JP3861389B2

JP3861389B2 - lighting equipment

Info

Publication number: JP3861389B2
Application number: JP18687797A
Authority: JP
Inventors: 正山中; 光彦中辻
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 1996-08-21
Filing date: 1997-07-11
Publication date: 2006-12-20
Anticipated expiration: 2017-07-11
Also published as: JPH10116511A

Description

【０００１】
【発明の属する技術分野】
この発明は、照明器具に関するものである。
【０００２】
【従来の技術】
ランプからの紫外線をカットしたり、ランプ破損時に破片が外部に飛び散るのを防止したり、ランプの高熱部に対する保護等のため、前面にプロテクタを有する照明器具があった。
これに対して、点灯時に高温となるランプを使用した照明器具は下面開放型であったため、ランプや反射板に直接、手や物が触れるおそれがあった。またランプが万一破損した場合にランプの破片が飛び散った。このため、点灯時に高温となるランプを使用するものにおいても前面にプロテクタを設ける必要があった。
【０００３】
この種の従来例を図７に示す。すなわち、この従来例は、点灯時に高温になったランプ７０に直接手や物が触れないように、また紫外線をカットするように器具本体７１の開口７２を塞ぐ前面ガラス７３を開口７２に設けている。７４はランプソケットである。
一方、従来図８に示すように、グレアカットのため器具本体７１の開口７２の中央にグレアカットカバー７５を設けて、ランプ７０の直射光を遮るようにしたものがあった。
【０００４】
【発明が解決しようとする課題】
しかし、図７に示すプロテクタとしての前面ガラス７３とともに、図８に示すグレアカットカバー７５を器具本体７１の開口７２に設ける場合、構造が複雑になり、器具が大型になり、かつ部品点数が増大するという欠点があった。
したがって、この発明の目的は、部品点数を削減し構造を簡単にできかつ小型化できる照明器具を提供することである。
【０００５】
【課題を解決するための手段】
請求項１の照明器具は、開口を有しその開口の奥にランプソケットを有し前記ランプソケットに装着されたランプの光を前方に反射する反射開口のある反射部材を有する器具本体と、前記器具本体の前記開口を塞ぐように前記器具本体に設けられた透光部材とを備え、
前記ランプのランプフィラメントの先端から前記反射部材の開口端部へ入射する光の反射光が、前記ランプフィラメントと前記反射部材の開口中心を通る器具光軸に対して交差したときの交差鋭角を最大交差角としたとき、前記最大交差角以上の交差鋭角で前記透光部材に入射する前記ランプの直射光に対して入射角が臨界角となり、かつ前記最大交差角よりも小さい角度で前記透光部材に入射する前記反射部材の反射光に対して入射角が前記臨界角よりも小さくなるように、前記透光部材の形状を設定したことを特徴とするものである。
【０００６】
請求項１の照明器具によれば、透光部材によりランプ破損時の破片の外部への飛散が防止できる。また、ランプの直射光の器具光軸に対する交差角が反射部材の反射光の最大交差角以上の光は透光部材を全反射するのでグレアカットされる。また反射部材の反射光は最大交差角以下であるためすべて透光部材を透過する。したがって、直射光が反射部材の反射光の照射パターン外に照射されないので、美しい照射パターンが可能になる。さらに従来例と比較して部品点数を削減できコストダウンを図れるとともに、透光部材を保持する構造のみ備えてグレアカットのための保持構造は不要であるので構造が簡単で器具が小型化できる。
【０００９】
請求項２の照明器具は、開口を有しその開口の奥にランプソケットを有し前記ランプソケットに装着されたランプの器具光軸の方向に延びた発光部の光を前方に反射する反射部材を有する器具本体と、断面略山形であって頂部が平面となった傾斜面を有し前記頂部が前記ランプに向いて前記開口を塞ぐように前記器具本体に設けられた透光部材とを備え、
前記反射部材の反射光の前記器具光軸に対する最大交差角以上の交差鋭角で、前記透光部材に入射する前記発光部の器具光軸方向の後端からの直射光に対して、入射角が臨界角となるように前記透光部材の形状を設定するとともに、
前記器具光軸に対して前記最大交差角をもつ前記発光部の先端からの直射光が前記透光部材に入射する入射位置を内周端とし、かつ前記器具光軸に対して前記最大交差角をもつ前記発光部の前記後端からの前記直射光が前記透光部材に入射する入射位置を外周端とするリング状の範囲が前記頂部において前記透光部材の不透過部として形成され、さらに前記リング状の範囲よりも中心側の範囲を透過または不透過としたものである。
【００１０】
請求項２の照明器具によれば、器具光軸に対して最大交差角以上の交差角をもつ発光部の後端からの直射光は透光部材を全反射するためグレアカットされ、器具光軸に対して最大交差角以上の交差角をもつ発光部の先端からの直射光は不透過部および透光部材の全反射によりグレアカットされる。このように、発光部の先端および後端からの最大交差角の直射光で囲まれた光束をグレアカットするようにリング状の不透過部を形成したため、透光部材に入射する最大交差角の直射光に対して臨界角をなさない透過部材の中央部の形状を大きくすることができるとともに、器具光軸の方向の高さを低くすることができ、このため透光部材とランプとの間の距離を大きくすることができるので透光部材の温度を低減することができ、また透光部材の内側の器具本体内の容積を大きくすることができるのでランプ封止部や灯具外郭の温度の低減が可能となる。
さらに透光部材に不透過部を一体形成したため、従来例と比較して部品点数を削減できコストダウンを図れるとともに、グレアカット部の表面積を小さくできるため器具効率がアップする。その他、請求項１と同様な効果がある。
【００１１】
請求項３の照明器具は、請求項１または請求項２において、前記透光部材の形状は、前記反射部材の反射光の器具光軸に対する最大交差角以上の交差鋭角で前記透光部材に入射する前記ランプの直射光が、前記透光部材の外側表面で全反射するように前記透光部材の外側表面を凹設しているものである。
請求項３の照明器具によれば、請求項１または請求項２と同様な効果がある。
【００１２】
【発明の実施の形態】
この発明の第１の実施の形態を図１により説明する。すなわち、この照明器具は、器具本体１と、プロテクタとしての透光部材２とを有する。
器具本体１は、開口３を有し、その開口３の奥にランプソケット５を有する。実施の形態では、器具本体１は上端にアーム６を設け、アーム６の上端のフランジ６ａを天井（図示せず）に取付けている。この器具本体１にランプソケット５を取付け、ランプソケット５の前方に筒状のセード７を配置して器具本体１にねじ８により一体に取付け、セード７の前端にプロテクタ取付枠１８を取付けている。またランプソケット５に装着されるランプ１０を包囲する略筒状の赤外線反射板１１を、ねじ１２によりセード７に取付け、赤外線反射板１１の内部に反射部材として反射鏡であるダイクールミラー１３を挿入し、ダイクールミラー１３の先端部をランプ１０に通して赤外線反射板１１のソケット側端部の内つば１４に係止し、赤外線反射板１１の関口側端部の内周に形成した周溝１５に固定リング１６を嵌合し、この固定リング１６でダイクールミラー１３を押え固定している。ランプ１０はハロゲンランプのうちのミニハロゲンランプを用いている。１０ａは器具光軸Ｈの方向に延びた発光部であるフィラメント（楕円発光管）である。またダイクールミラー１３はランプソケット５に装着されたランプ１０の光を前方に反射する、具体的には器具光軸Ｈに略平行に反射するもので、ランプ１０の側面および背面に位置する。
【００１３】
透光部材２は、ランプソケット５に装着されたランプ１０のグレアカット用の不透過部２１を一体形成して開口３を塞ぐように器具本体１に設けられている。実施の形態では、透光部材２は光が透過し空気が不透過である材質であり、具体的には強化ガラスを用い、断面略山形すなわちこの実施の形態では略円錐台形状に形成され、上端部は部分球状に凹設し、その表面に黒色の塗装または可視光反射膜の蒸着を施して不透過部２１を形成している。この不透過部２１の大きさは、透光部材２を図１に示すように器具本体１に取付けた状態で、ランプ１０のフィラメント１０ａの後端と開口３の緑部とを結ぶ直線Ｌに交差する位置が最外周となるように決められて、確実なグレアカットを確保している。また透光部材２の下端部は外つば２２を形成しており、プロテクタ取付枠１８の内周に形成した内つば１９のランプソケット５側に載せている。そして、リング板状のガラス押え２３の内周側が低くなるように段曲げされており、その内周側で外つば２２を押え、外周側に形成したねじ挿通孔にばね２６付ねじ１７を通して、プロテクタ取付枠１８に形成したねじ孔にねじ込むことにより、ガラス押え２３で透光部材２を内つば１９に弾性的に押えて固定している。プロテクタ取付枠１８は外周につばを形成し、セード７の係止部７ａを挿通する切欠（図示せず）をつばに形成し、バヨネット式にプロテクタ取付枠１８を差込み回転することにより、つばを係止部７ａに係止してプロテクタ取付枠１８をセード７に取付けている。この場合ガラス押え２３にも係止部７ａを挿通する切欠を形成する。あるいはつばを省略してガラス押え２３に係止部７ａを挿通する切欠を形成してガラス押え２３を係止部７ａに係止してもよい。
【００１４】
この実施の形態によれば、透光部材２によりランプ破損時の破片の外部への飛散が防止でき、また不透過部２１こよりグレアカットすることができる。さらに透光部材２に不透過部２１を一体形成したため、従来例と比較して部品点数を削減できコストダウンを図れるとともに、グレアカット部の表面積を小さくできるため器具効率がアップし、また透光部材２を保持する構造のみ備えてグレアカットのための保持構造は不要なため構造が簡単で器具が小型化できる。
【００１５】
この発明の第２の実施の形態を図２に示す。すなわち、この照明器具は、第１の実施の形態において、透光部材２の形状を、反射部材であるダイクールミラー１３の反射光のうちのランプ１０の器具光軸Ｈに対して最大に交差する反射光Ｌ₁の最大交差角θ以上の交差鋭角で透光部材２に入射するランプ１０の直射光Ｌ₂に対して、透光部材２の表面への入射角が臨界角となるように設定している。ここで、最大交差角θとは、ランプフィラメント１０ａの先端（透光部材２に近い側）からダイクールミラー１３の開口端部への反射光Ｌ₁の器具光軸Ｈに対する交差角を指す。また実施の形態の透光部材２は、器具光軸Ｈ上を頂部として両側が器具光軸Ｈに対して一定勾配に傾斜した断面山形に形成しているが、全体形状は略円錐形状に形成している。そして、ランプ１０の直射光の入射角が、透光部材２に対して最大交差角θ以下となる部分すなわち透光部材２の平らな中央頂部に第１の実施の形態と同様に不透過部２１を設けている。
【００１６】
この実施の形態によれば、ランプ１０の直射光のうち器具光軸Ｈに対する交差角がダイクールミラー１３の反射光の最大交差角θ以上の直射光Ｌ₂は透光部材２を全反射するのでグレアカットされる。またダイクールミラー１３の反射光は最大交差角θ以下であるのですべて透光部材２を透過する。したがって、直射光がダイクールミラー１３の反射光の照射パターン外に照射されないため美しい照射パターンが可能になる。
【００１７】
また不透過部２１は第１の実施の形態と比較して小さい範囲でよくなる。その他の構成および作用効果は第１の実施の形態と同様である。なお、不透過部２１はなくてもよい。照明器具の透光部材２に向いた人の視線が最大交差角θ以下の場合は、ダイクールミラー１３の反射光が見えることになるので、最大交差角θ以下の場合フィラメント１０ａからの直射光はグレアカットする必要はないからである。たとえば、ランプ１０の先端にしぼりなどフィラメント１０ａの直射光の透過を妨げる構成があるものでは有効である。
【００１８】
この発明の第３の実施の形態を図３に示す。すなわち、この照明器具は、第２の実施の形態おいて、透光部材２の断面山形における傾斜面が断面形状で凹曲面に形成され、第２の実施の形態と同じ条件すなわちフィラメント１０ａの先端からの最大交差角θ以上の直射光Ｌ₂の透光部材２への入射角が臨界角以上の一定の角度となるようにしている。したがって、第２の実施の形態と同様の作用でランプ１０の直射光のグレアカットが行なわれる。またその他の構成および作用効果は、第２の実施の形態と同様である。
【００１９】
この発明の第４の実施の形態を図４に示す。すなわち、この照明器具は、第２の実施の形態おいて、透光部材２の形状を、反射部材２であるダイクールミラー１３の反射光の器具光軸Ｈに対する最大交差角θ以上の交差鋭角で、透光部材２に入射するフィラメント１０ａの後端からの直射光Ｌ₃に対して入射角が臨界角となるように設定している。
【００２０】
また器具光軸Ｈに対して最大交差角θをもつフィラメント１０ａの先端からの直射光Ｌ₂が透光部材２に入射する入射位置を内周端とし、かつフィラメント１０ａの後端からの直射光Ｌ₃が透光部材２に入射する入射位置を外周端とするリング状の範囲の透光部材２に不透過部２１を形成している。この不透過部２１は第１の実施の形態と同様に可視光反射膜の蒸着や黒色塗装を行なっている。したがって、この実施の形態における透光部材２の形状は、傾斜角は第２の実施の形態の透光部材２とほぼ等しい円錐台形状であるが、頂部の形状が大きく、その分軸方向の高さが低くなっている。また不透過部２１は頂部の外周側に円形リング状に形成されている。そして、さらに不透過部２１の内側の透光部材２上にも不透過部２１と同構成の不透過部を形成しているが、第２の実施の形態と同様な理由でなくてもよい。
【００２１】
この実施の形態によれば、器具光軸Ｈに対して最大交差角θ以上の交差角をもつフィラメント１０ａの後端からの直射光Ｌ₃は透光部材２を全反射するためグレアカットされ、器具光軸Ｈに対して最大交差角θ以上の交差角をもつフィラメント１０ａの先端からの直射光Ｌ₂は不透過部２１および透光部材２の全反射によりグレアカットされる。このように、フィラメント１０ａの先端および後端からの最大交差角θの直射光で囲まれた光束をグレアカットするようにリング状の不透過部２１を形成したため、透光部材２に入射する最大交差角θの直射光Ｌ₂，Ｌ₃に対して臨界角をなさない透過部材２の中央部の形状を大きくすることができるとともに、器具光軸Ｈの方向の高さを低くすることができ、このため透光部材２とランプ１０との間の距離を大きくすることができるので透光部材２の温度を低減することができ、また透光部材２の内側の器具本体１内の容積を大きくすることができるのでランプ封止部や灯具外郭の温度の低減が可能となる。
【００２２】
またその他の構成およびその作用効果は第３の実施の形態と同様である。
この発明の第５の実施の形態を図５に示す。すなわち、この照明器具は、第４の実施の形態おいて、透光部材２の傾斜面の形状を第３の実施の形態と同様に凹曲面に形成している点が異なっている。また第３の実施の形態と比較して透光部材２の頂部の形状が大きくなるとともに高さが低くなっており、頂部の外周に不透過部２１を形成している。その作用効果は第３の実施の形態および第４の実施の形態と同様であり、その他の構成および作用効果も第３の実施の形態および第４の実施の形態と同様である。
【００２３】
この発明の第６の実施の形態を図６に示す。すなわち、第５の実施の形態と異なる点は、透光部材２の形状を、ダイクールミラー１３の反射光Ｌ₁の器具光軸Ｈに対する最大交差角θ以上の交差鋭角で透光部材２に入射するランプ１０のフィラメント１０ａの後端側からの直射光Ｌ₃が、透光部材２の外側表面２ａで全反射するように透光部材２の外側表面２ａを凹設していることである。具体的な形状は第５の実施の形態の透光部材２の外側表面が類似し、内側表面は平らに形成している。その他の不透過部２１等の構成は第４の実施の形態および第５の実施の形態と同様である。
【００２４】
前記したように、人の視線が最大交差角θ以下の位置にある場合はダイクールミラー１３の反射光が見えることになるので、最大交差角θ以上の直射光をグレアカットする必要があるが、この実施の形態によれば、最大交差角θ以上のフィラメント１０ａの後端からの直射光Ｌ₃の透光部材２からの出射光はすべて臨界角以上の角度になり、この全反射および前記した不透過部２１によりグレアカットが可能となり、したがって第５の実施の形態と同様な作用効果が得られる。
【００２５】
また透光部材２の内側表面は平らにすることができ、このように内側表面を平らにしたときには透光部材２の加工が簡単になるとともに、透光部材２の器具光軸Ｈの方向の高さを短縮できるので透光部材２をより一層ランプ１０から離し、かつ透光部材２の内側の器具本体２内の容積を大きくすることができる。
なお、第６の実施の形態では透光部材２の内側表面を平らにしたが、これに限定されず他の形状を有するものでもよく、また内側表面がランプ１０の直射光の全てを入射させる形状や、一部のみを入射させる形状でもよい。
【００２６】
また、第６の実施の形態は透光部材２の外側表面を凹設してその外側表面に内側から入射する特定の直射光を全反射する点に特徴があるので、透光部材２の形状は第１の実施の形態ないし第４の実施の形態でもよく、これらの各実施の形態に適用することができる。
【００２７】
【発明の効果】
請求項１の照明器具によれば、透光部材によりランプ破損時の破片の外部への飛散が防止できる。また、ランプの直射光の器具光軸に対する交差角が反射部材の反射光の最大交差角以上の光は透光部材を全反射するのでグレアカットされる。また反射部材の反射光は最大交差角以下であるためすべて透光部材を透過する。したがって、直射光が反射部材の反射光の照射パターン外に照射されないので、美しい照射パターンが可能になる。さらに従来例と比較して部品点数を削減できコストダウンを図れるとともに、透光部材を保持する構造のみ備えてグレアカットのための保持構造は不要であるので構造が簡単で器具が小型化できる。
【００２９】
請求項２の照明器具によれば、器具光軸に対して最大交差角以上の交差角をもつ発光部の後端からの直射光は透光部材を全反射するためグレアカットされ、器具光軸に対して最大交差角以上の交差角をもつ発光部の先端からの直射光は不透過部および透光部材の全反射によりグレアカットされる。このように、発光部の先端および後端からの最大交差角の直射光で囲まれた光束をグレアカットするようにリング状の不透過部を形成したため、透光部材に入射する最大交差角の直射光に対して臨界角をなさない透過部材の中央部の形状を大きくすることができるとともに、器具光軸の方向の高さを低くすることができ、このため透光部材とランプとの間の距離を大きくすることができるので透光部材の温度を低減することができ、また透光部材の内側の器具本体内の容積を大きくすることができるのでランプ封止部や灯具外郭の温度の低減が可能となる。
さらに透光部材に不透過部を一体形成したため、従来例と比較して部品点数を削減できコストダウンを図れるとともに、グレアカット部の表面積を小さくできるため器具効率がアップする。その他、請求項１と同様な効果がある。
【００３０】
請求項３の照明器具によれば、請求項１または請求項２と同様な効果がある。
【図面の簡単な説明】
【図１】この発明の第１の実施の形態の一部破断側面図である。
【図２】第２の実施の形態の一部破断側面図である。
【図３】第３の実施の形態の一部破断側面図である。
【図４】第４の実施の形態の一部破断側面図である。
【図５】第５の実施の形態の一部破断側面図である。
【図６】第６の実施の形態の一部破断側面図である。
【図７】従来例の略半断面側面図である。
【図８】他の従来例の略半断面側面図である。
【符号の説明】
１器具本体
２透光部材
２ａ外側表面
３開口
５ランプソケット
１０ランプ
１０ａ発光部であるフィラメント
１３反射部材であるダイクールミラー
２１不透過部
Ｈ器具光軸
θ 最大交差角[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lighting fixture.
[0002]
[Prior art]
There have been luminaires having a protector on the front surface in order to cut off ultraviolet rays from the lamp, to prevent fragments from scattering to the outside when the lamp is broken, and to protect the high heat part of the lamp.
On the other hand, since the luminaire using a lamp that becomes hot when turned on is an open bottom surface, there is a possibility that a hand or an object may touch the lamp or the reflector directly. Also, in the unlikely event that the lamp breaks, the fragments of the lamp are scattered. For this reason, it is necessary to provide a protector on the front surface even in the case of using a lamp that becomes hot when turned on.
[0003]
A conventional example of this type is shown in FIG. That is, in this conventional example, a front glass 73 that closes the opening 72 of the instrument main body 71 is provided in the opening 72 so that a hand or an object does not directly touch the lamp 70 that is heated at the time of lighting, and ultraviolet rays are cut off. Yes. Reference numeral 74 denotes a lamp socket.
On the other hand, as shown in FIG. 8, a glare cut cover 75 is provided at the center of the opening 72 of the instrument main body 71 for glare cut so as to block the direct light from the lamp 70.
[0004]
[Problems to be solved by the invention]
However, when the glare cut cover 75 shown in FIG. 8 is provided in the opening 72 of the instrument main body 71 together with the front glass 73 as the protector shown in FIG. 7, the structure becomes complicated, the instrument becomes large, and the number of parts increases. There was a drawback of doing.
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lighting apparatus that can reduce the number of parts, simplify the structure, and reduce the size.
[0005]
[Means for Solving the Problems]
The lighting apparatus according to claim 1, wherein the lighting apparatus has an opening, a lamp socket at the back of the opening, and a reflection member having a reflection opening that reflects the light of the lamp mounted on the lamp socket forward, and A translucent member provided in the instrument body so as to close the opening of the instrument body,
The acute angle at which the reflected light of the light incident from the tip of the lamp filament of the lamp to the opening end of the reflecting member intersects the instrument optical axis passing through the lamp filament and the opening center of the reflecting member is maximized. When the crossing angle is set, the incident angle becomes a critical angle with respect to the direct light of the lamp that is incident on the translucent member at an intersecting acute angle equal to or greater than the maximum crossing angle, and the light transmissivity is smaller than the maximum crossing angle. The shape of the translucent member is set such that the incident angle becomes smaller than the critical angle with respect to the reflected light of the reflecting member incident on the member.
[0006]
According to the lighting device according to claim 1, Ru prevents scattering to the outside of the pieces during ramp damage by light transmitting member. Further, light whose crossing angle with respect to the instrument optical axis of the direct light of the lamp is greater than or equal to the maximum crossing angle of the reflected light of the reflecting member is totally reflected by the light transmitting member and thus is glare cut. Further, since the reflected light of the reflecting member is less than or equal to the maximum crossing angle, all the light is transmitted through the translucent member. Therefore, since direct light is not irradiated outside the irradiation pattern of the reflected light of the reflecting member, a beautiful irradiation pattern is possible. Furthermore, the number of parts can be reduced compared to the conventional example, and the cost can be reduced. Since only a structure for holding the light transmitting member is provided and no holding structure for glare cutting is required, the structure is simple and the device can be downsized.
[0009]
The lighting fixture according to claim 2 has an opening, a lamp socket at the back of the opening, and a reflection member that reflects forward the light of the light emitting portion extending in the direction of the fixture optical axis of the lamp mounted on the lamp socket. And a translucent member provided on the instrument body so that the top part faces the lamp and closes the opening. ,
With respect to the direct light from the rear end in the direction of the instrument optical axis of the light emitting unit incident on the light transmitting member at an intersection acute angle that is greater than or equal to the maximum intersection angle of the reflected light of the reflecting member with respect to the instrument optical axis, the incident angle is While setting the shape of the translucent member to be a critical angle,
An incident position where direct light from the tip of the light emitting part having the maximum crossing angle with respect to the instrument optical axis is incident on the translucent member is an inner peripheral end, and the maximum crossing angle with respect to the instrument optical axis A ring-shaped range having an incident position where the direct light from the rear end of the light emitting unit having the incident on the translucent member is an outer peripheral end is formed as the non-transparent portion of the translucent member at the top. The range closer to the center than the ring-shaped range is made transparent or non-transparent.
[0010]
According to the lighting fixture of claim 2 , the direct light from the rear end of the light emitting part having a crossing angle greater than or equal to the maximum crossing angle with respect to the fixture optical axis is glare cut to totally reflect the translucent member, and the fixture optical axis. On the other hand, direct light from the tip of the light emitting part having a crossing angle greater than or equal to the maximum crossing angle is glare cut by total reflection of the non-transmissive part and the translucent member. As described above, the ring-shaped non-transmissive portion is formed so as to glare-cut the light beam surrounded by the direct light having the maximum crossing angle from the front end and the rear end of the light emitting portion. The shape of the central part of the transmission member that does not form a critical angle with respect to direct light can be increased, and the height in the direction of the optical axis of the instrument can be reduced. Therefore, the temperature of the translucent member can be reduced, and the volume inside the fixture body inside the translucent member can be increased. Reduction is possible.
Furthermore, since the opaque portion is integrally formed with the translucent member, the number of parts can be reduced and the cost can be reduced as compared with the conventional example, and the surface area of the glare cut portion can be reduced, so that the instrument efficiency is increased. In addition, there are the same effects as in the first aspect .
[0011]
According to a third aspect of the present invention, in the lighting device according to the first or second aspect, the shape of the translucent member is incident on the translucent member at an acute angle greater than a maximum crossing angle with respect to the instrument optical axis of the reflected light of the reflective member. The outer surface of the translucent member is recessed so that the direct light of the lamp is totally reflected on the outer surface of the translucent member.
According to the lighting fixture of Claim 3, there exists an effect similar to Claim 1 or Claim 2.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of the present invention will be described with reference to FIG. That is, this lighting fixture has the fixture main body 1 and the translucent member 2 as a protector.
The appliance main body 1 has an opening 3 and a lamp socket 5 behind the opening 3. In the embodiment, the instrument body 1 is provided with an arm 6 at the upper end, and a flange 6a at the upper end of the arm 6 is attached to a ceiling (not shown). A lamp socket 5 is attached to the instrument body 1, a cylindrical shade 7 is arranged in front of the lamp socket 5, and is integrally attached to the instrument body 1 with screws 8, and a protector mounting frame 18 is attached to the front end of the shade 7. . A substantially cylindrical infrared reflecting plate 11 surrounding the lamp 10 mounted in the lamp socket 5 is attached to the shade 7 with a screw 12, and a Dycool mirror 13, which is a reflecting mirror, is used as a reflecting member inside the infrared reflecting plate 11. Inserted, the tip of the dichroic mirror 13 is passed through the lamp 10 and locked to the inner flange 14 of the socket side end of the infrared reflector 11, and the circumference formed on the inner periphery of the inlet side end of the infrared reflector 11 A fixing ring 16 is fitted into the groove 15, and the die cool mirror 13 is pressed and fixed by the fixing ring 16. The lamp 10 uses a mini halogen lamp among the halogen lamps. Reference numeral 10a denotes a filament (elliptical arc tube) which is a light emitting portion extending in the direction of the instrument optical axis H. The dichroic mirror 13 reflects the light of the lamp 10 mounted on the lamp socket 5 forward, specifically, reflects substantially in parallel to the instrument optical axis H, and is located on the side surface and the back surface of the lamp 10.
[0013]
The translucent member 2 is provided in the instrument body 1 so as to integrally form a non-transparent portion 21 for glare cut of the lamp 10 attached to the lamp socket 5 so as to close the opening 3. In the embodiment, the translucent member 2 is a material that transmits light and does not transmit air. Specifically, the light-transmitting member 2 is formed of a tempered glass and has a substantially mountain-shaped cross section, that is, a substantially truncated cone shape in this embodiment. The upper end portion is recessed in a partial spherical shape, and a black coating or vapor deposition of a visible light reflecting film is performed on the surface to form an impermeable portion 21. The size of the non-transmissive portion 21 is a straight line L connecting the rear end of the filament 10a of the lamp 10 and the green portion of the opening 3 with the translucent member 2 attached to the fixture body 1 as shown in FIG. The intersecting position is determined to be the outermost periphery, ensuring a sure glare cut. Further, the lower end portion of the translucent member 2 forms an outer collar 22 and is placed on the lamp socket 5 side of the inner collar 19 formed on the inner periphery of the protector mounting frame 18. And it is stepped so that the inner peripheral side of the ring plate-shaped glass presser 23 is lowered, the outer collar 22 is pressed on the inner peripheral side, and the screw 17 with the spring 26 is passed through the screw insertion hole formed on the outer peripheral side. The translucent member 2 is elastically pressed and fixed to the inner collar 19 by the glass presser 23 by screwing into a screw hole formed in the protector mounting frame 18. The protector mounting frame 18 is formed with a collar on the outer periphery, a notch (not shown) through which the locking portion 7a of the shade 7 is inserted is formed in the collar, and the protector mounting frame 18 is inserted and rotated in a bayonet manner to rotate the collar. The protector attachment frame 18 is attached to the shade 7 by being engaged with the engagement portion 7a. In this case, the glass presser 23 is also formed with a notch through which the locking portion 7a is inserted. Alternatively, the glass presser 23 may be locked to the locking portion 7 a by omitting the collar and forming a notch through the locking portion 7 a in the glass presser 23.
[0014]
According to this embodiment, the translucent member 2 can prevent the fragments from being scattered to the outside when the lamp is broken, and the glare can be cut from the non-transparent portion 21. Furthermore, since the non-transparent portion 21 is integrally formed with the translucent member 2, the number of parts can be reduced and the cost can be reduced as compared with the conventional example, and the surface area of the glare cut portion can be reduced, so that the efficiency of the instrument is improved, and the translucent Since only the structure for holding the member 2 is provided and the holding structure for glare cutting is unnecessary, the structure is simple and the device can be downsized.
[0015]
A second embodiment of the present invention is shown in FIG. That is, in this lighting apparatus, in the first embodiment, the shape of the translucent member 2 is maximally intersected with the apparatus optical axis H of the lamp 10 out of the reflected light of the dichroic mirror 13 that is a reflecting member. against direct light L ₂ of the lamp 10 is incident to the translucent member 2 at the maximum crossing angle θ or more cross acute angle of the reflected light L ₁ which, as the incident angle to the surface of the light transmitting member 2 becomes critical angle It is set. Here, the maximum crossing angle θ refers to the crossing angle of the reflected light L ₁ from the tip of the lamp filament 10 a (the side close to the translucent member 2) to the opening end of the dichroic mirror 13 with respect to the instrument optical axis H. Moreover, although the translucent member 2 of embodiment forms the cross-sectional mountain shape in which both sides incline with the constant gradient with respect to the instrument optical axis H on the instrument optical axis H top part, the whole shape is formed in a substantially cone shape. is doing. Then, a portion where the incident angle of the direct light of the lamp 10 is equal to or smaller than the maximum crossing angle θ with respect to the translucent member 2, that is, a flat central top portion of the translucent member 2, is a non-transparent portion as in the first embodiment. 21 is provided.
[0016]
According to this embodiment, direct light L ₂ having a crossing angle with respect to the instrument optical axis H of the direct light of the lamp 10 equal to or greater than the maximum crossing angle θ of the reflected light of the dichroic mirror 13 is totally reflected by the translucent member 2. So it will be glare cut. Further, since the reflected light of the dichroic mirror 13 is equal to or less than the maximum crossing angle θ, all the light passes through the light transmitting member 2. Accordingly, since direct light is not irradiated outside the irradiation pattern of the reflected light of the dichroic mirror 13, a beautiful irradiation pattern is possible.
[0017]
Further, the non-transmissive portion 21 may be a small range as compared with the first embodiment. Other configurations and operational effects are the same as those of the first embodiment. The impermeable portion 21 may not be provided. If human sight facing the light-transmitting member 2 of the lighting fixture is less than θ maximum crossing angle, it means that the reflected light of die cool mirror 13 is visible, direct light from the maximum intersection angle θ less when the filament 10a This is because there is no need to glare cut. For example, it is effective if there is a structure that prevents the direct light from passing through the filament 10a, such as a squeezing, at the tip of the lamp 10.
[0018]
A third embodiment of the present invention is shown in FIG. That is, in this lighting apparatus, in the second embodiment, the inclined surface in the cross-sectional mountain shape of the translucent member 2 is formed in a concave shape with a cross-sectional shape, and the same conditions as in the second embodiment, that is, the tip of the filament 10a The incident angle of the direct light L _{2 having} a maximum crossing angle θ from the incident angle to the translucent member 2 is a constant angle that is not less than the critical angle. Therefore, the glare cut of the direct light from the lamp 10 is performed by the same operation as that of the second embodiment. Other configurations and operational effects are the same as those of the second embodiment.
[0019]
A fourth embodiment of the present invention is shown in FIG. That is, in this lighting fixture, in the second embodiment, the shape of the translucent member 2 is set to a cross acute angle that is equal to or greater than the maximum crossing angle θ of the reflected light of the dichroic mirror 13 that is the reflecting member 2 with respect to the fixture optical axis H. Thus, the incident angle is set to be a critical angle with respect to the direct light L ₃ from the rear end of the filament 10 a incident on the light transmitting member 2.
[0020]
Further, the incident position where the direct light L ₂ from the tip of the filament 10 a having the maximum crossing angle θ with respect to the instrument optical axis H enters the translucent member 2 is the inner peripheral end, and the direct light from the rear end of the filament 10 a. The opaque part 21 is formed in the transparent member 2 in a ring-shaped range having the incident position where L ₃ is incident on the transparent member 2 as an outer peripheral end. The opaque portion 21 is subjected to vapor deposition of a visible light reflecting film or black coating as in the first embodiment. Therefore, the shape of the translucent member 2 in this embodiment is a truncated cone shape whose inclination angle is substantially the same as that of the translucent member 2 of the second embodiment, but the shape of the top portion is large, and the axial direction is accordingly increased. The height is low. Further, the impermeable portion 21 is formed in a circular ring shape on the outer peripheral side of the top portion. Further, an opaque portion having the same configuration as that of the opaque portion 21 is also formed on the translucent member 2 inside the opaque portion 21, but the reason may not be the same as in the second embodiment. .
[0021]
According to this embodiment, the direct light L ₃ from the rear end of the filament 10a having a crossing angle greater than or equal to the maximum crossing angle θ with respect to the instrument optical axis H is glare cut to totally reflect the translucent member 2, Direct light L ₂ from the tip of the filament 10 a having a crossing angle equal to or greater than the maximum crossing angle θ with respect to the instrument optical axis H is glare cut by total reflection of the non-transmissive part 21 and the translucent member 2. Thus, since the ring-shaped non-transmissive portion 21 is formed so as to glare-cut the light beam surrounded by the direct light having the maximum crossing angle θ from the front end and the rear end of the filament 10a, the maximum incident light to the translucent member 2 is formed. The shape of the central portion of the transmitting member 2 that does not form a critical angle with respect to the direct light L ₂ and L _{3 having the} crossing angle θ can be increased, and the height in the direction of the instrument optical axis H can be decreased. For this reason, since the distance between the translucent member 2 and the lamp 10 can be increased, the temperature of the translucent member 2 can be reduced, and the volume in the instrument main body 1 inside the translucent member 2 can be reduced. Since the size can be increased, the temperature of the lamp sealing portion and the lamp casing can be reduced.
[0022]
The other configurations and the operational effects are the same as those of the third embodiment.
A fifth embodiment of the present invention is shown in FIG. That is, this lighting fixture is different from the fourth embodiment in that the shape of the inclined surface of the translucent member 2 is formed as a concave curved surface as in the third embodiment. Moreover, compared with 3rd Embodiment, while the shape of the top part of the translucent member 2 becomes large, height is low, and the impervious part 21 is formed in the outer periphery of a top part. The operational effects are the same as those of the third embodiment and the fourth embodiment, and the other configurations and operational effects are also the same as those of the third embodiment and the fourth embodiment.
[0023]
A sixth embodiment of the present invention is shown in FIG. That is, the fifth embodiment is different from the fifth embodiment in that the shape of the translucent member 2 is changed to the translucent member 2 at a crossing acute angle greater than or equal to the maximum crossing angle θ with respect to the instrument optical axis H of the reflected light L ₁ of the dichroic mirror 13. is direct light L ₃ from the rear end side of the filament 10a of the lamp 10 to be incident, it is that they are recessed outer surface 2a of the light transmitting member 2 so as to totally reflect at the outer surface 2a of the light transmitting member 2 . The specific shape is similar to the outer surface of the translucent member 2 of the fifth embodiment, and the inner surface is formed flat. Other configurations of the opaque portion 21 and the like are the same as those in the fourth and fifth embodiments.
[0024]
As described above, when the human line of sight is at a position equal to or smaller than the maximum crossing angle θ, the reflected light of the dichroic mirror 13 can be seen. Therefore, it is necessary to glare the direct light having the maximum crossing angle θ or more. According to this embodiment, all the light emitted from the translucent member 2 of the direct light L ₃ from the rear end of the filament 10a having the maximum crossing angle θ or more becomes an angle greater than the critical angle. The non-transparent portion 21 enables glare cutting, and therefore the same effect as that of the fifth embodiment can be obtained.
[0025]
Further, the inner surface of the translucent member 2 can be flattened, and when the inner surface is made flat in this way, the processing of the translucent member 2 is simplified and the direction of the instrument optical axis H of the translucent member 2 is simplified. Since the height can be shortened, the translucent member 2 can be further separated from the lamp 10 and the volume in the instrument body 2 inside the translucent member 2 can be increased.
In the sixth embodiment, the inner surface of the translucent member 2 is flattened. However, the present invention is not limited to this and may have other shapes, and the inner surface allows all of the direct light from the lamp 10 to enter. It may be a shape or a shape in which only a part is incident.
[0026]
In addition, the sixth embodiment is characterized in that the outer surface of the translucent member 2 is recessed and specific direct light incident on the outer surface from the inside is totally reflected. May be the first embodiment to the fourth embodiment, and can be applied to each of these embodiments.
[0027]
【The invention's effect】
According to the lighting device according to claim 1, Ru prevents scattering to the outside of the pieces during ramp damage by light transmitting member. Further, light whose crossing angle with respect to the instrument optical axis of the direct light of the lamp is greater than or equal to the maximum crossing angle of the reflected light of the reflecting member is totally reflected by the light transmitting member and thus is glare cut. Further, since the reflected light of the reflecting member is less than or equal to the maximum crossing angle, all the light is transmitted through the translucent member. Therefore, since direct light is not irradiated outside the irradiation pattern of the reflected light of the reflecting member, a beautiful irradiation pattern is possible. Furthermore, the number of parts can be reduced compared to the conventional example, and the cost can be reduced. Since only a structure for holding the light transmitting member is provided and no holding structure for glare cutting is required, the structure is simple and the device can be downsized.
[0029]
According to the lighting fixture of claim 2 , the direct light from the rear end of the light emitting part having a crossing angle greater than or equal to the maximum crossing angle with respect to the fixture optical axis is glare cut to totally reflect the translucent member, and the fixture optical axis. On the other hand, direct light from the tip of the light emitting part having a crossing angle greater than or equal to the maximum crossing angle is glare cut by total reflection of the non-transmissive part and the translucent member. As described above, the ring-shaped non-transmissive portion is formed so as to glare-cut the light beam surrounded by the direct light having the maximum crossing angle from the front end and the rear end of the light emitting portion. The shape of the central part of the transmission member that does not form a critical angle with respect to direct light can be increased, and the height in the direction of the optical axis of the instrument can be reduced. Therefore, the temperature of the translucent member can be reduced, and the volume inside the fixture body inside the translucent member can be increased. Reduction is possible.
Furthermore, since the opaque portion is integrally formed with the translucent member, the number of parts can be reduced and the cost can be reduced as compared with the conventional example, and the surface area of the glare cut portion can be reduced, so that the instrument efficiency is increased. In addition, there are the same effects as in the first aspect .
[0030]
According to the lighting fixture of Claim 3 , there exists an effect similar to Claim 1 or Claim 2 .
[Brief description of the drawings]
FIG. 1 is a partially cutaway side view of a first embodiment of the present invention.
FIG. 2 is a partially broken side view of a second embodiment.
FIG. 3 is a partially cutaway side view of a third embodiment.
FIG. 4 is a partially broken side view of a fourth embodiment.
FIG. 5 is a partially broken side view of a fifth embodiment.
FIG. 6 is a partially broken side view of a sixth embodiment.
FIG. 7 is a side view of a semi-cross section of a conventional example.
FIG. 8 is a schematic half sectional side view of another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Apparatus body 2 Translucent member 2a Outer surface 3 Opening 5 Lamp socket 10 Lamp 10a Filament 13 which is a light emission part Dycool mirror 21 which is a reflecting member Non-transmission part H Instrument optical axis θ Maximum crossing angle

Claims

An instrument body having an opening, a lamp socket at the back of the opening, and a reflection member having a reflection opening for reflecting the light of the lamp mounted in the lamp socket forward, and so as to block the opening of the instrument body A translucent member provided on the instrument body,
The acute angle at which the reflected light of the light incident from the tip of the lamp filament of the lamp to the opening end of the reflecting member intersects the instrument optical axis passing through the lamp filament and the opening center of the reflecting member is maximized. When the crossing angle is set, the incident angle becomes a critical angle with respect to the direct light of the lamp that is incident on the translucent member at an intersecting acute angle equal to or greater than the maximum crossing angle, and the light transmissivity is smaller than the maximum crossing angle. The lighting device, wherein the shape of the translucent member is set so that an incident angle becomes smaller than the critical angle with respect to the reflected light of the reflecting member incident on the member.

An instrument body having a reflective member for reflecting forward the light of the light emitting part extending in the direction of the instrument optical axis of the lamp mounted in the lamp socket and having a lamp socket at the back of the opening; A translucent member provided in the instrument body so as to have a sloped surface with a flat top and the top facing the lamp and closing the opening;
With respect to the direct light from the rear end in the direction of the instrument optical axis of the light emitting unit incident on the light transmitting member at an intersection acute angle that is greater than or equal to the maximum intersection angle of the reflected light of the reflecting member with respect to the instrument optical axis, the incident angle is While setting the shape of the translucent member to be a critical angle,
An incident position where direct light from the tip of the light emitting part having the maximum crossing angle with respect to the instrument optical axis is incident on the translucent member is an inner peripheral end, and the maximum crossing angle with respect to the instrument optical axis A ring-shaped range having an incident position where the direct light from the rear end of the light emitting unit having the incident on the translucent member is an outer peripheral end is formed as the non-transparent portion of the translucent member at the top. The lighting fixture which made the range of the center side rather than the said ring-shaped range transparent or non-transmissive.

The shape of the translucent member is such that direct light incident on the translucent member is incident on the outer surface of the translucent member at an acute angle greater than the maximum crossing angle of the reflected light of the reflective member with respect to the instrument optical axis. The lighting fixture according to claim 1, wherein an outer surface of the translucent member is recessed so as to be reflected.