JP7049769B2 - Sensor for automatic door open / close control - Google Patents

Sensor for automatic door open / close control Download PDF

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JP7049769B2
JP7049769B2 JP2017030699A JP2017030699A JP7049769B2 JP 7049769 B2 JP7049769 B2 JP 7049769B2 JP 2017030699 A JP2017030699 A JP 2017030699A JP 2017030699 A JP2017030699 A JP 2017030699A JP 7049769 B2 JP7049769 B2 JP 7049769B2
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博樹 野崎
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株式会社本田電子技研
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本発明は、発光部と受光部とを含む自動ドア開閉制御用センサに関し、さらに詳しく言えば、その発光部に用いられる赤外線発光ダイオードに関するものである。 The present invention relates to an automatic door open / close control sensor including a light emitting unit and a light receiving unit, and more specifically to an infrared light emitting diode used in the light emitting unit.

赤外線による自動ドア開閉制御用センサは、基本的な構成として、自動ドア近傍の監視領域（床面）に向けて赤外線を照射する発光部と、監視領域からの反射光を受光する受光部とを含み、受光部の受光量の変化に基づいて自動ドアを通過する人体を検知してドアエンジンを駆動する（例えば、特許文献１参照）。 The sensor for controlling automatic door opening / closing by infrared has a light emitting part that irradiates infrared rays toward the monitoring area (floor surface) near the automatic door and a light receiving part that receives reflected light from the monitoring area. Including, the door engine is driven by detecting a human body passing through an automatic door based on a change in the amount of light received by the light receiving unit (see, for example, Patent Document 1).

発光素子には赤外線発光ダイオード（ＬＥＤ）が用いられるが、監視領域に複数の検出スポットを形成するため、通常、複数の赤外線発光ダイオードと分割レンズの組合せが採用される。 An infrared light emitting diode (LED) is used as the light emitting element, but in order to form a plurality of detection spots in the monitoring area, a combination of a plurality of infrared light emitting diodes and a split lens is usually adopted.

引き戸式ドアの開閉方向を列として、その１列に１２スポットを含ませるには、例えば３素子×４分割レンズの組合せが採用される。この検出スポット列は、通常、ドア踏み込み方向に沿って多列として配置される。例えば、その多列が６列であるとすると、発光部には３素子×６列分＝１８個の赤外線発光ダイオードが設けられることになる。 In order to set the opening / closing direction of the sliding door as a row and include 12 spots in the row, for example, a combination of 3 elements × 4 split lenses is adopted. This detection spot row is usually arranged as a multi-row along the door stepping direction. For example, assuming that the multi-row is 6 rows, the light emitting unit is provided with 3 elements × 6 rows = 18 infrared light emitting diodes.

ところで、自動ドア開閉制御用センサの分野において、赤外線発光ダイオードには、リードフレームにて支持されているＬＥＤ素子を封止樹脂のレンズ体で封止してなり、そのレンズ体の形状が砲弾型である赤外線発光ダイオードが用いられる（例えば、特許文献２参照）。 By the way, in the field of sensors for automatic door open / close control, an infrared light emitting diode is formed by sealing an LED element supported by a lead frame with a lens body of a sealing resin, and the shape of the lens body is a bullet type. Infrared light emitting diode is used (see, for example, Patent Document 2).

特開２０１４－０３８０１９号公報Japanese Unexamined Patent Publication No. 2014-038019 特開２０１４－０３８０１９号公報Japanese Unexamined Patent Publication No. 2014-038019

砲弾型の赤外線発光ダイオードの発光面側から見た平面視はほぼ円形であるため、砲弾型の赤外線発光ダイオードを発光部の基板上に、例えば上記のように３素子×６列分＝１８個並べるには、それに見合った広いスペースを必要とする。 Since the plan view of the bullet-shaped infrared light emitting diode from the light emitting surface side is almost circular, the bullet-shaped infrared light emitting diode is placed on the substrate of the light emitting part, for example, 3 elements x 6 rows = 18 pieces as described above. To line up, you need a large space to match it.

この種の自動ドア開閉制御用センサは、自動ドアの無目もしくは天井面に取り付けられるが、余り目立たないように小型化が要望されている。他方において、素子数を増やして検出感度を高めたいという要望もある。 This type of automatic door open / close control sensor is attached to a transom light or a ceiling surface of an automatic door, but there is a demand for miniaturization so that it is not so noticeable. On the other hand, there is also a desire to increase the number of elements to increase the detection sensitivity.

そこで、本発明の課題は、自動ドア開閉制御用センサにおいて、発光部の基板上に発光素子（赤外線発光ダイオード）を実装（搭載）するにあたって、その実装スペースの省スペース化、もしくは決められた実装スペース内への素子搭載数の多数個化がはかれる赤外線発光ダイオードを提供することにある。 Therefore, an object of the present invention is to save space for mounting (mounting) a light emitting element (infrared light emitting diode) on a substrate of a light emitting unit in an automatic door open / close control sensor, or to perform a predetermined mounting. It is an object of the present invention to provide an infrared light emitting diode that can increase the number of mounted elements in a space.

上記課題を解決するため、本発明は、監視領域に向けて赤外線を照射する発光部と、上記監視領域からの反射光を受光する受光部とを含み、上記発光部にリードフレームにて支持されているＬＥＤ素子を封止樹脂のレンズ体で封止してなる赤外線発光ダイオードが用いられている自動ドア開閉制御用センサにおいて、
上記レンズ体の発光面はトーリックレンズの凸曲面であり、上記発光面の投影図形が短辺と長辺のアスペクト比が１．６～２．２の矩形であり、上記レンズ体を構成する封止樹脂には、その樹脂量に対し体積比で２～２０％の拡散剤が混合されており、上記拡散剤として球状でかつ屈折率が１．３～１．８である無機化合物が用いられ、上記レンズ体を構成する封止樹脂が熱硬化性樹脂からなり、上記無機化合物として金属酸化物および／または金属水酸化物が用いられ、上記赤外線発光ダイオードの指向半値角が±５０度以上であることを特徴としている。
In order to solve the above problems, the present invention includes a light emitting unit that irradiates infrared rays toward the monitoring region and a light receiving unit that receives the reflected light from the monitoring region, and is supported by the light emitting unit by a lead frame. In an automatic door open / close control sensor that uses an infrared light emitting diode in which the LED element is sealed with a lens body made of a sealing resin.
The light emitting surface of the lens body is a convex curved surface of a toric lens , and the projected figure of the light emitting surface is a rectangle having an aspect ratio of a short side and a long side of 1.6 to 2.2. A diffusing agent having a volume ratio of 2 to 20% with respect to the amount of the resin is mixed in the stop resin, and an inorganic compound having a spherical shape and a refractive index of 1.3 to 1.8 is used as the diffusing agent. The sealing resin constituting the lens body is made of a thermosetting resin, a metal oxide and / or a metal hydroxide is used as the inorganic compound, and the directional half-value angle of the infrared light emitting diode is ± 50 degrees or more. It is characterized by being.

本発明によれば、発光部に搭載される赤外線発光ダイオードとして、従来のように砲弾型ではなく、ＬＥＤ素子を封止するレンズ体の発光面が蒲鉾状の凸曲面であり、その発光面の投影図形（平面視図形）が短辺と長辺を含む矩形である赤外線発光ダイオードを用いることにより、発光部の基板上に赤外線発光ダイオードを実装（搭載）するにあたって、その実装スペースの省スペース化をはかることができる。 According to the present invention, the infrared light emitting diode mounted on the light emitting portion is not a bullet type as in the conventional case, but the light emitting surface of the lens body that encloses the LED element is a hump-shaped convex curved surface, and the light emitting surface thereof. By using an infrared light emitting diode whose projected figure (plan view figure) is a rectangle including a short side and a long side, the mounting space can be saved when mounting (mounting) the infrared light emitting diode on the substrate of the light emitting part. Can be measured.

また、レンズ体に拡散剤を入れて指向半値角を±５０度以上とすることにより、赤外線発光ダイオードの設置スペースが狭くても動作感度を高めることができる。 Further, by adding a diffusing agent to the lens body and setting the directional half-value angle to ± 50 degrees or more, the operating sensitivity can be improved even if the installation space of the infrared light emitting diode is narrow.

本発明の実施形態に係る自動ドア開閉制御用センサが備える（ａ）発光部の構成を示す模式図、（ｂ）受光部の構成を示す模式図および（ｃ）上記発光部での赤外線発光ダイオードの配列の一例を示す模式図。A schematic diagram showing (a) a configuration of a light emitting unit, (b) a schematic diagram showing a configuration of a light receiving unit, and (c) an infrared light emitting diode in the light emitting unit included in the sensor for controlling automatic door opening / closing according to an embodiment of the present invention. The schematic diagram which shows an example of the arrangement of. 上記発光部に適用される赤外線発光ダイオードの（ａ）正面図、（ｂ）側面図および（ｃ）平面図。(A) front view, (b) side view and (c) plan view of the infrared light emitting diode applied to the light emitting portion. （ａ）レンズ体に拡散剤を含ませたときの拡散半値角を示すグラフ、（ｂ）その比較例としてレンズ体に拡散剤を含ませないときの拡散半値角を示すグラフ。(A) A graph showing a diffusion half-value angle when the lens body contains a diffuser, and (b) a graph showing a diffusion half-value angle when the lens body does not contain a diffuser as a comparative example.

次に、図１ないし図３を参照して、本発明の実施形態について説明するが、本発明はこれに限定されるものではない。 Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 3, but the present invention is not limited thereto.

本発明の実施形態に係る自動ドア開閉制御用センサは、図１（ａ）に示す発光部１と、図１（ｂ）に示す受光部２とを備えている。なお、発光部１と受光部２はペアとして図示しない筐体内に組み込まれ、同じく図示しない自動ドアの無目もしくはその天井付近に設置される。 The automatic door open / close control sensor according to the embodiment of the present invention includes a light emitting unit 1 shown in FIG. 1 (a) and a light receiving unit 2 shown in FIG. 1 (b). The light emitting unit 1 and the light receiving unit 2 are incorporated as a pair in a housing (not shown), and are also installed in a transom light of an automatic door (not shown) or near the ceiling thereof.

発光部１は、基本的な構成として、発光素子としての赤外線発光ダイオード（以下、発光ダイオードと略記することがある）１０と、投光レンズ１５とを備えている。 The light emitting unit 1 includes an infrared light emitting diode (hereinafter, may be abbreviated as a light emitting diode) 10 as a light emitting element and a light emitting lens 15 as a basic configuration.

この実施形態において、発光ダイオード１０として３つの発光ダイオード１０ａ，１０ｂ，１０ｃが用いられている。これら発光ダイオード１０ａ，１０ｂ，１０ｃは、発光部１内の基板１３に実装（搭載）されている。なお、これら発光ダイオード１０ａ，１０ｂ，１０ｃは同一構成であり、特に区別する必要がない場合には、総称として発光ダイオード１０という。 In this embodiment, three light emitting diodes 10a, 10b, and 10c are used as the light emitting diode 10. These light emitting diodes 10a, 10b, and 10c are mounted (mounted) on the substrate 13 in the light emitting unit 1. The light emitting diodes 10a, 10b, and 10c have the same configuration, and are collectively referred to as light emitting diodes 10 when it is not necessary to distinguish them.

また、投光レンズ１５には、４分割レンズ１５ａが用いられている。したがって、発光ダイオード１０ａ，１０ｂ，１０ｃから４分割レンズ１５ａを通して監視領域としての図示しない自動ドア近傍の床面に向けて１２スポットの赤外光が照射される。 Further, a quadrant lens 15a is used for the floodlight lens 15. Therefore, 12 spots of infrared light are emitted from the light emitting diodes 10a, 10b, and 10c through the 4-split lens 15a toward the floor surface near the automatic door (not shown) as a monitoring region.

受光部２は、基本的な構成として、受光素子としてのフォトダイオード２０と、受光レンズ２５とを備えている。この実施形態によると、フォトダイオード２０には３つのフォトダイオード２０ａ，２０ｂ，２０ｃが用いられ、これらフォトダイオード２０ａ，２０ｂ，２０ｃは、受光部２内の基板２３に実装（搭載）されている。 The light receiving unit 2 includes a photodiode 20 as a light receiving element and a light receiving lens 25 as a basic configuration. According to this embodiment, three photodiodes 20a, 20b, 20c are used for the photodiode 20, and these photodiodes 20a, 20b, 20c are mounted (mounted) on the substrate 23 in the light receiving unit 2.

床面からの１２スポットの反射光を３つのフォトダイオード２０ａ，２０ｂ，２０ｃで受光するため、受光レンズ２５には４分割レンズ２５ａが用いられている。 In order to receive the reflected light of 12 spots from the floor surface by the three photodiodes 20a, 20b, 20c, a quadrant lens 25a is used as the light receiving lens 25.

この実施形態では、発光部１と受光部２ともに３素子×４分割レンズとしているが、素子数とレンズの分割数は必ずしも一致させる必要はなく、１２スポット光の場合について言えば、発光部１もしくは受光部２を例えば４素子×３分割レンズとしてもよい。 In this embodiment, both the light emitting unit 1 and the light receiving unit 2 are 3 elements × 4 divided lenses, but the number of elements and the number of divided lenses do not necessarily have to match, and in the case of 12-spot light, the light emitting unit 1 Alternatively, the light receiving unit 2 may be, for example, a 4-element × 3-split lens.

本発明において重要なのは発光部１に用いられる発光ダイオード１０で、受光部２のフォトダイオード２０は従来より用いられているフォトダイオードであってよい。 What is important in the present invention is the light emitting diode 10 used in the light emitting unit 1, and the photodiode 20 in the light receiving unit 2 may be a photodiode that has been conventionally used.

図２（ａ）～（ｃ）を参照して、発光ダイオード１０は、カソード側フレーム１１１とアノード側フレーム１１２を含むリードフレーム１１０と、リードフレーム１１０に支持されるＬＥＤ素子１２０と、ＬＥＤ素子１２０が埋没されるようにＬＥＤ素子１２０を封止する封止樹脂からなるレンズ体１３０とを備えている。ＬＥＤ素子１２０には、ＧａＡｓ，ＧａＡｌＡｓ等の化合物半導体が用いられてよい。 With reference to FIGS. 2A to 2C, the light emitting diode 10 includes a lead frame 110 including a cathode side frame 111 and an anode side frame 112, an LED element 120 supported by the lead frame 110, and an LED element 120. It is provided with a lens body 130 made of a sealing resin that seals the LED element 120 so that the LED element 120 is buried. A compound semiconductor such as GaAs or GaAlAs may be used for the LED element 120.

本発明において、レンズ体１３０の発光面（頂面）１３１は、図２（ｂ）の側面図に示すように、蒲鉾状の凸曲面であり、図２（ｃ）の平面図に示すように、発光面１３１の投影図形（平面視図形）は短辺Ｓと長辺Ｌを含む矩形であり、従来の砲弾型とは異なる。 In the present invention, the light emitting surface (top surface) 131 of the lens body 130 is a ridge-shaped convex curved surface as shown in the side view of FIG. 2 (b), and is as shown in the plan view of FIG. 2 (c). The projected figure (plan-view figure) of the light emitting surface 131 is a rectangle including a short side S and a long side L, and is different from the conventional bullet type.

このようにレンズ体１３０を矩形状とすることにより、図１（ｃ）に示すように、発光ダイオード１０を隙間なく密に配置することができる。これにより、基板１３の限られたスペース内により多くの発光ダイオード１０を搭載することができる。 By making the lens body 130 rectangular in this way, as shown in FIG. 1 (c), the light emitting diodes 10 can be densely arranged without gaps. As a result, more light emitting diodes 10 can be mounted in the limited space of the substrate 13.

本発明において、好ましい短辺Ｓと長辺Ｌの比（アスペクト比）は１．６～２．２である。アスペクト比が１．６未満の場合には高密度実装が困難で、通常の砲弾型と効果上の差が少なく好ましくない。また、アスペクト比が２．２を超えると、製造コストが大幅に高くなるので好ましくない。 In the present invention, the preferable ratio (aspect ratio) between the short side S and the long side L is 1.6 to 2.2. When the aspect ratio is less than 1.6, it is difficult to mount at high density, and the difference in effect from the normal cannonball type is small, which is not preferable. Further, if the aspect ratio exceeds 2.2, the manufacturing cost becomes significantly high, which is not preferable.

レンズ体１３０を構成する封止樹脂に対して拡散剤（光拡散剤）を含有させることにより、発光ダイオード１０の指向半値角を調整することができる。 By including a diffusing agent (light diffusing agent) in the sealing resin constituting the lens body 130, the directional half-value angle of the light emitting diode 10 can be adjusted.

一例として、図３（ａ）のグラフに、封止樹脂に拡散剤を含有させて指向半値角を±５５゜とした例を示す。比較例として、図３（ｂ）に拡散剤を含有させないときの指向半値角のグラフを示す。この比較例の指向半値角は±４１゜である。 As an example, the graph of FIG. 3A shows an example in which the sealing resin contains a diffusing agent and the directional half-value angle is ± 55 °. As a comparative example, FIG. 3B shows a graph of the directional half-value angle when the diffusing agent is not contained. The directional half-value angle of this comparative example is ± 41 °.

なお、指向半値角とは、発光ダイオードの中心軸（光軸）における光の強度に対し、相対的に光の強度が５０％に半減する方向の内角を言う。中心軸を０゜として、例えば±５５゜と表される（１１０゜と表される場合もある）。 The directional half-value angle refers to an internal angle in a direction in which the light intensity is halved to 50% of the light intensity on the central axis (optical axis) of the light emitting diode. With the central axis as 0 °, it is expressed as ± 55 ° (sometimes expressed as 110 °).

本発明において、発光ダイオード１０の好ましい指向半値角は±５０゜以上、より好ましくは±６０゜以上である。これにより、発光ダイオード１０の設置スペースが狭くても動作感度を高めることができる。 In the present invention, the preferred half-value angle of the light emitting diode 10 is ± 50 ° or more, more preferably ± 60 ° or more. As a result, the operating sensitivity can be improved even if the installation space of the light emitting diode 10 is small.

指向半値角を±５０゜以上とするにあたって、封止樹脂に対する拡散剤の好ましい含有量は体積比で１～５０ｖｏｌ％、より好ましくは２～２０ｖｏｌ％である。 When the directional half-value angle is ± 50 ° or more, the content of the diffusing agent with respect to the sealing resin is preferably 1 to 50 vol%, more preferably 2 to 20 vol% in terms of volume ratio.

レンズ体１３０を構成する封止樹脂は熱硬化性樹脂が好ましいが、赤外線を遮蔽、遮断しない樹脂を選ぶ必要がある。密着性が高い理由から、エポキシ樹脂、フェノール樹脂、尿素樹脂、メラミン樹脂、不飽和ポリエステル樹脂もしくはケイ素樹脂等が好ましく採用される。中でも、エポキシ樹脂、ケイ素樹脂が好ましい。 The sealing resin constituting the lens body 130 is preferably a thermosetting resin, but it is necessary to select a resin that does not shield or block infrared rays. Epoxy resin, phenol resin, urea resin, melamine resin, unsaturated polyester resin, silicon resin and the like are preferably used because of their high adhesion. Of these, epoxy resin and silicon resin are preferable.

拡散剤には無機化合物が用いられる。使用する無機化合物には、金属酸化物、金属水酸化物、炭酸塩、硫酸塩等が挙げられる。安定性と価格から金属酸化物が好ましい。 Inorganic compounds are used as the diffuser. Examples of the inorganic compound used include metal oxides, metal hydroxides, carbonates and sulfates. Metal oxides are preferred for stability and price.

金属酸化物には、酸化アルミニウム、酸化マグネシウム、酸化チタン、酸化亜鉛、二酸化ケイ素、酸化ジルコニウム等がある。 Metal oxides include aluminum oxide, magnesium oxide, titanium oxide, zinc oxide, silicon dioxide, zirconium oxide and the like.

金属水酸化物には、水酸化アルミニウム、水酸化カルシウム、水酸化マグネシウム等がある。 Metal hydroxides include aluminum hydroxide, calcium hydroxide, magnesium hydroxide and the like.

炭酸塩には、炭酸カルシウム（軽質炭酸カルシウム、重質炭酸カルシウム、極微細炭酸カルシウム等）、炭酸バリウム、炭酸マグネシウム、炭酸ストロンチウム等がある。 Calcium carbonate includes calcium carbonate (light calcium carbonate, heavy calcium carbonate, ultrafine calcium carbonate, etc.), barium carbonate, magnesium carbonate, strontium carbonate, and the like.

硫酸塩には、硫酸カルシウム、硫酸バリウム等がある。 Sulfates include calcium sulfate, barium sulfate and the like.

これ以外のその他の候補として、カルシウムカーボネート、方解石、大理石、石膏、カリオンクレー、焼成クレー、タルク、セリサイト、光学ガラス、ガラスビーズ等が挙げられる。 Other candidates include calcium carbonate, calcite, marble, gypsum, carion clay, calcined clay, talc, sericite, optical glass, glass beads and the like.

上記に挙げた中でも、熱硬化性樹脂との親和性が良いことから、酸化アルミニウム、二酸化ケイ素、水酸化アルミニウムが特に好ましい。また、上記した無機化合物粒子は２種類以上が併用されてもよい。 Among the above, aluminum oxide, silicon dioxide, and aluminum hydroxide are particularly preferable because they have good affinity with thermosetting resins. Further, two or more kinds of the above-mentioned inorganic compound particles may be used in combination.

上記無機化合物粒子の形状は特に限定されず、例えば球状、多面体状（４面体状、８面体状、１２面体状、２０面体状等）、立方体状、表面に凹凸もしくは凸状の突起を複数有する形状（金平糖のような形状）、板状、針状等であってよい。 The shape of the inorganic compound particles is not particularly limited, and has, for example, a spherical shape, a polyhedral shape (tetrahedron, octahedron, dodecahedron, icosahedron, etc.), a cube, and a plurality of uneven or convex protrusions on the surface. It may have a shape (a shape like konpeito), a plate shape, a needle shape, or the like.

これら形状のうち、断熱性に優れる理由から、球状、多面体状、立方体状、金平糖状が好ましいが、入手しやすく、断熱性にも優れている球状が特に好ましい。 Of these shapes, spherical, polyhedral, cubic, and konpeito-like shapes are preferable because of their excellent heat insulating properties, but spherical shapes that are easily available and have excellent heat insulating properties are particularly preferable.

また、拡散剤として使用する無機化合物の屈折率は、正反射率および拡散反射率がより良好となる理由から１．３～１．８が好ましい。 The refractive index of the inorganic compound used as the diffuser is preferably 1.3 to 1.8 because the specular reflectance and the diffuse reflectance are better.

このように屈折率１．３～１．８を満たす無機化合物粒子としては、酸化アルミニウム、酸化マグネシウム、水酸化アルミニウム、水酸化カルシウム、水酸化マグネシウム、炭酸カルシウム、炭酸バリウム、炭酸マグネシウム、炭酸ストロンチウム、硫酸カルシウム、硫酸バリウム、大理石、石膏、カリオンクレー、タルク、セリサイト、光学ガラス、ガラスビーズ等が挙げられる。 Examples of the inorganic compound particles satisfying the refractive index of 1.3 to 1.8 include aluminum oxide, magnesium oxide, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, calcium carbonate, barium carbonate, magnesium carbonate, and strontium carbonate. Calcium sulfate, barium carbonate, marble, gypsum, carion clay, talc, sericite, optical glass, glass beads and the like can be mentioned.

上記したように、レンズ体１３０を構成する封止樹脂には熱硬化性樹脂が好ましく用いられ、熱硬化性樹脂に対する拡散剤としての無機化合物粒子の含有量（配合量）は、熱硬化性樹脂全量を１００として、体積比で１～５０ｖｏｌ％、好ましくは２～２０ｖｏｌ％であるが、無機化合物粒子の添加方法は、練り込み等であってよく特に限定されない。なお、レンズ体１３０の表面に無機化合物粒子を塗布する態様も本発明に含まれる。 As described above, a thermosetting resin is preferably used as the sealing resin constituting the lens body 130, and the content (blending amount) of the inorganic compound particles as a diffusing agent with respect to the thermosetting resin is determined by the thermosetting resin. The total amount is 100, and the volume ratio is 1 to 50 vol%, preferably 2 to 20 vol%, but the method of adding the inorganic compound particles may be kneading or the like and is not particularly limited. The present invention also includes an embodiment in which the inorganic compound particles are applied to the surface of the lens body 130.

１ 発光部
１０（１０ａ～１０ｃ） 赤外線発光ダイオード
１３ 基板
１５ 投光レンズ
１５ａ 分割レンズ
２ 受光部
２０（２０ａ～２０ｃ） フォトダイオード
２３ 基板
２５ 受光レンズ
２５ａ 分割レンズ
１１０ リードフレーム
１２０ ＬＥＤ素子
１３０ レンズ体
１３１ 発光面
1 Light emitting part 10 (10a to 10c) Infrared light emitting diode 13 Substrate 15 Floodlight lens 15a Split lens 2 Light receiving part 20 (20a to 20c) Photodiode 23 Board 25 Light receiving lens 25a Split lens 110 Lead frame 120 LED element 130 Lens body 131 Light emitting surface

Claims (1)

監視領域に向けて赤外線を照射する発光部と、上記監視領域からの反射光を受光する受光部とを含み、上記発光部にリードフレームにて支持されているＬＥＤ素子を封止樹脂のレンズ体で封止してなる赤外線発光ダイオードが用いられている自動ドア開閉制御用センサにおいて、
上記レンズ体の発光面はトーリックレンズの凸曲面であり、
上記発光面の投影図形が短辺と長辺のアスペクト比が１．６～２．２の矩形であり、
上記レンズ体を構成する封止樹脂には、その樹脂量に対し体積比で２～２０％の拡散剤が混合されており、
上記拡散剤として球状でかつ屈折率が１．３～１．８である無機化合物が用いられ、
上記レンズ体を構成する封止樹脂が熱硬化性樹脂からなり、上記無機化合物として金属酸化物および／または金属水酸化物が用いられ、
上記赤外線発光ダイオードの指向半値角が±５０度以上であることを特徴とする自動ドア開閉制御用センサ。 A lens body made of a resin that includes a light emitting part that irradiates infrared rays toward the monitoring area and a light receiving part that receives reflected light from the monitoring area, and an LED element supported by the lead frame in the light emitting part. In an automatic door open / close control sensor that uses an infrared light emitting diode sealed with
The light emitting surface of the lens body is a convex curved surface of a toric lens .
The projected figure of the light emitting surface is a rectangle having an aspect ratio of 1.6 to 2.2 on the short side and the long side.
The sealing resin constituting the lens body is mixed with a diffusing agent having a volume ratio of 2 to 20% with respect to the amount of the resin.
As the diffusing agent, an inorganic compound having a spherical shape and a refractive index of 1.3 to 1.8 is used.
The sealing resin constituting the lens body is made of a thermosetting resin, and a metal oxide and / or a metal hydroxide is used as the inorganic compound.
An automatic door open / close control sensor characterized in that the directional half-value angle of the infrared light emitting diode is ± 50 degrees or more.
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