JPH04121132U - Photoelectric detection device - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a photoelectric detection device that sequentially operates a plurality of photoelectric switches. [Structure] The photoelectric switch 31 includes a transmission light receiving element 37 that receives an optical pulse signal S1, a pulse generation circuit 34 that generates a timing signal, and a transmission projection that projects an optical pulse signal S2 in synchronization with the timing signal. The light receiving element 37 and the light emitting element 38 are arranged on a straight line L1 parallel to the arrangement direction of the photoelectric switches 31 and 32 with the light receiving element 37 and the light emitting element 38 facing away from each other. It is characterized in that the light receiving axis and the light emitting axis of the light emitting element 38 are set to coincide with the straight line L1. [Effect] Reliably prevents mutual interference between photoelectric switches.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention detects the presence or absence of an object by projecting light and detecting the presence or absence of reflected light. The present invention relates to a photoelectric detection device in which a plurality of photoelectric switches for determination are sequentially arranged.

0002

[Conventional technology]

Photoelectric switches are used as a means of detecting the presence or absence of objects moving on conveyor lines, etc. It is known that This projects light onto the path of an object and The presence or absence of an object is determined by detecting the presence or absence of reflected light. It takes In photoelectric switches, projection light is used to reduce power consumption and prevent mutual interference. The light is emitted intermittently in a pulsed manner.

0003 FIG. 58 is an exploded perspective view showing an example of this type of conventional photoelectric switch. The photoelectric switch is a so-called optical fiber type switch, and mainly consists of main unit 1 and detection switch. It consists of two exits. The main body 1 has a case 3 and a power supply built into the case 3. A circuit board 5 to which wiring 4 such as a cable or an output cable is connected, and this circuit board 5, the detection light emitting element 6, the detection light receiving element 7, and the upper part of the case 3 are covered. , the top plate 10 to which the indicator light 8 and adjustment knob 9 are attached, and the side of the case 3. and has insertion holes 11 and 12 facing the light emitting element 6 and the light receiving element 7. It consists of 13. On the other hand, the detection unit 2 is arranged facing the detected object 14. One end is connected to the detection head 15, and the other end is connected to the insertion hole 11, a pair of optical fibers 16 connected to the light emitting element 6 and the light receiving element 7 via 12; It has become. In conventional photoelectric switches like this, a timing signal of a predetermined period is used. When the sensing light is intermittently output from the light emitting element 6 in response to the The light is guided through the fiber 16 and projected from the detection head 15 onto the object to be detected 14 . child When the light reflected by the object to be detected 14 enters the detection head 15, this reflected light becomes a light The light is guided through the fiber 16 and received by the light receiving element 7, and as a result of this light reception, the circuit board 5 outputs a detection signal via wiring 4. On the other hand, when there is no detected object 14, Since the emitted light is not received by the light receiving element 7, a detection signal is output from the circuit board 5. I don't feel strong.

0004 FIG. 59 is an exploded perspective view showing another example of a conventional photoelectric switch. The switch is a so-called lens type switch, and the optical fiber shown in FIG. The main difference is the detection part compared to the type one, and the output from the detection light emitting element 17 is The pulsed light is projected onto the object to be detected 14 through the projection lens 18, and the object to be detected 14 is The reflected light is received by the detection light receiving element 20 via the light receiving lens 19. It has become.

[0005] Usually, there is not only one photoelectric switch for detecting the presence or absence of an object, but also other photoelectric switches. Multiple photoelectric switches are used for this purpose. For example, on a conveyor line A photoelectric switch that emits light from the side and a photoelectric switch that emits light from below. H, multiple photoelectric switches are installed in one place, such as a photoelectric switch that emits light from above. In addition to detecting the presence or absence of an object, it can also simultaneously detect the presence or absence of a label affixed to the object. (Hereinafter, this projected light will be referred to as sensing light.) However, it is difficult to arrange multiple photoelectric switches in close proximity or close together in one place like this. , and each photoelectric switch emits light continuously, each photoelectric switch emits light from other photoelectric switches other than itself. There is a possibility that the sensing light projected by the switch may also be received. Add this to the above However, with photoelectric switches, the light emission timing does not overlap with other photoelectric switches. In addition to emitting light intermittently, the light emitted by itself and reflected light from other photoelectric switches are Means is provided for distinguishing between the light (interference light) received by the light emitted by

[0006] FIG. 60 is a block diagram showing a conventional photoelectric switch, in which 21 is a periodic pulse 22 is a light emitter, 23 is a light receiver, 24 is a gate circuit, 25 is an integration circuit, 26 is a determination circuit. For example, pulse generation circuit 21, gate circuit 24, integral The circuit 25 and the determination circuit 26 are provided on the circuit board 5, and the light projecting section 22 is provided on the circuit board 5. It consists of the light projecting element 6 and the like, and the light receiving section 23 consists of the light receiving element 7 and the like.

[0007] In FIG. 60, the periodic pulse generation circuit 21 always emits a pulse P1 of a constant period. The light emitting unit 22 is driven by this pulse P1 and has the same frequency as this pulse P1. During the period, sensing light is projected in a pulsed manner at a duty ratio. This sensing light When reflected by a body (not shown), the reflected light is received by the light receiving section 23, and the pulse P 2 is output. This pulse P2 is generated by reflected light from the light emitting unit 22 of its own. If the pulse is obtained by If it is obtained by receiving the sensing light from the switch, it is tied to pulse P1. The timings do not match. Therefore, the output pulse P2 of the light receiving section 23 is gated with respect to the pulse P1. The pulse P2 is supplied to the gate circuit 24 as a pulse P2, and the pulse P2 is supplied to the gate circuit 24 as a Extract only the pulse. The output pulse of the gate circuit 24 is converted into a pulse P by the integrating circuit 25. 1, and when the integral value is greater than or equal to the preset threshold, the judgment is made. The constant circuit 26 determines that an object is present.

[0008] The sensing light projected onto an object from the light projection unit 22 is reflected by the object, but the sensing light is reflected by the object. The reflected light is scattered, and a part of the reflected light is received by the light receiving section 23. For this reason, the acceptance The amount of light received by the light section 23 is small. Therefore, it is necessary to create pulse P2 from a small amount of light. However, if the presence or absence of an object is determined for each pulse P2, the The accuracy of detecting the presence or absence of is low. For this purpose, an integrating circuit 25 is provided. , the pulse extracted by the gate circuit 24 is integrated, and judgment is made according to the magnitude of the integrated value. is being carried out. This integrating circuit 25 may be an analog integrating circuit, but , usually a pulse counter is used to determine the timing of pulse P1 from the gate circuit 24. The determination circuit 26 determines the count value when, for example, eight pulses are supplied consecutively. It is determined that there is an object.

[0009] In such a photoelectric switch, the output pulse P1 of the periodic pulse generation circuit 21 If the duty ratio of is made sufficiently small compared to the period, the probability of mutual interference will be low. It also reduces power consumption. However, each photoelectric switch is completely independent, Furthermore, the period of light projection of each photoelectric switch is usually almost equal. For this reason, 2 In some cases, the light emission timings of two or more photoelectric switches overlap. This way In such a case, in FIG. 60, even though there is no object, other photoelectric switches As a result of the light emission, a pulse whose timing coincides with the pulse P1 is emitted from the light receiving section 23. The pulse P2 is output. Such a pulse P2 cannot be removed by the gate circuit 24. , Therefore, an error will occur in determining the presence or absence of an object.

0010 An example of a technique for preventing such mutual interference is disclosed in Japanese Patent Publication No. 60-51043. has been done. This is because the interference identification circuit 27 is connected to the gate circuit 24 as shown in FIG. Identify whether the output pulse of the output pulse is due to interference light or not. When the pulse generation circuit 21a is controlled by the phase shift circuit 28, the pulse generation circuit 21a is controlled by the phase shift circuit 28. The phase of pulse P1 is advanced or delayed.

[0011] In addition, in Japanese Patent Application Laid-open No. 61-138192, a pulse is generated by receiving interference light. Extract the pulse signal and generate a pulse with the same frequency and different phase as this pulse signal. Drives the light emitter so that it emits light at the same frequency as the interference light but with a different phase. The technology has been disclosed.

0012 Furthermore, in Japanese Patent Application Laid-Open No. 63-263917, When a pulse is obtained from the light receiving section, the emission period is sequentially shifted from the reference period, A technique that returns the emission period to the original standard period when a predetermined number of such pulses are obtained. technique has been disclosed. According to this, other photoelectric switches with approximately the same light emitting period as the self When the light emission timing of the switch matches the self-emission timing, the light is emitted from the receiver. Since pulses that match the optical timing are obtained, the self-emitting period changes sequentially. go. On the other hand, the light emission periods of the other photoelectric switches do not change. Therefore, self The light emitting timing of oneself is different from the light emitting timing of other photoelectric switches, and this Pulses from the light receiving section due to light from other photoelectric switches are removed by the gate circuit. However, the light receiving section receives the light emitted by itself, and this causes the light receiving section to The output pulse matches the self-emission timing. The number of such pulses is Once the number is obtained, the self-emitting period returns to the original reference period. However, at this time Due to the above operation, the own light emission timing may deviate from the previous light emission timing. Therefore, the light emitting timing will be different from that of other photoelectric switches. Ru.

[0013]

[Problem that the idea aims to solve]

All of the above-mentioned conventional technologies are able to adapt to other photoelectric switches by shifting the light emission timing. The aim is to prevent mutual interference with switches and photoelectric switches installed in one location. This is quite effective when the number of switches is small. However, many photoelectric When installing switches in one place, these photoelectric switches must be used to eliminate mutual interference. At least this The difference in light emission timing between these photoelectric switches is slight. For this, Even if the light emitting timing of two photoelectric switches match, their light emitting If the timing is shifted, it will match the light emission timing of other photoelectric switches, Mutual interference cannot be completely prevented.

[0014] In addition, each photoelectric switch is equipped with mutual interference prevention means as described above. In the case of multiple photoelectric switches where mutual interference occurs, the light emitting timing is shifted. will be done. In this case, make sure that there is no mutual interference due to these shifts. In order to It will be very difficult to determine them.

[0015] Furthermore, the above conventional technology requires mutual interference prevention means with a complicated circuit configuration. .

[0016] The purpose of this invention is to sequentially operate multiple photoelectric switches installed at one location. The object of the present invention is to provide a photoelectric detection device that can perform the following.

[0017]

[Means to solve the problem]

In order to achieve the above object, the first means of the present invention is to provide a timing signal with a predetermined period. A detection light emitting element that intermittently projects sensing light according to the signal and the sensing light reflected by the detected object. and a detection light-receiving element that receives the reflected light, and the sensing light and the timing A photoelectric switch that determines the presence or absence of an object based on the presence or absence of received light pulses with matching signals. In a photoelectric detection device in which a plurality of photoelectric detectors are arranged close to each other or closely arranged, The switch includes a transmission light receiving element that receives a periodic optical pulse signal, and the optical pulse signal. A synchronization timing signal that synchronizes with this optical pulse signal based on the signal or the optical pulse signal. generating a delayed timing signal that is delayed by a predetermined period of time from the timing signal; A signal generation means to output to the element, and the synchronization timing signal or the delay timing. A transmitting light emitting element that projects a periodic optical pulse signal in synchronization with the signal is provided. Both of these transmitting light receiving elements and transmitting light emitting elements are moved away from each other. Place the photoelectric switch in a straight line parallel to the arrangement direction of the photoelectric switch, facing the Align the light-receiving axis of the transmission light-receiving element and the light-emitting axis of the transmission light-emitting element with the straight line. transmission from the transmitting light emitting element of the previous photoelectric switch to the next photoelectric switch. The light pulse signal is transmitted to the light receiving element for use.

[0018] Further, the second means intermittently transmits the sensing light according to a timing signal of a predetermined period. A detection light emitting element that projects a target object, and a detection light emitting element that receives reflected light from an object to be detected. a light receiving element, and receives a light pulse whose timing coincides with the sensing light. Multiple photoelectric switches that determine the presence or absence of objects based on their presence or absence are installed in close proximity or close proximity. In the photoelectric detection device arranged in the array, the periodicity of the incident light on the photoelectric switch is A reception optical refractor that refracts the optical path of the optical pulse signal, and A transmission light-receiving element that receives an optical pulse signal, and a transmission light receiving element that receives an optical pulse signal; A synchronous timing signal that synchronizes with the pulse signal or a predetermined time period from the optical pulse signal. a signal generator that generates a delayed timing signal and outputs it to the detection light emitting element; a means for generating a periodic signal in synchronization with the synchronous timing signal or the delayed timing signal. A transmitting light projecting element that projects a digital optical pulse signal, and a transmitting light projecting element that projects a refracts the optical path of the optical pulse signal and guides the optical pulse signal to the next stage photoelectric switch. The structure includes a transmission refractor.

[0019]

[Effect] In the first means of the present invention, a periodic optical pulse signal is projected onto a photoelectric switch. This photoelectric switch generates a synchronized timing signal or a delayed signal by means of signal generation means. A timing signal is generated and output to the detection light projecting element. Therefore, this detection light The element senses according to the synchronized timing signal or delayed timing signal. Light is projected intermittently, and the light reflected by the object to be detected is received by the detection light receiving element. , the object is detected depending on whether or not a light pulse whose timing coincides with the sensing light is received. Determine the presence or absence of. Further, the photoelectric switch is configured to control the synchronous terminal by means of a transmitting light emitting element. This is achieved by projecting an optical pulse signal in synchronization with a timing signal or a delayed timing signal. The optical pulse signal of It is transmitted to the transmission light receiving element of the next stage photoelectric switch with the same direction. Then, the corresponding The next-stage photoelectric switch also determines the presence or absence of an object as described above. This makes it possible to sequentially operate multiple photoelectric switches installed in one location. can.

[0020] In addition, in the second means of the present invention, a periodic optical pulse signal is projected to a photoelectric switch. Then, this photoelectric switch changes the optical path of the optical pulse signal by the receiving optical refractor. The light pulse signal is guided to a transmission light receiving element, and this transmission light receiving element The optical pulse signal is received, and as in the case of the first means described above, the sensing light is The presence or absence of an object is determined based on whether or not optical pulses are received at the same timing. Both transmit synchronized timing signals and delayed timing signals using transmitting light emitting elements. A light pulse signal is synchronously projected, and this light pulse signal is refracted by a transmitting light refractor. and is transmitted to the next stage photoelectric switch. Next, the photoelectric switch in the next stage also uses the above-mentioned method. It is designed to determine the presence or absence of an object. As a result, A plurality of photoelectric switches can be operated sequentially.

[0021]

【Example】

Hereinafter, embodiments of the photoelectric detection device of the present invention will be described based on the drawings. FIG. 1 is a perspective view showing a first embodiment of the photoelectric detection device of the present invention, and FIG. 2 is a perspective view showing the photoelectric detection device of the present invention. A perspective view showing the state in which the photoelectric switches of the detection device are arranged on a rail. FIG. 2 is a block diagram showing a photoelectric switch of the photoelectric detection device. In addition, in Figure 3, the front Components equivalent to those shown in FIG. 60 described above are given the same reference numerals. That is, 22 is a light emitting unit, 23 is a light receiving unit, 24 is a gate circuit, 25 is an integrating circuit, and 26 is a judgment unit. It is a circuit.

[0022] The photoelectric detection device shown in FIG. 1 includes a photoelectric switch 31 and a The next stage photoelectric switches 32 are arranged in sequence. And the photoelectric switch 31 As shown in FIG. 3, the basic configuration is similar to the conventional one shown in FIG. 60 described above. , light projecting section 22, light receiving section 23, gate circuit 24, integrating circuit 25, and determination circuit 2 6, and further includes a transmission light receiving section 33 that receives the periodic optical pulse signal S1. and a synchronization timing that is synchronized with the optical pulse signal S1 based on the optical pulse signal S1. delay timing delayed by a predetermined time from the switching signal or the optical pulse signal S1 A pulse generation circuit as a signal generation means that generates a signal and outputs it to the light projecting section 22. 34 and the next stage in synchronization with the synchronous timing signal or the delayed timing signal. A transmitting light projecting section 35 projects a periodic optical pulse signal S2 to the photoelectric switch 32. I am prepared.

[0023] The transmission light receiving section 33 protrudes from one side of the case 36, as shown in FIG. The transmitting light-receiving element 37 includes a transmitting light-receiving element 37, and the transmitting light projecting section 34 also includes a case 36 and other parts. It consists of a transmitting light projecting element 38 that protrudes from one side. These light receiving elements 3 7 and the light emitting element 38 are arranged in a straight line L1 parallel to the arrangement direction of the photoelectric switches 31 and 32. The light receiving elements 37 The optical axis and the light emitting axis of the light emitting element 38 are set to coincide with the straight line L1. Ru. On the other hand, the light projecting section 22 is a detection light projecting element (not shown) built in the case 36. an optical fiber 39 connected to this light emitting element, and a tip of this optical fiber 39. The light receiving section 23 also includes a detection head (not shown) provided in the case 32. A detection light-receiving element (not shown) built in and an optical fiber connected to this light-receiving element. It consists of a bar 38a and the detection head provided at the tip of the optical fiber 38a. ing. Similarly, the next stage photoelectric switch 32 also includes a transmission light receiving element 37a and It includes a transmission light projecting element 38a and the like. These photoelectric switches 31 and 32 are shown in FIG. 2, the transmitting light emitting element 38 of the photoelectric switch 31 and the transmitting light emitting element 38 of the photoelectric switch 32 The transmission light receiving elements 37a are attached to the rail 40 so as to face each other. . Note that while the light emitted from the detection light emitting element is called sensing light, it is called transmission light. The optical pulse signal projected from the transmitting light projecting element 38 will be referred to as transmitted light.

[0024] In this first embodiment, the transmitted light, that is, the periodic optical pulse signal S1 is directly transmitted. When transmitted to the photoelectric switch 31 via the line L1, this photoelectric switch 31 , the optical pulse signal S1 is received by the transmission light receiving element 37, and the pulse generating circuit 34 receives the optical pulse signal S1. A synchronization timer is synchronized with the optical pulse signal S1 based on the optical pulse signal S1. timing signal or a delay timing delayed by a predetermined time from the optical pulse signal S1 It generates a signal and outputs it to the detection light projector 22. Along with this, the detection light projecting section 2 2, sensing according to the synchronized timing signal or delayed timing signal; Light is intermittently projected through the optical fiber 39 and the detection head. this At this time, the reflected light reflected by the object to be detected is transmitted through the detection head and the optical fiber 39a. The light is received by the detection light receiving section 23, and the gate circuit 24 and the integrating circuit 25 perform a predetermined procedure. After processing, the determination circuit 26 determines whether the timing matches the sensing light. The presence or absence of an object is determined based on whether or not a light pulse is received. In addition, the transmission light projecting section 3 5 is a light pulse in synchronization with the synchronous timing signal or the delayed timing signal. The signal S2 is projected from the transmission light projecting element 38. Next, the optical pulse signal S2 is a straight line. The optical pulse signal reaches the next stage photoelectric switch 32 via the optical axis on L1. S2 is received by the transmission light receiving element 37a. Then, the next stage photoelectric switch 32 Also, the presence or absence of an object is determined as described above according to the optical pulse signal S2. There is.

[0025] In the first embodiment configured in this way, a plurality of photoelectric switches are installed in one place. 31 and 32 can be operated sequentially. In this example, two photoelectric switches are used. Although the case of a photoelectric detection device consisting of switches 31 and 32 has been illustrated, the present invention is limited to this. However, if a photoelectric detection device consisting of three or more photoelectric switches is installed in one place. However, these photoelectric switches can be activated sequentially.

[0026] 4 is a perspective view showing a second embodiment of the photoelectric detection device of the present invention, and FIG. 5 is a perspective view showing the photoelectric detection device of the present invention. FIG. 3 is an exploded perspective view showing a photoelectric switch of the detection device.

[0027] The photoelectric detection device shown in FIG. 4 includes a photoelectric switch 41 and a photoelectric switch 41. The photoelectric switches 42 of the next stage, which are screwed together, are closely arranged. For example, light The basic configuration of the power switch 41 is the same as that of the first embodiment, and is similar to that shown in FIG. 3 described above. As shown in FIG. and a pulse generation circuit 34 as a signal generation means. , and a transmission light projector 35. The transmission device provided in this embodiment As shown in FIG. 4, a light receiving window 44a fitted into this opening 44, and a circuit built into the case 43. The transmission light receiving element 46 is attached to the circuit board 45 and faces the light receiving window 44a. The transmitting light projector 34 also has an opening 47 provided on the other side of the case 43. , a light projection window 47a fitted into this opening 47, and a light projection window 47a fitted to the circuit board 45. , a transmission light projection element 48 facing a light projection window 47a. these openings 44, light receiving element 46, light emitting element 48, and aperture 47 are used for photoelectric switches 41, 42, etc. The light receiving element 46 and the light emitting element 48 are arranged on a straight line L2 parallel to the arrangement direction, and the light receiving element 46 and the light emitting element 48 are arranged on a straight line L2 parallel to the arrangement direction. The light-receiving axis of the light-receiving element 46 and the light-emitting axis of the light-emitting element 48 The optical axis is set to coincide with the straight line L2. On the other hand, the light projecting section 22 , a detection light emitting element (not shown) built into the case 43, and a detection light emitting element connected to this light emitting element. an optical fiber 49 and a detector (not shown) provided at the tip of the optical fiber 49. The light receiving unit 23 also includes a detection unit (not shown) built in the case 43. an optical fiber 49a connected to this light receiving element, and this optical fiber 49a and the detection head (not shown) provided at the tip. other light The electric switch 42 is similarly configured, and has a light receiving window and a light receiving element (not shown) on the straight line L2. A light emitting element, a light emitting element, a light emitting window 47b, and the like are arranged.

[0028] Even in this second embodiment, the periodic optical pulse signal S1 passes along the straight line L2. When the optical pulse is transmitted to the photoelectric switch 41, the optical pulse is transmitted to the photoelectric switch 41. The signal S1 is received by the transmission light receiving element 46 through the light receiving window 44, and the first embodiment is performed. Determine the presence or absence of an object using the same procedure as in the example. The transmission light projecting element 48 is The optical pulse signal S2 is synchronized with the synchronous timing signal or the delayed timing signal. The light is projected onto the transmission light receiving element of the next stage photoelectric switch 42 via the straight line L2. Communicate to. The next stage photoelectric switch 42 also responds to the optical pulse signal S2. The presence or absence of an object is determined as described above.

[0029] The second embodiment configured in this manner also has the same effect as the first embodiment described above. Obtainable. Furthermore, in this embodiment, the photoelectric switches 41 and 42 are placed closely together. Therefore, the arrangement space for these photoelectric switches 41 and 42 is reduced. be able to. Also, as described above, the photoelectric switches 41 and 42 are brought close to each other. At the same time, since the openings 44 and 47 are arranged inside the outer periphery of the case 43, the transmission The optical pulse signal etc. projected from the light projecting element 48 can be prevented from leaking to the outside. Ru. In this embodiment, the openings 44 and 47 of the case 43 include a light receiving window 44a and a light projecting window. 47a, the inside of the case 43 can be sealed to improve waterproofness and dustproofness. I can do it.

[0030] Note that in this second embodiment, an optical fiber having optical fibers 49 and 49a is used. Although the case where a fiber-type photoelectric switch is installed is shown as an example, the present invention is not limited to this. As shown in FIGS. 6 and 7, multiple lens-type photoelectric switches each having a lens 50 are installed together. Even if the photoelectric switches are connected, the photoelectric switches can be operated sequentially in the same manner. moreover In this embodiment, a light receiving window 44a and a light emitting window 47a are provided in the openings 44 and 47 of the case 43. However, the light receiving window 44a and the light emitting window 47a may be omitted if necessary. The optical pulse signals may be transmitted and received through the apertures 44 and 47. Sara In this embodiment, the openings 44 and 47 are provided inside the outer periphery of the case 43; If necessary, as shown in FIGS. It may be provided in contact with the periphery. Furthermore, in this embodiment, two photoelectric switches 4 are used. 1 and 42, the present invention is not limited to this, and the present invention is not limited to this. Even if a photoelectric detection device consisting of two or more photoelectric switches is installed in one place, this These photoelectric switches can be activated sequentially.

[0031] FIG. 10 is a perspective view showing a third embodiment of the photoelectric detection device of the present invention, and FIG. 12 is a side view showing the photoelectric switch included in the photoelectric detection device of FIG. A cross-sectional view of the photoelectric switch along line A; FIG. 13 is an enlarged cross-sectional view of part B in FIG. 12. , FIG. 14 is a diagram showing the timing relationship of signals of the photoelectric detection device of FIG. 10.

[0032] The photoelectric detection device shown in FIG. 10 includes a photoelectric switch 61 and a photoelectric switch 6 at the next stage. 2 and the next-stage photoelectric switch 63 are sequentially arranged closely together. For example, light The electric switch 62 has a basic configuration similar to that of the first embodiment, and is similar to that shown in FIG. As shown, a light projecting section 22, a light receiving section 23, a gate circuit 24, an integrating circuit 25, and A determination circuit 26, a transmission light receiving section 33, a pulse generation circuit 34 as a signal generation means, It also includes a transmission light projector 35. The transmission receiver provided in this embodiment As shown in FIG. 12, the light section 33 is configured as shown in FIG. 12, similar to the second embodiment shown in FIG. An opening 65 provided on one side of the case 64 and an opening 65 fitted into the opening 65. The light receiving window 65a is attached to the circuit board 66 built into the case 64. 5a and a transmission light-receiving element 67 facing the transmission light-receiving element 67. 4 and a light projection window 6 fitted into this opening 68. 8a, and a transmission light emitting element attached to another circuit board 69 and facing the light emitting window 68a. It consists of 70 children. These apertures 65, light receiving elements 67, light emitting elements 70, The opening 68 is arranged on a straight line L3 parallel to the arrangement direction of the photoelectric switches 61 to 63, The light-receiving element 67 and the light-emitting element 70 face in a direction away from each other, and the light-receiving element 6 The light receiving axis of 7 and the light emitting axis of the light emitting element 70 are set to coincide with the straight line L3. There is. On the other hand, the light projecting unit 22 is a detection light projecting unit (not shown) built in the case 64. element, an optical fiber 71 connected to this light emitting element, and a tip of this optical fiber 71. The light receiving section 23 is also arranged inside the case 64. A built-in detection light receiving element 73 and an optical fiber 71 connected to this light receiving element 73 a, and the detection head 72 provided at the tip of the optical fiber 71a. ing. The transmission light projecting element 70 is a sensing light projected from the detection light projecting element. It is designed to project transmitted light of a different wavelength from that of light. Note that other photoelectric switches The channels 61 and 63 are similarly constructed.

[0033] Even in this third embodiment, the periodic optical pulse signal passes through the straight line L3. When transmitted to the photoelectric switch 61, the photoelectric switch 61 receives the optical pulse signal. The presence or absence of an object is determined according to the same procedure as in the first embodiment, and the optical path is The signal S1 is projected and transmitted to the next stage photoelectric switch 62 via the straight line L3. do. Next, the next-stage photoelectric switch 62 receives the optical pulse signal S1 through a light receiving window. The light is received by the transmission light receiving element 67 via the light receiving element 65a, and the light is generated by the pulse generating circuit 34. A synchronization timing signal that synchronizes with this optical pulse signal S1 based on the pulse signal S1 Or generate a delayed timing signal delayed by a predetermined time from the optical pulse signal S1. and outputs it to the detection light projector 22. Accordingly, the light projecting section 22 Sensing from the detection light emitting element according to the timing signal or delay timing signal The scanning light 74 is intermittently projected through the optical fiber 71 and the detection head 72. child At this time, the reflected light from the object to be detected 75 is sent to the detection head 72 and the optical fiber 71a. The light is received by the light receiving element 73 via the gate circuit 24 and the integrating circuit 25. After processing in this order, the determination circuit 26 determines whether the timing matches the sensing light. The presence or absence of an object is determined based on the presence or absence of received light pulses. In addition, the transmission light emitting element The child 70 outputs an optical signal in synchronization with the synchronized timing signal or the delayed timing signal. The transmission signal S2 is transmitted to the next stage photoelectric switch 63 via the straight line L3. The signal is transmitted to the receiving light receiving element. Then, the next stage photoelectric switch 63 also receives the optical pulse signal. The presence or absence of an object is determined in accordance with the signal S2 as described above. At this time , the transmitted light (i.e., optical pulse signal) 7 through the light projection window 68b of the photoelectric switch 63. 6 is emitted.

[0034] FIG. 14 is a characteristic diagram showing the relationship between the light emission timings of the photoelectric switches 61 to 63. , in FIG. 14, A1 and A2 are detection light emitting elements of the photoelectric switch 61, respectively. , B1 and B2 are characteristic lines showing the light emitting timing of the transmitting light emitting element, Characteristic line showing the light emission timing of the detection light emitting element of the switch 62 and the transmission light emitting element 70 , C1, and C2 are detection light emitting elements and transmission light emitting elements of the next-stage photoelectric switch 63. This is a characteristic line showing the child's light projection timing.

[0035] The light emitting time period of the photoelectric switches 61 to 63 is set as shown in FIG. That is, first, the photoelectric switch 61 connects the detection light emitting element as shown by the characteristic line A1. After the sensing light is emitted during the light emitting time period indicated by arrow a, as shown by characteristic line A2. After a predetermined time, the transmitting light is projected by the transmitting light projecting element. Then, the photoelectric switch According to the transmitted light from the switch 61, as shown by the characteristic line B1, the next stage photoelectric switch 6 2, the detection light emitting element emits sensing light after a predetermined time during the light emitting time period indicated by arrow b. After the light is emitted, the transmitted light is projected by the transmitting light projecting element as shown by the characteristic line B2. Next Then, according to the transmitted light from the photoelectric switch 62, as shown by the characteristic line C1, further The next stage photoelectric switch 63 uses a detection light emitting element to emit light as indicated by arrow c after a predetermined time. After emitting the sensing light during the optical time period, the transmitting light emitting element transmits transmitted light. In this way, the light emitting time period of the photoelectric switches 61 to 63 is The sensor is set so that the detection light receiving element does not detect the light outside of its own light emission time. Even if the sing light is received, it is not determined that an object is present. And these Since the photoelectric switches 61 to 63 are arranged closely and sequentially, the photoelectric switches 61 to 63 are The transmitted light projected from the transmitting light projecting elements of channels 61 and 62 is prevented from leaking to the outside. However, if the light emitting window 68b of the next-stage photoelectric switch 63 is exposed to the outside, In this case, the transmitted light 76 is projected through the light projection window 68b. Accordingly, in Figure 14 As shown, in the time period x when the transmitted light 76 and the sensing light 75 overlap, the transmitted light 76 is reflected by the object to be detected 75 and goes around to the detection head 72, and the light receiving element 73 There are concerns that it will reach this point.

[0036] The third embodiment configured in this way also has the same effect as the first embodiment described above. Obtainable. Furthermore, the wavelength of the transmission light projected from the transmission light projecting element 70 is These wavelengths are different from the wavelength of the sensing light projected from the detection light emitting element. The transmitted light and the sensing light can be distinguished with the naked eye, and the transmitted light becomes the sensing light. Overlapping can be easily prevented. In addition, the photoelectric switches 61 to 63 are placed in close order. Since the photoelectric switches 61 to 63 are arranged in can do. In addition, in this embodiment, the openings 65 and 68 of the case 64 are provided with light receiving windows. 65a and a floodlight window 68a, the case 64 can be sealed to improve waterproof and dustproof properties. You can aim for the top.

[0037] Note that, as shown in FIG. 15, there is a gap between the detection light receiving element 73 and the optical fiber 71a. When a filter member 77 that attenuates the wavelength range of transmitted light is provided, this filter part Since the sensing light can be selectively passed through the material 77, the transmitted light is interference with the sensing light can be prevented. Similarly, as shown in FIG. 5 is provided with a light receiving window 78 made of a filter member that attenuates the wavelength range of the sensing light. In this case, the light receiving window 78 allows the transmitted light to selectively pass through. , it is possible to prevent the sensing light from interfering with the transmitted light. Furthermore, FIGS. 17 and 18 As shown in Figure 2, the double-component filter consists of a filter material that attenuates the wavelength range of the sensing light. By providing the shaped light receiving window 79 in the opening 65, the sensing light becomes transmitted light. Not only can interference be prevented, but the case 64 can be sealed to improve waterproof and dustproof properties. You can aim for the top. Furthermore, as shown in Figure 19, the wavelength range of the sensing light is By providing a case 80 formed from an attenuating filter member, the sensor It prevents the interference of beam light, improves sealing performance, and reduces the number of parts. I can do that. Furthermore, in the second embodiment, three photoelectric switches 61 to Although 63 pieces are arranged in sequence as an example, the present invention is not limited to this, and the present invention is not limited to this. , for example, only two photoelectric switches 61 and 62 are provided, and as shown in FIG. By mounting the electric switches 61 and 62 on the rail 81, they can be arranged sequentially. You may. Furthermore, in the second embodiment, the optical fibers 71, 71a are Although the present invention is not limited to this, as shown in FIGS. 21 to 26, Even when multiple lens-type photoelectric switches having lenses 82 and 83 are installed together, Similar effects can be obtained with each.

[0038] FIG. 27 is a perspective view showing a fourth embodiment of the photoelectric detection device of the present invention, and FIG. 29 is a side view showing the photoelectric switch included in the photoelectric detection device of FIG. A cross-sectional view of the photoelectric switch along line A; FIG. 30 is an enlarged cross-sectional view of part B in FIG. 29. It is.

[0039] In the photoelectric detection device of the fourth embodiment shown in FIG. 27, the photoelectric switch 81 and the next stage Photoelectric switches 82 are sequentially arranged on a rail 83 in close contact with each other. For example, photoelectric The basic configuration of the switch 81 is the same as that of the first embodiment, and the switch 81 has the same basic configuration as that of the first embodiment. 3, a light emitting section 22, a light receiving section 23, a gate circuit 24, an integrating circuit 25, and and determination circuit 26, a transmission light receiving section 33, and a pulse generation circuit 3 as a signal generation means. 4, a transmission light projecting section 35. The transmission provided in this embodiment As shown in FIG. 29, the light receiving section 33 includes a case 84 made of translucent resin and a It is attached to a circuit board 85 built into the case 84 and converts light passing through the case 84. The transmitting light receiving element 86 receives light, and the transmitting light projecting section 34 is also connected to other circuit boards. A transmitting light emitting element attached to the plate 87 and projecting transmitted light to the outside via the case 84 It consists of 88 children. These light receiving elements 86 and light emitting elements 88 are photoelectric They are arranged on a straight line L4 parallel to the arrangement direction of the switches 81 and 82, and are spaced apart from each other. The light-receiving axis of the light-receiving element 86 and the light-emitting axis of the light-emitting element 88 are aligned in the above-mentioned direction. It is set to match line L4. The case 84 also includes the straight line L4. Lens parts 89 and 90, which are placed on the top and project outward and inward, are integrally molded. has been done. For example, in the lens section 90 of the transmission light projection section 35, as shown in FIG. , the light emitting axis of the light emitting element 88 located on the straight line L4 is a lens portion 90 indicated by an arrow 91. The main axis L5 of the lens section 90 passes through the protruding part of the light projection range indicated by the arrow 92. , and the light emitting axis (straight line L4) of the light emitting element 88 and the lens main axis L5 are approximately aligned. The other lens portions 89 are set in parallel, and the same is true for the other lens portions 89. On the other hand, the light projecting section 22 A detection light emitting element (not shown) built in the base 84 and a light emitting element connected to this light emitting element An optical fiber 93 and a detection head (not shown) provided at the tip of the optical fiber 93 The light receiving section 23 also includes a detection light receiving element 94 built in the case 84. , an optical fiber 93a connected to this light receiving element 94, and this optical fiber 93a. and the detection head provided at the tip of the detection head. In addition, other photoelectric switches 82 is similarly configured.

[0040] Even in this fourth embodiment, the periodic optical pulse signal S1 passes through the straight line L4. When the optical pulse is transmitted to the photoelectric switch 81, the optical pulse is transmitted to the photoelectric switch 81. The signal S1 is received by the transmission light receiving element 86 through the lens section 89, and the pulse generation cycle is performed. The optical pulse signal S1 is synchronized with the optical pulse signal S1 by the optical path 34. A delay time signal delayed by a predetermined time from the optical pulse signal S1 or the optical pulse signal S1. A timing signal is generated and output to the detection light projector 22. Along with this, the light projecting section 2 2 is a detection light emitter according to the synchronized timing signal or delayed timing signal; Sensing light is intermittently projected from the element via the optical fiber 93 and the detection head. do. At this time, the reflected light reflected by the object to be detected is sent to the detection head and the optical fiber 93a. The light is received by the light receiving element 94 through the gate circuit 24 and the integrating circuit 25 in a predetermined manner. After processing in this order, the determination circuit 26 determines whether the timing matches the sensing light. The presence or absence of an object is determined based on the presence or absence of received light pulses. In addition, the transmission light emitting element The child 88 outputs the optical signal in synchronization with the synchronized timing signal or the delayed timing signal. The pulse signal S2 is projected through the lens section 90 and transmitted through the straight line L4 to the next stage. The signal is sent to the transmission light receiving element of the photoelectric switch.

[0041] The fourth embodiment configured in this manner also has the same effect as the first embodiment described above. Obtainable. Further, in this embodiment, the light is received through the lens section 89, and the lens section Since the light is projected through the light beam 90, the light transmission efficiency of the light pulse signal can be increased.

[0042] In addition, as shown in FIG. 31, a hemispherical lens portion protrudes inward from the case 84. When the lens parts 95 and 96 are provided integrally with the case 84, these lens parts 95 and 96 Since they do not protrude outward, the photoelectric switches 81 and 82 can be arranged closely together. As a result, the arrangement space for these photoelectric switches 81 and 82 can be reduced. At the same time, it is possible to prevent dirt and scratches from forming on the lens part. Furthermore, Figure 3 2, a semi-cylindrical lens portion 97 that protrudes inward and stands vertically; When the 98 is provided integrally with the case 84, the case 84 can be easily molded. I can do it.

[0043] FIG. 33 shows a photoelectric switch included in the fifth embodiment of the photoelectric detection device of the present invention. 34 is a side view of the photoelectric switch of FIG. 33, and FIG. 35 is a side view of the photoelectric switch of FIG. 34. 36 shows the photoelectric switches of FIG. 33 arranged on a rail. FIG.

[0044] In the photoelectric detection device of this fifth embodiment, a photoelectric switch 10 as shown in FIG. 1 and the next stage photoelectric switch 102 are sequentially arranged closely on the rail 103. There is. For example, the photoelectric switch 101 has a basic configuration similar to that of the first embodiment. Similarly, as shown in FIG. , an integrating circuit 25, a determining circuit 26, a transmission light receiving section 33, and a signal generating means. A pulse generating circuit 34 and a transmission light projecting section 35 are provided. And in this example The transmission light receiving section 33 provided above the case 104, as shown in FIG. A side-shaped transmission light-receiving element 10 that protrudes toward the direction and receives a periodic optical pulse signal S1. 5, the transmitting light projector 34 also protrudes upward from the case 104, and transmits the optical pulse signal. It consists of a side-type transmission light projecting element 106 that projects the signal S2. The light receiving element 105 and the light emitting element 106 are mounted on a circuit board 107 built into the case 104. A straight line L parallel to the arrangement direction of the photoelectric switches 101 and 102 6 and facing away from each other. Light receiving axis of light receiving element 105 , and the light emitting axis of the light emitting element 106 is set to coincide with the straight line L6. There is. A translucent top plate 108 is provided on the top of the case 104. The upper plate 108 has protrusions 109 and 1 that house the light receiving element 105 and the light emitting element 106. It has 10. On the other hand, the light projecting unit 22 is built in the case 104 and is shown in FIG. A detection light emitting element, an optical fiber 111 connected to this light emitting element, and this light It consists of a detection head (not shown) provided at the tip of the fiber 111, and The section 23 also includes a detection light receiving element (not shown) built into the case 104 and this light receiving element. The optical fiber 111a connected to the optical fiber 111a and the and the detection head. Note that the other photoelectric switches 102 are similarly It is configured.

[0045] Even in this fifth embodiment, the periodic optical pulse signal S1 passes through the straight line L6. When the optical pulse signal is transmitted from the right side of FIG. 35, the photoelectric switch 101 receives the optical pulse signal. S1 is received by the transmission light receiving element 105 via the protrusion 109 of the top plate 108, and the The presence or absence of an object is determined using the same procedure as in the first embodiment. Then, the transmitting light emitting element 1 06 generates an optical pulse in synchronization with the synchronous timing signal or the delayed timing signal. The signal S2 is projected onto the straight line L6 through the protrusion 110 of the top plate 108 as shown in FIG. It is sent to the left side, that is, to the next stage photoelectric switch 102. Then, the next stage photoelectric The switch 102 also determines the presence or absence of an object as described above according to the optical pulse signal S2. It is supposed to be done.

[0046] The fifth embodiment configured in this manner also has the same effect as the first embodiment described above. Obtainable. Furthermore, in this embodiment, the optical pulse signal is transmitted through the top plate 108. Since it is not necessary to do it through the side of the case 104, this case It is not necessary to provide a light-transmitting opening or window on the side surface of the space 104. And the case Since the case 104 is required to have various characteristics compared to the top plate 108, To reduce manufacturing costs and improve airtightness by making it easier to manufacture a gasket 104. I can do it.

[0047] In this embodiment, a photoelectric detection device consisting of two photoelectric switches 101 and 102 is used. Although the present invention is not limited to this case, the present invention is not limited to this case. Even if a photoelectric detection device is installed in one location, these photoelectric switches can be activated in sequence. can be done. Furthermore, in this embodiment, the optical fibers 109, 10 Although the case where an optical fiber type photoelectric switch with 9a is installed is shown as an example, this example The proposal is not limited to this, but a lens type having lenses 112 and 113 as shown in FIG. If multiple photoelectric switches are installed, the photoelectric switches must be operated one after the other. can be set. In addition, photoelectric switches 101 and 102 are placed on the rail 103. Instead, they may be connected to each other with screws 114. Furthermore, as shown in Figure 38, , lens-shaped protrusions that protrude inward from the protrusions 109 and 110 of the top plate 108, respectively. When 109a and 110a are integrally molded with the top plate 108, the optical transmission of the optical pulse signal is delivery efficiency can be increased. As shown in FIG. 39, the lens-like protrusion 109a is , the straight line L6 passes through the lens portion indicated by arrow 115, and the lens main axis L7 is aligned with arrow 1. 16, and these straight lines L6 (the light receiving area of the light receiving element 105) axis) and the lens main axis L7 are set substantially parallel, and the lens-like protrusion 109 b is similarly configured.

[0048] FIG. 40 shows a photoelectric switch included in the sixth embodiment of the photoelectric detection device of the present invention. 41 is a side view of the photoelectric switch in FIG. 40, and FIG. 43 is a line AA in FIG. 41. 36 shows the photoelectric switches of FIG. 40 arranged on a rail. FIG.

[0049] In the photoelectric detection device of this sixth embodiment, as shown in FIG. 1 and the next stage photoelectric switch 122 are sequentially arranged closely on the rail 123. There is. For example, the photoelectric switch 121 has a basic configuration similar to that of the first embodiment. Similarly, as shown in FIG. , an integrating circuit 25, a determining circuit 26, a transmission light receiving section 33, and a signal generating means. A pulse generating circuit 34 and a transmission light projecting section 35 are provided. And in this example As shown in FIG. 40, the provided transmission light receiving section 33 receives periodic optical pulse signals. A receiving light refracting body 124 that refracts the optical path of No. A transmitter is arranged to receive the optical pulse signal S1 refracted by the receiving optical refractor 124. The transmitting light receiving element 125 also projects the optical pulse signal S2. a transmitting light emitting element 126 disposed directly above the transmitting light emitting element 126; The optical pulse signal S2 projected from the light projection element 126 is refracted by refracting the optical path of the optical pulse signal S2. and a transmission light refractor 127 that guides the signal S2 to the next photoelectric switch 122. Ru. The light receiving element 125 and the light emitting element 126 are connected to a circuit built in the case 128. The light-receiving axis of the light-receiving element 125 is in the vertical direction, i.e., That is, the direction perpendicular to the straight line L8 parallel to the arrangement direction of the photoelectric switches 121 and 122 Similarly, the light emitting axis of the light emitting element 126 is also set in the vertical direction. Ru. The receiving light refracting body 124 and the transmitting light refracting body 127 are arranged in a case 128. They are each provided on a top plate 130 that is attached to the top and has translucency. Said The light refractive body 124 is arranged on the straight line L8 and is at an angle of 45 degrees with respect to the top plate 129. It consists of a mirror plate tilted clockwise in FIG. 43 by the angle, and the mirror plate in FIG. The optical pulse signal S1 incident from the left side is refracted downward. similar In addition, the light refractive body 127 is also arranged on the straight line L8 and is oriented toward the top plate 129. It consists of a mirror plate tilted counterclockwise in Figure 42 by an angle of 45 degrees, and the light is incident from below. The optical pulse signal S2 is refracted to the right side in FIG. On the other hand, The light unit 22 includes a detection light emitting element (not shown) built into the case 128, and this light emitting element. An optical fiber 131 connected to the element and an optical fiber provided at the tip of this optical fiber 131. The light receiving section 23 is also built into the case 128. a detection light-receiving element (not shown) and an optical fiber 131 connected to this light-receiving element. a, and the detection head provided at the tip of the optical fiber 131a. There is. Note that the other photoelectric switches 122 are similarly configured.

[0050] Even in this sixth embodiment, the periodic optical pulse signal S1 passes through the straight line L8. The photoelectric switch 121 then transmits the optical signal to the photoelectric switch 121. After the optical path of the pulse signal S1 is refracted downward by the light refracting body 124, the transmission light receiving element 12 5, and the presence or absence of an object is determined using the same procedure as in the first embodiment. and , the transmitting light emitting element 125 receives the synchronized timing signal or the delayed timing signal. The light pulse signal S2 is projected upward in synchronization with the signal, and the transmitting light refracting body 127 2 to the right and sends it to the next stage photoelectric switch 122. And the next step The photoelectric switch 122 also detects the presence or absence of an object as described above according to the optical pulse signal S2. It is designed to judge.

[0051] The sixth embodiment configured in this manner also has the same effect as the first embodiment described above. Obtainable. Furthermore, in this embodiment, the transmission of the optical pulse signal is performed using the upper plate 130. Since it is not necessary to do it through the side of the case 128, this case It is not necessary to provide a light-transmitting opening or window on the side surface of the space 128. This case 12 Case 8 is required to have various characteristics compared to the top plate 130, so Case 1 is 28 can be easily manufactured, reducing manufacturing costs and improving sealing performance. Wear.

[0052] In this embodiment, a photoelectric detection device consisting of two photoelectric switches 121 and 122 is used. Although the present invention is not limited to this case, the present invention is not limited to this case. Even if a photoelectric detection device is installed in one location, these photoelectric switches can be activated in sequence. can be done. Furthermore, in this embodiment, the light refracting body 1 each consisting of a mirror plate. 24 and 127, but as shown in FIG. 44, the prism bodies 132 and 133 are It is molded integrally with the face plate 134, and the total reflection surface 132a of one prism body 132 reflects the light beam. The optical path of the pulse signal S1 is refracted downward from the direction of the straight line L8, and the other prism body 13 The optical path of the optical pulse signal S2 is directed from the vertical direction to the right in FIG. When refracting to . Furthermore, as shown in FIG. 45, lens-like protrusions are provided on the prism bodies 135 and 136. In this case, the optical transmission efficiency of the optical pulse signal can be increased. The prism body 1 As shown in FIG. 46, the lens-shaped protrusion 135a of No. 35 It passes through the lens portion indicated by 7, and the lens main axis L9 passes through the light receiving range indicated by arrow 138. In addition, these straight lines L8 and the lens main axis L9 are set almost parallel, The other prism bodies 136 are similarly configured. Furthermore, as shown in FIG. Light refracting bodies 139 and 140 can also be provided in the middle of the long sides of the top plate 130. Furthermore, in this embodiment, an optical fiber having optical fibers 131 and 131a is used. Although the case where a bar-type photoelectric switch is installed is shown as an example, the present invention is not limited to this. As shown in 48, multiple lens-type photoelectric switches having lenses 141 and 142 are combined. Even if the photoelectric switches are provided, the photoelectric switches can be operated sequentially in the same manner. difference Furthermore, as shown in FIG. 145 and 146 can also be arranged respectively.

[0053] FIG. 50 shows a photoelectric switch included in the seventh embodiment of the photoelectric detection device of the present invention. 51 is a side view of the photoelectric switch of FIG. 50, and FIG. 52 is a side view of the photoelectric switch of FIG. 51. 53 shows the photoelectric switches of FIG. 50 arranged on a rail. FIG.

[0054] In the photoelectric detection device of this seventh embodiment, as shown in FIG. 1 and the next stage photoelectric switch 152 are sequentially arranged closely on the rail 153. There is. For example, the photoelectric switch 151 has a basic configuration similar to that of the first embodiment. Similarly, as shown in FIG. , an integrating circuit 25, a determining circuit 26, a transmission light receiving section 33, and a signal generating means. A pulse generating circuit 34 and a transmission light projecting section 35 are provided. And in this example As shown in FIG. 50, the transmission light receiving section 33 provided receives periodic optical pulse signals. A receiving light refracting body 154 that refracts the optical path of No. S1, and a light refracting body 154 directly below this light refracting body A transmitter is arranged to receive the optical pulse signal S1 refracted by the receiving optical refractor 154. The transmitting light receiving element 155 also projects the optical pulse signal S2. a transmitting light emitting element 156 disposed directly above the transmitting light emitting element 156; The optical pulse signal S2 projected from the light projection element 156 is refracted by refracting the optical path of the optical pulse signal S2. and a transmitting light refracting body 157 that guides the signal S2 to the next photoelectric switch 152. Ru. The light receiving element 155 and the light emitting element 156 are built into the case 158. The light-receiving axis of the light-receiving element 155 is in the vertical direction. direction, that is, a straight line L10 parallel to the arrangement direction of the photoelectric switches 151 and 152. Similarly, the light emitting axis of the light emitting element 156 is also set in the vertical direction. has been established. A translucent top plate 160 is provided on the top of the case 158. A translucent cap 161 is attached, and the cap 161 and the The light refracting bodies 154 and 157 are molded on the body. The light refractive body 154 is The clockwise direction of FIG. It consists of a mirror plate tilted in the direction, and the light incident from the left side of Fig. 52 via the straight line L10. The pulse signal S1 is refracted downward. Similarly, the light refractive body 157 also , arranged on the straight line L10 and at an angle of 45 degrees with respect to the top plate 159 in FIG. It consists of a mirror plate tilted counterclockwise, and the optical pulse signal S2 incident from below is shown in Figure 5. It is bent to the right of 2. On the other hand, the light projecting section 22 is connected to the case 158. A detection light emitter (not shown) built in and an optical fiber connected to this light emitter. bar 162 and a detection head (not shown) provided at the tip of this optical fiber 162. The light receiving section 23 also includes a detection light receiving section (not shown) built into the case 158. element, an optical fiber 162a connected to this light receiving element, and this optical fiber 16 The detection head 2a is provided at the tip of the detection head 2a. Please note that other photoelectric switches The switch 152 is similarly configured.

[0055] Also in this seventh embodiment, the periodic optical pulse signal S1 passes along the straight line L10. When the light is transmitted to the photoelectric switch 151, the photoelectric switch 151 receives the light. After the optical path of the pulse signal S1 is refracted downward by the light refracting body 154, the transmission light receiving element 1 55, and the presence or absence of an object is determined using the same procedure as in the first embodiment. stop Then, the transmission light emitting element 156 transmits the synchronization timing signal or the delay timing signal. The optical pulse signal S2 is projected upward in synchronization with the input signal, and the transmitting optical refracting body 157 It is refracted to the right in FIG. 52 and sent to the next stage photoelectric switch 152. And the applicable The next stage photoelectric switch 152 also detects the object as described above in response to the optical pulse signal S2. It is designed to determine the presence or absence.

[0056] Even in the embodiment configured in this way, it is possible to obtain the same effect as the first embodiment described above. I can do that. Furthermore, in this embodiment, the optical pulse signal is transmitted via the top plate 160. This case 1 It is not necessary to provide an opening or a window for light transmission on the side surface of 58. And case 158 Since the case 15 is required to have various characteristics compared to the top plate 140, 8 can be easily manufactured, reducing manufacturing costs and improving sealing performance. Ru.

[0057] Note that in this embodiment, a photoelectric detection device consisting of two photoelectric switches 151 and 152 is used. Although the present invention is not limited to this case, the present invention is not limited to this case. Even if a photoelectric detection device is installed in one location, these photoelectric switches can be activated in sequence. can be done. Furthermore, in this embodiment, the light refracting body 1 each consisting of a mirror plate. 54 and 157, but as shown in FIG. It is molded integrally with the cap 161, and the total reflection surface 163a of one prism body 163 emits light. The optical path of the pulse signal S1 is refracted downward, and the total reflection surface 16 of the other prism body 164 When 4a is configured to refract the optical path of the optical pulse signal S2 to the right in FIG. Since the number of parts is reduced, costs can be reduced. Furthermore, Figure 5 5, when lens-like protrusions are provided on the prism bodies 165 and 166, the optical path The optical transmission efficiency of the pulse signal can be increased. Furthermore, as shown in FIG. A light shielding portion 167 is provided on the cap 161, and the cap 161 is moved horizontally as necessary. After rotating the cap 161 by 180 degrees, attach the cap 161 to the case 158. Therefore, the light shielding part 167 is made to face the light receiving element 135 and the light emitting element 136 to receive light. Blocks light reception to the element 155 and light emission from the light emitting element 156 to prevent leakage of light emission. You can also. Furthermore, in this seventh embodiment, the optical fiber 162, Although the case of an optical fiber type photoelectric switch having 162a is illustrated, the present invention is not limited to this. However, as shown in FIG. Even if multiple switches are installed in one place, the corresponding photoelectric switches will be operated one after another. can be done.

[0058]

[Effect of the idea]

Since the present invention is configured as described above, multiple photoelectric switches can be installed in one place. can be activated sequentially by the transmission of optical pulse signals, and thus the circuit structure The light emitting timing between photoelectric switches can be adjusted without the need for complicated mutual interference prevention measures. It is possible to reliably prevent mutual interference between

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a first embodiment of a photoelectric detection device of the present invention.

FIG. 2 is a perspective view showing a state in which photoelectric switches of the photoelectric detection device of FIG. 1 are arranged on a rail.

FIG. 3 is a block diagram showing a photoelectric switch of the photoelectric detection device of FIG. 1;

FIG. 4 is a perspective view showing a second embodiment of the photoelectric detection device of the present invention.

FIG. 5 is an exploded perspective view showing a photoelectric switch of the photoelectric detection device of FIG. 4;

6 is a perspective view showing a photoelectric detection device equipped with a lens-type photoelectric switch corresponding to the photoelectric switch of FIG. 5. FIG.

7 is an exploded perspective view of the optical fiber type photoelectric switch of FIG. 6. FIG.

FIG. 8 is an exploded perspective view of a photoelectric switch showing an application example of the second embodiment.

9 is an exploded perspective view showing a lens-type photoelectric switch corresponding to the photoelectric switch of FIG. 8. FIG.

FIG. 10 is a perspective view showing a third embodiment of the photoelectric detection device of the present invention.

FIG. 11 is a side view showing a photoelectric switch included in ten photoelectric detection devices.

12 is a cross-sectional view of the photoelectric switch taken along line AA in FIG. 11. FIG.

FIG. 13 is an enlarged cross-sectional view of section B in FIG. 12;

FIG. 14 is a diagram showing the timing relationship of signals of the photoelectric detection device of FIG. 10;

FIG. 15 is a sectional view showing a photoelectric switch equipped with a filter member as an application example of the third embodiment.

16 is an enlarged cross-sectional view of section C in FIG. 15. FIG.

FIG. 17 is a sectional view showing a photoelectric switch equipped with a double-shaped filter as an application example of the third embodiment.

18 is an enlarged cross-sectional view of section D in FIG. 17. FIG.

FIG. 19 is a sectional view showing a photoelectric switch in which the case itself is formed of a filter member as an applied example of the third embodiment.

FIG. 20 is a perspective view showing a state in which photoelectric switches are arranged on a rail.

21 is a side view of a lens-type photoelectric switch corresponding to the photoelectric switch of FIG. 11. FIG.

22 is a cross-sectional view of the photoelectric switch taken along line E-E in FIG. 21. FIG.

23 is an enlarged cross-sectional view of section F in FIG. 22. FIG.

FIG. 24 is a cross-sectional view of a photoelectric switch equipped with a filter.

FIG. 25 is a sectional view showing a photoelectric switch equipped with a double-shaped filter as an application example of the third embodiment.

26 is an enlarged cross-sectional view of section H in FIG. 25. FIG.

FIG. 27 is a perspective view showing a fourth embodiment of the photoelectric detection device of the present invention.

28 is a side view showing a photoelectric switch included in the photoelectric detection device of FIG. 27. FIG.

29 is a cross-sectional view of the photoelectric switch taken along line AA in FIG. 28. FIG.

30 is an enlarged cross-sectional view of section B in FIG. 29; FIG.

FIG. 31 is a sectional view showing a photoelectric switch equipped with a hemispherical lens body that protrudes only inward as an application example of the fourth embodiment.

FIG. 32 is a sectional view showing a photoelectric switch equipped with a semi-cylindrical lens body as an application example of the fourth embodiment.

FIG. 33 is a perspective view showing a photoelectric switch included in a fifth embodiment of the photoelectric detection device of the present invention.

FIG. 34 is a side view of the photoelectric switch of FIG. 33;

35 is a cross-sectional view taken along line AA in FIG. 34. FIG.

FIG. 36 is a perspective view showing the photoelectric switches of FIG. 33 arranged on a rail.

37 is a perspective view showing a photoelectric detection device equipped with a lens-type photoelectric switch corresponding to the optical fiber-type photoelectric switch of FIG. 36. FIG.

FIG. 38 is a sectional view showing a photoelectric switch in which a lens-like projection is provided on the top plate as an application example of the fifth embodiment.

39 is an enlarged cross-sectional view of section B in FIG. 38. FIG.

FIG. 40 is a perspective view showing a photoelectric switch included in a sixth embodiment of the photoelectric detection device of the present invention.

FIG. 41 is a side view of the photoelectric switch of FIG. 40;

42 is a cross-sectional view taken along line AA in FIG. 41. FIG.

43 is a perspective view showing the photoelectric switches of FIG. 40 arranged on a rail; FIG.

FIG. 44 is a sectional view showing a photoelectric switch having a prism body on the top plate as an application example of the sixth embodiment.

FIG. 45 is a sectional view showing a photoelectric switch equipped with a prism body having lens-like protrusions as an applied example of the sixth embodiment.

46 is an enlarged cross-sectional view of section B in FIG. 45. FIG.

FIG. 47 is a perspective view showing a case where a light refractive body is provided in the middle of the long side of the top plate as an applied example of the sixth embodiment.

48 is a perspective view showing a photoelectric detection device equipped with a lens-type photoelectric switch corresponding to the optical fiber-type photoelectric switch of FIG. 43. FIG.

49 is a perspective view showing a photoelectric detection device equipped with a lens-type photoelectric switch corresponding to the optical fiber-type photoelectric switch of FIG. 47. FIG.

FIG. 50 is a perspective view showing a photoelectric switch included in a seventh embodiment of the photoelectric detection device of the present invention.

FIG. 51 is a side view of the photoelectric switch of FIG. 50;

52 is a sectional view taken along line AA in FIG. 51. FIG.

53 is a perspective view showing the photoelectric switches of FIG. 50 arranged on a rail; FIG.

FIG. 54 is a sectional view showing a photoelectric switch equipped with a prism body as an application example of the seventh embodiment.

FIG. 55 is a sectional view showing a case where a prism body having lens-like projections is provided as an applied example of the seventh embodiment.

FIG. 56 is a perspective view showing a cap provided with a light shielding part as an application example of the seventh embodiment.

57 is a perspective view showing a photoelectric detection device equipped with a lens-type photoelectric switch corresponding to the optical fiber-type photoelectric switch of FIG. 53. FIG.

FIG. 58 is an exploded perspective view showing a conventional example of an optical fiber type photoelectric switch.

FIG. 59 is an exploded perspective view showing a conventional example of a lens-type photoelectric switch.

FIG. 60 is a block diagram illustrating the operation of a conventional photoelectric switch.

FIG. 61 is a block diagram illustrating the operation of another conventional photoelectric switch.

[Explanation of symbols]

22 Light projection part 23 Light receiving part 31, 32 Photoelectric switch 33 Transmission light projection part 34 Pulse generation circuit (signal generation means) 35 Transmission light receiving section 37 Transmission light receiving element 38 Transmission light emitting element 41, 42 Photoelectric switch 46 Transmission light receiving element 48 Transmission light emitting element 44a Light receiving window 47a floodlight window 61-63 Photoelectric switch 67 Transmission light receiving element 70 Transmission light emitting element 65a Light receiving window 68a floodlight window 81, 82 Photoelectric switch 84 case 86 Transmission light receiving element 88 Transmission light emitting element 89, 90 Lens section 101, 102 Photoelectric switch 105 Transmission light receiving element 106 Transmission light emitting element 108 Top plate 121, 122 Photoelectric switch 124 Receiving light refractor 125 Transmission light receiving element 126 Transmission light emitting element 127 Light refractor for transmission 130 Top plate 151, 152 Photoelectric switch 154 Receiving light refractor 155 Transmission light receiving element 156 Transmission light emitting element 157 Light refractor for transmission 160 Top plate 161 Cap

──────────────────────────────────────────────── ─── Continuation of front page (72) Creator Ikuro Ouchi 60-2 Shimomachi, Yoshioka, Yamato-machi, Kurokawa-gun, Miyagi Prefecture

Claims (2)

[Scope of utility model registration request] 1. A detection light projecting element that intermittently projects sensing light in accordance with a timing signal of a predetermined period; and a detection light receiving element that receives reflected light reflected from an object to be detected; In a photoelectric detection device in which a plurality of photoelectric switches are arranged close to each other or closely arranged to determine the presence or absence of an object based on whether or not an optical pulse whose timing coincides with the sensing light is received, a periodic optical pulse signal is applied to the photoelectric switch. a transmission light-receiving element that receives light; and a transmission light receiving element that generates a synchronization timing signal that synchronizes with the optical pulse signal or a delayed timing signal that is delayed by a predetermined time than the optical pulse signal based on the optical pulse signal, and emits the detection light. A signal generating means for outputting to the element, a transmitting light projecting element for projecting a periodic optical pulse signal in synchronization with the synchronized timing signal or the delayed timing signal, and these transmitting light receiving elements and transmitting light receiving elements are provided. The light emitting elements are arranged in a straight line substantially parallel to the arrangement direction of the photoelectric switches with the light emitting elements facing away from each other, and the light receiving axis of the transmitting light receiving element and the light emitting axis of the transmitting light emitting element are aligned as described above. A photoelectric detection device characterized in that the optical pulse signal is set to coincide with a straight line and transmits the optical pulse signal from a transmitting light emitting element of a preceding stage photoelectric switch to a transmitting light receiving element of a next stage photoelectric switch. 2. A detection light projecting element that intermittently projects sensing light in accordance with a timing signal of a predetermined period; and a detection light receiving element that receives reflected light reflected by an object to be detected; In a photoelectric detection device in which a plurality of photoelectric switches are arranged close to each other or closely arranged to determine the presence or absence of an object based on whether or not an optical pulse whose timing coincides with the sensing light is received, the periodicity of the incident light on the photoelectric switch is a receiving optical refractor that refracts the optical path of the optical pulse signal;
A transmission light receiving element that receives the optical pulse signal refracted by the optical refractor, and a synchronization timing signal that synchronizes with the optical pulse signal based on the optical pulse signal or a delay that is delayed by a predetermined time than the optical pulse signal. signal generating means for generating a timing signal and outputting it to the detection light projecting element;
A transmitting light projecting element that projects a periodic optical pulse signal in synchronization with the synchronous timing signal or the delayed timing signal; A photoelectric detection device characterized by being provided with a transmission refractor that guides a pulse signal to a next-stage photoelectric switch.