensity, 7 is a schematic plan view showing how the light emitted from the light and diffused by the reflector is diffused by the diffusion step, and FIG. 7 is a view showing the relationship between the use angle of the LED and the luminous flux ratio.

  As shown in FIG. 3, a large number of diffusion cuts 7e are formed on the reflection surface 7a (the reflection surface 7c of the extension 7A is not shown) of the reflector 7 provided in the tail lamp 1 according to the present embodiment. There is. Here, in the present embodiment, as shown in FIG. 6, the diffusion cut 7e is configured by a fisheye cut.

  By the way, although light with strong directivity is emitted from each LED 5, as shown in FIG. 5, the light emitted from the LED 5 is L1, L2, L3 according to the emission angle (hereinafter referred to as "use angle") And L4, that is, light emitted in the range of use angle 0 ° to 10 ° is L1, light emitted in the range of use angle 10 ° to 20 ° is L2, and use angle 20 ° to 30 ° If the light emitted in the range of L3 and the light emitted in the range of use angles of 30 ° to 40 ° are L4, the intensities of the lights L1 to L4 become weaker in this order. That is, the relationship between the intensities of the lights L1 to L4 is L1> L2> L3> L4. Here, the light intensity (relative value) when the intensity of the strongest light (light with a use angle of 0 °) is 1.0 is defined as the luminous flux ratio, and the value for the utilization angle of the luminous flux ratio is shown in FIG. As shown in Table 7 and Table 1, as apparent from these, the luminous flux ratios of the lights L1, L2, L2, and L4 are 0.95, 0.8, 0.5, and 0.2, respectively.

而して、本実施の形態は、リフレクタ７の反射面７ａに形成された拡散ステップ７ｅの拡散角（エーミング角）を各ＬＥＤ５からの光の強さに応じて変化させたことを特徴としている。具体的には、図４に示すように、リフレクタ７の反射面７ａをＬＥＤ５からの光の強さに応じて４つのエリアＡ１，Ａ２，Ａ３，Ａ４に区画し、強い光を受けるエリアの拡散ステップ７ｅの拡散角を、それよりも弱い光を受けるエリアの拡散ステップ７ｅの拡散角よりも大きく設定したことを特徴とする。尚、魚眼カットで構成された拡散カット７ｅの拡散角は、魚眼カットの曲率を変えることによって変化させることができる。

Thus, the present embodiment is characterized in that the diffusion angle (aiming angle) of the diffusion step 7 e formed on the reflection surface 7 a of the reflector 7 is changed according to the light intensity from each of the LEDs 5. . Specifically, as shown in FIG. 4, the reflecting surface 7a of the reflector 7 is divided into four areas A1, A2, A3 and A4 in accordance with the intensity of light from the LED 5, and diffusion of the area receiving strong light It is characterized in that the diffusion angle of the step 7e is set larger than the diffusion angle of the diffusion step 7e of the area receiving weaker light. In addition, the diffusion angle of the diffusion cut 7e configured by the fisheye cut can be changed by changing the curvature of the fisheye cut.

  More specifically, as shown in FIG. 6 and Table 1, of the reflection surface 7a of the reflector 7, the diffusion angle of the diffusion cut 7e in the area A1 receiving the strongest light L1 is set to 19 °, the light L1 The diffusion angle of diffusion cut 7e in area A2 receiving weaker light L2 is 16 °, the diffusion angle of diffusion cut 7e in area A3 receiving light L3 weaker than light L2 is 10 °, and light L4 weaker than light L3 The diffusion angle of the diffusion cut 7e in the area A4 to be received is set to 4 °. The diffusion angle of the diffusion cut (not shown) formed on the reflective surface 7c of the extension 7A formed on the reflector 7 is set similarly to the diffusion angle of the diffusion cut formed on the reflective surface 7a. It is done.

  As described above, in the present embodiment, the diffusion angle of the diffusion step 7 e formed on the reflective surface 7 a of the reflector 7 is changed according to the intensity of the light from the LED 5, specifically, the reflection of the reflector 7 The surface 7a is divided into four areas A1 to A4 according to the light intensity from the LED 5, and the diffusion angle of the diffusion step 7e of the area A1 receiving the strongest light L1 is set the largest, and the light L2 weaker than that , L3 and L4, since the diffusion angles of the diffusion step 7e in the areas A2, A3 and A4 are successively set smaller, as shown in FIG. The light can be incident on the side close to the center of the inner lens 8. As a result, the intensity of light incident on the inner lens 8 can be made uniform, and uniform surface light emission of the tail lamp 1 can be realized.

  Here, the luminous flux values of the lights L1 to L4 (values indicating the light intensity of the incident surface) in the inner lens 8 are shown in Table 1, but the luminous flux values are all equal to 0.05 for the lights L1 to L4. It shows.

  In the present embodiment, since the diffusion step is also formed on the incident surface 8 a and / or the emission surface 8 b of the inner lens 8, the light reflected by the reflector 7 is diffused when it is transmitted through the inner lens 8. Spread further by steps. And the further uniform surface light emission of the tail lamp 1 is attained by the spreading | diffusion of this light.

  By the way, in the above embodiment, although the reflective surface 7a of the reflector 7 is divided into four areas A1 to A4 according to the intensity of light received, it may be divided into a plurality of two or more areas, or The diffusion angle of the diffusion step 7e formed on the reflective surface 7a may be continuously changed according to the intensity of light.

  Also, although the embodiment has been described above in which the present invention is applied to a tail lamp provided in a rear combination lamp, the present invention is not limited to the tail lamp, but any optional items such as a headlamp, DRL (Day Running Lamp), license lamp, etc. Of course, the present invention is similarly applicable to a vehicle lamp.

1 Tail lamp (lights for vehicles)
2 housing 3 outer lens 4 light chamber 5 LED
6 substrate 7 reflector 7A reflector extension 7a reflector reflection surface 7b reflector bottom surface 7c reflector reflection surface 7d reflector hole 7e reflection surface diffusion step 8 inner lens 8a inner lens entrance surface 8b inner lens exit surface 10 Rear combination lamp 20 Stop lamp 30 Turn signal lamp A1 to A4 Reflector area L1 to L4 Light S Space x LED light axis

Claims (3)

At least an LED as a light source, a reflector for reflecting light emitted from the LED in a predetermined direction, and an inner for transmitting light reflected by the reflector into a lamp chamber defined by a housing and an outer lens covering the opening thereof In a vehicle lamp including a lens,
And a diffusion step is formed on the reflection surface of the reflector, and a diffusion angle of the diffusion step is changed according to the intensity of light from the LED.   The reflective surface of the reflector is divided into a plurality of areas according to the light intensity from the LED, and the diffusion angle of the diffusion step of the area receiving strong light is the diffusion angle of the area receiving the weaker light The vehicular lamp according to claim 1, characterized in that it is set larger than the corner. The vehicular lamp according to claim 1 or 2, wherein the diffusion step is a fisheye cut, and the diffusion angle is changed by changing the curvature of the fisheye cut.

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