JP5506610B2

JP5506610B2 - Lamp unit

Info

Publication number: JP5506610B2
Application number: JP2010198440A
Authority: JP
Inventors: 英隆岡田
Original assignee: Stanley Electric Co Ltd
Current assignee: Stanley Electric Co Ltd
Priority date: 2010-09-06
Filing date: 2010-09-06
Publication date: 2014-05-28
Anticipated expiration: 2030-09-06
Also published as: JP2012059374A

Description

本発明は、灯具ユニットに関する。 The present invention relates to a lamp unit.

従来、車両用信号灯や装飾灯などに用いられる灯具ユニットとして、例えば特許文献１に記載のような、前方へライン状に発光するものが知られている。 2. Description of the Related Art Conventionally, as a lamp unit used for a vehicle signal lamp, a decorative lamp, or the like, a unit that emits light in a line shape forward as described in Patent Document 1, for example, is known.

この特許文献１に記載の灯具ユニット９００は、図６に示すように、ＬＥＤ等の光源９０１と、光源９０１の前方に配置された左右に長尺な導光体９０２とを備えている。導光体９０２には、光源９０１を焦点とする回転放物面状の左右一対の第１反射面９０２ａ，９０２ａが前面の中央部に形成され、左右へ長尺な出射面９０２ｂが第１反射面９０２ａ，９０２ａの左右両側に形成され、複数の第２反射面９０２ｃ，…が出射面９０２ｂと反対側の面に断続的に形成されている。 As shown in FIG. 6, the lamp unit 900 described in Patent Document 1 includes a light source 901 such as an LED, and a light guide body 902 that is long in the left and right positions disposed in front of the light source 901. The light guide 902 is formed with a pair of left and right first reflecting surfaces 902a and 902a having a paraboloidal shape focusing on the light source 901 at the center of the front surface, and a light emitting surface 902b elongated to the left and right is a first reflecting surface. A plurality of second reflecting surfaces 902c,... Are intermittently formed on the surface opposite to the exit surface 902b.

このような構成により、灯具ユニット９００では、光源９０１から出射されて入射面９０２ｄを通じて導光体９０２内へ入射した光が、一対の第１反射面９０２ａ，９０２ａで左右へ反射され、複数の第２反射面９０２ｃ，…で前方へ反射されて出射面９０２ｂから拡散出射されることにより、当該出射面９０２ｂがライン状に発光するようになっている。 With this configuration, in the lamp unit 900, light emitted from the light source 901 and incident into the light guide 902 through the incident surface 902d is reflected left and right by the pair of first reflecting surfaces 902a and 902a, and a plurality of first The reflection surface 902c,... Is reflected forward and diffused and emitted from the emission surface 902b, so that the emission surface 902b emits light in a line shape.

特許第４２９０６０１号公報Japanese Patent No. 4290601

しかしながら、上記の灯具ユニット９００では、第１反射面９０２ａ，９０２ａによって光を左右方向だけに制御しているために、出射面９０２ｂを幅方向（図６の紙面垂直方向）に広く発光させることが難しい。より詳しくは、灯具ユニット９００において単純に出射面９０２ｂを幅広に発光させようとすると、回転放物面状の第１反射面９０２ａ，９０２ａを幅広に形成する結果、当該第１反射面９０２ａ，９０２ａが前後に長くなって導光体９０２の肉厚が増してしまうため、導光体９０２の材料コストや成型時間の点において好ましくない。 However, in the lamp unit 900 described above, since the light is controlled only in the left-right direction by the first reflecting surfaces 902a, 902a, the emission surface 902b can emit light widely in the width direction (perpendicular to the paper surface in FIG. 6). difficult. More specifically, in the lamp unit 900, when the emission surface 902b is simply made to emit light broadly, the first reflection surfaces 902a and 902a are formed as a result of forming the parabolic first reflection surfaces 902a and 902a wide. However, this is not preferable in terms of material cost and molding time of the light guide body 902 because the thickness of the light guide body 902 increases as the length increases.

また、灯具ユニット９００において、入射面９０２ｄを光源９０１からの光が光軸に沿った平行光とされる曲面とし、第１反射面９０２ａ，９０２ａを平面としたときであっても、出射面９０２ｂを幅広に発光させようとした場合には、入射面９０２ｄによって光を幅方向へ広く入射させようとする結果、当該入射面９０２ｄが前後に長い面となり、やはり導光体９０２が厚肉に形成されてしまう。 Further, in the lamp unit 900, even when the incident surface 902d is a curved surface in which the light from the light source 901 is parallel light along the optical axis, and the first reflecting surfaces 902a and 902a are flat, the emission surface 902b. When the light is emitted in a wide range, the incident surface 902d becomes a long surface in the front-rear direction as a result of attempting to make the light widely incident in the width direction by the incident surface 902d, and the light guide 902 is also formed thick. Will be.

本発明は、上記事情を鑑みてなされたもので、導光体を厚肉にすることなく出射面を幅広に発光させることのできる灯具ユニットの提供を課題とする。 This invention is made | formed in view of the said situation, and makes it a subject to provide the lamp unit which can light-emit a light emission surface widely, without making a light guide thick.

上記課題を解決するために、請求項１に記載の発明は、灯具ユニットにおいて、
前方を向く光軸を有する光源と、前記光軸と直交する光軸直交方向に延在するように前記光源の前方に配設された導光体と、を備え、
前記導光体は、
前記光源から出射された光を当該導光体内へ入射させる入射部と、
前記入射部から当該導光体内へ入射した光を前記光軸直交方向へ内部反射させる第１反射面と、
前記入射部から当該導光体内へ入射した光のうち前記第１反射面への入射光を除くものを、前記光軸に沿った光軸方向及び前記光軸直交方向の何れにも直交する当該導光体の幅方向へ内部反射させる第２反射面と、
前記第２反射面で前記幅方向へ内部反射された光を前記光軸直交方向へ内部反射させる第３反射面と、
前記第１反射面及び前記第３反射面で前記光軸直交方向へ内部反射された光を前記光軸方向へ内部反射させる第４反射面と、
前記第４反射面で内部反射された光を当該導光体内から出射させる出射面と、
を有することを特徴とする。 In order to solve the above problem, the invention according to claim 1 is a lamp unit,
A light source having an optical axis facing forward, and a light guide disposed in front of the light source so as to extend in a direction perpendicular to the optical axis perpendicular to the optical axis,
The light guide is
An incident part for entering the light emitted from the light source into the light guide;
A first reflecting surface for internally reflecting light incident on the light guide from the incident portion in the direction perpendicular to the optical axis;
Of the light that has entered the light guide from the incident portion, light that is not incident on the first reflecting surface is orthogonal to both the optical axis direction along the optical axis and the optical axis orthogonal direction. A second reflecting surface for internal reflection in the width direction of the light guide;
A third reflecting surface for internally reflecting light internally reflected in the width direction by the second reflecting surface in a direction perpendicular to the optical axis;
A fourth reflecting surface for internally reflecting light internally reflected in the optical axis orthogonal direction by the first reflecting surface and the third reflecting surface in the optical axis direction;
An emission surface for emitting the light internally reflected by the fourth reflection surface from the light guide;
It is characterized by having.

請求項２に記載の発明は、請求項１に記載の灯具ユニットにおいて、
前記入射部は、前記光源から出射された光を前記光軸方向への平行光としつつ前記導光体内へ入射させ、
前記第１反射面及び前記第２反射面は、前記入射部の前記光軸方向に位置するとともに、前記光軸に対し４５度の角度で前記光軸直交方向及び前記幅方向へ傾斜する面であり、
前記第３反射面は、前記第２反射面の前記幅方向に位置するとともに、前記幅方向に対し４５度の角度で前記光軸直交方向へ傾斜する面であり、
前記第４反射面は、第１反射面及び第３反射面の前記光軸直交方向に位置するとともに、前記光軸に対し４５度の角度で前記光軸直交方向へ傾斜する面であることを特徴とする。 The invention according to claim 2 is the lamp unit according to claim 1,
The incident portion causes the light emitted from the light source to enter the light guide while being parallel light in the optical axis direction,
The first reflection surface and the second reflection surface are surfaces that are located in the optical axis direction of the incident portion and are inclined in the optical axis orthogonal direction and the width direction at an angle of 45 degrees with respect to the optical axis. Yes,
The third reflection surface is a surface that is located in the width direction of the second reflection surface and is inclined in the direction orthogonal to the optical axis at an angle of 45 degrees with respect to the width direction.
The fourth reflecting surface is a surface that is located in the direction orthogonal to the optical axis of the first reflecting surface and the third reflecting surface and is inclined in the direction orthogonal to the optical axis at an angle of 45 degrees with respect to the optical axis. Features.

本発明によれば、光源から出射されて導光体内へ入射した光が、第１反射面と第２反射面とにより光軸直交方向（導光体が延在する方向）と導光体の幅方向とに分岐され、このうち第２反射面により幅方向へ内部反射された光が、第３反射面により光軸直交方向へ更に内部反射される。そして、第１反射面と第３反射面とで光軸直交方向へ内部反射された光は、第４反射面を経て出射面から導光体外へ出射する。このように、第２反射面及び第３反射面によって導光体の幅方向へ光を制御しているので、従来のように導光体を厚肉にすることなく、出射面を幅広に発光させることができる。 According to the present invention, the light emitted from the light source and incident on the light guide body is perpendicular to the optical axis (the direction in which the light guide body extends) between the first reflection surface and the second reflection surface and the light guide body. The light that is branched in the width direction and is internally reflected in the width direction by the second reflecting surface is further internally reflected in the direction orthogonal to the optical axis by the third reflecting surface. And the light internally reflected by the 1st reflective surface and the 3rd reflective surface in the optical axis orthogonal direction is radiate | emitted out of a light guide from an output surface through a 4th reflective surface. In this way, since the light is controlled in the width direction of the light guide by the second reflection surface and the third reflection surface, the emission surface emits light without increasing the thickness of the light guide as in the prior art. Can be made.

実施形態における灯具ユニットの正面図である。It is a front view of the lamp unit in an embodiment. 図１のII−II線での断面図である。It is sectional drawing in the II-II line of FIG. 図１のIII−III線での断面図である。It is sectional drawing in the III-III line of FIG. 導光体の背面図である。It is a rear view of a light guide. 導光ブロック内での光路を説明するための図である。It is a figure for demonstrating the optical path in a light guide block. 従来の灯具ユニットを説明するための図である。It is a figure for demonstrating the conventional lamp unit.

以下、本発明の実施形態について図面を参照して説明する。但し、発明の範囲は以下の実施形態及び図示例に限定されない。 Embodiments of the present invention will be described below with reference to the drawings. However, the scope of the invention is not limited to the following embodiments and illustrated examples.

＜灯具ユニットの構成＞
図１は、本実施形態における灯具ユニット１の正面図であり、図２及び図３は、図１のII−II線及びIII−III線での断面図であり、図４は、灯具ユニット１が備える導光体２０の背面図である。
図１〜図３に示すように、灯具ユニット１は、複数の光源１０，…と、光源１０，…の前方に配設された導光体２０とを備えており、これら光源１０，…及び導光体２０がベース板２と支持部材３とによって支持された構造となっている。 <Configuration of lamp unit>
FIG. 1 is a front view of a lamp unit 1 in the present embodiment, FIGS. 2 and 3 are cross-sectional views taken along lines II-II and III-III in FIG. 1, and FIG. It is a rear view of the light guide 20 with which is provided.
As shown in FIGS. 1 to 3, the lamp unit 1 includes a plurality of light sources 10,... And a light guide 20 disposed in front of the light sources 10,. The light guide 20 is supported by the base plate 2 and the support member 3.

光源１０，…は、例えば発光ダイオード等の発光体であり、前方を向く光軸Ａｘを有し、当該光軸Ａｘを中心に前方へ略放射状に光を照射するものである。これらの光源１０，…は、基板１１に個別に実装された状態で左右方向へ等間隔に並設されている。各基板１１は、制御基板１２に搭載され、当該制御基板１２を介してベース板２上に固定されている。 The light sources 10,... Are, for example, light emitters such as light emitting diodes, have an optical axis Ax facing forward, and irradiate light substantially radially forward about the optical axis Ax. These light sources 10 are arranged in parallel at equal intervals in the left-right direction while being individually mounted on the substrate 11. Each board 11 is mounted on a control board 12 and fixed on the base plate 2 via the control board 12.

導光体２０は、光源１０，…から出射された光をライン状に発光させるためのものである。この導光体２０は、光軸Ａｘと直交する左右方向に延在するように長尺に形成されており、支持部材３によって周面を支持されている。
具体的には、導光体２０は、各光源１０からの光を個別に導光する導光ブロック２００が左右方向に連結された形状をなしている。各導光ブロック２００は、左右方向の略中央で光源１０と対向して当該光源１０の光軸Ａｘを中心に左右対称形かつ上下対称形に形成されており、当該光源１０から出射された光を導光体２０内へ入射させる入射部２１と、導光体２０内から光を出射させる出射面２３と、入射部２１から出射面２３へ光を導く導光部２２と、を有している。 The light guide 20 is for emitting light emitted from the light sources 10,... In a line shape. The light guide 20 is formed in a long shape so as to extend in the left-right direction orthogonal to the optical axis Ax, and the peripheral surface thereof is supported by the support member 3.
Specifically, the light guide 20 has a shape in which light guide blocks 200 that individually guide light from each light source 10 are connected in the left-right direction. Each light guide block 200 is formed in a bilaterally symmetric shape and a vertically symmetric shape with the optical axis Ax of the light source 10 as a center so as to face the light source 10 at a substantially center in the left-right direction, and the light emitted from the light source 10 An incident portion 21 that makes the light incident on the light guide 20, an emission surface 23 that emits light from the light guide 20, and a light guide portion 22 that guides light from the incident portion 21 to the emission surface 23. Yes.

入射部２１は、光源１０と対向するように導光体２０の後面（光源１０側の面）に突設されている。入射部２１の後端には、後方へ膨出する凸面状（非球面）の入射面２１１が、光軸Ａｘを回転対称軸として当該光源１０と対向するように形成されている。この入射面２１１は、その焦点に光源１０が位置するように配設されており、光源１０から出射された光を光軸Ａｘに沿った方向（以下、光軸Ａｘ方向という）へ屈折させつつ導光体２０内へ入射させる。 The incident portion 21 protrudes from the rear surface (surface on the light source 10 side) of the light guide 20 so as to face the light source 10. A convex (aspheric) incident surface 211 bulging rearward is formed at the rear end of the incident portion 21 so as to face the light source 10 with the optical axis Ax as a rotational symmetry axis. The incident surface 211 is disposed so that the light source 10 is positioned at the focal point thereof, and refracts light emitted from the light source 10 in a direction along the optical axis Ax (hereinafter referred to as an optical axis Ax direction). Incident light enters the light guide 20.

導光部２２は、導光体２０の前面に形成された各一対の第１反射面２２１，２２１及び第２反射面２２２，２２２と、導光体２０の上下の側面に形成された複数の第３反射面２２３，…と、導光体２０の後面に形成された複数の第４反射面２２４，…とを有している。 The light guide unit 22 includes a plurality of first reflective surfaces 221 and 221 and second reflective surfaces 222 and 222 formed on the front surface of the light guide 20 and a plurality of upper and lower side surfaces of the light guide 20. And third reflective surfaces 223,... And a plurality of fourth reflective surfaces 224,.

このうち、第１反射面２２１，２２１及び第２反射面２２２，２２２は、入射部２１の光軸Ａｘ方向に位置するように導光体２０の前面に凹設されている。具体的には、第１反射面２２１，２２１は、光軸Ａｘに対し４５度の角度で左方向と右方向とに個別に傾斜した左右一対の反射面である。また、第２反射面２２２，２２２は、光軸Ａｘに対し４５度の角度で上方向と下方向とに個別に傾斜した上下一対の反射面である。そして、これら第１反射面２２１及び第２反射面２２２は、互いに同一面積の三角形状に形成されており、頂点を光軸Ａｘ上に位置させた正四角錘の周面を構成するように交互に連結されている。このような構成により、第１反射面２２１，２２１は、入射部２１から導光体２０内へ入射した光のうち当該第１反射面２２１，２２１へ入射した光を、光軸Ａｘを境に左方向及び右方向へ分岐させつつ内部反射させる。また、第２反射面２２２，２２２は、入射部２１から導光体２０内へ入射した光のうち第１反射面２２１，２２１への入射光を除くものを、光軸Ａｘを境に上方向及び下方向へ分岐させつつ内部反射させる。つまり、第１反射面２２１及び第２反射面２２２は、入射部２１から導光体２０内へ入射した光を、左右方向と上下方向とに略等分に分岐されるように内部反射させる。 Among these, the first reflecting surfaces 221 and 221 and the second reflecting surfaces 222 and 222 are recessed on the front surface of the light guide 20 so as to be positioned in the optical axis Ax direction of the incident portion 21. Specifically, the first reflecting surfaces 221 and 221 are a pair of left and right reflecting surfaces that are individually inclined in the left direction and the right direction at an angle of 45 degrees with respect to the optical axis Ax. The second reflecting surfaces 222 and 222 are a pair of upper and lower reflecting surfaces that are individually inclined upward and downward at an angle of 45 degrees with respect to the optical axis Ax. The first reflecting surface 221 and the second reflecting surface 222 are formed in a triangular shape having the same area, and are alternately arranged so as to constitute a peripheral surface of a regular square pyramid whose apex is located on the optical axis Ax. It is connected to. With such a configuration, the first reflection surfaces 221 and 221 receive light incident on the first reflection surfaces 221 and 221 out of the light incident from the incident portion 21 into the light guide 20 with the optical axis Ax as a boundary. Internal reflection while branching left and right. Further, the second reflecting surfaces 222 and 222 are light beams that enter the light guide 20 from the incident portion 21 except for the incident light to the first reflecting surfaces 221 and 221, and are upward from the optical axis Ax. And internally reflecting while branching downward. In other words, the first reflecting surface 221 and the second reflecting surface 222 internally reflect the light incident from the incident portion 21 into the light guide 20 so as to be divided into approximately equal parts in the left-right direction and the up-down direction.

第３反射面２２３，…は、図１及び図４に示すように、第２反射面２２２，２２２の上下方向に位置するように、導光体２０の上下の両側面に平面視Ｖ字状に凹設されている。この第３反射面２２３，…は、導光体２０の上下の各側面において、上下方向（導光体２０の幅方向）に対し４５度の角度で左方向と右方向とに個別に傾斜している。このような構成により、第３反射面２２３，…は、第２反射面２２２，２２２で上下方向へ内部反射された光を、左方向及び右方向へ分岐させつつ内部反射させる。 As shown in FIGS. 1 and 4, the third reflecting surfaces 223,... Are V-shaped in plan view on the upper and lower side surfaces of the light guide 20 so as to be positioned in the vertical direction of the second reflecting surfaces 222 and 222. Is recessed. The third reflecting surfaces 223,... Are individually inclined in the left direction and the right direction at an angle of 45 degrees with respect to the vertical direction (the width direction of the light guide 20) on the upper and lower side surfaces of the light guide 20. ing. With such a configuration, the third reflecting surfaces 223,... Internally reflect the light internally reflected in the vertical direction by the second reflecting surfaces 222, 222 while branching leftward and rightward.

第４反射面２２４，…は、図２及び図４に示すように、導光体２０の後面のうち入射部２１の左右両側部分にそれぞれ複数形成されている。この左右両側部分は階段状となっており、各段面２２ａが光軸Ａｘに直交するとともに導光ブロック２００内で光軸Ａｘから離れるに連れて段階的に前方に位置するように形成されている。各第４反射面２２４は、この各段面２２ａと左右方向へ交互に連なって当該階段状の面を構成しており、一対の第１反射面２２１，２２１のうち何れか近い方の第１反射面２２１と平行になるように、つまり光軸Ａｘに対して４５度の角度で左方向又は右方向へ傾斜するように形成されている。この第４反射面２２４，…は、第１反射面２２１，２２１及び第３反射面２２３，…の左右方向の両側に位置しており、当該第１反射面２２１，２２１及び第３反射面２２３，…で左方向及び右方向へ分岐して内部反射された光を光軸Ａｘ方向へ個別に内部反射させる。 As shown in FIGS. 2 and 4, a plurality of fourth reflecting surfaces 224,... Are formed on the left and right side portions of the incident portion 21 on the rear surface of the light guide 20. The left and right side portions are stepped, and are formed so that each step surface 22a is orthogonal to the optical axis Ax and is positioned forward in steps as the distance from the optical axis Ax increases in the light guide block 200. Yes. Each of the fourth reflecting surfaces 224 constitutes a stepped surface that is alternately connected to the respective step surfaces 22a in the left-right direction, and the first of the pair of first reflecting surfaces 221, 221 whichever is closer. It is formed so as to be parallel to the reflecting surface 221, that is, tilted leftward or rightward at an angle of 45 degrees with respect to the optical axis Ax. This 4th reflective surface 224, ... is located in the both sides of the left-right direction of the 1st reflective surface 221,221 and the 3rd reflective surface 223, ..., the said 1st reflective surface 221,221 and the 3rd reflective surface 223. ..,... Are branched into the left and right directions and internally reflected individually in the optical axis Ax direction.

出射面２３は、図１及び図２に示すように、第４反射面２２４，…の光軸Ａｘ方向に位置するように、導光体２０の前面のうち第１反射面２２１，２２１及び第３反射面２２３，…の左右両側に配設され、それぞれ光軸Ａｘに直交する平坦な面に形成されている。この出射面２３は、第４反射面２２４，…で内部反射された光を導光体２０内から出射させる。なお、出射面２３は、平坦な面でなくともよく、所望の発光態様に応じたレンズカットを有する面としてもよい。 As shown in FIGS. 1 and 2, the light exit surface 23 is positioned in the optical axis Ax direction of the fourth reflective surfaces 224,. .. Are disposed on the left and right sides of the three reflecting surfaces 223,... And are formed on flat surfaces orthogonal to the optical axis Ax. The emission surface 23 emits the light internally reflected by the fourth reflection surfaces 224,... From the light guide 20. The exit surface 23 does not have to be a flat surface, and may be a surface having a lens cut according to a desired light emission mode.

以上の構成を具備する導光ブロック２００では、図５（ａ），（ｂ）に示すように、光源１０から出射された光が、入射部２１により光軸Ａｘ方向への平行光とされつつ導光体２０内へ入射する。入射部２１から光軸Ａｘ方向へ進むこれらの平行光は、第１反射面２２１，２２１により光軸Ａｘを境に左方向及び右方向へ分岐されつつ内部反射されるとともに、第２反射面２２２，２２２により光軸Ａｘを境に上方向及び下方向へ分岐されつつ内部反射される。このうち、第２反射面２２２，２２２で内部反射された光は、第３反射面２２３，…により光軸Ａｘを境に左方向及び右方向へ分岐されつつ内部反射される。そして、第１反射面２２１，２２１及び第３反射面２２３，…で左方向及び右方向へ内部反射された光は、左右方向へ断続的に分布する第４反射面２２４，…によって左右方向に分散されつつ光軸Ａｘ方向へ個別に内部反射された後に、出射面２３から前方へ出射する。こうして、左右方向へ長尺な出射面２３が上下の全幅に亘って発光する。 In the light guide block 200 having the above configuration, as shown in FIGS. 5A and 5B, the light emitted from the light source 10 is being converted into parallel light in the optical axis Ax direction by the incident portion 21. The light enters the light guide 20. These parallel lights traveling in the optical axis Ax direction from the incident portion 21 are internally reflected while being branched leftward and rightward from the optical axis Ax by the first reflective surfaces 221 and 221 and are also reflected by the second reflective surface 222. , 222 are internally reflected while being branched upward and downward with the optical axis Ax as a boundary. Among these, the light internally reflected by the second reflecting surfaces 222, 222 is internally reflected while being branched leftward and rightward by the third reflecting surfaces 223,. And the light internally reflected in the left direction and the right direction by the first reflection surfaces 221, 221 and the third reflection surfaces 223, ... in the left-right direction by the fourth reflection surfaces 224, ... distributed intermittently in the left-right direction. After being internally reflected individually in the direction of the optical axis Ax while being dispersed, it is emitted forward from the emission surface 23. In this way, the emission surface 23 that is long in the left-right direction emits light over the entire vertical width.

＜作用・効果＞
以上の灯具ユニット１によれば、第２反射面２２２，２２２及び第３反射面２２３，…によって上下方向（導光体２０の幅方向）へ光を制御しているので、従来のように導光体を前後に厚肉にすることなく、出射面２３を幅広に発光させることができる。 <Action and effect>
According to the lamp unit 1 described above, the light is controlled in the vertical direction (the width direction of the light guide 20) by the second reflecting surfaces 222, 222 and the third reflecting surfaces 223,. The light emission surface 23 can emit light in a wide range without thickening the light body in the front-rear direction.

また、第１反射面２２１，２２１をそれぞれ光軸Ａｘと４５度の角度をなす平面としているので、当該第１反射面２２１，２２１をそれぞれ回転放物面状に形成していた従来の灯具ユニットに比べ、この第１反射面２２１，２２１による導光体２０の前面の凹みを小さくすることができ、見栄えを良くすることができる。 In addition, since the first reflecting surfaces 221 and 221 are flat surfaces each having an angle of 45 degrees with the optical axis Ax, the conventional lamp unit in which the first reflecting surfaces 221 and 221 are formed in a paraboloid shape, respectively. In comparison with the above, the depression of the front surface of the light guide 20 by the first reflecting surfaces 221 and 221 can be reduced, and the appearance can be improved.

＜変形例＞
なお、本発明を適用可能な実施形態は、上述した実施形態に限定されることなく、本発明の趣旨を逸脱しない範囲で適宜変更可能である。 <Modification>
The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

例えば、上記実施形態では、第１反射面２２１及び第２反射面２２２は、互いに同一面積に形成されて正四角錘の周面を構成するように交互に連結されるものとしたが、所望の発光態様に応じて各面積を異ならせてもよいし、各面を更に細分化してもよい。 For example, in the above-described embodiment, the first reflection surface 221 and the second reflection surface 222 are formed to have the same area and are alternately connected so as to form the peripheral surface of the regular square pyramid. Each area may be varied depending on the light emission mode, or each surface may be further subdivided.

また、入射部２１で入射された光が第１反射面２２１及び第２反射面２２２で左右方向及び上下方向に内部反射されるように構成されていれば、入射部２１は光源１０からの光を平行光としないものであってもよいし、第１反射面２２１及び第２反射面２２２は平面でなくともよい。 In addition, if the light incident on the incident portion 21 is configured to be internally reflected in the left and right directions and the vertical direction by the first reflecting surface 221 and the second reflecting surface 222, the incident portion 21 emits light from the light source 10. May not be parallel light, and the first reflecting surface 221 and the second reflecting surface 222 may not be flat.

１灯具ユニット
１０光源
２０導光体
２００導光ブロック
２１入射部
２１１入射面
２２導光部
２２１第１反射面
２２２第２反射面
２２３第３反射面
２２４第４反射面
２３出射面
Ａｘ光軸 DESCRIPTION OF SYMBOLS 1 Lamp unit 10 Light source 20 Light guide body 200 Light guide block 21 Incident part 211 Incident surface 22 Light guide part 221 1st reflective surface 222 2nd reflective surface 223 3rd reflective surface 224 4th reflective surface 23 Output surface Ax Optical axis

Claims

A light source having an optical axis facing forward, and a light guide disposed in front of the light source so as to extend in a direction perpendicular to the optical axis perpendicular to the optical axis,
The light guide is
An incident part for entering the light emitted from the light source into the light guide;
A first reflecting surface for internally reflecting light incident on the light guide from the incident portion in the direction perpendicular to the optical axis;
Of the light that has entered the light guide from the incident portion, light that is not incident on the first reflecting surface is orthogonal to both the optical axis direction along the optical axis and the optical axis orthogonal direction. A second reflecting surface for internal reflection in the width direction of the light guide;
A third reflecting surface for internally reflecting light internally reflected in the width direction by the second reflecting surface in a direction perpendicular to the optical axis;
A fourth reflecting surface for internally reflecting light internally reflected in the optical axis orthogonal direction by the first reflecting surface and the third reflecting surface in the optical axis direction;
An emission surface for emitting the light internally reflected by the fourth reflection surface from the light guide;
A lamp unit characterized by comprising:

The incident portion causes the light emitted from the light source to enter the light guide while being parallel light in the optical axis direction,
The first reflection surface and the second reflection surface are surfaces that are located in the optical axis direction of the incident portion and are inclined in the optical axis orthogonal direction and the width direction at an angle of 45 degrees with respect to the optical axis. Yes,
The third reflection surface is a surface that is located in the width direction of the second reflection surface and is inclined in the direction orthogonal to the optical axis at an angle of 45 degrees with respect to the width direction.
The fourth reflecting surface is a surface that is located in the direction orthogonal to the optical axis of the first reflecting surface and the third reflecting surface and is inclined in the direction orthogonal to the optical axis at an angle of 45 degrees with respect to the optical axis. The lamp unit according to claim 1, wherein the lamp unit is a lamp unit.