JPWO2008117800A1 - Reflective light sensor - Google Patents

Reflective light sensor Download PDF

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JPWO2008117800A1
JPWO2008117800A1 JP2009506345A JP2009506345A JPWO2008117800A1 JP WO2008117800 A1 JPWO2008117800 A1 JP WO2008117800A1 JP 2009506345 A JP2009506345 A JP 2009506345A JP 2009506345 A JP2009506345 A JP 2009506345A JP WO2008117800 A1 JPWO2008117800 A1 JP WO2008117800A1
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仁科 ▲りん▼太郎
▲りん▼太郎 仁科
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仁科 ▲りん▼太郎
▲りん▼太郎 仁科
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/16Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits
    • H01L25/167Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits comprising optoelectronic devices, e.g. LED, photodiodes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02Details
    • H01L31/0203Containers; Encapsulations, e.g. encapsulation of photodiodes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/12Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof structurally associated with, e.g. formed in or on a common substrate with, one or more electric light sources, e.g. electroluminescent light sources, and electrically or optically coupled thereto
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/10Bump connectors; Manufacturing methods related thereto
    • H01L2224/15Structure, shape, material or disposition of the bump connectors after the connecting process
    • H01L2224/16Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001Technical content checked by a classifier
    • H01L2924/00011Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001Technical content checked by a classifier
    • H01L2924/00014Technical content checked by a classifier the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details

Abstract

反射型光センサ10は、上面側に光が通る窓部を有し下部に収納空間21を有するカバー筐体20と、カバー筐体20の下部の収納空間21の開口を覆うシールド蓋24とを含み、収納空間21に、回路基板50、受光素子60、遮光板62、電子回路70、透光性基板80、発光素子82等が収納配置される。透光性基板80には、その中央部にバンプ端子を用いて発光素子82が取り付けられ、周辺部において回路基板50に取り付けられる。透光性基板80は、発光素子82が受光素子60のほぼ中央に来るように、受光素子60の上面側に配置される。The reflective optical sensor 10 includes a cover housing 20 having a window portion through which light passes on the upper surface side and a storage space 21 in the lower portion, and a shield lid 24 covering the opening of the storage space 21 below the cover housing 20. In addition, the circuit board 50, the light receiving element 60, the light shielding plate 62, the electronic circuit 70, the translucent substrate 80, the light emitting element 82, and the like are accommodated in the accommodating space 21. A light emitting element 82 is attached to the translucent substrate 80 using a bump terminal at the center, and attached to the circuit board 50 at the periphery. The translucent substrate 80 is disposed on the upper surface side of the light receiving element 60 so that the light emitting element 82 is located approximately at the center of the light receiving element 60.

Description

本発明は反射型光センサに係り、特に、発光素子と受光素子とを含む反射型光センサに関する。   The present invention relates to a reflective optical sensor, and more particularly to a reflective optical sensor including a light emitting element and a light receiving element.

反射型光センサは、対象物に発光素子から光を当て、対象物からの反射光を受光素子で受けて、対象物の位置、変位、物性等を検出するために広く用いられる。この場合に、発光素子から放射される光の軸と、受光素子が検出する反射光の光の軸とが一致していると、発光素子からの光が受光素子に効率よく集めることができ、例えば、位置、変位等の検出精度が向上する。しかし一般的には、発光素子と受光素子とは別々の素子であるので、これらの光軸を同軸に配置することが困難である。そのために、発光素子の光軸と受光素子の光軸とが所定の角度関係になるように、予め、発光素子と受光素子との配置関係を正確に設定することが行われる。   A reflection type optical sensor is widely used to detect the position, displacement, physical properties, etc. of an object by applying light from a light emitting element to the object and receiving the reflected light from the object by a light receiving element. In this case, if the axis of the light emitted from the light emitting element matches the axis of the light of the reflected light detected by the light receiving element, the light from the light emitting element can be efficiently collected on the light receiving element, For example, the detection accuracy of position, displacement, etc. is improved. However, generally, since the light emitting element and the light receiving element are separate elements, it is difficult to arrange these optical axes coaxially. For this purpose, the positional relationship between the light emitting element and the light receiving element is accurately set in advance so that the optical axis of the light emitting element and the optical axis of the light receiving element have a predetermined angular relationship.

一方で、反射型光センサにおいて、発光素子の光軸と受光素子の光軸をできるだけ同軸とし、発光素子の光を効率よく受光素子に集める工夫もなされている。   On the other hand, in a reflection type optical sensor, the optical axis of a light emitting element and the optical axis of a light receiving element are made coaxial as much as possible, and the device which collects the light of a light emitting element to a light receiving element efficiently is also made | formed.

例えば、特許文献1には、反射型光センサとして、発光素子と発光素子の光を上方に導く導光体とを下基板に配置し、下基板の上方に一対の受光素子を導光体の周囲に配置する上基板を配置する構成が開示されている。ここでは、発光素子の光軸は、導光体の中心軸となり、受光素子は導光体の周囲に配置されてその光軸も導光軸を中心とすることになり、これにより、発光素子の光からの反射光を効率よく受光素子に集めることができると述べられている。   For example, in Patent Document 1, as a reflection type optical sensor, a light emitting element and a light guide that guides light of the light emitting element upward are arranged on a lower substrate, and a pair of light receiving elements are arranged above the lower substrate. The structure which arrange | positions the upper board | substrate arrange | positioned around is disclosed. Here, the optical axis of the light emitting element is the central axis of the light guide, and the light receiving element is disposed around the light guide, and the optical axis is also centered on the light guide axis. It is stated that the reflected light from the light can be efficiently collected on the light receiving element.

また、特許文献2には、反射型光センサとして、基板に大型の受光素子を実装し、小型の発光素子を受光素子の上面中央部に積み重ねて実装し、受光素子の上面を介して基板にワイヤボンディングすることが開示されている。ここでは、発光素子を透光性の樹脂で封止しその底面と側面を遮光し、この樹脂の周りをさらに透明性の樹脂を充填して受光素子を封止している。これにより、発光素子を受光領域が取り囲む構造となり、発光素子からの出る光の大部分が受光領域で受光され光の利用効率が大幅に向上すると述べられている。
特開2005−123311号公報 特開2001−326382号公報
In Patent Document 2, as a reflection type optical sensor, a large light-receiving element is mounted on a substrate, and small light-emitting elements are stacked and mounted on the center of the upper surface of the light-receiving element. Wire bonding is disclosed. Here, the light emitting element is sealed with a translucent resin, its bottom and side surfaces are shielded from light, and the periphery of this resin is further filled with a transparent resin to seal the light receiving element. As a result, the light receiving element surrounds the light receiving region, and it is stated that most of the light emitted from the light emitting element is received by the light receiving region and the light use efficiency is greatly improved.
JP 2005-123111 A JP 2001-326382 A

上記特許文献によれば、発光素子から放射する光の軸の中心と受光素子が受け取る光の軸の中心とがほぼ一致するので、発光素子から放射されて対象物から反射されてくる光を効率よく受光素子に集めることができる。しかし、特許文献1においては、導光体を要する。また、特許文献2においては、受光素子の上に発光素子を樹脂封止し、その側壁等を遮光する処理を行い、さらに全体を樹脂封止することを要する。   According to the above-mentioned patent document, since the center of the axis of light emitted from the light emitting element and the center of the axis of light received by the light receiving element substantially coincide with each other, the light emitted from the light emitting element and reflected from the object is efficiently used. It can often be collected in the light receiving element. However, in patent document 1, a light guide is required. Further, in Patent Document 2, it is necessary to perform a process of sealing the light emitting element on the light receiving element, shielding the side wall and the like, and further sealing the whole.

本願の目的は、比較的簡単な構成で、受光素子から放射されて対象物から反射されてくる光を効率よく受光素子に集めることができる反射型光センサを提供することである。   An object of the present application is to provide a reflective optical sensor that can efficiently collect light emitted from a light receiving element and reflected from an object with a relatively simple configuration.

本発明に係る反射型光センサは、上面に受光領域を有する受光素子と、受光素子の上面側に配置される透光性基板と、透光性基板の上面に配置され、平面寸法が受光素子よりも小さい発光素子と、を含むことを特徴とする。   A reflection type photosensor according to the present invention includes a light receiving element having a light receiving region on an upper surface, a translucent substrate disposed on the upper surface side of the light receiving element, and an upper surface of the translucent substrate. And a smaller light emitting element.

また、本発明に係る反射型光センサにおいて、発光素子は、バンプ形状の端子を有し、発光面を透光性基板側に向けてバンプ端子によって透光性基板に実装されることが好ましい。   In the reflective optical sensor according to the present invention, it is preferable that the light emitting element has a bump-shaped terminal and is mounted on the translucent substrate by the bump terminal with the light emitting surface facing the translucent substrate.

また、本発明に係る反射型光センサにおいて、発光素子と受光素子との間に遮光部材または反射部材が設けられることが好ましい。   In the reflective optical sensor according to the present invention, it is preferable that a light shielding member or a reflective member is provided between the light emitting element and the light receiving element.

また、本発明に係る反射型光センサにおいて、透光性基板に設けられる複数の配線であって、一端側が透光性基板の中央部に配置されて発光素子の各端子とそれぞれ接続され、他端側が透光性基板の周辺部にそれぞれ配置される発光素子用配線を有することが好ましい。   Further, in the reflection type photosensor according to the present invention, a plurality of wirings provided on the translucent substrate, one end side of which is disposed at the central portion of the translucent substrate and connected to each terminal of the light emitting element, respectively. It is preferable that the end side has a wiring for a light emitting element, which is arranged in the peripheral part of the translucent substrate.

また、本発明に係る反射型光センサにおいて、複数の配線は、透光性基板を挟んで相互に重なって配置される部分を有することが好ましい。   In the reflection type optical sensor according to the present invention, it is preferable that the plurality of wirings have portions arranged to overlap each other with the translucent substrate interposed therebetween.

また、本発明に係る反射型光センサにおいて、受光素子を搭載する基板であって、透光性基板の周辺部を取り付ける取付部を有する受光素子基板を含み、透光性基板は、その周辺部において位置決めされて受光素子基板に取り付けられることが好ましい。   Further, in the reflection type optical sensor according to the present invention, the substrate includes a light receiving element substrate on which the light receiving element is mounted, the light receiving element substrate having a mounting portion to which the peripheral portion of the light transmitting substrate is attached. It is preferable to be positioned and attached to the light receiving element substrate.

また、本発明に係る反射型光センサにおいて、受光素子基板には、発光素子用の複数の引出配線が取付部を通って設けられ、透光性基板の周辺部が取付部に電気的に接続されて取り付けられることで、発光素子の各端子が複数の引出線と接続されることが好ましい。   In the reflection type photosensor according to the present invention, the light receiving element substrate is provided with a plurality of lead wires for the light emitting element through the attachment portion, and the peripheral portion of the translucent substrate is electrically connected to the attachment portion. By being attached, it is preferable that each terminal of the light emitting element is connected to a plurality of lead wires.

また、本発明に係る反射型光センサにおいて、受光素子基板は、受光素子が搭載される反対側の裏面側に、発光素子または受光素子の少なくとも一方のための電子回路が実装されることが好ましい。   In the reflection type photosensor according to the present invention, the light receiving element substrate is preferably mounted with an electronic circuit for at least one of the light emitting element and the light receiving element on the back side opposite to the side on which the light receiving element is mounted. .

また、本発明に係る反射型光センサにおいて、受光素子と発光素子とを覆う光学的カバー素子であって、発光素子からの光を外部に導き、外部からの反射光を受光素子に導く光学的カバー素子を含むことが好ましい。   The reflective optical sensor according to the present invention is an optical cover element that covers the light receiving element and the light emitting element, and is an optical cover that guides light from the light emitting element to the outside and guides reflected light from the outside to the light receiving element. It is preferable to include a cover element.

また、本発明に係る反射型光センサにおいて、光学的カバー素子は、窓部を除いて光の出入りを制限する遮光部を有することが好ましい。   In the reflective optical sensor according to the present invention, it is preferable that the optical cover element has a light shielding portion that restricts light entry and exit except for the window portion.

上記構成により、反射型光センサは、上面に受光領域を有する受光素子の上面側に透光性基板が配置され、その透光性基板の上面に、平面寸法が受光素子よりも小さい発光素子が配置される。近年の半導体素子の小型化技術の進展によって、例えば小型の発光素子を用いることが容易となってきている。一例を上げると、1つの発光素子の平面寸法が0.2mm角のものを用いることができる。このように小型の発光素子を透光性基板の上に配置し、発光素子よりも大きい平面寸法の受光素子の上にこの透光性基板を配置すれば、比較的簡単な構成で、受光素子から放射されて対象物から反射されてくる光を効率よく受光素子に集めることができる。   With the above configuration, the reflective optical sensor has a light-transmitting substrate disposed on the upper surface side of the light-receiving element having a light-receiving region on the upper surface, and a light-emitting element having a planar dimension smaller than that of the light-receiving element on the upper surface of the light-transmitting substrate Be placed. With recent progress in miniaturization technology of semiconductor elements, it has become easy to use, for example, small light emitting elements. As an example, a light emitting device having a planar dimension of 0.2 mm square can be used. In this way, if a small light-emitting element is arranged on a light-transmitting substrate and the light-transmitting substrate is arranged on a light-receiving element having a larger plane size than the light-emitting element, the light-receiving element has a relatively simple configuration. The light radiated from the light and reflected from the object can be efficiently collected on the light receiving element.

また、発光素子はバンプ形状の端子を有し、バンプ端子によって透光性基板に実装される。これにより、ワイヤボンディングにより接続される場合に比べ、光の経路を妨げることが少なくなり、受光素子から放射されて対象物から反射されてくる光を効率よく受光素子に集めることができる。   The light emitting element has bump-shaped terminals and is mounted on the light-transmitting substrate by the bump terminals. Thereby, compared with the case where it connects by wire bonding, it becomes less obstructive of the path of light, and the light radiated | emitted from a light receiving element and reflected from the target object can be efficiently collected on a light receiving element.

また、発光素子と受光素子との間に遮光部材または反射部材が設けられるので、発光素子から直接受光素子に光が入射することを防止できる。   In addition, since the light shielding member or the reflection member is provided between the light emitting element and the light receiving element, it is possible to prevent light from directly entering the light receiving element from the light emitting element.

また、透光性基板に発光素子用配線が設けられ、その一端側は透光性基板の中央部に配置されて発光素子の各端子とそれぞれ接続され、その他端側は透光性基板の周辺部にそれぞれ配置される。これによって、受光素子のほぼ中央部に発光素子を配置することにしても、その配線を周辺部に引き出すことができる。   In addition, a light-emitting element wiring is provided on the light-transmitting substrate, and one end side thereof is arranged at the center of the light-transmitting substrate and is connected to each terminal of the light-emitting element, and the other end side is the periphery of the light-transmitting substrate. Placed in each part. As a result, even if the light emitting element is arranged at substantially the center of the light receiving element, the wiring can be drawn out to the peripheral part.

また、発光素子用の複数の配線は、透光性基板を挟んで相互に重なって配置される部分を有する。つまり、その部分では、多層基板の構造になる。これにより、透光性基板において配線によって光の経路が妨げられる部分が抑制でき、より効率的に光を受光素子に集めることができる。   In addition, the plurality of wirings for the light-emitting element have portions that are arranged to overlap each other with the light-transmitting substrate interposed therebetween. That is, in that portion, the structure is a multilayer substrate. As a result, the portion of the translucent substrate where the light path is hindered by the wiring can be suppressed, and light can be more efficiently collected in the light receiving element.

また、受光素子を搭載する受光素子基板は、取付部を有し、この取付部によって透光性基板の周辺部が位置決めされて受光素子基板に取り付けられる。これにより、樹脂封止等を用いることに比較して簡単な構造で、受光素子の上面に発光素子を位置決めして配置することができる。   Further, the light receiving element substrate on which the light receiving element is mounted has an attachment portion, and the peripheral portion of the translucent substrate is positioned by this attachment portion and attached to the light receiving element substrate. Accordingly, the light emitting element can be positioned and arranged on the upper surface of the light receiving element with a simple structure as compared to using resin sealing or the like.

また、受光素子基板には、発光素子用の複数の引出配線が取付部を通って設けられ、透光性基板の周辺部が取付部に電気的に接続されて取り付けられる。したがって、受光素子基板に透光性基板を取り付けることで、容易に発光素子の各端子を受光素子基板の引出線に接続することができる。   The light receiving element substrate is provided with a plurality of lead wires for the light emitting element through the attachment portion, and the peripheral portion of the translucent substrate is electrically connected to the attachment portion. Therefore, by attaching the light transmitting substrate to the light receiving element substrate, each terminal of the light emitting element can be easily connected to the lead line of the light receiving element substrate.

また、受光素子基板の一方側の面に受光素子が搭載され、反対側の裏面側に電子回路が実装されるので、反射型光センサの小型化を図ることができる。   In addition, since the light receiving element is mounted on one surface of the light receiving element substrate and the electronic circuit is mounted on the opposite back surface side, the reflective photosensor can be reduced in size.

また、受光素子と発光素子とを覆って、発光素子からの光を外部に導き、外部からの反射光を受光素子に導く光学的カバー素子を含むので、これにより効率的に受光素子から放射されて対象物から反射されてくる光を効率よく受光素子に集めることができる。   In addition, it includes an optical cover element that covers the light receiving element and the light emitting element, guides the light from the light emitting element to the outside, and guides the reflected light from the outside to the light receiving element, thereby efficiently radiating from the light receiving element. Thus, the light reflected from the object can be efficiently collected on the light receiving element.

また、光学的カバー素子は、窓部を除いて光の出入りを制限する遮光部を有するので、不要なノイズ光等が受光素子に入ることを抑制することができる。   In addition, since the optical cover element has a light-shielding part that restricts the entry and exit of light except for the window part, unnecessary noise light and the like can be prevented from entering the light-receiving element.

本発明に係る実施の形態における反射型光センサの平面図である。It is a top view of the reflection type photosensor in an embodiment concerning the present invention. 本発明に係る実施の形態における反射型光センサの正面断面図である。It is front sectional drawing of the reflection type optical sensor in embodiment which concerns on this invention. 本発明に係る実施の形態における反射型光センサの側面断面図である。It is side surface sectional drawing of the reflection type optical sensor in embodiment which concerns on this invention. 本発明に係る実施の形態における反射型光センサの回路構成図である。It is a circuit block diagram of the reflection type photosensor in embodiment which concerns on this invention. 本発明に係る実施の形態において、受光素子が搭載された状態の回路基板の平面図である。In embodiment which concerns on this invention, it is a top view of the circuit board in the state in which the light receiving element was mounted. 本発明に係る実施の形態において、発光素子が搭載された透光性基板の平面展開図である。In embodiment which concerns on this invention, it is a plane expanded view of the translucent board | substrate with which the light emitting element was mounted. 本発明に係る実施の形態において、発光素子と、発光素子用配線との接続部の断面拡大図である。In embodiment which concerns on this invention, it is a cross-sectional enlarged view of the connection part of a light emitting element and the wiring for light emitting elements. 本発明に係る実施の形態において、発光素子と、発光素子用配線との接続部の平面拡大図である。In embodiment which concerns on this invention, it is a plane enlarged view of the connection part of a light emitting element and the wiring for light emitting elements. 本発明に係る実施の形態において、遮光板の部分の拡大図である。In embodiment which concerns on this invention, it is an enlarged view of the part of a light-shielding plate. 本発明に係る実施の形態において、遮光のために、光反射材を透光性基板と受光素子との間に配置する例を示す図である。In embodiment which concerns on this invention, it is a figure which shows the example which arrange | positions a light reflection material between a translucent board | substrate and a light receiving element for light shielding. 本発明に係る実施の形態において、遮光のために、凹面を有する透光性基板を用いる例を示す図である。In embodiment which concerns on this invention, it is a figure which shows the example which uses the translucent board | substrate which has a concave surface for light shielding. 本発明に係る実施の形態において、透光性基板の変形例を説明する図である。In embodiment which concerns on this invention, it is a figure explaining the modification of a translucent board | substrate. 本発明に係る実施の形態において、透光性基板の他の変形例を説明する図である。In embodiment which concerns on this invention, it is a figure explaining the other modification of a translucent board | substrate. 本発明に係る実施の形態において、透光性基板の別の変形例を説明する図である。In embodiment which concerns on this invention, it is a figure explaining another modification of a translucent board | substrate. 本発明に係る実施の形態において、カバー筐体の変形例を説明する図である。In embodiment which concerns on this invention, it is a figure explaining the modification of a cover housing | casing. 本発明に係る実施の形態において、カバー筐体の他の変形例を説明する図である。In embodiment which concerns on this invention, it is a figure explaining the other modification of a cover housing | casing. 本発明に係る実施の形態において、カバー筐体の別の変形例を説明する図である。In embodiment which concerns on this invention, it is a figure explaining another modification of a cover housing | casing. 他の実施の形態に係る反射型光センサの平面図である。It is a top view of the reflective optical sensor which concerns on other embodiment. 他の実施の形態に係る反射型光センサの正面断面図である。It is front sectional drawing of the reflection type optical sensor which concerns on other embodiment. 他の実施の形態に係る反射型光センサの側面断面図である。It is side surface sectional drawing of the reflection type optical sensor which concerns on other embodiment. 他の実施の形態において、透光性基板の展開詳細図である。In other embodiment, it is an expansion | deployment detailed drawing of a translucent board | substrate. 他の実施の形態において、発光素子、透光性基板、リフレクタの関係を示す模式的斜視図である。In other embodiment, it is a typical perspective view which shows the relationship between a light emitting element, a translucent board | substrate, and a reflector. 他の実施の形態において、リフレクタ近傍の拡大図である。In other embodiment, it is an enlarged view of the reflector vicinity. 別の実施の形態に係る反射型光センサの構成を示す図である。It is a figure which shows the structure of the reflection type optical sensor which concerns on another embodiment. 別の実施の形態において、透光性基板の例を示す図である。In another embodiment, it is a figure which shows the example of a translucent board | substrate. 別の実施の形態において、透光性基板の他の例を示す図である。In another embodiment, it is a figure which shows the other example of a translucent board | substrate.

符号の説明Explanation of symbols

8 対象物、10,160,200 反射型光センサ、20,130,162,202 カバー筐体、21 収納空間、22,124,204 遮光膜、24 シールド蓋、50,210 回路基板、52,53 取付部、54,55,56,57 接続部、60 受光素子、61 受光領域、62 遮光板、70 電子回路、79,81,110,111 折曲線、80,100,102,120,106,170,220,230 透光性基板、82 発光素子、84,85 バンプ端子、90,91,121,122,172,173 発光素子用配線、92 スルーホール、94,95,96,97,174,175 接続用パターン、104 固定位置、108,109 抜穴部、118 光反射材、132,136 くぼみ、134,138 凸部、164 裏蓋、180 リフレクタ。   8 Object 10, 160, 200 Reflective optical sensor 20, 130, 162, 202 Cover housing, 21 Storage space, 22, 124, 204 Light shielding film, 24 Shield lid, 50, 210 Circuit board, 52, 53 Mounting part, 54, 55, 56, 57 Connection part, 60 Light receiving element, 61 Light receiving area, 62 Light shielding plate, 70 Electronic circuit, 79, 81, 110, 111 Folding curve, 80, 100, 102, 120, 106, 170 220, 230 Translucent substrate, 82 Light emitting element, 84, 85 Bump terminal, 90, 91, 121, 122, 172, 173 Light emitting element wiring, 92 Through hole, 94, 95, 96, 97, 174, 175 Connection pattern, 104 fixed position, 108,109 hole, 118 light reflector, 132,136 indent, 134,138 convex , 164 back lid 180 reflector.

以下に図面を用いて本発明に係る実施の形態に付き詳細に説明する。なお、以下で説明する寸法、材質等は説明のための一例であって、反射型光センサの仕様、目的等に応じ、適宜変更することができる。   Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the dimensions, materials, and the like described below are examples for explanation, and can be appropriately changed according to the specifications, purposes, and the like of the reflective optical sensor.

[実施例1]
図1は反射型光センサ10の平面図、図2はその正面断面図、図3は側面断面図である。図4は、反射型光センサ10を電子部品として把握するときの回路構成図である。なお、図3、図4には、反射型光センサ10の構成要素ではないが、センシングの対象である対象物8が破線で示されている。また、図1においては、一部破断図として、内部構成が図示されている。
[Example 1]
1 is a plan view of the reflective optical sensor 10, FIG. 2 is a front sectional view thereof, and FIG. 3 is a side sectional view thereof. FIG. 4 is a circuit configuration diagram when the reflective optical sensor 10 is grasped as an electronic component. In FIGS. 3 and 4, although not a component of the reflective optical sensor 10, the object 8 that is a sensing target is indicated by a broken line. Moreover, in FIG. 1, an internal structure is illustrated as a partially broken view.

図4に示されるように、反射型光センサ10は、対象物8に発光素子82から光を当て、対象物8からの反射光を受光素子60で受けて、対象物の位置、変位、物性等を検出するために用いられる電子部品である。そのために、反射型光センサ10は、受光素子60によって検出される信号を増幅し、外部に出力するための適当な電子回路70を内蔵する。ここで、電子回路70とは、図4に示される電子部品のうち発光素子82と受光素子60を除いた増幅回路、抵抗素子、容量素子等を接続して構成される回路である。電子回路70は、1つのパッケージでまとめられたICとして構成することもでき、増幅器部分をICとし、抵抗素子、容量素子を外付部品としてこれらを回路基板上に配置接続したものとすることもできる。   As shown in FIG. 4, the reflection type optical sensor 10 applies light from the light emitting element 82 to the object 8 and receives the reflected light from the object 8 by the light receiving element 60, so that the position, displacement, and physical properties of the object are detected. It is an electronic component used for detecting the like. For this purpose, the reflection type optical sensor 10 includes a suitable electronic circuit 70 for amplifying a signal detected by the light receiving element 60 and outputting the amplified signal to the outside. Here, the electronic circuit 70 is a circuit configured by connecting an amplifier circuit, a resistor element, a capacitor element, and the like excluding the light emitting element 82 and the light receiving element 60 among the electronic components shown in FIG. The electronic circuit 70 can also be configured as an IC integrated in a single package, and the amplifier portion can be an IC, and a resistance element and a capacitance element can be externally mounted and arranged on a circuit board. it can.

発光素子82は、電気信号によって光を放射するデバイスで、半導体素子としての発光ダイオード(Light Emission Device:LED)を用いることができる。また、受光素子60は、光を受けて電気信号を出力するデバイスで、例えばフォトダイオード、あるいはフォトトランジスタを用いることができる。図4では、2端子素子であるフォトダイオードが用いられている。   The light-emitting element 82 is a device that emits light by an electrical signal, and a light-emitting diode (LED) as a semiconductor element can be used. The light receiving element 60 is a device that receives light and outputs an electrical signal. For example, a photodiode or a phototransistor can be used. In FIG. 4, a photodiode that is a two-terminal element is used.

図4に示されるように、反射型光センサ10は、端子として、接地端子であるGND、電源端子であるVdd、発光素子82に駆動信号を入力するLED1,LED2、増幅器のゲイン等を調整する調整端子であるVR1,VR2、出力端子であるOUTを有する電子部品である。かかる反射型光センサ10は、図示されていない適当な制御部にこれらの各端子が接続され、制御部の制御の下で発光素子82が駆動されて発光し、その光が対象物8に当てられて反射してきた光を受光素子60で受け、適当に増幅されて出力信号として出力端子OUTから制御部に入力される。制御部では、取得した出力信号を処理して、例えば、対象物8の変位量等を算出する。このようにして、反射型光センサ10は作動する。   As shown in FIG. 4, the reflection type optical sensor 10 adjusts GND as a ground terminal, Vdd as a power supply terminal, LEDs 1 and 2 for inputting a drive signal to the light emitting element 82, gain of an amplifier, and the like as terminals. It is an electronic component having VR1 and VR2 as adjustment terminals and OUT as an output terminal. In the reflection type optical sensor 10, each of these terminals is connected to an appropriate control unit (not shown), and the light emitting element 82 is driven to emit light under the control of the control unit, and the light strikes the object 8. The reflected light is received by the light receiving element 60, appropriately amplified, and input as an output signal from the output terminal OUT to the control unit. The control unit processes the acquired output signal to calculate, for example, a displacement amount of the object 8. In this way, the reflective photosensor 10 operates.

ここで再び図1から図3に戻り、反射型光センサ10は、上面側に光が通る窓部を有し下部に収納空間21を有するカバー筐体20と、カバー筐体20の下部の収納空間21の開口を覆うシールド蓋24とを含み、収納空間21に、回路基板50、受光素子60、遮光板62、電子回路70、透光性基板80、発光素子82等が収納配置される。なお、回路基板50は、収納空間21からカバー筐体20の外部に引き出され、図示されていない制御部に接続される。   Here, referring again to FIGS. 1 to 3, the reflective optical sensor 10 includes a cover housing 20 having a window portion through which light passes on the upper surface side and a storage space 21 in the lower portion, and a lower housing of the cover housing 20. The circuit board 50, the light receiving element 60, the light shielding plate 62, the electronic circuit 70, the translucent substrate 80, the light emitting element 82, and the like are accommodated in the accommodation space 21. The circuit board 50 is pulled out of the cover housing 20 from the storage space 21 and connected to a control unit (not shown).

カバー筐体20は、シールド蓋24と協働して各種要素を収納する収納空間21を形成する筐体としての機能と、収納空間21に収納された発光素子82からの光を外部の対象物8に向けて導き、外部の対象物8からの反射光を受光素子60に導く光学的カバー素子の機能を併せ持つ部品である。カバー筐体20は、図1の例では、略矩形の上面板部と、略矩形環状の下部脚部とから構成される。上面板部と下部脚部とは図2、図3に示されるように一体として構成することもでき、場合によっては別個の部品として構成してこれらを組み立て、あるいは接合等によって、一体化されたカバー筐体20とすることもできる。   The cover housing 20 functions as a housing for forming a storage space 21 for storing various elements in cooperation with the shield lid 24, and transmits light from the light emitting element 82 stored in the storage space 21 to an external object. 8 is a component that also has a function of an optical cover element that guides toward the light 8 and guides the reflected light from the external object 8 to the light receiving element 60. In the example of FIG. 1, the cover housing 20 includes a substantially rectangular upper surface plate portion and a substantially rectangular annular lower leg portion. As shown in FIGS. 2 and 3, the upper plate portion and the lower leg portion can be configured as a single unit. In some cases, the upper plate unit and the lower leg unit are configured as separate parts and assembled or joined together. The cover housing 20 can also be used.

かかるカバー筐体20は、透光性材料を用いて加工、あるいは成形によって得ることができる。透光性材料としては、光を通すプラスチック材料、ガラス等を用いることができる。例えば、透明のアクリル材料を用いて成形したものを用いることができる。透明でなくても、センシングに用いる光の波長を通す材料であればよい。例えば、黄色、橙色、赤色、青色、緑色等の指定波長に対する透光性を有するガラス、プラスチック等を用いることができる。   Such a cover housing 20 can be obtained by processing or molding using a translucent material. As the light-transmitting material, a plastic material that transmits light, glass, or the like can be used. For example, what was shape | molded using the transparent acrylic material can be used. Even if it is not transparent, any material that transmits the wavelength of light used for sensing may be used. For example, glass, plastic, or the like having translucency with respect to a specified wavelength such as yellow, orange, red, blue, or green can be used.

カバー筐体20の上面板部は、その中央部において底面側が発光素子82の上面に接し、基本的に厚みが一様な平行平板である。発光素子82から離れた周辺部において、上面板部の上面側には、遮光膜22が配置される。遮光膜22は、窓部を除いて光の出入りを制限する遮光部であって、図1では、カバー筐体20の上面の中央部に、遮光膜22が配置されない矩形の窓部が設けられ、この窓部のみが光の出入りが可能である。この窓部を除き、図1において、窓部の周囲の斜線を付した部分には遮光膜22が設けられ、遮光性を有する。すなわち、窓部を除いて、カバー筐体20の内部の光は外に漏れることが抑制され、外部からの光は、窓部を除いて、カバー筐体20の内部に入り込むことが制限される。かかる遮光膜22としては適当な金属膜、例えばアルミニウム膜を用いることができ、また、黒色塗料等を用いることができる。前者の場合には、遮光膜22は光反射膜として働き、後者の場合には光吸収膜として機能する。   The upper surface plate portion of the cover housing 20 is a parallel flat plate that basically has a uniform thickness with the bottom surface in contact with the upper surface of the light emitting element 82 at the center. In the peripheral portion away from the light emitting element 82, the light shielding film 22 is disposed on the upper surface side of the upper surface plate portion. The light-shielding film 22 is a light-shielding part that restricts the entrance and exit of light except for the window part. In FIG. 1, a rectangular window part in which the light-shielding film 22 is not disposed is provided at the center of the upper surface of the cover housing 20. Only this window part allows light to enter and exit. Except for this window part, in FIG. 1, a light shielding film 22 is provided in the hatched part around the window part, and has a light shielding property. That is, the light inside the cover housing 20 is prevented from leaking outside except for the window portion, and the light from the outside is restricted from entering the inside of the cover housing 20 except for the window portion. . As the light shielding film 22, an appropriate metal film such as an aluminum film can be used, and a black paint or the like can be used. In the former case, the light shielding film 22 functions as a light reflecting film, and in the latter case, it functions as a light absorbing film.

カバー筐体20の下面は、上記のように矩形環状の下部脚部で、その環状の内側が、各種要素が収納配置される収納空間21として用いられる。シールド蓋24は、カバー筐体20の下部脚部と組み合わされて収納空間21を形成する蓋機能と、金属材料を用いることで収納空間21に配置される電子回路等を電磁ノイズから保護するノイズ遮蔽板としての機能を有する。かかるシールド蓋24は、適当な厚さの磁性材料で構成される板材を加工して得ることができる。   The lower surface of the cover housing 20 is a rectangular annular lower leg portion as described above, and the inner side of the annular shape is used as a storage space 21 in which various elements are stored and arranged. The shield lid 24 is a noise which protects the electronic circuit etc. which are arrange | positioned in the storage space 21 from electromagnetic noise by using the lid function which combines with the lower leg part of the cover housing | casing 20, and forms the storage space 21, and using a metal material. It functions as a shielding plate. Such a shield lid 24 can be obtained by processing a plate made of a magnetic material having an appropriate thickness.

収納空間21に配置され、カバー筐体20の外側に引き出される回路基板50は、反射型光センサ10を構成する電子部品等が搭載される電子回路基板である。回路基板50の上面には、受光素子60が配置され、下面には電子回路70が配置される。この意味から、回路基板50は、受光素子基板と呼ぶこともできる。実際には、回路基板50には発光素子82が搭載される透光性基板80も取り付けられるので、反射型光センサ10の主回路基板としての性格を有している。   The circuit board 50 disposed in the storage space 21 and pulled out to the outside of the cover housing 20 is an electronic circuit board on which electronic components constituting the reflective optical sensor 10 are mounted. A light receiving element 60 is disposed on the upper surface of the circuit board 50, and an electronic circuit 70 is disposed on the lower surface. In this sense, the circuit board 50 can also be called a light receiving element board. Actually, the circuit board 50 is also attached with a translucent substrate 80 on which the light emitting element 82 is mounted, and thus has a character as a main circuit board of the reflection type optical sensor 10.

回路基板50は、一方端側がカバー筐体20の下部脚部の矩形環状の縁に沿って取り付けられ、接着等の適当な固定手段によって固定される。回路基板50は、カバー筐体20の下部脚部に設けられた適当な引出隙間から外部に引き出され、他方端部において、図示されていない外部制御部等と接続するための接続端子部が設けられる。かかる回路基板50としては、両面フレキシブル回路基板を用いることができる。もちろん、ガラスエポキシ回路基板等を用いることもできる。   One end side of the circuit board 50 is attached along the rectangular annular edge of the lower leg portion of the cover housing 20, and is fixed by an appropriate fixing means such as adhesion. The circuit board 50 is pulled out from an appropriate pull-out gap provided in the lower leg portion of the cover housing 20, and a connection terminal portion is provided at the other end portion to connect to an external control unit not shown. It is done. As such a circuit board 50, a double-sided flexible circuit board can be used. Of course, a glass epoxy circuit board or the like can also be used.

図5は、受光素子60が搭載された状態の回路基板50の平面図である。なお、以下では図1から図4の符号を用いて説明する。ここでは、図1で説明したカバー筐体20に取り付けられる部分を主体に示されている。なお、回路基板は、図4で説明したような回路構成図に対応する配線パターンが設けられているが、図5では接続部54,55,56,57を除いて配線パターンの図示を省略してある。   FIG. 5 is a plan view of the circuit board 50 on which the light receiving element 60 is mounted. In the following, description will be made using the reference numerals in FIGS. Here, the portion attached to the cover housing 20 described in FIG. 1 is mainly shown. The circuit board is provided with a wiring pattern corresponding to the circuit configuration diagram described with reference to FIG. 4, but the wiring pattern is not shown in FIG. 5 except for the connecting portions 54, 55, 56, and 57. It is.

回路基板50には、切り込みである取付部52,53が設けられる。取付部52,53は、透光性基板80の端部を挿入するための切り込みである。また、取付部52,53のところに、接続部54,55,56,57が設けられる。接続部54,55,56,57は、回路基板50において図5では図示されていない配線パターンと同じ材料で構成されている導電パターンで、半田付けが可能なパターンである。そして、接続部54,55は、発光素子82の2端子に接続されるもので、ここから配線パターンが回路基板50の他方端、すなわち外部の制御部への接続端まで延長される。すなわち、接続部54,55は、図4におけるLED1,LED2に接続される端子である。なお、接続部56,57は、他の要素に接続されることもなく、孤立した導電パターンである。   The circuit board 50 is provided with mounting portions 52 and 53 which are cuts. The attachment portions 52 and 53 are cuts for inserting the end portions of the translucent substrate 80. In addition, connection portions 54, 55, 56, and 57 are provided at the attachment portions 52 and 53. The connection portions 54, 55, 56, and 57 are conductive patterns made of the same material as the wiring pattern not shown in FIG. 5 on the circuit board 50, and are solderable patterns. The connecting portions 54 and 55 are connected to the two terminals of the light emitting element 82, and the wiring pattern is extended from here to the other end of the circuit board 50, that is, the connecting end to the external control unit. That is, the connection parts 54 and 55 are terminals connected to the LEDs 1 and 2 in FIG. The connection portions 56 and 57 are isolated conductive patterns without being connected to other elements.

後述するように、挿入された透光性基板80の端部には接続用パターン94,95,96,97が設けられているので、これらの接続用パターンと、回路基板50の接続部54,55,56,57との間を半田付けによって接続固定することで、回路基板50に透光性基板80が位置決めされて配置され固定される。   As will be described later, connection patterns 94, 95, 96, and 97 are provided at the end of the inserted translucent substrate 80, so that these connection patterns are connected to the connection portions 54 and 54 of the circuit board 50. By connecting and fixing between 55, 56, and 57 by soldering, the translucent substrate 80 is positioned, arranged, and fixed to the circuit board 50.

図5において示される受光素子60は、光を受けて電気信号を出力するデバイスで、上記のようにフォトダイオードが用いられる。受光素子60は、回路基板50の上面側に、受光面を上面側に向けて配置される。ここで上面側とは、図3で示されるように、対象物8に向かう側の面の側である。換言すれば、回路基板50の上面側とは、対象物8に向かい合う面の側であり、受光素子60は、受光面を対象物8に向かい合うようにして、回路基板50の上面側に配置される。   The light receiving element 60 shown in FIG. 5 is a device that receives light and outputs an electrical signal, and a photodiode is used as described above. The light receiving element 60 is arranged on the upper surface side of the circuit board 50 with the light receiving surface facing the upper surface side. Here, as shown in FIG. 3, the upper surface side is a surface side toward the object 8. In other words, the upper surface side of the circuit board 50 is the surface side facing the object 8, and the light receiving element 60 is disposed on the upper surface side of the circuit board 50 with the light receiving surface facing the object 8. The

受光素子60は、半導体ウェファから切り出されたチップの形態の場合、平面寸法の全領域に渡って光に感じて電気信号を出力する。しかし、チップの周辺は、チップの中央部と異なるので、一般的には、チップの周辺部分を除いた領域が受光領域として扱われる。図5では、受光領域61が破線で示されている。   When the light receiving element 60 is in the form of a chip cut out from a semiconductor wafer, the light receiving element 60 feels light over the entire area of the planar size and outputs an electrical signal. However, since the periphery of the chip is different from the central part of the chip, generally, the area excluding the peripheral part of the chip is treated as the light receiving area. In FIG. 5, the light receiving region 61 is indicated by a broken line.

受光素子60の受光領域61の広さは、その上に配置される発光素子82の平面寸法に比べ、格段に大きいことが望ましい。ここで格段に大きいとは、受光領域61の面積Aに比べ、発光素子82によって受光が制限される面積aが、相当小さく、発光素子82によって受光が制限されても、出力信号にあまり影響を及ぼさない程度であることを意味する。具体的には、出力信号の影響で10%以下程度であることが望ましい。出力信号の大きさが受光面積に比例するとすれば、Aは、aの10倍以上あればよいことになる。A/aの大きさは、反射型光センサ10の用途によって設定することができるが、上記のように、A/a=10を目安として、A/aを5以上、好ましくは20以上とすることが好ましい。上限は特にないが、実用上は、数100程度が限度であると考えられる。   It is desirable that the width of the light receiving region 61 of the light receiving element 60 is much larger than the planar dimension of the light emitting element 82 disposed thereon. Here, the remarkably large is that the area a in which light reception is restricted by the light emitting element 82 is considerably smaller than the area A of the light receiving region 61, and even if the light reception is restricted by the light emitting element 82, the output signal is not much affected. It means that it does not reach. Specifically, it is preferably about 10% or less due to the influence of the output signal. If the magnitude of the output signal is proportional to the light receiving area, A needs to be 10 times or more of a. The size of A / a can be set depending on the application of the reflective optical sensor 10, but as described above, A / a is 5 or more, preferably 20 or more, with A / a = 10 as a guideline. It is preferable. There is no particular upper limit, but it is considered that the practical limit is about several hundreds.

なお、発光素子82によって受光が制限される面積aとは、発光素子82の平面寸法、すなわち平面図における投影面積のみならず、発光素子82と受光素子60との間に配置される遮光板62の大きさ、透光性基板80に配線される発光素子用配線の大きさ等を考慮した面積である。例えば、受光素子60を4mm角程度とし、発光素子82を1mm角とすれば、素子面積比で16倍であり、その他の影響を計算に入れても、A/aを5以上10程度とすることは可能である。発光素子82を0.2mm角とすれば、素子面積比で400倍であり、その他の影響を計算に入れても、A/aを10以上とすることは容易である。   Note that the area a in which light reception is restricted by the light emitting element 82 is not only the planar size of the light emitting element 82, that is, the projected area in the plan view, but also the light shielding plate 62 disposed between the light emitting element 82 and the light receiving element 60. This is an area that takes into account the size of the light-emitting element and the size of the wiring for the light-emitting element wired on the translucent substrate 80. For example, if the light receiving element 60 is about 4 mm square and the light emitting element 82 is 1 mm square, the element area ratio is 16 times, and A / a is about 5 to 10 even if other effects are taken into account. It is possible. If the light emitting element 82 is 0.2 mm square, the element area ratio is 400 times, and even if other influences are taken into account, it is easy to set A / a to 10 or more.

図6は、発光素子82が搭載された透光性基板80の平面展開図である。なお、以下では、図1から図5の符号を用いて説明する。透光性基板80は、受光素子60の上面に発光素子82を配置するための回路基板であり、また、できるだけ、受光素子60に入る光の経路を妨げないように、透光性材料で構成される基板である。すなわち、透光性基板80は、受光素子60の受光面積を極力制限しないように発光素子82を支持して発光素子82の上面に配置する機能を有する支持基板である。また、発光素子82の端子を受光素子60の外側に引き出すための配線機能を有する配線基板でもある。   FIG. 6 is a plan development view of the translucent substrate 80 on which the light emitting element 82 is mounted. In the following, description will be made using the reference numerals in FIGS. The translucent substrate 80 is a circuit board for disposing the light emitting element 82 on the upper surface of the light receiving element 60, and is made of a translucent material so as not to obstruct the path of light entering the light receiving element 60 as much as possible. The substrate to be processed. In other words, the translucent substrate 80 is a support substrate having a function of supporting the light emitting element 82 and arranging it on the upper surface of the light emitting element 82 so as not to limit the light receiving area of the light receiving element 60 as much as possible. Further, it is also a wiring board having a wiring function for drawing out the terminal of the light emitting element 82 to the outside of the light receiving element 60.

透光性基板80は、図6で示される折曲線79,81において、折り曲げられる。折り曲げは、透光性基板80の両面のうち、発光素子82が搭載される側の面を上面として、両端部が下面側に向かって略90度の角度となるように行われる。すなわち、上面を平坦面として、平坦面の両端側が脚状に下側に折り曲げられたブリッジ形状となる。なお、図2には、透光性基板80の折り曲げた後の形状が示されている。   The translucent substrate 80 is bent at folding lines 79 and 81 shown in FIG. The bending is performed such that, of both surfaces of the translucent substrate 80, the surface on which the light emitting element 82 is mounted is the upper surface, and both end portions are at an angle of approximately 90 degrees toward the lower surface side. That is, a bridge shape is formed in which the upper surface is a flat surface and both end sides of the flat surface are bent downward in a leg shape. Note that FIG. 2 shows a shape of the translucent substrate 80 after being bent.

折り曲げられた両端部は、図5で説明したように、回路基板50の切り込みである取付部52,53にそれぞれ挿入される。なお、図6には、透光性基板80が回路基板50に取り付けられたときの受光素子60とその受光領域61の配置位置が破線で示されている。これから分かるように、透光性基板80が回路基板50に取り付けられたとき、発光素子82は、受光素子60の受光領域61のほぼ中央に来る。この配置になるように、透光性基板80において、発光素子用配線90,91、接続用パターン94,95、折曲線79,81の配置関係が設定されることになる。このように、回路基板50の取付部52,53を用いて、透光性基板80は、その両端部である周辺部において回路基板50と位置決めされ、取り付けられる。   The bent both ends are inserted into attachment portions 52 and 53 which are cuts of the circuit board 50 as described with reference to FIG. In FIG. 6, the arrangement positions of the light receiving element 60 and the light receiving region 61 when the translucent substrate 80 is attached to the circuit board 50 are indicated by broken lines. As can be seen from this, when the translucent substrate 80 is attached to the circuit board 50, the light emitting element 82 comes to substantially the center of the light receiving region 61 of the light receiving element 60. In the translucent substrate 80, the arrangement relationship of the light emitting element wirings 90 and 91, the connection patterns 94 and 95, and the folding lines 79 and 81 is set so as to achieve this arrangement. As described above, the translucent board 80 is positioned and attached to the circuit board 50 at the peripheral portions that are both ends thereof by using the mounting portions 52 and 53 of the circuit board 50.

また、透光性基板80は、発光素子82の端子を引き出すための発光素子用配線90,91を有する。発光素子82として上記のようにLEDを用いるときは、発光素子82の端子は2つであるので、発光素子用配線90,91は2本で構成される。発光素子用配線90,91は、一端側が透光性基板80の中央部に配置されて発光素子82の2つの端子とそれぞれ接続され、他端側が透光性基板80の周辺部にそれぞれ配置される。図6においては、他端側の端子として、接続用パターン94,95が示されている。接続用パターン94,95は、導電パターンであると共に半田付け可能なパターンである。接続用パターン94,95は、図5で説明した接続部54,55に対応するもので、半田付け等でこれらが相互に電気的に接続し固定されることで、発光素子82の2端子が、回路基板50の接続部54,55と固定接続されることになる。   The translucent substrate 80 includes light emitting element wirings 90 and 91 for drawing out the terminals of the light emitting element 82. When an LED is used as the light emitting element 82 as described above, since the light emitting element 82 has two terminals, the light emitting element wirings 90 and 91 are constituted by two. The light emitting element wirings 90 and 91 are arranged at one end side at the central portion of the translucent substrate 80 and connected to the two terminals of the light emitting element 82, respectively, and at the other end side at the peripheral portion of the translucent substrate 80. The In FIG. 6, connection patterns 94 and 95 are shown as terminals on the other end side. The connection patterns 94 and 95 are conductive patterns and solderable patterns. The connection patterns 94 and 95 correspond to the connection portions 54 and 55 described in FIG. 5, and are electrically connected and fixed to each other by soldering or the like, so that the two terminals of the light emitting element 82 can be connected. The connection parts 54 and 55 of the circuit board 50 are fixedly connected.

透光性基板80には、発光素子82の2端子に接続される接続用パターン94,95の他に、透光性基板80の中央部を対称の中心として、接続用パターン94,95と対称の位置に、さらに2つの接続用パターン96,97が配置されている。この2つの接続用パターン96,97は、発光素子82を含んで他の要素に接続されていない導電パターンであり、また半田付け可能なパターンである。この接続用パターン96,97は、図5で説明した接続部56,57に対応するもので、半田付け等でこれらが相互に接続固定されることで、先ほどの接続用パターン94,95と接続部54,55の半田付け接続固定とあいまって、透光性基板80が回路基板50に位置決めされて固定される。   In addition to the connection patterns 94 and 95 connected to the two terminals of the light emitting element 82, the translucent substrate 80 is symmetrical with the connection patterns 94 and 95 with the central portion of the translucent substrate 80 as the center of symmetry. Two further connection patterns 96 and 97 are arranged at the position. The two connection patterns 96 and 97 are conductive patterns that are not connected to other elements including the light emitting element 82, and are solderable patterns. The connection patterns 96 and 97 correspond to the connection portions 56 and 57 described with reference to FIG. 5, and are connected and fixed to each other by soldering or the like, so that the connection patterns 94 and 95 are connected. Combined with the soldering connection fixing of the portions 54 and 55, the translucent substrate 80 is positioned and fixed to the circuit board 50.

図7A、図7Bは、発光素子82と、発光素子用配線90,91との接続部の拡大図である。図7Aは断面拡大図、図7Bは平面拡大図である。なお図7Bは、発光素子82を一部破断し、発光素子用配線90,91を見やすくして示してある。発光素子用配線90,91は、透光性基板80の上下両面に配線される。具体的には、図7Bに示されるように、発光素子82が接続される部分においては、発光素子用配線90と、発光素子用配線91は、共に、透光性基板80の上面側に配置される。そして、一方側の配線が、図7A、図7Bの例では、発光素子用配線91が、スルーホール92を介して、透光性基板80の裏面側に回って配線される。この状態において、発光素子用配線90が透光性基板80の上面側に配置され、発光素子用配線91が透光性基板80の下面側、すなわち発光素子用配線90が配置される面とは反対側の裏面側に配置される。   7A and 7B are enlarged views of a connection portion between the light emitting element 82 and the light emitting element wirings 90 and 91. 7A is an enlarged cross-sectional view, and FIG. 7B is an enlarged plan view. In FIG. 7B, the light emitting element 82 is partly broken to make the light emitting element wirings 90 and 91 easier to see. The light emitting element wirings 90 and 91 are wired on both upper and lower surfaces of the translucent substrate 80. Specifically, as shown in FIG. 7B, in the portion to which the light emitting element 82 is connected, the light emitting element wiring 90 and the light emitting element wiring 91 are both arranged on the upper surface side of the translucent substrate 80. Is done. 7A and 7B, the light-emitting element wiring 91 is routed around the back surface side of the translucent substrate 80 through the through hole 92. In this state, the light emitting element wiring 90 is disposed on the upper surface side of the light transmitting substrate 80, and the light emitting element wiring 91 is the lower surface side of the light transmitting substrate 80, that is, the surface on which the light emitting element wiring 90 is disposed. Arranged on the opposite back side.

そして、上面側の発光素子用配線90と、下面側の発光素子用配線91とは、透光性基板80を挟んで相互に重なって配置される。つまり、図7Bの平面図では、この2つの配線は重なって示される。このように2つの配線を透光性基板80を挟んで相互に重なるように配置することで、配線によって受光素子60の受光領域61の受光面積が制限されることを抑制することができる。   The light emitting element wiring 90 on the upper surface side and the light emitting element wiring 91 on the lower surface side are arranged so as to overlap each other with the translucent substrate 80 interposed therebetween. That is, in the plan view of FIG. 7B, these two wirings are shown overlapping. By arranging the two wirings so as to overlap each other with the translucent substrate 80 interposed therebetween, it is possible to suppress the light receiving area of the light receiving region 61 of the light receiving element 60 from being limited by the wiring.

このようにして透光性基板80を挟んで相互に重なるようにして配置された発光素子用配線90,91は、透光性基板80の周辺部に向かって延伸される。そして、スルーホールを再び用いて、発光素子用配線91を透光性基板80の上面側に戻し、接続用パターン94,95においては、双方と透光性基板80の上面側の配置となる。   Thus, the light emitting element wirings 90 and 91 arranged so as to overlap each other with the translucent substrate 80 interposed therebetween are extended toward the periphery of the translucent substrate 80. Then, using the through holes again, the light emitting element wiring 91 is returned to the upper surface side of the translucent substrate 80, and the connection patterns 94 and 95 are arranged on the upper surface side of the translucent substrate 80.

かかる透光性基板80としては、透光性フィルムに配線パターンを形成したものを用いることができる。透光性フィルムとしては、もちろん、有色フィルムでもよく、反射型光センサ10の用途に合わせ特定の波長の光を透過するプラスチックフィルムを用いることもできる。しかし、受光素子60に効率よく光を集めるには、理想的には、透過率が100%であることが好ましい。すなわち、透明フィルムを用いることが好ましい。配線パターンを配置するのに適した透明フィルムの材料としては、透過率が約85%の透明ポリイミドフィルム、透過率が約77%の透明アラミドフィルム、透過率が約87%の透明ポリエチレンナフタレートフィルム等を用いることができる。なお、上記のように、透明フィルムであっても透過率は100%とならないので、強度等から見て必要のない部分は、透明フィルム部分を削除することがよい。   As this translucent board | substrate 80, what formed the wiring pattern in the translucent film can be used. Of course, the translucent film may be a colored film, or a plastic film that transmits light of a specific wavelength in accordance with the application of the reflective optical sensor 10 may be used. However, in order to collect light efficiently in the light receiving element 60, ideally, the transmittance is preferably 100%. That is, it is preferable to use a transparent film. The transparent film material suitable for arranging the wiring pattern includes a transparent polyimide film having a transmittance of about 85%, a transparent aramid film having a transmittance of about 77%, and a transparent polyethylene naphthalate film having a transmittance of about 87%. Etc. can be used. Note that, as described above, even if it is a transparent film, the transmittance does not become 100%. Therefore, it is preferable to delete the transparent film portion from a portion unnecessary in view of strength or the like.

次に、発光素子82と発光素子用配線90,91との間の接続について説明する。発光素子82は、電気信号によって光を放射することができるデバイスで、上記のようにLEDが用いられる。LEDは2端子素子であるが、ここでは、この2端子を外部に接続するものとしてバンプ端子84,85が用いられる。バンプ端子84,85は、発光素子82のチップ表面に配線される端子パターンの上に適当な高さの導電性材料を配置したもので、チップ表面より盛り上がった形状を有する。バンプ端子84,85の平面図における直径は、例えば0.1mm程度以下とすることができる。したがって、発光素子82の大きさは、0.2mm角程度のものでもバンプ端子84,85を形成することができる。   Next, the connection between the light emitting element 82 and the light emitting element wirings 90 and 91 will be described. The light emitting element 82 is a device that can emit light by an electrical signal, and an LED is used as described above. The LED is a two-terminal element. Here, bump terminals 84 and 85 are used to connect the two terminals to the outside. The bump terminals 84 and 85 are formed by arranging a conductive material having an appropriate height on a terminal pattern wired on the chip surface of the light emitting element 82, and have a shape raised from the chip surface. The diameter of the bump terminals 84 and 85 in the plan view can be set to about 0.1 mm or less, for example. Accordingly, the bump terminals 84 and 85 can be formed even when the light emitting element 82 has a size of about 0.2 mm square.

この2つのバンプ端子84,85を、発光素子用配線90,91のそれぞれの上に来るように位置決めし、適当な圧力の下で熱エネルギあるいは超音波エネルギを与えることで、バンプ端子84,85を発光素子用配線90,91に電気的に接続し、固定することができる。必要があれば、熱エネルギと共に超音波エネルギも与えるものとしてもよい。このように、バンプ端子を用いてチップの端子を外部配線に接続する技術は、バンプ接続技術、フリップチップ接続技術、あるいはフェースダウン接続技術等と呼ばれる。   The bump terminals 84 and 85 are positioned by positioning the two bump terminals 84 and 85 on the light emitting element wirings 90 and 91, respectively, and applying thermal energy or ultrasonic energy under an appropriate pressure. Can be electrically connected to and fixed to the light emitting element wirings 90 and 91. If necessary, ultrasonic energy may be given together with thermal energy. As described above, a technique for connecting a chip terminal to an external wiring using a bump terminal is called a bump connection technique, a flip chip connection technique, a face-down connection technique, or the like.

フェースダウン接続技術と呼ばれることから分かるように、発光素子82は、端子パターンが配線されるチップ表面を下側に向けて、バンプ端子84,85が発光素子用配線90,91と接続される。発光素子82の発光面は一般的に端子パターンが配線されるチップ表面であるので、発光素子82から放射される光は下向きとなる。すなわち、透光性基板80の上面に向かって、換言すれば、受光素子60の上面である受光面に向かって、発光素子82から光が放射されることになる。もちろん、発光素子82の側面からも底面からも一部光が放射されるが、多くの光は、受光素子60に向かって放射されることになる。   As can be seen from the face-down connection technique, the light emitting element 82 has the bump terminals 84 and 85 connected to the light emitting element wirings 90 and 91 with the chip surface on which the terminal pattern is wired facing downward. Since the light emitting surface of the light emitting element 82 is generally the chip surface on which the terminal pattern is wired, the light emitted from the light emitting element 82 faces downward. That is, light is emitted from the light emitting element 82 toward the upper surface of the translucent substrate 80, in other words, toward the light receiving surface that is the upper surface of the light receiving element 60. Of course, a part of light is emitted from the side surface and the bottom surface of the light emitting element 82, but a lot of light is emitted toward the light receiving element 60.

図6に戻って、破線で示される遮光板62は、発光素子82から下向きに放射される光が受光素子60に入り込まないようにする機能を有する部材である。その部分の拡大図を図8に示す。図8に示されるように、遮光板62は、透光性基板80と受光素子60との間であって、発光素子82の真下に配置され、その大きさは、発光素子82から放射する光が受光素子60に回り込まない程度であることを要する。かかる遮光板62としては、黒色を有する適当な光吸収板を用いることができる。   Returning to FIG. 6, the light shielding plate 62 indicated by a broken line is a member having a function of preventing light emitted downward from the light emitting element 82 from entering the light receiving element 60. An enlarged view of that portion is shown in FIG. As shown in FIG. 8, the light shielding plate 62 is disposed between the translucent substrate 80 and the light receiving element 60 and directly below the light emitting element 82, and the size thereof is the light emitted from the light emitting element 82. It is necessary that the thickness does not wrap around the light receiving element 60. As the light shielding plate 62, a suitable light absorbing plate having a black color can be used.

遮光板62の機能は、発光素子82からの下向きの光を受光素子60に入り込まないようにするものであるので、光吸収材の代わりに、光反射材を用いてもよい。図9は、光反射材118を透光性基板80と受光素子60との間に配置する例を示す図である。この場合でも光反射材118は、発光素子82の真下に配置され、その大きさは、発光素子82から放射する光が受光素子60に回り込まない程度であることを要する。かかる光反射材118としては、アルミニウム等の適当な金属板を用いることができる。光反射材118は、少なくとも発光素子82側が光反射性を有することを要するが、受光素子60側は必ずしも光反射性を有していなくてもよい。例えば、受光素子60側の面に黒色塗料等の適当な光吸収性膜を配置するものとしてもよい。   Since the function of the light shielding plate 62 is to prevent downward light from the light emitting element 82 from entering the light receiving element 60, a light reflecting material may be used instead of the light absorbing material. FIG. 9 is a diagram illustrating an example in which the light reflecting material 118 is disposed between the translucent substrate 80 and the light receiving element 60. Even in this case, the light reflecting material 118 is disposed directly under the light emitting element 82, and the size of the light reflecting material 118 needs to be such that the light emitted from the light emitting element 82 does not enter the light receiving element 60. As the light reflecting material 118, an appropriate metal plate such as aluminum can be used. The light reflecting material 118 requires that at least the light emitting element 82 side has light reflectivity, but the light receiving element 60 side does not necessarily have light reflectivity. For example, an appropriate light-absorbing film such as a black paint may be disposed on the surface on the light receiving element 60 side.

図10は、発光素子82から放射する光が受光素子60に回り込むことをさらに抑制するために、凹面を有する透光性基板120を用い、凹面のくぼみの中に発光素子82を配置し、受光素子60側の面に遮光膜124を設ける例を示す図である。遮光膜124は、光吸収材であってもよく、光反射材であってもよい。光反射材の場合は、少なくとも発光素子82側が光反射性を有していればよい。また、図10に示されるように、透光性基板120の発光素子82側の面において、発光素子用配線を広げて、凹面に沿った形状の発光素子用配線121,122とすることもできる。   In FIG. 10, in order to further suppress the light radiated from the light emitting element 82 from entering the light receiving element 60, a light-transmitting substrate 120 having a concave surface is used, and the light emitting element 82 is disposed in the concave of the concave surface. It is a figure which shows the example which provides the light shielding film 124 in the surface at the side of the element 60. FIG. The light shielding film 124 may be a light absorbing material or a light reflecting material. In the case of a light reflecting material, it is sufficient that at least the light emitting element 82 side has light reflectivity. Further, as shown in FIG. 10, the light emitting element wiring can be widened on the light emitting element 82 side surface of the translucent substrate 120 to form light emitting element wirings 121 and 122 having a shape along the concave surface. .

図6では、受光素子60の受光領域61に影響を与えることを少なくするため、発光素子用配線90,91は両面配線としたのであるが、発光素子82の近傍では、発光素子82から受光素子60へ向かう光が問題となるので、この近傍部分においては却って発光素子用配線を広げて、発光素子82からの光を遮光するものとすることができる。したがって、凹面に沿った形状の発光素子用配線121,122の隙間等によって遮光できない部分のみに、遮光膜124を設けるものとすることができる。   In FIG. 6, in order to reduce the influence on the light receiving region 61 of the light receiving element 60, the light emitting element wirings 90 and 91 are double-sided wiring. However, in the vicinity of the light emitting element 82, the light emitting element 82 to the light receiving element. Since light directed to 60 becomes a problem, the light emitting element wiring can be widened in the vicinity of the light to block light from the light emitting element 82. Therefore, the light shielding film 124 can be provided only in a portion where light cannot be shielded by a gap between the light emitting element wirings 121 and 122 having a shape along the concave surface.

なお、受光素子60の上面と透光性基板80の下面とは必ずしも固定する必要はないが、必要に応じ、適当な接着材等を用いて固定するものとしてもよい。例えば、透光性基板80と遮光板62等とを適当な接着材で固定するものとすれば、そのときに、同時に受光素子60の上面に遮光板62等を接着固定するものとしてもよい。   The upper surface of the light receiving element 60 and the lower surface of the translucent substrate 80 are not necessarily fixed, but may be fixed using an appropriate adhesive or the like as necessary. For example, if the translucent substrate 80 and the light shielding plate 62 are fixed with an appropriate adhesive, the light shielding plate 62 and the like may be simultaneously bonded to the upper surface of the light receiving element 60 at that time.

このように、平面寸法が受光素子よりも小さい発光素子を用いてこれを透光性基板の上に配置し、透光性基板を受光素子の上に配置することで、受光素子から放射されて対象物から反射されてくる光を効率よく受光素子に集めることができる。また、バンプ端子を用いて、発光素子を透光性基板上の発光素子用配線に接続することで、ワイヤボンディングを用いる従来技術に比べ、受光素子上にワイヤによる影が発生しない分、受光素子の受光面積に与える影響を抑制できる。また、複数の発光素子用配線について、透光性基板を挟んで相互に重なるように配置することで、個別に配置することに比べ、受光素子上に配線による影が減少する分、受光素子の受光面積に与える影響を抑制できる。   As described above, the light emitting element having a smaller plane dimension than the light receiving element is used to place the light emitting element on the light transmitting substrate, and the light transmitting element is disposed on the light receiving element. Light reflected from the object can be efficiently collected on the light receiving element. In addition, by connecting the light-emitting element to the light-emitting element wiring on the light-transmitting substrate using the bump terminals, the light-receiving element is less affected by the wire than the conventional technique using wire bonding. The influence on the light receiving area can be suppressed. Further, by arranging the plurality of wirings for the light emitting elements so as to overlap each other with the light-transmitting substrate interposed therebetween, the shadow of the wiring on the light receiving element is reduced as compared with the case where they are individually arranged. The influence on the light receiving area can be suppressed.

次に、透光性基板のいくつかの変形例を説明する。図11から図13は、透光性基板において、強度上で問題のない部分を削除し、受光素子60の受光領域61について、透光性フィルムで覆われる部分を少なくし、露出する部分を多くした例を示す図である。上記のように、透光性フィルムの透過率は、約70%から約80%であるから、透光性フィルムで覆われる部分が少ないほど、受光素子60の受光領域61が効果的に働くことになる。なお、以下では、図1から図10の要素と同様の要素には同一の符号を付し、詳細な説明を省略する。また、図1から図10の符号を用いて説明する。   Next, some modifications of the translucent substrate will be described. In FIGS. 11 to 13, in the translucent substrate, a portion having no problem in strength is deleted, and in the light receiving region 61 of the light receiving element 60, the portion covered with the translucent film is reduced and the exposed portion is increased. FIG. As described above, the transmissivity of the translucent film is about 70% to about 80%. Therefore, the smaller the portion covered with the translucent film, the more effectively the light receiving region 61 of the light receiving element 60 works. become. In the following, the same elements as those in FIGS. 1 to 10 are denoted by the same reference numerals, and detailed description thereof is omitted. Further, description will be made using the reference numerals in FIGS.

図11の透光性基板100は、発光素子82から4方向に延びるアーム状の部分を有し、それ以外の透光性フィルムの部分を強度上問題がないものとして削除した形状を有する。発光素子用配線と、回路基板50との接続固定のための接続用パターンは、この4方向に延びるアーム状の部分にそれぞれ配置される。   The translucent substrate 100 of FIG. 11 has an arm-shaped portion extending in four directions from the light-emitting element 82, and has a shape in which other translucent film portions are deleted as having no problem in strength. The connection pattern for fixing the connection between the light emitting element wiring and the circuit board 50 is disposed in each of the arm-shaped portions extending in the four directions.

図12の透光性基板102は、発光素子82から4方向に延びるアーム状の部分を有するが、そのうちの1つのアーム状の部分に発光素子用配線と、回路基板50との接続固定のための接続用パターンを配置するものである。そして、残りの3つは、回路基板50に取り付け固定されるのではなく、受光素子60の周辺部に位置決めされ、適当な接着材等で固定される。接着等の固定位置104は、受光素子60の受光領域61の外側であることが好ましい。   The translucent substrate 102 in FIG. 12 has arm-shaped portions extending in four directions from the light-emitting elements 82, and one arm-shaped portion of the light-transmitting substrate 102 is for fixing the connection between the light-emitting element wiring and the circuit board 50. The connection pattern is arranged. The remaining three are not attached and fixed to the circuit board 50, but are positioned at the periphery of the light receiving element 60 and fixed with an appropriate adhesive or the like. The fixing position 104 such as bonding is preferably outside the light receiving region 61 of the light receiving element 60.

図13の透光性基板106は、図6で説明した透光性基板80の基本的構成を活かし、強度的に問題のない箇所の透光性フィルムを削除したものである。すなわち、発光素子82から4方向に延びるアーム状の部分を有するようにしながら、両端部で接続されるようにし、各アームの間の透光性フィルムを削除した構成となっている。例えば、図10に示される抜穴部108,109においては透光性フィルムが削除されている。折曲線110,111の位置は、図6で説明した折曲線79,81と同じで、ここで折り曲げられた先端部が、回路基板50の取付部52,53に挿入される。   The light-transmitting substrate 106 in FIG. 13 is obtained by removing the light-transmitting film where there is no problem in strength by utilizing the basic structure of the light-transmitting substrate 80 described in FIG. That is, while having an arm-shaped portion extending in four directions from the light emitting element 82, it is connected at both ends, and the translucent film between the arms is omitted. For example, the translucent film is deleted in the hole portions 108 and 109 shown in FIG. The positions of the folding lines 110 and 111 are the same as those of the folding lines 79 and 81 described with reference to FIG. 6, and the tip portions bent here are inserted into the mounting parts 52 and 53 of the circuit board 50.

次にカバー筐体のいくつかの変形例を説明する。図1から図3で説明したカバー筐体は、発光素子の近傍は厚さが一様の平行平板であるとして説明した。図14から図16は、カバー筐体の厚さ方向の形状を工夫して、発光素子からの光の放射性の改善を図る例を示す図である。なお、以下では、図1から図13の要素と同様の要素には同一の符号を付し、詳細な説明を省略する。また、図1から図13の符号を用いて説明する。   Next, some modifications of the cover housing will be described. The cover housing described in FIGS. 1 to 3 has been described on the assumption that the vicinity of the light emitting element is a parallel plate having a uniform thickness. FIGS. 14 to 16 are diagrams illustrating an example in which the shape of the cover casing in the thickness direction is devised to improve the radiation of light from the light emitting element. In the following, the same elements as those in FIGS. 1 to 13 are denoted by the same reference numerals, and detailed description thereof is omitted. Further, description will be made using the reference numerals in FIGS.

図14のカバー筐体130は、その中央部において底面側に凸部134を有するものである。凸部の具体的形状は、例えば、球面の一部であるものとすることができる。そして、この凸部の中に発光素子82を収納するように適当なくぼみ132を形成し、凸部134の先端が透光性基板80の上面に接するものとできる。なお、上記のように、発光素子82の下面側には遮光板62が配置されている。このようにすることで、この凸部134をあたかも凸レンズのように働かせ、発光素子82から下向きに放射して出る光を凸部134の内面に集めて、効率よく、カバー筐体130の上面側に向けて放射させることができる。   The cover housing 130 in FIG. 14 has a convex portion 134 on the bottom surface side at the center thereof. The specific shape of the convex portion can be, for example, a part of a spherical surface. An appropriate recess 132 is formed so as to accommodate the light emitting element 82 in the convex portion, and the tip of the convex portion 134 is in contact with the upper surface of the translucent substrate 80. As described above, the light shielding plate 62 is disposed on the lower surface side of the light emitting element 82. In this way, the convex part 134 works as if it is a convex lens, and the light emitted downward from the light emitting element 82 is collected on the inner surface of the convex part 134, and the upper surface side of the cover housing 130 is efficiently collected. Can be emitted toward

図15のカバー筐体140は、さらに、発光素子82を収納するくぼみの形状を工夫し、発光素子82から下向きに放射して出る光を、上面側に向くようにしたものである。図14において、発光素子82を収納するくぼみは適当な形状であったが、図15においては、半球状のくぼみ136としている。このようにすることで、このくぼみ136の内面に入射した光の進路が、より上面側に向かうようにできる。   Further, the cover housing 140 of FIG. 15 is a device in which the shape of the recess for housing the light emitting element 82 is devised so that light emitted from the light emitting element 82 downward is directed toward the upper surface side. In FIG. 14, the recess for housing the light emitting element 82 has an appropriate shape, but in FIG. 15, the recess is a hemispherical recess 136. By doing in this way, the path of the light incident on the inner surface of the recess 136 can be further directed toward the upper surface side.

図16のカバー筐体142は、その中央部における底面側の凸部の形状を球面の一部とせずに、円錐形の一部の形状を有する凸部138とする例を示す図である。このようにすることで、凸部138の内面で反射する光の指向性を高めることができる。   The cover housing 142 in FIG. 16 is a diagram illustrating an example in which the shape of the convex portion on the bottom surface side at the center portion is not a part of a spherical surface, but a convex part 138 having a conical shape. By doing in this way, the directivity of the light reflected by the inner surface of the convex part 138 can be improved.

[実施例2]
図1で説明した反射型光センサ10及びその変形例では、遮光板として光吸収材または光反射材を用いて、発光素子82からの下向きの光が受光素子60に回り込まないようにしている。ここで、リフレクタを用いて、発光素子82からの下向きの光を上向きに反射させ、対象物8に照射するものとすることもできる。
[Example 2]
In the reflection type optical sensor 10 described in FIG. 1 and its modification, a light absorbing material or a light reflecting material is used as a light shielding plate so that downward light from the light emitting element 82 does not enter the light receiving element 60. Here, it is also possible to irradiate the object 8 by reflecting downward light from the light emitting element 82 upward using a reflector.

図17から図22は、リフレクタ180を用いる反射型光センサ160の構成を説明する図である。ここで図17は反射型光センサ160の平面図、図18はその正面断面図、図19は側面断面図である。なお、図19には、反射型光センサ10の構成要素ではないが、センシングの対象である対象物8が破線で示されている。また、図17においては、一部破断図として、内部構成が図示されている。なお、以下では、図1から図16の要素と同様の要素には同一の符号を付し、詳細な説明を省略する。また、図1から図16の符号を用いて説明する。   FIGS. 17 to 22 are diagrams for explaining the configuration of the reflective photosensor 160 using the reflector 180. 17 is a plan view of the reflective optical sensor 160, FIG. 18 is a front sectional view thereof, and FIG. 19 is a side sectional view thereof. In FIG. 19, although not a component of the reflective optical sensor 10, the target object 8 that is a sensing target is indicated by a broken line. Moreover, in FIG. 17, an internal structure is illustrated as a partially broken view. In the following, the same elements as those in FIGS. 1 to 16 are denoted by the same reference numerals, and detailed description thereof is omitted. Further, description will be made using the reference numerals in FIGS.

反射型光センサ160は、図1で説明した反射型光センサ10と同じ外形を有する。カバー筐体162は、発光素子82を一部収納するくぼみを底面側に有するところが相違するほかは図1のカバー筐体20と同じである。また、ここでは裏蓋164が図1のシールド蓋24に代えて用いられている。もちろん、図1のシールド蓋24をそのまま用いることもできる。   The reflective photosensor 160 has the same outer shape as the reflective photosensor 10 described in FIG. The cover casing 162 is the same as the cover casing 20 of FIG. 1 except that the bottom of the cover casing 162 has a recess for housing a part of the light emitting element 82. Further, here, the back cover 164 is used in place of the shield cover 24 of FIG. Of course, the shield cover 24 of FIG. 1 can be used as it is.

リフレクタ180は、受光素子60と発光素子82との間に、上方に行くほど開口の大きさが広がる形状のくぼみを有する集光部材である。くぼみの深さは、少なくとも発光素子82の発光面がくぼみの内部となるように十分深く設定される。例えば、発光素子82の高さの少なくとも1/2以上の深さを有することが好ましい。リフレクタ180は、少なくともくぼみの内面が高い反射率の表面に仕上げられていることが好ましい。このくぼみの中に発光素子82が配置されることで、発光素子82から下向きに出る光は、リフレクタ180の内面において反射して、場合によってはそのまま上方に向けて放射され、あるいは、再びリフレクタ180の内面の別の箇所において反射し、そこで上方に向けて放射され、あるいは場合によってはこれを数回繰り返して上方に向けて放射される。したがって、発光素子82から下向きに出た光は、最終的にはことごとく上方に向けて放射される。この意味で、図1の反射型光センサ10に比べ、対象物8に対する光の強度を格段に高めることができる。   The reflector 180 is a light condensing member having a recess between the light receiving element 60 and the light emitting element 82 so that the size of the opening increases as it goes upward. The depth of the recess is set sufficiently deep so that at least the light emitting surface of the light emitting element 82 is inside the recess. For example, the depth of the light emitting element 82 is preferably at least ½ or more of the height. The reflector 180 is preferably finished with a highly reflective surface on at least the inner surface of the recess. By disposing the light emitting element 82 in the recess, the light emitted downward from the light emitting element 82 is reflected on the inner surface of the reflector 180 and may be emitted upward as the case may be, or may be reflected again. It is reflected at another point on the inner surface of the light, where it is emitted upward, or in some cases this is repeated several times and emitted upward. Therefore, light emitted downward from the light emitting element 82 is finally emitted upward. In this sense, the intensity of light with respect to the object 8 can be significantly increased as compared with the reflective optical sensor 10 of FIG.

かかるリフレクタ180は、適当な金属材料を絞り加工によって成形したものを用いることができる。例えば、アルミニウム板材を用い、四角錘形状において頭部を平坦に切断した外形に成形したものをリフレクタ180とすることができる。必要に応じ、リフレクタ180のくぼみの内面を光沢仕上げをするものとしてもよい。   As the reflector 180, an appropriate metal material formed by drawing can be used. For example, a reflector 180 can be formed by using an aluminum plate material and having a quadrangular pyramid shape that is formed into an outer shape in which the head is cut flat. If necessary, the inner surface of the indentation of the reflector 180 may be polished.

透光性基板170は、発光素子82を搭載する基板であるが、発光素子82がリフレクタ180のくぼみの内部に配置されることから、図18に示されるように、リフレクタ180の底面に配置された後、リフレクタ180のくぼみの斜面に沿って上方に延び、カバー筐体162の上面板部の底面側に密着するようにして配置される。そして、両端部は、図1の反射型光センサ10と同様に、取付部52において、挿入され、半田付け等で接続固定が行われる。   The translucent substrate 170 is a substrate on which the light emitting element 82 is mounted. Since the light emitting element 82 is disposed inside the recess of the reflector 180, the light transmitting element is disposed on the bottom surface of the reflector 180 as shown in FIG. After that, it extends upward along the slope of the recess of the reflector 180 and is arranged so as to be in close contact with the bottom surface side of the upper surface plate portion of the cover housing 162. Then, both ends are inserted in the mounting portion 52 in the same manner as in the reflective optical sensor 10 of FIG. 1, and are connected and fixed by soldering or the like.

図20は、透光性基板170の展開詳細図である。また、図21は、発光素子82、透光性基板170、リフレクタ180の関係を示す模式的斜視図、図22は、リフレクタ180近傍の拡大図である。   FIG. 20 is a development detail view of the translucent substrate 170. 21 is a schematic perspective view showing the relationship between the light emitting element 82, the translucent substrate 170, and the reflector 180. FIG. 22 is an enlarged view of the vicinity of the reflector 180.

図21、図22に示されるように、透光性基板170および発光素子82は、受光素子60上のリフレクタ180と、くぼみを有するカバー筐体162によって挟まれてしっかりと保持される。したがって、透光性基板170は、図1の反射型光センサ10に用いられる透光性基板80に比べ、取り付けと保持等のための強度をあまり心配しなくてもよく、図20に示されるように、細い形状とし、発光素子82の2端子に対応する発光素子用配線172,173を両側に引きだすものとすることができる。透光性基板170の両端に引き出された発光素子用配線172,173は、それぞれ接続用パターン174,175となる。これらの接続用パターン174,175は、図6で説明した接続用パターン94,95と同様に、回路基板50との接続固定に用いられる。   As shown in FIG. 21 and FIG. 22, the translucent substrate 170 and the light emitting element 82 are sandwiched and firmly held by the reflector 180 on the light receiving element 60 and the cover housing 162 having a recess. Therefore, the translucent substrate 170 does not need to worry much about the strength for mounting and holding compared to the translucent substrate 80 used in the reflective optical sensor 10 of FIG. 1, and is shown in FIG. As described above, the light emitting element wirings 172 and 173 corresponding to the two terminals of the light emitting element 82 can be drawn out on both sides. The light emitting element wirings 172 and 173 led to both ends of the translucent substrate 170 become connection patterns 174 and 175, respectively. These connection patterns 174 and 175 are used for connection and fixation with the circuit board 50 in the same manner as the connection patterns 94 and 95 described with reference to FIG.

[実施例3]
上記では、カバー筐体の平面外形を略矩形として説明した。図23は、カバー筐体の平面外形を円形とする反射型光センサ200の構成を示す図である。なお、以下では、図1から図16の要素と同様の要素には同一の符号を付し、詳細な説明を省略する。また、図1から図16の符号を用いて説明する。
[Example 3]
In the above description, the planar outer shape of the cover housing is described as being substantially rectangular. FIG. 23 is a diagram illustrating a configuration of the reflective photosensor 200 in which the planar outer shape of the cover housing is circular. In the following, the same elements as those in FIGS. 1 to 16 are denoted by the same reference numerals, and detailed description thereof is omitted. Further, description will be made using the reference numerals in FIGS.

反射型光センサ200は、上記のように、平面外形が円形のカバー筐体202を有するこれに対応して、遮光膜204も外形が円形の中に矩形の窓部を有する形状となる。また、回路基板210も、カバー筐体202の内部に収納配置される部分の形状が円形となる。それ以外の各要素の内容は、図1の反射型光センサ10について説明したものと同様である。   As described above, the reflection type photosensor 200 has the cover housing 202 having a circular planar outer shape, and the light shielding film 204 has a shape having a rectangular window in the circular outer shape. In addition, the circuit board 210 also has a circular shape in the portion that is housed and arranged inside the cover housing 202. The contents of the other elements are the same as those described for the reflective optical sensor 10 of FIG.

回路基板210について、カバー筐体202の内部に収納配置される部分の形状が円形となるため、透光性基板の形状の選択に自由度が増加する。図24、図25は、円形のカバー筐体202を有する反射型光センサ200に適した透光性基板の例を示す図である。   Since the shape of the portion of the circuit board 210 that is housed and arranged inside the cover housing 202 is circular, the degree of freedom in selecting the shape of the translucent board increases. 24 and 25 are diagrams showing examples of a light-transmitting substrate suitable for the reflective optical sensor 200 having a circular cover housing 202. FIG.

図24の透光性基板220は、発光素子用配線90,91の保持に必要な部分を残し、できるだけ透光性フィルムを削除し、受光素子60の受光領域61を露出するようにした例である。   The translucent substrate 220 in FIG. 24 is an example in which a portion necessary for holding the light emitting element wirings 90 and 91 is left, the translucent film is deleted as much as possible, and the light receiving region 61 of the light receiving element 60 is exposed. is there.

図25の透光性基板230は、発光素子82から4方向に延びるアーム状の部分を有し、それ以外の透光性フィルムの部分を削除した形状を有する。この形状は、図11から図13で説明したものと類似するが、回路基板50が円形部分を有する場合は、アームの延びる方向を比較的自由に選択できる。図25の場合では、アームの延びる方向が受光素子60の辺に平行な方向とされている。   The translucent substrate 230 in FIG. 25 has an arm-shaped portion extending in four directions from the light emitting element 82, and has a shape in which the other translucent film portions are deleted. Although this shape is similar to that described with reference to FIGS. 11 to 13, when the circuit board 50 has a circular portion, the extending direction of the arm can be selected relatively freely. In the case of FIG. 25, the extending direction of the arm is a direction parallel to the side of the light receiving element 60.

なお、カバー筐体の平面外形を円形とする反射型光センサ200においても、図11から図13と同様の形状の透光性基板を用いるものとしてもよい。また、図1で説明した反射型光センサ10、図17で説明した反射型光センサ160に、図24、図25と同様の形状の透光性基板を用いるものとしてもよい。   Also in the reflection type optical sensor 200 in which the planar outer shape of the cover housing is circular, a light-transmitting substrate having the same shape as that shown in FIGS. 11 to 13 may be used. Further, a light-transmitting substrate having the same shape as that in FIGS. 24 and 25 may be used for the reflective photosensor 10 described with reference to FIG. 1 and the reflective photosensor 160 described with reference to FIG.

本発明に係る反射型光センサは、対象物に発光素子から光を当て、対象物からの反射光を受光素子で受けて、対象物の位置、変位、物性等を検出するために用いられる。   The reflection type optical sensor according to the present invention is used to detect the position, displacement, physical properties, etc. of an object by applying light from the light emitting element to the object and receiving the reflected light from the object by the light receiving element.

【0002】
構造となり、発光素子からの出る光の大部分が受光領域で受光され光の利用効率が大幅に向上すると述べられている。
特許文献1:特開2005−123311号公報
特許文献2:特開2001−326382号公報
発明の開示
発明が解決しようとする課題
[0006]
上記特許文献によれば、発光素子から放射する光の軸の中心と受光素子が受け取る光の軸の中心とがほぼ一致するので、発光素子から放射されて対象物から反射されてくる光を効率よく受光素子に集めることができる。しかし、特許文献1においては、導光体を要する。また、特許文献2においては、受光素子の上に発光素子を樹脂封止し、その側壁等を遮光する処理を行い、さらに全体を樹脂封止することを要する。
[0007]
本願の目的は、比較的簡単な構成で、発光素子から放射されて対象物から反射されてくる光を効率よく受光素子に集めることができる反射型光センサを提供することである。
課題を解決するための手段
[0008]
本発明に係る反射型光センサは、対象物に向けて上面に受光領域を有する受光素子と、受光素子が搭載される主回路基板と、平面寸法が受光素子よりも小さい発光素子と、発光素子が受光素子の受光領域の中央部に来るように発光素子を配置する回路基板であって、受光素子の上面側に配置され、主回路基板と接続される透光性基板と、発光素子から下向きに放射される光が受光素子に入り込まないように発光素子の真下に配置される遮光部材または反射部材と、を含み、発光素子から対象物に光を当て、対象物から反射してくる光を受光素子で受けることを特徴とする。
[0009]
また、本発明に係る反射型光センサにおいて、発光素子は、バンプ形状の端子を有し、発光面を透光性基板側に向けてバンプ端子によって透光性基板に実装されることが好ましい。
[0010]
[0011]
また、本発明に係る反射型光センサにおいて、透光性基板に設けられる複数の配線であって、一端側が透光性基板の中央部に配置されて発光素子の各端子とそれぞれ接続され、他端側が透光性基板の周辺部にそれぞれ配置される発光素子用配線を有することが好ましい。
[0002]
It is said that most of the light emitted from the light emitting element is received in the light receiving region and the light use efficiency is greatly improved.
Patent Document 1: Japanese Patent Laid-Open No. 2005-123411 Patent Document 2: Japanese Patent Laid-Open No. 2001-326382 Disclosure of the Invention Problems to be Solved [0006]
According to the above-mentioned patent document, since the center of the axis of light emitted from the light emitting element and the center of the axis of light received by the light receiving element substantially coincide with each other, the light emitted from the light emitting element and reflected from the object is efficiently used. It can often be collected in the light receiving element. However, in patent document 1, a light guide is required. Further, in Patent Document 2, it is necessary to perform a process of sealing the light emitting element on the light receiving element, shielding the side wall and the like, and further sealing the whole.
[0007]
An object of the present application is to provide a reflective optical sensor that can efficiently collect light emitted from a light emitting element and reflected from an object with a relatively simple configuration.
Means for Solving the Problems [0008]
A reflective optical sensor according to the present invention includes a light receiving element having a light receiving region on an upper surface thereof toward an object, a main circuit board on which the light receiving element is mounted, a light emitting element having a smaller plane dimension than the light receiving element, and a light emitting element Is a circuit board on which the light emitting element is arranged so as to be in the center of the light receiving area of the light receiving element, and is disposed on the upper surface side of the light receiving element and is connected to the main circuit board, and downward from the light emitting element A light-shielding member or a reflective member disposed directly below the light-emitting element so that light emitted from the light-emitting element does not enter the light-receiving element, and applies light from the light-emitting element to the object and reflects light reflected from the object It is received by a light receiving element.
[0009]
In the reflective optical sensor according to the present invention, it is preferable that the light emitting element has a bump-shaped terminal and is mounted on the translucent substrate by the bump terminal with the light emitting surface facing the translucent substrate.
[0010]
[0011]
Further, in the reflection type photosensor according to the present invention, a plurality of wirings provided on the translucent substrate, one end side of which is disposed at the central portion of the translucent substrate and connected to each terminal of the light emitting element, respectively. It is preferable that the end side has a wiring for a light emitting element, which is arranged in the peripheral portion of the light transmitting substrate.

【0003】
[0012]
また、本発明に係る反射型光センサにおいて、複数の配線は、透光性基板を挟んで相互に重なって配置される部分を有することが好ましい。
[0013]
また、本発明に係る反射型光センサにおいて、受光素子を搭載する基板であって、透光性基板の周辺部を取り付ける取付部を有する受光素子基板を含み、透光性基板は、その周辺部において位置決めされて受光素子基板に取り付けられることが好ましい。
[0014]
また、本発明に係る反射型光センサにおいて、受光素子基板には、発光素子用の複数の引出配線が取付部を通って設けられ、透光性基板の周辺部が取付部に電気的に接続されて取り付けられることで、発光素子の各端子が複数の引出線と接続されることが好ましい。
[0015]
また、本発明に係る反射型光センサにおいて、受光素子基板は、受光素子が搭載される反対側の裏面側に、発光素子または受光素子の少なくとも一方のための電子回路が実装されることが好ましい。
[0016]
また、本発明に係る反射型光センサにおいて、受光素子と発光素子とを覆う光学的カバー素子であって、発光素子からの光を外部に導き、外部からの反射光を受光素子に導く光学的カバー素子を含むことが好ましい。
[0017]
また、本発明に係る反射型光センサにおいて、光学的カバー素子は、窓部を除いて光の出入りを制限する遮光部を有することが好ましい。
発明の効果
[0018]
上記構成により、反射型光センサは、上面に受光領域を有する受光素子の上面側に透光性基板が配置され、その透光性基板の上面に、平面寸法が受光素子よりも小さい発光素子が配置される。近年の半導体素子の小型化技術の進展によって、例えば小型の発光素子を用いることが容易となってきている。一例を上げると、1つの発光素子の平面寸法が0.2mm角のものを用いることができる。このように小型の発光素子を透光性基板の上に配置し、発光素子よりも大きい平面寸法の受光素子の上にこの透光性基板を配置すれば、比較的簡単な構成で、発光素子から放射されて対象物から反射されてくる光を効率よく受光素子に集めることができる。
[0019]
また、発光素子はバンプ形状の端子を有し、バンプ端子によって透光性基板に実
[0003]
[0012]
In the reflection type optical sensor according to the present invention, it is preferable that the plurality of wirings have portions arranged to overlap each other with the translucent substrate interposed therebetween.
[0013]
Further, in the reflection type optical sensor according to the present invention, the substrate includes a light receiving element substrate on which the light receiving element is mounted, the light receiving element substrate having a mounting portion to which the peripheral portion of the light transmitting substrate is attached. It is preferable to be positioned and attached to the light receiving element substrate.
[0014]
In the reflection type photosensor according to the present invention, the light receiving element substrate is provided with a plurality of lead wires for the light emitting element through the attachment portion, and the peripheral portion of the translucent substrate is electrically connected to the attachment portion. By being attached, it is preferable that each terminal of the light emitting element is connected to a plurality of lead wires.
[0015]
In the reflection type photosensor according to the present invention, the light receiving element substrate is preferably mounted with an electronic circuit for at least one of the light emitting element and the light receiving element on the back side opposite to the side on which the light receiving element is mounted. .
[0016]
The reflective optical sensor according to the present invention is an optical cover element that covers the light receiving element and the light emitting element, and is an optical cover that guides light from the light emitting element to the outside and guides reflected light from the outside to the light receiving element. It is preferable to include a cover element.
[0017]
In the reflective optical sensor according to the present invention, it is preferable that the optical cover element has a light shielding portion that restricts light entry and exit except for the window portion.
Effects of the Invention [0018]
With the above configuration, the reflective optical sensor has a light-transmitting substrate disposed on the upper surface side of the light-receiving element having a light-receiving region on the upper surface, and a light-emitting element having a planar dimension smaller than that of the light-receiving element is formed on the upper surface of the light-transmitting substrate. Be placed. With recent progress in miniaturization technology of semiconductor elements, it has become easy to use, for example, small light emitting elements. As an example, a light emitting device having a planar dimension of 0.2 mm square can be used. Thus, if a small light-emitting element is arranged on a light-transmitting substrate and this light-transmitting substrate is arranged on a light-receiving element having a larger plane size than the light-emitting element, the light-emitting element has a relatively simple configuration. The light radiated from the light and reflected from the object can be efficiently collected on the light receiving element.
[0019]
In addition, the light emitting element has bump-shaped terminals, and the bump terminals are mounted on the translucent substrate.

【0014】
のチップ表面に配線される端子パターンの上に適当な高さの導電性材料を配置したもので、チップ表面より盛り上がった形状を有する。バンプ端子84,85の平面図における直径は、例えば0.1mm程度以下とすることができる。したがって、発光素子82の大きさは、0.2mm角程度のものでもバンプ端子84,85を形成することができる。
[0059]
この2つのバンプ端子84,85を、発光素子用配線90,91のそれぞれの上に来るように位置決めし、適当な圧力の下で熱エネルギあるいは超音波エネルギーを与えることで、バンプ端子84,85を発光素子用配線90,91に電気的に接続し、固定することができる。必要があれば、熱エネルギと共に超音波エネルギも与えるものとしてもよい。このように、バンプ端子を用いてチップの端子を外部配線に接続する技術は、バンプ接続技術、フリップチップ接続技術、あるいはフェースダウン接続技術等と呼ばれる。
[0060]
フェースダウン接続技術と呼ばれることから分かるように、発光素子82は、端子パターンが配線されるチップ表面を下側に向けて、バンプ端子84,85が発光素子用配線90,91と接続される。発光素子82の発光面は一般的にチップの内部であるが、端子パターンが配線されるチップ表面から放射される光は下向きとなる。すなわち、透光性基板80の上面に向かって、換言すれば、受光素子60の上面である受光面に向かって、発光素子82から光が放射されることになる。もちろん、発光素子82の側面からも底面からも光が放射されるが、端子パターンが配線されるチップ表面からの光は、受光素子60に向かって放射されることになる。
[0061]
図6に戻って、破線で示される遮光板62は、発光素子82から下向きに放射される光が受光素子60に入り込まないようにする機能を有する部材である。その部分の拡大図を図8に示す。図8に示されるように、遮光板62は、透光性基板80と受光素子60との間であって、発光素子82の真下に配置され、その大きさは、発光素子82から放射する光が受光素子60に回り込まない程度であることを要する。かかる遮光板62としては、黒色を有する適当な光吸収板を用いることができる。
[0062]
遮光板62の機能は、発光素子82からの下向きの光を受光素子60に入り込まないようにするものであるので、光吸収材の代わりに、光反射材を用いてもよい。図9は、光反射材118を透光性基板80と受光素子60との間に配置する例を示す図である。
[0014]
A conductive material having an appropriate height is arranged on a terminal pattern wired on the chip surface, and has a shape raised from the chip surface. The diameter of the bump terminals 84 and 85 in the plan view can be set to about 0.1 mm or less, for example. Accordingly, the bump terminals 84 and 85 can be formed even when the light emitting element 82 has a size of about 0.2 mm square.
[0059]
The bump terminals 84 and 85 are positioned by positioning the two bump terminals 84 and 85 on the light emitting element wirings 90 and 91, and applying thermal energy or ultrasonic energy under an appropriate pressure. Can be electrically connected to and fixed to the light emitting element wirings 90 and 91. If necessary, ultrasonic energy may be given together with thermal energy. As described above, a technique for connecting a chip terminal to an external wiring using a bump terminal is called a bump connection technique, a flip chip connection technique, a face-down connection technique, or the like.
[0060]
As can be seen from the face-down connection technique, the light emitting element 82 has the bump terminals 84 and 85 connected to the light emitting element wirings 90 and 91 with the chip surface on which the terminal pattern is wired facing downward. The light emitting surface of the light emitting element 82 is generally inside the chip, but the light emitted from the chip surface on which the terminal pattern is wired faces downward. That is, light is emitted from the light emitting element 82 toward the upper surface of the translucent substrate 80, in other words, toward the light receiving surface that is the upper surface of the light receiving element 60. Of course, light is emitted from both the side surface and the bottom surface of the light emitting element 82, but light from the chip surface on which the terminal pattern is wired is emitted toward the light receiving element 60.
[0061]
Returning to FIG. 6, the light shielding plate 62 indicated by a broken line is a member having a function of preventing light emitted downward from the light emitting element 82 from entering the light receiving element 60. An enlarged view of that portion is shown in FIG. As shown in FIG. 8, the light shielding plate 62 is disposed between the translucent substrate 80 and the light receiving element 60 and immediately below the light emitting element 82, and the size thereof is the light emitted from the light emitting element 82. It is necessary that the thickness does not wrap around the light receiving element 60. As the light shielding plate 62, a suitable light absorbing plate having a black color can be used.
[0062]
Since the function of the light shielding plate 62 is to prevent the downward light from the light emitting element 82 from entering the light receiving element 60, a light reflecting material may be used instead of the light absorbing material. FIG. 9 is a diagram illustrating an example in which the light reflecting material 118 is disposed between the translucent substrate 80 and the light receiving element 60.

【0015】
この場合でも光反射材118は、発光素子82の真下に配置され、その大きさは、発光素子82から放射する光が受光素子60に回り込まない程度であることを要する。かかる光反射材118としては、アルミニウム等の適当な金属板を用いることができる。光反射材118は、少なくとも発光素子82側が光反射性を有することを要するが、受光素子60側は必ずしも光反射性を有していなくてもよい。例えば、受光素子60側の面に黒色塗料等の適当な光吸収性膜を配置するものとしてもよい。
[0063]
図10は、発光素子82から放射する光が受光素子60に回り込むことをさらに抑制するために、凹面を有する透光性基板120を用い、凹面のくぼみの中に発光素子82を配置し、受光素子60側の面に遮光膜124を設ける例を示す図である。遮光膜124は、光吸収材であってもよく、光反射材であってもよい。光反射材の場合は、少なくとも発光素子82側が光反射性を有していればよい。また、図10に示されるように、透光性基板120の発光素子82側の面において、発光素子用配線を広げて、凹面に沿った形状の発光素子用配線121,122とすることもできる。
[0064]
図6では、受光素子60の受光領域61に影響を与えることを少なくするため、発光素子用配線90,91は両面配線としたのであるが、発光素子82の近傍では、発光素子82から受光素子60へ向かう光が問題となるので、この近傍部分においては却って発光素子用配線を広げて、発光素子82からの光を遮光するものとすることができる。したがって、凹面に沿った形状の発光素子用配線121,122の隙間等によって遮光できない部分のみに、遮光膜124を設けるものとすることができる。
[0065]
なお、受光素子60の上面と透光性基板80の下面とは必ずしも固定する必要はないが、必要に応じ、適当な接着材等を用いて固定するものとしてもよい。例えば、透光性基板80と遮光板62等とを適当な接着材で固定するものとすれば、そのときに、同時に受光素子60の上面に遮光板62等を接着固定するものとしてもよい。
[0066]
このように、平面寸法が受光素子よりも小さい発光素子を用いてこれを透光性基板の上に配置し、透光性基板を受光素子の上に配置することで、発光素子から放射されて対象物から反射されてくる光を効率よく受光素子に集めることができる。また、バンプ端子を用いて、発光素子を透光性基板上の発光素子用配線に接続することで、ワイヤボンディングを用いる従来技術に比べ、受光素子上にワイヤによる影が発生し
[0015]
Even in this case, the light reflecting material 118 is disposed directly under the light emitting element 82, and the size of the light reflecting material 118 needs to be such that the light emitted from the light emitting element 82 does not enter the light receiving element 60. As the light reflecting material 118, an appropriate metal plate such as aluminum can be used. The light reflecting material 118 requires that at least the light emitting element 82 side has light reflectivity, but the light receiving element 60 side does not necessarily have light reflectivity. For example, an appropriate light-absorbing film such as a black paint may be disposed on the surface on the light receiving element 60 side.
[0063]
In FIG. 10, in order to further suppress the light radiated from the light emitting element 82 from entering the light receiving element 60, a light-transmitting substrate 120 having a concave surface is used, and the light emitting element 82 is disposed in the concave of the concave surface. It is a figure which shows the example which provides the light shielding film 124 in the surface at the side of the element 60. FIG. The light shielding film 124 may be a light absorbing material or a light reflecting material. In the case of a light reflecting material, it is sufficient that at least the light emitting element 82 side has light reflectivity. Further, as shown in FIG. 10, the light emitting element wiring can be widened on the light emitting element 82 side surface of the translucent substrate 120 to form light emitting element wirings 121 and 122 having a shape along the concave surface. .
[0064]
In FIG. 6, in order to reduce the influence on the light receiving region 61 of the light receiving element 60, the light emitting element wirings 90 and 91 are double-sided wiring. However, in the vicinity of the light emitting element 82, the light emitting element 82 to the light receiving element. Since light directed to 60 becomes a problem, the light emitting element wiring can be widened in the vicinity of the light to block light from the light emitting element 82. Therefore, the light shielding film 124 can be provided only in a portion where light cannot be shielded by a gap between the light emitting element wirings 121 and 122 having a shape along the concave surface.
[0065]
The upper surface of the light receiving element 60 and the lower surface of the translucent substrate 80 are not necessarily fixed, but may be fixed using an appropriate adhesive or the like as necessary. For example, if the translucent substrate 80 and the light shielding plate 62 are fixed with an appropriate adhesive, the light shielding plate 62 and the like may be simultaneously bonded to the upper surface of the light receiving element 60 at that time.
[0066]
As described above, the light emitting element having a smaller plane dimension than the light receiving element is used and disposed on the light transmitting substrate, and the light transmitting element is disposed on the light receiving element so that the light emitting element emits light. Light reflected from the object can be efficiently collected on the light receiving element. In addition, by connecting the light emitting element to the wiring for the light emitting element on the translucent substrate using the bump terminal, a shadow caused by the wire is generated on the light receiving element as compared with the conventional technique using wire bonding.

Claims (10)

上面に受光領域を有する受光素子と、
受光素子の上面側に配置される透光性基板と、
透光性基板の上面に配置され、平面寸法が受光素子よりも小さい発光素子と、
を含むことを特徴とする反射型光センサ。
A light receiving element having a light receiving region on the upper surface;
A translucent substrate disposed on the upper surface side of the light receiving element;
A light-emitting element disposed on the upper surface of the light-transmitting substrate and having a planar dimension smaller than that of the light-receiving element;
A reflection type optical sensor comprising:
請求項1に記載の反射型光センサにおいて、
発光素子は、バンプ形状の端子を有し、発光面を透光性基板側に向けてバンプ端子によって透光性基板に実装されることを特徴とする反射型光センサ。
The reflective optical sensor according to claim 1,
The light-emitting element has a bump-shaped terminal and is mounted on the light-transmitting substrate by the bump terminal with the light-emitting surface facing the light-transmitting substrate.
請求項2に記載の反射型光センサにおいて、
発光素子と受光素子との間に遮光部材または反射部材が設けられることを特徴とする反射型光センサ。
The reflective optical sensor according to claim 2, wherein
A reflection type optical sensor, wherein a light shielding member or a reflection member is provided between a light emitting element and a light receiving element.
請求項1に記載の反射型光センサにおいて、
透光性基板に設けられる複数の配線であって、一端側が透光性基板の中央部に配置されて発光素子の各端子とそれぞれ接続され、他端側が透光性基板の周辺部にそれぞれ配置される発光素子用配線を有することを特徴とする反射型光センサ。
The reflective optical sensor according to claim 1,
A plurality of wirings provided on the translucent substrate, one end side being arranged at the central portion of the translucent substrate and connected to each terminal of the light emitting element, and the other end side being arranged at the peripheral portion of the translucent substrate, respectively. A reflection type optical sensor comprising a wiring for a light emitting element.
請求項4に記載の反射型光センサにおいて、
複数の配線は、透光性基板を挟んで相互に重なって配置される部分を有することを特徴とする反射型光センサ。
The reflective optical sensor according to claim 4, wherein
The reflective optical sensor characterized in that the plurality of wirings have portions arranged to overlap each other with the light-transmitting substrate interposed therebetween.
請求項4に記載の反射型光センサにおいて、
受光素子を搭載する基板であって、透光性基板の周辺部を取り付ける取付部を有する受光素子基板を含み、透光性基板は、その周辺部において位置決めされて受光素子基板に取り付けられることを特徴とする反射型光センサ。
The reflective optical sensor according to claim 4, wherein
A substrate on which a light receiving element is mounted, including a light receiving element substrate having a mounting portion for attaching a peripheral portion of the light transmitting substrate, and the light transmitting substrate is positioned at the peripheral portion and attached to the light receiving element substrate. A reflective optical sensor.
請求項6に記載の反射型光センサにおいて、
受光素子基板には、発光素子用の複数の引出配線が取付部を通って設けられ、透光性基板の周辺部が取付部に電気的に接続されて取り付けられることで、発光素子の各端子が複数の引出線と接続されることを特徴とする反射型光センサ。
The reflective optical sensor according to claim 6,
The light receiving element substrate is provided with a plurality of lead wirings for the light emitting element through the attachment portion, and the peripheral portion of the translucent substrate is attached by being electrically connected to the attachment portion. Is connected to a plurality of leader lines.
請求項6に記載の反射型光センサにおいて、
受光素子基板は、受光素子が搭載される反対側の裏面側に、発光素子または受光素子の少なくとも一方のための電子回路が実装されることを特徴とする反射型光センサ。
The reflective optical sensor according to claim 6,
A reflection type optical sensor, wherein the light receiving element substrate has an electronic circuit for at least one of the light emitting element and the light receiving element mounted on the back side opposite to the side on which the light receiving element is mounted.
請求項1に記載の反射型光センサにおいて、
受光素子と発光素子とを覆う光学的カバー素子であって、発光素子からの光を外部に導き、外部からの反射光を受光素子に導く光学的カバー素子を含むことを特徴とする反射型光センサ。
The reflective optical sensor according to claim 1,
An optical cover element that covers a light receiving element and a light emitting element, and includes an optical cover element that guides light from the light emitting element to the outside and guides reflected light from the outside to the light receiving element. Sensor.
請求項9に記載の反射型光センサにおいて、
光学的カバー素子は、窓部を除いて光の出入りを制限する遮光部を有することを特徴とする反射型光センサ。
The reflective optical sensor according to claim 9, wherein
The reflection type optical sensor, wherein the optical cover element has a light-shielding portion that restricts light in and out except for the window portion.
JP2009506345A 2007-03-26 2008-03-25 Reflective light sensor Pending JPWO2008117800A1 (en)

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