JPH0816612B2 - Optical distance measuring device - Google Patents

Optical distance measuring device

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Publication number
JPH0816612B2
JPH0816612B2 JP3219452A JP21945291A JPH0816612B2 JP H0816612 B2 JPH0816612 B2 JP H0816612B2 JP 3219452 A JP3219452 A JP 3219452A JP 21945291 A JP21945291 A JP 21945291A JP H0816612 B2 JPH0816612 B2 JP H0816612B2
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light
object
distance measuring
distance
light emitting
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JPH0560551A (en
Inventor
征夫 大豆生田
義之 寺田
智広 山口
清光 石川
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スタンレー電気株式会社
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Publication of JPH0816612B2 publication Critical patent/JPH0816612B2/en
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Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【産業上の利用分野】この発明は、例えば自動車用の障害物検知装置の距離センサとして使用される距離計測装置、特に光源からの光を物体に照射し、該物体からの反射光を検出して物体までの距離を計測する光学式距離計測装置に関するものである。 BACKGROUND OF THE INVENTION This invention, for example, a distance measuring device which is used as a distance sensor of the obstacle detection device for a motor vehicle, in particular irradiated with the light from the light source to the object, and detecting reflected light from said object it relates to an optical type distance measuring device for measuring a distance to an object Te.

【0002】 [0002]

【従来の技術】図3は物体からの反射光を検出して該物体までの距離を計測する従来の光学式距離計測装置の要部を示す図である。 BACKGROUND ART FIG. 3 is a diagram showing a main portion of a conventional optical distance measuring apparatus for measuring a distance to said object by detecting the reflected light from the object. 図中、P1,P2,P3は点光源用の発光部、L1,L2,L3,L4は線光源となる発光部で、これらは共にLED等の発光素子から構成され、 In the figure, P1, P2, P3 are light emitting portion for point source, in L1, L2, L3, L4 light emitting portion serving as a linear light source, they are both composed of light-emitting element such as an LED,
交互に横に配置されている。 It is arranged laterally alternately. R1,R2,R3はそれぞれ点光源となる発光部P1,P2,P3に対応して配置された受光部である。 R1, R2, R3 is a light receiving portion which are disposed corresponding to the light-emitting unit P1, P2, P3, which respectively become point sources.

【0003】上記のような構成を持つ距離計測装置においては、性質の異なる二つの光源、すなわち発光部P [0003] In the distance measuring apparatus having the above structure, two different light sources properties, i.e. light-emitting portion P
1,P2,P3の点光源と発光部L1〜L4の線光源を時系列的に発光させ、その光を検知した物体に照射する。 1, P2, and P3 light source and line light source of the light emitting portion L1~L4 point chronologically emit light, it irradiates the object detected the light. そして、その物体からの反射光を受光部R1,R Then, the light receiving portion R1 of the light reflected from the object, R
2,R3の受光素子で受光し、それらの二つの光源の反射光のレベルの比を演算して物体までの距離を計測する。 2, received by the light receiving element R3, by calculating the ratio of the level of the reflected light of those two light sources for measuring the distance to an object.

【0004】例えば、発光部P1の点の延長線上にある物体を検知したい時は、先ず発光部L1〜L4を全て点灯させてから発光部P1を点灯させ、その2種類の反射光を受光部R1で受光し、それらの反射光のレベルの比から物体までの距離を計測する。 [0004] For example, if you want to detect an object in an extension of the point of the light emitting portion P1, first of all the light-emitting portion L1~L4 is turned to turn on the light-emitting portion P1 from the light-receiving unit that two reflected light received by R1, to measure the distance to the object from the level ratio of their reflected light. 発光部P2,P3の点の延長線上にある物体についても、上記と同様にして距離を計測することができる。 For objects that are an extension of the point of the light emitting portion P2, P3 also can measure the distance in the same manner as described above.

【0005】 [0005]

【発明が解決しようとする課題】しかしながら、上記のような従来の光学式距離計測装置にあっては、点光源と線光源の二つの光源をそれぞれ別の発光素子で構成しているため、発光素子の数量が増加し、高価なものになるという問題点があった。 [SUMMARY OF THE INVENTION However, since in the conventional optical distance measuring apparatus as described above, constitute two light sources of the point light source and line light source in separate light-emitting number of elements is increased, a problem that becomes expensive.

【0006】この発明は、上記のような問題点に着目してなされたもので、発光素子の数量を少なくすることができ、低コストで、また発光素子の駆動回路にパワーの大きなものが不要な光学式距離計測装置を提供することを目的としている。 [0006] The present invention has been made in view of the problems described above, it is possible to reduce the quantity of the light emitting element, at low cost, also large unnecessary power to the drive circuit of the light emitting element and its object is to provide a an optical type distance measuring device.

【0007】 [0007]

【課題を解決するための手段】この発明の光学式距離計測装置は、光源からの光を物体に照射し、該物体からの反射光を検出して物体までの距離を計測する光学式距離計測装置において、各ブロック毎に分割した1種類の発 SUMMARY OF THE INVENTION The optical distance measuring apparatus of the present invention, the light from the light source irradiating the object, the optical distance measurement for measuring a distance to an object by detecting reflected light from said object in the device, one of the origination divided for each block
光素子による複数の発光部と、これらの発光部に対応して配置した各受光部と、任意の単独の発光部を点灯させた時の反射光のレベルと他の一つ以上の発光部を同時に点灯させた時の反射光のレベルとに基づいて物体までの距離を演算する演算回路とを備え、該演算回路は各反射 A plurality of light emitting portions by the optical device, and the light receiving portions arranged in correspondence with these light-emitting portion, one or more light emitting portion level and the other of the reflected light when to turn on the light-emitting portion of any single and an arithmetic circuit for calculating the distance to the object based on the level of the reflected light when lit simultaneously, the arithmetic circuit each reflection
光のレベルの比を演算し、その演算結果をあらかじめ用 Calculating a level ratio of the light, use a result of the operation in advance
意したデータテーブルを参照して距離データに変換する Converting the distance data by referring to the meaning data table
ようにしたものである。 It is obtained by way.

【0008】また、上記各発光部は、同一の周波数で変調された変調光を物体に照射し、かつ時系列で点灯を制御するようにしたものである。 [0008] The upper SL each light emitting unit is to light modulated at the same frequency is irradiated to the object, and was set to control the lighting in time series.

【0009】 [0009]

【作用】この発明の光学式距離計測装置においては、各発光ブロック毎の複数の発光部が設けられ、これに対応して複数の受光部が設けられている。 [Action] In the optical distance measuring apparatus of the present invention, a plurality of light emitting units of each light emitting block is provided, a plurality of light receiving portions corresponding thereto are provided. そして、計測時には所定の発光部が単独で点灯し、また他の発光部は一つ以上同時に点灯する。 A predetermined light emitting portion during the measurement lights alone, the other light emitting portion is turned one more time. 演算回路は、それらの単独の発光部と他の発光部からの反射光のレベルを検出し、その値に基づいて物体までの距離を演算する。 Arithmetic circuit detects the level of reflected light from their single light emitting portion and the other light emitting unit, calculates the distance to the object based on the value.

【0010】 [0010]

【実施例】図1はこの発明の一実施例による光学式距離計測装置の概略を示す構成図である。 Embodiment] FIG. 1 is a configuration diagram showing an outline of an optical distance measuring apparatus according to an embodiment of the present invention. これは、例えば自動車の障害物検知装置として使用されるもので、図において、P1,P2,P3,P4は各発光ブロック毎に分割した複数の発光部で、それぞれ少なくとも1個以上のLEDで構成されている。 This is for example intended to be used as an automotive obstacle detection device, in FIG., P1, P2, P3, P4 in the plurality of light emitting portions divided for each light-emitting block, composed of at least one or more LED, respectively It is. R1,R2,R3,R4はこれらの発光部P1〜P4に対応して配置した複数の受光部で、各々光電変換を行う受光素子により構成されている。 R1, R2, with R3, R4 plurality of light receiving portions arranged in correspondence with these light-emitting portions P1 to P4, and is configured by the light receiving elements, each performing photoelectric conversion.

【0011】また、図1中、1は任意の単独の発光部を点灯させた時の反射光のレベルと他の一つ以上の発光部を同時に点灯させた時の反射光のレベルとに基づいて物体までの距離を演算する演算回路で、具体的には各反射光のレベルの比を演算し、その演算結果をあらかじめ用意したデータテーブル2を参照して距離データに変換する。 [0011] In Figure 1, 1 is based on the level of the reflected light when simultaneously lit any single of the reflected light when the light emitting portion is lit levels and other one or more light emitting portion Te in arithmetic circuit for calculating the distance to an object, specifically by calculating the ratio of the level of each reflected light, and converts the reference data table 2 which is prepared the operation result in advance the distance data.

【0012】なお、各発光部P1〜P4は、不図示の制御回路によりそれぞれ同一の周波数で変調された変調光を物体に照射し、また時系列で点灯が制御されるようになっている。 [0012] Each light emitting unit P1~P4 the modulated light modulated at the same frequency, respectively by a control circuit (not shown) is irradiated on the object, also when the lighting in series are controlled.

【0013】次に、図2のタイミングチャートを用いて上記構成の距離計測装置の動作について説明する。 [0013] Next, the operation of the distance measuring apparatus having the above structure with reference to the timing chart of FIG.

【0014】例えば、受光部R1の延長線上の点の障害物を検知する時は、先ず対応する発光部P1のみを点光源として単独で点灯させ、次に残りの発光部P2,P [0014] For example, when detecting an obstacle point on the extension line of the light receiving portion R1, first alone is lit only the corresponding light-emitting unit P1 as a point light source, then the remaining light emitting portion P2, P
3,P4を線光源として同時に点灯させる。 3, P4 simultaneously turns on the as a line light source. また、受光部R2の点の障害物を検知する時は、発光部P2のみを点灯させ、次に他の発光部P1,P3,P4を点灯させる。 Also, when detecting an obstacle in terms of the light receiving portion R2 is only the light emitting portion P2 is turned, then allowed to light the other light emitting portion P1, P3, P4.

【0015】同様に、受光部R3の点の障害物を検知する時は発光部P3を単独で点灯させてから残りの発光部P1,P2,P4を同時に点灯させ、受光部R4の点の障害物を検知する時は発光部Pを単独で点灯させてから他の発光部P1,P2,P3を点灯させ、以下同様に発光部の点灯制御を行う。 [0015] Similarly, simultaneously turns on the rest of the light emitting portion P1, P2, P4 from the light the light emitting portion P3 alone when detecting an obstacle in terms of the light receiving portion R3, fault point of the light receiving portion R4 things lights the other light emitting portion P1, P2, P3 were allowed to turn on the light-emitting portion P alone when detecting a, performs lighting control of the same light emitting portion below.

【0016】演算回路1は、上記単独の発光ブロックの点光源の反射光のレベルと残りの発光ブロックの線光源の反射光のレベルとの比を演算し、その演算結果をデータテーブル2を用いて距離データに変換する。 The arithmetic circuit 1 calculates the ratio between the level of the reflected light of the line light source levels and the remaining light-emitting blocks of the reflected light of the light source of the above single light-emitting block, using the data table 2 the result of the calculation to convert Te to the distance data. これにより、各々の障害物までの距離が計測される。 Thus, the distance to each of the obstacle is measured.

【0017】このように、距離による照度特性が異なる二つの光源からの光を物体に照射し、その反射光を受光部で光電変換したレベルの比を求めることにより物体までの距離を計測することができる。 [0017] in this manner, the distance by light from two light sources illumination characteristics differ by irradiating the object to measure the distance to the object by obtaining the ratio of the levels obtained by photoelectrically converting the reflected light by the light receiving portion can.

【0018】その際、演算回路1は図2に示すように、 [0018] At that time, the arithmetic circuit 1, as shown in FIG. 2,
T1〜T4の期間にそれぞれ受光部R1〜R4のデータに対する演算を行い、順次障害物までの距離を計測する。 Each performs operations on data of the light receiving portion R1~R4 the period T1-T4, measuring the distance to the sequential obstacle.

【0019】ここで、各発光部P1〜P4は点光源用と線光源用の両方に兼用となるので、二つの光源に別の発光素子を用いる必要がなく、発光素子の数量を少なくすることができ、低コストにすることができる。 [0019] Here, since the light-emitting portions P1~P4 is also used both for the line light source for a point light source, it is not necessary to use a separate light-emitting elements into two light sources, reducing the quantity of the light emitting element it can be can be, to a low cost. また、従来では線光源用の発光素子の駆動回路(ドライバ)は点光源用のものよりパワーの大きなものが必要であったが、本実施例ではパワーの大きな駆動回路(LEDドライバ)は不要となる。 The drive circuit of a light emitting element for the line light source in the conventional (driver) but was required larger power than for a point source, a large driving circuit of the power in the present embodiment (LED driver) unnecessary Become.

【0020】なお、上記実施例では特性の異なる二つの光源を点光源と線光源としたが、これに代えて点光源と面光源、あるいは線光源と面光源としても良い。 [0020] In the above embodiment has been with two different point light source and line light source of the light source characteristics, the point light source and the surface light source in place of this or may be a line light source and the surface light source.

【0021】 [0021]

【発明の効果】以上のように、この発明によれば、各ブロック毎に分割した複数の発光部と、これらの発光部に対応して配置した各受光部とを備え、計測時には所定の発光部を単独で点灯させ、次に他の一つ以上の発光部を同時に点灯させて物体からの反射光を検出するようにしたので、二つの光源で別々の発光素子を用いる必要がなく、発光素子の数量を少なくすることができ、低コストになるとともに、発光素子のパワーの大きな駆動回路が不要になるという効果がある。 As is evident from the foregoing description, according to the present invention, a plurality of light emitting portions divided for each block, and a respective light receiving portions arranged in correspondence with these light-emitting portion, a predetermined light emission at the time of measurement parts alone is lit, then since to detect the reflected light from by turning the other one or more light emitting portions at the same time the object, there is no need to use a separate light-emitting elements in the two light sources, light emitting it is possible to reduce the number of elements, it becomes a low cost, there is an effect that a large driving circuit of the power of the light emitting element is not required.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】 この発明の一実施例を示す構成図 Figure 1 is a configuration diagram showing one embodiment of the present invention

【図2】 図1の装置の動作を示すタイミングチャート Figure 2 is a timing chart showing the operation of the apparatus of FIG. 1

【図3】 従来例を示す構成図 Figure 3 is a configuration diagram showing a conventional example

【符号の説明】 DESCRIPTION OF SYMBOLS

P1,P2,P3,P4 発光部 R1,R2,R3,R4 受光部 1 演算回路 2 データテーブル P1, P2, P3, P4 emitting portion R1, R2, R3, R4 light receiving unit 1 arithmetic circuit 2 data table

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭56−147008(JP,A) 特開 昭62−46207(JP,A) 特開 昭64−23429(JP,A) 特開 平3−107709(JP,A) 特開 昭63−309883(JP,A) 特開 昭63−309882(JP,A) 特開 平2−227689(JP,A) ────────────────────────────────────────────────── ─── of the front page continued (56) reference Patent Sho 56-147008 (JP, a) JP Akira 62-46207 (JP, a) JP Akira 64-23429 (JP, a) JP flat 3- 107709 (JP, A) JP Akira 63-309883 (JP, A) JP Akira 63-309882 (JP, A) JP flat 2-227689 (JP, A)

Claims (2)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 光源からの光を物体に照射し、該物体からの反射光を検出して物体までの距離を計測する光学式距離計測装置において、各ブロック毎に分割した1種類 1. A light from a light source irradiating the object, the optical distance measuring device for measuring a distance to an object by detecting reflected light from said object, one divided for each block
    の発光素子による複数の発光部と、これらの発光部に対応して配置した各受光部と、任意の単独の発光部を点灯させた時の反射光のレベルと他の一つ以上の発光部を同時に点灯させた時の反射光のレベルとに基づいて物体までの距離を演算する演算回路とを備え、該演算回路は各 Of a plurality of light emitting portions by the light emitting element, these and the light receiving portions arranged corresponding to the light emitting unit, one or more light emitting portion level and the other of the reflected light when to turn on the light-emitting portion of any single simultaneously based on the level of the reflected light when lit and an arithmetic circuit for calculating the distance to an object, the arithmetic circuit each
    反射光のレベルの比を演算し、その演算結果をあらかじ Calculating a level ratio of the reflected light, beforehand the operation result
    め用意したデータテーブルを参照して距離データに変換 It converted to distance data by referring to the data table because prepared
    することを特徴とする光学式距離計測装置。 Optical distance measuring apparatus characterized by.
  2. 【請求項2】 各発光部は、同一の周波数で変調された変調光を物体に照射し、かつ時系列で点灯が制御されることを特徴とする請求項1記載の光学式距離計測装置。 Wherein each light emitting unit, the same modulated light modulated at a frequency irradiating the object, and time series lighting is characterized in that it is controlled according to claim 1 Symbol placement of the optical distance measuring device .
JP3219452A 1991-08-30 1991-08-30 Optical distance measuring device Expired - Lifetime JPH0816612B2 (en)

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JP3219452A JPH0816612B2 (en) 1991-08-30 1991-08-30 Optical distance measuring device

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JPH0560551A JPH0560551A (en) 1993-03-09
JPH0816612B2 true JPH0816612B2 (en) 1996-02-21

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US9348800B2 (en) 2007-08-22 2016-05-24 9224-5489 Quebec Inc. Method of managing arrays of documents
US8984417B2 (en) 2008-09-12 2015-03-17 9224-5489 Quebec Inc. Method of associating attributes with documents
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