JP2014159253A - Vehicular lighting fixture - Google Patents

Vehicular lighting fixture Download PDF

Info

Publication number
JP2014159253A
JP2014159253A JP2013031421A JP2013031421A JP2014159253A JP 2014159253 A JP2014159253 A JP 2014159253A JP 2013031421 A JP2013031421 A JP 2013031421A JP 2013031421 A JP2013031421 A JP 2013031421A JP 2014159253 A JP2014159253 A JP 2014159253A
Authority
JP
Japan
Prior art keywords
load
duty ratio
lights
control circuit
lighting circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2013031421A
Other languages
Japanese (ja)
Other versions
JP6263839B2 (en
Inventor
Tomohiro Okamoto
智博 岡本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ichikoh Industries Ltd
Original Assignee
Ichikoh Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ichikoh Industries Ltd filed Critical Ichikoh Industries Ltd
Priority to JP2013031421A priority Critical patent/JP6263839B2/en
Publication of JP2014159253A publication Critical patent/JP2014159253A/en
Application granted granted Critical
Publication of JP6263839B2 publication Critical patent/JP6263839B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)

Abstract

PROBLEM TO BE SOLVED: To solve the following problem: variations are caused in appearances immediately before the most important lights-out operation among lights-out operations under lighting control, in the case of a conventional vehicular lighting fixture.SOLUTION: A vehicular lighting fixture of the present invention includes a PWM lighting control circuit 1, a load lighting circuit 2, and a load 3. The load 3 serving as a light source performs a lights-out operation under lighting control via the load lighting circuit 2 by the PWM lighting control circuit 1. The PWM lighting control circuit 1 sets an inclination of a change in duty ratio immediately before complete lights-out as a linear type. Consequently, appearances immediately before the most important lights-out operation among lights-out operations under lighting control can be set uniform.

Description

この発明は、光源が調光消灯する車両用灯具に関するものである。   The present invention relates to a vehicular lamp whose light source is dimmed and extinguished.

この種の車両用灯具は、従来からある（たとえば、特許文献１）。以下、従来の車両用灯具について説明する。従来の車両用灯具は、ＰＷＭ信号発生部と発光制御部とにより、ＬＥＤ光源を、バルブ光源の消灯の立下りに模して、調光消灯させるもの（すなわち、時間的傾きを有して明るさを変化させて消灯させるもの）である。   This type of vehicular lamp is conventionally known (for example, Patent Document 1). Hereinafter, a conventional vehicle lamp will be described. A conventional vehicular lamp uses a PWM signal generation unit and a light emission control unit to cause an LED light source to be dimmed and imitated by the falling edge of the bulb light source (that is, bright with a temporal inclination). The lamp is turned off by changing the height).

特表２００９−０１９９４５号公報JP 2009-019945 gazette

ところが、前記の従来の車両用灯具は、発光制御部の部品の特性のばらつきにより、調光消灯のうち最も重要な消灯間際の見栄えにばらつきが生じている。   However, the above-described conventional vehicular lamp has a variation in the appearance of the most important lighting immediately before the dimming off due to variations in the characteristics of the components of the light emission control unit.

この発明が解決しようとする課題は、従来の車両用灯具では、調光消灯のうち最も重要な消灯間際の見栄えにばらつきが生じている、という点にある。   The problem to be solved by the present invention is that, in the conventional vehicular lamp, there is a variation in the most important appearance just before turning off the dimming.

この発明（請求項１にかかる発明）は、ＰＷＭ調光制御回路と、ＰＷＭ調光制御回路により調光消灯する光源と、を備え、ＰＷＭ調光制御回路が、デューティ比の少なくとも第１所定値から第２所定値までの間のデューティ比変化の傾きを直線式とする、ことを特徴とする。   The present invention (the invention according to claim 1) includes a PWM dimming control circuit and a light source that is dimmed and extinguished by the PWM dimming control circuit, and the PWM dimming control circuit has at least a first predetermined value of the duty ratio. The slope of the change in duty ratio between 1 and the second predetermined value is a linear expression.

この発明（請求項２にかかる発明）は、第１所定値から第２所定値までの範囲が、ＰＷＭ調光制御回路と光源との間に接続される負荷点灯回路のばらつきの範囲と、同等もしくはほぼ同等か、あるいは、ばらつきの範囲より大である、ことを特徴とする。   In the present invention (the invention according to claim 2), the range from the first predetermined value to the second predetermined value is equivalent to the range of variation of the load lighting circuit connected between the PWM dimming control circuit and the light source. Alternatively, it is approximately equal or larger than the range of variation.

この発明の車両用灯具は、デューティ比の少なくとも第１所定値から第２所定値までの間（すなわち、少なくとも消灯間際（消灯付近）の間）のデューティ比変化の傾きを直線式とする。このために、部品の特性のばらつきにより、応答可能な最小デューティ比にばらつきが生じた場合であっても、デューティ比変化の傾きが直線であって一定である。これにより、調光消灯のうち最も重要な消灯間際の見栄えのばらつきをなくして、消灯間際の見栄えを揃えることができる。   In the vehicular lamp according to the present invention, the slope of the duty ratio change between at least the first predetermined value and the second predetermined value of the duty ratio (that is, at least just before extinction (near extinction)) is linear. Therefore, even when the minimum duty ratio that can be responded varies due to variations in the characteristics of the components, the slope of the change in duty ratio is a straight line and constant. Thereby, it is possible to eliminate the variation in the appearance of the most important lighting out of the dimming and to make the appearance of the lighting just before turning off.

図１は、この発明にかかる車両用灯具の実施形態１を示す構成ブロック図である。FIG. 1 is a configuration block diagram showing Embodiment 1 of a vehicular lamp according to the present invention. 図２は、部品の特性のばらつきにより、応答可能な最小デューティ比に生じるばらつきを示す説明図である。FIG. 2 is an explanatory diagram showing variations that occur in the minimum duty ratio that can be responded due to variations in the characteristics of the components. 図３は、デューティ比変化の傾きが直線の場合におけるデューティ比変化の傾きが一定であることを示す説明図である。FIG. 3 is an explanatory diagram showing that the slope of the duty ratio change is constant when the slope of the duty ratio change is a straight line. 図４は、デューティ比変化の傾きが２次曲線の場合におけるデューティ比変化の傾きがばらついていることを示す説明図である。FIG. 4 is an explanatory diagram showing that the slope of the duty ratio change varies when the slope of the duty ratio change is a quadratic curve. 図５は、部品の特性のばらつきによる応答可能な最小デューティ比のばらつきを示す説明図である。FIG. 5 is an explanatory diagram showing variations in the minimum duty ratio that can be responded to due to variations in the characteristics of the components. 図６は、この発明にかかる車両用灯具の実施形態２を示すデューティ比変化の傾きの説明図である。FIG. 6 is an explanatory diagram of the inclination of the duty ratio change showing the second embodiment of the vehicular lamp according to the present invention.

以下、この発明にかかる車両用灯具の実施形態（実施例）の２例を図面に基づいて詳細に説明する。なお、この実施形態によりこの発明が限定されるものではない。図２、図３、図４、図６において、縦軸は、電力の出力を示し、横軸は、時間を示す。   Hereinafter, two examples of an embodiment (example) of a vehicular lamp according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. 2, 3, 4, and 6, the vertical axis indicates power output, and the horizontal axis indicates time.

（実施形態１の説明）
以下、この実施形態１にかかる車両用灯具の構成について説明する。この実施形態１にかかる車両用灯具は、光量を調節する目的でＰＷＭ調光制御を行う。この実施形態１にかかる車両用灯具は、図１に示すように、ＰＷＭ調光制御回路１と、負荷点灯回路２と、負荷３と、を備える。この実施形態１にかかる車両用灯具は、光量を調節する目的でＰＷＭ調光制御を行うものである。 (Description of Embodiment 1)
Hereinafter, the configuration of the vehicular lamp according to the first embodiment will be described. The vehicular lamp according to the first embodiment performs PWM dimming control for the purpose of adjusting the amount of light. As illustrated in FIG. 1, the vehicular lamp according to the first embodiment includes a PWM dimming control circuit 1, a load lighting circuit 2, and a load 3. The vehicular lamp according to the first embodiment performs PWM dimming control for the purpose of adjusting the amount of light.

前記ＰＷＭ調光制御回路１は、後段に接続されている前記負荷点灯回路２に対する点消灯制御指示を行う。指示は、図５（Ａ）に示すように、ＰＷＭのデューティ比（一周期に対する点灯時間もしくは消灯時間の割合。単位は％）を０〜１００％の間で変化させることで行う。１００％で完全点灯、０％で完全消灯となる。前記ＰＷＭ調光制御回路１においては、前記負荷点灯回路２への電源供給自体のＯＮ／ＯＦＦをＰＷＭとする場合と、前記負荷点灯回路２に電源を常時供給し、前記負荷点灯回路２への別の信号入力ラインにＰＷＭの信号を入力する場合と、がある。   The PWM dimming control circuit 1 issues an on / off control instruction to the load lighting circuit 2 connected to the subsequent stage. As shown in FIG. 5A, the instruction is performed by changing the PWM duty ratio (ratio of lighting time or extinguishing time with respect to one cycle. The unit is%) between 0 and 100%. 100% is completely lit, 0% is completely unlit. In the PWM dimming control circuit 1, when the ON / OFF of the power supply itself to the load lighting circuit 2 is set to PWM, the power is always supplied to the load lighting circuit 2, and the load lighting circuit 2 is supplied with power. There is a case where a PWM signal is input to another signal input line.

前記負荷点灯回路２は、図５（Ｂ）、（Ｃ）に示すように、入力されたＰＷＭ（図５（Ａ）参照）に応じて前記負荷３に供給する電力供給のＯＮ／ＯＦＦを行う。ここで、前記負荷点灯回路２が理想的な負荷点灯回路であれば、図５（Ａ）に示す入力波形＝出力波形となる。ところが、実際の前記負荷点灯回路２の内部には、容量成分（コンデンサ、半導体の寄生容量など）・インダクタンス成分（コイル、配線など）が含まれている。このために、入力波形に対して「鈍る」傾向がある。すなわち、入力波形のデューティ比が小さい領域においては、図５（Ｂ）、（Ｃ）に示すように、出力を行えない現象（追従できない場合）が生じる。   As shown in FIGS. 5B and 5C, the load lighting circuit 2 performs ON / OFF of power supply supplied to the load 3 in accordance with the input PWM (see FIG. 5A). . Here, if the load lighting circuit 2 is an ideal load lighting circuit, the input waveform = the output waveform shown in FIG. However, the actual load lighting circuit 2 includes capacitance components (capacitors, semiconductor parasitic capacitances, etc.) and inductance components (coils, wirings, etc.). For this reason, there is a tendency to “dull” with respect to the input waveform. That is, in the region where the duty ratio of the input waveform is small, as shown in FIGS. 5B and 5C, a phenomenon in which output cannot be performed (when tracking cannot be performed) occurs.

たとえば、特性Ａの前記負荷点灯回路２の場合は、図２（Ｂ）、図５（Ｂ）に示すように、デューティ比がＸ％のとき、前記ＰＷＭ調光制御回路１からの入力に対して、出力できなくなる。この特性Ａの前記負荷点灯回路２の応答可能な最小デューティ比がＸ％である。また、特性Ｂの前記負荷点灯回路２の場合は、図２（Ｃ）、図５（Ｃ）に示すように、デューティ比がＹ％のとき、前記ＰＷＭ調光制御回路１からの入力に対して、出力できなくなる。この特性Ａの前記負荷点灯回路２の応答可能な最小デューティ比がＹ％である。   For example, in the case of the load lighting circuit 2 having the characteristic A, as shown in FIGS. 2B and 5B, when the duty ratio is X%, the input from the PWM dimming control circuit 1 is Output is not possible. The minimum duty ratio with which the load lighting circuit 2 having this characteristic A can respond is X%. In the case of the load lighting circuit 2 having the characteristic B, as shown in FIGS. 2C and 5C, when the duty ratio is Y%, the input from the PWM dimming control circuit 1 Output is not possible. The minimum duty ratio with which the load lighting circuit 2 having this characteristic A can respond is Y%.

前記負荷３は、前記負荷点灯回路２から供給される電力（図５（Ｂ）、（Ｃ）参照）を用いて光を放射する。前記負荷３は、主に、半導体型光源（たとえば、ＬＥＤ、ＯＥＬまたはＯＬＥＤ（有機ＥＬ）などの自発光半導体型光源）などを使用し、あるいは、電球光源（ＨＩＤなどの放電灯光源、ハロゲン光源、白熱光源）などを使用する場合もある。   The load 3 emits light using electric power (see FIGS. 5B and 5C) supplied from the load lighting circuit 2. The load 3 mainly uses a semiconductor light source (for example, a self-luminous semiconductor light source such as LED, OEL, or OLED (organic EL)), or a light bulb light source (discharge lamp light source such as HID, halogen light source). Incandescent light source) may be used.

ここで、車両用灯具においては、主に質感向上などの目的でＰＷＭ調光制御を実施する場合に、点灯状態から消灯状態に切り替える時に、図３、図４に示すように、デューティ比を時間的傾きを有して下げていく（小さくしていく）制御を行うことがある。このＰＷＭ調光制御においては、特許文献１に示すように、視感度特性を考慮してデューティ比が小さくなるほど傾きを寝かせていく２次曲線的なカーブを描く制御とするのが一般的である（図４参照）。このとき、見栄え上で最も重要な点は、完全消灯（０％）直前（目安としては、５００ｍｓ以下程度）における傾きである。この傾きが大きいほど急峻に消灯するように見える。   Here, in the vehicular lamp, when the PWM dimming control is performed mainly for the purpose of improving the texture, the duty ratio is set to the time as shown in FIGS. There is a case where the control is performed with the target inclination being lowered (decreasing). In this PWM dimming control, as shown in Patent Document 1, it is common to draw a quadratic curve in which the slope is lowered as the duty ratio decreases in consideration of the visibility characteristic. (See FIG. 4). At this time, the most important point in appearance is the slope immediately before complete extinction (0%) (as a guideline, about 500 ms or less). The larger the slope, the sharper the light is turned off.

そして、前記負荷点灯回路２が理想的な特性を有している場合は、「前記ＰＷＭ調光制御回路１の出力デューティ比（図５（Ａ）を参照）＝前記負荷点灯回路２の出力デューティ比（図５（Ｂ）、（Ｃ）参照）＝前記負荷３の点消灯デューティ比」となり、所望の調光消灯の見栄えを実現することができる。   When the load lighting circuit 2 has an ideal characteristic, “output duty ratio of the PWM dimming control circuit 1 (see FIG. 5A) = output duty of the load lighting circuit 2” Ratio (see FIGS. 5B and 5C) = the duty ratio of turning on and off the load 3, and a desired appearance of dimming can be realized.

しかしながら、実際の前記負荷点灯回路２においては、前記のとおり、各種成分の影響により、入力波形のデューティ比が小さい領域において、出力を行えない現象がある。また、実際の前記負荷点灯回路２における各種成分は、部品の特性ばらつきや温度特性などにより、製品個々で一定の値とならない。このために、応答可能な最小デューティ比（図中のＸ％、Ｙ％を参照）にばらつきが生じる。この応答可能な最小デューティ比（Ｘ％、Ｙ％）にばらつきにより、デューティ比変化の傾きが前記の２次曲線式の場合（図４参照）、消灯間際のデューティ比の傾きが異なってしまう。このために、滑らかに消灯するものと急峻に消灯するものとが生じている。たとえば、図４に示すように、応答可能な最小デューティ比がＸ％の場合は、デューティ比の傾きが小さいので（図４のＡ２参照）、滑らかに消灯する。一方、応答可能な最小デューティ比がＹ％の場合は、デューティ比の傾きが大きいので（図４のＢ２参照）、急峻に消灯する。   However, in the actual load lighting circuit 2, as described above, there is a phenomenon in which output cannot be performed in a region where the duty ratio of the input waveform is small due to the influence of various components. In addition, various components in the actual load lighting circuit 2 do not become constant values for each product due to characteristic variations of parts, temperature characteristics, and the like. For this reason, variation occurs in the minimum duty ratio that can be responded (see X% and Y% in the figure). Due to variations in the minimum duty ratio (X%, Y%) that can be responded, when the slope of the change in the duty ratio is the above-mentioned quadratic curve formula (see FIG. 4), the slope of the duty ratio immediately before the light is turned off is different. For this reason, there are those that turn off smoothly and those that turn off sharply. For example, as shown in FIG. 4, when the minimum duty ratio that can be responded is X%, since the gradient of the duty ratio is small (see A2 in FIG. 4), the light is smoothly turned off. On the other hand, when the minimum duty ratio that can be responded is Y%, the duty ratio has a large gradient (see B2 in FIG. 4), and thus the light is extinguished sharply.

ここで、この実施形態１にかかる車両用灯具は、応答可能な最小デューティ比が変動した場合においても、前記負荷３の消灯見栄えを同一に揃える手段として、図２、図３に示すように、Ｃの時点から開始する２次曲線式のカーブの消灯付近（Ｄの時点以降）を直線式とするものである。   Here, in the vehicular lamp according to the first embodiment, as shown in FIG. 2 and FIG. 3, as means for aligning the appearance of turning off the load 3 even when the minimum duty ratio that can be responded fluctuates, The vicinity of the extinction of the curve of the quadratic curve equation starting from the time point C (after the time point D) is a linear equation.

この結果、この実施形態１にかかる車両用灯具は、応答可能な最小デューティ比において、Ｘ％、Ｙ％のように、ばらつきが生じる場合においても、消灯見栄えを揃えることができる。たとえば、図３に示すように、応答可能な最小デューティ比がＸ％の場合におけるデューティ比の傾き（図３のＡ１参照）と、応答可能な最小デューティ比がＹ％の場合におけるデューティ比の傾き（図３のＢ１参照）とは、同一であるから、消灯見栄えを揃えることができる。すなわち、特性Ａの前記負荷点灯回路２からの出力（電力供給）により点消灯する前記負荷３の消灯見栄えと、特性Ｂの前記負荷点灯回路２からの出力（電力供給）により点消灯する前記負荷３の消灯見栄えと、が揃う。このように、この実施形態１にかかる車両用灯具は、前記ＰＷＭ調光制御回路１により、前記負荷点灯回路２のばらつきを吸収して、前記負荷３の消灯見栄えを揃えることができる。   As a result, the vehicular lamp according to the first embodiment can make the appearance of turning off even when the responsive minimum duty ratio varies such as X% and Y%. For example, as shown in FIG. 3, the slope of the duty ratio when the minimum duty ratio that can be responded is X% (see A1 in FIG. 3), and the slope of the duty ratio when the minimum duty ratio that can be responded is Y%. Since it is the same as (refer to B1 in FIG. 3), it is possible to align the appearance of turning off. That is, the appearance of turning off the load 3 that is turned on / off by the output (power supply) from the load lighting circuit 2 having the characteristic A, and the load that is turned on / off by the output (power supply) from the load lighting circuit 2 having the characteristic B The 3 lights off look is complete. As described above, in the vehicular lamp according to the first embodiment, the PWM dimming control circuit 1 can absorb the variation of the load lighting circuit 2 and can make the load 3 to be turned off.

たとえば、前記負荷３が車両の左右にそれぞれ装備されるサイドマーカーランプの場合、左側のサイドマーカーランプの消え方と右側のサイドマーカーランプの消え方とが揃う。また、前記負荷３が複数個のランプユニットから構成されているコーナリングランプの場合、複数個のランプユニットの消え方が揃う。さらに、前記負荷３が室内灯のランプの場合、交換前のランプの消え方と交換後のランプの消え方とが揃う。   For example, when the load 3 is a side marker lamp provided on each of the left and right sides of the vehicle, the left side marker lamp disappears and the right side marker lamp disappears. In the case where the load 3 is a cornering lamp composed of a plurality of lamp units, the plurality of lamp units disappear. Further, when the load 3 is a room lamp, the lamp disappears before replacement and the lamp disappears after replacement.

この実施形態１にかかる車両用灯具において、前記の直線式の範囲は、図２に示すように、前記負荷点灯回路２のばらつきの範囲Ｄ１に、所定の範囲Ｄ２を、付加した範囲Ｄ３である。前記の所定の範囲Ｄ２を最小限として、前記の直線式の範囲Ｄ３を最小限とする。この結果、図２、図３に示すように、消灯開始時点Ｃから直線式開始時点Ｄまでの間を、前記の２次曲線式とすることができる。このために、２次曲線式とした目的である視感度特性を維持することができる。すなわち、前記負荷３の消灯が違和感のある消え方とはならない。   In the vehicular lamp according to the first embodiment, the linear range is a range D3 obtained by adding a predetermined range D2 to the variation range D1 of the load lighting circuit 2 as shown in FIG. . The predetermined range D2 is minimized, and the linear range D3 is minimized. As a result, as shown in FIG. 2 and FIG. 3, the above-mentioned quadratic curve formula can be obtained between the extinction start time C and the linear formula start time D. For this reason, it is possible to maintain the visibility characteristic which is the purpose of the quadratic curve formula. That is, turning off the load 3 is not an uncomfortable way of disappearing.

なお、この実施形態１にかかる車両用灯具においては、前記の直線式の範囲を、少なくとも、前記負荷点灯回路２のばらつきの範囲Ｄ１としても良い。すなわち、デューティ比の少なくとも第１所定値Ｙ％から第２所定値Ｘ％までの間のデューティ比変化の傾きを直線式とするものであっても良い。第１所定値Ｙ％は、前記負荷点灯回路２のばらつきの範囲Ｄ１における応答可能な最小デューティ比のうちの最大値である。第２所定値Ｘ％は、前記負荷点灯回路２のばらつきの範囲Ｄ１における応答可能な最小デューティ比のうちの最小値である。   In the vehicular lamp according to the first embodiment, the linear range may be at least the variation range D1 of the load lighting circuit 2. That is, the slope of the duty ratio change between at least the first predetermined value Y% and the second predetermined value X% of the duty ratio may be a linear expression. The first predetermined value Y% is the maximum value among the minimum duty ratios that can be responded in the variation range D1 of the load lighting circuit 2. The second predetermined value X% is the minimum value among the minimum duty ratios that can be responded in the variation range D1 of the load lighting circuit 2.

前記の直線式の範囲を、前記負荷点灯回路２のばらつきの範囲Ｄ１に所定の範囲Ｄ２を付加した範囲Ｄ３と、することにより、前記負荷点灯回路２のばらつきの範囲Ｄ１に対して余裕を持つことができ、ばらつきが大きく安価な負荷点灯回路を使用することができる。すなわち、応答可能な最小デューティ比がＹ％よりも大きいＺ％の安価な負荷点灯回路を使用することができる。なお、前記の直線の範囲Ｄ３を、図２中の二点鎖線矢印に示すように、完全消灯（０％）までの範囲に広げても良い。   By setting the linear range to a range D3 obtained by adding a predetermined range D2 to the variation range D1 of the load lighting circuit 2, there is a margin with respect to the variation range D1 of the load lighting circuit 2. Therefore, it is possible to use an inexpensive load lighting circuit having a large variation. That is, it is possible to use an inexpensive load lighting circuit whose minimum duty ratio that can be responded is Z% larger than Y%. The straight line range D3 may be expanded to a range up to complete extinction (0%) as indicated by a two-dot chain arrow in FIG.

（実施形態２の説明）
図６は、この発明にかかる車両用灯具の実施形態２を示す。図中、図１〜図５と同符号は、同一のものを示す。以下、この実施形態２における車両用灯具について説明する。 (Description of Embodiment 2)
FIG. 6 shows Embodiment 2 of the vehicular lamp according to the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 5 denote the same components. Hereinafter, the vehicular lamp in the second embodiment will be described.

前記の実施形態１における車両用灯具は、図２、図３に示すように、消灯開始時点Ｃから直線式開始時点Ｄまでの間が２次曲線式である。これに対して、この実施形態２における車両用灯具は、図６に示すように、消灯開始時点Ｃから直線式開始時点Ｄまでの間が２本の直線式である。消灯開始時点Ｃ側の直線式の傾きが直線式開始時点Ｄ側の直線式の傾きより大である。また、直線式開始時点Ｄ側の直線式の傾きが直線式開始時点Ｄからの直線式の傾きより大である。なお、消灯開始時点Ｃから直線式開始時点Ｄまでの間の直線式は、３本以上であっても良い。   As shown in FIGS. 2 and 3, the vehicular lamp according to the first embodiment has a quadratic curve formula from the turn-off start time C to the linear start time D. On the other hand, as shown in FIG. 6, the vehicular lamp according to the second embodiment has two linear types between the extinguishing start point C and the linear start point D. The linear slope at the turn-off start time point C side is larger than the linear slope at the straight line start time point D side. Further, the linear inclination on the linear expression start point D side is larger than the linear inclination from the linear expression start point D. Note that there may be three or more linear expressions between the extinction start point C and the linear start point D.

１ ＰＷＭ調光制御回路
２ 負荷点灯回路
３ 負荷 1 PWM dimming control circuit 2 Load lighting circuit 3 Load

Claims (2)

ＰＷＭ調光制御回路と、
前記ＰＷＭ調光制御回路により調光消灯する光源と、
を備え、
前記ＰＷＭ調光制御回路は、デューティ比の少なくとも第１所定値から第２所定値までの間のデューティ比変化の傾きを直線式とする、
ことを特徴とする車両用灯具。 A PWM dimming control circuit;
A light source that is dimmed and extinguished by the PWM dimming control circuit;
With
The PWM dimming control circuit uses a linear equation for the gradient of the duty ratio change between at least the first predetermined value and the second predetermined value of the duty ratio.
A vehicular lamp characterized by the above. 前記第１所定値から前記第２所定値までの範囲は、前記ＰＷＭ調光制御回路と前記光源との間に接続される負荷点灯回路のばらつきの範囲と、同等もしくはほぼ同等か、あるいは、前記ばらつきの範囲より大である、
ことを特徴とする請求項１に記載の車両用灯具。 The range from the first predetermined value to the second predetermined value is equal to or substantially equal to the range of variation of the load lighting circuit connected between the PWM dimming control circuit and the light source, or the Greater than the range of variation,
The vehicular lamp according to claim 1.
JP2013031421A 2013-02-20 2013-02-20 Vehicle lighting Active JP6263839B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2013031421A JP6263839B2 (en) 2013-02-20 2013-02-20 Vehicle lighting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2013031421A JP6263839B2 (en) 2013-02-20 2013-02-20 Vehicle lighting

Publications (2)

Publication Number Publication Date
JP2014159253A true JP2014159253A (en) 2014-09-04
JP6263839B2 JP6263839B2 (en) 2018-01-24

Family

ID=51611331

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2013031421A Active JP6263839B2 (en) 2013-02-20 2013-02-20 Vehicle lighting

Country Status (1)

Country Link
JP (1) JP6263839B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016199083A (en) * 2015-04-07 2016-12-01 株式会社小糸製作所 Lighting fixture for vehicle
CN106476679A (en) * 2015-08-27 2017-03-08 株式会社小糸制作所 Lamps apparatus for vehicle and vehicle lamp system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004235498A (en) * 2003-01-31 2004-08-19 Anden Light emitting diode controller
JP2004276656A (en) * 2003-03-13 2004-10-07 Koito Mfg Co Ltd Head light system for vehicle and light control type lighting unit for vehicle
JP2005231451A (en) * 2004-02-18 2005-09-02 Ichikoh Ind Ltd Lighting fixture for vehicle
JP2007230382A (en) * 2006-03-01 2007-09-13 Ichikoh Ind Ltd Vehicular lighting system
JP2008105636A (en) * 2006-10-27 2008-05-08 Omron Corp Illumination controlling device and method
JP2008198915A (en) * 2007-02-15 2008-08-28 Koito Mfg Co Ltd Light-emitting device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004235498A (en) * 2003-01-31 2004-08-19 Anden Light emitting diode controller
JP2004276656A (en) * 2003-03-13 2004-10-07 Koito Mfg Co Ltd Head light system for vehicle and light control type lighting unit for vehicle
JP2005231451A (en) * 2004-02-18 2005-09-02 Ichikoh Ind Ltd Lighting fixture for vehicle
JP2007230382A (en) * 2006-03-01 2007-09-13 Ichikoh Ind Ltd Vehicular lighting system
JP2008105636A (en) * 2006-10-27 2008-05-08 Omron Corp Illumination controlling device and method
JP2008198915A (en) * 2007-02-15 2008-08-28 Koito Mfg Co Ltd Light-emitting device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016199083A (en) * 2015-04-07 2016-12-01 株式会社小糸製作所 Lighting fixture for vehicle
CN106476679A (en) * 2015-08-27 2017-03-08 株式会社小糸制作所 Lamps apparatus for vehicle and vehicle lamp system
US10093222B2 (en) 2015-08-27 2018-10-09 Koito Manufacturing Co., Ltd. Vehicle lamp and vehicle lamp system
CN106476679B (en) * 2015-08-27 2019-03-26 株式会社小糸制作所 Lamps apparatus for vehicle and vehicle lamp system

Also Published As

Publication number Publication date
JP6263839B2 (en) 2018-01-24

Similar Documents

Publication Publication Date Title
CA2868837C (en) Planckian and non-planckian dimming of solid state light sources
WO2008112733A3 (en) Color variations in a dimmable lighting device with stable color temperature light sources
JP2012133995A5 (en)
JP6837777B2 (en) Lighting circuit and vehicle lighting
JP5422068B2 (en) LED lighting device and vehicle headlamp
MX2020009855A (en) Dimmable led light fixture maintaining brightness during color temperature change.
JP3173888U (en) Light emitting diode driving device and lighting equipment used by the same
JP6263839B2 (en) Vehicle lighting
KR102529870B1 (en) A lamp for vehicle
CN110087365B (en) Light Emitting Diode (LED) soft lamp strip circuit for synchronously adjusting brightness and color temperature and soft lamp strip
CN106609941B (en) Lighting device
JP2018098104A (en) Lighting device and luminaire
JP2010244801A (en) Lighting system
JP2014116354A (en) Light-emitting element drive unit, luminaire
JP6064227B2 (en) lighting equipment
CN201944632U (en) LED (Light Emitting Diode) daylight lamp
CN105578671A (en) LED lamp
CN203533263U (en) LED energy-saving lamp
KR20150034015A (en) Power control method of lamp
CN205265956U (en) Constant current LED lamps and lanterns and constant -current drive circuit thereof
CN105282899A (en) Low-flicker and high-power-factor light emitting diode drive circuit
JP2016043801A (en) Light source device and vehicular lighting fixture
CN105041183A (en) Lighting long ladder
JP2016012395A (en) Illumination device and manufacturing method thereof
JP6176482B2 (en) Beacon light

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20160212

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20161117

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20161206

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20170126

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20170704

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20170830

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20171121

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20171204

R150 Certificate of patent or registration of utility model

Ref document number: 6263839

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250