JPH0722936A - Led device for photoelectric switch - Google Patents
Led device for photoelectric switchInfo
- Publication number
- JPH0722936A JPH0722936A JP14580193A JP14580193A JPH0722936A JP H0722936 A JPH0722936 A JP H0722936A JP 14580193 A JP14580193 A JP 14580193A JP 14580193 A JP14580193 A JP 14580193A JP H0722936 A JPH0722936 A JP H0722936A
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- Prior art keywords
- circuit
- photoelectric switch
- led
- oscillation
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Geophysics And Detection Of Objects (AREA)
- Led Devices (AREA)
- Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
- Electronic Switches (AREA)
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明はＬＥＤ素子と発振回路
を一体に組込んだ光電スイッチ用ＬＥＤ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED device for a photoelectric switch in which an LED element and an oscillation circuit are integrally incorporated.
【０００２】[0002]
【従来の技術】この種光電スイッチは赤外線発光ダイオ
ードなどの投光素子から被検出位置に投光素子のビーム
光を投射させ、その位置における透過光や反射光をフォ
トトランジスタなどの受光素子に受けて、被検出位置に
おける物体の有無を検出し、電気信号で出力するもので
あり、移動物体の検出センサ、位置検出装置、各種の自
動制御装置、その他安全装置や警報装置など広い分野で
利用されている。2. Description of the Related Art A photoelectric switch of this type projects a beam of light from a light projecting element such as an infrared light emitting diode to a detected position and receives transmitted light or reflected light at that position to a light receiving element such as a phototransistor. It detects the presence or absence of an object at the detected position and outputs it as an electrical signal.It is used in a wide range of fields such as moving object detection sensors, position detection devices, various automatic control devices, and other safety devices and alarm devices. ing.
【０００３】上記光電スイッチは被検出位置における物
体の検出に際して、物体からの反射光を検出する反射型
タイプと、投射ビーム光の透過光を検出する透過型タイ
プの二種類がある。There are two types of photoelectric switches, a reflective type that detects the reflected light from the object and a transmissive type that detects the transmitted light of the projection beam light when detecting the object at the detected position.
【０００４】前者の反射型タイプの光電スイッチ１は、
例えば図４に示すように、投光素子２と受光素子３を、
共に共通の光電スイッチ本体４内に配設し、投光素子２
より検出位置に配置された物体５にビーム光Ｌ１を投射
して、その反射光Ｌ２を受光素子３で受光させるもので
ある。また、後者の透過型タイプの光電スイッチ６は、
例えば図５に示すように、投光素子２と受光素子３を、
それぞれ別体の投光器７と受光器８に配設し、これらの
投光器７と受光器８とを所定空間を隔てて対向配置さ
せ、投、受光器７、８間に物体５を移動させて、投光素
子２より投射したビーム光Ｌ１の透過光を受光素子３で
受光させるものである。The former reflection type photoelectric switch 1 is
For example, as shown in FIG. 4, the light projecting element 2 and the light receiving element 3 are
Both are arranged in a common photoelectric switch body 4, and the light projecting element 2
The light beam L1 is projected onto the object 5 arranged at the detection position, and the reflected light L2 is received by the light receiving element 3. In addition, the latter transmission type photoelectric switch 6 is
For example, as shown in FIG. 5, the light projecting element 2 and the light receiving element 3 are
The projector 7 and the light receiver 8 are separately provided, and the light projector 7 and the light receiver 8 are opposed to each other with a predetermined space therebetween, and the object 5 is moved between the light emitter and the light receiver 7, 8. The transmitted light of the light beam L1 projected from the light projecting element 2 is received by the light receiving element 3.
【０００５】これらの光電スイッチ１および６は、反射
型タイプの光電スイッチ１は物体５よりの反射光Ｌ２を
受光素子３で受光させる関係で、検出空間が小さく、小
さい物体の検出に好適すること、また、逆に透過型タイ
プの光電スイッチ６は別体の投光器７と受光器８を所定
空間を隔てて対向配置させ、投射したビーム光Ｌ１の透
過光を受光素子３で受光させる関係で、検出空間の広
い、大きい物体の検出に好適すること以外は、両者の構
成は基本的に同様であり、その投光回路および受光回路
は、おおむね次のような回路で構成されている。These photoelectric switches 1 and 6 have a small detection space and are suitable for the detection of a small object because the reflection type photoelectric switch 1 receives the reflected light L2 from the object 5 by the light receiving element 3. On the contrary, in the transmission type photoelectric switch 6, the projector 7 and the light receiver 8 which are separate bodies are arranged so as to face each other with a predetermined space therebetween, and the transmitted light of the projected light beam L1 is received by the light receiving element 3. The two are basically the same in structure except that they are suitable for detecting a large object having a wide detection space, and the light projecting circuit and the light receiving circuit thereof are generally composed of the following circuits.
【０００６】すなわち、光電スイッチの投光回路９は、
例えば図６に示すように、電源回路に接続された投光素
子２、この投光素子２に直列接続された電流制限抵抗１
０およびスイッチング素子１１、スイッチング素子１１
を所定周期でスイッチングして投光素子２を所定周期の
パルスで点灯する発振回路１２を有している。また、投
光素子２の電源側には、前記スイッチング素子１１の導
通毎に放電して、投光素子２に高いパルス電流を付与す
るための充放電回路１３や、動作中を示す動作表示灯１
４および投光素子２や発振回路１２に所定の定電圧を付
与する定電圧回路１５などが配設されている。That is, the light projecting circuit 9 of the photoelectric switch is
For example, as shown in FIG. 6, a light projecting element 2 connected to a power supply circuit, and a current limiting resistor 1 connected in series to this light projecting element 2.
0 and switching element 11, switching element 11
Has an oscillating circuit 12 for switching on the light emitting element 2 with a pulse of a predetermined cycle by switching the light emitting element 2 with a predetermined cycle. Further, on the power source side of the light projecting element 2, a charging / discharging circuit 13 for discharging each time the switching element 11 is conducted to give a high pulse current to the light projecting element 2, and an operation indicator lamp indicating that the light emitting element 2 is in operation. 1
4, a constant voltage circuit 15 for applying a predetermined constant voltage to the light projecting element 2 and the oscillation circuit 12, and the like are provided.
【０００７】また、受光回路１６は、例えば図７に示す
ように、受光素子３により得られた電気信号を増幅する
ための増幅器１７、増幅された信号を検波する検波回路
１８、所定レベル以上の検波信号を光電スイッチの安定
動作域のものとして表示する安定表示灯１９、出力のＯ
Ｎ、ＯＦＦ動作を指定するモード設定回路２０、および
動作中を示す動作表示灯２１などが配設されている。そ
して、これらの投光回路９、受光回路１６の各構成要素
は、一枚の回路基板２２ａ，２２ｂ，２２ｃに組込ま
れ、それぞれ反射型光電スイッチ１の光電スイッチ本体
４や透過型光電スイッチ６の投光器７、受光器８の筐体
内に収納される。Further, the light receiving circuit 16 is, for example, as shown in FIG. 7, an amplifier 17 for amplifying an electric signal obtained by the light receiving element 3, a detection circuit 18 for detecting the amplified signal, and a predetermined level or more. Stability indicator lamp 19 for displaying the detection signal as a stable operation range of the photoelectric switch, output O
A mode setting circuit 20 for designating N and OFF operations, an operation indicator 21 for indicating operation, and the like are provided. Then, the respective constituent elements of the light projecting circuit 9 and the light receiving circuit 16 are incorporated into one circuit board 22a, 22b, 22c, and the photoelectric switch body 4 of the reflection type photoelectric switch 1 and the transmission type photoelectric switch 6 are respectively incorporated. The projector 7 and the light receiver 8 are housed in the housing.
【０００８】[0008]
【発明が解決しようとする課題】ところで、このように
構成される光電スイッチ１、６は、前記したように、種
々の分野で使用され、その検出範囲も数センチ程度と極
めて小さい自動機器装置などにも適用されており、光電
スイッチ装置本体の小型、軽量化と共に、そのコスト低
減が要請されていた。By the way, the photoelectric switches 1 and 6 configured as described above are used in various fields as described above, and the detection range thereof is extremely small such as several centimeters. The photoelectric switch device body is required to be smaller and lighter and the cost to be reduced.
【０００９】しかしながら、従来この種光電スイッチ
は、上記各回路構成部品の小型化や基板搭載部品の高密
度化などにより対処されてきたが、部品各個での対応に
は限界があり、また部品点数も多く、組立工数を要する
ため、上記光電スイッチ装置の小型、軽量化やコスト低
減の要請に対処し難い状況にあった。However, conventionally, this kind of photoelectric switch has been dealt with by miniaturizing each of the above-mentioned circuit components and increasing the density of the components mounted on the board, but there is a limit to the correspondence of each component, and the number of components is large. However, it is difficult to meet the demands for downsizing, weight reduction and cost reduction of the above photoelectric switch device, because it requires many assembling steps.
【００１０】そこで、本発明者らは、ＬＥＤ素子と発振
回路を含む主要電気回路を一体に組込んだホトＩＣを作
成して、部品を集約化することにより、上記問題を解決
しようと考えた。Therefore, the inventors of the present invention considered to solve the above-mentioned problem by making a photo IC in which a main electric circuit including an LED element and an oscillation circuit is integrated and integrating the parts. .
【００１１】本発明者らは、種々検討した結果、上記問
題を解決する新規な発振回路内蔵型の光電スイッチ用Ｌ
ＥＤ装置を得ることが出来たものである。As a result of various studies, the inventors of the present invention have solved the above problems by using a novel oscillation circuit built-in type L for an optical switch.
It was possible to obtain an ED device.
【００１２】まず、本発明の発振回路内蔵型の光電スイ
ッチ用ＬＥＤ装置は、光電スイッチが、前記したよう
に、対象の検出物が大小種々あり、それぞれ適応した発
光周期の光電スイッチが用いられる。このため、内蔵す
る発振回路は発振周期が外部設定により可変できるこ
と。また、パルス幅一定の場合、発振周期を変えると
デューティ比が変わるため、ＬＥＤ素子に流せるピーク
電流値がそれに対応して変化する。このため、発振周期
の増、減に対応して、ＬＥＤ素子に流すピーク電流値も
増、減して設定できること。尚、上記パルス幅を一定に
することについては、光電スイッチにあっては、パルス
幅は特に受光器との関係や、応答速度、投光電流などと
の兼合いがあり、所定範囲に固定して設定するように考
えた。First, in the photoelectric switch LED device of the present invention having a built-in oscillation circuit, as described above, the photoelectric switch has a variety of detection objects to be detected, and a photoelectric switch having an appropriate light emission cycle is used. Therefore, the oscillation cycle of the built-in oscillation circuit can be changed by external setting. Further, when the pulse width is constant, the duty ratio changes when the oscillation cycle is changed, so the peak current value that can be passed through the LED element changes correspondingly. Therefore, the peak current value flowing through the LED element can be set to increase or decrease according to the increase or decrease of the oscillation cycle. Regarding the above-mentioned constant pulse width, in the photoelectric switch, the pulse width has a relation with the light receiver, the response speed, the projection current, etc. I thought to set it.
【００１３】以上のおよびの要件を満たすことによ
り、作成された光電スイッチ用ＬＥＤ装置は、反射型、
透過型をとわず、各種の光電スイッチに適用出来、汎用
性の高いホトＩＣが作成できる。By satisfying the above requirements (1) and (2), the LED device for a photoelectric switch produced is of a reflection type,
It can be applied to various photoelectric switches regardless of the transmission type, and photo ICs with high versatility can be created.
【００１４】上記のような考えにより、本発明者らは、
先ず図８に示すような、発振回路内蔵型の光電スイッチ
用ＬＥＤ装置２３をホトＩＣで作成し、この光電スイッ
チ用ＬＥＤ装置２３を用いて光電スイッチ用投光器２４
を作成した。Based on the above idea, the present inventors have
First, as shown in FIG. 8, an oscillation circuit built-in type photoelectric switch LED device 23 is prepared by a photo IC, and the photoelectric switch LED device 23 is used to form a photoelectric switch projector 24.
It was created.
【００１５】即ち、図８は本発明の前提となる発振回路
内蔵型の光電スイッチ用ＬＥＤ装置２３を用いて作成し
た光電スイッチ用投光器２４のブロック回路図である。That is, FIG. 8 is a block circuit diagram of a floodlight 24 for a photoelectric switch, which is formed by using the LED device 23 for a photoelectric switch having a built-in oscillation circuit, which is a premise of the present invention.
【００１６】同図において、点線で囲んだ部分がホトＩ
Ｃで作成した光電スイッチ用ＬＥＤ装置２３であり、電
源端子２７ａに接続された投光素子のＬＥＤ素子２、Ｌ
ＥＤ素子２に直列接続された電流制限抵抗１０およびス
イッチング素子１１、スイッチング素子１１を所定周期
でスイッチングしてＬＥＤ素子２をパルス点灯する発振
回路１２、およびＬＥＤ素子２や発振回路１２に所定の
定電圧を付与する定電圧回路１５などを一体に組込んで
構成している。In the figure, the part surrounded by the dotted line is the photo I.
It is the LED device 23 for photoelectric switches created in C, and the LED elements 2 and L of the light projecting element connected to the power supply terminal 27a.
A current limiting resistor 10 and a switching element 11 connected in series to the ED element 2, an oscillation circuit 12 that switches the switching element 11 at a predetermined cycle to pulse-light the LED element 2, and a predetermined constant for the LED element 2 and the oscillation circuit 12. A constant voltage circuit 15 for applying a voltage and the like are integrated and configured.
【００１７】また、点線の外側の一点鎖線で囲んだ部分
には、ＬＥＤ素子２に高いパルス電流を付与するための
充放電回路１３、動作中を示す動作表示灯１４およびサ
ージ吸収素子２５と逆接続防止用ダイオード２６が配設
されている。Further, in a portion surrounded by a one-dot chain line outside the dotted line, the charging / discharging circuit 13 for giving a high pulse current to the LED element 2, the operation indicator lamp 14 indicating the operation, and the surge absorbing element 25 are opposite. A connection prevention diode 26 is provided.
【００１８】また、この光電スイッチ用ＬＥＤ装置２３
には、図示するように、４つの外付け用の接続端子２７
ａ〜２７ｄが配設されていて、発振回路１２に接続され
たコンデンサ端子２７ｃに外付けの周期可変用コンデン
サ２８が接続され、ＬＥＤ素子２に接続された抵抗端子
２７ｄに外付けのピーク電流設定用抵抗２９が接続され
ている。そして、ＬＥＤ素子２が接続された電源端子２
７ａに上記充放電回路１３が接続され、アース端子２７
ｂがアース接続されて、投光器２４が構成されている。Further, this photoelectric switch LED device 23
As shown in the figure, there are four external connection terminals 27.
a to 27d are provided, an external variable period capacitor 28 is connected to a capacitor terminal 27c connected to the oscillation circuit 12, and an external peak current setting is made to a resistor terminal 27d connected to the LED element 2. Resistance 29 is connected. And the power supply terminal 2 to which the LED element 2 is connected
The charging / discharging circuit 13 is connected to 7a, and the earth terminal 27
The b is grounded to form the projector 24.
【００１９】かかる構成の投光器２４はＬＥＤ素子２と
発振回路１２を含む主要回路を一体に組込んだ光電スイ
ッチ用ＬＥＤ装置２３を用いたから、組付けの部品点数
が極めて少なくなり、装置の小型、軽量化ができると共
に、組立が極めて簡単になる。また、外付けの周期可変
用コンデンサ２８と外付けのピーク電流設定用抵抗２９
とを、製作する投光器２４の規格要件に応じて適宜選定
することにより、投光用ＬＥＤ素子の発光周期とピーク
電流値を自由に設定できる。Since the projector 24 having such a structure uses the LED device 23 for a photoelectric switch in which a main circuit including the LED element 2 and the oscillation circuit 12 is integrally incorporated, the number of parts to be assembled is extremely small, and the device is small in size. The weight can be reduced, and the assembly is extremely easy. Further, an external period variable capacitor 28 and an external peak current setting resistor 29 are provided.
By appropriately selecting and according to the standard requirements of the projector 24 to be manufactured, it is possible to freely set the light emission cycle and the peak current value of the LED element for light projection.
【００２０】しかしながら、このように小型、軽量化と
組立の簡略化がされる発振回路内蔵型の光電スイッチ用
ＬＥＤ装置２３は、図９に示すように、電源端子２７
ａ、アース端子２７ｂ、コンデンサ端子２７ｃおよび抵
抗端子２７ｄの合計４本足のパッケージ３０が必要とな
り、パッケージに高価なカンケースタイプが必要となっ
て、そのコストメリットが低下する問題があった。However, as shown in FIG. 9, the LED device 23 for a photoelectric switch, which has a built-in oscillation circuit, can be reduced in size, weight, and simplified in assembly, as shown in FIG.
There is a problem in that the package 30 having a total of four legs including a, the ground terminal 27b, the capacitor terminal 27c, and the resistance terminal 27d is required, and an expensive can case type is required for the package, which lowers the cost merit.
【００２１】したがって、本発明は、上記問題点に鑑み
なされたものであり、３本足の廉価なパッケージが採用
でき、発振周期とピーク電流値が可変設定できる発振回
路内蔵型の光電スイッチ用ＬＥＤ装置を提供することを
目的としている。Therefore, the present invention has been made in view of the above-mentioned problems, and a low-priced package of three legs can be adopted, and an oscillation circuit built-in type LED for a photoelectric switch capable of variably setting an oscillation cycle and a peak current value. The purpose is to provide a device.
【００２２】[0022]
【課題を解決するための手段】このため、本発明は前記
のＬＥＤ素子に流すピーク電流値の可変設定の要件、
つまり、ＬＥＤ素子を点灯駆動する発振周期の増減に対
応して、ＬＥＤ素子に流せるピーク電流値が増減する機
能を、ＬＥＤ素子の点灯駆動回路に組込むように構成し
たものである。Therefore, according to the present invention, there is provided a requirement for variably setting the peak current value flowing through the LED element.
That is, the function of increasing / decreasing the peak current value that can be passed through the LED element in response to the increase / decrease in the oscillation cycle for driving the LED element to light up is incorporated in the LED element lighting drive circuit.
【００２３】すなわち、本発明の光電スイッチ用ＬＥＤ
装置は、ＬＥＤ素子と、ＬＥＤ素子に直列接続されたス
イッチング素子と、スイッチング素子を所定周期でスイ
ッチングして前記ＬＥＤ素子をパルス点灯する発振回路
とをケース内に一体に収納した光電スイッチ用ＬＥＤ装
置であって、前記光電スイッチ用ＬＥＤ装置は、外付け
されたコンデンサにより発振周期が可変される発振回路
と、この発振回路の発振パルスを受け、発振周期が大き
くなるに伴って大きくなる直流電圧を出力するＦ／Ｖ変
換回路と、前記発振回路のパルス発生毎に導通し、Ｆ／
Ｖ変換回路の直流電圧を前記スイッチング素子に印加す
るアナログスイッチとで構成され、前記スイッチング素
子は前記アナログスイッチの導通毎にスイッチングして
前記ＬＥＤ素子に前記直流電圧に比例した電流を流すよ
うに構成したことを特徴としている。That is, the LED for the photoelectric switch of the present invention
The device is a photoelectric switch LED device in which an LED element, a switching element connected in series to the LED element, and an oscillation circuit for switching the switching element at a predetermined cycle to pulse-light the LED element are integrally housed in a case. The photoelectric switch LED device receives an oscillation circuit whose oscillation cycle is variable by an externally attached capacitor and an oscillation pulse of this oscillation circuit, and receives a DC voltage which increases as the oscillation cycle increases. An F / V conversion circuit for outputting and conduction for each pulse generation of the oscillation circuit,
An analog switch that applies the DC voltage of the V conversion circuit to the switching element, and the switching element switches each time the analog switch is turned on so that a current proportional to the DC voltage is passed through the LED element. It is characterized by having done.
【００２４】[0024]
【作用】上記構成の光電スイッチ用ＬＥＤ装置は、外付
のコンデンサの容量を適宜に選定することにより、発振
回路の発振周波数を任意の値に設定でき、所望の周期で
ＬＥＤ素子を点灯駆動することができる。この場合、発
振周期を大きくなるように設定すると、Ｆ／Ｖ変換器に
より、スイッチ素子に印加される直流電圧が大きくなっ
て、ＬＥＤ素子に流れる電流を大きくする。逆に、発振
周期を小さくなるように設定すると、スイッチ素子に印
加される直流電圧が小さくなって、ＬＥＤ素子に流れる
電流が小さくなり、自動的に、発振周期と対応した所定
の点灯電流に設定される。また、外付けのピーク電流設
定用の抵抗が不要となり、電源端子、アース端子、コン
デンサ端子の３本足の安価なパッケージが適用でき、コ
ストメリットが得られる。In the photoelectric switch LED device having the above structure, the oscillation frequency of the oscillation circuit can be set to an arbitrary value by appropriately selecting the capacitance of the external capacitor, and the LED element is driven to light at a desired cycle. be able to. In this case, if the oscillation period is set to be large, the DC voltage applied to the switch element is increased by the F / V converter, and the current flowing through the LED element is increased. On the contrary, when the oscillation cycle is set to be small, the DC voltage applied to the switch element becomes small, the current flowing through the LED element becomes small, and the predetermined lighting current corresponding to the oscillation cycle is automatically set. To be done. In addition, an external resistor for setting the peak current is not required, and an inexpensive three-legged package including a power supply terminal, a ground terminal, and a capacitor terminal can be applied, and a cost advantage can be obtained.
【００２５】[0025]
【実施例】以下、本発明の実施例を図１および図２の図
面を参照して詳述する。Embodiments of the present invention will be described in detail below with reference to the drawings of FIGS.
【００２６】図１は本発明の光電スイッチ用ＬＥＤ装置
３１の外形を示す側面図であり、前記図９の光電スイッ
チ用ＬＥＤ装置２３と対応した図である。この光電スイ
ッチ用ＬＥＤ装置３１のパッケージ３２は、外付け用接
続端子に電源端子２７ａ、ア−ス端子２７ｂ、コンデン
サ端子２７ｃの３つの端子をもつ、三本足のパッケージ
が採用されている。FIG. 1 is a side view showing the outer shape of the photoelectric switch LED device 31 of the present invention, and is a view corresponding to the photoelectric switch LED device 23 of FIG. The package 32 of the photoelectric switch LED device 31 is a three-legged package having three terminals of a power supply terminal 27a, an earth terminal 27b, and a capacitor terminal 27c as external connection terminals.
【００２７】図２は上記光電スイッチ用ＬＥＤ装置３１
を用いて光電スイッチ用投光器３３に組込んだ投光器３
３のブロック回路であり、前記図８の投光器２４に対応
した図である。FIG. 2 shows the LED device 31 for the photoelectric switch.
Projector 3 incorporated in the projector 33 for photoelectric switch using
FIG. 9 is a block circuit of No. 3 and corresponds to the projector 24 of FIG. 8.
【００２８】同図において、点線で囲んだ部分が、ホト
ＩＣで作成した光電スイッチ用ＬＥＤ装置３１であり、
前記光電スイッチ用ＬＥＤ装置２３と同様に、電源端子
２７ａに接続されたＬＥＤ素子２、ＬＥＤ素子２に直列
接続された電流制限抵抗１０およびスイッチング素子１
１、スイッチング素子１１を所定周期でスイッチングし
てＬＥＤ素子２をパルス点灯する発振回路１２、および
ＬＥＤ素子２や発振回路１２に所定の定電圧を付与する
定電圧回路１５などを一体に組込んで構成している。In the figure, the portion surrounded by the dotted line is the photoelectric switch LED device 31 made of a photo IC,
Similar to the photoelectric switch LED device 23, the LED element 2 connected to the power supply terminal 27a, the current limiting resistor 10 and the switching element 1 connected in series to the LED element 2 are connected.
1. An oscillation circuit 12 for switching the switching element 11 at a predetermined cycle to light the LED element 2 in a pulsed manner, a constant voltage circuit 15 for applying a predetermined constant voltage to the LED element 2 and the oscillation circuit 12, and the like are integrally incorporated. I am configuring.
【００２９】また、点線の外側の一点鎖線で囲んだ部分
には、前記投光器２４と同様に、ＬＥＤ素子２に高いパ
ルス電流を付与するための充放電回路１３、動作中を示
す動作表示灯１４およびサージ吸収素子２５と逆接続防
止用ダイオード２６などの電源側部品や周辺部品が配設
されている。As in the case of the projector 24, a charging / discharging circuit 13 for applying a high pulse current to the LED element 2 and an operation indicator lamp 14 for indicating operation are provided in a portion surrounded by a chain line outside the dotted line. Power supply side components such as the surge absorbing element 25 and the reverse connection prevention diode 26 and peripheral components are arranged.
【００３０】そして、この光電スイッチ用ＬＥＤ装置３
１は、図示するように、３つの接続端子２７ａ〜２７ｃ
が配設されていて、発振回路１２に接続されたコンデン
サ端子２７ｃに外付けの周期可変用コンデンサ２８が接
続され、ＬＥＤ素子２の電源端子２７ａに電源用の充放
電回路１３が接続され、アース端子２７ｂがアースに接
続されている。Then, the LED device 3 for this photoelectric switch
As shown in the drawing, 1 indicates three connection terminals 27a to 27c.
Is provided, the external period changing capacitor 28 is connected to the capacitor terminal 27c connected to the oscillation circuit 12, the power supply charging / discharging circuit 13 is connected to the power supply terminal 27a of the LED element 2, and the ground is connected. The terminal 27b is connected to the ground.
【００３１】ここで、本発明の光電スイッチ用ＬＥＤ装
置３１と前記図８の光電スイッチ用ＬＥＤ装置２３と異
なる点は、前記光電スイッチ用ＬＥＤ装置２３がＬＥＤ
素子２に接続した外付け用の抵抗端子２７ｄを設け、こ
れにピーク電流設定用抵抗２９を接続して、この抵抗２
９によりＬＥＤ素子２に流す電流を可変するように構成
しているのに対して、本発明の光電スイッチ用ＬＥＤ装
置３１にはこれがなく、代わりに、発振回路１２とスイ
ッチング素子１１との間に、Ｆ／Ｖ変換回路３４、アナ
ログスイッチ３５を配設し、ＬＥＤ素子２に流す電流を
これらの回路により設定するように構成している点、及
び、コンデンサ端子２７ｃにコード３６を接続して、こ
れに投光停止スイッチ３７を配設した点のみである。Here, the difference between the photoelectric switch LED device 31 of the present invention and the photoelectric switch LED device 23 of FIG. 8 is that the photoelectric switch LED device 23 is an LED.
An external resistance terminal 27d connected to the element 2 is provided, and a peak current setting resistance 29 is connected to the resistance terminal 27d.
9 is configured to vary the current flowing through the LED element 2, whereas the photoelectric switch LED device 31 of the present invention does not have this, and instead, it is provided between the oscillation circuit 12 and the switching element 11. , An F / V conversion circuit 34, and an analog switch 35 are provided, and the current flowing through the LED element 2 is set by these circuits, and the cord 36 is connected to the capacitor terminal 27c, The only difference is that the light emission stop switch 37 is provided.
【００３２】即ち、上記Ｆ／Ｖ変換回路３４は、前段の
発振回路１２の発振パルスを受けて、その発振周期が大
きくなるに伴って大きくなる直流電圧をその出力端子に
出力するよう構成されている。That is, the F / V conversion circuit 34 is configured to receive the oscillation pulse of the oscillation circuit 12 at the preceding stage and output a DC voltage, which increases as the oscillation period increases, to its output terminal. There is.
【００３３】また、アナログスイッチ３５は、前記発振
回路１２のパルス発生毎に導通して、Ｆ／Ｖ変換回路３
４の直流電圧をスイッチング素子１１のベース・エミッ
タ間に印加して、スイッチング素子１１をスイッチング
するよう構成されている。The analog switch 35 is turned on each time the oscillator circuit 12 generates a pulse, and the F / V conversion circuit 3 is turned on.
The DC voltage of 4 is applied between the base and emitter of the switching element 11 to switch the switching element 11.
【００３４】上記構成において、いま、発振回路１２を
外付けの周期可変用コンデンサ２８を選定して、発振回
路１２の発振周期が大きくなるように設定したとする
と、Ｆ／Ｖ変換器３４の直流電圧も大きくなる。そし
て、この大きくされた直流電圧が、アナログスイッチ３
５が発振回路１２のパルス発生毎に導通することによ
り、スイッチング素子１１のベースに印加され、スイッ
チング素子１１はパルス発生毎にスイッチングし、ＬＥ
Ｄ素子２を同周期のパルスで点灯する。In the above configuration, assuming that the oscillation circuit 12 has an external period variable capacitor 28 selected and the oscillation period of the oscillation circuit 12 is set to be large, the direct current of the F / V converter 34 is changed. The voltage also increases. Then, this increased DC voltage is applied to the analog switch 3
5 is applied to the base of the switching element 11 when the oscillation circuit 12 is turned on each time the pulse is generated, the switching element 11 is switched every time the pulse is generated, and
The D element 2 is turned on with a pulse having the same cycle.
【００３５】ここで、スイッチング素子１１は、図３に
示すように、ベース・アース間電圧Ｖｂに対して略正比
例のコレクタ電流Ｉｃ特性があり、ベース・アース間に
印加される直流電圧が大きくなると、ＬＥＤ素子２に流
れる電流も大きくなるように構成されている。Here, as shown in FIG. 3, the switching element 11 has a collector current Ic characteristic which is substantially directly proportional to the base-ground voltage Vb, and when the DC voltage applied between the base-ground increases. The current flowing through the LED element 2 is also increased.
【００３６】また、逆に、発振周期を小さくなるように
外付けのコンデンサ２８を設定すると、今度はＦ／Ｖ変
換器３４の直流電圧が小さくなって、スイッチング素子
１１のベースに印加される直流電圧も小さくなって、Ｌ
ＥＤ素子２に流れる電流が小さくなる。On the contrary, if the external capacitor 28 is set so as to reduce the oscillation cycle, the DC voltage of the F / V converter 34 will decrease and the DC voltage applied to the base of the switching element 11 will decrease. The voltage also decreases, and L
The current flowing through the ED element 2 becomes small.
【００３７】次に、コンデンサ端子２７ｃのコード３６
に接続した投光停止スイッチ３７は、このスイッチ３７
を閉じると、発振回路１２のコンデンサが短絡され、発
振を停止する。したがって、投光器３３の装置設置時の
光軸調整や、異常調査時などに、この投光停止スイッチ
３７を操作することで発振停止でき、便利である。Next, the cord 36 of the capacitor terminal 27c
The light emission stop switch 37 connected to
When is closed, the capacitor of the oscillation circuit 12 is short-circuited and the oscillation is stopped. Therefore, it is convenient that the oscillation can be stopped by operating the light emission stop switch 37 when adjusting the optical axis of the light projector 33 when the device is installed or when investigating an abnormality.
【００３８】[0038]
【発明の効果】以上詳述したように、本発明によれば、
外付けのコンデンサの容量を適宜に選定することで所望
の周期でＬＥＤ素子を点灯することができる。また、発
振周期を設定すると、ＬＥＤ素子に流せるピーク電流値
が、その点灯駆動回路により自動的に設定できる。 ま
た、ピーク電流設定用の外付け抵抗が不要となり、電源
端子、アース端子、コンデンサ端子の３本足の安価なパ
ッケージが適用でき、コストメリットがえられる。ま
た、コンデンサ端子に接続した投光停止スイッチによ
り、簡単に装置の発振停止ができ、操作性の良い光電ス
イッチが提供できる。As described in detail above, according to the present invention,
By appropriately selecting the capacity of the externally attached capacitor, the LED element can be turned on in a desired cycle. Further, when the oscillation cycle is set, the peak current value that can flow in the LED element can be automatically set by the lighting drive circuit. In addition, an external resistor for setting the peak current is not required, and an inexpensive three-legged package including a power supply terminal, a ground terminal, and a capacitor terminal can be applied, resulting in a cost advantage. Moreover, the oscillation stop of the device can be easily stopped by the light emission stop switch connected to the capacitor terminal, and a photoelectric switch with good operability can be provided.
【図１】本発明の光電スイッチ用ＬＥＤ装置の側面図で
ある。FIG. 1 is a side view of an LED device for a photoelectric switch according to the present invention.
【図２】図１のＬＥＤ装置を用いた投光器のブロック回
路図である。FIG. 2 is a block circuit diagram of a projector using the LED device of FIG.
【図３】図１に回路部品で、スイッチング素子の特性図
である。FIG. 3 is a characteristic diagram of a switching element in the circuit component of FIG.
【図４】反射型光電スイッチの外観を示す斜視図であ
る。FIG. 4 is a perspective view showing an appearance of a reflective photoelectric switch.
【図５】透過型光電スイッチの外観を示す斜視図であ
る。FIG. 5 is a perspective view showing the appearance of a transmissive photoelectric switch.
【図６】光電スイッチの投光回路のブロック回路図であ
る。FIG. 6 is a block circuit diagram of a light projecting circuit of a photoelectric switch.
【図７】光電スイッチの受光回路のブロック回路図であ
る。FIG. 7 is a block circuit diagram of a light receiving circuit of a photoelectric switch.
【図８】本発明の前提となる光電スイッチ用ＬＥＤ装置
を用いた投光器のブロック回路図である。FIG. 8 is a block circuit diagram of a projector using an LED device for a photoelectric switch, which is a premise of the present invention.
【図９】図７の光電スイッチ用ＬＥＤ装置の側面図であ
る。9 is a side view of the photoelectric switch LED device of FIG. 7. FIG.
２ ＬＥＤ素子、投光素子 ３ フォトトランジスタ、受光素子 １１ スイッチング素子 １２ 発振回路 １５ 定電圧回路 ２７ｃ コンデンサ端子 ２８ 周期可変用コンデンサ ３１ 光電スイッチ用ＬＥＤ装置 ３２ パッケージ３２ ３３ 光電スイッチ用投光器 ３４ Ｆ／Ｖ変換回路 ３５ アナログスイッチ ３６ コード ３７ 投光停止スイッチ 2 LED element, light emitting element 3 Phototransistor, light receiving element 11 Switching element 12 Oscillation circuit 15 Constant voltage circuit 27c Capacitor terminal 28 Cycle changing capacitor 31 Photoelectric switch LED device 32 Package 32 33 Photoelectric switch projector 34 F / V conversion Circuit 35 Analog switch 36 Code 37 Light emission stop switch
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｈ０１Ｌ 33/00 Ｊ 7376−4Ｍ (72)発明者 槙野 節夫 大阪府大阪市北区曽根崎２丁目１番12号 北陽電機株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical indication location H01L 33/00 J 7376-4M (72) Inventor Setsuo Makino 2-1, Sonezaki, Kita-ku, Osaka-shi, Osaka No. 12 inside Hokuyo Electric Co., Ltd.
Claims (1)
たスイッチング素子と、スイッチング素子を所定周期で
スイッチングして前記ＬＥＤ素子をパルス点灯する発振
回路とをケース内に一体に収納した光電スイッチ用ＬＥ
Ｄ装置であって、 前記光電スイッチ用ＬＥＤ装置は、外付けされたコンデ
ンサにより発振周期が可変される発振回路と、この発振
回路の発振パルスを受け、発振周期が大きくなるに伴っ
て大きくなる直流電圧を出力するＦ／Ｖ変換回路と、前
記発振回路のパルス発生毎に導通し、Ｆ／Ｖ変換回路の
直流電圧を前記スイッチング素子に印加するアナログス
イッチとで構成され、前記スイッチング素子は前記アナ
ログスイッチの導通毎にスイッチングして前記ＬＥＤ素
子に前記直流電圧に比例した電流を流すように構成した
ことを特徴とする光電スイッチ用ＬＥＤ装置。1. A photoelectric switch in which an LED element, a switching element connected in series to the LED element, and an oscillation circuit for switching the switching element at a predetermined cycle to pulse-light the LED element are integrally housed in a case. LE
In the D device, the photoelectric switch LED device includes an oscillating circuit in which an oscillating cycle is varied by an externally attached capacitor, and a DC voltage which increases as the oscillating cycle increases when receiving an oscillating pulse of the oscillating circuit It is composed of an F / V conversion circuit that outputs a voltage and an analog switch that conducts each time the oscillator circuit generates a pulse and applies a DC voltage of the F / V conversion circuit to the switching element, and the switching element is the analog. An LED device for a photoelectric switch, characterized in that a current proportional to the DC voltage is caused to flow through the LED element by switching each time the switch is turned on.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14580193A JPH0722936A (en) | 1993-06-17 | 1993-06-17 | Led device for photoelectric switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14580193A JPH0722936A (en) | 1993-06-17 | 1993-06-17 | Led device for photoelectric switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0722936A true JPH0722936A (en) | 1995-01-24 |
Family
ID=15393472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14580193A Withdrawn JPH0722936A (en) | 1993-06-17 | 1993-06-17 | Led device for photoelectric switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0722936A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010177712A (en) * | 2004-06-30 | 2010-08-12 | Seoul Opto Devices Co Ltd | Light emitting element, method of manufacturing the same, and light emitting device using the same |
-
1993
- 1993-06-17 JP JP14580193A patent/JPH0722936A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010177712A (en) * | 2004-06-30 | 2010-08-12 | Seoul Opto Devices Co Ltd | Light emitting element, method of manufacturing the same, and light emitting device using the same |
| US8492775B2 (en) | 2004-06-30 | 2013-07-23 | Seoul Opto Device Co. Ltd. | Light emitting element with a plurality of cells bonded, method of manufacturing the same, and light emitting device using the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000905 |