JP2007059658A

JP2007059658A - Photo interrupter

Info

Publication number: JP2007059658A
Application number: JP2005243919A
Authority: JP
Inventors: Arata Shimozawa; 新下澤
Original assignee: Citizen Electronics Co Ltd
Current assignee: Citizen Electronics Co Ltd
Priority date: 2005-08-25
Filing date: 2005-08-25
Publication date: 2007-03-08

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface-mounted type photo interrupter capable of allowing a light emitted from a light-emitting section to be efficiently incident into a light-receiving section by covering a light transmissive resin bodies with a member having a light shielding or reflection function without gap, in a photo interrupter consisting of the light-emitting and light-receiving elements to be arranged on a substrate so as to be opposite to each other and the transmissive resin bodies for sealing the light-emitting and light receiving elements. <P>SOLUTION: The photo interrupter 21 consists of a light-emitting element 28 in which a light-emitting section 23 is mounted on a substrate 22, and a light transmissive resin body 30 on a light-emitting side which is used for sealing the light-emitting element 28, and also consists of a light-receiving element 40 in which a light-receiving section 23 is mounted on the substrate 22, and a light transmissive resin body 42 on a light-receiving side which is used for sealing the light-receiving element 40. The external peripheries of the light transmissive resin bodies 30, 42 on the light-emitting and light-receiving sides are covered with light-shielding resin bodies 31, 43 having external periphery extending portions 31a, 43a each extending downwardly from the top surface of the substrate 22. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、発光部と受光部とを基板上に対向して設け、その間の空間を被検出物が通過して光を遮ることにより、前記被検出物の有無や位置を検出する表面実装タイプのフォトインタラプタに関するものである。 The present invention provides a surface mounting type in which a light emitting unit and a light receiving unit are provided facing each other on a substrate, and the detected object passes through a space between the light detecting unit and blocks light to detect the presence or position of the detected object. This is related to the photo interrupter.

従来、この種のフォトインタラプタとしては、例えば特許文献１に記載のものが知られている。このフォトインタラプタ１は、図８に示すように、発光部２と、受光部３と、レンズ部４と、これらの発光部２、受光部３及びレンズ部４をその内部に収納して一体化させる遮光性のケース５とから構成されている。前記ケース５は、断面凹形状の溝部６を有する略立体形状であり、内部には前記発光部２、受光部３及びレンズ部４を収納する中空部が形成されている。また、前記溝部６の両側面には対向する位置にスリット状の出射部７と入射部８が形成されている。 Conventionally, as this type of photo-interrupter, for example, the one described in Patent Document 1 is known. As shown in FIG. 8, the photointerrupter 1 integrates a light emitting unit 2, a light receiving unit 3, a lens unit 4, and the light emitting unit 2, the light receiving unit 3 and the lens unit 4 contained therein. And a light-shielding case 5 to be made. The case 5 has a substantially three-dimensional shape having a groove portion 6 having a concave cross section, and a hollow portion for accommodating the light emitting portion 2, the light receiving portion 3 and the lens portion 4 is formed therein. In addition, slit-like emitting portions 7 and incident portions 8 are formed at opposite positions on both side surfaces of the groove portion 6.

一方、前記ケース５の中空部内に収納される発光部２及び受光部３は、それぞれがリードフレーム９，１０と、これらリードフレーム９，１０に搭載された発光素子１１又は受光素子１２と、これら発光素子１１及び受光素子１２を封止する透光樹脂体１３，１４とで構成され、発光部２の発光面１５と受光部３の受光面１６とが互いに向かい合うように配設されている。 On the other hand, the light emitting part 2 and the light receiving part 3 housed in the hollow part of the case 5 are respectively composed of the lead frames 9 and 10, the light emitting element 11 or the light receiving element 12 mounted on the lead frames 9 and 10, and these The light-emitting element 11 and the light-receiving element 12 are made up of light-transmitting resin bodies 13 and 14, and the light-emitting surface 15 of the light-emitting unit 2 and the light-receiving surface 16 of the light-receiving unit 3 are disposed so as to face each other.

このような構成からなる従来のフォトインタラプタ１にあっては、発光部２の発光面１５から出射された光はレンズ部４によって平行光に近づけられ、出射部７及び入射部８をすり抜けた光が受光面１６を通じて受光部３に入射される。このとき、ケース５の溝部６を被検出物が通過して光を遮ると、受光部３における受光量が変化するので、これによって位置検出を行なうことができる。 In the conventional photo interrupter 1 having such a configuration, the light emitted from the light emitting surface 15 of the light emitting unit 2 is made close to parallel light by the lens unit 4 and passes through the emitting unit 7 and the incident unit 8. Is incident on the light receiving unit 3 through the light receiving surface 16. At this time, if the object to be detected passes through the groove 6 of the case 5 and blocks the light, the amount of light received by the light receiving unit 3 changes, so that position detection can be performed.

また、近年の薄型化、小型化が進む電子機器に搭載可能な構成にするために、例えば、特許文献２に記載されているような表面実装タイプのフォトインタラプタが知られている。このタイプのフォトインタラプタは、前記フォトインタラプタ１のようなリードフレームを使用せず、基板の上面に発光素子及び受光素子を表面実装し、その上を樹脂材で封止した構造がとられている。
特開２００１−１３５８５２号公報特開平６−７７５１９号公報 For example, a surface mount type photo interrupter as described in Patent Document 2 is known in order to make it possible to be mounted on an electronic device that is becoming thinner and smaller in recent years. This type of photointerrupter does not use a lead frame like the photointerrupter 1, but has a structure in which a light emitting element and a light receiving element are surface-mounted on the upper surface of a substrate, and the top is sealed with a resin material. .
JP 2001-135852 A JP-A-6-77519

しかしながら、上記特許文献１に記載されているようなフォトインタラプタ１にあっては、発光部２の発光面１５と受光部３の受光面１６とが向かい合わせに配置され、発光部２の正面から出射した光の一部のみを直接出射部７からすり抜けさせる構造となっていることから、発光部２の正面から出射した光であっても出射部７の左右に拡散した光や発光部２の正面以外から出射された光が有効に利用されず、受光量が少なくなる。このため、被検出物の位置検出の信頼性に影響を及ぼすおそれがあった。 However, in the photointerrupter 1 as described in Patent Document 1, the light emitting surface 15 of the light emitting unit 2 and the light receiving surface 16 of the light receiving unit 3 are arranged face to face, and from the front of the light emitting unit 2. Since only a part of the emitted light passes through the emitting part 7 directly, even the light emitted from the front of the light emitting part 2 is diffused to the left and right of the emitting part 7 or the light emitting part 2 Light emitted from other than the front is not used effectively, and the amount of received light is reduced. For this reason, there is a possibility of affecting the reliability of the position detection of the detected object.

一方、上記特許文献２に記載されているような表面実装タイプのフォトインタラプタにあっては、表面実装された発光素子及び受光素子を放物面が形成された透光樹脂体と、この透光樹脂体の上方に設けられる遮光樹脂体とによって封止されていることから、前記発光素子から放出される光を受光側に向けて導くことができる。しかしながら、前記遮光樹脂体は、透光樹脂体を基板の上方で形成されるため、基板の平坦度が低く凹凸がある場合や、樹脂材を基板上に充填成形する際のバラツキ等によって、前記透光樹脂体と遮光樹脂体との境目に僅かな隙間が生じる場合がある。このような隙間が生じると、発光側の光が周囲に漏れ、受光素子は不要な外部光を検出するためにＳ／Ｎ比が悪化し、被検出物の検出精度の低下を引き起こすおそれがあった。 On the other hand, in the surface mount type photo interrupter as described in Patent Document 2, the light emitting element and the light receiving element that are mounted on the surface are formed of a translucent resin body having a parabolic surface, and the light transmitting element. Since it is sealed by the light shielding resin body provided above the resin body, the light emitted from the light emitting element can be guided toward the light receiving side. However, since the light-shielding resin body is formed above the substrate, the light-shielding resin body has a low flatness of the substrate and has unevenness, or due to variations in filling and molding the resin material on the substrate, the above-mentioned There may be a slight gap at the boundary between the translucent resin body and the light shielding resin body. If such a gap is generated, light on the light emitting side leaks to the surroundings, and the light receiving element detects unnecessary external light, so that the S / N ratio is deteriorated and the detection accuracy of the detection object may be lowered. It was.

そこで、本発明の目的は、基板上に対向配置される発光素子及び受光素子と、この発光素子及び受光素子を封止する透光樹脂体とからなるフォトインタラプタにおいて、前記透光樹脂体に遮光又は反射作用を備えた被覆部材を隙間なく被覆することによって、前記発光部から出射された光を効率よく受光部に入射させることのできる表面実装タイプのフォトインタラプタを提供することである。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a photo interrupter comprising a light emitting element and a light receiving element that are arranged opposite to each other on a substrate and a light transmitting resin body that seals the light emitting element and the light receiving element, and shields the light transmitting resin body from light. Alternatively, it is to provide a surface-mount type photo interrupter that can efficiently make the light emitted from the light emitting part incident on the light receiving part by covering the covering member having a reflecting action without any gap.

上記課題を解決するために、本発明のフォトインタラプタは、基板と、この基板の上部に左右対向して設けられる発光部及び受光部とを備え、前記発光部が前記基板の上面に実装される発光素子と、この発光素子を封止する発光側の透光樹脂体とからなり、前記受光部が前記基板の上面に実装される受光素子と、この受光素子を封止する受光側の透光樹脂体とからなるフォトインタラプタであって、前記発光側及び受光側の透光樹脂体の外周が、前記素子が実装される基板の上面より下方に延びる外周延長部を有する被覆部材によって被覆されることを特徴とする。 In order to solve the above-described problems, a photo interrupter of the present invention includes a substrate, and a light emitting unit and a light receiving unit provided on the upper side of the substrate so as to face left and right, and the light emitting unit is mounted on the upper surface of the substrate. A light-receiving element that includes a light-emitting element and a light-transmitting light-transmitting resin body that seals the light-emitting element, the light-receiving portion being mounted on the upper surface of the substrate, and a light-receiving-side light-transmitting element that seals the light receiving element A photo interrupter comprising a resin body, wherein the outer circumferences of the light emitting side and light receiving side translucent resin bodies are covered with a covering member having an outer peripheral extension extending downward from an upper surface of a substrate on which the element is mounted. It is characterized by that.

本発明に係るフォトインタラプタによれば、前記発光側及び受光側の透光樹脂体を覆う被覆部材が発光素子や受光素子が実装されている基板の上面より下方に延びる外周延長部を有して形成されることによって、前記基板と透光樹脂体の境界面での発光漏れを有効に防止することができる。これによって、受光部側での入射効率が高まり、検出精度の向上効果が得られる。 According to the photo interrupter of the present invention, the covering member that covers the light transmitting side and the light receiving side translucent resin body has an outer peripheral extension extending downward from the upper surface of the substrate on which the light emitting element and the light receiving element are mounted. By being formed, light emission leakage at the interface between the substrate and the translucent resin body can be effectively prevented. As a result, the incident efficiency on the light receiving unit side is increased, and an effect of improving detection accuracy is obtained.

以下、添付図面に基づいて本発明に係るフォトインタラプタの実施形態を詳細に説明する。 Embodiments of a photo interrupter according to the present invention will be described below in detail with reference to the accompanying drawings.

図１乃至図３に示すように、第１の実施形態に係るフォトインタラプタ２１は、ブロック状の基板２２と、この基板２２の上面に配置された発光部２３及び受光部２４とを備える。前記基板２２は、断面凹形状の溝部２５を中央部分に有する略立体形状であり、前記溝部２５を挟んで左右両側の上面２６，２７に前記発光部２３及び受光部２４が設けられている。なお、前記上面２６，２７は同一高さに形成されている。 As shown in FIGS. 1 to 3, the photointerrupter 21 according to the first embodiment includes a block-shaped substrate 22, and a light emitting unit 23 and a light receiving unit 24 disposed on the upper surface of the substrate 22. The substrate 22 has a substantially three-dimensional shape having a groove portion 25 having a concave cross section at the center, and the light emitting portion 23 and the light receiving portion 24 are provided on upper surfaces 26 and 27 on both the left and right sides of the groove portion 25. The upper surfaces 26 and 27 are formed at the same height.

前記発光部２３は、前記基板２２の一方の上面２６に発光面２９を上向きにして配置される発光素子２８と、この発光素子２８を封止するために基板２２の上面２６に形成される発光側の透光樹脂体３０と、この透光樹脂体３０の外周面の一部に形成される光反射体３０ａと、透光樹脂体３０を覆う遮光樹脂体３１とを有している。前記発光素子２８は、例えば上面に強い発光面を有するチップ状の角形発光ダイオードであり、基板２２の上面２６にプリント形成された電極板（図示せず）の上に配置されている。透光樹脂体３０は、前記発光素子２８から発せられる光を通す透光性を有した樹脂材が用いられ、発光素子２８の上方位置に受光部２４側に向かって傾斜する傾斜背面３２を有して形成されている。この傾斜背面３２は、発光素子２８から放出した光を反射させて受光部２４側に導く。そのためこの傾斜面３２の傾斜角度も重要となる。 The light emitting unit 23 includes a light emitting element 28 disposed on one upper surface 26 of the substrate 22 with the light emitting surface 29 facing upward, and light emission formed on the upper surface 26 of the substrate 22 to seal the light emitting element 28. The translucent resin body 30 on the side, a light reflector 30 a formed on a part of the outer peripheral surface of the translucent resin body 30, and a light shielding resin body 31 covering the translucent resin body 30 are provided. The light emitting element 28 is, for example, a chip-shaped square light emitting diode having a strong light emitting surface on the upper surface, and is disposed on an electrode plate (not shown) printed on the upper surface 26 of the substrate 22. The translucent resin body 30 is made of a translucent resin material that transmits light emitted from the light emitting element 28, and has an inclined back surface 32 that is inclined toward the light receiving unit 24 at a position above the light emitting element 28. Is formed. The inclined back surface 32 reflects the light emitted from the light emitting element 28 and guides it to the light receiving unit 24 side. Therefore, the inclination angle of the inclined surface 32 is also important.

また、前記発光素子２８からは前記発光面２９のみならず側面からも放出されるので、それらの光も効果的に反射させるために、前記傾斜背面３２を設けた透光樹脂体３０全体を被覆部材（遮光樹脂体）３１によって封止する。本発明の特徴的な点は、図１及び図２に示したように、前記遮光樹脂体３１が、前記透光樹脂体３０の形成面より下の基板２２側に延長して覆う外周延長部３１ａを有して形成されたところにある。また、前記基板２２には、透光樹脂体３０の外周に沿って前記外周延長部３１ａが入り込んで満たすための凹部３９が設けられている。この凹部３９は、前記基板２２の外周部をハーフエッチングして段差状に形成される。前記遮光樹脂体３１は、基板２２上に金型を配設し、遮光性の樹脂材を前記凹部３９に行き渡るようにして充填して成形される。また、被覆部材としては、遮光樹脂体３１の他に、前記外周延長部３１ａを有した金属薄膜であってもよい。このような金属薄膜によって形成される場合は、メッキ又は蒸着によって、前記透光樹脂体３０の外周部から前記凹部３９に延長して形成される。 Further, since the light emitting element 28 emits not only from the light emitting surface 29 but also from the side surface, in order to reflect the light effectively, the entire translucent resin body 30 provided with the inclined back surface 32 is covered. Sealed with a member (light-shielding resin body) 31. As shown in FIGS. 1 and 2, the characteristic point of the present invention is that the light shielding resin body 31 extends and covers the substrate 22 side below the surface on which the light transmitting resin body 30 is formed. It is in the place formed with 31a. The substrate 22 is provided with a recess 39 for the outer peripheral extension 31 a to enter and fill along the outer periphery of the translucent resin body 30. The recess 39 is formed in a step shape by half-etching the outer peripheral portion of the substrate 22. The light shielding resin body 31 is molded by disposing a mold on the substrate 22 and filling the concave portion 39 with a light shielding resin material. Further, as the covering member, in addition to the light shielding resin body 31, a metal thin film having the outer peripheral extension 31a may be used. When formed with such a metal thin film, it is formed by extending from the outer peripheral portion of the translucent resin body 30 to the concave portion 39 by plating or vapor deposition.

前記遮光樹脂体３１の形状は特に制限されないが、小型化及び薄型化を図る場合や成形を容易にするために、外形形状が略直方体であり、基板２２の上面２６と略同じ形状の底面を有するのが好ましい。また、前記透光樹脂体３０及び遮光樹脂体３１の樹脂材料は特に制約を受けることがない。例えば、透光樹脂体３０の樹脂材料としては、透明エポキシや透明シリコンなどを用いることができ、遮光樹脂体３１としては、酸化チタン入りエポキシなどを用いることができる。また、傾斜背面３２の外表面に光反射体を形成することで、受光部２４に向かわせる光量を多くすることができる。前記光反射体は、反射率の高い銀やアルミニウム等の金属薄膜をメッキ又は蒸着することによって形成される。なお、前記光反射体３０ａは、前記金属薄膜以外に、傾斜背面３２の外周面に塗布される銀やアルミニウム等の微粒子が含有された塗料であってもよい。 The shape of the light-shielding resin body 31 is not particularly limited. However, in order to reduce the size and thickness of the light-shielding resin body 31 or to facilitate molding, the outer shape is a substantially rectangular parallelepiped, and the bottom surface has the same shape as the top surface 26 of the substrate 22. It is preferable to have. Further, the resin material of the light transmitting resin body 30 and the light shielding resin body 31 is not particularly restricted. For example, as the resin material of the translucent resin body 30, transparent epoxy, transparent silicon, or the like can be used, and as the light shielding resin body 31, epoxy containing titanium oxide or the like can be used. Further, by forming a light reflector on the outer surface of the inclined back surface 32, the amount of light directed toward the light receiving unit 24 can be increased. The light reflector is formed by plating or vapor-depositing a metal thin film such as silver or aluminum having a high reflectance. The light reflector 30a may be a paint containing fine particles such as silver and aluminum applied to the outer peripheral surface of the inclined back surface 32 in addition to the metal thin film.

この実施形態において、前記遮光樹脂体３１の溝部２５側の前面３６には前記傾斜背面３２などで反射した光を受光部２４側に出射するための出射部として、例えば出射スリット３７が形成されている。この出射スリット３７は、前記前面３６の略中央部に縦方向に形成されるもので、スリット表面には前記透光樹脂体３０の一部が露出している。 In this embodiment, for example, an exit slit 37 is formed on the front surface 36 on the groove portion 25 side of the light shielding resin body 31 as an exit portion for emitting the light reflected by the inclined back surface 32 or the like to the light receiving portion 24 side. Yes. The exit slit 37 is formed in a vertical direction at a substantially central portion of the front surface 36, and a part of the translucent resin body 30 is exposed on the slit surface.

一方、受光部２４は、前記基板２２の溝部２５を挟んで発光部２３と対向する位置に設けられ、基板２２の他方の上面２７に受光面４１を上向きにして配置される受光素子４０と、この受光素子４０を封止するために基板２２の上面２７に形成される透光樹脂体４２と、透光樹脂体４２の形成面である基板２２の上面より下方に延びる外周延長部４３ａを有した遮光樹脂体４３とからなっている。また、前記透光樹脂体４２の外周部の基板２２面には、前記外周延長部４３ａを埋設するための凹部３９が設けられる。受光素子４０は、例えば上面に受光面４１を有するチップ状のフォトトランジスタであり、前記発光ダイオードと同様、基板２２の上面２７にプリント形成された電極板（図示せず）の上に配置されている。透光樹脂体４２の形状は、受光素子４０の上方位置に設けられる傾斜背面４４が発光素子２８側に傾斜し、反射作用を高めるための光反射体３０ａが必要に応じて設けられている以外は、前記発光部２３側の透光樹脂体３０と同様の構成からなるので、ここでは詳細な説明を省略する。また、遮光樹脂体４３及びこの遮光樹脂体４３の溝部２５側の前面４８に形成される光の入射部としての入射スリット４９も発光部２３側と同様の構成からなるので、ここでは詳細な説明を省略する。 On the other hand, the light receiving unit 24 is provided at a position facing the light emitting unit 23 across the groove 25 of the substrate 22, and the light receiving element 40 is disposed on the other upper surface 27 of the substrate 22 with the light receiving surface 41 facing upward, A light-transmitting resin body 42 formed on the upper surface 27 of the substrate 22 for sealing the light receiving element 40 and an outer peripheral extension 43a extending downward from the upper surface of the substrate 22 on which the light-transmitting resin body 42 is formed are provided. The light shielding resin body 43. In addition, a concave portion 39 for embedding the outer peripheral extension 43a is provided on the surface of the substrate 22 at the outer peripheral portion of the translucent resin body 42. The light receiving element 40 is, for example, a chip-like phototransistor having a light receiving surface 41 on the upper surface, and is disposed on an electrode plate (not shown) printed on the upper surface 27 of the substrate 22 like the light emitting diode. Yes. The shape of the translucent resin body 42 is such that an inclined back surface 44 provided at a position above the light receiving element 40 is inclined to the light emitting element 28 side, and a light reflector 30a for enhancing the reflection action is provided as necessary. Since it has the same configuration as the translucent resin body 30 on the light emitting section 23 side, detailed description thereof is omitted here. Further, since the light-receiving resin body 43 and the incident slit 49 as the light incident part formed on the front surface 48 on the groove part 25 side of the light-shielding resin body 43 have the same configuration as that of the light-emitting part 23 side, detailed description will be given here. Is omitted.

この実施形態のフォトインタラプタ２１にあっては、前記発光部２３の発光素子２８、出射スリット３７と、受光部２４の受光素子４０、入射スリット４９とが、一直線上に位置している。また、前記基板２２の下面には図２で示したマザーボード５１の上面プリント配線（図示せず）に表面実装するための接続電極が四隅に設けられ、この接続電極は基板２２の側面電極５３を介して前記発光素子２８及び受光素子４０が配置される電極板（図示せず）と導通している。 In the photo interrupter 21 of this embodiment, the light emitting element 28 and the exit slit 37 of the light emitting unit 23, and the light receiving element 40 and the entrance slit 49 of the light receiving unit 24 are located on a straight line. Further, connection electrodes for surface mounting on the upper surface printed wiring (not shown) of the mother board 51 shown in FIG. 2 are provided on the lower surface of the substrate 22 at the four corners. It is electrically connected to an electrode plate (not shown) on which the light emitting element 28 and the light receiving element 40 are disposed.

次に、上記構成からなるフォトインタラプタ２１の作用について説明する。図２に示されるように、発光素子２８の発光面２９から放出された光は、透光樹脂体３０の傾斜背面３２やその他の側面において反射が繰り返されるが、前記発光側の遮光樹脂体３１の外周延長部３１ａが透光樹脂体３０の外周下端部を基板２２の下方まで完全に覆っているため、外部への発光漏れを完全に遮断することができる。これによって、透光樹脂体３０内での反射光量が高い状態で受光部２４側に出射される。一方、受光部２４内に入射された光は、透光樹脂体４２の傾斜背面４４やその他の側面で下向きに反射が繰り返されるが、この受光側の遮光樹脂体４３においても、外周延長部４３ａが透光樹脂体４２の外周部下端部が隙間なく被覆されるため、受光部２４内に入射した光は受光素子４０に効率よく取り込むことができる。このように、前記発光部２３と受光部２４の間を伝達する透過光の収束性が高まるため、被検出物が溝部２５を通過して透過光を遮った際に、受光素子４０での受光量の変化を正確に感知し、被検出物の有無や位置を精度よく検出することができる。 Next, the operation of the photo interrupter 21 having the above configuration will be described. As shown in FIG. 2, the light emitted from the light emitting surface 29 of the light emitting element 28 is repeatedly reflected on the inclined back surface 32 and other side surfaces of the translucent resin body 30, but the light shielding resin body 31 on the light emitting side. Since the outer peripheral extension 31 a completely covers the lower end of the outer periphery of the translucent resin body 30 to the lower side of the substrate 22, it is possible to completely block light leakage to the outside. Thus, the light is emitted toward the light receiving unit 24 in a state where the amount of reflected light in the translucent resin body 30 is high. On the other hand, the light incident on the light receiving portion 24 is repeatedly reflected downward on the inclined back surface 44 and other side surfaces of the translucent resin body 42, but also in the light shielding resin body 43 on the light receiving side, the outer peripheral extension 43a. However, since the lower end portion of the outer peripheral portion of the translucent resin body 42 is covered without a gap, the light incident into the light receiving portion 24 can be efficiently taken into the light receiving element 40. Thus, since the convergence of the transmitted light transmitted between the light emitting unit 23 and the light receiving unit 24 is increased, the light receiving element 40 receives light when the detected object passes through the groove 25 and blocks the transmitted light. It is possible to accurately detect the change in the amount and accurately detect the presence and position of the object to be detected.

前記発光部２３の傾斜背面３２は、図２及び図３に示されるように、出射スリット３７に対応した狭い部分だけでなく傾斜背面３２全体が反射面として形成されている他、透光樹脂体３０の後面３３及び左右側面３４，３５も前記遮光樹脂体３１で被覆されているために、発光素子２８の上面のみならず側面から放出した光も周囲の反射面によって反射されるので、発光部２３内での光量が増え、これらが強い光となって出射スリット３７からすり抜けていく。一方、入射スリット４９に導かれて受光部２４内に入射された光も、前記発光部２３と同様、透光樹脂体４２の傾斜背面４４のみならず外周面全体が反射面となるので、受光素子４０の受光面４１には強い光が入射されることになり、発光部２３のみならず受光部２４でも光の反射を効率的に利用して受光量を増やすことができ、検出精度を向上させることができる。 As shown in FIGS. 2 and 3, the inclined back surface 32 of the light emitting unit 23 is not only a narrow portion corresponding to the exit slit 37 but also the entire inclined back surface 32 is formed as a reflective surface. Since the rear surface 33 and the left and right side surfaces 34 and 35 of the 30 are also covered with the light shielding resin body 31, the light emitted from the side surfaces as well as the upper surface of the light emitting element 28 is reflected by the surrounding reflecting surfaces. The amount of light in the light source 23 increases, and these become strong light and pass through the exit slit 37. On the other hand, the light that has been guided to the entrance slit 49 and entered into the light receiving portion 24 is also received by the entire outer peripheral surface as well as the inclined back surface 44 of the translucent resin body 42, as in the light emitting portion 23. Strong light is incident on the light receiving surface 41 of the element 40, and not only the light emitting unit 23 but also the light receiving unit 24 can efficiently use the reflection of light to increase the amount of received light and improve detection accuracy. Can be made.

本実施形態に係るフォトインタラプタ２１によれば、発光素子２８の発光面２９と受光素子４０の受光面４１とを対向させることなく、ともに上向きに配置している。そうすることで、上記した反射光の効率的な利用の他に、同じ基板上に両方の素子を配置し、その上方を樹脂封止した構造とすることで、表面実装可能な超小型のフォトインタラプタ２１の形成が可能となる。 According to the photo interrupter 21 according to the present embodiment, the light emitting surface 29 of the light emitting element 28 and the light receiving surface 41 of the light receiving element 40 are both arranged upward without facing each other. By doing so, in addition to the efficient use of reflected light as described above, both elements are arranged on the same substrate, and the upper part is made of resin-sealed structure, so that it can be mounted on the surface of a microminiature photo. The interrupter 21 can be formed.

図４は、本発明に係るフォトインタラプタの第２の実施形態を示したものである。この実施形態に係るフォトインタラプタ６１は、前記第１の実施形態で示したフォトインタラプタ２１において、出射スリット３７及び入射スリット４９を除いた発光部２３及び受光部２４の透光樹脂体３０，４２の外周面全体を被覆部材（光反射体）３０ａ，４２ａで被覆して形成したものである。この光反射体３０ａ，４２ａは、前記透光樹脂体３０，４２の形成面より基板２２に設けた凹部６９に入り込む外周延長部３０ｂ，４２ｂが一体形成されている。このような光反射体３０ａ，４２ａを前記透光樹脂体３０，４２の傾斜背面３２，４４のみならず後面や左右側面を隙間なく被覆することで、前記発光部２３においては、発光素子２８から発せられる光の外部への漏れを防止し、出射スリット３７からの放出光量が高められ、受光部２４においては、入射スリット４９に入射された光を効率よく受光素子４０に取り込むことができる。前記光反射体３０ａ，４２ａは、前述したような高反射率を有する金属薄膜をメッキや蒸着によって形成されるか、光反射効果を有する塗料を直接塗装等することによって形成することができる。なお、この実施形態のフォトインタラプタ６１のように、透光樹脂体３０，４２全体が光反射体３０ａ，４２ａで被覆した場合は、前述したような遮光樹脂体によって被覆する必要がない。 FIG. 4 shows a second embodiment of the photo interrupter according to the present invention. The photointerrupter 61 according to this embodiment is the same as that of the photointerrupter 21 shown in the first embodiment except for the light-transmitting resin bodies 30 and 42 of the light-emitting unit 23 and the light-receiving unit 24 excluding the exit slit 37 and the entrance slit 49. The entire outer peripheral surface is formed by covering with covering members (light reflectors) 30a and 42a. The light reflectors 30a and 42a are integrally formed with outer peripheral extension portions 30b and 42b that enter the recesses 69 provided in the substrate 22 from the surface on which the transparent resin bodies 30 and 42 are formed. By covering such light reflectors 30a and 42a not only on the inclined rear surfaces 32 and 44 of the translucent resin bodies 30 and 42 but also on the rear surface and the left and right side surfaces without any gaps, Leakage of emitted light to the outside is prevented, the amount of light emitted from the exit slit 37 is increased, and the light incident on the entrance slit 49 can be efficiently taken into the light receiving element 40 in the light receiving unit 24. The light reflectors 30a and 42a can be formed by plating or vapor-depositing a metal thin film having a high reflectivity as described above, or by directly applying a paint having a light reflection effect. In addition, like the photo interrupter 61 of this embodiment, when the translucent resin bodies 30 and 42 are entirely covered with the light reflectors 30a and 42a, it is not necessary to cover with the light shielding resin body as described above.

図５及び図６は、本発明に係るフォトインタラプタの第３の実施形態を示したものである。この実施形態に係るフォトインタラプタ７１は、発光素子２８及び受光素子４０を封止する透光樹脂体７５，７６が湾曲状の傾斜背面７５ａ，７６ａを有して形成され、これら傾斜背面７５ａ，７６ａの外周面に光反射体７５ｂ，７６ｂを形成したものである。前記傾斜背面７５ａ，７６ａは、発光素子２８及び受光素子４０のそれぞれ上方から後方にかけて湾曲する円筒体の１／４形状であるが、たとえば左右側面も湾曲したドーム型の一部形状であってもよい。このように、傾斜背面７５ａ，７６ａを湾曲状にして形成することで、発光部７３では発光素子２８から発せられた光を出射スリット７５ｃ付近に集光し易くなり、一方の受光部７４では入射スリット７６ｃから入射された光を受光素子４０に集光し易い構造となる。また、前記光反射体７５ｂ，７６ｂ以外の面からの反射作用を得るため、前記透光樹脂体７５，７６が被覆部材（遮光樹脂体）７７，７８で被覆される。この遮光樹脂体７７，７８は、前記実施形態と同様に透光樹脂体７５，７６の外周下端部よりも基板７２に設けた凹部７９内に入り込む外周延長部７７ａ，７８ａを有して形成される。 5 and 6 show a third embodiment of the photo-interrupter according to the present invention. In the photo interrupter 71 according to this embodiment, translucent resin bodies 75 and 76 for sealing the light emitting element 28 and the light receiving element 40 are formed having curved inclined back surfaces 75a and 76a, and these inclined back surfaces 75a and 76a. The light reflectors 75b and 76b are formed on the outer peripheral surface of the substrate. The inclined back surfaces 75a and 76a have a quarter shape of a cylindrical body that curves from the upper side to the rear side of the light emitting element 28 and the light receiving element 40 respectively. Good. Thus, by forming the inclined back surfaces 75a and 76a in a curved shape, the light emitted from the light emitting element 28 in the light emitting portion 73 can be easily collected in the vicinity of the exit slit 75c, and incident on the one light receiving portion 74. The light incident from the slit 76c is easily condensed on the light receiving element 40. In addition, the translucent resin bodies 75 and 76 are covered with covering members (light-shielding resin bodies) 77 and 78 in order to obtain a reflection effect from surfaces other than the light reflectors 75b and 76b. The light shielding resin bodies 77 and 78 are formed to have outer peripheral extension portions 77a and 78a that enter into the recess 79 provided in the substrate 72 rather than the lower peripheral lower end portions of the translucent resin bodies 75 and 76, as in the above embodiment. The

図７は、本発明に係るフォトインタラプタの第４の実施形態を示したものである。この実施形態に係るフォトインタラプタ８１は、前記フォトインタラプタ７１と同様に、透光樹脂体８５，８６が湾曲状の傾斜背面を有して形成され、これら傾斜背面以外の面全てを光反射体８５ｂ，８６ｂによって被覆して形成したものである。また、前記光反射体８５ｂ，８６ｂの全ての外周下端部を透光樹脂体８５，８６の下端部よりも基板８２に設けた凹部８９内に入り込む外周延長部８５ｃ，８６ｃを有して形成される。これによって、出射スリット８５ｄにおける出射光量及び入射スリット８６ｄでの入射効率をさらに高めることができる。なお、このような構成にする場合は、前記第２実施形態のフォトインタラプタ６１と同様に遮光樹脂体を設けなくてもよい。この実施形態に係るフォトインタラプタ８１は、湾曲状の傾斜背面７５ａ，７６ａを除いた構成が、前記第１の実施形態と略同じなので、それら共通する構成については同一の符号を付して詳細な説明は省略する。 FIG. 7 shows a fourth embodiment of the photo interrupter according to the present invention. In the photointerrupter 81 according to this embodiment, like the photointerrupter 71, the translucent resin bodies 85 and 86 are formed to have a curved inclined back surface, and all the surfaces other than the inclined back surface are light reflectors 85b. , 86b. Further, the outer peripheral lower end portions of the light reflectors 85b and 86b are formed to have outer peripheral extension portions 85c and 86c that enter the recesses 89 provided in the substrate 82 rather than the lower end portions of the translucent resin bodies 85 and 86. The As a result, the amount of emitted light at the exit slit 85d and the incident efficiency at the entrance slit 86d can be further increased. In addition, when setting it as such a structure, it is not necessary to provide the light shielding resin body similarly to the photo interrupter 61 of the said 2nd Embodiment. The photointerrupter 81 according to this embodiment has the same configuration as that of the first embodiment except for the curved inclined back surfaces 75a and 76a. Description is omitted.

本発明の第１実施形態に係るフォトインタラプタの全体形状を示す斜視図である。It is a perspective view showing the whole photo interrupter shape concerning a 1st embodiment of the present invention. 前記図１においてＡ−Ａ線に沿って切断した断面図である。It is sectional drawing cut | disconnected along the AA line in the said FIG. 前記図１に示したフォトインタラプタの平面図である。FIG. 2 is a plan view of the photo interrupter shown in FIG. 1. 本発明の第２実施形態に係るフォトインタラプタの全体形状を示す斜視図である。It is a perspective view which shows the whole photo interrupter shape which concerns on 2nd Embodiment of this invention. 本発明の第３実施形態に係るフォトインタラプタの全体形状を示す斜視図である。It is a perspective view which shows the whole photo interrupter shape which concerns on 3rd Embodiment of this invention. 前記図５においてＢ−Ｂ線に沿って切断した断面図である。It is sectional drawing cut | disconnected along the BB line in the said FIG. 本発明の第４実施形態に係るフォトインタラプタの全体形状を示す斜視図である。It is a perspective view which shows the whole photo interrupter shape which concerns on 4th Embodiment of this invention. 従来のフォトインタラプタの一構成例を示す断面図である。It is sectional drawing which shows the example of 1 structure of the conventional photo interrupter.

符号の説明Explanation of symbols

２１フォトインタラプタ
２２基板
２３発光部
２４受光部
２５溝部
２６，２７上面
２８発光素子
２９発光面
３０透光樹脂体
３０ａ光反射体
３０ｂ外周延長部
３１遮光樹脂体
３１ａ外周延長部
３２傾斜背面
３３後面
３４，３５左右側面
３６前面
３７出射スリット
３９凹部
４０受光素子
４１受光面
４２透光樹脂体
４２ａ光反射材
４３遮光樹脂体
４３ａ外周延長部
４９入射スリット DESCRIPTION OF SYMBOLS 21 Photointerrupter 22 Substrate 23 Light-emitting part 24 Light-receiving part 25 Groove part 26, 27 Upper surface 28 Light-emitting element 29 Light-emitting surface 30 Translucent resin body 30a Light reflector 30b Outer peripheral extension part 31 Light-shielding resin body 31a Outer peripheral extension part 32 Inclined back surface 33 Rear surface 34 , 35 Left and right side surfaces 36 Front surface 37 Outgoing slit 39 Recessed portion 40 Light receiving element 41 Light receiving surface 42 Translucent resin body 42a Light reflecting material 43 Light shielding resin body 43a Outer peripheral extension portion 49 Incoming slit

Claims

基板と、
この基板の上部に左右対向して設けられる発光部及び受光部とを備え、
前記発光部が前記基板の上面に実装される発光素子と、この発光素子を封止する発光側の透光樹脂体とからなり、
前記受光部が前記基板の上面に実装される受光素子と、この受光素子を封止する受光側の透光樹脂体とからなるフォトインタラプタであって、
前記発光側及び受光側の透光樹脂体の外周が、前記素子が実装される基板の上面より下方に延びる外周延長部を有する被覆部材によって被覆されることを特徴とするフォトインタラプタ。 A substrate,
A light emitting part and a light receiving part provided on the upper side of the substrate so as to face left and right,
The light emitting unit is composed of a light emitting element mounted on the upper surface of the substrate, and a light emitting side translucent resin body for sealing the light emitting element,
A light interrupter comprising a light receiving element on which the light receiving unit is mounted on the upper surface of the substrate and a light transmitting resin body on the light receiving side for sealing the light receiving element;
An outer periphery of the light-emitting side and light-receiving side translucent resin body is covered with a covering member having an outer peripheral extension extending downward from an upper surface of a substrate on which the element is mounted.

前記被覆部材が、遮光樹脂体又は光反射体で構成される請求項１記載のフォトインタラプタ。 The photo interrupter according to claim 1, wherein the covering member is formed of a light shielding resin body or a light reflector.

前記基板の上面には、前記発光側及び受光側それぞれの透光樹脂体の外周部に沿って凹部が設けられ、この凹部に前記被覆部材の外周延長部が埋設される請求項１記載のフォトインタラプタ。 2. The photo according to claim 1, wherein a concave portion is provided on the upper surface of the substrate along the outer peripheral portion of the light transmitting resin body on each of the light emitting side and the light receiving side, and the outer peripheral extension portion of the covering member is embedded in the concave portion. Interruptor.

前記発光部は、前記基板の上面に発光面を上向きにして配置される発光素子と、この発光素子から発せられる光を前記受光部に向けて反射させる傾斜背面を有する発光側の透光樹脂体とを備え、前記傾斜背面が光反射体によって形成されている請求項１記載のフォトインタラプタ。 The light emitting part is a light emitting side translucent resin body having a light emitting element disposed on an upper surface of the substrate with a light emitting surface facing upward, and an inclined back surface that reflects light emitted from the light emitting element toward the light receiving part. The photo interrupter according to claim 1, wherein the inclined back surface is formed of a light reflector.

前記受光部は、前記基板の上面に受光面を上向きにして配置される受光素子と、この受光素子に前記発光部から発せられた光を反射させる傾斜背面を有する受光側の透光樹脂体とを備え、前記傾斜背面が光反射体によって形成されている請求項１記載のフォトインタラプタ。 The light receiving unit includes a light receiving element disposed on an upper surface of the substrate with a light receiving surface facing upward, and a light receiving side translucent resin body having an inclined back surface that reflects light emitted from the light emitting unit to the light receiving element; The photo interrupter according to claim 1, wherein the inclined back surface is formed of a light reflector.

前記発光側の透光樹脂体の前面にスリット状の出射部が設けられ、この出射部を除く透光樹脂体の外周面が前記光反射体によって形成されている請求項１記載のフォトインタラプタ。 2. The photointerrupter according to claim 1, wherein a slit-like light emitting portion is provided on a front surface of the light transmitting side light transmitting resin body, and an outer peripheral surface of the light transmitting resin body excluding the light emitting portion is formed by the light reflector.

前記受光側の透光樹脂体の前面にスリット状の入射部が設けられ、この入射部を除く透光樹脂体の外周面が前記光反射体によって形成されている請求項１記載のフォトインタラプタ。 2. The photointerrupter according to claim 1, wherein a slit-shaped incident portion is provided on a front surface of the light-transmitting light-transmitting resin body, and an outer peripheral surface of the light-transmitting resin body excluding the incident portion is formed by the light reflector.

前記光反射体は、メッキ又は蒸着によって形成される金属薄膜である請求項４乃至７のいずれかに記載のフォトインタラプタ。 The photo interrupter according to claim 4, wherein the light reflector is a metal thin film formed by plating or vapor deposition.

前記傾斜背面が平坦面状又は湾曲面状に形成される請求項４又は５記載のフォトインタラプタ。 6. The photo interrupter according to claim 4, wherein the inclined back surface is formed in a flat surface shape or a curved surface shape.