JPS62292549A - Headlight for vehicle - Google Patents
Headlight for vehicleInfo
- Publication number
- JPS62292549A JPS62292549A JP61134663A JP13466386A JPS62292549A JP S62292549 A JPS62292549 A JP S62292549A JP 61134663 A JP61134663 A JP 61134663A JP 13466386 A JP13466386 A JP 13466386A JP S62292549 A JPS62292549 A JP S62292549A
- Authority
- JP
- Japan
- Prior art keywords
- discharge lamp
- discharge
- lamp
- incandescent
- current
- 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.)
- Pending
Links
- 238000001514 detection method Methods 0.000 claims description 11
- 230000004907 flux Effects 0.000 abstract description 2
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 229910052736 halogen Inorganic materials 0.000 description 2
- 150000002367 halogens Chemical class 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910001507 metal halide Inorganic materials 0.000 description 2
- 150000005309 metal halides Chemical class 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
Landscapes
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Abstract
Description
【発明の詳細な説明】 ３、発明の詳細な説明 本発明車輌用前照灯を以下の項目に従って説明する。[Detailed description of the invention] 3. Detailed description of the invention The vehicle headlamp of the present invention will be explained according to the following items.
Ａ、産業上の利用分野
Ｂ０発明の概要
Ｃ１従来技術
り１発明が解決しようとする問題点
Ｅ１問題点を解決するための手段
Ｆ、実施例
ａ、構成
り０回路
Ｃ８動作
Ｇ９発明の効果
（Ａ、産業上の利用分野）
本発明は新規な車輌用前照灯に関する。詳しくは、放電
灯が寿命間近になって放電状態が不安定になったときに
、該放電灯への給電を停止すると共に白熱電球を点灯し
て車輌の走行に支障を来たさないようにした新規な車輌
用前照灯を提供しようとするものである。A. Industrial field of application B0 Summary of the invention C1 Prior art 1 Problems to be solved by the invention E1 Means for solving the problems F. Example a, Configuration 0 Circuit C8 Operation G9 Effects of the invention ( A. Field of Industrial Application) The present invention relates to a novel vehicle headlamp. Specifically, when a discharge lamp is nearing the end of its lifespan and the discharge state becomes unstable, the power supply to the discharge lamp is stopped and the incandescent bulb is turned on so as not to interfere with the running of the vehicle. The purpose of this invention is to provide a new vehicle headlamp with a new design.
（Ｂ、発明の概要）
本発明車輌用前照灯は、放電灯出力レベル検出手段によ
って放電灯の出力レベルを検出し、その出力レベルが一
定値以下になったとき放電灯を消灯して、寿命間近で不
安定な状態にある放電灯の光が照射されないようにする
一方、白熱電球を点灯して走行に支障を来たさないよう
にしたものである。(B. Summary of the Invention) The vehicle headlamp of the present invention detects the output level of the discharge lamp by the discharge lamp output level detection means, turns off the discharge lamp when the output level becomes below a certain value, and This prevents the discharge lamps, which are nearing the end of their lifespan and are in an unstable state, from emitting light, while allowing the incandescent bulbs to turn on so as not to interfere with driving.
（Ｃ，従来技術）
車輌、例えば、自動車において、その高速化に伴なって
より明るい前照灯が要求されている。(C, Prior Art) As vehicles, such as automobiles, move faster, brighter headlights are required.
ある種の放電灯、例えば、メタルハライドランプ等の高
圧金属蒸気放電灯は光源部が球形に近くなるため、反射
鏡やレンズによる光のコントロールを比較釣行ない易く
、自動車用前照灯の光源として使用し得るものの一つで
ある。Some types of discharge lamps, such as high-pressure metal vapor discharge lamps such as metal halide lamps, have light sources that are nearly spherical, so it is easier to control light using reflectors and lenses, and they are used as light sources for automobile headlights. This is one of the things that can be done.
ところが、放電灯は点灯を開始した初期には充分な照射
光量を得ることができない、という問題がある。However, a discharge lamp has a problem in that a sufficient amount of irradiation light cannot be obtained at the beginning of lighting.
そこで、光源として白熱電球を補助的に用い、点灯初期
の放電灯の照射光量を充分に得られないときに、白熱電
球を点灯して放電灯の光量不足を補おうという考え方が
あり、例えば、特願昭５８−６９８８号（特開昭５９−
１３４０２０号）の出願によって提案されている。Therefore, there is a concept of using an incandescent bulb as an auxiliary light source, and when the discharge lamp does not provide enough light in the initial stage of lighting, the incandescent bulb is turned on to compensate for the lack of light intensity of the discharge lamp.For example, Patent Application No. 58-6988 (Japanese Unexamined Patent Publication No. 59-
No. 134020).
（Ｄ、発明が解決しようとする問題点）ところで、放電
灯は寿命末期になると放電電圧や放電電流が変化するた
め、光束が低下し、更に程度が悪くなると、たち消えの
問題や再点灯が困難になったり、フリッカ−（点滅）を
生じ、運転者が走路前方等を視認しずらくなるばかりで
なく、対向車の運転者や歩行者に対してまぶしさや不快
感を与え、交通の安全上問題である。(D. Problem to be Solved by the Invention) By the way, when a discharge lamp reaches the end of its life, the discharge voltage and discharge current change, so the luminous flux decreases, and if the situation worsens, the problem of quick extinguishing or relighting occurs. This not only makes it difficult for the driver to see the road ahead, but also causes glare and discomfort to oncoming drivers and pedestrians, reducing traffic safety. This is a problem.
（Ｅ、問題点を解決するための手段）
本発明車輌用前照灯は上記した問題点を解決するために
、放電灯と白熱電球とを備え、放電灯の出力レベルを検
出する放電灯出力レベル検出手段により放電灯の出力レ
ベルが一定値以下になったことが検出されたとき放電灯
を消灯させると共に白熱電球を点灯させるようにしたも
のである。(E. Means for Solving the Problems) In order to solve the above-mentioned problems, the vehicle headlight of the present invention includes a discharge lamp and an incandescent lamp, and the discharge lamp output detects the output level of the discharge lamp. When the level detection means detects that the output level of the discharge lamp has become below a certain value, the discharge lamp is turned off and the incandescent lamp is turned on.
従って、本発明車輌用前照灯によれば、放電灯が寿命末
期になり、その出力レベルが一定値以下になったときは
、放電灯が消灯されるため、光束が減少した光やちらつ
きのある光の照射が防止されると共に、白熱電球が点灯
されて走行に支障がないようにされる。Therefore, according to the vehicle headlamp of the present invention, when the discharge lamp reaches the end of its life and its output level drops below a certain value, the discharge lamp is turned off. Irradiation of certain light is prevented, and the incandescent light bulb is turned on so that driving is not hindered.
（Ｆ、実施例）
以下に、本発明車輌用前照灯の詳細を図示した実施例に
従って説明する。(F. Embodiment) Details of the vehicle headlamp of the present invention will be described below according to the illustrated embodiment.
（ａ、構成） １は本発明を適用した自動車用前照灯である。(a, composition) 1 is an automobile headlamp to which the present invention is applied.
２は略箱形を為し前面に開口されたランプボディ、３は
ランプボディ２にその開口を覆うように被着されたレン
ズ、４及び５はランプボディ２内に並んで配置された反
射鏡である。Reference numeral 2 denotes a lamp body which is approximately box-shaped and has an opening at the front; 3 a lens attached to the lamp body 2 so as to cover the opening; 4 and 5 denote reflectors arranged side by side inside the lamp body 2. It is.
６は放電灯であり、前記反射鏡４内に配置されている。Reference numeral 6 denotes a discharge lamp, which is arranged within the reflecting mirror 4.
この放電灯６としては比較的高出力で光源が球形に近い
ものが良く、例えば、メタルハライドランプ等の高圧金
属蒸気放電灯が好適であるが、勿論、これに限られるも
のではない。The discharge lamp 6 preferably has a relatively high output and a nearly spherical light source, such as a high-pressure metal vapor discharge lamp such as a metal halide lamp, but is of course not limited to this.
７は白熱電球であり、前記反射鏡５内に配置されている
。この白熱電球７には、例えば、ハロゲン電球等が用い
られるが、これもハロゲン電球に限られるものではなく
、他の種類の白熱電球で構わない。Reference numeral 7 denotes an incandescent light bulb, which is disposed within the reflecting mirror 5. For example, a halogen light bulb is used as the incandescent light bulb 7, but this is not limited to a halogen light bulb, and other types of incandescent light bulbs may be used.
（ｂ、回路）
第２図は上記した前照灯１を駆動するための回路の一例
を示すものである。(b. Circuit) FIG. 2 shows an example of a circuit for driving the headlamp 1 described above.
８は制御回路であり、前記放電灯６と白熱電球７をタイ
ミング良く点灯あるいは消灯させ、又はその出力レベル
を制御するためのものであり、点灯スイッチ９を介して
直流電源１０に接続されている。A control circuit 8 is used to turn on or off the discharge lamp 6 and the incandescent lamp 7 in a timely manner, or to control their output levels, and is connected to a DC power source 10 via a lighting switch 9. .
１１は昇圧回路であり、制御回路８を介して電源１０の
電源電圧を受け、これを所定の高さまで昇圧するもので
ある。A booster circuit 11 receives the power supply voltage of the power supply 10 via the control circuit 8 and boosts the voltage to a predetermined level.
１２は昇圧回路１１の出力端子間に介挿された始動回路
であり、この始動回路１２によって高電圧パルスが形成
され放電灯６に供給される。A starting circuit 12 is inserted between the output terminals of the booster circuit 11, and a high voltage pulse is formed by this starting circuit 12 and supplied to the discharge lamp 6.
１３はスイッチング回路であり、白熱電球７の一方の端
子と制御回路８との間に介挿されており、制御回路８か
ら送出される可変パルス信号のパルス巾によるデユーテ
ィ比によって白熱電球７への供給電流を制御するもので
ある。即ち、制御回路８から送出されるパルス信号のパ
ルス巾が大ぎくなってデユーティ比が高くなれば白熱電
球７への供給電流が高くなり、また逆に、制御回路８か
ら送出されるパルス信号のパルス巾が小さくなりデユー
ティ比が低くなれば白熱電球７への供給電流が低くなる
ように制御する。A switching circuit 13 is inserted between one terminal of the incandescent light bulb 7 and the control circuit 8, and is configured to switch the incandescent light bulb 7 according to the duty ratio based on the pulse width of the variable pulse signal sent from the control circuit 8. It controls the supply current. That is, if the pulse width of the pulse signal sent out from the control circuit 8 becomes large and the duty ratio becomes high, the current supplied to the incandescent light bulb 7 becomes high, and conversely, the pulse width of the pulse signal sent out from the control circuit 8 increases. As the pulse width becomes smaller and the duty ratio becomes lower, the current supplied to the incandescent light bulb 7 is controlled to become lower.
１４は放電灯６の高圧電流の供給線に介挿された電流検
出回路であり、放電灯６の放電電流のレベルを検出し、
その結果を前記制御回路８に送出する。14 is a current detection circuit inserted in the high-voltage current supply line of the discharge lamp 6, which detects the level of the discharge current of the discharge lamp 6;
The result is sent to the control circuit 8.
そして、この制御回路８は、電流検出回路１４が検出し
た放電電流が大きいときは前記パルス信号のパルス巾が
大きくなるように、また、電流検出回路１４が検出した
放電電流が小さいときは前記パルス信号のパルス巾が小
さくなるようにする。The control circuit 8 controls the pulse width of the pulse signal to be large when the discharge current detected by the current detection circuit 14 is large, and to increase the pulse width of the pulse signal when the discharge current detected by the current detection circuit 14 is small. Make the pulse width of the signal smaller.
尚、１５は限流回路である。Note that 15 is a current limiting circuit.
１６は比較回路であり、前記電流検出回路１４で検出し
た放電灯６の放電電流をある基’Ｊ ＳＥ流と比較し、
放電電流が基準電流を越えたときに信号が前記制御回路
８に送出されるようになっている。また、この′比較回
路１５は、放電灯６の放電状態が安定した後に作動する
ようになっており、放電状態が安定するまでの間は電流
検出回路が検出した放電電流をそのまま制御回路に伝え
るようになっている。そして、上記基準電流は放電灯６
の放電状態が安定しているときの放電電流より高い値に
設定されている。16 is a comparison circuit, which compares the discharge current of the discharge lamp 6 detected by the current detection circuit 14 with a certain base 'JSE flow,
A signal is sent to the control circuit 8 when the discharge current exceeds the reference current. Further, this 'comparison circuit 15 is designed to operate after the discharge state of the discharge lamp 6 is stabilized, and until the discharge state is stabilized, the discharge current detected by the current detection circuit is directly transmitted to the control circuit. It looks like this. The above reference current is the discharge lamp 6
The discharge current is set to a higher value than the discharge current when the discharge condition is stable.
１７は表示装置であり１．前記制御回路８は比較回路１
６から信号を受けると、放電灯６への給電を停止し、白
熱電球７への給電を開始すると共に、表示装置１７を駆
動し、放電灯６が寿命末期に達したことを表示せしめる
。17 is a display device; The control circuit 8 is the comparison circuit 1
When a signal is received from the discharge lamp 6, power supply to the discharge lamp 6 is stopped, power supply to the incandescent lamp 7 is started, and the display device 17 is driven to display that the discharge lamp 6 has reached the end of its life.
（ｃ、動作）
しかして、上記前照灯１の動作について第３図及び第４
図によって説明する。(c. Operation) Therefore, the operation of the headlight 1 is shown in Figures 3 and 4.
This will be explained using figures.
第３図は放電灯６の電圧−電流特性を示すものである。FIG. 3 shows the voltage-current characteristics of the discharge lamp 6.
そして、１８は放電電圧を、また１９は放電電流を示す
。Further, 18 indicates a discharge voltage, and 19 indicates a discharge current.
点灯スイッチ９を閉成すると、昇圧回路１１を介して放
電灯６に高圧パルス電流が供給される。When the lighting switch 9 is closed, a high voltage pulse current is supplied to the discharge lamp 6 via the booster circuit 11.
そして、放電が開始するまでは端子電圧は急上昇し、電
流は流れない。放電灯６において放電が開始すると放電
電圧は低下して来る一方放電電流は上昇する。そして、
点灯初期においては放電状態が不安定であるため、放電
電流は高く、かつ、放電灯６の照射光量も少ない。そし
て、時間の経過と共に放電状態が安定して来て、放電電
流も下がって来てそれから一定になる。Then, until discharge starts, the terminal voltage rises rapidly and no current flows. When discharge starts in the discharge lamp 6, the discharge voltage decreases while the discharge current increases. and,
In the early stage of lighting, the discharge state is unstable, so the discharge current is high and the amount of light irradiated by the discharge lamp 6 is small. Then, as time passes, the discharge state becomes stable, and the discharge current also decreases and then becomes constant.
そこで、上記放電電流が高いときは制御回路８からスイ
ッチング回路１３に送出するパルス信号のパルス巾を大
きくしてデユーティ比を高くし、それによって白熱電球
７への供給電流を高くして白熱電球７の照射光量を多く
する。逆に、上記放電電流が低いときは、制御回路８か
らスイッチング回路１３に送出するパルス信号のパルス
巾を小さくしてデユーティ比を低くし、それによって白
熱電球７への供給電流を低くして白熱電球７の照射光量
を少なくする。Therefore, when the discharge current is high, the pulse width of the pulse signal sent from the control circuit 8 to the switching circuit 13 is increased to increase the duty ratio, thereby increasing the current supplied to the incandescent bulb 7. Increase the amount of light irradiated. Conversely, when the discharge current is low, the pulse width of the pulse signal sent from the control circuit 8 to the switching circuit 13 is reduced to lower the duty ratio, thereby lowering the current supplied to the incandescent bulb 7 and reducing the incandescent light bulb. Reduce the amount of light irradiated by the light bulb 7.
即ち、放電灯６の照射光量が充分でない間は白熱電球７
を点灯し、かつ、その間でも放電灯６の照射光量が増加
するに従って、白熱電球７の照射光量を減少せしめて、
前照灯１の照射光量が過度に多くならないようにしであ
る。That is, while the amount of light irradiated by the discharge lamp 6 is not sufficient, the incandescent lamp 7
is turned on, and as the amount of light irradiated by the discharge lamp 6 increases during that time, the amount of light irradiated by the incandescent bulb 7 is decreased,
This is to prevent the amount of light irradiated by the headlamp 1 from becoming excessively large.
また、第４図において、２０は比較回路１６に加えられ
ている基準電流である。そして、第４図に示すように、
放電灯６が寿命末期になると、その放電状態が乱れ、そ
れに従って、放電電流１９が一定せず、上下に変化する
。Further, in FIG. 4, 20 is a reference current applied to the comparator circuit 16. And, as shown in Figure 4,
When the discharge lamp 6 reaches the end of its life, its discharge state is disturbed, and accordingly, the discharge current 19 is not constant and changes up and down.
そこで、そのような状態になって、放電電流１９が基準
電流２０を越えると、比較回路１６から制御回路８に信
号が出力され、制御回路８において放電灯６に寿命が近
づいたことが検知される。そこで、制御回路８は放電灯
６への給電を停止すると共に、白熱電球７に給電を開始
し、これを点灯せしめる。それと同時に表示装置１８を
して放電灯６が寿命末期になったことを表示せしめる。Therefore, when such a state occurs and the discharge current 19 exceeds the reference current 20, a signal is output from the comparison circuit 16 to the control circuit 8, and the control circuit 8 detects that the discharge lamp 6 is nearing the end of its life. Ru. Therefore, the control circuit 8 stops power supply to the discharge lamp 6, and starts supplying power to the incandescent light bulb 7, causing it to light up. At the same time, the display device 18 is made to display that the discharge lamp 6 has reached the end of its life.
これによって、運転者は、放電灯６が寿命末期になった
ことを知ることができ、以後の適切な処置を行なうこと
ができる。Thereby, the driver can know that the discharge lamp 6 has reached the end of its life, and can take appropriate measures from now on.
（Ｇ、発明の効果）
以上に記載したところから明らかなように、本発明車輌
用前照灯は、放電灯と、白熱電球と、上記放電灯及び白
熱電球への電流の供給を制御する制御回路と、上記放電
灯の出力レベルを検出する放電灯出力レベル検出手段と
を備え、上記放電灯出力レベル検出手段により放電灯の
出力レベルが一定値以下になったことが検出されたとき
上記制御回路が放電灯を消灯させると共に白熱電球を点
灯させるようにしたことを特徴とする。(G. Effects of the Invention) As is clear from the above description, the vehicle headlamp of the present invention includes a discharge lamp, an incandescent lamp, and a control for controlling the supply of current to the discharge lamp and the incandescent lamp. and a discharge lamp output level detection means for detecting the output level of the discharge lamp, and the control is performed when the discharge lamp output level detection means detects that the output level of the discharge lamp has become below a certain value. It is characterized in that the circuit turns off the discharge lamp and turns on the incandescent lamp.
従って、本発明車輌用前照灯によれば、放電灯が寿命末
期になり、その出力レベルが一定値以下になったときは
、放電灯が消灯されるため、光束が減少した光やちらつ
きのある光の照射が防止されると共に、白熱電球が点灯
されて走行に支障がないようにされる。Therefore, according to the vehicle headlamp of the present invention, when the discharge lamp reaches the end of its life and its output level drops below a certain value, the discharge lamp is turned off. Irradiation of certain light is prevented, and the incandescent light bulb is turned on so that driving is not hindered.
尚、上記実施例の説明においては、放電灯と白熱電球そ
れぞれに個別の反射鏡を用意したが、反射鏡を一つ、例
えば楕円反射鏡を一つだけ用意し、その一方の焦点に放
電灯を、他方の焦点に白熱電球を配置するようにしても
良い。In the explanation of the above embodiment, separate reflectors were prepared for each of the discharge lamp and the incandescent lamp, but only one reflector, for example, one elliptical reflector, was prepared, and the discharge lamp was placed at the focal point of one of the reflectors. An incandescent light bulb may be placed at the other focal point.
図面は本発明車輌用前照灯の実ｈλの一例を示すもので
、第１図は水平断面図、第２図は回路図、第３図は放電
灯の電圧−電流特性図、第４図は動作説明図である。
符号の説明
１・・・車輌用前照灯、 ６・・・放電灯、７・・・
白熱電球、 ８・・・制御回路、１４．１６・・・放電
灯出力レベル検出手段太モ＊面図
第１図
第３図
第４図The drawings show an example of the actual hλ of the vehicle headlamp of the present invention, in which Fig. 1 is a horizontal sectional view, Fig. 2 is a circuit diagram, Fig. 3 is a voltage-current characteristic diagram of a discharge lamp, and Fig. 4 is an operation explanatory diagram. Explanation of symbols 1...Vehicle headlight, 6...Discharge lamp, 7...
Incandescent light bulb, 8...Control circuit, 14.16...Discharge lamp output level detection means Thick side view Figure 1 Figure 3 Figure 4
Claims (1)
流の供給を制御する制御回路と、上記放電灯の出力レベ
ルを検出する放電灯出力レベル検出手段とを備え、 上記放電灯出力レベル検出手段により放電灯の出力レベ
ルが一定値以下になったことが検出されたとき上記制御
回路が放電灯を消灯させると共に白熱電球を点灯させる
ようにしたことを特徴とする車輌用前照灯[Scope of Claims] A discharge lamp, an incandescent lamp, a control circuit for controlling the supply of current to the discharge lamp and the incandescent lamp, and a discharge lamp output level detection means for detecting the output level of the discharge lamp. , when the discharge lamp output level detecting means detects that the output level of the discharge lamp is below a certain value, the control circuit turns off the discharge lamp and turns on the incandescent lamp. vehicle headlights
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61134663A JPS62292549A (en) | 1986-06-10 | 1986-06-10 | Headlight for vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61134663A JPS62292549A (en) | 1986-06-10 | 1986-06-10 | Headlight for vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62292549A true JPS62292549A (en) | 1987-12-19 |
Family
ID=15133644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61134663A Pending JPS62292549A (en) | 1986-06-10 | 1986-06-10 | Headlight for vehicle |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62292549A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04129849A (en) * | 1990-09-21 | 1992-04-30 | Nissan Motor Co Ltd | Control device for vehicle headlamp |
| US6445135B2 (en) * | 1999-11-02 | 2002-09-03 | Mitsubishi Denki Kabushiki Kaisha | Electric-discharge lamp control apparatus and electric-discharge lamp control method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5679885A (en) * | 1979-11-30 | 1981-06-30 | Matsushita Electric Works Ltd | Device for firing discharge lamp |
| JPS5697996A (en) * | 1980-01-09 | 1981-08-07 | Mitsubishi Electric Corp | Device for firing high voltage disgharge lamp |
| JPS5776791A (en) * | 1980-10-30 | 1982-05-13 | Matsushita Electric Works Ltd | Light compensating device for high voltage discharge lamp |
| JPS57182997A (en) * | 1981-05-06 | 1982-11-11 | Matsushita Electric Works Ltd | Device for firing discharge lamp |
| JPS59128798A (en) * | 1983-01-13 | 1984-07-24 | 東芝ライテック株式会社 | Light compensating unit for high intensity discharge lamp |
| JPS59134020A (en) * | 1983-01-19 | 1984-08-01 | Toshiba Corp | Headlight device for vehicle |
| JPS603699B2 (en) * | 1979-04-26 | 1985-01-30 | 株式会社日立製作所 | Memory access method |
-
1986
- 1986-06-10 JP JP61134663A patent/JPS62292549A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS603699B2 (en) * | 1979-04-26 | 1985-01-30 | 株式会社日立製作所 | Memory access method |
| JPS5679885A (en) * | 1979-11-30 | 1981-06-30 | Matsushita Electric Works Ltd | Device for firing discharge lamp |
| JPS5697996A (en) * | 1980-01-09 | 1981-08-07 | Mitsubishi Electric Corp | Device for firing high voltage disgharge lamp |
| JPS5776791A (en) * | 1980-10-30 | 1982-05-13 | Matsushita Electric Works Ltd | Light compensating device for high voltage discharge lamp |
| JPS57182997A (en) * | 1981-05-06 | 1982-11-11 | Matsushita Electric Works Ltd | Device for firing discharge lamp |
| JPS59128798A (en) * | 1983-01-13 | 1984-07-24 | 東芝ライテック株式会社 | Light compensating unit for high intensity discharge lamp |
| JPS59134020A (en) * | 1983-01-19 | 1984-08-01 | Toshiba Corp | Headlight device for vehicle |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04129849A (en) * | 1990-09-21 | 1992-04-30 | Nissan Motor Co Ltd | Control device for vehicle headlamp |
| US6445135B2 (en) * | 1999-11-02 | 2002-09-03 | Mitsubishi Denki Kabushiki Kaisha | Electric-discharge lamp control apparatus and electric-discharge lamp control method |
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