JPH029296B2 - - Google Patents
Info
- Publication number
- JPH029296B2 JPH029296B2 JP18769280A JP18769280A JPH029296B2 JP H029296 B2 JPH029296 B2 JP H029296B2 JP 18769280 A JP18769280 A JP 18769280A JP 18769280 A JP18769280 A JP 18769280A JP H029296 B2 JPH029296 B2 JP H029296B2
- Authority
- JP
- Japan
- Prior art keywords
- luminous intensity
- curve
- point
- reference axis
- intensity
- 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.)
- Expired
Links
- 238000000034 method Methods 0.000 claims description 8
- 238000005286 illumination Methods 0.000 abstract 1
- 238000005259 measurement Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 5
- 239000011295 pitch Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 238000003491 array Methods 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/06—Testing the alignment of vehicle headlight devices
- G01M11/064—Testing the alignment of vehicle headlight devices by using camera or other imaging system for the light analysis
- G01M11/065—Testing the alignment of vehicle headlight devices by using camera or other imaging system for the light analysis details about the image analysis
Landscapes
- Engineering & Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は新規な自動車用前照灯等における照射
基準軸決定方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for determining an irradiation reference axis in a novel automobile headlamp or the like.
従来、自動車用前照灯の照準は前照灯試験機を
使用し配光パターンの中の最高光度点又は光度が
平衡する点と光源とを結ぶ直線を以つて所定の方
向へ指向させるべき光軸としている。 Conventionally, automobile headlights are aimed using a headlight tester, and the light that should be directed in a predetermined direction is determined by using a straight line connecting the light source and the highest luminous intensity point in the light distribution pattern or the point where the luminous intensity is balanced. It is the axis.
即ち、例えばスクリーン型前照灯試験機の場合
は光検出素子は１個だけ設けられている。従つて
このような試験機を用いて照準を行なう場合に
は、測定対象たる前照灯の前方３メートルの位置
に試験機を配置し、光検出素子を上下左右に移動
することによつてメータの振れが最大である点、
即ち、最高光度点を見い出し、該点と光源とを結
ぶ直線を以つて該前照灯の光軸としてこれを所定
の照射方向へ向ける。 That is, for example, in the case of a screen type headlamp tester, only one light detection element is provided. Therefore, when aiming using such a test device, the test device is placed 3 meters in front of the headlamp to be measured, and the meter can be adjusted by moving the light detection element up, down, left and right. The point where the swing is maximum,
That is, the point of maximum luminous intensity is found, and the straight line connecting the point and the light source is used as the optical axis of the headlamp, and is directed in a predetermined irradiation direction.
また、集光型前照灯試験機では通常光検出素子
SAは第１図Ａに示すような４分割型が用いられ
ており、各個別素子Ｓ１〜Ｓ４は第１図Ｂ，Ｃに
示すようにその起電力e1とe2，e3とe4が互いに逆
方向になるように接続されている。従つて、この
ような試験機にあつては、例えば水平方向につい
て光度分布が第２図に示すようになつている場
合、検出素子SAが位置Ａにあれば個別素子S2の
起電力e2の方が同S1の起電力e1より大、逆に位置
Ｂにあれば個別素子S1の起電力e1の方が同S2の起
電力e2より大となり、光検出素子SAを水平方向
に動かせばメータMHはこのような起電力e1とe2
との差の状態に応じた振れをする。 In addition, concentrating headlamp testers usually use a light detection element.
The SA uses a four-division type as shown in FIG. 1A, and each individual element S1 to S4 has its electromotive force e 1 and e 2 , e 3 and e 4 as shown in FIG. 1 B and C. are connected in opposite directions. Therefore, in such a test machine, if the luminous intensity distribution in the horizontal direction is as shown in Fig. 2, if the detection element SA is at position A, the electromotive force e 2 of the individual element S 2 is larger than the electromotive force e 1 of the individual element S 1 , and conversely, if it is at position B, the electromotive force e 1 of the individual element S 1 is larger than the electromotive force e 2 of the individual element S 2 , and the photodetector element SA is If you move it horizontally, the meter M H will generate such electromotive forces e 1 and e 2
It swings according to the difference between the two.
そこでこのような試験機を使用する場合は、測
定対象たる前照灯の約１メートル前に試験機を配
置し、例えばまず水平方向に光検出素子SAを移
動し、水平バランスメータMHが平衡する点を見
い出し、その位置で光検出素子を垂直方向に移動
して垂直バランスメータMVが平衡する点を見い
出し、その位置で光検出素子SAを再び水平方向
に移動して水平バランスメータMHがバランスす
る点を見い出す、というような操作を数回繰返
し、最終的に水平バランスメータMH、垂直バラ
ンスメータMVとも平衡する点を見い出して、こ
の平衡点と光源とを結ぶ直線を以つて該前照灯の
光軸とし、これを所定の照射方向へ向ける。 Therefore, when using such a tester, place the tester approximately 1 meter in front of the headlamp to be measured, and, for example, first move the photodetector element SA in the horizontal direction so that the horizontal balance meter M H is balanced. At that position, move the photodetecting element vertically to find the point where the vertical balance meter M V is balanced, and at that position move the photodetecting element SA again horizontally to set the horizontal balance meter M H Repeat this process several times to find a point where both horizontal balance meter M H and vertical balance meter MV are balanced, and then draw a straight line connecting this equilibrium point and the light source. The optical axis of the headlamp is set as the optical axis, and it is directed in a predetermined irradiation direction.
ところで、実際我々がこの方法で照準を施した
自動車を夜間運転して見ると、ビームが正しく前
方を指向していないような感じを受けることがあ
る。 By the way, when we actually drive a car at night with this method of aiming, we sometimes get the feeling that the beam is not pointing correctly ahead.
本願発明者らはこの点につき原因を探究したと
ころ、次のような問題点を発見した。 The inventors of the present invention investigated the cause of this problem and discovered the following problem.
即ち、市中に出回つている自動車前照灯はJIS
−Ｄ−5500等により配光パターンが細かく規制さ
れてはいるが、このような規格を満足しているも
のであつても、その配光パターンの中央部の詳細
な光度分布にはかなりバラツキがある。第３図は
このような中央部の詳細な光度分布の一例を示
し、同図Ａは等高度曲線が全体に同心状に描か
れ、その中心に最高光度点Ｍが位置する例、同図
Ｂは等光度曲線が同心状にならず、最高光度点Ｍ
がいずれかの方向へ偏つている例、同図Ｃは中央
部分が平坦で最高光度点が不明確な例、同図Ｄは
最高光度点Ｍが複数存在する例である。 In other words, the car headlights on the market are JIS.
-D-5500 etc., the light distribution pattern is regulated in detail, but even if it satisfies such standards, there is considerable variation in the detailed luminous intensity distribution in the center of the light distribution pattern. be. Figure 3 shows an example of such a detailed luminous intensity distribution in the central area. The isophotonic curves are not concentric, and the maximum luminous intensity point M
is biased in either direction, C in the same figure is an example in which the central portion is flat and the highest luminous intensity point is unclear, and D in the same figure is an example in which there are a plurality of highest luminous intensity points M.
また、規格を満足していても例えばJIS−Ｄ−
5500によれば最高光度は２万カンデラ以上４万カ
ンデラ以下と幅があり、パターンの各点における
光度も各製品によつてかなりの差異がある。 Also, even if the standard is satisfied, for example, JIS-D-
According to the 5500, the maximum luminous intensity varies from 20,000 candela to 40,000 candela, and the luminous intensity at each point of the pattern also varies considerably depending on the product.
そして、発明者らがこのような様々な等光度曲
線を有する前照灯について従来の最高光度点を基
準とする照準方法で照準をし、視認をして見た結
果、第３図Ａのように最高光度点Ｍが同心状の等
光度曲線をもつものについては正しくビームが指
向されていると感ずるがそれ以外のものについて
は、人により、かなりビームがずれていると感ず
ることが判つた。 The inventors aimed the headlights with such various isolight curves using the conventional aiming method based on the maximum luminous intensity point and visually confirmed the results, as shown in Figure 3A. It has been found that when the maximum luminous intensity point M has a concentric isoluminous curve, people feel that the beam is correctly directed, but for other cases, some people feel that the beam is considerably deviated.
このような結果から、人によつてかなり差はあ
るけれども、前照灯によつて明かるく照らし出さ
れていると感ずる範囲はある等光度曲線によつて
囲まれた範囲、例えば最高光度の80％の等光度曲
線によつて囲まれた範囲であり、最高光度点Ｍを
以つて明かるく照らし出される範囲の基準として
は見ていないものであつて、最高光度点Ｍを基準
とする従来の照準方法は必らずしも実際に即しな
いものであることが明らかになつた。 These results show that although there are considerable differences depending on the person, the area that feels brightly illuminated by headlights is the area surrounded by a certain isolight curve, for example, the area surrounded by the maximum luminous intensity of 80 % isophotonic curve, and is not considered as a standard for the range that is brightly illuminated at the maximum luminous intensity point M. It became clear that the aiming method was not always practical.
本発明はこのような点に鑑みて為されたもので
あり、自動車用前照灯等における照準基準軸を決
定する場合において、配光パターンの中から最高
光度に対し所定の割合の光度を有する点の集合か
ら成る等光度曲線を求め、更に該等光度曲線に外
接する水平方向に延びる二辺と垂直方向に延びる
二辺とから成る方形の領域を求め、該方形領域の
中心点と光源とを結ぶ直線を以つてその自動車用
前照灯等における照射基準軸とすることを特徴と
する。 The present invention has been made in view of the above points, and when determining the aiming reference axis of an automobile headlamp, etc., the present invention has a luminous intensity of a predetermined ratio to the highest luminous intensity among the light distribution patterns. Find an isolight curve consisting of a set of points, then find a rectangular area consisting of two sides extending in the horizontal direction and two sides extending in the vertical direction circumscribed to the isolight curve, and calculate the center point of the rectangular area and the light source. A straight line connecting the two is used as the irradiation reference axis for the automobile headlamp, etc.
以下、本発明の詳細を所謂マイクロコンピユー
タを組み込んだ装置を使用して実施する場合を例
にとつて説明する。 The details of the present invention will be described below, taking as an example the case where the present invention is implemented using a device incorporating a so-called microcomputer.
まず、配光パターンの各点の光度のデータサン
プリングは次のようにして行なう。即ち、第４図
に示すように光検出素子LSを縦にｍ個配列する。
そしてこれら光検出素子列LSAを左から右へ所
定ピツチづつｎピツチ移動させ、各ピツチごとに
各検出素子LS1〜LSnの起電力を測定する。 First, data sampling of the luminous intensity at each point of the light distribution pattern is performed as follows. That is, as shown in FIG. 4, m photodetecting elements LS are arranged vertically.
Then, these photodetecting element arrays LSA are moved from left to right by a predetermined pitch of n pitches, and the electromotive force of each of the detection elements LS 1 to LS n is measured for each pitch.
これにより、光検出素子列LSAの移動によつ
て形成されるところの仮想スクリーーンISC上に
おける配光パターンの各点の光度が測定される。 Thereby, the luminous intensity at each point of the light distribution pattern on the virtual screen ISC, which is formed by the movement of the photodetector array LSA, is measured.
なお、本実施例の場合は第５図に示すように集
光レンズＬを使用し、10ｍ先のスクリーンSC１
０に映し出される配光パターンを前記仮想スクリ
ーンISC上に相似縮少して投映するようにしてい
る。 In the case of this embodiment, a condenser lens L is used as shown in Fig. 5, and the screen SC1 located 10 meters away is
The light distribution pattern projected at 0 is similarly reduced and projected onto the virtual screen ISC.
次に第６図は本発明を実施するための装置のブ
ロツク構成を示す。 Next, FIG. 6 shows a block configuration of an apparatus for carrying out the present invention.
図中、HLは被測定対象たる自動車用前照灯、
Ｌは前述の集光レンズ、LSAは前述の光検出素
子列である。SCNは走査スイツチで各光検出素
子LS1〜LSnの起電力を順次検出するために使用
する。DCAは光検出素子LS1〜LSnの起電力を増
幅するための直流増幅器、Ａ−Ｄはアナログデジ
タル変換器で直流増幅器DCAの出力電圧を符号
化する。DRVは光検出素子例LSAを水平方向に
移動させるための駆動部、SSWは装置を起動す
るためのスイツチである。そしてこれらアナログ
デジタル変換器、駆動部DRV、スタートスイツ
チSSWは入出力回路Ｉ／Ｏを介して中央処理装
置CPUに接続されている。また、MEMは記憶回
路であり、処理を行なうためのプログラムや光検
出素子列LSAによつて得えられたデータが書き
込まれる。そしてまた、DPは表示器であり、ラ
ンプ軸に対する照射基準軸の偏向方向を表示す
る。 In the figure, HL is the automobile headlamp that is the object to be measured.
L is the aforementioned condensing lens, and LSA is the aforementioned photodetector array. SCN is used to sequentially detect the electromotive force of each photodetector element LS 1 to LS n with a scanning switch. DCA is a DC amplifier for amplifying the electromotive force of the photodetecting elements LS 1 to LS n , and AD is an analog-to-digital converter that encodes the output voltage of the DC amplifier DCA. DRV is a drive unit for horizontally moving the photodetector element LSA, and SSW is a switch for starting the device. The analog-to-digital converter, drive unit DRV, and start switch SSW are connected to the central processing unit CPU via an input/output circuit I/O. Further, the MEM is a storage circuit, into which programs for processing and data obtained by the photodetector array LSA are written. Furthermore, DP is an indicator that displays the deflection direction of the irradiation reference axis with respect to the lamp axis.
而して、このような装置を使用して本発明は次
のようにして実施される。 Using such a device, the present invention is carried out as follows.
先ず、被測定対象たる自動車用前照灯HLをそ
のランプ軸LL（JIS−Ｄ−5500・付図１備考参照）
が集光レンズの中心L0を通るように装置に正対
させ点灯しておく。そしてスタートスイツチ
SSWを押すとプログラムに従つてデータ収集が
開始される。即ち、駆動部DRVにより光検出素
子列LSAが第４図において左から右へと移動を
開始し、１ピツチづつ右へ進んだ所で走査スイツ
チSCNが走査され、上下に配列された光検出素
子LS1〜LSnの各データが記憶回路MEMに蓄積
される。そしてこのような操作が右端の位置ｎの
ところまで順次進められ、前述のように配光パタ
ーンの各点における光量が記憶回路MEMの所定
の各番地に蓄積される。 First, the vehicle headlamp HL, which is the object to be measured, is connected to its lamp axis LL (JIS-D-5500, see attached figure 1 notes).
Directly face the device so that the light passes through the center L0 of the condenser lens, and turn on the light. and start switch
Press SSW to start data collection according to the program. That is, the photodetecting element array LSA starts moving from left to right in FIG. 4 by the drive unit DRV, and when it moves one pitch at a time to the right, the scanning switch SCN is scanned, and the photodetecting elements arrayed vertically are scanned. Each data of LS 1 to LS n is accumulated in the memory circuit MEM. Then, such operations are sequentially performed up to the rightmost position n, and as described above, the amount of light at each point of the light distribution pattern is accumulated at each predetermined address of the memory circuit MEM.
次に、この等光度曲線Ｎに外接する方形の領域
が決定される。即ち、第８図は記憶回路MEMに
蓄積された等光度曲線の状態をモデル化して表わ
したものである。第８図において等光度曲線の水
平方向の左端の番地は９行３列目の番地、右端の
番地は９行17列目の番地であり、また、垂直方向
についての上端の番地は３行10列目の番地、下端
の番地は13行９列目の番地である。 Next, a rectangular region circumscribing this isophotometric curve N is determined. That is, FIG. 8 is a modeled representation of the state of the isophotonic curves stored in the memory circuit MEM. In Figure 8, the left end address in the horizontal direction of the isophotonic curve is the address in the 9th row and 3rd column, the right end address is the 9th row and 17th column address, and the upper end address in the vertical direction is the 3rd row and 10th address. The address of the 13th column and the lower end is the address of the 9th column of the 13th row.
従つて、３行３列目の番地、３行17列目の番
地、13行３列目の番地、13行17列目の番地に囲ま
れた領域が最高光度に対し所定の割合の光度を有
する点の集合から成る等光度曲線Ｎに外接する方
形領域SARとなる。 Therefore, the area surrounded by the address of the 3rd row and 3rd column, the address of the 3rd row and 17th column, the address of the 13th row and 3rd column, and the address of the 13th row and 17th column has a luminous intensity of a predetermined ratio to the maximum luminous intensity. This is a rectangular area SAR circumscribed to an isophotic curve N consisting of a set of points having
そして、これらデータの中から、先ず最高光度
の点Ｍ（第７図）が決定される。その方法はいく
つか考えられるが、本実施例では、まず記憶回路
MEMのデータの最初のものと２番目のものとを
比較し、大きい方を残す。次に該残されたデータ
と３番目のデータを比較して、また、大きい方の
データを残す。 Then, from among these data, first, the point M (FIG. 7) with the highest luminous intensity is determined. There are several ways to do this, but in this example, we will first use the memory circuit.
Compare the first and second MEM data and keep the larger one. Next, the remaining data is compared with the third data, and the larger data is left.
このような操作を最後のデータまで繰り返すこ
とにより、先ず実際の最高光度の点Ｍの光度が見
い出される。 By repeating this operation until the last data, the actual luminous intensity of the point M of the highest luminous intensity is found.
次に該最高光度に所定の割合を掛けた光度が決
定される。例えば、前述の最高光度点Ｍの光度が
３万カンデラ、所定の割合が80％とすれば、
24000カンデラが求める所定の割合の光度である。 The luminous intensity is then determined by multiplying the maximum luminous intensity by a predetermined percentage. For example, if the luminous intensity at the maximum luminous intensity point M mentioned above is 30,000 candela and the predetermined ratio is 80%, then
24,000 candela is the required luminous intensity.
そして、この光度24000カンデラに等しい点が
探し出され、第７図における等光度曲線Ｎが求め
られる。 Then, a point equal to this luminous intensity of 24,000 candela is found, and the isoluminous curve N in FIG. 7 is determined.
そして、この方形領域SARの中心点は水平方
向については３列目と17列目の中間の10列目の上
に、また、垂直方向については３行目と13行目の
中間の８行目の上にあるから、その交点８行10列
目の番地がこの方形領域の中心点となり、これが
第７図における方形領域SARの中心点Ｃに該当
し、該点Ｃと光源とを結ぶ直線BLが被測定対象
たる前照灯HLの照射基準軸となり、本発明によ
る場合この照射基準軸BLを所定の方向へ向ける。 The center point of this rectangular area SAR is located above the 10th column between the 3rd and 17th columns in the horizontal direction, and on the 8th row between the 3rd and 13th rows in the vertical direction. Since the address of the 8th row and 10th column of the intersection is the center point of this rectangular area, this corresponds to the center point C of the rectangular area SAR in Fig. 7, and the straight line BL connecting the point C and the light source is is the irradiation reference axis of the headlamp HL, which is the object to be measured, and in accordance with the present invention, this irradiation reference axis BL is directed in a predetermined direction.
なお、これらデータは中央処理装置CPUで処
理され、照射基準軸BLの方向は、ランプ軸LLを
基準として「水平方向、左へ〇〇度」「垂直方向、
下へ〇〇度」というような形で表示装置DPに表
示される。 These data are processed by the central processing unit CPU, and the direction of the irradiation reference axis BL is ``horizontal direction, 〇〇 degrees to the left'', ``vertical direction,
It is displayed on the display device DP in the form of ``Down 〇〇 degrees''.
以上説明したように本発明自動車用前照灯等に
おける照射基準軸決定方法では、配光パターンの
中から最高光度に対し所定の割合の光度を有する
点の集合から成る等光度曲線を求め、更に該等光
度曲線に外接する水平方向に延びる二辺と垂直方
向に延びる二辺とから成る方形の領域を求め、該
方形領域の中心点と光源とを結ぶ直線を以つてそ
の自動車用前照灯等における照射方向に指向させ
るべき照射基準軸とすることとしている。 As explained above, in the method for determining the irradiation reference axis for automobile headlamps, etc. of the present invention, an isoluminous curve consisting of a set of points having luminous intensity at a predetermined ratio to the maximum luminous intensity is determined from the light distribution pattern, and Find a rectangular area consisting of two horizontally extending sides and two vertically extending sides that circumscribe the isophotometric curve, and use a straight line connecting the center point of the rectangular area and the light source to determine the shape of the automobile headlamp. The irradiation reference axis should be oriented in the irradiation direction in etc.
従つて、配光パターンの中央付近においてその
詳細な光度分布が対称的でない、即ち、最高光度
点がいずれの方向に偏つていたり最高光度点の位
置が明確でなくても、本発明によれば、より適切
な照準を施すことが可能となる。 Therefore, even if the detailed luminous intensity distribution near the center of the light distribution pattern is not symmetrical, that is, the maximum luminous intensity point is biased in any direction or the position of the maximum luminous intensity point is not clear, the present invention can be applied. This allows for more appropriate aiming.
また、本発明によれば出射される総光量が異る
全ての灯具についてより適確な照準を施すことが
できる。 Furthermore, according to the present invention, it is possible to more accurately aim all the lamps that emit different amounts of light in total.
なお、最高光度に対する割合を何パーセントに
するかは被測定対象たる自動車用前照灯等の特
性、特に配光パターンの中央付近における詳細な
光度分布に前述のようにいろいろな形があるがた
め、一概には云えないが、50％から90％ぐらいの
範囲で定めるのが適切であると考えられる。 The percentage of the maximum luminous intensity depends on the characteristics of the vehicle headlights to be measured, especially since the detailed luminous intensity distribution near the center of the light distribution pattern has various shapes as mentioned above. Although it cannot be said with certainty, it is considered appropriate to set it in the range of about 50% to 90%.
また、本実施例は自動車用前照灯についてのも
のであるが、その出射光に指向性のある他のすべ
ての灯具、例えば航空機用、船舶用、鉄道車輛用
等に用いられる灯具、サーチライトその他の灯具
の場合にも本発明を適用しうるものである。 Furthermore, although this embodiment concerns automobile headlights, it can also be applied to all other lighting devices whose emitted light is directional, such as lighting devices used for aircraft, ships, railway vehicles, etc., and searchlights. The present invention can also be applied to other lamps.
第１図は従来の前照灯試験機に使用されている
４分割型光検出素子の概略を示し、同図Ａは正面
図、同図Ｂ，Ｃは結線図、第２図は４分割型光検
出素子の働きを自動車用前照灯配光の水平方向に
おける光度分布との関係で説明するための図、第
３図は配光パターンの中央部における詳細な光度
分布の各例を示す説明図、第４図は本発明を実施
するために使用する光検出素子列及びその水平方
向の移動により形成される仮想スクリーンを表わ
した正面図、第５図は集光レンズを用いて10ｍ先
のスクリーンに描かれる配光パターンを近距離に
おいて相似縮少させる場合の手法を示す説明図、
第６図は本発明を実施するための装置の一例を示
すブロツク図、第７図は本発明における等光度曲
線、方形領域等を示す説明図、第８図は記憶回路
に蓄積されたデータの状態を示すモデル図であ
る。
符号の説明、HL……自動車用前照灯等、BL…
…照射基準軸、Ｎ……等光度曲線、SAR……方
形領域、Ｃ……方形領域の中心点。
Figure 1 shows an outline of a 4-split type photodetector element used in a conventional headlamp tester. Figure A is a front view, Figures B and C are wiring diagrams, and Figure 2 is a 4-split type photodetector element. A diagram for explaining the function of the photodetecting element in relation to the horizontal luminous intensity distribution of the automobile headlamp light distribution, and FIG. 3 is an explanation showing detailed examples of the luminous intensity distribution in the central part of the light distribution pattern. Figure 4 is a front view showing a virtual screen formed by the photodetector array used to carry out the present invention and its horizontal movement, and Figure 5 is a front view showing a virtual screen formed by the photodetector array used to carry out the present invention and its horizontal movement. An explanatory diagram showing a method for reducing similarity of light distribution patterns drawn on a screen at a short distance,
FIG. 6 is a block diagram showing an example of a device for carrying out the present invention, FIG. 7 is an explanatory diagram showing isophotonic curves, rectangular areas, etc. in the present invention, and FIG. 8 is a diagram of data stored in the memory circuit. It is a model diagram showing the state. Explanation of codes, HL...Car headlights, etc., BL...
...Irradiation reference axis, N...isophotonic curve, SAR...square area, C...center point of the square area.
Claims (1)
する場合において、配光パターンの中から最高光
度に対し所定の割合の光度を有する点の集合から
成る等光度曲線を求め、更に該等光度曲線に外接
する水平方向に延びる二辺と垂直方向に延びる二
辺とから成る方形の領域を求め、該方形領域の中
心点と光源とを結ぶ直線を以つてその自動車用前
照灯等における照射基準軸とすることを特徴とす
る自動車用前照灯等における照射基準軸決定方
法。1. When determining the reference axis of irradiation for automobile headlamps, etc., an isolight curve consisting of a set of points having a luminous intensity of a predetermined ratio to the maximum luminous intensity is determined from the light distribution pattern, and then the isolight curve is Find a rectangular area consisting of two sides extending in the horizontal direction and two sides extending in the vertical direction that circumscribe the area, and use a straight line connecting the center point of the rectangular area and the light source to determine the irradiation standard for the automobile headlamp, etc. A method for determining an irradiation reference axis for automobile headlights, etc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18769280A JPS57111430A (en) | 1980-12-29 | 1980-12-29 | Deciding method of irradiation reference axis for automobile front lamp or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18769280A JPS57111430A (en) | 1980-12-29 | 1980-12-29 | Deciding method of irradiation reference axis for automobile front lamp or the like |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57111430A JPS57111430A (en) | 1982-07-10 |
| JPH029296B2 true JPH029296B2 (en) | 1990-03-01 |
Family
ID=16210471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18769280A Granted JPS57111430A (en) | 1980-12-29 | 1980-12-29 | Deciding method of irradiation reference axis for automobile front lamp or the like |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57111430A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03123091U (en) * | 1990-03-27 | 1991-12-16 |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6021675A (en) * | 1983-07-18 | 1985-02-04 | Toyota Motor Corp | Method and apparatus of automatic correction of position shift of television camera in measuring device |
| US4647195A (en) * | 1984-07-17 | 1987-03-03 | Toyota Jidosha Kabushiki Kaisha | Automotive headlamp testing method and apparatus |
| JPH0656352B2 (en) * | 1987-11-17 | 1994-07-27 | 安全自動車株式会社 | Detecting device |
-
1980
- 1980-12-29 JP JP18769280A patent/JPS57111430A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03123091U (en) * | 1990-03-27 | 1991-12-16 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57111430A (en) | 1982-07-10 |
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