JP4846325B2 - Multi-optical axis photoelectric sensor, projector, and light receiver - Google Patents

Description

  The present invention relates to a multi-optical axis photoelectric sensor, a projector, and a light receiver.

2. Description of the Related Art Conventionally, a multi-optical axis photoelectric sensor provided with a plurality of light projectors and light receivers has been provided. In this multi-optical axis photoelectric sensor, it is necessary to synchronize a light projector and a light receiver. This synchronization method is roughly divided into two types. One is a method in which a projector and a light receiver are connected by a synchronization signal line, and a synchronization signal is transmitted and received between the projector and the light receiver via the synchronization signal line. .
Japanese Patent Publication No. 5-29168

  However, the above method is excellent in that the synchronization signal is surely performed, but it is disadvantageous in that a synchronization signal line needs to be provided. On the other hand, as another synchronization method, there is an optical synchronization method. As shown in Patent Document 1, a synchronization light projecting / receiving element is arranged in each of a projector and a light receiver, and a synchronization signal is transmitted by light. To be transmitted. According to this, since the synchronization signal line is unnecessary, problems such as labor and space for arranging the synchronization line can be effectively solved. However, in terms of certainty of signal transmission / reception, it has not reached line synchronization. As described above, each of the line synchronization method and the optical synchronization method has advantages and disadvantages, and it is desirable to be able to select an appropriate one according to the use situation.

  The present invention has been completed based on the above situation, and it is possible to alternatively use transmission / reception of a wired synchronization signal and transmission / reception of a wireless synchronization signal with a simple configuration. Provide a possible configuration.

As a means for achieving the above object, the invention of claim 1 is a projector having a plurality of light projecting elements, and a plurality of light projectors arranged in pairs so as to form an optical axis with each light projecting element. A light receiving device including the light receiving element, a light projecting control unit that controls a light projecting timing of each light projecting element, and a light reception signal from each light receiving element that forms the optical axis facing each light receiving element. A light-blocking detection means for detecting a light-blocking state on the optical axis by detecting in synchronization with the light projecting timing of the light projecting element, and the light projector and the light receiver are connected by a synchronization line, and are synchronized via the synchronization line. generating a wired synchronization signal generating means for generating a wired synchronization signal used when transmitting and receiving signals, the wireless synchronization signal used when sending and receiving the synchronization signal by radio between said photodetector and said light projector wireless synchronization signal generating means for And switching means for switching, and a connector for wired synchronization the sync line is connected, and a connector for wireless synchronization to be used in the wireless, and shared connector that selectively connected to said common connector Determining means for determining whether one of the wired synchronization connector and the wireless synchronization connector is connected, the switching means based on the determination result of the determination means based on the determination result of the determination means When switching between the synchronization signal generating means and the wireless synchronization signal generating means, and switching to the wireless synchronization signal generating means, the wireless synchronization signal generating means can detect the optical signal for detection during the light projecting / receiving operation for detection. When transmitting / receiving the synchronization signal, the wireless synchronization signal is output as a signal having a different pulse interval, and transmitted from at least one of the light projecting elements in the projector. Is characterized in that it is received by the light receiving elements constituting the optical axis and its light emitting element.

The invention of claim 2 is the multi-optical axis photoelectric sensor according to claim 1, wherein the common connector, and the voltage level at which the connector for the wired synchronization has been connected, the connector wireless synchronization is connected A determination terminal having a different voltage level at the time of detection, wherein the determination means switches between the wired synchronization signal generation means and the wireless synchronization signal generation means based on the voltage level of the determination terminal. And

According to a third aspect of the present invention, in the multi-optical axis photoelectric sensor, a light projector having a plurality of light projecting elements, and a plurality of light receiving elements arranged in pairs so as to form an optical axis with each light receiving element. The light receiving device, the light projecting control means for controlling the light projecting timing of each light projecting element, and the light projecting signal of each light projecting element that forms the optical axis facing each light receiving element. A light-blocking detection means for detecting a light-blocking state on the optical axis by detecting in synchronization with the optical timing, and connecting the projector and the light receiver with a synchronization line, and transmitting and receiving a synchronization signal via the synchronization line a wired synchronization signal generating means for generating a wired synchronization signal used in performing, wireless for generating a wireless synchronization signal used when transmitting and receiving wirelessly synchronizing signals between said photodetector and said light projector Synchronization signal generating means, Is configured to be detachable one, in the case that has been switched to the wireless synchronous signal generating means, the wireless synchronization signal generating means, the detection light signal upon the detection light emission and reception operation, the synchronization signal At the time of transmission / reception, the wireless synchronization signal is output as a signal having a different pulse interval and transmitted from at least one of the light projecting elements in the light projector, and the light receiving element constituting the light projecting element and the optical axis It is characterized by receiving .

According to a fourth aspect of the present invention, a plurality of light projecting elements arranged in pairs so as to form an optical axis respectively with a plurality of light receiving elements provided in the light receiver, and the light projecting timing of each light projecting element are controlled. And detecting a light reception signal from each light receiving element of the light receiver in synchronization with a light projecting timing of the light projecting element that forms the optical axis facing each light receiving element. This is a projector used in a multi-optical axis photoelectric sensor provided with a light-blocking detection means for detecting a light-blocking state on the optical axis, wherein the projector and the light receiver are connected by a synchronization line and synchronized via the synchronization line. generating a wired synchronization signal generating means for generating a wired synchronization signal used when transmitting and receiving signals, the wireless synchronization signal used when sending and receiving the synchronization signal by radio between said photodetector and said light projector wireless synchronization signal generation hands to When a switching means for switching, and a connector for wired synchronization the sync line is connected, and a connector for wireless synchronization to be used in the wireless, and shared connector that selectively connected, the shared connector Determining means for determining whether one of the wired synchronization connector and the wireless synchronization connector is connected, and when switched to the wireless synchronization signal generation means, the wireless synchronization The signal generator outputs the detection optical signal during the detection light projecting / receiving operation and the wireless synchronization signal during transmission / reception of the synchronization signal as signals having different pulse intervals, respectively, and outputs at least one of the light projectors. characterized Rukoto is transmitted from the light emitting element.

The invention according to claim 5 controls a plurality of light projecting elements arranged in pairs with each of a plurality of light receiving elements provided in the light receiver so as to form an optical axis, and a light projecting timing of each light projecting element. Projecting control means for detecting the light reception signal from each light receiving element in synchronization with the light projecting timing of the light projecting element that forms the optical axis opposite to each light receiving element. A projector used in a multi-optical axis photoelectric sensor provided with a light-blocking detection means for detecting a light-blocking state on an optical axis, wherein the projector and the light receiver are connected by a synchronization line, and a synchronization signal is transmitted and received through the synchronization line. a wired synchronization signal generating means for generating a wired synchronization signal used in performing, wireless generates a wireless synchronization signal used when sending and receiving the synchronization signal by radio between said photodetector and said light projector synchronization Alternative to signal generation means Is configured to be detachable, wherein when switched to wireless synchronization signal generating means, the wireless synchronization signal generating means, the detection light signal upon the detection light emission and reception operation, upon reception of the synchronization signal the radio synchronization signal, and wherein the Rukoto is transmitted from at least one of the light emitting element in the projector and output as pulse interval different signals each other.

The invention of claim 6 is provided with a plurality of light receiving elements arranged in pairs so as to form an optical axis with each light receiving element in a light projector provided with a plurality of light projecting elements,
The light projection control means for controlling the light projection timing of each light projecting element of the light projector, and the light projection timing of the light projecting element that forms the optical axis of the light receiving signal from each light receiving element facing each light receiving element. And a light-blocking detector for detecting a light-blocking state on the optical axis by detecting in synchronization with a light receiver used in a multi-optical axis photoelectric sensor, wherein the projector and the light receiver are connected by a synchronization line. and performs transmission and reception of the synchronizing signal by radio and wired synchronization signal generating means for generating a wired synchronization signal, between said photodetector and said light projector used when sending and receiving the synchronization signal via the synchronization line A wireless synchronization signal generating means for generating a wireless synchronization signal to be used at the time, a switching means for switching, a wired synchronization connector to which the synchronization line is connected, and a wireless synchronization connector to be used at the time of the wireless system The A common connector that can be connected, and a determination unit that determines whether the wired synchronization connector or the wireless synchronization connector is connected to the shared connector, and the switching unit includes: Based on the discrimination result of the discrimination means, the wired synchronization signal generation means and the wireless synchronization signal generation means are switched, and when switched to the wireless synchronization signal generation means, the wireless synchronization signal generation means Outputs at least one of the light projections in the projector by outputting a detection optical signal during detection light projecting / receiving operation and a wireless synchronization signal during transmission / reception of the synchronization signal as signals having different pulse intervals, respectively. Transmission is performed from an element, and reception is performed by the light receiving element constituting the light projecting element and the optical axis .

The invention of claim 7 is provided with a plurality of light receiving elements arranged in pairs so as to form an optical axis with each light receiving element in a light projector provided with a plurality of light projecting elements, and each light projecting element of the light projector A light projecting control means for controlling the light projecting timing, and a light receiving signal from each light receiving element is detected in synchronism with the light projecting timing of the light projecting element that forms the optical axis facing each light receiving element. And a light-blocking detector for detecting a light-blocking state on the optical axis by a light-receiving device used in a multi-optical axis photoelectric sensor, wherein the projector and the light-receiving device are connected by a synchronization line, a wired synchronization signal generating means for generating a wired synchronization signal used when sending and receiving the synchronization signal, the wireless synchronization signal used when sending and receiving the synchronization signal by radio between said photodetector and said light projector generate wireless same A signal generating means, is configured to be selectively attached and detached, when switched to the wireless synchronization signal generating means, the wireless synchronization signal generating means, for detecting light at the time of detecting light emission and reception operation When transmitting and receiving the synchronization signal, the wireless synchronization signal is output as a signal having a different pulse interval, and transmitted from at least one of the light projecting elements in the projector, and the light projecting element and the optical axis It receives with the said light receiving element which comprises. The light receiver characterized by the above-mentioned .

<Inventions of Claims 1, 3 , 4 , 5 , 6 , and 7>
According to the first, third , fourth , fifth , sixth and seventh aspects of the invention, it is possible to alternatively use transmission / reception of a wired synchronization signal and transmission / reception of a wireless synchronization signal.
Further, it is possible to switch between transmission / reception of a wired synchronization signal and transmission / reception of a wireless synchronization signal without performing a complicated operation and without using a complicated configuration.
Further, the light projecting element and the light receiving element used for detection can also be used for transmission / reception of a wireless synchronization signal. Accordingly, since it is not necessary to provide a separate component for the synchronization signal, it is possible to effectively reduce the number of components, the apparatus size, and the cost.

<Invention of Claim 2 >
According to the invention of claim 2 , it is possible to easily realize a configuration capable of automatically switching between a wired synchronization method and a wireless synchronization method.

The related art of the present invention will be described below with reference to the accompanying drawings.
< Related technology 1>
A first related technique of the present invention will be described with reference to FIGS.
FIG. 1 is a block diagram of a multi-optical axis photoelectric sensor according to the related art when a wireless synchronization method (optical synchronization method) is used.
The multi-optical axis photoelectric sensor of the related technology includes a projector 10 in which a plurality (four in this case) of detection light projecting elements 11 (for example, LEDs) are arranged in a row, and the four detection light projecting elements 11. The light receiving device 20 in which four detection light receiving elements 21 (for example, photodiodes) paired with each of the light receiving devices 21 are arranged to face each other with a predetermined detection area interposed therebetween. The light projector 10 includes a plurality of drive circuits 12 provided for each detection light projecting element 11 (hereinafter also simply referred to as the light projecting element 11), and a light projecting side CPU 14 connected to the drive circuit 12. Yes.

  On the other hand, the light receiver 20 is provided with a plurality of switch elements 25, and an output terminal of each detection light-receiving element 21 (hereinafter also simply referred to as the light-receiving element 21) is connected to one lead portion of the switch elements 25. In addition, the other lead portion is commonly connected to the input terminal of the object detection comparator 22. Further, the control terminal 25A provided in each switch element 25 is connected to the output terminal of the light receiving side CPU 24, and each switch element 25 is always in an OFF state. And it is comprised so that it may be selectively turned on by control of CPU24.

  The comparator 22 compares the level of the received light signal that is amplified by each of the light receiving amplifiers 26 and sequentially transmitted with a preset threshold value. Here, the comparator 22 is configured to output a high level signal when the received light signal level is equal to or higher than a threshold value, and to output a low level signal when the level is smaller than the threshold value.

Next, the characteristic part of this related technique is demonstrated.
As described above, the light projector 10 is provided with a plurality of light projecting elements 11, and the light receiver 20 is provided with a plurality of light receiving elements 21 arranged in pairs so as to form an optical axis with each of the light projecting elements 11. Is provided. The light projecting timing of each light projecting element 11 is controlled by the light projecting side CPU 14 corresponding to the light projecting control means.

  The light receiving signal from each light receiving element 21 is detected in synchronization with the light projecting timing of the light projecting element 11 that forms the optical axis opposite to each light receiving element, thereby detecting the light blocking state on the optical axis. ing. The light receiving side CPU 24 corresponds to a light shielding detecting means.

As shown in FIGS. 1 and 2, the related technology is configured to transmit and receive a wireless synchronization signal (transmission and reception of an optical synchronization method) without connecting the projector 10 and the light receiver 20 with a synchronization line. On the other hand, as shown in FIGS. 3 and 4, the projector 10 and the light receiver 20 are connected by a synchronization line, and a synchronization signal can be transmitted and received through the synchronization line 40. Yes.

  The projector 10 and the light receiver 20 are connected to the projector 10 via a synchronization line 40, and a wired synchronization signal generation means 51 (which generates a wired synchronization signal used when transmitting / receiving a synchronization signal via the synchronization line 40) Hereinafter, it is also referred to as line synchronization means 51) and wireless synchronization signal generation means 52 (hereinafter also referred to as optical synchronization means 52) used when transmitting and receiving wireless synchronization signals between the projector 10 and the light receiver. ) And are provided. And these are switched and used by control of CPU14. That is, transmission / reception of a wired synchronization signal and transmission / reception of a wireless synchronization signal can be alternatively used. The CPU 14 corresponds to switching means.

  As shown in FIG. 2, in the case of the optical synchronization method, the wireless synchronization connector 61 is connected to the shared connector 70 of the projector 10. On the other hand, in the case of the line synchronization method, the wired synchronization connector 60 to which the synchronization line 40 is connected is connected to the common connector 70. That is, the shared connector 70 can alternatively connect the wireless synchronization connector 61 and the wired synchronization connector 60.

Further, the projector 10 is configured so that it can be determined whether the wired synchronization connector 60 or the wireless synchronization connector 61 is connected to the shared connector 70. In this related technology , the CPU 14 corresponds to a determination unit. The CPU 14 also corresponds to a switching unit that switches between the wired synchronization signal generation unit 52 and the wireless synchronization signal generation unit 51 based on the determination result.

  Specifically, the shared connector 70 includes a determination terminal 72 having a voltage level when the wired synchronization connector 60 is connected and a voltage level when the wireless synchronization connector 61 is connected, The CPU 14 is configured to switch between the wired synchronization signal generation unit 52 and the wireless synchronization signal generation unit 51 based on the voltage level of the determination terminal 72. The terminal 61b that is the counterpart of the discrimination terminal 72 in the wireless synchronization connector 61 is connected to the ground line, and a predetermined voltage is applied to the terminal 60b that is the counterpart of the discrimination terminal 72 in the wired synchronization connector 60. It is in a state. The CPU 14 can determine which connector is connected by detecting the voltage level of the determination terminal 72, and selects a circuit corresponding to the connected connector.

The line synchronization means 51 is configured as an electronic circuit (for example, a pulse generation circuit that generates pulses at intervals), and outputs a synchronization signal to the synchronization line 40 in accordance with a selection signal from the CPU 14. It is configured. The line synchronization means 51 may be constituted by a CPU.
The light synchronization means 52 is a means for giving a synchronization signal to the light projecting element 15 according to the selection by the CPU 14. The optical synchronization means 52 may be realized by, for example, the CPU 14 as long as it can generate a synchronization signal, and is an electronic circuit different from the CPU (for example, a drive that generates a pulse at a predetermined timing and drives a light projecting element). Circuit) or the like.
In this related technology , as shown in FIG. 1, the light projector 10 is provided with a light-sending element 15 for optical synchronization, and when the voltage level of the determination terminal 72 is a low level equal to or lower than a threshold value, as shown in FIG. Will be adopted. In FIG. 2, the light projecting element 15 and the like are omitted.

On the other hand, as shown in FIG. 4, when the voltage level of the determination terminal 72 is a high level equal to or higher than the threshold value, the configuration shown in FIG. 3 is adopted. In FIG. 3, the light projecting element 15 is omitted, but in this case, the light projecting element 15 is not used.
In the related technology , in the case of the optical synchronization method, the dedicated light projecting element 15 and the light receiving element 27 are used. However, when the light synchronization method is selected, any one of the light projecting elements 11 is synchronized. The light receiving element 21 may be made to function as a light receiving element for synchronization, and the light receiving element 21 opposed thereto may be made to function as a light receiving element for synchronization.

< Related technology 2>
Next, related technology 2 will be described.
When sending and receiving wireless synchronization signal between the projector 10 and the light receiver 20, but it may also be configured to check the reception of the wireless synchronization signals. In this case, the light receiving side CPU 24 can function as a confirmation unit. In this way, it is possible to switch between a wired synchronization method and a wireless synchronization method without using a complicated mechanical configuration.

  For example, in the example of FIG. 5, in S10, the light receiving side CPU 24 determines whether or not an identification signal that can specify the optical synchronization method has been acquired. Enable the synchronization method (select the wireless synchronization signal generation means). On the other hand, if there is no identification information and a predetermined time has elapsed, the line synchronization method is validated (that is, the wired synchronization signal generating means is selected) in S30. In this way, the switching process can be appropriately performed based on the information of the wired synchronization method without using a complicated mechanical configuration.

Moreover, you may make it like FIG.
In the example of FIG. 6, in S <b> 100, it is determined whether or not an identification signal (here, a synchronization signal of the line synchronization method) that can identify the line synchronization method has been acquired by the light receiving side CPU 24. In this case, the process proceeds to Y, and the line synchronization method is validated in S130 (a wired synchronization signal generation unit is selected). On the other hand, if there is no identification information and a predetermined time has elapsed, the optical synchronization method is validated (that is, the wireless synchronization signal generating means is selected) in S120. In this way, it is possible to appropriately perform the switching process based on the information of the line synchronization method without using a complicated mechanical configuration.

< Related technology 3>
Next, related technology 3 will be described.
In the related art , the switching process is performed based on the terminal state of the connector. For example, a switch means such as a dip switch capable of external operation is provided, and the CPU 14 detects the switch state of the switch means, and the switch Based on the state, the wired synchronization signal generating means and the wireless synchronization signal generating means may be switched. In this way, it is possible to switch between a wired synchronization method and a wireless synchronization method by an external operation. Therefore, the configuration is easy to use and excellent in operability.

<Other related technologies and embodiments>
The present invention is not limited to the following embodiments described with reference to the above description and drawings, and can be implemented with various modifications other than those described below without departing from the scope of the invention.
(1) In the related technique 1, when transmitting and receiving a synchronization signal by the optical synchronization method, the optical synchronization projecting the optical axis at a position different from the optical axis by the light projecting element 11 and the light receiving element 21 for detection. The light emitting / receiving operation is performed using the optical element 15 and the light-synchronizing light-receiving element 27. However, the optical axis of the light-emitting element 11 and the light-receiving element 21, the light-synchronizing light-projecting element, and the light-synchronizing light-receiving element are used. These optical axes may be shared. In the example of FIG. 7, a light synchronization light projecting element 94 is provided orthogonal to the optical axis L of the light projecting element 11 for detection and the light receiving element 92, and light for light synchronization from the light projecting element 94 is provided. Is reflected by the half mirror 92 at a right angle. The light projecting element 94 is driven by an optical cycle means 96 composed of a drive circuit similar to the wireless synchronization signal generating means 52 described above. The light receiving element 93 for optical synchronization is connected to the light receiving amplifier 95 and is disposed so as to form an optical axis orthogonal to the optical axis L formed by the light projecting element 11 and the light receiving element 21. Light is received by the light-synchronizing light receiving element 93 via the half mirror 92 and the half mirror 93. That is, a part of the optical path of the light synchronizing light projecting element 94 is shared with the optical axis L. In this method, when detecting by the optical synchronization method, the detection operation is not performed by the lowermost detection element 11 and the light receiving element, and when detecting by the line synchronization method. The light from the lowermost detection element is input to the light receiving element 21 via the half mirror 91 and the half mirror 92.
(2) In the related technology and the first embodiment below , the example in which the means for line synchronization and the means for optical synchronization are provided on the main body side is shown. However, as shown in FIGS. 8 and 9, these are provided on the connector side. It may be done. In FIG. 9, the line synchronization method and the optical synchronization method are switched according to the state of the determination terminal 77. The terminal 78 is provided with a terminal 78 for giving a signal to the optical synchronization means 52. The terminal 78 can also give a signal to the line synchronization means 51. The line synchronization means 51 and the optical synchronization means can be configured in the same manner as in the related technique 1.
(3) In the related technique , an example in which the synchronization light is transmitted and received using the synchronization light projecting element 15 and the synchronization light receiving element 27 different from the detection light projecting element 11 and the detection light receiving element 21 is shown. However, in one embodiment of the present invention, the light projecting / receiving operation of at least one of the light projecting elements 11 for detection in the light projector 10 and the light receiving element 21 for detection that constitutes the optical axis of the light projecting element 11 for detection, A wireless synchronization signal is transmitted and received between the projector 10 and the light receiver 20. In this case, the components corresponding to reference numerals 15, 27, 28, and 52 may be omitted from the configuration of FIG. 1, and the CPU 14 may function as a wireless synchronization signal generating unit. In this case, when the light projecting / receiving operation for detection is performed, for example, an optical signal having the first pulse interval is transmitted from the light projecting element 11 for detection, and this is performed during transmission / reception of the synchronization signal. It is only necessary to transmit optical signals having an interval larger than the first pulse interval so that they can be distinguished on the light receiving side.
(4) In the related technique and the embodiment described above, the example in which the wired synchronization signal generation unit 51 and the wireless synchronization signal generation unit 52 are provided in the projector 10 is shown, but these may be provided on the light receiver 20 side. For example, when the optical synchronization method is used, a light projection operation for light synchronization may be performed from the light receiver 20 side, and a light reception operation for light synchronization may be performed on the light projector 10 side. Also, when the line synchronization method is used, a synchronization signal may be output from the light receiver 20 side and acquired by the CPU 14 on the projector 10 side.

The block diagram which shows notionally the multi-optical axis photoelectric sensor which concerns on the related technology 1 of this invention Explanatory drawing explaining the case where a connector for wireless synchronization is connected to a shared connector 1 is a block diagram illustrating a case where a synchronization line is used for the multi-optical axis photoelectric sensor of FIG. Explanatory drawing explaining the case where a wired synchronization connector is connected to a shared connector The flowchart which illustrates about the case where it switches based on the identification signal of an optical synchronous system Flowchart illustrating the case of switching based on an optical synchronization method synchronization signal The figure which shows the example which made the optical axis of the light projecting / receiving operation for detection common with the optical axis of the light projecting / receiving operation of the synchronization signal The figure which shows the example at the time of providing a wired-type synchronous signal production | generation means and a wireless-type synchronous signal production | generation means on the connector side The figure which shows the example switched to the connector different from FIG.

DESCRIPTION OF SYMBOLS 1 ... Multi-optical axis photoelectric sensor 10 ... Light projector 11 ... Light projection element for detection (light projection element)
14 ... Projection side CPU (projection control means, switching means, discrimination means)
20 ... Light receiver 21 ... Light receiving element for detection (light receiving element)
24. Light receiving side CPU (light shielding detection means, confirmation means)
DESCRIPTION OF SYMBOLS 40 ... Synchronization line 51 ... Wired synchronization signal generation means 52 ... Wireless synchronization signal generation means 60 ... Wired synchronization connector 61 ... Wireless synchronization connector 70 ... Shared connector 72 ... Discrimination terminal

Claims (7)

A projector having a plurality of projector elements;
A light receiver including a plurality of light receiving elements arranged in pairs to form each optical element and an optical axis;
Projection control means for controlling the projection timing of each projection element;
A light-blocking detecting means for detecting a light-blocking state on the optical axis by detecting a light-receiving signal from each light-receiving element in synchronization with a light-projecting timing of the light-projecting element that forms the optical axis facing each light-receiving element. When,
The projector and the light receiver are connected by a synchronization line, a wired synchronization signal generating means for generating a wired synchronization signal used when transmitting and receiving a synchronization signal via the synchronization line, the projector and the light receiver and switching means for switching a wireless synchronization signal generating means for generating a wireless synchronization signal used when sending and receiving the synchronization signal by radio between the,
A common connector that can alternatively connect a wired synchronization connector to which the synchronization line is connected and a wireless synchronization connector used in a wireless system,
Determining means for determining whether one of the wired synchronization connector and the wireless synchronization connector is connected to the shared connector;
The switching unit switches between the wired synchronization signal generation unit and the wireless synchronization signal generation unit based on the determination result of the determination unit,
When switched to the wireless synchronization signal generation means, the wireless synchronization signal generation means, the detection optical signal during the detection light projecting and receiving operation, the wireless synchronization signal during the transmission and reception of the synchronization signal, A multi- optical axis characterized by being output as signals having different pulse intervals from each other, transmitted from at least one of the light projecting elements in the light projector, and received by the light receiving element constituting the light projecting element and the optical axis Photoelectric sensor. The shared connector has a determination terminal in which the voltage level when the wired synchronization connector is connected and the voltage level when the wireless synchronization connector is connected are different,
2. The multi-optical axis photoelectric sensor according to claim 1 , wherein the determination unit switches between the wired synchronization signal generation unit and the wireless synchronization signal generation unit based on a voltage level of the determination terminal. A projector having a plurality of projector elements;
A light receiver including a plurality of light receiving elements arranged in pairs to form an optical axis with each light receiving element;
Projection control means for controlling the projection timing of each projection element;
A light-blocking detecting means for detecting a light-blocking state on the optical axis by detecting a light-receiving signal from each light-receiving element in synchronization with a light-projecting timing of the light-projecting element that forms the optical axis facing each light-receiving element. When,
With
Wired synchronization signal generating means for connecting the projector and the light receiver with a synchronization line and generating a wired synchronization signal used when transmitting / receiving a synchronization signal via the synchronization line, the projector and the light receiver a wireless synchronization signal generating means for generating a wireless synchronization signal used when sending and receiving the synchronization signal by radio between the, is configured to be selectively attached and detached,
When switched to the wireless synchronization signal generation means, the wireless synchronization signal generation means, the detection optical signal during the detection light projecting and receiving operation, the wireless synchronization signal during the transmission and reception of the synchronization signal, A multi- optical axis characterized by being output as signals having different pulse intervals from each other, transmitted from at least one of the light projecting elements in the light projector, and received by the light receiving element constituting the light projecting element and the optical axis Photoelectric sensor. A plurality of light projecting elements arranged in pairs with each other to form an optical axis with a plurality of light receiving elements provided in the light receiver;
Projection control means for controlling the projection timing of each projection element;
With
Detects a light-blocking state on the optical axis by detecting a light reception signal from each light-receiving element of the light receiver in synchronization with the light projection timing of the light-projecting element that forms the optical axis facing each light-receiving element. A projector used in a multi-optical axis photoelectric sensor provided with a light-shielding detection means for
The projector and the light receiver are connected by a synchronization line, a wired synchronization signal generating means for generating a wired synchronization signal used when transmitting and receiving a synchronization signal via the synchronization line, the projector and the light receiver and switching means for switching a wireless synchronization signal generating means for generating a wireless synchronization signal used when sending and receiving the synchronization signal by radio between the,
A common connector that can alternatively connect a wired synchronization connector to which the synchronization line is connected and a wireless synchronization connector used in a wireless system,
Determining means for determining whether one of the wired synchronization connector and the wireless synchronization connector is connected to the shared connector;
When switched to the wireless synchronization signal generation means, the wireless synchronization signal generation means, the detection optical signal during the detection light projecting and receiving operation, the wireless synchronization signal during the transmission and reception of the synchronization signal, projector, wherein Rukoto is transmitted from at least one of the light emitting element in the projector and output as pulse interval different signals from each other. A plurality of light projecting elements arranged in pairs with each other to form an optical axis with a plurality of light receiving elements provided in the light receiver;
Projection control means for controlling the projection timing of each projection element;
Have
A light-blocking detecting means for detecting a light-blocking state on the optical axis by detecting a light-receiving signal from each light-receiving element in synchronization with a light-projecting timing of the light-projecting element that forms the optical axis facing each light-receiving element. A projector for use in a multi-optical axis photoelectric sensor comprising:
Wired synchronization signal generating means for connecting the projector and the light receiver with a synchronization line and generating a wired synchronization signal for use in transmitting and receiving a synchronization signal via the synchronization line, the projector and the light receiver a wireless synchronization signal generating means for generating a wireless synchronization signal used when sending and receiving the synchronization signal by radio between the, is configured to be selectively attached and detached,
When switched to the wireless synchronization signal generation means, the wireless synchronization signal generation means, the detection optical signal during the detection light projecting and receiving operation, the wireless synchronization signal during the transmission and reception of the synchronization signal, projector, wherein Rukoto is transmitted from at least one of the light emitting element in the projector and output as pulse interval different signals from each other. A plurality of light receiving elements arranged in pairs so as to form an optical axis with each light receiving element in a projector provided with a plurality of light projecting elements,
The light projection control means for controlling the light projection timing of each light projecting element of the light projector, and the light projection timing of the light projecting element that forms the optical axis of the light receiving signal from each light receiving element facing each light receiving element. A light-receiving detector used for a multi-optical axis photoelectric sensor, comprising:
The projector and the light receiver are connected by a synchronization line, a wired synchronization signal generating means for generating a wired synchronization signal used when transmitting and receiving a synchronization signal via the synchronization line, the projector and the light receiver and switching means for switching a wireless synchronization signal generating means for generating a wireless synchronization signal used when sending and receiving the synchronization signal by radio between the,
A common connector that can alternatively connect a wired synchronization connector to which the synchronization line is connected and a wireless synchronization connector used in a wireless system,
Determining means for determining whether one of the wired synchronization connector and the wireless synchronization connector is connected to the shared connector;
The switching unit switches between the wired synchronization signal generation unit and the wireless synchronization signal generation unit based on the determination result of the determination unit,
When switched to the wireless synchronization signal generation means, the wireless synchronization signal generation means, the detection optical signal during the detection light projecting and receiving operation, the wireless synchronization signal during the transmission and reception of the synchronization signal, A light receiving device, wherein the light receiving devices are respectively output as signals having different pulse intervals, transmitted from at least one light projecting device of the light projecting device, and received by the light receiving device constituting the light projecting device and the optical axis . A plurality of light receiving elements arranged in pairs so as to form an optical axis with each light receiving element in a projector provided with a plurality of light projecting elements,
The light projection control means for controlling the light projection timing of each light projecting element of the light projector, and the light projection timing of the light projecting element that forms the optical axis of the light receiving signal from each light receiving element facing each light receiving element. A light-receiving detector used for a multi-optical axis photoelectric sensor, comprising:
Wired synchronization signal generating means for connecting the projector and the light receiver with a synchronization line and generating a wired synchronization signal for use in transmitting and receiving a synchronization signal via the synchronization line, the projector and the light receiver a wireless synchronization signal generating means for generating a wireless synchronization signal used when sending and receiving the synchronization signal by radio between the, is configured to be selectively attached and detached,
When switched to the wireless synchronization signal generation means, the wireless synchronization signal generation means, the detection optical signal during the detection light projecting and receiving operation, the wireless synchronization signal during the transmission and reception of the synchronization signal, A light receiving device, wherein the light receiving devices are respectively output as signals having different pulse intervals, transmitted from at least one light projecting device of the light projecting device, and received by the light receiving device constituting the light projecting device and the optical axis .

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