JP5278276B2 - Ranging light source and ranging device using the same - Google Patents

Ranging light source and ranging device using the same Download PDF

Info

Publication number
JP5278276B2
JP5278276B2 JP2009235300A JP2009235300A JP5278276B2 JP 5278276 B2 JP5278276 B2 JP 5278276B2 JP 2009235300 A JP2009235300 A JP 2009235300A JP 2009235300 A JP2009235300 A JP 2009235300A JP 5278276 B2 JP5278276 B2 JP 5278276B2
Authority
JP
Japan
Prior art keywords
light
emitting diode
leads
diode chip
emitted
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.)
Expired - Fee Related
Application number
JP2009235300A
Other languages
Japanese (ja)
Other versions
JP2010010712A (en
Inventor
佐藤　　誠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Casio Computer Co Ltd
Original Assignee
Casio Computer Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Priority to JP2009235300A priority Critical patent/JP5278276B2/en
Publication of JP2010010712A publication Critical patent/JP2010010712A/en
Application granted granted Critical
Publication of JP5278276B2 publication Critical patent/JP5278276B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting diode that can emit light with little ghost light by eliminating reflection in the direction to a convex lens of a mold on leads of leaked light that is emitted to the direction opposite to the light emitting direction from an LED chip. <P>SOLUTION: The light emitting diode includes: a pair of leads 2, 3; an LED chip 4 mounted at one side of the leads 2, 3 with a light emitting face 4a directed opposite to the leads 2, 3, and connected to the pair of leads 2, 3; a mold 6 covering a portion where the LED chip is placed with a convex lens 7 formed for emitting light coming from the emitting face 4a of the LED chip 4 to the opposite face with small angle of divergence; and a non refractive light shield film 8 disposed in the mold 6 covering the face of the LED chip 4 side of the pair of leads 2, 3 for shielding the leaked light emitted from the circumferential face of the LED chip 4 and directed opposite to the light emitting face 4a in the light emitted from the LED chip 4. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

この発明は、測距用光源及びそれを用いた測距装置に関する。 The present invention relates to a distance measuring light source and a distance measuring apparatus using the same.

発光ダイオードは、例えばオートフォーカスカメラにおける被写体までの距離を測定するための測距装置の光源に利用されている（特許文献１、２、３、４参照）。   For example, the light emitting diode is used as a light source of a distance measuring device for measuring a distance to a subject in an autofocus camera (see Patent Documents 1, 2, 3, and 4).

特開平６―２６５３４６号公報JP-A-6-265346 特開平７―３５５４４号公報JP-A-7-35544 特開平７―６３５４９号公報JP 7-63549 A 特開２００１―３１１６１９号公報Japanese Patent Laid-Open No. 2001-311619

前記発光ダイオードは、一対のリードの一方の面側に、発光ダイオードチップ（以下、ＬＥＤチップと言う）を、その出射面を前記リードとは反対方向に向けるとともに前記一対のリードに接続して配置し、このＬＥＤチップの配置部を、前記ＬＥＤチップの出射面に対向する面に凸レンズ部が形成されたモールド体によりモールドしたものであり、前記ＬＥＤチップの出射面からの出射光を前記モールド体の凸レンズ部によりその広がり角を小さくして出射する。   The light-emitting diode is arranged on one surface side of a pair of leads with a light-emitting diode chip (hereinafter referred to as an LED chip) with its emission surface facing away from the leads and connected to the pair of leads. The LED chip placement portion is molded by a mold body having a convex lens portion formed on the surface facing the emission surface of the LED chip, and the emitted light from the emission surface of the LED chip is the mold body. The convex lens part emits light with a smaller divergence angle.

しかし、従来の発光ダイオードは、前記ＬＥＤチップが発する光のうち、このＬＥＤチップの出射面から出射した光が前記モールド体の凸レンズ部により広がり角が小さくなる方向に屈折されて出射するだけでなく、前記ＬＥＤチップの周面からこのＬＥＤチップの出射面とは反対方向に出射した漏れ光が前記リードにより前記凸レンズ部の方向に反射され、その反射光が前記凸レンズ部により前記ＬＥＤチップの出射面から出射した光とは異なる方向に屈折されてゴースト光となって出射するため、前記測距装置に、前記ゴースト光の影響による測定誤差を生じさせてしまう。   However, in the conventional light emitting diode, not only the light emitted from the LED chip but also the light emitted from the emission surface of the LED chip is refracted and emitted by the convex lens portion of the mold body in a direction in which the spread angle is reduced. Leaked light emitted from the peripheral surface of the LED chip in a direction opposite to the emission surface of the LED chip is reflected by the lead toward the convex lens portion, and the reflected light is reflected by the convex lens portion on the emission surface of the LED chip. Since the light is refracted in a direction different from the light emitted from the light and emitted as ghost light, the distance measuring device causes a measurement error due to the influence of the ghost light.

この発明は、ＬＥＤチップの出射面とは反対方向に出射した漏れ光のリードによるモールド体の凸レンズ部方向への反射を無くし、ゴースト光をほとんど含まない光を出射することができる発光ダイオードを提供するとともに、その発光ダイオードを用いた、精度の高い距離測定を行なうことができる測距用光源及び測距装置を提供することを目的としたものである。   The present invention provides a light emitting diode capable of emitting light containing almost no ghost light by eliminating the reflection of leakage light emitted in the direction opposite to the emitting surface of the LED chip toward the convex lens portion of the mold body. In addition, an object of the present invention is to provide a distance measuring light source and a distance measuring device that can perform distance measurement with high accuracy using the light emitting diode.

この発明の測距用光源は、一対のリードと、これらのリードの一方の面側に、出射面を前記リードとは反対方向に向けて配置され、前記一対のリードに接続されたＬＥＤチップと、前記ＬＥＤチップの配置部をモールドし、且つ前記ＬＥＤチップの出射面に対向する面に前記ＬＥＤチップの出射面からの出射光をその広がり角を小さくして出射する凸レンズ部が形成されたモールド体と、前記モールド体の前記凸レンズ部以外の部分において、凸レンズ部のレンズ軸に対して直交する方向に前記出射面側を凸とした角錐形状または円錐形状で前記ＬＥＤチップ部分を除く前記モールド体を断面する断面形状を有して設けられ、前記ＬＥＤチップが発する光のうち、このＬＥＤチップの周面から前記出射面とは反対方向の前記一対のリード上に向かって出射した漏れ光を遮る非反射性の遮光膜と、前記ＬＥＤチップの出射側に配置され、前記ＬＥＤチップから前記モールド体の凸レンズ部により広がり角が小さくなる方向に屈折されて出射した光を平行光に補正して出射する投射レンズとを備えたことを特徴とする。 The distance measuring light source according to the present invention includes a pair of leads and an LED chip disposed on one surface side of these leads with the emission surface facing away from the leads and connected to the pair of leads. A mold in which the arrangement portion of the LED chip is molded, and a convex lens portion is formed on the surface facing the emission surface of the LED chip to emit the emitted light from the emission surface of the LED chip with a reduced divergence angle. And the mold body excluding the LED chip part in a pyramid shape or a conical shape in which the exit surface side is convex in a direction orthogonal to the lens axis of the convex lens part in a part other than the convex lens part of the body and the mold body the provided having a cross-sectional shape to cross-section, wherein among the light emitted from the LED chip is emitted, the emission surface opposite direction of the pair of the leads from the peripheral surface of the LED chip A non-reflective light-shielding film for shielding the leakage light selfish emitted, disposed on the emission side of the LED chip, the light emitted is refracted in the direction in which the divergence angle is reduced by the convex lens portion of the mold body from the LED chip And a projection lens that emits light after being corrected to parallel light .

また、前記遮光膜は、前記一対のリードと交差する部分にそれぞれリード通し孔を設け、前記一対のリードは、当該リード通し孔に挿通して配置されることが望ましい。In addition, it is preferable that the light shielding film is provided with a lead through hole at a portion intersecting with the pair of leads, and the pair of leads are inserted through the lead through holes.

さらに、前記遮光膜は、そのＬＥＤチップ側の部分を前記ＬＥＤチップの出射面のうち、前記ＬＥＤチップの発光部の周囲部分に対応する領域に重ねて形成するのが好ましい。 Furthermore, it is preferable that the light shielding film is formed such that a portion on the LED chip side is overlapped with a region corresponding to a peripheral portion of the light emitting portion of the LED chip on the emission surface of the LED chip.

さらに、この発明の測距装置は、前記発明の発光ダイオードと、その出射側に配置され、前記発光ダイオードから前記モールド体の凸レンズ部により広がり角が小さくなる方向に屈折されて出射した光を平行光に補正して出射する投射レンズと、前記発光ダイオードの側方に配置され、前記投射レンズから出射し、測距対象物により反射された戻り光を受光してその信号を出力する光センサとを備えたことを特徴とする。   Further, the distance measuring device of the present invention is parallel to the light emitting diode of the present invention and light emitted from the light emitting diode by being refracted in a direction in which a divergence angle is reduced by the convex lens portion of the mold body. A projection lens that corrects and emits light; and an optical sensor that is disposed on the side of the light-emitting diode, receives return light that is emitted from the projection lens and reflected by a distance measuring object, and outputs the signal. It is provided with.

この発明の測距装置は、前記光センサに、前記投射レンズからの光の出射方向に対して交差する方向に配列した複数の光電変換素子を備え、前記投射レンズから出射して測距対象物により反射され、前記投射レンズから前記測距対象物までの距離に対応した角度で前記光センサに向かって戻った光を、前記複数の光電変換素子のうちの前記戻り光の入射点の光電変換素子により受光してその信号を出力するものを用いて三角測距を行なうものに好適である。   The distance measuring apparatus of the present invention includes a plurality of photoelectric conversion elements arranged in a direction intersecting with an emission direction of light from the projection lens in the optical sensor, and is emitted from the projection lens to be a distance measurement object. Photoelectric conversion of the return light incident point of the plurality of photoelectric conversion elements, the light reflected toward the optical sensor at an angle corresponding to the distance from the projection lens to the distance measuring object. It is suitable for a device that performs triangulation using a device that receives light by an element and outputs the signal.

この発明の測距装置において、遮光膜は、前記一対のリードと交差する部分にそれぞれリード通し孔を設け、前記一対のリードは、当該リード通し孔に挿通して配置されるのが望ましい。 In the distance measuring apparatus according to the present invention, it is preferable that the light shielding film is provided with a lead through hole at a portion intersecting with the pair of leads, and the pair of leads are inserted through the lead through holes.

さらに、この発明の測距装置において、前記発光ダイオードの遮光膜は、そのＬＥＤチップ側の部分を前記ＬＥＤチップの出射面のうち、前記ＬＥＤチップの発光部の周囲部分に対応する領域に重ねて形成するのが好ましい。 Furthermore, in the distance measuring device according to the present invention, the light-shielding film of the light-emitting diode has a portion on the LED chip side overlapped with an area corresponding to a peripheral portion of the light-emitting portion of the LED chip on the emission surface of the LED chip. Preferably formed.

本発明によれば、ＬＥＤチップの出射面とは反対方向に出射した漏れ光のリード上による反射を軽減し、ゴースト光をほとんど含まない光を出射することができる。According to the present invention, it is possible to reduce reflection on the lead of leakage light emitted in the direction opposite to the emission surface of the LED chip, and to emit light containing almost no ghost light.

この発明の第１の実施例を示す発光ダイオードの断面図。1 is a cross-sectional view of a light emitting diode showing a first embodiment of the present invention. 第１の実施例の発光ダイオードの一部切開正面図。FIG. 3 is a partially cut front view of the light emitting diode of the first embodiment. 第１の実施例の発光ダイオード１からの光の出射状態を示す図。The figure which shows the emission state of the light from the light emitting diode 1 of a 1st Example. 非反射性遮光膜を備えない発光ダイオードからの光の出射状態を示す図。The figure which shows the emission state of the light from the light emitting diode which is not provided with a non-reflective light shielding film. この発明の第２の実施例を示す発光ダイオードの断面図。Sectional drawing of the light emitting diode which shows 2nd Example of this invention. 第２の実施例の発光ダイオードの一部切開正面図。The partial cutaway front view of the light emitting diode of 2nd Example. この発明の第３の実施例を示す発光ダイオードの断面図。Sectional drawing of the light emitting diode which shows the 3rd Example of this invention. この発明の第４の実施例を示す発光ダイオードの断面図。Sectional drawing of the light emitting diode which shows 4th Example of this invention. この発明の測距用光源の一実施例を示す側面図。The side view which shows one Example of the light source for ranging of this invention. 非反射性遮光膜を備えない発光ダイオードを用いた測距用光源の側面図。The side view of the light source for ranging using the light emitting diode which is not provided with a non-reflective light shielding film. この発明の測距装置の一実施例を示す図。The figure which shows one Example of the distance measuring device of this invention.

図１及び図２はこの発明の第１の実施例を示す発光ダイオードの断面図及び一部切開正面図である。   1 and 2 are a sectional view and a partially cutaway front view of a light emitting diode according to a first embodiment of the present invention.

この発光ダイオード１は、一対のリード２，３と、これらのリード２，３の一方の面側に、出射面４ａを前記リード２，３とは反対方向に向けて配置され、前記一対のリード２，３に接続されたＬＥＤチップ４と、前記ＬＥＤチップ４の配置部をモールドし、且つ前記ＬＥＤチップ４の出射面４ａに対向する面に前記ＬＥＤチップ４の出射面４ａからの出射光をその広がり角を小さくして出射する凸レンズ部７が形成されたモールド体６と、前記モールド体６内に、前記一対のリード２，３のＬＥＤチップ４側の面を覆って設けられ、前記ＬＥＤチップ４が発する光のうち、このＬＥＤチップ４の周面から前記出射面とは反対方向に向かって出射した漏れ光を遮る非反射性遮光膜８とを備えている。   The light-emitting diode 1 is disposed on a pair of leads 2 and 3 and on one surface side of the leads 2 and 3 with the emission surface 4a facing away from the leads 2 and 3, and the pair of leads The LED chip 4 connected to 2 and 3 and the arrangement part of the LED chip 4 are molded, and the light emitted from the light emission surface 4a of the LED chip 4 is applied to the surface facing the light emission surface 4a of the LED chip 4. A mold body 6 formed with a convex lens portion 7 that emits light with a reduced divergence angle, and a surface of the pair of leads 2, 3 on the LED chip 4 side are provided in the mold body 6, and the LED Of the light emitted by the chip 4, a non-reflective light-shielding film 8 is provided to block leaked light emitted from the peripheral surface of the LED chip 4 in the direction opposite to the emission surface.

前記一対のリード２，３は、表面に半田メッキが施された鉄系金属からなっており、これらのリード２，３のうち、一方のリード２には、その一端部に、前記ＬＥＤチップ４の平面形状よりも若干大きい面積のチップ搭載部が形成されている。   The pair of leads 2 and 3 is made of an iron-based metal having a surface plated with solder, and one of the leads 2 and 3 is connected to one end of the LED chip 4. A chip mounting portion having an area slightly larger than the planar shape is formed.

前記ＬＥＤチップ４は、その構造は図示しないが、一方の面側の中心部にｐｎ接合面からなる点状の発光部を形成したチップ状半導体のｐ層及びｎ層にそれぞれ電極を設けたものであり、前記チップ状半導体の前記発光部側の面が出射面４ａとされている。   Although the structure of the LED chip 4 is not shown, an electrode is provided on each of the p-layer and n-layer of a chip-like semiconductor in which a dot-like light-emitting portion consisting of a pn junction surface is formed at the center on one surface side. The surface on the light emitting portion side of the chip-like semiconductor is an emission surface 4a.

このＬＥＤチップ４は、その出射面４ａとは反対面を前記一方のリード２の一端部に形成されたチップ搭載部の上に接着するとともに、一方の電極を前記一方のリード２の一端部に接続し、他方の電極を他方のリード３の一端部にリードワイヤ５を介して接続して配置されている。   The LED chip 4 is bonded to the chip mounting portion formed on one end of the one lead 2 with the opposite surface to the light emitting surface 4a, and one electrode is attached to one end of the one lead 2. The other electrode is connected to one end portion of the other lead 3 via a lead wire 5.

また、前記モールド体６は、エポキシ樹脂等の透明樹脂からなっており、その凸レンズ部７の軸線は、前記ＬＥＤチップ４の出射面からの出射光軸（出射面に垂直で且つ発光部ａの中心を通る線）に一致している。   The mold body 6 is made of a transparent resin such as an epoxy resin, and the axis of the convex lens portion 7 has an emission optical axis from the emission surface of the LED chip 4 (perpendicular to the emission surface and of the light emitting portion a). Line that passes through the center).

一方、前記非反射性遮光膜８は、例えば、前記モールド体６の凸レンズ部７以外の部分の前記凸レンズ部７の軸線に対して直交する方向の断面形状と略同じ外形を有し、その中心部に前記ＬＥＤチップ４の外周に密に嵌合する開口が形成された黒色の光吸収膜からなっており、この遮光膜８は、前記開口内に前記ＬＥＤチップ４を嵌合させて前記一対のリード２，３のＬＥＤチップ４側の面上に重ねられ、前記ＬＥＤチップ４及びリード２，３の一端部とともに前記モールド体６によりモールドされている。   On the other hand, the non-reflective light-shielding film 8 has, for example, substantially the same outer shape as the cross-sectional shape in the direction orthogonal to the axis of the convex lens portion 7 in the portion other than the convex lens portion 7 of the mold body 6. The light-shielding film 8 is formed of a black light-absorbing film in which an opening that closely fits to the outer periphery of the LED chip 4 is formed. The light-shielding film 8 is formed by fitting the LED chip 4 into the opening. The leads 2 and 3 are superimposed on the surface of the LED chip 4 side, and are molded by the mold body 6 together with the LED chip 4 and one ends of the leads 2 and 3.

この発光ダイオード１は、一対のリード２，３の一方の面側に、ＬＥＤチップ４を、その出射面４ａを前記リード２，３とは反対方向に向けて配置し、このＬＥＤチップ４の配置部を、前記ＬＥＤチップ４の出射面４ａに対向する面に凸レンズ部７が形成されたモールド体６によりモールドし、さらに前記モールド体６内に、前記一対のリード２，３のＬＥＤチップ４側の面を覆って、前記ＬＥＤチップ４が発する光のうち、このＬＥＤチップ４の周面から前記出射面４ａとは反対方向に向かって出射した漏れ光を遮る非反射性遮光膜８を設けたものであるため、前記ＬＥＤチップ４の周面から前記出射面４ａとは反対方向に出射した漏れ光の前記リード２，３による反射を無くし、前記凸レンズ部７からゴースト光をほとんど含まない光を出射することができる。   In the light emitting diode 1, the LED chip 4 is disposed on one surface side of the pair of leads 2 and 3, and the emitting surface 4a thereof is disposed in the direction opposite to the leads 2 and 3, and the LED chip 4 is disposed. Are molded by a mold body 6 in which a convex lens portion 7 is formed on a surface facing the emission surface 4a of the LED chip 4, and the LED chip 4 side of the pair of leads 2 and 3 is further formed in the mold body 6. A non-reflective light-shielding film 8 is provided to block leakage light emitted from the peripheral surface of the LED chip 4 in the direction opposite to the emission surface 4a out of the light emitted from the LED chip 4. Therefore, the leakage light emitted from the peripheral surface of the LED chip 4 in the direction opposite to the emission surface 4a is not reflected by the leads 2 and 3, and light containing almost no ghost light from the convex lens portion 7 is removed. It is possible to Cum.

すなわち、図３は上記実施例の発光ダイオード１からの光の出射状態を示し、図４は、前記非反射性遮光膜８を備えない発光ダイオード１ａからの光の出射状態を示している。   That is, FIG. 3 shows the light emission state from the light emitting diode 1 of the above embodiment, and FIG. 4 shows the light emission state from the light emitting diode 1a not provided with the non-reflective light shielding film 8.

まず、図４に示した非反射性遮光膜８を備えない発光ダイオード１ａからの光の出射について説明すると、この発光ダイオード１ａは、ＬＥＤチップ４が発する光のうち、このＬＥＤチップ４の出射面４ａから出射した光が、図４に実線で示したようにモールド体６の凸レンズ部７により広がり角が小さくなる方向に屈折されて出射するだけでなく、前記ＬＥＤチップ４の周面からこのＬＥＤチップ４の出射面４ａとは反対方向に出射した漏れ光が、図４に破線で示したようにリード２，３により前記凸レンズ部７の方向に反射され、その反射光が前記凸レンズ部７により前記ＬＥＤチップ４の出射面４ａから出射した光とは異なる方向に屈折されてゴースト光となって出射する。   First, the light emission from the light emitting diode 1a that does not include the non-reflective light shielding film 8 shown in FIG. 4 will be described. The light emitting diode 1a is the light emitting surface of the LED chip 4 out of the light emitted from the LED chip 4. The light emitted from 4a is not only refracted and emitted by the convex lens portion 7 of the molded body 6 in a direction in which the divergence angle is reduced as shown by the solid line in FIG. Leaked light emitted in the direction opposite to the emission surface 4 a of the chip 4 is reflected in the direction of the convex lens portion 7 by the leads 2 and 3 as indicated by broken lines in FIG. 4, and the reflected light is reflected by the convex lens portion 7. The light is refracted in a direction different from the light emitted from the emission surface 4a of the LED chip 4 and emitted as ghost light.

なお、図４には示していないが、前記ＬＥＤチップ４の周面から前記出射面４ａとは反対方向に出射した漏れ光には、前記リード２，３の側方を通過して前記モールド体後面、つまり凸レンズ部形成面とは反対面に向かう光もあり、非反射性遮光膜８を備えない発光ダイオード１ａは、その漏れ光が前記モールド体６の後面で内面反射（モールド体の後面と外気である空気層との界面で全反射）し、その反射光も前記凸レンズ部７により前記ＬＥＤチップ４の出射面４ａから出射した光とは異なる方向に屈折されてゴースト光となって出射する。   Although not shown in FIG. 4, leakage light emitted from the peripheral surface of the LED chip 4 in the direction opposite to the emission surface 4 a passes through the side of the leads 2 and 3 and the mold body. There is also light directed toward the rear surface, that is, the surface opposite to the convex lens portion forming surface, and the light emitting diode 1a that does not include the non-reflective light-shielding film 8 reflects the inner surface of the light emitting diode 1a on the rear surface of the mold body 6 (with the rear surface of the mold body). The reflected light is refracted by the convex lens portion 7 in a direction different from the light emitted from the emission surface 4a of the LED chip 4 and emitted as ghost light. .

それに対して、上記実施例の発光ダイオード１は、ＬＥＤチップ４が発する光のうち、このＬＥＤチップ４の出射面４ａから出射した光は、図３に実線で示したようにモールド体６の凸レンズ７により広がり角が小さくなる方向に屈折されて出射するが、前記ＬＥＤチップ４の周面から前記出射面４ａとは反対方向に出射した漏れ光は、非反射性遮光膜８により遮られるため、前記漏れ光がリード２，３により反射されて前記凸レンズ部７から出射することは無く、したがって、前記漏れ光の前記リード２，３による反射光、つまりゴースト光をほとんど含まない光を前記凸レンズ部７から出射することができる。   On the other hand, in the light-emitting diode 1 of the above embodiment, the light emitted from the emission surface 4a of the LED chip 4 out of the light emitted from the LED chip 4 is a convex lens of the mold body 6 as shown by the solid line in FIG. 7 is refracted and emitted in the direction in which the divergence angle becomes smaller, but the leaked light emitted from the peripheral surface of the LED chip 4 in the direction opposite to the emission surface 4a is blocked by the non-reflective light shielding film 8, The leaked light is not reflected by the leads 2 and 3 and is not emitted from the convex lens unit 7, and therefore, the reflected light of the leaked light by the leads 2 and 3, that is, light containing almost no ghost light is transmitted to the convex lens unit. 7 can be emitted.

しかも、この発光ダイオード１は、前記遮光膜８を、一対のリード２，３のモールド体６内の部分の略全体を覆って設けているため、前記ＬＥＤチップ４の周面から前記出射面４ａとは反対方向に出射した漏れ光のリード２，３による反射を略完全に無くし、よりゴースト光の少ない光を出射することができる。   Moreover, since the light-emitting diode 1 is provided with the light-shielding film 8 so as to cover substantially the entire portion of the pair of leads 2 and 3 in the molded body 6, the light-emitting diode 4 extends from the peripheral surface of the LED chip 4 to the emission surface 4 a. Reflection of the leaked light emitted in the opposite direction to the leads 2 and 3 is almost completely eliminated, and light with less ghost light can be emitted.

さらに、この発光ダイオード１は、前記遮光膜８の外形を前記モールド体６の凸レンズ部７以外の部分の前記凸レンズ部７の軸線に対して直交する方向の凸レンズ部７以外の部分の断面形状（凸レンズ部７の軸線に対して直交する方向の断面形状）と略同じにし、この遮光膜８を、ＬＥＤチップ４部分を除いて前記モールド体６の断面積の略全体にわたって設けているため、前記ＬＥＤチップ４の周面から前記出射面４ａとは反対方向に出射した漏れ光のうち、前記リード２，３の側方を通過した光の前記モールド体後面での内面反射も無くすことができ、したがって、さらにゴースト光の少ない光を出射することができる。   Further, the light-emitting diode 1 has a cross-sectional shape of the portion other than the convex lens portion 7 in the direction orthogonal to the axis of the convex lens portion 7 of the portion other than the convex lens portion 7 of the mold body 6. Substantially the same as the cross-sectional shape in the direction orthogonal to the axis of the convex lens portion 7), and the light-shielding film 8 is provided over substantially the entire cross-sectional area of the mold body 6 except for the LED chip 4 portion. Of the leaked light emitted from the peripheral surface of the LED chip 4 in the direction opposite to the emission surface 4a, it is possible to eliminate internal reflection on the rear surface of the mold body of the light passing through the sides of the leads 2 and 3, Therefore, light with less ghost light can be emitted.

なお、上記第１の実施例では、非反射性遮光膜８を、一対のリード２，３のモールド体６内の部分の略全体を覆って設けているが、ＬＥＤチップ４の周面からこのＬＥＤチップ４の出射面４ａとは反対方向に向かって出射し、リード２，３により反射された漏れ光のうち、前記モールド体６の凸レンズ部７に向かう反射光のほとんどは、リード２，３のＬＥＤチップ４の近傍の部分で反射された光であるため、前記遮光膜８は、前記ＬＥＤチップ４の周囲部分に、一対のリード２，３のＬＥＤチップ４側の面を覆って設けてもよく、このようにしても、前記漏れ光のリード２，３による前記凸レンズ部７方向への反射をほとんど無くし、ゴースト光の少ない光を出射することができる。   In the first embodiment, the non-reflective light shielding film 8 is provided so as to cover substantially the entire portion of the pair of leads 2 and 3 in the mold body 6. Of the leaked light that is emitted in the direction opposite to the emission surface 4 a of the LED chip 4 and reflected by the leads 2 and 3, most of the reflected light directed to the convex lens portion 7 of the mold body 6 is the leads 2 and 3. The light-shielding film 8 is provided on the peripheral portion of the LED chip 4 so as to cover the surface of the pair of leads 2 and 3 on the LED chip 4 side. In this case, too, reflection of the leaked light in the direction of the convex lens portion 7 by the leads 2 and 3 can be almost eliminated, and light with little ghost light can be emitted.

図５及び図６はこの発明の第２の実施例を示す発光ダイオードの断面図及び一部切開正面図であり、この実施例の発光ダイオード１は、非反射性遮光膜８を、モールド体６の凸レンズ部７以外の部分の断面形状（凸レンズ部７の軸線に対して直交する方向の断面形状）と略同じ外形を有し、頂部にＬＥＤチップ４の外周に密に嵌合する開口が形成された角錐面状または円錐面状に形成し、この遮光膜８を、その頂部付近の領域、つまりＬＥＤチップ４の周囲部分に対応する領域で一対のリード２，３のＬＥＤチップ４側の面を覆って配置したものである。   5 and 6 are a sectional view and a partially cutaway front view of a light emitting diode according to a second embodiment of the present invention. The light emitting diode 1 of this embodiment has a non-reflective light shielding film 8 and a molded body 6. Has an outer shape that is substantially the same as the cross-sectional shape of the portion other than the convex lens portion 7 (the cross-sectional shape in the direction orthogonal to the axis of the convex lens portion 7), and an opening that fits closely to the outer periphery of the LED chip 4 is formed at the top. The light-shielding film 8 is formed in a region near the top, that is, a region corresponding to the peripheral portion of the LED chip 4, and the surface on the LED chip 4 side of the pair of leads 2 and 3. It is arranged to cover.

なお、この実施例では、前記角錐面状または円錐面状の遮光膜８の傾斜面の一対のリード２，３と交差する部分にそれぞれリード通し孔を設け、この遮光膜８を、前記リード通し孔に前記リード２，３を挿通して配置している。   In this embodiment, a lead-through hole is provided in each of the portions of the inclined surface of the pyramid-shaped or conical light-shielding film 8 that intersects the pair of leads 2 and 3, and the light-shielding film 8 is connected to the lead-through film. The leads 2 and 3 are inserted through the holes.

この発光ダイオード１は、一対のリード２，３のＬＥＤチップ４の近傍の部分を非反射性遮光膜８により覆っているため、前記ＬＥＤチップ４の周面からこのＬＥＤチップ４の出射面４ａとは反対方向に出射した漏れ光のリード２，３による反射をほとんど無くすとともに、前記遮光膜８の外形をモールド体６の凸レンズ部７以外の部分の断面形状と略同じにし、この遮光膜８を、ＬＥＤチップ４部分を除いて前記モールド体６の断面積の略全体にわたって設けているため、前記ＬＥＤチップ４の周面から前記出射面４ａとは反対方向に出射した漏れ光のうち、前記リード２，３の側方を通過した光のモールド体後面での内面反射も無くすことができ、したがって、前記凸レンズ部７からゴースト光をほとんど含まない光を出射することができる。   Since the light emitting diode 1 covers a portion of the pair of leads 2 and 3 in the vicinity of the LED chip 4 with a non-reflective light-shielding film 8, the LED chip 4 has a light emitting surface 4a extending from the peripheral surface of the LED chip 4. Substantially eliminates reflection of the leaked light emitted in the opposite direction by the leads 2 and 3, and makes the outer shape of the light shielding film 8 substantially the same as the cross-sectional shape of the portion other than the convex lens portion 7 of the mold body 6. Since the LED chip 4 part is provided over substantially the entire cross-sectional area of the mold body 6, the lead out of the leaked light emitted from the peripheral surface of the LED chip 4 in the direction opposite to the emission surface 4 a. It is possible to eliminate internal reflection of the light that has passed through the sides of the mold 3 at the rear surface of the mold body. Therefore, it is possible to emit light containing almost no ghost light from the convex lens portion 7. That.

図７はこの発明の第３の実施例を示す発光ダイオードの断面図であり、この実施例の発光ダイオード１は、非反射性遮光膜８の外形をモールド体６の凸レンズ部７以外の部分の前記凸レンズ部７の軸線に対して直交する方向の凸レンズ部７以外の部分の断面形状と略同じにし、この遮光膜８を一対のリード２，３のモールド体６内の部分の略全体を覆って設けるとともに、この遮光膜８のＬＥＤチップ４側の部分を、前記ＬＥＤチップ４の出射面４ａのうち、前記ＬＥＤチップ４の中心部の発光部に対応する部分を除く外周領域に重ねて形成したものである。   FIG. 7 is a cross-sectional view of a light emitting diode according to a third embodiment of the present invention. In the light emitting diode 1 of this embodiment, the outer shape of the non-reflective light-shielding film 8 is the portion of the molded body 6 other than the convex lens portion 7. The cross-sectional shape of the portion other than the convex lens portion 7 in the direction orthogonal to the axis of the convex lens portion 7 is made substantially the same, and the light shielding film 8 covers substantially the entire portion of the pair of leads 2 and 3 in the mold body 6. And a portion of the light-shielding film 8 on the LED chip 4 side is formed so as to overlap an outer peripheral region of the light emission surface 4a of the LED chip 4 excluding a portion corresponding to the light emitting portion at the center of the LED chip 4. It is a thing.

この実施例の発光ダイオード１によれば、前記ＬＥＤチップ４の周面から前記出射面４ａとは反対方向に出射した漏れ光のリード２，３による反射と、前記漏れ光のうちの前記リード２，３の側方を通過した光のモールド体後面での内面反射とを無くすとともに、前記ＬＥＤチップ４の出射面４ａの前記発光部に対応する部分だけから光を出射させ、さらにゴースト光の少ない光を出射することができる。   According to the light-emitting diode 1 of this embodiment, the reflection of the leakage light emitted from the peripheral surface of the LED chip 4 in the direction opposite to the emission surface 4a by the leads 2 and 3 and the lead 2 of the leakage light. , 3, the inner reflection of the light on the rear surface of the mold body is eliminated, and the light is emitted only from the portion corresponding to the light emitting portion of the emission surface 4 a of the LED chip 4. Light can be emitted.

すなわち、前記ＬＥＤチップ４は、その発光部からの光を記出射面４ａから直接出射するとともに、前記発光部からＬＥＤチップ内に向かう光を、その出射面４ａとは反対面での内面反射またはリード２面での反射及びＬＥＤチップ４の周面での内面反射により前記出射面４ａに入射させてこの出射面４ａから出射するが、その光には、前記出射面４ａから直接出射する光に対して大きくずれた方向に出射する迷光もあり、この迷光が、モールド体６の凸レンズ部７により前記ＬＥＤチップ４の出射面４ａから直接出射した光とは異なる方向に屈折されてゴースト光となる。   That is, the LED chip 4 directly emits the light from the light emitting portion from the light emitting surface 4a, and reflects the light that travels from the light emitting portion into the LED chip on the surface opposite to the light emitting surface 4a. The light is incident on the emission surface 4a by the reflection on the surface of the lead 2 and the internal reflection on the peripheral surface of the LED chip 4, and is emitted from the emission surface 4a. The light is directly emitted from the emission surface 4a. There is also stray light that is emitted in a direction greatly deviated, and this stray light is refracted in a direction different from the light directly emitted from the emission surface 4 a of the LED chip 4 by the convex lens portion 7 of the mold body 6 to become ghost light. .

しかし、この実施例の発光ダイオード１は、前記遮光膜８のＬＥＤチップ４側の部分を、前記ＬＥＤチップ４の出射面４ａのうち、前記ＬＥＤチップ４の発光部に対応する部分を除く領域に重ねて形成しているため、前記ＬＥＤチップ４の出射面４ａの発光部に対応する部分だけから光を出射させることができ、したがって、前記迷光の出射をほとんど無くし、さらにゴースト光の少ない光を出射することができる。   However, in the light-emitting diode 1 of this embodiment, the portion of the light-shielding film 8 on the LED chip 4 side is the region excluding the portion corresponding to the light-emitting portion of the LED chip 4 on the emission surface 4a of the LED chip 4. Since they are formed in an overlapping manner, light can be emitted only from the portion corresponding to the light emitting portion of the emission surface 4a of the LED chip 4, and therefore, the emission of the stray light is almost eliminated, and light with less ghost light is generated. Can be emitted.

図８はこの発明の第４の実施例を示す発光ダイオードの断面図であり、この実施例の発光ダイオード１は、非反射性遮光膜８を、一対のリード２，３のＬＥＤチップ４側の面上にモールド体６内の部分の略全体を覆って設けるとともに、モールド体後面にその全体にわたって光吸収膜９を設けたものであり、この発光ダイオード１によれば、前記ＬＥＤチップ４の周面から出射面４ａとは反対方向に出射した漏れ光のリード２，３による反射と前記モールド体後面での内面反射とを無くし、よりゴースト光の少ない光を出射することができる。   FIG. 8 is a cross-sectional view of a light emitting diode according to a fourth embodiment of the present invention. In the light emitting diode 1 of this embodiment, a non-reflective light shielding film 8 is formed on the LED chip 4 side of a pair of leads 2 and 3. The surface of the mold body 6 is provided so as to cover substantially the entire portion of the mold body 6, and the light absorption film 9 is provided on the entire rear surface of the mold body. According to the light emitting diode 1, the periphery of the LED chip 4 is provided. Reflection of leakage light emitted from the surface in the direction opposite to the emission surface 4a by the leads 2 and 3 and internal reflection at the rear surface of the mold body can be eliminated, and light with less ghost light can be emitted.

前記発光ダイオード１は、例えばオートフォーカスカメラの測距装置等、測距対象物（オートフォーカスカメラの場合は被写体）までの距離を測定するための測距装置の光源に利用される。   The light emitting diode 1 is used as a light source of a distance measuring device for measuring a distance to a distance measuring object (a subject in the case of an auto focus camera) such as a distance measuring device of an auto focus camera.

図９はこの発明の測距用光源の一実施例を示しており、この実施例の測距用光源は、前記第１の実施例の発光ダイオード１と、その出射側に配置され、前記発光ダイオード１のＬＥＤチップ４の出射面４ａから出射し、前記モールド体６の凸レンズ部７により広がり角が小さくなる方向に屈折されて出射した光を平行光に補正して出射する投射レンズ１０とを備えたものである。   FIG. 9 shows an embodiment of a distance measuring light source according to the present invention. The distance measuring light source of this embodiment is disposed on the light emitting diode 1 of the first embodiment and on the emission side thereof, and emits the light. A projection lens 10 that emits light that is emitted from the emission surface 4a of the LED chip 4 of the diode 1 and is refracted in a direction in which the divergence angle is reduced by the convex lens portion 7 of the mold body 6 to be parallel light; It is provided.

なお、この測距用光源は、オートフォーカスカメラに実装される被写体までの距離を測定するための赤外線測距装置に利用されるものであり、前記発光ダイオード１のＬＥＤチップ４は、赤外線光を発するチップ状半導体を備えている。   The distance measuring light source is used in an infrared distance measuring device for measuring a distance to a subject mounted on an autofocus camera, and the LED chip 4 of the light emitting diode 1 emits infrared light. A chip-like semiconductor is provided.

この測距用光源は、前記第１の実施例の発光ダイオード１の出射側に前記投射レンズ１０を配置したものであるため、前記発光ダイオード１からゴースト光をほとんど含まない光を出射させ、その光を前記投射レンズ１０により平行光に補正して出射することができ、したがって、この測距用光源を測距装置に利用することにより、精度の高い距離測定を行なうことができる。   Since the distance measuring light source has the projection lens 10 disposed on the light emitting diode 1 emitting side of the first embodiment, the light emitting diode 1 emits light containing almost no ghost light. Light can be emitted after being corrected to parallel light by the projection lens 10. Therefore, by using this distance measuring light source for the distance measuring device, distance measurement with high accuracy can be performed.

すなわち、図１０は、非反射性遮光膜８を備えない発光ダイオード１ａを用いた測距用光源を示しており、前記非反射性遮光膜８を備えない発光ダイオード１ａは、図４に示したように、ＬＥＤチップ４の出射面４ａから出射し、モールド体６の凸レンズ部７により広がり角を小さくされた正規光と、前記ＬＥＤチップ４の周面から出射面４ａとは反対方向に出射した漏れ光の反射光が前記凸レンズ部７により前記正規光とは異なる方向に屈折されたゴースト光とを出射する。   That is, FIG. 10 shows a light source for distance measurement using the light emitting diode 1a not provided with the non-reflective light shielding film 8, and the light emitting diode 1a not provided with the non-reflective light shielding film 8 is shown in FIG. As described above, the normal light emitted from the emission surface 4a of the LED chip 4 and the spread angle of which is reduced by the convex lens portion 7 of the mold body 6 is emitted in the direction opposite to the emission surface 4a from the peripheral surface of the LED chip 4. The reflected light of the leaked light is emitted as ghost light refracted by the convex lens portion 7 in a direction different from the normal light.

そのため、この測距用光源では、前記発光ダイオード１ａからの正規光が図１０に実線で示したように投射レンズ１０により平行光に補正されて出射するだけでなく、前記発光ダイオード１ａからのゴースト光が図１０に破線で示したように前記投射レンズ１０により前記平行光とは異なる方向に出射し、測距装置に、前記ゴースト光の影響による測定誤差を生じさせてしまう。   For this reason, in this distance measuring light source, the regular light from the light emitting diode 1a is not only corrected by the projection lens 10 into parallel light as shown by the solid line in FIG. 10, but also emitted from the light emitting diode 1a. Light is emitted from the projection lens 10 in a direction different from the parallel light as indicated by a broken line in FIG. 10, causing a measurement error due to the influence of the ghost light in the distance measuring device.

それに対し、前記第１の実施例の発光ダイオード１の出射側に投射レンズ１０を配置した測距用光源は、前記発光ダイオード１からの出射光が図３に示したようにゴースト光をほとんど含まない光であり、その光が図９に実線で示したように投射レンズ１０により平行光に補正されて出射するため、この測距用光源を測距装置に利用することにより、精度の高い距離測定を行なうことができる。   On the other hand, in the distance measuring light source in which the projection lens 10 is arranged on the emission side of the light emitting diode 1 of the first embodiment, the emission light from the light emitting diode 1 contains almost ghost light as shown in FIG. Since this light is corrected into parallel light by the projection lens 10 and emitted as shown by the solid line in FIG. 9, this distance measuring light source is used in the distance measuring device, so that the distance is high. Measurements can be made.

なお、上記実施例の測距用光源は、図１〜図３に示した第１の実施例の発光ダイオード１を用いたものであるが、発光ダイオード１は、図５及び図６に示した第２の実施例、図７に示した第３の実施例、図８に示した第４の実施例のものでもよく、その場合も、この測距用光源を測距装置に利用することにより、精度の高い距離測定を行なうことができる。   The distance measuring light source of the above embodiment uses the light emitting diode 1 of the first embodiment shown in FIGS. 1 to 3, and the light emitting diode 1 is shown in FIGS. The second embodiment, the third embodiment shown in FIG. 7, and the fourth embodiment shown in FIG. 8 may be used. In this case, the distance measuring light source is used in the distance measuring device. Highly accurate distance measurement can be performed.

また、この発明の測距用光源は、オートフォーカスカメラの測距装置に限らず、他の測距装置の光源にも利用することもできる。   The distance measuring light source of the present invention is not limited to the distance measuring device of the autofocus camera, but can also be used for the light source of other distance measuring devices.

図１１はこの発明の測距装置の一実施例を示しており、この測距装置は、前記第１〜第４のいずれかの実施例の発光ダイオード１と、その出射側に配置され、前記発光ダイオード１のＬＥＤチップ４の出射面４ａから出射し、前記モールド体６の凸レンズ部７により広がり角が小さくなる方向に屈折されて出射した光を平行光に補正して出射する投射レンズ１０と、前記発光ダイオード１の側方に十分な間隔をおいて配置され、前記投射レンズ１０から出射し、測距対象物Ａにより反射された戻り光を受光してその信号を出力する光センサ１１と、前記光センサ１１からの出力信号に基づいて測距対象物Ａまでの距離を判定する測距回路１４とを備えている。   FIG. 11 shows an embodiment of the distance measuring device according to the present invention. This distance measuring device is disposed on the light emitting diode 1 of any one of the first to fourth embodiments and on the emission side thereof. A projection lens 10 that emits light that is emitted from the emission surface 4a of the LED chip 4 of the light-emitting diode 1 and refracted in a direction in which the divergence angle is reduced by the convex lens portion 7 of the mold body 6 to be parallel light; An optical sensor 11 which is arranged on the side of the light emitting diode 1 with a sufficient interval, receives the return light emitted from the projection lens 10 and reflected by the distance measuring object A, and outputs the signal; A distance measuring circuit 14 for determining a distance to the distance measuring object A based on an output signal from the optical sensor 11.

なお、この実施例の測距装置は、オートフォーカスカメラに実装される赤外線測距装置であり、前記発光ダイオード１のＬＥＤチップ４は、赤外線光を発するチップ状半導体を備えている。   The distance measuring device of this embodiment is an infrared distance measuring device mounted on an autofocus camera, and the LED chip 4 of the light emitting diode 1 includes a chip-like semiconductor that emits infrared light.

この測距装置において、前記光センサ１１は、一方の面に、複数の光電変換素子、例えばフォトダイオード１２を、前記投射レンズ１０からの光（平行光）の出射方向に対して交差する方向に１列に密に並べて配列形成したものであり、前記投射レンズから出射して測距対象物（以下、被写体と言う）Ａにより反射され、前記光センサ１１に対して前記投射レンズ１０から前記被写体Ａまでの距離に対応した角度方向から入射する戻り光を、前記複数のフォトダイオード１２のうちの前記戻り光の入射点のフォトダイオード１２により受光してその信号を出力する。   In the distance measuring apparatus, the optical sensor 11 has a plurality of photoelectric conversion elements, for example, photodiodes 12 on one surface, in a direction intersecting with an emission direction of light (parallel light) from the projection lens 10. It is formed by arranging closely in one row, is emitted from the projection lens, is reflected by a distance measuring object (hereinafter referred to as subject) A, and is projected from the projection lens 10 to the optical sensor 11. Return light incident from an angular direction corresponding to the distance to A is received by the photodiode 12 at the incident point of the return light among the plurality of photodiodes 12, and the signal is output.

この光センサ１１は、そのフォトダイオード形成面を前記投射レンズ１０からの出射光が向かう方向に向けて、フォトダイオード形成面が前記投射レンズ１０からの出射光の軸線Ｏに対して垂直になるように配置されており、したがって、この光センサ１１の複数のフォトダイオード１２は、前記投射レンズ１０からの出射光の軸線Ｏと直交する方向に配列している。   The optical sensor 11 has its photodiode forming surface directed in a direction in which the light emitted from the projection lens 10 is directed, and the photodiode forming surface is perpendicular to the axis O of the light emitted from the projection lens 10. Accordingly, the plurality of photodiodes 12 of the optical sensor 11 are arranged in a direction orthogonal to the axis O of the light emitted from the projection lens 10.

そして、前記光センサ１１の光入射側、つまりフォトダイオード形成面の前方には、前記被写体Ａにより反射された戻り光を集光させて前記フォトダイオード１２の受光面に入射させるセンサ側レンズ１３が配置されている。   A sensor side lens 13 that collects the return light reflected by the subject A and makes it incident on the light receiving surface of the photodiode 12 is provided on the light incident side of the optical sensor 11, that is, in front of the photodiode forming surface. Has been placed.

この測距装置は、三角測距を行なうものであり、前記発光ダイオード１から出射し、前記投射レンズ１０により平行光とされてこの投射レンズ１０から出射した光を被写体Ａに向けて投射することにより、前記被写体Ａにより反射され、前記投射レンズ１０から前記被写体Ａまでの距離に対応した角度方向から前記光センサ１１に向かって戻った光を、前記光センサ１１の複数のフォトダイオード１２のうちの前記戻り光の入射点に位置するフォトダイオード１２により受光し、その信号を前記光センサ１１から測距回路１４に出力する。   This distance measuring device performs triangulation, and projects the light emitted from the light emitting diode 1, converted into parallel light by the projection lens 10, and emitted from the projection lens 10 toward the subject A. The light reflected by the subject A and returned toward the photosensor 11 from the angle direction corresponding to the distance from the projection lens 10 to the subject A is, among the plurality of photodiodes 12 of the photosensor 11, Is received by the photodiode 12 located at the incident point of the return light, and the signal is output from the optical sensor 11 to the distance measuring circuit 14.

なお、前記被写体Ａにより反射された戻り光は、前記センサ側レンズ１３により集光され、前記光センサ１１の複数のフォトダイオード１２のうち、前記戻り光の入射点に位置するフォトダイオード１２に入射する。   The return light reflected by the subject A is collected by the sensor-side lens 13 and is incident on the photodiode 12 positioned at the return light incident point among the plurality of photodiodes 12 of the optical sensor 11. To do.

図１１において、実線は前記投射レンズ１０から被写体Ａまでの距離が短いときの光路、鎖線は前記投射レンズ１０から被写体Ａまでの距離が長いときの光路を示しており、前記投射レンズ１０から被写体Ａまでの距離が短いときは、前記被写体Ａにより反射された戻り光が前記光センサ１１の前記発光ダイオード１に近い側のフォトダイオード１２に入射し、前記投射レンズ１０から被写体Ａまでの距離が長いときは、前記被写体Ａにより反射された戻り光が前記光センサ１１の前記発光ダイオード１から遠い側のフォトダイオード１２に入射する。   In FIG. 11, a solid line indicates an optical path when the distance from the projection lens 10 to the subject A is short, and a chain line indicates an optical path when the distance from the projection lens 10 to the subject A is long. When the distance to A is short, the return light reflected by the subject A is incident on the photodiode 12 near the light emitting diode 1 of the optical sensor 11, and the distance from the projection lens 10 to the subject A is as follows. When it is long, the return light reflected by the subject A is incident on the photodiode 12 on the side farther from the light emitting diode 1 of the light sensor 11.

そして、前記光センサ１１は、その複数のフォトダイオード１２のうち、前記戻り光を受光したフォトダイオード１２の位置に対応する信号を測距回路１４に出力する。   Then, the optical sensor 11 outputs a signal corresponding to the position of the photodiode 12 that has received the return light among the plurality of photodiodes 12 to the distance measuring circuit 14.

一方、前記測距回路１４には前記投射レンズ１０からの出射光、つまり被写体投射光の軸線Ｏから前記光センサ１１の配置位置までの距離データが予め設定されており、この測距回路１４は、前記光センサ１１からの出力信号に基づいて、前記被写体投射光の軸線Ｏに対して直交する線上における前記軸線Ｏから前記光センサ１１の戻り光入射点までの距離と、前記光センサ１１に対する前記戻り光の入射角とを求め、これらの距離及び角度から三角測量の原理により前記被写体Ａまでの距離を判定し、その測距データを図示しないレンズ焦点調整部に出力する。   On the other hand, the distance measurement circuit 14 is preset with the distance data from the axis O of the light emitted from the projection lens 10, that is, the subject projection light, to the position where the photosensor 11 is arranged. Based on the output signal from the optical sensor 11, the distance from the axis O to the return light incident point of the optical sensor 11 on the line orthogonal to the axis O of the subject projection light, and the optical sensor 11 The incident angle of the return light is obtained, the distance to the subject A is determined from these distances and angles based on the principle of triangulation, and the distance measurement data is output to a lens focus adjustment unit (not shown).

この測距装置は、前記第１〜第４のいずれかの実施例の発光ダイオード１と、この発光ダイオード１からモールド体６の凸レンズ部７により広がり角が小さくなる方向に屈折されて出射した光を平行光に補正して出射する投射レンズ１０と、前記発光ダイオード１の側方に配置され、前記投射レンズ１０から出射し、測距対象物Ａにより反射された戻り光を受光してその信号を出力する光センサ１１とを備えたものであるため、前記発光ダイオード１からゴースト光をほとんど含まない光を出射させ、その光を前記投射レンズ１０により平行光に補正して出射して被写体Ａに投射することができ、したがって、前記被写体Ａにより反射された戻り光を前記光センサ１１に受光させることによる前記被写体Ａまでの距離測定を高い精度で行なうことができる。   The distance measuring device includes the light emitting diode 1 according to any one of the first to fourth embodiments and light emitted from the light emitting diode 1 by being refracted by the convex lens portion 7 of the mold body 6 so that the divergence angle is reduced. The projection lens 10 that emits light after correcting the light into parallel light, and the return light that is disposed on the side of the light emitting diode 1 and that is emitted from the projection lens 10 and reflected by the distance measuring object A receives the signal. Therefore, the light emitting diode 1 emits light containing almost no ghost light, and the light is corrected into parallel light by the projection lens 10 and emitted. Accordingly, the distance measurement to the subject A is performed with high accuracy by causing the optical sensor 11 to receive the return light reflected by the subject A. Door can be.

すなわち、この実施例の測距装置は、光センサ１１に、前記投射レンズ１０からの光の出射方向に対して交差する方向に配列した複数のフォトダイオード１２を備え、前記投射レンズ１０から出射して被写体Ａにより反射され、前記光センサ１１に対して前記投射レンズ１０から前記被写体Ａまでの距離に対応した角度方向から入射する戻り光を、前記複数のフォトダイオード１２のうちの前記戻り光の入射点のフォトダイオード１２により受光してその信号を出力するものを用いて三角測距を行なうものであり、この三角測距では、前記発光ダイオード１から出射し、前記投射レンズ１０により被写体Ａに投射される光がゴースト光を含んでいると、そのゴースト光が測距精度に影響するが、この測距装置によれば、前記発光ダイオード１からゴースト光をほとんど含まない光を出射させ、その光を前記投射レンズ１０により平行光に補正して出射して被写体Ａに投射することができるため、前記三角測距の精度を飛躍的に高くすることができる。   That is, the distance measuring apparatus of this embodiment includes a plurality of photodiodes 12 arranged in a direction intersecting the light emitting direction of the light from the projection lens 10 in the optical sensor 11, and is emitted from the projection lens 10. The return light reflected by the subject A and incident on the optical sensor 11 from an angle direction corresponding to the distance from the projection lens 10 to the subject A is converted into the return light of the plurality of photodiodes 12. Triangular distance measurement is performed by using the light received by the photodiode 12 at the incident point and outputting the signal. In this triangular distance measurement, the light is emitted from the light emitting diode 1 and is applied to the subject A by the projection lens 10. When the projected light includes ghost light, the ghost light affects the distance measurement accuracy. According to the distance measuring apparatus, the light emitting diode 1 Therefore, it is possible to emit light that contains almost no ghost light, correct the light into parallel light by the projection lens 10, emit the light, and project it onto the subject A. Therefore, the accuracy of the triangulation is greatly improved. can do.

前記測距装置において、前記発光ダイオード１の遮光膜８は、図１〜図３に示した第１の実施例のように、一対のリード２，３のモールド体６内の部分の略全体を覆って設けるのが望ましく、このようにすることにより、ＬＥＤチップ４の周面から出射面４ａとは反対方向に出射した漏れ光の前記リード２，３による反射を略完全に無くし、前記発光ダイオード１からよりゴースト光の少ない光を出射させて、より高精度の距離測定を行なうことができる。   In the distance measuring device, the light-shielding film 8 of the light emitting diode 1 covers substantially the entire portion of the pair of leads 2 and 3 in the mold body 6 as in the first embodiment shown in FIGS. It is desirable to cover the light emitting diode so that the reflection of the leaked light emitted from the peripheral surface of the LED chip 4 in the direction opposite to the emission surface 4a is almost completely eliminated by the light emitting diode. It is possible to perform distance measurement with higher accuracy by emitting light with less ghost light from 1.

また、前記測距装置において、前記発光ダイオード１の遮光膜８は、図５及び図６に示した第２の実施例のように、ＬＥＤチップ４部分を除いてモールド体６の断面積の略全体にわたって設けるのが望ましく、このようにすることにより、前記ＬＥＤチップ４の周面から出射面４ａとは反対方向に出射した漏れ光のうち、リード２，３の側方を通過した光のモールド体後面、つまり凸レンズ部形成面とは反対面での内面反射も無くして前記発光ダイオード１からさらにゴースト光の少ない光を出射させ、さらに高精度の距離測定を行なうことができる。   Further, in the distance measuring device, the light shielding film 8 of the light emitting diode 1 is substantially the same as the cross section of the molded body 6 except for the LED chip 4 portion as in the second embodiment shown in FIGS. It is desirable to provide the whole, and by doing so, the mold of the light that has passed through the sides of the leads 2 and 3 out of the leaked light emitted from the peripheral surface of the LED chip 4 in the direction opposite to the emission surface 4a. There is no inner surface reflection on the rear surface of the body, that is, the surface opposite to the convex lens portion forming surface, and light with less ghost light can be emitted from the light emitting diode 1 to perform more accurate distance measurement.

さらに、前記測距装置において、前記発光ダイオード１の遮光膜８は、図７に示した第３の実施例のように、ＬＥＤチップ４側の部分を前記ＬＥＤチップ４の出射面４ａのうち、前記ＬＥＤチップ４の発光部に対応する部分を除く領域に重ねて形成するのが好ましく、このようにすることにより、前記ＬＥＤチップ４の出射面４ａの前記発光部に対応する部分だけから光を出射させ、前記発光ダイオード１からさらにゴースト光の少ない光を出射させて、さらに高精度の距離測定を行なうことができる。   Furthermore, in the distance measuring device, the light shielding film 8 of the light emitting diode 1 is formed on the LED chip 4 side of the light emitting surface 4a of the LED chip 4 as in the third embodiment shown in FIG. Preferably, the LED chip 4 is formed so as to overlap with a region excluding the portion corresponding to the light emitting portion, and by doing so, light is emitted only from the portion corresponding to the light emitting portion of the emission surface 4a of the LED chip 4. The light can be emitted and light with less ghost light can be emitted from the light emitting diode 1, so that the distance can be measured with higher accuracy.

また、前記測距装置において、前記発光ダイオード１の遮光膜８は、図８に示した第４の実施例のように、一対のリード２，３のＬＥＤチップ４側の面上に形成してもよく、その場合は、前記モールド体６の凸レンズ部形成面とは反対面に光吸収膜９を設けることにより、前記ＬＥＤチップ４の周面から出射面４ａとは反対方向に出射した漏れ光の前記リード２，３による反射とモールド体後面での内面反射とを無くして前記発光ダイオード１からよりゴースト光の少ない光を出射させ、より高精度の距離測定を行なうことができる。   In the distance measuring apparatus, the light shielding film 8 of the light emitting diode 1 is formed on the surface of the pair of leads 2 and 3 on the LED chip 4 side as in the fourth embodiment shown in FIG. In this case, the light leakage film 9 is emitted from the peripheral surface of the LED chip 4 in the direction opposite to the emission surface 4a by providing the light absorbing film 9 on the surface opposite to the convex lens portion forming surface of the mold body 6. Thus, the reflection by the leads 2 and 3 and the inner surface reflection at the rear surface of the mold body are eliminated, and light with less ghost light is emitted from the light emitting diode 1, and more accurate distance measurement can be performed.

なお、図１１に示した測距装置は三角測距を行なうものであるが、この発明は、前記発光ダイオード１からモールド体６の凸レンズ部７により広がり角が小さくなる方向に屈折されて出射した光を投射レンズ１０により平行光に補正して出射し、被写体（測距対象物）Ａにより反射された戻り光を前記発光ダイオード１の側方に配置された光センサにより受光して、前記発光ダイオード１からの光出射と前記光センサへの戻り光入射との時間差に基づいて前記被写体Ａまでの距離を判定する時間差測距を行なう測距装置にも適用することができる。   Although the distance measuring device shown in FIG. 11 performs triangulation, the present invention is refracted and emitted from the light emitting diode 1 by the convex lens portion 7 of the mold body 6 in a direction in which the divergence angle becomes smaller. The light is corrected into parallel light by the projection lens 10 and emitted, and the return light reflected by the subject (object for distance measurement) A is received by the optical sensor arranged on the side of the light emitting diode 1 to emit the light. The present invention can also be applied to a distance measuring device that performs time difference ranging that determines the distance to the subject A based on the time difference between the light emission from the diode 1 and the return light incident on the optical sensor.

また、この発明の測距装置は、オートフォーカスカメラの測距装置に限らず、他の測距装置にも適用することができる。   Further, the distance measuring device of the present invention is not limited to the distance measuring device of the autofocus camera, but can be applied to other distance measuring devices.

１…発光ダイオード、２，３…リード、４…ＬＥＤチップ、４ａ…出射面、５…リードワイヤ、６…モールド体、７…凸レンズ部、８…非反射性遮光膜、９…光吸収膜、１０…投射レンズ、１１…光センサ、１２…フォトダイオード（光電変換素子）、１３…センサ側レンズ、１４…測距回路、Ａ…被写体（測距対象物）。   DESCRIPTION OF SYMBOLS 1 ... Light emitting diode, 2, 3 ... Lead, 4 ... LED chip, 4a ... Outgoing surface, 5 ... Lead wire, 6 ... Molding body, 7 ... Convex lens part, 8 ... Non-reflective light shielding film, 9 ... Light absorption film, DESCRIPTION OF SYMBOLS 10 ... Projection lens, 11 ... Optical sensor, 12 ... Photodiode (photoelectric conversion element), 13 ... Sensor side lens, 14 ... Ranging circuit, A ... Subject (ranging object).

Claims (7)

一対のリードと、これらのリードの一方の面側に、出射面を前記リードとは反対方向に向けて配置され、前記一対のリードに接続された発光ダイオードチップと、前記発光ダイオードチップの配置部をモールドし、且つ前記発光ダイオードチップの出射面に対向する面に前記発光ダイオードチップの出射面からの出射光をその広がり角を小さくして出射する凸レンズ部が形成されたモールド体と、前記モールド体の前記凸レンズ部以外の部分において、凸レンズ部のレンズ軸に対して直交する方向に前記出射面側を凸とした角錐形状または円錐形状で前記発光ダイオードチップ部分を除く前記モールド体を断面する断面形状を有して設けられ、前記発光ダイオードチップが発する光のうち、この発光ダイオードチップの周面から前記出射面とは反対方向の前記一対のリード上に向かって出射した漏れ光を遮る非反射性の遮光膜と、前記発光ダイオードチップの出射側に配置され、前記発光ダイオードチップから前記モールド体の凸レンズ部により広がり角が小さくなる方向に屈折されて出射した光を平行光に補正して出射する投射レンズとを備えたことを特徴とする測距用光源。   A pair of leads, a light emitting diode chip connected to the pair of leads, the light emitting diode chip disposed on one surface side of these leads with the emission surface facing away from the leads, and the arrangement portion of the light emitting diode chip And a mold body in which a convex lens portion is formed on the surface facing the light emission surface of the light emitting diode chip, and the light emitted from the light emission surface of the light emitting diode chip is emitted with a reduced divergence angle, and the mold A cross-section of the mold body excluding the light emitting diode chip portion in a pyramid shape or a cone shape with the exit surface side convex in a direction orthogonal to the lens axis of the convex lens portion in a portion other than the convex lens portion of the body Of the light emitted from the light-emitting diode chip, the light-emitting diode chip is provided with a shape from the peripheral surface of the light-emitting diode chip and the emission surface. A non-reflective light-shielding film that blocks leakage light emitted toward the pair of leads in the opposite direction and an emission angle of the light-emitting diode chip from the light-emitting diode chip by the convex lens portion of the mold body A distance measuring light source, comprising: a projection lens that corrects and emits light that is refracted and emitted in a direction in which the light becomes smaller. 遮光膜は、前記一対のリードと交差する部分にそれぞれリード通し孔を設け、前記一対のリードは、当該リード通し孔に挿通して配置されることを特徴とする請求項１に記載の測距用光源。   2. The distance measuring device according to claim 1, wherein the light shielding film is provided with lead through holes at portions intersecting with the pair of leads, and the pair of leads are disposed through the lead through holes. Light source. 遮光膜は、その発光ダイオードチップ側の部分を前記発光ダイオードチップの出射面のうち、前記発光ダイオードチップの発光部の周囲部分に対応する領域に重ねて形成されていることを特徴とする請求項１又は２に記載の測距用光源。   The light-shielding film is formed such that a portion on the light-emitting diode chip side is overlapped with a region corresponding to a peripheral portion of the light-emitting portion of the light-emitting diode chip, on the emission surface of the light-emitting diode chip. The light source for ranging according to 1 or 2. 一対のリードと、これらのリードの一方の面側に、出射面を前記リードとは反対方向に向けて配置され、前記一対のリードに接続された発光ダイオードチップと、前記発光ダイオードチップの配置部をモールドし、且つ前記発光ダイオードチップの出射面に対向する面に前記発光ダイオードチップの出射面からの出射光をその広がり角を小さくして出射する凸レンズ部が形成されたモールド体と、前記モールド体の前記凸レンズ部以外の部分において、凸レンズ部のレンズ軸に対して直交する方向に前記出射面側を凸とした角錐形状または円錐形状で前記発光ダイオードチップ部分を除く前記モールド体を断面する断面形状を有して設けられ、前記発光ダイオードチップが発する光のうち、この発光ダイオードチップの周面から前記出射面とは反対方向の前記一対のリード上に向かって出射した漏れ光を遮る非反射性の遮光膜とを備えた発光ダイオードと、
前記発光ダイオードの出射側に配置され、前記発光ダイオードから前記モールド体の凸レンズ部により広がり角が小さくなる方向に屈折されて出射した光を平行光に補正して出射する投射レンズと、
前記発光ダイオードの側方に配置され、前記投射レンズから出射し、測距対象物により反射された戻り光を受光してその信号を出力する光センサとを備えたことを特徴とする測距装置。 A pair of leads, a light emitting diode chip connected to the pair of leads, the light emitting diode chip disposed on one surface side of these leads with the emission surface facing away from the leads, and the arrangement portion of the light emitting diode chip And a mold body in which a convex lens portion is formed on the surface facing the light emission surface of the light emitting diode chip, and the light emitted from the light emission surface of the light emitting diode chip is emitted with a reduced divergence angle, and the mold A cross-section of the mold body excluding the light emitting diode chip portion in a pyramid shape or a cone shape with the exit surface side convex in a direction orthogonal to the lens axis of the convex lens portion in a portion other than the convex lens portion of the body Of the light emitted from the light-emitting diode chip, the light-emitting diode chip is provided with a shape from the peripheral surface of the light-emitting diode chip and the emission surface. A light emitting diode that includes a non-reflective light-shielding film for shielding the leakage light emitted toward the opposite direction of the pair of leads,
A projection lens that is disposed on the light emission side of the light emitting diode, corrects the light emitted from the light emitting diode by the convex lens portion of the mold body and is refracted in a direction in which the divergence angle is reduced, and emits the parallel light;
A distance measuring device, comprising: a light sensor disposed on a side of the light emitting diode, receiving a return light emitted from the projection lens and reflected by a distance measuring object, and outputting the signal. . 光センサは、投射レンズからの光の出射方向に対して交差する方向に配列した複数の光電変換素子を備え、前記投射レンズから出射して測距対象物により反射され、前記投射レンズから前記測距対象物までの距離に対応した角度で前記光センサに向かって戻った光を、前記複数の光電変換素子のうちの前記戻り光の入射点の光電変換素子により受光してその信号を出力することを特徴とする請求項４に記載の測距装置。 The optical sensor includes a plurality of photoelectric conversion elements arranged in a direction intersecting with an emission direction of light from the projection lens, is emitted from the projection lens, is reflected by a distance measuring object, and is measured from the projection lens. Light returning toward the optical sensor at an angle corresponding to the distance to the distance object is received by the photoelectric conversion element at the incident point of the return light among the plurality of photoelectric conversion elements, and the signal is output. The distance measuring device according to claim 4 . 遮光膜は、前記一対のリードと交差する部分にそれぞれリード通し孔を設け、前記一対のリードは、当該リード通し孔に挿通して配置されることを特徴とする請求項４又は５に記載の測距装置。 Shielding film, said a pair of leads cross leading respectively to the portion through hole, the pair of leads, according to claim 4 or 5, characterized in that it is arranged by inserting to the lead through hole Distance measuring device. 発光ダイオードの遮光膜は、その発光ダイオードチップ側の部分を前記発光ダイオードチップの出射面のうち、前記発光ダイオードチップの発光部の周囲部分に対応する領域に重ねて形成されていることを特徴とする請求項４から６に何れか記載の測距装置。 The light-shielding film of the light-emitting diode is formed such that a portion on the light-emitting diode chip side is overlapped with a region corresponding to a peripheral portion of the light-emitting portion of the light-emitting diode chip, on the emission surface of the light-emitting diode chip. The distance measuring device according to any one of claims 4 to 6 .
JP2009235300A 2009-10-09 2009-10-09 Ranging light source and ranging device using the same Expired - Fee Related JP5278276B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2009235300A JP5278276B2 (en) 2009-10-09 2009-10-09 Ranging light source and ranging device using the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009235300A JP5278276B2 (en) 2009-10-09 2009-10-09 Ranging light source and ranging device using the same

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP2004006840A Division JP4466083B2 (en) 2004-01-14 2004-01-14 Ranging light source and ranging device

Publications (2)

Publication Number Publication Date
JP2010010712A JP2010010712A (en) 2010-01-14
JP5278276B2 true JP5278276B2 (en) 2013-09-04

Family

ID=41590755

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009235300A Expired - Fee Related JP5278276B2 (en) 2009-10-09 2009-10-09 Ranging light source and ranging device using the same

Country Status (1)

Country Link
JP (1) JP5278276B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023079934A1 (en) * 2021-11-05 2023-05-11 ソニーセミコンダクタソリューションズ株式会社 Light-emitting device and distance measurement device

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07288343A (en) * 1994-02-28 1995-10-31 Rohm Co Ltd Light emitting diode lamp, and matrix indicator using the same
JP2001311619A (en) * 2000-05-01 2001-11-09 Asahi Optical Co Ltd Apparatus and method for measuring distance
JP2003008070A (en) * 2001-06-22 2003-01-10 Toyoda Gosei Co Ltd Light emitting diode
JP2003046138A (en) * 2001-08-01 2003-02-14 Sharp Corp Led lamp and method of manufacturing the same

Also Published As

Publication number Publication date
JP2010010712A (en) 2010-01-14

Similar Documents

Publication Publication Date Title
JP5178393B2 (en) Optical distance measuring sensor and electronic device
JP2008051764A (en) Range finding sensor, and electronic device having sensor mounted
JP5198434B2 (en) Optical encoder
JP2008028025A (en) Reflecting sensor
JP2007081354A (en) Optical module
JP6552052B2 (en) Toner adhesion amount sensor
JP4466083B2 (en) Ranging light source and ranging device
CN111142314B (en) Optical-mechanical structure with multiple light sources
US7589317B2 (en) Optical encoder having lens integrally molded with housing
US10648839B2 (en) Photoelectric encoder
JP5278276B2 (en) Ranging light source and ranging device using the same
JP5452245B2 (en) Lightwave distance measuring device
JP7093275B2 (en) Toner adhesion sensor
JP6639750B1 (en) Encoder
JP2012220353A (en) Gas component detection apparatus
JP2005251795A (en) Light source equipped with light emitting diode, and distance measuring equipment using the same
JP3139724U (en) Improved optical detection package module
JP2007327822A (en) Optical encoder and electronic device using the same
JP4999596B2 (en) Reflective photo sensor
JP2014142293A (en) Distance measuring device
JP2011044125A (en) Optical device
JP2013201226A (en) Light-emitting device
JP7102058B2 (en) Photoelectric encoder
JP2010032421A (en) Non reflective tool
TW201319515A (en) Digital movement measuring device

Legal Events

Date Code Title Description
A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20091106

A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20091106

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20091119

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20121030

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20121116

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20130423

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20130506

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

Ref document number: 5278276

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

LAPS Cancellation because of no payment of annual fees