CN1234020C - Multiple-optical axis photoelectronic sensor - Google Patents
Multiple-optical axis photoelectronic sensor Download PDFInfo
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- CN1234020C CN1234020C CN 02143973 CN02143973A CN1234020C CN 1234020 C CN1234020 C CN 1234020C CN 02143973 CN02143973 CN 02143973 CN 02143973 A CN02143973 A CN 02143973A CN 1234020 C CN1234020 C CN 1234020C
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- interference light
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Abstract
The present invention relates to a multi-optical-axis photoelectric sensor for detecting the intruding of the punch device and so on, which can prevent the mutual interference between the multi-optical-axis photoelectric sensors without installing synchronizing line between the multi-optical-axis photoelectric sensors. An interference light is detected based on an interference light detection timing signal Si provided just in front of a light shielding detection timing signal Sr. When the interference light is continuously detected in the detection timing of the interference light of the same optical axis, the pulse position of the light shielding detection timing signal is displaced and it avoids overlapping with the pulse of the interference light on the time base and prevents the mutual interference by shortening the time of the pause period(tb) to the time of the pause period(ta).
Description
Technical field
For example the present invention relates to be used for the multi-beam photoelectric sensor of intrusion detection etc., particularly prevent the multi-beam photoelectric sensor of the maloperation that the mutual interference of other multi-beam photoelectric sensor causes decompressor.
Background technology
As this multi-beam photoelectric sensor, the multi-beam photoelectric sensor that is disclosed in No. 2911369 communique of (Japan) patent is for example arranged.This multi-beam photoelectric sensor will be furnished with the light projector of a plurality of light-projecting components and dispose light-receiving device arranged opposite, each light-projecting component and the photo detector formation optical axis of a plurality of photo detectors corresponding to each light-projecting component.The light-projecting component that disposes in the light projector regularly repeats the light projector scan operation of light projector successively with the light projector of regulation, according to detecting the shading of optical axis from the light signal that is subjected to that constitutes the photo detector of optical axis with each light-projecting component, the object that detects in surveyed area is invaded.
But, have many multi-beam photoelectric sensors are set in case in wideer zone the situation of the intrusion of inspected object, as shown in Figure 6, have multi-beam photoelectric sensor is configured to situation near state.Under such situation, when for example some optical axises of the multi-beam photoelectric sensor above being arranged at 61 carry out shading and detect, incide the photo detector of the multi-beam photoelectric sensor 61 of top as interference light from the light of multi-beam photoelectric sensor 62 light projectors that are arranged at the below.So the optical axis of the multi-beam photoelectric sensor 61 of top is by shading, thus because of from the light of the multi-beam photoelectric sensor 62 of below as interference light incident, can produce the maloperation of the shading state that can not detect optical axis.
In order to prevent such maloperation, need the scan operation of control light projector, so that the light projector between close multi-beam photoelectric sensor is regularly not overlapping.Therefore, the following method of synchronization of general employing: in two multi-beam photoelectric sensors 61,62, a conduct master side, another is as subordinate side, from principal direction subordinate side output synchronizing signal, in subordinate side, carry out the light projector scan operation with the phase place different with master side.Like this, when the light-projecting component in a multi-beam photoelectric sensor 61 is lighted, in another multi-beam photoelectric sensor 62, be not subjected to the detection of light signal, so have the advantage that can prevent maloperation.
But, if adopt the above-mentioned method of synchronization, then exist its wiring operation loaded down with trivial details, the required how such problem of the number of working processes number is set.
In addition, in this multi-beam photoelectric sensor, in general, the timing of not lighting with any one light-projecting component detects whether occur being subjected to light signal on the photo detector, and judges that the situation of presence of interference interference of light light detection operation is in the majority.Like this, if consistent with the detection timing of interference light by accident in the method for synchronization just in case except synchronously, then cause carry out the light projector scan operation in originally with one-period, periodically detect interference light, existence can be judged as the situation of sensor abnormality.
Summary of the invention
The present invention is based on the invention that above-mentioned situation is finished, and its purpose is to provide a kind of multi-beam photoelectric sensor, even do not carry out the line synchro wiring between multi-beam photoelectric sensor, also can prevent the mutual interference between multi-beam photoelectric sensor.
In multi-beam photoelectric sensor of the present invention, any one light-projecting component do not light during, if be subjected to light signal from photo detector output, then shading and interference light detection part are according to the incident of this input interference light, then, it is regularly different that shading and interference light detection part make the beginning of light projector scan operation of light projector control assembly.Therefore, owing to regularly stagger with other the light projector of multi-beam photoelectric sensor, so can prevent mutual interference.
Multi-beam photoelectric sensor involved in the present invention comprises: a plurality of light-projecting components, a plurality of photo detector, shading and interference light detection part and light projector control assembly.Wherein a plurality of photo detectors are by in the face of each light-projecting component this a plurality of photo detectors being set, so that constitute a plurality of optical axises.Described shading and interference light detection part are made of analog switch, comparing unit, sensitive side and shift register, wherein when connecting multi-beam photoelectric sensor, sensitive side is input to shift register with the timing signal that shading detects timing signal and interference light detection, and make the analog switch conducting, will be taken in the comparing unit from the light signal that is subjected to of each photo detector.Described shading and interference light detection part by opposed with it and with the regularly consistent light signal that is subjected to that detects from described each photo detector of lighting of the light-projecting component that forms described optical axis, thereby detect the shading state in the described optical axis, when it is not lighted at any one described light-projecting component, detect the existence of interference light according to the light signal that is subjected to from described photo detector.Described light projector control assembly, cycle in accordance with regulations repeats light projector scan operation that described light-projecting component group is lighted successively in predetermined timing, wherein said light projector control assembly is when described shading and interference light detection part detect interference light, and the beginning that the makes described light projector scan operation regularly beginning of the described light projector scan operation when not detecting the existing of described interference light is regularly different.
Wherein said light projector control assembly regularly staggers the beginning of described light projector scan operation and is equivalent to lighting the time of half at interval of described light-projecting component when described shading and interference light detection part detect interference light.
Description of drawings
Fig. 1 is the oblique view of the structure of expression multi-beam photoelectric sensor.
Fig. 2 is the circuit diagram of the electrical structure of expression multi-beam photoelectric sensor.
Fig. 3 is the sequential chart of the operation of expression multi-beam photoelectric sensor.
Fig. 4 is the process flow diagram of shading detection routine.
Fig. 5 is the process flow diagram of interference light detection routine.
Fig. 6 is the structure oblique view of existing multi-beam photoelectric sensor.
Embodiment
Below by Fig. 1 to Fig. 5 one embodiment of the invention are described.
The multi-beam photoelectric sensor 1 of present embodiment is in light projector 2 and light-receiving device 3 configuration state is constituted as shown in Figure 1, for example, has the optical axis L of 4 passages.In light projector 2, face on the face of light-receiving device 3, in each passage, 1 (counting 4) light emitting diode 21a～21d (hereinafter referred to as LED21a～21d) be configured to row on above-below direction, (is called PD31a～31d) be configured on the identical above-below direction in the face of forming right photodiode 31a～31d with LED21～21d on the face of light projector 2 in light-receiving device 3.Therefore, LED21a～21d is equivalent to light-projecting component, PD31a～31d and light-projecting component form to and be equivalent to constitute the photo detector of optical axis.In addition, in Fig. 1 below with multi-beam photoelectric sensor 10 near configuration.
Fig. 2 represents the electrical structure of the multi-beam photoelectric sensor 1 of present embodiment.In light projector 2, be furnished with and be used to driving circuit 22a～22d that LED21a～21d is lighted,, then drive current is supplied with LED21a～21d if each driving circuit 22a～22d accepts the signal from "AND" circuit 23a～23d.Output signal from shift register 24 and light projector side CPU25 is imported into "AND" circuit 23a～23d, and behind the signal of input from shift register 24 and light projector side CPU25, signal is output to driving circuit 23a～23d.The sensitive side CPU35 that light projector side CPU25 is furnished with from light-receiving device 3 described later accepts light projector timing signal St, and St outputs to shift register 24 and "AND" circuit 23a～23d with this light projector timing signal.
This light projector timing signal St is the pulse signal of specified period, is generated by CPU35, is used to determine lighting regularly of LED21a～21d.Interior 4 pulses equally spaced produce to separate time ta in 1 cycle of light projector timing signal St (length T), after the 4th pulse, the interval tb of specified length are set.Thus, in each period T, repeat light projector scan operation that 4 LED21a～21d are lighted from top to bottom successively.Therefore, "AND" circuit 23a～23d, shift register 24, light projector side CPU25 and sensitive side CPU35 constitute the light projector control assembly that the light-projecting component group is lighted successively with predetermined timing.
On the other hand, in light-receiving device 3, be furnished with respectively the photo-detector amplifier 32a～32d that amplified with the magnification of stipulating by light signal from PD31a～31d.Being subjected to light signal to focus on the shared signal wire and being taken in the comparing unit 34 from photo-detector amplifier 32a～32d output by analog switch 33a～33d.If rise to the reference value of setting the comparing unit 34 from the light signal that is subjected to of this photo-detector amplifier 32a～32d output, then go into light detecting signal Sd and be imported into sensitive side CPU35, can detect the situation of light inlet.
Sensitive side CPU35 will be consistent with above-mentioned light projector timing signal St cycle and phase place shading detect timing signal Sr and detect timing signal Sr cycle unanimity with this shading and the leading interference light of phase place detects timing signal Si and outputs to shift register 36.Accepted shading from sensitive side CPU35 and detected shift register 36 that timing signal Sr and interference light detect timing signal Si will to be used to make each the analog switch 33a～33d that is connected to this shift register 36 be that the gating control signal of conducting state outputs to analog switch 33a successively to analog switch 33d, the analog switch 33a～33d that has accepted the gating control signal will output to comparing unit 34 from the light signal that is subjected to of each PD31a～31d.Therefore, when the output shading detects timing signal Sr, each LED21a～21d is in illuminating state, so according to having or not the light detecting signal Sd that goes into to carry out the shading detection from comparing unit 34, and when the output interference light detects timing signal Si, LED21a～21d is in non-illuminating state, so according to light detecting signal Sd is carried out interference light by sensitive side CPU35 the detection of going into that has or not from comparing unit 34.
Below, the operation of sensitive side CPU35 is described with reference to Fig. 3～Fig. 5.At first, if connect the power supply of multi-beam photoelectric sensor 1, then as shown in Figure 2, sensitive side CPU35 outputs to light projector side CPU25 with light projector timing signal St, repeats the light projector scan operation in period T.In addition, shading is detected timing signal Sr to sensitive side CPU35 and interference light detection timing signal Si outputs to shift register 36 and makes analog switch 33a～33d be followed successively by conducting state, to be taken in the comparing unit 34 from the light signal that is subjected to of each PD31a～31d, according to having or not into light detecting signal Sd, sensitive side CPU35 carries out the shading detection and interference light detects.
＜shading detects 〉
In the sequential chart of Fig. 3, when the level of shading detection timing signal Sr is high level (H), carry out shading detection routine shown in Figure 4.For example, under the situation of the object that does not cover optical axis,, output to sensitive side CPU35 so in the shading of all PD31a～31d detects, will go into light detecting signal Sd from comparing unit 34 owing to incide on each PD31a～31d from the light of LED21a～21d.Therefore, sensitive side CPU35 is judged as all PD31a～31d for going into light state (being "No" in step S41).
Here, for example under the situation that the optical axis that is made of PD31a is covered by object, even the analog switch 33 that PD31a connects is a conducting state, do not go into light detecting signal Sd, so be judged as non-ly to go into light state (being "Yes" among the step S41) and carry out the counting (step S42) that shading detects from comparing unit 34 output yet.For PD31b～31d, carry out incident from the light of LDE21b～21d, in step S41 so be "No".Then, during next cycle, the shading that repeats PD31a～31d detects.When the shading of PD31a detects, do not export into light detecting signal Sd from comparing unit 34, so be judged as the non-light state (in step 41, being "Yes") of going into.So, the counting that shading detects is added (step S42), be judged as for the optical axis that constitutes by PD31a and doublely be judged as shading state (among the step S43 for "Yes"), so to output circuit 37 output signals (step S44), the processing when carrying out the shading state.Have again, finish (be "Yes") in step S45, then, repeat aforesaid operations once more the count resets of shading detection if detect for the shading of the PD31d of last level.Thus, as can be known analog switch 33a～33d, comparing unit 34, sensitive side CPU35 and shift register 36 as the function of the light-blocking member of the shading state that detects each optical axis.
＜interference light detects 〉
On the other hand, when the level of interference light detection timing signal Si is H, carry out interference light detection routine shown in Figure 5.Usually, the shading that the shading of multi-beam photoelectric sensor 1 detects timing signal Sr and another multi-beam photoelectric sensor 10 detects the asynchronous and phase shifting of timing signal, thus in the shading regularly of multi-beam photoelectric sensor 1 not incident from the light of the light-projecting component of multi-beam photoelectric sensor 10 (be equivalent among Fig. 3 during A).Therefore, in interference light detects regularly, even from each PD31a～31d to be subjected to light signal to pass through analog switch 33a～33d effective successively, do not go into light detecting signal Sd from comparing unit 34 outputs yet, so all be judged as the non-light state (being "No" in step S51) of going into for any one PD31a～31d, the result is judged as not incident of interference light.
On the contrary, each multi-beam photoelectric sensor 1,10 works alone respectively, for example, detects regularly next shading timing near multi-beam photoelectric sensor 1 by the shading that postpones multi-beam photoelectric sensor 10, as a result, regularly overlapping with the interference light detection of multi-beam photoelectric sensor 1 on time shaft.So when multi-beam photoelectric sensor 1 detected regularly for interference light, incident was from the light of the light-projecting component of multi-beam photoelectric sensor 10 (be equivalent among Fig. 3 during B).At first, be judged as the optical axis PD31a (in step S51, being "Yes") that interference light incides epimere, light inlet detected count (step S52).Then, equally also be judged as for next optical axis PD31b and carry out light incident (in step S51 for "Yes"), carry out the counting (step S52) that light inlet detects.After, equally also be judged as for PD31c, 31d and carry out light incident (in step S51 for "Yes", step S52).Then, carry out once more the interference light of PD31a～31d is detected, when finishing interference light for the PD31 of back segment and detect (be "Yes"), carry out the judgement of interference light incident according to the counting of interference light detection for each optical axis in step S53.As a result, because any one optical axis all is counted twice, so be judged as incident interference light (in step S54, being "Yes").So, be shortened half of time ta between the adjacent pulse that shading detects timing signal Sr until producing interval tb before next interference light detects the pulse of timing signal Si, become interval tc (step S55).Thus, the shading train of impulses that detects timing signal Sr is compared left to Fig. 3 to staggering with the train of impulses of shading detection timing signal (among the figure epimere) under not shortening interval tb situation.From aforesaid operations as can be known, analog switch 33a～33d, comparing unit 34, sensitive side CPU35 and shift register 36 be equivalent to any one light-projecting component do not light during, detect shading and interference light detection part that interference light exists according to the light signal that is subjected to from photo detector, and "AND" circuit 23a～23d, shift register 24, light projector side CPU25 and sensitive side CPU35 constitute the light projector control assembly when detecting interference light, the beginning that makes described light projector scan operation is regularly regularly different with the beginning that does not detect the described light projector scan operation of prime number interference light when existing.
Like this, multi-beam photoelectric sensor l according to present embodiment, in detecting interference light,, then interval tb can be shortened to half of the time ta that is equivalent between adjacent pulse that shading detects timing signal Sr if carry out the double incident of light for same optical axis.Its result, so long as the periodic interference light that penetrates from other multi-beam photoelectric sensors 10, the timing that then later shading detects regularly and interference light penetrates becomes the position relation of spaced furthest on time shaft, can avoid the incident of interference light, prevents mutual interference reliably.In addition, other multi-beam photoelectric sensors 10 work alone, so do not need to be used to obtain the line synchro synchronous with other multi-beam photoelectric sensors 10, setting that can simplified wiring.
＜other embodiment 〉
The invention is not restricted to the embodiment by above-mentioned explanation and description of drawings, for example Yi Xia embodiment is also contained in the technical scope of the present invention, and, except that following described, in the scope that does not break away from main spirit, can carry out various changes and implement.
(1) in the above-described embodiments, being that condition shortens the change interval, but can be that condition shortens change interval tb also for example by 1 time or the continuous interference light that detects more than 3 times for the double detection interference light of same optical axis.
(2) in above-mentioned example, be not limited to shorten change interval tb, also can increase change, in addition,, also can obtain same effect even the change shading detects the interpulse interval ta of timing signal.
(3) in above-mentioned example, detecting under the situation of interference light, interval tb is shortened to the interval tc that detects the adjacent interpulse half the time ta of timing signal Sr with shading, but be not limited to this, can be the above interval of tc, also can be the following interval of tc.Key is, as long as change interval in interference light detects regularly, makes and can avoid the incident of interference light just passable.
Claims (2)
1. multi-beam photoelectric sensor comprises:
A plurality of light-projecting components;
A plurality of photo detectors are in the face of each light-projecting component is provided with this a plurality of photo detectors, so that constitute a plurality of optical axises;
Shading and interference light detection part, by analog switch (33a-33d), comparing unit (34), sensitive side CPU (35) and shift register (36) constitute, wherein when connecting multi-beam photoelectric sensor, sensitive side CPU (35) is input to the timing signal that shading detects timing signal and interference light detection shift register (36) and makes analog switch (33a-33d) conducting, will be taken in the comparing unit (34) from the light signal that is subjected to of each photo detector;
Wherein said shading and interference light detection part by opposed with it and with the regularly consistent light signal that is subjected to that detects from described each photo detector of lighting of the light-projecting component that forms described optical axis, thereby detect the shading state in the described optical axis, when it is not lighted at any one described light-projecting component, detect the existence of interference light according to the light signal that is subjected to from described photo detector;
The light projector control assembly, cycle in accordance with regulations repeats light projector scan operation that described light-projecting component group is lighted successively in predetermined timing, wherein said light projector control assembly is when described shading and interference light detection part detect interference light, and the beginning that the makes described light projector scan operation regularly beginning of the described light projector scan operation when not detecting the existing of described interference light is regularly different.
2. multi-beam photoelectric sensor comprises:
A plurality of light-projecting components;
A plurality of photo detectors are in the face of each light-projecting component is provided with this a plurality of photo detectors, so that constitute a plurality of optical axises;
Shading and interference light detection part, it is by analog switch (33a-33d), comparing unit (34), sensitive side CPU (35) and shift register (36) constitute, wherein when connecting multi-beam photoelectric sensor, sensitive side CPU (35) is input to the timing signal that shading detects timing signal and interference light detection shift register (36) and makes analog switch (33a-33d) conducting, will be taken in the comparing unit (34) from the light signal that is subjected to of each photo detector;
Wherein said shading and interference light detection part by opposed with it and with the regularly consistent light signal that is subjected to that detects from described each photo detector of lighting of the light-projecting component that forms described optical axis, thereby detect the shading state in the described optical axis, when it is not lighted at any one described light-projecting component, detect the existence of interference light according to the light signal that is subjected to from described photo detector;
The light projector control assembly, cycle in accordance with regulations repeats light projector scan operation that described light-projecting component group is lighted successively in predetermined timing, wherein said light projector control assembly regularly staggers the beginning of described light projector scan operation and is equivalent to lighting the time of half at interval of described light-projecting component when described shading and interference light detection part detect interference light.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001331504 | 2001-10-29 | ||
| JP2001331504A JP3860013B2 (en) | 2001-10-29 | 2001-10-29 | Multi-axis photoelectric sensor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1417562A CN1417562A (en) | 2003-05-14 |
| CN1234020C true CN1234020C (en) | 2005-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02143973 Expired - Fee Related CN1234020C (en) | 2001-10-29 | 2002-09-29 | Multiple-optical axis photoelectronic sensor |
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| Country | Link |
|---|---|
| JP (1) | JP3860013B2 (en) |
| CN (1) | CN1234020C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104919896B (en) * | 2012-12-18 | 2017-10-13 | 飞利浦灯具控股公司 | Control the impulse ejection from sensor |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4009862B2 (en) * | 2003-09-30 | 2007-11-21 | オムロン株式会社 | Multi-axis photoelectric sensor |
| JP5182064B2 (en) * | 2008-12-19 | 2013-04-10 | オムロン株式会社 | Multi-axis photoelectric sensor |
| JP5970230B2 (en) * | 2012-05-08 | 2016-08-17 | アツミ電氣株式会社 | Ranging type security sensor |
| JP6291993B2 (en) | 2014-04-18 | 2018-03-14 | オムロン株式会社 | Multi-axis photoelectric sensor |
| CN106569286B (en) * | 2016-10-27 | 2019-04-16 | 合肥欣奕华智能机器有限公司 | A kind of photoelectric detection system |
| JP6878931B2 (en) | 2017-02-08 | 2021-06-02 | オムロン株式会社 | Sensor control device and sensor system |
| CN109581895B (en) * | 2018-11-23 | 2020-08-25 | 华自科技股份有限公司 | Test tool control method and device, electronic equipment and storage medium |
-
2001
- 2001-10-29 JP JP2001331504A patent/JP3860013B2/en not_active Expired - Fee Related
-
2002
- 2002-09-29 CN CN 02143973 patent/CN1234020C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104919896B (en) * | 2012-12-18 | 2017-10-13 | 飞利浦灯具控股公司 | Control the impulse ejection from sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2003133933A (en) | 2003-05-09 |
| CN1417562A (en) | 2003-05-14 |
| JP3860013B2 (en) | 2006-12-20 |
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