JPS639921Y2 - - Google Patents

Description

【考案の詳細な説明】 技術分野 本考案は新規な車輌用灯具に関し、光源からの
光をレンズ面上に均一に投射してレンズ面におけ
る光度を均一にし、良好な配光が得られ、しかも
意匠的効果も増大する新規な車輌用灯具を提供し
ようとするものである。[Detailed Description of the Invention] Technical Field The present invention relates to a novel vehicular lamp, which uniformly projects light from a light source onto a lens surface, makes the luminous intensity on the lens surface uniform, and provides good light distribution. The present invention aims to provide a novel vehicular lamp that also increases the design effect.

従来技術及び問題点 車輌用灯具、例えば自動車の前照灯において、
従来一般に、反射鏡とその前面を覆うレンズで構
成される灯室内に光源を置き、この光源からの光
をレンズに投射してここで必要な屈折拡散等を行
ない、指向性を与えて所定の配光を得るものであ
るが、そのレンズに対して光源から投射される光
は、レンズ面に均等に投射されておらず、レンズ
面の光度は均一になつてはいない。これについて
詳細に説明すると、第１図は従来の車輌用灯具を
示し、ａは放物面鏡をなす反射鏡、ｂはその反射
鏡ａの放物面の軸ｃ上の焦点位置に配置された光
源であり、ｄは反射鏡前方を覆うように設けられ
たレンズである。このような灯具において、光源
ｂから出た光の一部は反射鏡ａにおける反射を介
することなく直射光ｅとして前方のレンズｄに投
射され、又他の一部は反射鏡ａで反射された反射
光ｆとして前方のレンズｄに投射される。又該反
射光ｆの光束密度は反射鏡ａの低頂部ｇつまり放
物面軸ｃ付近において最も密度が高く、周辺に向
うに従つて密度が低くなる。すなわち、レンズｄ
を正面から見たとき、レンズの中心部ｈにおいて
は光源ｂからの直射光ｅと光束密度の高い反射光
ｆが投射され、レンズの周辺部においては光束密
度の低い反射光ｆのみが投射され、これによつて
レンズｄ面における光度の分布はレンズ中央部で
局部的に高く、周辺部では著るしく低くなつてし
まい均一な光度が得られない。従つて、所望の配
光を得ようとする場合、レンズｄに果される負荷
が大きくなるという問題があるし、仮にレンズｄ
の設計にかなりの無理をしても良好な配光が得ら
れないという問題がある。又、このように局部的
に光度が高い灯具を自動車に用いると、対向車等
に与える眩惑が著るしく交通の安全を妨げる原因
となる。一方、このような光度ムラを解決するた
めにレンズを二重構造としてその局部的明るさを
補正する手段もあるが、構成が複雑なわりに大し
た効果は得られない。Prior Art and Problems In vehicle lighting equipment, for example, automobile headlights,
Conventionally, in general, a light source is placed in a lamp chamber consisting of a reflector and a lens covering the front surface of the light source, and the light from this light source is projected onto the lens, where necessary refraction and diffusion are performed to give it directivity and produce a desired light. Although light distribution is obtained, the light projected from the light source onto the lens is not evenly projected onto the lens surface, and the luminous intensity on the lens surface is not uniform. To explain this in detail, Fig. 1 shows a conventional vehicle lamp, in which a is a reflecting mirror that is a parabolic mirror, and b is a focal point located on the axis c of the paraboloid of the reflecting mirror a. d is a lens provided to cover the front of the reflecting mirror. In such a lamp, a part of the light emitted from the light source b is projected onto the front lens d as direct light e without being reflected by the reflector a, and the other part is reflected by the reflector a. The reflected light f is projected onto the front lens d. The luminous flux density of the reflected light f is highest near the low top g of the reflecting mirror a, that is, near the parabolic axis c, and becomes lower toward the periphery. That is, lens d
When viewed from the front, direct light e from light source b and reflected light f with high luminous flux density are projected at the center h of the lens, and only reflected light f with low luminous flux density is projected at the periphery of the lens. As a result, the distribution of luminous intensity on the d-plane of the lens is locally high at the center of the lens and significantly lower at the periphery, making it impossible to obtain uniform luminous intensity. Therefore, when trying to obtain a desired light distribution, there is a problem that the load exerted on the lens d increases, and if the lens d
There is a problem in that good light distribution cannot be obtained even if a considerable amount of effort is put into the design. Furthermore, if such a lamp with locally high luminous intensity is used in a car, it will dazzle oncoming cars and the like, causing a serious hindrance to traffic safety. On the other hand, in order to solve such unevenness in brightness, there is a method of correcting the local brightness by using a double structure of the lens, but this method is complicated and does not produce much effect.

問題点を解決するための手段 そこで本考案は、レンズに投射される光源から
の光を略反射光のみとして、レンズ面における光
度の分布をできるだけ均一にし、良好な配光がえ
られるようにし、その上意匠的効果も増大する新
規な車輌用灯具を提供しようとするもので、灯室
の両側部に反灯室側に突出した凹部を形成し、該
凹部内にそれぞれ焦点を有する回転放物面鏡を少
なくとも一対設けて反射鏡を構成し、該各回転放
物面鏡の略焦点位置に光源を配置し、反射鏡の前
面開口部をレンズにて覆つたことを特徴とする。Means to Solve the Problems Therefore, the present invention aims to make the light intensity distribution on the lens surface as uniform as possible by reducing the light from the light source projected onto the lens to almost only reflected light, so that a good light distribution can be obtained. In addition, the object is to provide a new vehicular lamp that increases the design effect, in which recesses are formed on both sides of the light chamber that protrude toward the opposite side of the light chamber, and a paraboloid of revolution having a focal point in each recess is provided. The present invention is characterized in that at least one pair of surface mirrors is provided to constitute a reflecting mirror, a light source is placed approximately at the focal point of each parabolic mirror of revolution, and a front opening of the reflecting mirror is covered with a lens.

考案の説明 以下に本考案車輌用灯具の詳細を添付図面に示
した実施例に従つて説明する。DESCRIPTION OF THE INVENTION The details of the vehicle lamp of the present invention will be explained below with reference to the embodiments shown in the accompanying drawings.

考案の原理 尚、説明の便宜上、本考案車輌用灯具に用いる
反射鏡の構造原理を最初に述べる。Principle of the Invention For convenience of explanation, the structural principle of the reflector used in the vehicle lamp of the present invention will be described first.

第２図は本考案車輌用灯具に用いる反射鏡の構
造原理を示すものである。既知のとおり放物線は
軸１の左右が対象である一対の放物曲線２，２か
らなり、この左右いずれか一方の放物曲線を該軸
１を回転軸として360゜回転すれば該軸１上に光学
的焦点３をもつ略腕状の回転放物面４が得られ、
この内面に光を反射する反射面を形成すれば該軸
１を光軸とする所謂回転放物面鏡が得られる。そ
して、この回転放物面鏡を、該光軸１を通る平面
で２分割すれば、一側に該回転放物面鏡の光軸１
及び底頂部５を有し他側に該回転放物面鏡の円周
開口縁部６を有する半回転放物面鏡（以下、単に
「半回転放物面鏡」と称する）７が得られる。従
つて、この半回転放物面鏡７はその鏡面のいずれ
の部分をとつてみても、焦点３との焦点関係を維
持する限り、該焦点から出射する光は上記光軸１
と平行な反射光として反射する。本考案車輌用灯
具は、このようにして得られる半回転放物面鏡を
反射鏡として用いるものである。 FIG. 2 shows the structural principle of a reflector used in the vehicle lamp of the present invention. As is known, a parabola consists of a pair of parabolic curves 2 and 2, which are symmetrical on the left and right sides of axis 1.If one of the left and right parabolic curves is rotated 360° with axis 1 as the rotation axis, it will be on axis 1. A substantially arm-shaped paraboloid of revolution 4 having an optical focus 3 is obtained,
By forming a reflective surface that reflects light on this inner surface, a so-called parabolic mirror of revolution having the axis 1 as the optical axis can be obtained. If this parabolic mirror of revolution is divided into two by a plane passing through the optical axis 1, one side will have the optical axis 1 of the parabolic mirror of revolution.
A half-rotation paraboloid mirror (hereinafter simply referred to as "half-rotation paraboloid mirror") 7 having a bottom apex 5 and a circumferential opening edge 6 of the paraboloid of revolution on the other side is obtained. . Therefore, no matter which part of the mirror surface of the semi-rotating parabolic mirror 7 is taken, as long as the focal relationship with the focal point 3 is maintained, the light emitted from the focal point will follow the optical axis 1.
It is reflected as reflected light parallel to the . The vehicle lamp of the present invention uses the thus obtained semi-rotated parabolic mirror as a reflecting mirror.

実施例 第３図は、本考案車輌用灯具の実施例８を示す
ものである。図中９及び１０はそれぞれ上記した
のと同様の半回転放物面鏡であり、その放物面の
各光軸１１及び１２は灯室１３の両側面部１４及
び１５に形成されたバルブ収納凹部２８及び２９
内を通つており、従つてその光学的焦点も前記バ
ルブ収納凹部２８及び２９内に位置する。そして
各半回転放物面鏡９及び１０のそれぞれの円周開
口縁１６，１７は灯室の中央において稜線１８を
形成する毎くに接合され、又各回転放物面鏡９及
び１０のそれぞれの底頂部１９，２０は灯室１３
の両側面部１４及び１５の最奥部に位置し、こう
して該灯室１３を略左右に２分する如き反射鏡２
１が形成される。２２は、該反射鏡２１の前面開
口を覆うように配置されたレンズで、その内面に
は所定の屈折拡散作用を行なうレンズステツプ２
３，２３……が形成されている。２４及び２５は
半回転放物面鏡９及び１０の各焦点位置にフイラ
メント２６，２７が位置するように配置された白
熱電球等の光源であり、灯室１３の両側面部１４
及び１５に形成されたバルブ収納凹部２８，２９
内に収納されている。Embodiment FIG. 3 shows an eighth embodiment of the vehicle lamp of the present invention. In the figure, reference numerals 9 and 10 indicate half-rotation parabolic mirrors similar to those described above, and the optical axes 11 and 12 of the paraboloids are located in bulb storage recesses formed in both side surfaces 14 and 15 of the lamp chamber 13. 28 and 29
The optical focus is therefore also located within the bulb receiving recesses 28 and 29. The respective circumferential opening edges 16 and 17 of each half-rotation paraboloid mirror 9 and 10 are joined to form a ridge line 18 at the center of the lamp chamber, and the respective circumferential opening edges 16 and 17 of each half-rotation paraboloid mirror 9 and 10 are The bottom top parts 19 and 20 are the light chamber 13
A reflecting mirror 2 is located at the innermost part of both side surfaces 14 and 15 of the lamp, and thus divides the lamp chamber 13 approximately into left and right halves.
1 is formed. Reference numeral 22 denotes a lens disposed to cover the front opening of the reflecting mirror 21, and a lens step 2 for performing a predetermined refraction and diffusion effect is provided on the inner surface of the lens.
3, 23... are formed. Reference numerals 24 and 25 indicate light sources such as incandescent light bulbs, which are arranged such that filaments 26 and 27 are located at the focal positions of the semi-rotating parabolic mirrors 9 and 10, respectively.
and valve housing recesses 28 and 29 formed in 15.
It is stored inside.

上記した本考案に係る車輌用灯具８において
は、灯具の灯室両側部に反灯室側に突出した凹部
を形成し、該凹部内にそれぞれ光学的焦点をもつ
半回転放物面鏡９，１０を左右一対設けて反射鏡
２１を形成し、その各焦点位置に光源を配置した
ものであるから、各光源２４及び２５から出た光
は、直射光としてレンズ２２面に垂直に即ち反射
鏡２１の光軸１１又は１２と平行に投射されるこ
とが全く無く、レンズ２２面に垂直に投射される
光は、全て一且反射鏡２１によつて反射された反
射光のみとなる。従つて、レンズ２２面において
は光源２４及び２５からの直射光が局部的に集中
することがなく、レンズ２２面における光度の分
布はほぼ均一となる。 In the above-mentioned vehicle lamp 8 according to the present invention, a concave portion is formed on both sides of the light chamber of the lamp, protruding toward the opposite side of the light chamber, and a semi-rotated parabolic mirror 9, each having an optical focus inside the concave portion, is provided. 10 are provided as a pair on the left and right to form a reflecting mirror 21, and a light source is placed at each focal point of the reflecting mirror 21. Therefore, the light emitted from each light source 24 and 25 is directed perpendicularly to the surface of the lens 22, that is, the reflecting mirror 21. There is no light projected parallel to the optical axis 11 or 12 of the lens 21, and all the light projected perpendicularly to the surface of the lens 22 is only the reflected light reflected by the reflecting mirror 21. Therefore, the direct light from the light sources 24 and 25 is not locally concentrated on the surface of the lens 22, and the distribution of luminous intensity on the surface of the lens 22 is approximately uniform.

上記のようにして、レンズ２２面に対してほぼ
均一に投射された光源２４及び２５からの反射光
束は、該レンズ２２面に形成したレンズステツプ
２３，２３……によつて適宜屈折拡散され、指向
性を与えられて、所定の配光パターンを形成し、
所定の照度分布による配光特性が得られる。又、
上記車輌用灯具８における光源すなわち電球の取
付位置は灯室の側面に内蔵される構造となるか
ら、レンズ２２正面側から灯具を見る場合、その
電球が見えず、デザイン上すつきりとした状態と
なる。 As described above, the reflected light beams from the light sources 24 and 25 projected almost uniformly onto the surface of the lens 22 are appropriately refracted and diffused by the lens steps 23, 23, . . . formed on the surface of the lens 22, and It is given directivity to form a predetermined light distribution pattern,
Light distribution characteristics based on a predetermined illuminance distribution can be obtained. or,
The mounting position of the light source, that is, the light bulb in the vehicle light fixture 8 is built into the side of the light chamber, so when the light fixture is viewed from the front side of the lens 22, the light bulb is not visible, and the design provides a clean and clear condition. becomes.

なお、上述した実施例においては、反射鏡２１
を構成する一対の半回転放物面鏡９及び１０を灯
具の左右方向に設け、光源２４及び２５を灯室の
左右両側面部１４，１５に設けたが、本考案車輌
用灯具は、この実施例に限らず、半回転放物面鏡
を灯具の上下方向に一対設け、灯室の上下の両側
面部に光源を設けるようにしてもよいし、場合に
よつては灯室の上下方向及び左右方向に即ち２対
の半回転放物面鏡を設けて宜く、この場合、レン
ズ面における光度の分布は一層均一なものとな
る。 In addition, in the embodiment described above, the reflecting mirror 21
A pair of semi-rotated parabolic mirrors 9 and 10 constituting the lamp were installed in the left and right direction of the lamp, and light sources 24 and 25 were installed on both the left and right sides 14 and 15 of the lamp chamber. Not limited to this example, a pair of semi-rotated parabolic mirrors may be provided in the vertical direction of the light fixture, and light sources may be provided on both the upper and lower sides of the light chamber, or in some cases, a pair of semi-rotated parabolic mirrors may be provided in the upper and lower directions of the light chamber, and in the left and right directions of the light chamber. In other words, two pairs of semi-rotated parabolic mirrors may be provided in the direction, in which case the distribution of light intensity on the lens surface will be more uniform.

応用例 １ 第４図は本考案車輌用灯具の別の実施例を示す
ものである。Application Example 1 FIG. 4 shows another embodiment of the vehicle lamp of the present invention.

この実施例においては、バルブ収納凹部２９，
２８内に、即ち、灯室１３の側面部１５，１４よ
り更に外側に半回転放物面鏡１０，９の焦点が存
在し、そして、該焦点位置に光源２５，２４のフ
イラメント２７，２８が位置するようにされてお
り、更に、バルブ収納凹部２９，２８の開口側の
前端部からは遮光部３２が突出されている。そし
て該遮光部３２の後端は光源２５，２４のフイラ
メント２７，２８と半回転放物面鏡１０，９の接
合部（稜線）１８とを結んだ線に接するか、該線
より僅かに後方にあるようにされている。 In this embodiment, the valve housing recess 29,
The focal points of the semi-rotating parabolic mirrors 10, 9 are located inside the lamp chamber 13, that is, further outside the side surfaces 15, 14 of the lamp chamber 13, and the filaments 27, 28 of the light sources 25, 24 are located at the focal positions. Furthermore, a light shielding portion 32 is projected from the front end portions of the bulb housing recesses 29 and 28 on the opening side. The rear end of the light shielding part 32 is in contact with a line connecting the filaments 27, 28 of the light sources 25, 24 and the joint (ridgeline) 18 of the semi-rotating parabolic mirrors 10, 9, or is slightly behind the line. It is as follows.

このように構成することによつて、光源２５，
２４からの直射光は灯具前方へ出射されず、反射
鏡２１で反射された光のみが出射され、従つて、
出射光のコントロールが容易となり、レンズ設計
が楽になる。 By configuring in this way, the light source 25,
The direct light from 24 is not emitted to the front of the lamp, but only the light reflected by the reflector 21 is emitted, and therefore,
Emitted light can be easily controlled, making lens design easier.

尚、第４図には灯具の右半分だけを示し左半分
の図示を省略してあるが、左半分においても同様
に構成されている。 Although FIG. 4 only shows the right half of the lamp and omits the left half, the left half has the same structure.

応用例 ２ 第５図は第４図に示した実施例の応用例であ
る。即ち、走行ビームとすれ違いビームとの両方
のビームを照射できる自動車用前照灯として応用
したものである。Application Example 2 FIG. 5 is an application example of the embodiment shown in FIG. That is, it is applied as an automobile headlamp that can emit both a driving beam and a passing beam.

図面において、右側のバルブ収納凹部２９内に
は２つのフイラメント３３及び３４を備えた光源
用の電球３５が配置されている。そして、フイラ
メント３３は走行ビーム用のもので、半回転放物
面鏡１０の略焦点位置に配置され、フイラメント
３４はすれ違いビーム用のもので、半回転放物面
鏡１０の焦点より前側（レンズ２２側）で、か
つ、該焦点を通る軸線より上側、即ち、路面から
遠ざかる方向に外れた位置に配置されている。 In the drawing, a light bulb 35 for a light source having two filaments 33 and 34 is arranged in the bulb housing recess 29 on the right side. The filament 33 is for the traveling beam, and is arranged approximately at the focal point of the semi-rotating parabolic mirror 10, and the filament 34 is for the passing beam, and is located in front of the focal point of the semi-rotating parabolic mirror 10 (lens 22 side) and above the axis passing through the focal point, that is, at a position away from the road surface in the direction away from the road surface.

このような実施例において、すれ違いビーム用
フイラメント３４を点灯すると、その光は半回転
放物面鏡１０によつて反射され図面において右側
へかつ下方向に傾斜して照射される。 In such an embodiment, when the passing beam filament 34 is turned on, the light is reflected by the half-rotation parabolic mirror 10 and is emitted to the right and downward in the drawing.

尚、この灯具の左側では、図示していないがバ
ルブ収納凹部内に配置される光源用電球のすれ違
いビーム用フイラメントは左側の半回転放物面鏡
９の焦点位置より後側、即ち反レンズ側でかつ該
焦点を通る軸線より上側、即ち路面から遠ざかる
方向に外れた位置に配置されている。従つて、左
側のすれ違いビーム用フイラメントから出射さ
れ、左側の半回転放物面鏡によつて反射された光
も、右側におけるすれ違いビームと同様に右向き
かつ下向きに照射される。 Note that on the left side of this lamp, the filament for the passing beam of the light source bulb placed in the bulb storage recess (not shown) is located behind the focal point of the left half-rotation parabolic mirror 9, that is, on the opposite side of the lens. and is located above the axis passing through the focal point, that is, at a position away from the road surface in a direction away from the road surface. Therefore, the light emitted from the left-side passing beam filament and reflected by the left-hand half-rotation parabolic mirror is also irradiated rightward and downward like the passing beam on the right side.

このような第５図に示した車輌用灯具において
は、すれ違いビームの照射に関して反射鏡２１の
全反射面を有効に使うことができ、きわめて効率
の良い照射を行なうことができる。 In the vehicle lamp shown in FIG. 5, the total reflection surface of the reflecting mirror 21 can be effectively used for irradiating the passing beam, and extremely efficient irradiation can be achieved.

尚、第５図の実施例において、左右のどちらか
一方の電球をシングルフイラメント（走行ビーム
用のみ）のものとしても良い。 In the embodiment shown in FIG. 5, either the left or right light bulb may be a single filament (only for the running beam).

効 果 以上に記載したように、本考案車輌用灯具にお
いては、灯室の両側部に反灯室側に突出した凹部
を形成し、該凹部内にそれぞれ焦点を有する回転
放物面鏡を少なくとも一対設けて反射鏡を構成
し、該各回転放物面鏡の略焦点位置に光源を配置
し、反射鏡の前面開口部をレンズにて覆つたの
で、光源からの光をレンズ面に均一に投射して、
レンズ面における光度を均一にすることができる
から、良好な配光が得られ、又、自動車の前照灯
に用いた場合には、対向車輌への眩惑を和らげ交
通の安全に寄与し、しかも灯具の意匠的効果も増
大するといつた優れた利点を有する。Effects As described above, in the vehicle lamp of the present invention, recesses are formed on both sides of the light chamber that protrude toward the opposite side of the light chamber, and at least parabolic mirrors of revolution each having a focal point are installed in the recesses. A pair of reflecting mirrors were provided, a light source was placed approximately at the focal point of each of the rotating parabolic mirrors, and the front opening of the reflecting mirror was covered with a lens, so that the light from the light source was distributed uniformly onto the lens surface. Project it,
Since the luminous intensity on the lens surface can be made uniform, good light distribution can be obtained, and when used in car headlights, it reduces dazzling to oncoming vehicles and contributes to traffic safety. It has an excellent advantage of increasing the design effect of the lamp.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の車輌用灯具の一例を示すもの
で、Ａは正面図、ＢはＡ図のＢ−Ｂ線に沿つて切
断した平面図、第２図は本考案車輌用灯具に用い
る反射鏡の構造原理を説明するために示したもの
で、Ａは放物線を示す平面図、Ｂは回転放物面を
示す斜視図、第３図は本考案車輌用灯具の実施の
一例を示し、Ａは正面図、ＢはＡのＢ−Ｂ線に沿
つて切断した横断平面図。ＣはＡ図のＣ−Ｃ線に
沿つて切断した縦断側面図、第４図は本考案車輌
用灯具の別の実施例を示す右半分の横断平面図、
第５図は４図のものの変形例を示す右半分の横断
平面図である。 符号の説明、９……回転放物面鏡、１０……回
転放物面鏡、１３……灯室、１４……側面部、１
５……側面部、２１……反射鏡、２２……レン
ズ、２４……光源、２５……光源、２８……凹
部、２９……凹部、３５……光源。 Fig. 1 shows an example of a conventional vehicular lamp, in which A is a front view, B is a plan view taken along line B-B in Fig. A, and Fig. 2 is a reflective light used in the vehicular lamp of the present invention. The figures are shown to explain the structural principle of the mirror, where A is a plan view showing a parabola, B is a perspective view showing a paraboloid of rotation, and Figure 3 shows an example of implementation of the vehicle lamp of the present invention. B is a front view, and B is a cross-sectional plan view cut along the line B-B of A. C is a longitudinal cross-sectional side view cut along the line C-C in Fig. A, and Fig. 4 is a cross-sectional plan view of the right half showing another embodiment of the vehicle lamp of the present invention.
FIG. 5 is a cross-sectional plan view of the right half showing a modification of the one shown in FIG. Explanation of symbols, 9... Parabolic mirror of revolution, 10... Parabolic mirror of revolution, 13... Light chamber, 14... Side part, 1
5...Side portion, 21...Reflector, 22...Lens, 24...Light source, 25...Light source, 28...Concave portion, 29...Concave portion, 35...Light source.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 灯室の両側部に反灯室側に突出した凹部を形成
し、該凹部内にそれぞれ焦点を有する回転放物面
鏡を少なくとも一対設けて反射鏡を構成し、該各
回転放物面鏡の略焦点位置に光源を配置し、反射
鏡の前面開口部をレンズにて覆つたことを特徴と
する車輌用灯具。 Concave portions protruding toward the opposite side of the light chamber are formed on both sides of the lamp chamber, and at least one pair of parabolic mirrors of revolution each having a focal point is provided in the concave portions to constitute a reflecting mirror. A vehicle lamp characterized in that a light source is arranged at a substantially focal position and a front opening of a reflecting mirror is covered with a lens.