JPH0247530Y2 - - Google Patents
Info
- Publication number
- JPH0247530Y2 JPH0247530Y2 JP12336386U JP12336386U JPH0247530Y2 JP H0247530 Y2 JPH0247530 Y2 JP H0247530Y2 JP 12336386 U JP12336386 U JP 12336386U JP 12336386 U JP12336386 U JP 12336386U JP H0247530 Y2 JPH0247530 Y2 JP H0247530Y2
- Authority
- JP
- Japan
- Prior art keywords
- pair
- revolution
- light
- lamp
- mirror
- 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
- 230000004907 flux Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
Description
【考案の詳細な説明】
〔産業上の利用分野〕
本考案は車輛用灯具に係り、特に、ランプハウ
ジング内に１対の共軛焦点を有する凹面鏡を設け
て、その一方の焦点に光源を位置せしめた車輛用
灯具に関するものである。[Detailed description of the invention] [Field of industrial application] The present invention relates to a vehicle lamp, and in particular, a concave mirror having a pair of convergent focal points is provided in a lamp housing, and a light source is positioned at one of the focal points. This relates to a vehicle lamp.
この種の車輛用灯具としては、実公昭57−
35485号公報に記載の技術が公知である。
As this type of vehicle light,
The technique described in Japanese Patent No. 35485 is known.
第３図は上記公知例の断面図で、１対の共軛焦
点Ｆ，F′を有する楕円反射鏡１を構成するととも
に、上記１対の共軛焦点の内の一方の焦点Ｆに光
源２を位置せしめるように電球３を設置し、前記
楕円反射鏡１をランプハウジングに兼用してその
前方開口部にレンズ４を取付けて覆つた構造であ
る。 FIG. 3 is a cross-sectional view of the above-mentioned known example, in which an elliptical reflecting mirror 1 having a pair of conjoint focal points F and F' is constructed, and a light source 2 is placed at one focal point F of the pair of conjoint focal points. In this structure, a light bulb 3 is installed so that the lamp housing is positioned, and the elliptical reflector 1 is also used as a lamp housing, and a lens 4 is attached to the front opening of the lamp housing to cover the lamp housing.
上記公知例によれば、一方の焦点Ｆから出射し
た光束の一部は他方の焦点F′に集光して投射され
るので、灯具の奥行寸法を深く構成でき、しかも
光束の有効利用度が高いという優れた効果が有
る。 According to the above-mentioned known example, a part of the luminous flux emitted from one focal point F is condensed and projected onto the other focal point F', so that the depth of the lamp can be configured deep and the effective utilization of the luminous flux can be increased. It has an excellent effect of being high.
〔考案が解決しようとする問題点〕 しかし乍
ら、前記の構成に係る灯具においては楕円面鏡の
光学的特性の結果として、図示Ａ付近の光束分布
が密で光度が大きく、図示Ｂ付近は光束分布が疎
で光度が小さいという問題が有る。[Problems to be solved by the invention] However, as a result of the optical characteristics of the ellipsoidal mirror in the lamp according to the above configuration, the luminous flux distribution near A in the figure is dense and the luminous intensity is high, and the luminous intensity near B in the figure is high. There is a problem that the luminous flux distribution is sparse and the luminous intensity is low.
本考案は上記の事情に鑑みて為されたもので、
奥行寸法が小さくて光束の有効利用率が高く、し
かもレンズ面の全面にわたつて均一な光度分布が
得られる車輛用灯具を提供することを目的とす
る。 This idea was created in view of the above circumstances.
To provide a vehicular lamp which has a small depth dimension, has a high effective utilization rate of luminous flux, and can obtain a uniform luminous intensity distribution over the entire lens surface.
上記の目的を達成する為、本考案の車輛用灯具
は、ランプハウジングの中に１対の共軛焦点を有
する凹面鏡を設け、かつ、上記１対の共軛焦点の
何れか一方に光源を設置した車輛用灯具におい
て、前記の凹面鏡は１対の共軛焦点を結ぶ線を対
称軸とする１対の回転放物面を有するものである
ことを特徴とする。
In order to achieve the above object, the vehicle lamp of the present invention includes a concave mirror having a pair of convergent focal points in the lamp housing, and a light source installed at one of the pair of convergent focal points. In the vehicle lamp, the concave mirror has a pair of paraboloids of revolution whose axis of symmetry is a line connecting a pair of conjugate foci.
上記のように構成した車輛用灯具においては、
一方の焦点に位置する光源から出た光束の一部は
他方の焦点に集光して投光されるので、灯具の奥
行寸法が短く、しかも光束の有効利用率が高い。
その上、上記一方の焦点から出射して回転放物面
鏡で反射した光は平行光束となつて他方の焦点に
向かい、再び回転放物面鏡によつて集光されるの
で、光束に著しい疎密の差を生じる虞れが無く、
レンズ全面が均一に発光する。
In the vehicle light constructed as above,
A part of the luminous flux emitted from the light source located at one focal point is condensed and projected at the other focal point, so the depth dimension of the lamp is short and the effective utilization rate of the luminous flux is high.
Furthermore, the light emitted from one of the focal points and reflected by the parabolic mirror of revolution becomes a parallel beam of light that heads toward the other focal point and is again condensed by the parabolic mirror of revolution, resulting in a significant change in the luminous flux. There is no risk of creating a difference in density,
The entire surface of the lens emits light evenly.
第１図は本考案の一実施例を示し、ｆ，f′は共
軛焦点である。
FIG. 1 shows an embodiment of the present invention, where f and f' are conjoint foci.
上記１対の焦点ｆ，f′を結ぶ線Ｘ−Ｘを対象軸
とする１対の回転放物面ｐ，p′を想定し、これに
沿つて１対の回転放物面鏡５，５′を構成する。 Assuming a pair of paraboloids of revolution p, p' whose symmetric axis is the line X-X connecting the pair of focal points f, f', a pair of parabolic mirrors 5, 5 ′ constitutes.
上記１対の回転放物面ｐ−p′の交点Ａの近傍
は、この実施例の灯具の奥行寸法Ｗを小さくする
ためカツトした形に平面鏡６に構成してある。 The vicinity of the intersection A of the pair of paraboloids of revolution p-p' is formed into a cut-off plane mirror 6 in order to reduce the depth dimension W of the lamp of this embodiment.
３′は焦点ｆに設置した電球、４′はレンズであ
る。 3' is a light bulb installed at the focal point f, and 4' is a lens.
電球３′のフイラメント（焦点ｆ）から出射し
た光の内、矢印a1，a2，a3の如く回転放物面鏡５
に入射した光は、矢印b1，b2，b3の如く軸Ｘ−Ｘ
と平行な光束となり、回転放物面鏡５′で反射さ
れて矢印c1，c2，c3の如く焦点f′に集光する。 Among the light emitted from the filament (focal point f) of the light bulb 3', as shown by arrows a 1 , a 2 , and a 3 , the parabolic mirror 5 of revolution
The light incident on the axis X-X as shown by arrows b 1 , b 2 , b 3
It becomes a light beam parallel to , is reflected by the rotating parabolic mirror 5', and is focused at the focal point f' as indicated by arrows c 1 , c 2 , and c 3 .
また、平面鏡６に入射した光は必ずしも焦点
f′には集まらないが、矢印a4の如く平面鏡６の中
央付近に入射した光は矢印c4の如く焦点f′に向か
う。 Furthermore, the light incident on the plane mirror 6 is not necessarily at the focal point.
Although it does not converge at f', the light incident near the center of the plane mirror 6 as indicated by arrow a4 heads toward focal point f' as indicated by arrow c4 .
前記の矢印b1，b2，b3が平行光束をなしてお
り、かつ、矢印a1，a2，a3と同c1，c2，c3とが対
称形をなしていることから容易に理解できよう、
焦点f′を通過した光矢印d1，d2，d3は均一に分散
し、レンズ４′の面を均一に発光させる。 Since the above-mentioned arrows b 1 , b 2 , and b 3 form a parallel beam of light, and the arrows a 1 , a 2 , and a 3 are symmetrical to c 1 , c 2 , and c 3 , easy to understand,
The light arrows d 1 , d 2 , d 3 that have passed through the focal point f' are uniformly dispersed, causing the surface of the lens 4' to emit light uniformly.
また、矢印a1〜a4の光が、すべて矢印d1〜d4の
如く有効に投射されるので、光束の有効利用率が
高い。 Moreover, since all the lights of arrows a 1 to a 4 are effectively projected as shown by arrows d 1 to d 4 , the effective utilization rate of the luminous flux is high.
第２図は前記と異なる実施例を示し、第１図と
同一の図面参照番号を付したものは前記実施例に
おけると同様及至は類似の構成部分である。 FIG. 2 shows a different embodiment from the above, and the same drawing reference numbers as in FIG. 1 indicate the same or similar components as in the previous embodiment.
前例と同様に１対の回転放物面ｐ−p′に沿つて
１対の回転放物面鏡５，５′を構成するとともに、
焦点ｆ，f′を共軛焦点として共有する回転楕円面
ｅを想定し、該回転楕円面ｅに沿つて回転楕円面
鏡７を構成する。 As in the previous example, a pair of paraboloid mirrors 5 and 5' are configured along a pair of paraboloids of revolution p-p', and
Assuming an ellipsoid of revolution e that shares focal points f and f' as conjoint focal points, the ellipsoid of revolution mirror 7 is constructed along the ellipsoid of revolution e.
前記回転放物面鏡５，５′と回転楕円面鏡７と
は、滑らかに接続してもよく、また、角を立てて
接続してもよい。 The parabolic mirrors 5, 5' of revolution and the ellipsoidal mirror 7 may be connected smoothly or at an angle.
本例（第２図）においては、矢印a5，a6の如く
回転楕円面鏡７の任意の部分に入射した光は矢印
c5，c6の如く焦点f′に集まる。本例（第２図）に
よつても前例（第１図）と同様の効果が得られ、
僅かながら前例よりも光束の有効利用率が高い。 In this example (Fig. 2), the light incident on any part of the spheroidal mirror 7 as indicated by arrows a 5 and a 6 is
It gathers at the focal point f' like c 5 and c 6 . This example (Figure 2) also provides the same effect as the previous example (Figure 1),
The effective utilization rate of luminous flux is slightly higher than the previous example.
以上詳述したように、本考案の車輛用灯具は奥
行寸法が小さくて光束の有効利用率が高く、しか
もレンズの全面にわたつて均一な光度分布が得ら
れるという優れた実用的効果を奏する。
As described above in detail, the vehicle lamp of the present invention has a small depth dimension, a high efficiency of luminous flux utilization, and has excellent practical effects in that a uniform luminous intensity distribution can be obtained over the entire surface of the lens.
第１図は本考案の車輛用灯具の一実施例を示す
模式的な断面図、第２図は上記と異なる実施例の
模式的な断面図である。第３図は公知例の説明図
である。
３，３′……光源としての電球、４，４′……レ
ンズ、５，５′……回転放物面鏡、６……平面鏡、
７……回転楕円面鏡、ｐ−p′……回転放物面、ｅ
……回転楕円面、ｆ，f′……共軛焦点。
FIG. 1 is a schematic sectional view showing one embodiment of the vehicle lamp of the present invention, and FIG. 2 is a schematic sectional view of an embodiment different from the above. FIG. 3 is an explanatory diagram of a known example. 3, 3'... Light bulb as a light source, 4, 4'... Lens, 5, 5'... Parabolic mirror of revolution, 6... Plane mirror,
7...Ellipsoidal mirror of revolution, p-p'...paraboloid of revolution, e
...Ellipsoid of revolution, f, f'...Conjoint focus.
Claims (1)
る凹面鏡を設け、かつ、上記１対の共軛焦点の何
れか一方に光源を設置した車輛用灯具において、
前記の凹面鏡は１対の共軛焦点を結ぶ線を対称軸
とする１対の回転放物面を有するものであること
を特徴とする車輛用灯具。 In a vehicle lamp, a concave mirror having a pair of convergent focal points is provided in the lamp housing, and a light source is installed at one of the pair of convergent focal points,
A vehicular lamp characterized in that the concave mirror has a pair of paraboloids of revolution whose axis of symmetry is a line connecting a pair of conjugate foci.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12336386U JPH0247530Y2 (en) | 1986-08-13 | 1986-08-13 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12336386U JPH0247530Y2 (en) | 1986-08-13 | 1986-08-13 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6329806U JPS6329806U (en) | 1988-02-26 |
| JPH0247530Y2 true JPH0247530Y2 (en) | 1990-12-13 |
Family
ID=31014402
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12336386U Expired JPH0247530Y2 (en) | 1986-08-13 | 1986-08-13 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0247530Y2 (en) |
-
1986
- 1986-08-13 JP JP12336386U patent/JPH0247530Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6329806U (en) | 1988-02-26 |
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