JP6782514B2 - Vehicle direction indicator light - Google Patents

Vehicle direction indicator light Download PDF

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JP6782514B2
JP6782514B2 JP2016170342A JP2016170342A JP6782514B2 JP 6782514 B2 JP6782514 B2 JP 6782514B2 JP 2016170342 A JP2016170342 A JP 2016170342A JP 2016170342 A JP2016170342 A JP 2016170342A JP 6782514 B2 JP6782514 B2 JP 6782514B2
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light emitting
direction indicator
light bulb
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賢 徳永
賢 徳永
研介 大島
研介 大島
建作 岡村
建作 岡村
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Daihatsu Motor Co Ltd
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Description

本発明は、光源として発光ダイオードを用いた車両用方向指示灯に関する。 The present invention relates to a vehicle direction indicator lamp using a light emitting diode as a light source.

従来、自動車等の車両用方向指示灯には、光源として電球(主に、白熱電球)が利用されている。車両には、電球の断線検出回路が設けられており、電球の断線を検出した場合には、その旨を運転者に知らせるようになっている。例えば、特許文献1には、電球に電流を供給するライン上に設けられた電流検出抵抗の両端の電位差を検出し、その電位差が基準値以下であるときに電球の断線を検出する構成が開示されている。 Conventionally, light bulbs (mainly incandescent light bulbs) have been used as light sources for direction indicator lights for vehicles such as automobiles. The vehicle is provided with a light bulb disconnection detection circuit, and when a light bulb disconnection is detected, the driver is notified to that effect. For example, Patent Document 1 discloses a configuration in which a potential difference between both ends of a current detection resistor provided on a line for supplying a current to a light bulb is detected, and a disconnection of the light bulb is detected when the potential difference is equal to or less than a reference value. Has been done.

近年、光源として消費電力の少ない発光ダイオード(LED)が利用されつつある。電球をLEDに置き換えることで、消費電流を1/10程度に低減できる。しかし、LEDが断線した場合、電流検出抵抗に流れる電流は、電球が断線した場合に比較して1/10程度しか減少しないため、電流検出抵抗の両端間に生じる電位差が小さ過ぎ、LEDの断線を検出できない虞がある。 In recent years, a light emitting diode (LED) having low power consumption has been used as a light source. By replacing the light bulb with an LED, the current consumption can be reduced to about 1/10. However, when the LED is broken, the current flowing through the current detection resistor is reduced by only about 1/10 as compared with the case where the light bulb is broken. Therefore, the potential difference between both ends of the current detection resistor is too small, and the LED is broken. May not be detected.

そこで、特許文献1では、LEDに断線が発生した場合には、LEDの断線検出信号により電流検出抵抗の両端間を短絡し、電流検出抵抗の両端間の電位差を強制的に基準値以下とする短絡回路を設けている。 Therefore, in Patent Document 1, when a disconnection occurs in the LED, the disconnection detection signal of the LED short-circuits both ends of the current detection resistor, and the potential difference between both ends of the current detection resistor is forcibly set to be equal to or less than the reference value. A short circuit is provided.

特開2004−168076号公報Japanese Unexamined Patent Publication No. 2004-168076

しかし、特許文献1に開示された技術では、断線検出回路が複雑であり、かつ電子制御装置(ECU)の仕様変更が必要となり、大掛かりな上にコストの増加を招く。 However, in the technique disclosed in Patent Document 1, the disconnection detection circuit is complicated, and it is necessary to change the specifications of the electronic control device (ECU), which causes a large scale and an increase in cost.

そこで、本発明の目的の一つは、発光ダイオードを用いた車両用方向指示灯の断線を簡易な構成で検出できる車両用方向指示灯を提供することにある。 Therefore, one of the objects of the present invention is to provide a vehicle direction indicator light that can detect a disconnection of a vehicle direction indicator light using a light emitting diode with a simple configuration.

本発明の一態様に係る車両用方向指示灯は、電球と発光ダイオードとが直列接続された発光ユニットを備える。 The vehicle direction indicator light according to one aspect of the present invention includes a light emitting unit in which a light bulb and a light emitting diode are connected in series.

上記車両用方向指示灯は、電球と発光ダイオード(LED)とが直列接続されていることで、電球とLEDの少なくとも一方が断線すると、電球とLEDの双方に電流が流れない。そのため、その発光ユニットに電気的に接続された電流検出抵抗や電圧検出抵抗での電流や電圧の変化は、電球が断線した場合と同等の変化となる。つまり、電球とLEDのいずれが断線しても、電球が断線した場合と実質的に同じ状態となる。そのため、光源にLEDを用いた上記車両用方向指示灯は、電球とLEDとを直列接続した発光ユニットとする簡易な構成で、従来の電球用の断線検出回路で断線検出が可能であり、特許文献1に記載の短絡回路を設けたり、LED用の断線検出回路を設けたりする必要がなく、ECUの仕様変更も不要である。 In the vehicle direction indicator light, the light bulb and the light emitting diode (LED) are connected in series, and if at least one of the light bulb and the LED is disconnected, no current flows through both the light bulb and the LED. Therefore, the change in the current or voltage in the current detection resistor or voltage detection resistor electrically connected to the light emitting unit is the same as when the light bulb is disconnected. That is, regardless of which of the light bulb and the LED is broken, the state is substantially the same as when the light bulb is broken. Therefore, the vehicle direction indicator light using an LED as a light source has a simple configuration of a light emitting unit in which a light bulb and an LED are connected in series, and a disconnection detection circuit for a conventional light bulb can detect the disconnection. It is not necessary to provide the short-circuit circuit described in Document 1 or the disconnection detection circuit for the LED, and it is not necessary to change the specifications of the ECU.

また、上記車両用方向指示灯は、電球とLEDの双方を用いていることで、電球とLEDの応答性(立ち上がり時間)の違いを利用して、斬新な点灯パターンを実現できる。 Further, since the vehicle direction indicator light uses both a light bulb and an LED, it is possible to realize a novel lighting pattern by utilizing the difference in responsiveness (rise time) between the light bulb and the LED.

実施形態の車両用方向指示灯について、車両の前方左側に設置された車両用方向指示灯を示す外観概略図である。It is a schematic outside view which shows the vehicle direction indicator light installed on the front left side of the vehicle about the vehicle direction indicator light of embodiment. 電球の応答性と発光ダイオードの応答性との関係を示す概略説明図である。It is a schematic explanatory drawing which shows the relationship between the responsiveness of a light bulb and the responsiveness of a light emitting diode.

車両用照明システムに備えられる方向指示灯を例として、本発明の車両用方向指示灯の実施形態を以下に図面を参照しつつ説明する。車両用照明システムは、車両用方向指示灯と、断線検出手段とを備える。図1は、車両(二点鎖線で示す)の前方左側(紙面右側)に設置された車両用方向指示灯1(以下、単に方向指示灯1と呼ぶ)を示す。 An embodiment of the vehicle direction indicator light of the present invention will be described below with reference to the drawings, taking as an example the direction indicator light provided in the vehicle lighting system. The vehicle lighting system includes a vehicle direction indicator light and a disconnection detecting means. FIG. 1 shows a vehicle direction indicator light 1 (hereinafter, simply referred to as a direction indicator light 1) installed on the front left side (paper surface right side) of a vehicle (indicated by a two-dot chain line).

実施形態の方向指示灯1は、光源として、電球3と発光ダイオード(LED)4とが直列接続された発光ユニット2を備える。断線検出手段は、電流検出抵抗や電圧検出抵抗を備える。発光ユニット2と断線検出手段とは、発光ユニット2における電球3とLED4のいずれかが断線した場合に、検出電気量(電流や電圧)に変化が生じるように電気的に接続される。発光ユニット2と断線検出手段との接続として、直列接続、並列接続、両者の組み合わせが考えられる。本例では、発光ユニット2と電流検出抵抗とが電気的に直列接続されている。発光ユニット2は、一つ以上の電球3と、一つ以上のLED4とを備える。LED4は、一つでは光量が不足するため、一般的には複数のLED4で構成される。 The direction indicator lamp 1 of the embodiment includes a light emitting unit 2 in which a light bulb 3 and a light emitting diode (LED) 4 are connected in series as a light source. The disconnection detecting means includes a current detecting resistor and a voltage detecting resistor. The light emitting unit 2 and the disconnection detecting means are electrically connected so that the detected electric energy (current or voltage) changes when either the light bulb 3 or the LED 4 in the light emitting unit 2 is disconnected. As the connection between the light emitting unit 2 and the disconnection detecting means, a series connection, a parallel connection, or a combination of both can be considered. In this example, the light emitting unit 2 and the current detection resistor are electrically connected in series. The light emitting unit 2 includes one or more light bulbs 3 and one or more LEDs 4. Since the amount of light of one LED 4 is insufficient, it is generally composed of a plurality of LEDs 4.

電球3は、フィラメントのジュール熱による輻射によって発光する白熱電球やハロゲン電球、金属原子高圧蒸気中のアーク放電によって発光する高輝度放電(HID)バルブ等である。一方、LED4は、電圧を加えることによって発光する半導体素子である。 The light bulb 3 is an incandescent light bulb or a halogen light bulb that emits light by radiation due to Joule heat of a filament, a high-intensity discharge (HID) valve that emits light by arc discharge in metal atom high-pressure steam, or the like. On the other hand, the LED 4 is a semiconductor element that emits light when a voltage is applied.

電球3とLED4とが電気的に直列接続されていることで、発光ユニット2を構成するいずれかの光源(電球3やLED4)が断線すると、全ての光源に電流は流れない。そのため、その発光ユニット2に電気的に接続された電流検出抵抗や電圧検出抵抗での電流や電圧の変化は、必ず電球3が断線した場合と同等(例えば、ゼロ)の変化となる。よって、従来の電球用の断線検出回路にて発光ユニット2の断線検出が可能であり、その発光ユニット2を備える方向指示灯1の断線状況を運転者に適切に知らせることができる。 Since the light bulb 3 and the LED 4 are electrically connected in series, if any of the light sources (bulb 3 or LED 4) constituting the light emitting unit 2 is disconnected, no current flows through all the light sources. Therefore, the change of the current or the voltage in the current detection resistor or the voltage detection resistor electrically connected to the light emitting unit 2 is always the same as the change (for example, zero) when the light bulb 3 is disconnected. Therefore, the disconnection detection circuit for the conventional light bulb can detect the disconnection of the light emitting unit 2, and the driver can be appropriately notified of the disconnection status of the direction indicator light 1 provided with the light emitting unit 2.

電球3とLED4との機械的な配置形態は特に問わないが、電球3とLED4とは応答性(立ち上がり時間)が異なるため、その配置形態によっては斬新な点灯パターンを実現できる。図2は、電球3のピーク光度に到達する立ち上がり時間と、LED4のピーク光度に到達するまでの立ち上がり時間の関係を示す概略説明図である。図2に示すように、電球3の立ち上がり時間に比較して、LED4の立ち上がり時間は早い。この立ち上がり時間のタイムラグTを利用することで、発光ユニット2を擬似的に二段階に分けて点灯できる。 The mechanical arrangement of the light bulb 3 and the LED 4 is not particularly limited, but since the responsiveness (rise time) is different between the light bulb 3 and the LED 4, a novel lighting pattern can be realized depending on the arrangement. FIG. 2 is a schematic explanatory view showing the relationship between the rise time to reach the peak luminous intensity of the light bulb 3 and the rise time to reach the peak luminous intensity of the LED 4. As shown in FIG. 2, the rise time of the LED 4 is faster than the rise time of the light bulb 3. By using the time lag T of the rise time, the light emitting unit 2 can be lit in two stages in a pseudo manner.

方向指示灯1は、電球3による電球発光領域30と、LED4によるLED発光領域40とで構成される。例えば、方向指示灯1が、図1に示すような車両左右方向に長い矩形状の場合、その長手方向全長に亘って複数のLED4を並列に配置したLED発光領域40と、方向指示灯1の車両外方に電球3を配置した電球発光領域30とで構成されることが挙げられる。この配置形態とすると、方向指示灯1は、その長手方向全長に亘ってLED4が点灯した後に、若干の遅れを伴って車両外方の電球3が点灯し、車両中央側から外方に向かって流れるような点灯パターンを擬似的に実現できる。つまり、車両左側(右側)に設置された方向指示灯1には、左側(右側)に電球3を、右側(左側)にLED4を配置する。この点灯パターンでは、点灯の流れ方向と車両が曲がる方向とが一致し、視認性を向上できる。 The direction indicator light 1 is composed of a light bulb light emitting area 30 formed by the light bulb 3 and an LED light emitting area 40 formed by the LED 4. For example, when the direction indicator light 1 has a rectangular shape that is long in the left-right direction of the vehicle as shown in FIG. 1, the LED light emitting region 40 in which a plurality of LEDs 4 are arranged in parallel over the entire length in the longitudinal direction thereof, and the direction indicator light 1 It can be mentioned that it is composed of a light bulb light emitting region 30 in which the light bulb 3 is arranged outside the vehicle. In this arrangement, after the LED 4 is turned on over the entire length of the direction indicator light 1, the light bulb 3 on the outside of the vehicle is turned on with a slight delay, and the light bulb 3 is turned on from the center side of the vehicle to the outside. A flowing lighting pattern can be realized in a simulated manner. That is, in the direction indicator light 1 installed on the left side (right side) of the vehicle, the light bulb 3 is arranged on the left side (right side) and the LED 4 is arranged on the right side (left side). In this lighting pattern, the flow direction of lighting and the direction in which the vehicle turns coincide with each other, and visibility can be improved.

その他に、方向指示灯が、車両左右方向及び上下方向に同等程度の長さを有する矩形状(円形状でもよい)の場合、その外枠をLEDで囲んで配置したLED発光領域と、内側に電球を配置した電球発光領域とで構成されることが挙げられる。この配置形態とすると、方向指示灯は、外枠のLEDが点灯した後に、若干の遅れを伴ってその内側の電球が点灯し、方向指示灯の外側から中心に向かって流れるような点灯パターンを擬似的に実現できる。この点灯パターンでは、車両が曲がる側を強調することができる。勿論、外枠に電球を配置し、内側にLEDを配置した方向指示灯としてもよい。 In addition, when the direction indicator light has a rectangular shape (may be a circular shape) having the same length in the left-right direction and the up-down direction of the vehicle, the LED light emitting area in which the outer frame is surrounded by the LED and the inside It is mentioned that it is composed of a light bulb light emitting area in which a light bulb is arranged. In this arrangement, the turn signal lights have a lighting pattern in which the LED on the outer frame is turned on, then the light bulb inside the turn signal lights is turned on with a slight delay, and the turn signal lights flow from the outside to the center. It can be realized in a pseudo manner. In this lighting pattern, it is possible to emphasize the side where the vehicle turns. Of course, it may be a direction indicator lamp in which a light bulb is arranged in an outer frame and an LED is arranged inside.

本発明はこれらの例示に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。例えば、方向指示灯1を車両の後方に設置することもできるし、ドアミラーに設置することもできる。また、方向指示灯1に複数の発光ユニットを設けることもできる。 The present invention is not limited to these examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims. For example, the turn signal 1 can be installed at the rear of the vehicle or on the door mirror. Further, a plurality of light emitting units may be provided in the direction indicator lamp 1.

1 車両用方向指示灯
2 発光ユニット
3 電球 4 LED
30 電球発光領域 40 LED発光領域
1 Vehicle direction indicator 2 Light emitting unit 3 Light bulb 4 LED
30 Light bulb light emitting area 40 LED light emitting area

Claims (1)

電球と複数の発光ダイオードとが電気的に直列接続された発光ユニットを備え
前記複数の発光ダイオードは、車両左右方向に並んで配置され、
前記電球は、前記複数の発光ダイオードの並び方向の車両外方に配置される車両用方向指示灯。
It has a light emitting unit in which a light bulb and a plurality of light emitting diodes are electrically connected in series .
The plurality of light emitting diodes are arranged side by side in the left-right direction of the vehicle.
The bulb, the plurality of vehicular turning indicator lamp arrangement direction of Ru placed on the vehicle outside of the light emitting diode.
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EP3981675A4 (en) * 2019-06-04 2022-08-03 Koito Manufacturing Co., Ltd. Lamp for two-wheeled vehicle
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JPS4951178U (en) * 1972-08-12 1974-05-07
JPS4990084U (en) * 1972-11-22 1974-08-05
JPH066103U (en) * 1992-06-30 1994-01-25 株式会社ウィザードセブン Auxiliary indicator light device for motorcycles
JP2005142061A (en) * 2003-11-07 2005-06-02 Ichikoh Ind Ltd Auxiliary direction indicator lamp
JP2007001554A (en) * 2005-06-22 2007-01-11 Hiroyuki Chikakiyo Circuit for detecting blow-out of lamp bulb
JP4769214B2 (en) * 2007-03-22 2011-09-07 株式会社テーアンテー Vehicle interior lighting device
JP3137726U (en) * 2007-09-25 2007-12-06 Ipf株式会社 Hybrid light bulb for automobile
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