JPS6218029B2 - - Google Patents
Info
- Publication number
- JPS6218029B2 JPS6218029B2 JP55109819A JP10981980A JPS6218029B2 JP S6218029 B2 JPS6218029 B2 JP S6218029B2 JP 55109819 A JP55109819 A JP 55109819A JP 10981980 A JP10981980 A JP 10981980A JP S6218029 B2 JPS6218029 B2 JP S6218029B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light emitting
- section
- light receiving
- output
- 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
Links
- 238000001514 detection method Methods 0.000 claims description 9
- 241000287181 Sturnus vulgaris Species 0.000 claims 1
- 230000003287 optical effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/04—Systems determining the presence of a target
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Geophysics And Detection Of Objects (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Description
【発明の詳細な説明】
本発明は光線を用いて物体の存在を検知する光
電式物体検知方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a photoelectric object detection method that uses light beams to detect the presence of an object.
一般の反射型光電式物体検知器は、検知器より
光線を発射し、それが物体に当り反射してくる反
射光を受光増幅して物体を検知している。 A typical reflective photoelectric object detector detects an object by emitting a light beam from the detector, receiving and amplifying the reflected light that hits an object.
しかしながら、このような物体検知器において
は、反射してくる光の量は、検知物体の色や表面
の丸み、形、つやなどによつて大いに異なり、物
体検知の精度に問題があつた。 However, in such object detectors, the amount of reflected light varies greatly depending on the color, roundness, shape, gloss of the surface, etc. of the object to be detected, which poses a problem in the accuracy of object detection.
本発明は以上の点に鑑み、このような問題を解
決すべくなされた光電式物体検知方式を提供する
もので、検知器に複数の発光部と１個の受光部を
設け、その受光部で受ける光線が物体が存在しな
いために来る反射光であるか、物体に当つて反射
してくる光線であるかを制御統合して正確に物体
の検知を行うようにしたものであり、受光部は１
個、発光部は複数であるから、発光部の発光時間
を順次発光とし、それに同期して受光部の受光出
力を発光部に相当した出力として取出し、正確な
物体の存在を検知する能力を持たせるようにした
ものである。 In view of the above points, the present invention provides a photoelectric object detection method designed to solve such problems.The present invention provides a photoelectric object detection method in which a detector is provided with a plurality of light emitting parts and one light receiving part, and the light receiving part It is designed to accurately detect objects by integrating control to determine whether the received light is reflected light that comes from the absence of an object or light that hits and is reflected by an object. 1
Since there are multiple light emitting parts, the light emission time of the light emitting parts is sequentially emitted, and in synchronization with that, the light receiving output of the light receiving part is extracted as an output corresponding to the light emitting part, so that it has the ability to accurately detect the presence of an object. It was designed to allow
以下、図面に基づき本発明の実施例を詳細に説
明する。 Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
第１図は本発明による光電式物体検知方式の一
実施例を示す構成図である。図において、１は大
地、２は検知器全体を示し、この検知器２には第
１の発光部３および第２の発光部４と１個の受光
部５が設けられている。そして、第１の発光部３
は発光光芒６を大地１のある面Ｐに投射し、第２
の発光部４は発光光芒７を上記面Ｐより検知器２
に近い面Ｒに投射するように構成され、また、受
光部５は光学視野８を持ち、面Ｐを凝視するよう
に構成されている。９は検知される被検知物体、
１０は第１の発光部３の発光光芒６と受光部５の
光学視野８との交叉領域を示し、１１は第２の発
光部４の発光光芒７と受光部５の光学視野８との
交叉領域を示す。１２は軽トラツクなどの被検知
物体である。 FIG. 1 is a block diagram showing an embodiment of the photoelectric object detection method according to the present invention. In the figure, 1 indicates the ground, and 2 indicates the entire detector. The detector 2 is provided with a first light emitting section 3, a second light emitting section 4, and one light receiving section 5. Then, the first light emitting section 3
projects the luminous beam 6 onto a certain surface P of the earth 1, and
The light emitting unit 4 directs the light emitting beam 7 to the detector 2 from the surface P.
The light receiving section 5 has an optical field of view 8 and is configured to gaze at the surface P. 9 is the object to be detected;
Reference numeral 10 indicates the intersection area between the light emission beam 6 of the first light emitting section 3 and the optical field of view 8 of the light receiving section 5, and 11 indicates the intersection area between the light emission beam 7 of the second light emitting section 4 and the optical field of view 8 of the light receiving section 5. Indicates the area. 12 is an object to be detected, such as a light truck.
つぎにこの第１図に示す実施例の動作を説明す
る。まず、第２の発光部４から発光せず、第１の
発光部３のみ発光しているときを考えると、第１
の発光部３から発する変調光が面Ｐに当り、散乱
反射するが、その反射の一部を受光部５の光学視
野８が捕捉するので、この上記散乱反射があると
き受光部５はこれを受けて出力し、この出力のあ
つたとき“物体なし”と判定する。そして、検知
される被検知物体９が図の二点鎖線にて示すよう
に配置されると、第１の受光部３からの変調光は
遮断されるために受光部５の出力なし、よつて
“物体あり”と判定する。 Next, the operation of the embodiment shown in FIG. 1 will be explained. First, considering the case where only the first light emitting part 3 is emitting light without the second light emitting part 4, the first light emitting part 4 is not emitting light.
The modulated light emitted from the light emitting section 3 hits the surface P and is scattered and reflected, but a part of the reflection is captured by the optical field of view 8 of the light receiving section 5. Therefore, when this scattered reflection occurs, the light receiving section 5 When this output is received, it is determined that there is no object. When the detected object 9 to be detected is arranged as shown by the two-dot chain line in the figure, the modulated light from the first light receiving section 3 is blocked, so there is no output from the light receiving section 5, and thus there is no output. It is determined that there is an object.
つぎに、第１の発光部３からの発光はないとき
を考えると、第２の発光部４から発する変調光は
面Ｒに投射され、受光部５の光学視野８は面Ｐを
視ているので、物体のないときは、第２の発光部
４の発光光芒７と受光部５の光学視野８とが斜線
で示す交叉領域１１と交叉しても物体がないから
反射はなく、受光部５の出力はない。したがつ
て、この状態では受光部５の出力は０（零）であ
り、“物体なし”と判定する。そして、もし、図
の被検知物体９の如き物体が到来したならば、交
叉領域１１の一部である面Ｓからの反射光が到来
して受光部５は出力し、この出力ありのとき“物
体あり”と判定する。 Next, considering the case where there is no light emitted from the first light emitting section 3, the modulated light emitted from the second light emitting section 4 is projected onto the surface R, and the optical field 8 of the light receiving section 5 is viewing the surface P. Therefore, when there is no object, even if the light emitting beam 7 of the second light emitting section 4 and the optical field of view 8 of the light receiving section 5 cross the intersection area 11 shown by diagonal lines, there is no reflection because there is no object, and the light receiving section 5 There is no output. Therefore, in this state, the output of the light receiving section 5 is 0 (zero), and it is determined that there is no object. If an object such as the detected object 9 in the figure arrives, reflected light from the surface S that is a part of the intersection area 11 arrives and the light receiving section 5 outputs, and when this output is present, " It is determined that there is an object.
つまり、第１の発光部３と受光部５の関係と、
第２の発光部４と受光部５の関係は、反射光の有
無に関しては逆である。何故にこのような二重構
成にするかといえば、第２の発光部４のないとき
に、一点鎖線で示す１２のような被検知物体、例
えば荷台の低い軽トラツクの床面などの物体が到
来した場合、第１の発光部３の発光光芒６を遮え
ぎつているのにかかわらず、面Ｕでその発光光芒
６の光線を反射し受光部５に入光すると、反射あ
りで“物体なし”と誤判定する。そこで、第２の
発光部４の発光光芒７の光線は面Ｖで受光部５に
反射光が入光される。このときは、反射光あり
で、“物体あり”と判定する。このような原理に
基いてどのような物体でも検知できる訳である。 In other words, the relationship between the first light emitting section 3 and the light receiving section 5,
The relationship between the second light emitting section 4 and the light receiving section 5 is reversed with respect to the presence or absence of reflected light. The reason for such a double configuration is that when the second light emitting section 4 is not present, an object to be detected such as 12 shown by a dashed dotted line, such as the floor of a light truck with a low loading platform, can be detected. When a light beam arrives at the light receiving section 5, the surface U reflects the light beam from the light emitting beam 6, even though it is blocking the light emitting beam 6 of the first light emitting section 3. erroneously determined as “None”. Therefore, the reflected light of the light emitting beam 7 of the second light emitting section 4 enters the light receiving section 5 at the surface V. At this time, there is reflected light and it is determined that there is an object. Based on this principle, any object can be detected.
しかしながら、常時、第１および第２の発光部
３および４を動作させておき、それを受光部５か
ら受けておるのでは判定ができないことは当然で
あるから、第１の発光部３のみが発光するときは
受光部５の出力があるときに“物体なし”と判定
する機能を備え、第２の発光部４のみが発光する
ときは、受光部５の出力があるとき“物体あり”
と判定する機能を備えるように制御する必要があ
る。 However, it is natural that judgment cannot be made if the first and second light emitting sections 3 and 4 are always operated and receiving the light from the light receiving section 5, so only the first light emitting section 3 is activated. When emitting light, it has a function to determine that there is no object when there is an output from the light receiving section 5, and when only the second light emitting section 4 emits light, when there is an output from the light receiving section 5, it is determined that there is an object.
It is necessary to control the system so that it has a function to determine that.
第２図はこの機能を有する制御手段を説明する
ためのブロツク図で、第１図と同一部分には同一
符号を付して説明を省略する。第２図において、
２１は電源変調部、２２および２３はそれぞれ電
源変調部２１の出力および受光部５の出力を入力
とする第１および第２のゲート切替部、２４はゲ
ート切替部２３の出力側に接続された出力判定
部、２５は第１および第２のゲート切替部２２，
２３をそれぞれ制御する時限装置部である。 FIG. 2 is a block diagram for explaining a control means having this function, and the same parts as in FIG. 1 are given the same reference numerals and the explanation thereof will be omitted. In Figure 2,
21 is a power modulation section, 22 and 23 are first and second gate switching sections each receiving the output of the power modulation section 21 and the output of the light receiving section 5, and 24 is connected to the output side of the gate switching section 23. The output determination section 25 is the first and second gate switching section 22,
23, respectively.
つぎにこの第２図に示す制御手段の動作を説明
する。今、時限装置部２５が第１および第２のゲ
ート切替部２２と２３にａ側にゲートを閉じるよ
うに命令すると、電源変調部２１によつて変調さ
れた電源は第１の発光部３を励振して発光させ
る。これと同時に受光部５の出力もａ側にゲート
を閉じるから、受光部５の出力は出力判定部２４
によつて受光部５が受光しているとき“物体な
し”と判定し、受光していないとき、すなわち出
力のないとき“物体あり”と判定する。 Next, the operation of the control means shown in FIG. 2 will be explained. Now, when the timer section 25 commands the first and second gate switching sections 22 and 23 to close the gates to the a side, the power modulated by the power modulation section 21 will cause the first light emitting section 3 to close. Excite it to emit light. At the same time, the output of the light receiving section 5 also closes the gate to the a side, so the output of the light receiving section 5 is determined by the output determining section 24.
When the light receiving unit 5 is receiving light, it is determined that there is no object, and when it is not receiving light, that is, there is no output, it is determined that there is an object.
また、時限装置部２５が第１および第２のゲー
ト切替部２２と２３にｂ側にゲートを閉じるよう
に命令すると、電源変調部２１によつて変調され
た電源は第２の発光部４を励振して発光させる。
これと同時に受光部５の出力もｂ側に閉じられる
ので、受光部５の出力は出力判定部２４によつて
出力ありの“物体あり”と判定し、出力のないと
きに“物体なし”と判定する。 Further, when the timer section 25 instructs the first and second gate switching sections 22 and 23 to close the gates on the b side, the power modulated by the power modulation section 21 causes the second light emitting section 4 to close. Excite it to emit light.
At the same time, the output of the light receiving section 5 is also closed to side b, so the output of the light receiving section 5 is determined by the output determination section 24 as "object present" with output, and as "no object" when there is no output. judge.
このように、簡単な発光部を２個とし、この第
１および第２の２つの発光部３，４の発光を時分
割で行うことにより、発光素子の長寿命化、瞬間
光出力の増大が得られ、かつ安価になり、また、
複雑で高増幅度を要求される受光部を１個のみで
使用できるから、簡単で低価格の検知器が実現で
き、さらに、時限装置部２５の切替タイミング、
電源変調部２１の変調光の高速化などからかなり
高速の物体の移動時でも正確な物体検知を行うこ
とができる。 In this way, by using two simple light emitting sections and performing the light emission of the first and second light emitting sections 3 and 4 in a time-sharing manner, the life of the light emitting element can be extended and the instantaneous light output can be increased. can be obtained and inexpensively, and
Since only one light receiving section, which is complex and requires high amplification, can be used, a simple and low-cost detector can be realized. Furthermore, the switching timing of the timer section 25,
By increasing the speed of the modulated light of the power modulation section 21, accurate object detection can be performed even when the object is moving at a fairly high speed.
以上説明したように、本発明によれば、第１お
よび第２の発光部の発光を時分割で行うことによ
り発光素子の長寿命化および瞬間光出力の増大を
得ることができ、かつ安価になり、また、複雑で
高増幅度を要求される受光部を１個のみで代用で
きるから簡単で低価格の検知器を実現することが
でき、さらに、時限装置部の切替タイミングおよ
び電源変調部の変調光の高速化能からかなり高速
の物体の移動時でも正確に物体検知ができるの
で、実用上の効果は極めて大である。 As explained above, according to the present invention, by time-sharing the light emission of the first and second light emitting parts, it is possible to prolong the life of the light emitting element and increase the instantaneous light output, and at low cost. In addition, since the complex light receiving section that requires high amplification can be replaced with just one, a simple and low-cost detector can be realized.Furthermore, the switching timing of the timer section and the power modulation section Because of the ability to increase the speed of modulated light, it is possible to accurately detect objects even when they are moving at fairly high speeds, so the practical effect is extremely large.
第１図は本発明による光電式物体検知方式の一
実施例を示す構成図、第２図は本発明の説明に供
する制御手段のブロツク図である。
３，４……発光部、５……受光部、６，７……
発光光芒、８……光学視野、９……被検知物体、
１０……発光光芒６と光学視野８との交叉領域、
１１……発光光芒７と光学視野８との交叉領域、
１２……被検知物体、２１……電源変調部、２
２，２３……ゲート切替部、２４……出力判定
部、２５……時限装置部。
FIG. 1 is a block diagram showing an embodiment of a photoelectric object detection system according to the present invention, and FIG. 2 is a block diagram of a control means for explaining the present invention. 3, 4... Light emitting section, 5... Light receiving section, 6, 7...
Luminous beam, 8... Optical field of view, 9... Object to be detected,
10... Intersection area between the light emitting beam 6 and the optical field of view 8,
11... Intersection area between the light emitting beam 7 and the optical field of view 8,
12...Detected object, 21...Power modulation section, 2
2, 23...Gate switching unit, 24...Output determination unit, 25...Timer unit.
Claims (1)
方式において、複数の発光部と１個の受光部を設
け、前記受光部の視野が固定反射面を凝視するよ
うに定め、前記複数の発光部の第１発光部の光芒
が前記受光部が凝視する固定反射面と略同一面を
照射するようになし、前記複数の発光部の第２発
光部の光芒は前記固定反射面以外を照射するよう
にしかつ受光部視野と空間において交錯するよう
に配置し、前記第１および第２の発光部を切替発
光せしめると共に、この切替発光に同期して受光
部の出力を切替え、この受光部の出力の有無によ
つて物体の有無を検知するようにしたことを特徴
とする光電式物体検知方式。1. In a photoelectric object detection method that detects an object using a light beam, a plurality of light emitting parts and one light receiving part are provided, the field of view of the light receiving part is set to stare at a fixed reflective surface, and the plurality of light emitting parts The beam of light of the first light emitting section of the plurality of light emitting sections is configured to irradiate substantially the same surface as the fixed reflective surface that the light receiving section stares at, and the beam of light of the second light emitting section of the plurality of light emitting sections is configured to irradiate a surface other than the fixed reflective surface. The first and second light emitting parts are arranged so as to intersect with the field of view of the light receiving part in space, and the first and second light emitting parts are switched to emit light, and the output of the light receiving part is switched in synchronization with this switching light emission, and the output of the light receiving part is changed. A photoelectric object detection method characterized by detecting the presence or absence of an object based on its presence or absence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10981980A JPS5734476A (en) | 1980-08-12 | 1980-08-12 | Photoelectric type body sensing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10981980A JPS5734476A (en) | 1980-08-12 | 1980-08-12 | Photoelectric type body sensing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5734476A JPS5734476A (en) | 1982-02-24 |
| JPS6218029B2 true JPS6218029B2 (en) | 1987-04-21 |
Family
ID=14520005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10981980A Granted JPS5734476A (en) | 1980-08-12 | 1980-08-12 | Photoelectric type body sensing system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5734476A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0448781Y2 (en) * | 1986-07-30 | 1992-11-17 | ||
| JPH0448776Y2 (en) * | 1986-09-25 | 1992-11-17 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5866879A (en) * | 1981-10-16 | 1983-04-21 | Takenaka Eng Kogyo Kk | Reflection type photoelectric switch |
| JPS6076676A (en) * | 1983-10-03 | 1985-05-01 | Sogo Keibi Hoshiyou Kk | Invasion detecting apparatus |
| JPS6192785U (en) * | 1984-11-22 | 1986-06-16 | ||
| US4659922A (en) * | 1985-02-19 | 1987-04-21 | Eaton Corporation | Optical sensor device for detecting the presence of an object |
-
1980
- 1980-08-12 JP JP10981980A patent/JPS5734476A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0448781Y2 (en) * | 1986-07-30 | 1992-11-17 | ||
| JPH0448776Y2 (en) * | 1986-09-25 | 1992-11-17 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5734476A (en) | 1982-02-24 |
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