JP2010140914A - Photoelectric switch, and method of detecting object using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photoelectric switch capable of easily and accurately adjusting a value related to processing of a received light signal and also capable of easily recognizing the value. <P>SOLUTION: A light projecting and receiving portion 20 is provided on the front part 14 of the casing of a photoelectric switch 1, and a display portion 30 and a push-type adjusting switch 50 are provided on the back part 13. A push-type selecting/determining/setting switch 40 and an indicating lamp 60 are provided on one end face 11 of the casing 10. An output cable 70 is connected to a corner part between the back part 13 and the other end face part 12 of the casing. The selecting/determining/setting switch 40 is used for selecting operation to select the kind of information to be displayed on the display portion 30, for determining operation of a set value, and for setting operation of the set value. The adjusting switch 50 is used for adjusting the value of information displayed on the display portion 30. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a photoelectric switch that detects the presence or absence of an object in a predetermined detection region.

Conventionally, a photoelectric switch has been used to detect the presence or absence of an object in a production line of a factory. The photoelectric switch projects the light onto the detection area of the object and receives the return light from the object, thereby determining the presence or absence of the object.

As one of such photoelectric switches, a triangulation photoelectric switch that applies the principle of triangulation has been developed. The triangulation photoelectric switch is called a distance setting type photoelectric switch.

FIG. 16 is a schematic diagram showing the configuration of the main part of a conventional triangulation photoelectric switch.

In FIG. 16, the photoelectric switch 800 includes a light emitting diode 801, a light projecting lens 802, a light receiving lens 803, and a PSD (light position detecting element) 804. The light emitted from the light emitting diode 801 is irradiated to the detection object 900 through the light projection lens 802. The reflected light from the detection object 900 is received by the PSD 804 through the light receiving lens 803. As a result, a light spot is formed on the light receiving surface of the PSD 804.

The position of the light spot on the light receiving surface of the PSD 804 changes depending on the distance between the photoelectric switch 800 and the detection object 900. When the detection object 900 approaches the photoelectric switch 800, a light spot is formed on the one end e1 side of the light receiving surface of the PSD 804, and when the detection object 900 moves away from the photoelectric switch 800, the light spot is another on the light receiving surface of the PSD 804. It is formed on the end e2 side.

The PSD 804 outputs two light reception signals N and F corresponding to the position of the light spot on the light receiving surface. One light reception signal N has a level (current value) substantially proportional to the distance from one end e1 of the light receiving surface of PSD 804 to the light spot, and the other light reception signal F is from the other end e2 of the light receiving surface to the light spot. It has a level (current value) approximately proportional to the distance. Therefore, the distance from the photoelectric switch 800 to the detection object 900 can be detected using the two light reception signals N and F.

On the optical axis of the projection light from the light emitting diode 801, a range in which the reflected light from the detection target can enter the light receiving surface of the PSD 804 is a detection region. A set position ST is set in advance in the detection area, and a side closer to the photoelectric switch 800 with respect to the set position ST becomes a detectable range, and a side away from the photoelectric switch 800 with respect to the set position ST becomes a non-detection range. The photoelectric switch 800 determines that the detection target 900 exists when the PSD 804 receives reflected light from the detectable range.

FIG. 17 is a diagram for explaining determination processing using the light reception signals N and F output from the PSD 804. A difference (N−F) between the light reception signal N and the light reception signal F corresponds to the position of the detection object 900 in the detection region. In actual processing, normalization is performed by dividing the difference (NF) of the received light signal by (N + F) corresponding to the total received light amount, and the position signal {(NF) / (N + F)} is obtained.

As shown in FIG. 17A, when the level of the position signal is higher than a preset threshold value TH, it is determined that the detection target 900 exists within the detectable range, and shown in FIG. As described above, when the level of the position signal is lower than the threshold value TH, it is determined that the detection target 900 does not exist within the detectable range. By adjusting the threshold value TH, the set position ST in the detection area can be moved.

FIG. 18 is a schematic diagram for explaining a threshold value setting method in a conventional photoelectric switch. The photoelectric switch 800 is provided with a trimmer switch 810 for adjusting a threshold value, a detection indicator lamp 811 that displays a detection result, and a stability indicator lamp 812 that indicates the stability of detection.

First, as shown in FIG. 18A, the detection object 900 is arranged at a predetermined position in front of the photoelectric switch 800, and the trimmer switch 810 is turned to the right until the detection indicator lamp 811 is turned on.

Next, as shown in FIG. 18B, the detection target 900 is removed, and the trimmer switch 810 is further rotated to the right until the detection indicator lamp 811 is turned on in a state where light is projected onto the background object 901. When there is no background object 901, the trimmer switch 810 is set to the maximum position.

Further, as shown in FIG. 18C, the trimmer switch 810 is returned to the left, and is set to an intermediate position between the position of FIG. 18A and the position of FIG. Thereby, the set position ST is set in the middle between the position of the detection target 900 and the position of the background object 901.

In this state, when the detection object 900 is present, the detection indicator lamp 811 and the stability indicator lamp 812 are turned on. When the detection object 900 is not present, the detection indicator lamp 811 is turned off and the stability indicator lamp 812 is turned on. Check that it lights up. When the stability indicator lamp 812 is not turned on, readjustment is performed because the margin between the set position ST and the position of the detection target 900 or between the set position ST and the background object 901 is small.

As described above, in the conventional photoelectric switch 800, the set position ST is set and adjusted by turning the trimmer switch 810 while looking at the detection indicator lamp 811 and the stability indicator lamp 812. It cannot be accurately grasped, and it is difficult to finely adjust the set position ST. It is also difficult to grasp the margin between the detection object 900 and the set position ST and the margin between the set position ST and the background object 901.

An object of the present invention is to provide a photoelectric switch that can easily and accurately adjust a value related to processing of a received light signal and can easily recognize the value.

(1) First Invention A photoelectric switch according to the first invention is a photoelectric switch that detects the presence or absence of an object in the detection region by projecting light to the detection region and receiving feedback light from the detection region. A casing having at least a light receiving means for outputting a light receiving signal corresponding to the light receiving state of the feedback light from the detection region, a casing having a plurality of outer surfaces, a processing means for processing the light receiving signal output from the light receiving means, and the casing Provided on any one of the plurality of outer surfaces, a display unit capable of switching and displaying a plurality of types of values related to the processing of the processing unit, and a first outer surface of the plurality of outer surfaces of the casing, which are displayed on the display unit. An adjustment means for adjusting the measured value in the processing means, and a second outer surface different from the first outer surface among the plurality of outer surfaces of the casing. Is obtained by a selection means for selecting the type of values to be displayed on the display unit among a plurality of types of values related.

In the photoelectric switch according to the present invention, a light receiving signal corresponding to the light receiving state of the feedback light from the detection region is output by the light receiving means, and the light receiving signal is processed by the processing means. In addition, a plurality of types of values relating to the processing of the processing means are switched and displayed on the display means.

The user can select the type of the value to be displayed on the display unit from among a plurality of types of values related to the processing unit using the selection unit, and process the adjustable value displayed on the display unit using the adjustment unit. It can be adjusted in the means.

In this case, since the adjusting means and the selecting means are provided on different outer surfaces of the casing, erroneous operation of the adjusting means and the selecting means is prevented. In addition, since the value can be adjusted while observing the value displayed on the display means, it is possible to easily and accurately adjust the value relating to the processing of the received light signal and to easily recognize the value. Can do.

(2) Second invention A photoelectric switch according to the second invention is a photoelectric switch that detects the presence or absence of an object in the detection region by projecting light to the detection region and receiving feedback light from the detection region. A casing having at least a light receiving means for outputting a light receiving signal corresponding to the light receiving state of the feedback light from the detection region, a casing having a plurality of outer surfaces, a processing means for processing the light receiving signal output from the light receiving means, and the casing A display means provided on any one of the plurality of outer surfaces and capable of displaying an adjustable value for detecting the presence or absence of an object with respect to the processing of the processing means, and a first outer surface of the plurality of outer surfaces of the casing An adjusting means for adjusting an adjustable value displayed on the display means and a second outer surface different from the first outer surface among the plurality of outer surfaces of the casing; It is, in which a determination means for determining a value related to the processing of the processing means an adjusted value by adjusting means.

In the photoelectric switch according to the present invention, a light receiving signal corresponding to the light receiving state of the feedback light from the detection region is output by the light receiving means, and the light receiving signal is processed by the processing means. Further, a value that can be adjusted to detect the presence or absence of an object as well as the processing of the processing means is displayed on the display means.

The user can adjust the value displayed on the display unit using the adjusting unit, and can determine the value adjusted by the adjusting unit using the determining unit as a value related to the processing of the processing unit.

In this case, since the adjusting means and the determining means are provided on different outer surfaces of the casing, erroneous operation of the adjusting means and the determining means is prevented. In addition, since the value can be adjusted while observing the value displayed on the display means, it is possible to easily and accurately adjust the value relating to the processing of the received light signal and to easily recognize the value. Can do.

(3) Third invention A photoelectric switch according to the third invention is configured such that in the configuration of the photoelectric switch according to the second invention, the display means can switch and display a plurality of types of values related to the processing of the processing means. Is.

In this case, the user can easily recognize a plurality of types of values related to the processing of the processing means by the display means.

(4) Fourth Invention A photoelectric switch according to the fourth invention is a photoelectric switch that detects the presence or absence of an object in the detection region by projecting light to the detection region and receiving feedback light from the detection region. A casing having at least a light receiving means for outputting a light receiving signal corresponding to the light receiving state of the feedback light from the detection region, a casing having a plurality of outer surfaces, a processing means for processing the light receiving signal output from the light receiving means, and the casing Setting means for setting a value that is provided on the second outer surface of the plurality of outer surfaces and that is generated based on the processing of the processing means and that is adjustable to detect the presence or absence of an object, as a value related to processing of the processing means A display means provided on any one of the plurality of outer surfaces of the casing and capable of displaying an adjustable value set by the setting means, and a plurality of casings Provided on the first outer surface different from the second outer surface of the face, in which an adjusting means for adjusting the processing means adjustable value displayed on the display unit.

In the photoelectric switch according to the present invention, a light receiving signal corresponding to the light receiving state of the feedback light from the detection region is output by the light receiving means, and the light receiving signal is processed by the processing means.

The user can set a value generated based on the processing of the processing unit and adjustable to detect the presence or absence of an object as a value related to the processing of the processing unit using the setting unit. The adjustable value set by the setting means is displayed on the display means. The user can adjust the adjustable value displayed on the display unit using the adjustment unit.

In this case, since the adjusting means and the setting means are provided on different outer surfaces of the casing, erroneous operation of the adjusting means and the setting means is prevented. In addition, since the value can be adjusted while observing the value displayed on the display means, it is possible to easily and accurately adjust the value relating to the processing of the received light signal and to easily recognize the value. Can do.

(5) Fifth Invention According to a fifth aspect of the photoelectric switch, in the configuration of the photoelectric switch according to the fourth invention, the display means is configured to be able to switch and display a plurality of types of values related to the processing of the processing means. Is.

In this case, the user can easily recognize a plurality of types of values related to the processing of the processing means by the display means.

(6) Sixth Invention A photoelectric switch according to a sixth invention is the photoelectric switch according to any one of the first to fifth inventions, wherein the display means is provided on the first outer surface of the casing and is adjusted. The value adjusted by the means is displayed as a number.

In this case, since the display means is provided on the same outer surface as the adjustment means of the casing, it is possible to adjust the value more easily and accurately by the adjustment means while observing the value displayed numerically on the display means. At the same time, the value can be recognized more easily.

(7) Seventh Invention A photoelectric switch according to a seventh invention is the photoelectric switch according to the sixth invention, wherein the casing has a processing means built therein, and the processing means receives the light reception signal output from the light receiving means. The detection process is performed to detect the presence or absence of an object in the detection region, and information regarding the detection state is output via an output line, and the output line extends to the outside of the casing from a portion different from the second outer surface of the casing. Is.

In this case, detection processing for detecting the presence or absence of an object in the detection region is performed by processing the light reception signal in the processing means, and information on the detection state is output via the output line. In particular, since the output line extends to the outside of the casing from a portion different from the second outer surface provided with the casing selection means, determination means or setting means, the size of the selection means, determination means or setting means is ensured. It is possible to prevent the output line from interfering with the operation of the selection means, the determination means or the setting means.

(8) Eighth Invention The photoelectric switch according to the eighth invention is the configuration of the photoelectric switch according to the seventh invention, wherein the output line is formed between the outer surface facing the second outer surface of the casing and the first outer surface. It extends outside the casing from the corners between them.

In this case, it is possible to prevent the output line from interfering with the operation of the first outer surface adjusting means and the second outer surface selecting means, determining means, or setting means.

(9) Ninth Invention A photoelectric switch according to the ninth invention is provided on the second outer surface of the casing in the configuration of the photoelectric switch according to the seventh or eighth invention, and includes information relating to the detection state of the processing means. A display unit for displaying is further provided.

In this case, since the display unit is provided on the same outer surface as the casing selection unit, determination unit, or setting unit, the selection unit, determination unit, or setting unit is operated while viewing information on the detection state displayed on the display unit. be able to.

(10) Tenth Invention A photoelectric switch according to a tenth invention is a photoelectric switch that detects the presence or absence of an object in the detection region by projecting light to the detection region and receiving feedback light from the detection region. The light receiving means for outputting a light receiving signal corresponding to the light receiving state of the feedback light from the detection area, and at least one of the casing having a plurality of outer surfaces and the plurality of outer surfaces of the casing; A display means capable of switching and displaying a plurality of types of values generated based on the received light signal, and a selection for selecting a type of value to be displayed on the display means provided on the second outer surface of the plurality of outer surfaces of the casing And a first outer surface different from the second outer surface among the plurality of outer surfaces of the casing and displayed on the display means by being selected by the selection means. The value is obtained by an adjusting means for adjusting.

In the photoelectric switch according to the present invention, the light receiving means outputs a light receiving signal corresponding to the light receiving state of the feedback light from the detection region, and a plurality of types of values generated based on the light receiving signal are switched and displayed on the display means.

The user can select the type of value to be displayed on the display unit using the selection unit, and can adjust the value displayed on the display unit using the adjustment unit.

In this case, since the value can be adjusted while viewing the value displayed on the display means, the value displayed on the display means can be adjusted easily and accurately, and the value can be easily recognized. can do.

(11) Eleventh invention A photoelectric switch according to an eleventh invention is a photoelectric switch for detecting the presence or absence of an object in the detection region by projecting light to the detection region and receiving feedback light from the detection region. A light receiving means for outputting a light receiving signal corresponding to the light receiving state of the return light from the detection area, a casing having a plurality of outer surfaces, a processing means for processing the light receiving signal output from the light receiving means, and a processing A storage unit for storing a value generated by the means, and a display means provided on any one of the plurality of outer surfaces of the casing and capable of displaying an adjustable value for detecting the presence or absence of an object as well as processing of the processing means An adjusting means for adjusting an adjustable value displayed on the display means and provided on the first outer surface of the plurality of outer surfaces of the casing; And a determination unit that is provided on a second outer surface different from the first outer surface of the plurality of outer surfaces, and that determines to store the value adjusted by the adjustment unit as a reference value in the storage unit. .

In the photoelectric switch according to the present invention, a light receiving signal corresponding to the light receiving state of the feedback light from the detection region is output by the light receiving means, and the light receiving signal is processed by the processing means. Then, the value generated by the processing means is stored in the storage unit. Further, a value that can be adjusted to detect the presence or absence of an object as well as the processing of the processing means is displayed on the display means.

The user can adjust the adjustable value displayed on the display unit using the adjusting unit, and can store the value adjusted by the adjusting unit using the determining unit as a reference value in the storage unit. .

In this case, since the adjusting means and the determining means are provided on different outer surfaces of the casing, erroneous operation of the adjusting means and the determining means is prevented. In addition, since the value can be adjusted while viewing the value displayed on the display means, the reference value stored in the storage unit can be easily and accurately adjusted, and the value can be easily recognized. be able to.

(12) Twelfth Invention In the photoelectric switch according to the twelfth invention, in the configuration of the photoelectric switch according to the eleventh invention, the display means switches a plurality of types of values generated based on the light reception signal from the light reception means. It is configured to be displayable.

In this case, the user can easily recognize the value generated based on the light reception signal from the light receiving means by the display means.

(13) Thirteenth invention A photoelectric switch according to a thirteenth invention is provided on the second outer surface of the plurality of outer surfaces of the casing in the configuration of the photoelectric switch according to the third or twelfth invention, and is used as a display means. It further includes selection means for selecting the type of value to be displayed.

In this case, the user can select the type of value to be displayed on the display unit using the selection unit. In particular, since the selection means is provided on an outer surface different from the adjustment means of the casing, erroneous operation of the selection means and the adjustment means is prevented.

(14) Fourteenth Invention In the photoelectric switch according to the fourteenth invention, in the configuration of the photoelectric switch according to the thirteenth invention, the determining means and the selecting means are constituted by common means.

Thereby, the size of the determination means and the selection means can be ensured while reducing the size of the casing, and the operability is improved.

(15) Fifteenth Invention A photoelectric switch according to the fifteenth invention is a photoelectric switch that detects the presence or absence of an object in the detection region by projecting light to the detection region and receiving feedback light from the detection region. A light receiving means for outputting a light receiving signal corresponding to the light receiving state of the return light from the detection area, a casing having a plurality of outer surfaces, a processing means for processing the light receiving signal output from the light receiving means, and a processing A storage unit for storing values generated by the means, and a value provided on the second outer surface of the plurality of outer surfaces of the casing, and generated based on the processing of the processing means and adjustable to detect the presence or absence of an object Is set in any one of a plurality of outer surfaces of the casing, and is set in the storage unit by the setting unit. For adjusting the adjustable value displayed on the display means provided on the first outer surface different from the second outer surface among the plurality of outer surfaces of the casing and the display means capable of displaying the memorized adjustable value Adjustment means.

In the photoelectric switch according to the present invention, a light receiving signal corresponding to the light receiving state of the feedback light from the detection region is output by the light receiving means, and the light receiving signal is processed by the processing means. Then, the value generated by the processing means is stored in the storage unit.

The user can store a value generated based on the processing of the processing unit and adjustable to detect the presence or absence of an object in the storage unit as a reference value using the setting unit. The adjustable value stored in the storage unit is displayed on the display means. The user can adjust the adjustable value displayed on the display unit using the adjustment unit.

In this case, since the adjusting means and the setting means are provided on different outer surfaces of the casing, erroneous operation of the adjusting means and the setting means is prevented. In addition, since the value can be adjusted while viewing the value displayed on the display means, the reference value stored in the storage unit can be easily and accurately adjusted, and the value can be easily recognized. be able to.

(16) Sixteenth Invention In the photoelectric switch according to the sixteenth invention, in the configuration of the photoelectric switch according to the fifteenth invention, the display means can switch and display the value generated based on the light receiving signal from the light receiving means. It is configured.

In this case, the user can easily recognize the value generated based on the light reception signal from the light receiving means by the display means.

(17) Seventeenth Invention The photoelectric switch according to the seventeenth invention is provided on the second outer surface of the plurality of outer surfaces of the casing in the configuration of the photoelectric switch according to the fifth or sixteenth invention, and is used as a display means. It further includes selection means for selecting the type of value to be displayed.

In this case, the user can select the type of value to be displayed on the display unit using the selection unit. In particular, since the selection means is provided on an outer surface different from the adjustment means of the casing, erroneous operation of the selection means and the adjustment means is prevented.

(18) Eighteenth Invention A photoelectric switch according to an eighteenth aspect of the invention is the photoelectric switch according to the seventeenth aspect of the invention, wherein the setting means and the selection means are constituted by common means.

Thereby, the size of the setting means and the selection means can be secured while reducing the size of the casing, and the operability is improved.

(19) Nineteenth Invention A photoelectric switch according to a nineteenth invention is the photoelectric switch according to any one of the tenth to eighteenth inventions, wherein the display means is provided on the first outer surface.

In this case, since the display means is provided on the same outer surface as the casing adjustment means, the value can be easily and accurately adjusted while observing the value displayed on the display means, and the value is easily recognized. can do.

(20) Twentieth invention A photoelectric switch according to a twentieth invention is the photoelectric switch according to any one of the tenth to nineteenth inventions, wherein the first and second outer surfaces of the plurality of outer surfaces of the casing are A light receiving portion provided on a different third outer surface and further receiving the return light from the detection region and supplying the light to the light receiving means is further provided.

In this case, the adjusting means, selecting means, determining means or setting means are provided on the outer surface different from the light receiving part of the casing, so that the size of the adjusting means, selecting means, determining means or setting means is ensured while the casing is downsized. And the operability is improved.

(21) Twenty-first invention A photoelectric switch according to a twenty-first invention is a photoelectric switch for detecting the presence or absence of an object in the detection region by projecting light to the detection region and receiving feedback light from the detection region. A casing having at least a light receiving means for outputting a light receiving signal corresponding to the light receiving state of the feedback light from the detection region, a casing having a plurality of outer surfaces, a processing means for processing the light receiving signal output from the light receiving means, and the casing The display means provided on the first outer surface of the plurality of outer faces and a value relating to the processing of the processing means, and the value provided on the first outer face of the casing and displayed on the display means are adjusted by the processing means. Adjustment means, adjustment means, and sealing means for sealing between the casing.

In the photoelectric switch according to the present invention, a light receiving signal corresponding to the light receiving state of the feedback light from the detection region is output by the light receiving means, and the light receiving signal is processed by the processing means. Further, a value related to the processing of the processing means is displayed on the display means. The user can adjust the value displayed on the display means using the adjusting means on the processing means.

Since the display means and the adjustment means are provided on the same outer surface of the casing, it is possible to easily and accurately adjust the value relating to the processing by the adjustment means while watching the value displayed on the display means, The value can be easily recognized. Further, since the space between the adjusting means and the casing is sealed by the sealing means, the airtightness in the casing is ensured.

(22) Twenty-second Invention A photoelectric switch according to a twenty-second invention is the photoelectric switch according to the twenty-first invention, wherein the adjusting means comprises a push-type switch.

As a result, the display area of the display means can be sufficiently secured while the casing is downsized, and the operability of the adjustment means can be improved.

(23) Twenty-third Invention A photoelectric switch according to a twenty-third invention is the photoelectric switch according to the twenty-second invention, wherein the casing has a switch mounting hole on the first outer surface, and the push-type switch is pressed. The sealing means includes an annular seal member integrally provided around the pressing member via a thin portion, and the pressing member is inserted into the switch mounting hole of the casing, and the annular sealing member is the casing. It is closely attached to the inside.

In this case, the space between the pressing switch and the casing is sealed by the annular sealing member around the pressing member. As a result, the display area of the display means can be sufficiently secured while maintaining a simple seal structure and the casing being downsized, the operability of the adjustment means can be improved, and the airtightness of the casing Can be secured.

(24) Twenty-fourth Invention The photoelectric switch according to the twenty-fourth invention is the configuration of the photoelectric switch according to any of the twenty-first to twenty-third inventions, wherein the display means switches a plurality of types of values relating to the processing of the processing means. In order to select a type of value to be displayed on the display unit from among a plurality of types related to the processing of the processing unit, provided on a second outer surface different from the first outer surface among the plurality of outer surfaces of the casing. The casing further includes a light emitting means for generating light, and light generated by the light emitting means on a third outer surface different from the first and second outer surfaces of the plurality of outer surfaces of the casing. And a light projecting / receiving unit that receives feedback light from the detection region and guides it to the light receiving device. In this case, the light generated by the light emitting means is projected to the detection area through the light projecting / receiving part, and the feedback light from the detection area is guided to the light receiving means through the light projecting / receiving part. The user can select a value type to be displayed on the display means among a plurality of kinds of values related to the processing of the processing means by using the selection means. Since the selection means is provided on the outer surface different from the adjustment means of the casing, erroneous operation of the selection means and the adjustment means is prevented.

(25) Twenty-fifth aspect The photoelectric switch according to the twenty-fifth aspect of the invention is the photoelectric switch according to the twenty-fourth aspect of the invention, wherein the selection means comprises a push switch. In this case, the operability of the selection means can be improved while reducing the size of the casing.

  As described above, according to the present invention, it is possible to easily and accurately adjust the value relating to the processing of the received light signal and to easily recognize the value.

It is the external appearance perspective view which looked at the photoelectric switch of the triangulation system in one Example of this invention from one direction. It is the external appearance perspective view which looked at the photoelectric switch of FIG. 1 from the other direction. It is a block diagram which shows the structure of the photoelectric switch of FIG. It is a schematic diagram for demonstrating position information and threshold value information. It is a figure which shows the display part and indicator lamp in the photoelectric switch of FIG. It is a schematic diagram which shows the specific example of setting operation by the selection / decision / setting switch in the photoelectric switch of FIG. It is a schematic diagram which shows the specific example of setting operation by the selection / decision / setting switch in the photoelectric switch of FIG. It is a schematic diagram which shows the specific example of setting operation by the selection / decision / setting switch in the photoelectric switch of FIG. It is sectional drawing of a direction parallel to the side part of the photoelectric switch of FIG. It is sectional drawing of the direction parallel to the end surface part of the photoelectric switch of FIG. FIG. 2 is an exploded perspective view of a part of the photoelectric switch of FIG. 1. It is a schematic diagram which shows the other example of a selection / decision / setting switch. It is a figure which shows the selection switch and decision switch which were provided independently, respectively. It is an external appearance perspective view of the photoelectric switch of the triangulation system in the other Example of this invention. It is a perspective view which shows the usage example of the photoelectric switch of FIG. It is a schematic diagram which shows the structure of the principal part of the conventional triangulation system photoelectric switch. It is a figure for demonstrating the determination process using the light reception signal output from PSD. It is a schematic diagram for demonstrating the setting method of the threshold value in the conventional photoelectric switch.

FIG. 1 is an external perspective view of a triangulation type photoelectric switch in one embodiment of the present invention as seen from one direction, and FIG. 2 is an external perspective view of the photoelectric switch in FIG.

1 and 2, the casing 10 is formed in a rectangular parallelepiped shape having end surface portions 11 and 12 facing each other, a back surface portion 13 and a front surface portion 14 facing each other, and side surface portions 15 and 16 facing each other. Has been. For example, the longitudinal length L of the casing 10 is 30 mm, the lateral length D is 20 mm, and the width W is 10.8 mm.

As shown in FIG. 2, the front surface portion 14 of the casing 10 is provided with a light projecting / receiving unit 20 that projects light onto the detection region and receives feedback light from the detection region. As shown in FIG. 1, a display unit 30 and two push-type adjustment switches 50 are provided on the back surface portion 13 of the casing 10. A push type selection / decision / setting switch 40 and an indicator lamp 60 are provided on one end surface portion 11 of the casing 10. An output cable 70 is connected to a corner between the back surface portion 13 and the other end surface portion 12 of the casing 10. The side surface portions 15 and 16 of the casing 10 are used for fixing the photoelectric switch 1.

FIG. 3 is a block diagram showing the configuration of the photoelectric switch of FIG. As shown in FIG. 3, the photoelectric switch 1 includes a light projecting lens 21, an LED (light emitting diode) 22, a light receiving lens 23, a PSD (light position detecting element) 24, a control circuit 81, amplifiers 82 and 83, and an LED (light emitting diode). A drive circuit 84, a display unit 30, a selection / decision / setting switch 40, an adjustment switch 50 and an indicator lamp 60 are provided. The control circuit 81 includes a memory 88.

The light projecting lens 21 and the light receiving lens 23 constitute the light projecting / receiving unit 20. Further, the LED 22, PSD 24, control circuit 81, amplifiers 82 and 83, and LED drive circuit 84 are built in the casing 10 of FIG.

The LED drive circuit 84 drives the LED 22 under the control of the control circuit 81. Thereby, the LED 22 emits light. The light emitted from the LED 22 is projected onto the detection object 500 in the detection region through the light projecting lens 21. The reflected light from the detection object 500 is received as a light spot on the light receiving surface of the PSD 24 through the light receiving lens 23.

The PSD 24 outputs two light reception signals N and F corresponding to the position of the light spot on the light receiving surface. One light reception signal N has a level (current value) substantially proportional to the distance from one end e1 of the light receiving surface of the PSD 24 to the light spot, and the other light reception signal F is from the other end e2 of the light receiving surface to the light spot. It has a level (current value) approximately proportional to the distance. The received light signals E and F output from the PSD 24 are given to the control circuit 81 via amplifiers 82 and 83, respectively.

As described with reference to FIG. 17, the control circuit 81 performs a determination process using the light reception signals N and F and a preset threshold value. That is, the control circuit 81 calculates the position signal {(NF) / (N + F)} based on the light reception signals N and F corresponding to the current position of the light spot on the light receiving surface of the PSD 24, and the position The presence / absence of the detection object 500 in the detection region is detected by comparing the value of the signal with a threshold value.

The control circuit 81 displays the detection result and detection stability on the indicator lamp 60 and outputs a detection signal DT indicating the detection result to the outside through the output cable 70. Here, a case where it is determined that a detection target exists within the detectable range of the detection area is referred to as an on state, and a case where it is determined that there is no detection target within the detectable range of the detection area is referred to as an off state. The detection stability is expressed by the difference between the position signal value and the threshold value when the detection target exists or does not exist within the detectable range of the detection region, and when the difference is a predetermined value or more. Is called a stable state, and when the difference is smaller than a predetermined value, it is called an unstable state.

Furthermore, the control circuit 81 includes position information (information indicating the value of the current position signal) to be described later indicating the position of the detection target, threshold information indicating the threshold, detection information indicating the detection result of the detection target, Various information such as maximum position information indicating the maximum value of the position signal, minimum position information indicating the minimum value of the position signal, and error information is stored in the memory 88.

In addition, the control circuit 81 switches and displays various information such as position information, threshold information, detection information, stability information, maximum position information, minimum position information, and error information stored in the memory 88 on the display unit 30. .

The selection / determination / setting switch 40 is used for a selection operation for selecting the type of information to be displayed on the display unit 30 and sets a value that is generated based on the position signal and can be adjusted with respect to processing of the control circuit 81. A new setting value (reference value) relating to the processing of the control circuit 81 is used for the setting operation for setting as a value (reference value), and the information value displayed on the display unit 30 and adjusted by an adjustment switch 50 described later. ) Is used for the determination operation for determining as). Here, the value that is generated based on the position signal and can be adjusted is a value calculated using the value of the position signal in a certain period or state or the value of the position signal itself, for example, in a certain period. An intermediate value between the maximum value and the minimum value of the position signal, an intermediate value of the value of the position signal in two states, a value of the position signal in a certain state, and the like.

The control circuit 81 switches the type of information to be displayed on the display unit 30 in response to the selection operation of the selection / determination / setting switch 40, and changes the position signal in response to the setting operation of the selection / determination / setting switch 40. A value generated based on this value and stored in memory 88 as a setting value, and a value of information displayed on display unit 30 in response to the determination operation of selection / determination / setting switch 40 as a new setting value The data is stored in the memory 88.

The adjustment switch 50 is used to adjust the value of information displayed on the display unit 30 among various values related to the processing of the control circuit 81.

In this embodiment, the LED 22 corresponds to a light emitting unit, the PSD 24 corresponds to a light receiving unit, the light projecting lens 21 corresponds to a light projecting unit, and the light receiving lens 23 corresponds to a light receiving unit. The display unit 30 corresponds to display means, the adjustment switch 50 corresponds to adjustment means, and the selection / determination / setting switch 40 corresponds to selection means, determination means, and setting means. Further, the control circuit 81 corresponds to a processing unit, and the memory 88 corresponds to a storage unit. The indicator lamp 60 corresponds to a display unit, and the output cable 70 corresponds to an output line.

FIG. 4 is a schematic diagram for explaining position information and threshold information. On the optical axis of the projection light from the LED 22, the range in which the reflected light from the detection target can enter the light receiving surface of the PSD 24 is the detection region D0. A set position ST is set in advance in the detection area D0. This set position ST means a position where the detection result based on the reflected light from the detection region D0 changes between the on state and the off state.

In the detection region D0, the detectable range D1 is between the end P1 closest to the photoelectric switch 1 and the set position ST, and the non-detected range D2 is between the end P2 farthest from the photoelectric switch 1 and the set position ST. Become. The control circuit 81 in FIG. 3 determines that a detection target exists when the PSD 24 receives reflected light from the detectable range D1.

The position of the detection object in the detection area D0 is represented by position information with the end P1 of the detection area D0 as the origin. For example, the position information of the end portion P1 of the detection area D0 is set to 0, and the position information of the end portion P2 is set to 999. Similarly to the position information, the set position ST is represented by threshold information whose origin is the end portion P1 of the detection area D0. When the set position ST is set at the end P1 of the detection area D0, the threshold information is 0, and when the set position ST is set at the end P2 of the detection area D0, the threshold information is 999. It becomes. With such position information and threshold information, it is possible to easily grasp the position of the detection object and the set position ST in the detection region D0 and the relative relationship between the position of the detection object and the set position ST. .

FIG. 5 is a diagram showing the display unit 30 and the indicator lamp 60 in the photoelectric switch 1 of FIG.

As shown in FIG. 5A, various kinds of information such as position information and threshold information are displayed on the display unit 30 as characters such as numbers and letters. Further, as shown in FIG. 5B, the indicator lamp 60 includes a detection display LED (light emitting diode) 62a for displaying the detection result and a stability display LED (light emitting diode) 62b for displaying the detection stability. Is built-in.

When the detection result is on, the detection display LED 62a is turned on, and when the detection result is off, the detection display LED 62a is turned off. When the detection stability is stable, the stability display LED 62b is turned on, and when the detection stability is unstable, the stability display LED 62b is turned off.

In the photoelectric switch 1 of the present embodiment, as described above, the type of information displayed on the display unit 30 can be switched by the selection operation of the selection / determination / setting switch 40 in FIG. For example, each time the selection / decision / setting switch 40 is pressed and released, the display content of the display unit 30 is in the order of position information, threshold information, detection information, stability information, maximum position information, minimum position information, error information, and the like. Can be switched.

In addition, a value that can be generated and adjusted based on the position signal by the setting operation of the selection / determination / setting switch 40 can be set as a setting value. In this case, the set value is displayed on the display unit 30 and stored in the memory 88 after a predetermined time of the setting operation.

6, 7 and 8 are diagrams showing specific examples of the setting operation of the selection / decision / setting switch 40. FIG. 6 (c), 7 (c), and 8 (b), the state where the selection / decision / setting switch 40 is pressed is indicated by a high level, and the state where the selection / decision / setting switch 40 is not depressed is indicated by a low level. Is shown.

As a first method, as shown in FIG. 6A, when the threshold value is set based on the moving detection object 500, as shown in FIG. 6C, the selection / determination / After pressing the setting switch 40 for a predetermined time (3 seconds in the example of FIG. 6) or more, the selection / decision / setting switch 40 is released. As a result, as shown in FIG. 6B, the position signal {(NF) / (N + F)} calculated using the received light signals N and F during the period when the selection / decision / setting switch 40 is being pressed. An intermediate value between the maximum value and the minimum value is automatically set as the threshold value th. The threshold value th set in this way is displayed on the display unit 30.

As a second method, when the threshold value is set based on the stationary detection target object 500, the detection target object is first placed in front of the background object 501, as shown in FIGS. After the selection / decision / setting switch 40 is pressed briefly in the absence of 500, the selection / decision / setting switch 40 is released, and then the selection / determination is performed with the detection object 500 placed in front of the background object 501. After pressing the / setting switch 40 again briefly, the selection / decision / setting switch 40 is released. As a result, as shown in FIG. 7B, the intermediate value of the position signal {(NF) / (N + F)} calculated using the light reception signals N and F in the above two states. Is automatically set as the threshold th. The threshold value th set in this way is displayed on the display unit 30.

As a third method, when the threshold value is set based on the detection target object 500 existing at a predetermined position, the detection target object is first placed in front of the background object 501 as shown in FIG. After the selection / decision / setting switch 40 is pressed briefly in the absence of 500, the selection / decision / setting switch 40 is released, and then the selection / determination / setting is performed with the detection object 500 placed at a predetermined position. After pressing the switch 40 for a predetermined time (3 seconds in the example of FIG. 8) or more, the selection / decision / setting switch 40 is released. As a result, the value of the position signal {(NF) / (N + F)} calculated using the received light signals N and F with the detection object 500 placed at a predetermined position is automatically set as the threshold th. Is set automatically. The threshold value th set in this way is displayed on the display unit 30.

Further, the value of information displayed on the display unit 30 can be adjusted by operating the adjustment switch 50 of FIG. For example, when threshold information is displayed on the display unit 30, when one adjustment switch 50 is pressed, the value of the threshold information increases, and when the other adjustment switch 50 is pressed, the threshold information is displayed. The value of decreases.

Furthermore, the information displayed on the display unit 30 can be switched between position information and threshold information by operating the adjustment switch 50. For example, when the position information value is displayed on the display unit 30, when one of the adjustment switches 50 is pressed briefly, the threshold information value set so far is displayed on the display unit 30, Subsequently, when any of the adjustment switches 50 is pressed briefly, the value of the threshold information displayed on the display unit 30 changes by one. Along with this, the threshold value stored in the memory 88 is also automatically updated. If the adjustment switch 50 is not operated for a predetermined time after adjusting the threshold, the display on the display unit 30 is automatically switched to position information.

Further, the value of information displayed on the display unit 30 can be determined as a new set value by the determination operation of the selection / determination / setting switch 40 of FIG. For example, when the value of the threshold information is displayed on the display unit 30, if the selection / decision / setting switch 40 is continuously pressed for a predetermined time or longer, the value of the threshold information displayed on the display unit 30 is not updated. It is stored in the memory 88 as a threshold value.

9 is a cross-sectional view in a direction parallel to the side surface portions 15 and 16 of the photoelectric switch 1 in FIG. 1, and FIG. 10 is a cross-sectional view in a direction parallel to the end surface portions 11 and 12 of the photoelectric switch 1 in FIG. FIG. 11 is an exploded perspective view of a part of the photoelectric switch 1 of FIG.

As shown in FIG. 9, two hole portions 28 </ b> A and 28 </ b> B are formed in the element holder 27 that constitutes a part of the front surface portion 14 and the end surface portion 12 of the casing 10. The light projecting lens 21 and the light receiving lens 23 are fitted in the outer opening ends of the hole portions 28 </ b> A and 28 </ b> B of the element holder 27 and are pressed by the lens cover 25. An LED 22 and a PSD 24 are respectively attached to the inner opening end of the element holder 27. The LED 22 and the PSD 24 are fixed to the element holder 27 by element presses 29A and 29B.

On the other hand, a transparent window 35 is integrally formed at the center of the back surface 13 of the casing 10. Switch mounting holes 18 are respectively formed on both sides of the window portion 35 of the back surface portion 13. As shown in FIG. 11, columnar pressing members 51 are respectively inserted into the switch mounting holes 18. An O-ring 51a is provided at the lower end of the outer peripheral portion of the pressing member 51 via a thin portion. Further, a rod-shaped pressing portion 51 b is provided on the lower surface of the pressing member 51. The pressing member 51, the O-ring 51a, and the pressing portion 51b are integrally formed of resin.

A diffusion sheet 34 is disposed inside the window portion 35. Further, a 7-segment unit 33 is disposed inside the diffusion sheet 34. The seven segment unit 33 is formed with a plurality of slits 33b corresponding to the segments constituting the three sets of characters. Through holes 33a are formed on both sides of the plurality of slits 33b of the 7-segment unit 33, respectively.

Further, the circuit board 100 is disposed inside the 7-segment unit 33 in the casing 10 via the 7-segment cover 32. The seven-segment cover 32 is formed with a plurality of slits 32b corresponding to the segments constituting the three sets of characters.

On the circuit board 100, a plurality of LEDs (light emitting diodes) 31 for generating a light emission pattern of a character are attached. In addition, switch buttons 52 are respectively attached to both sides of the plurality of LEDs 31 on the circuit board 100.

Further, locking portions 32a are provided on both sides of the 7-segment cover 32 so as to protrude downward. On the other hand, notches 100 a are provided on both sides of the circuit board 100 at positions corresponding to the locking portions 32 a of the 7-segment cover 32. By fitting the locking portion 32a of the 7-segment cover 32 into the notch 100a of the circuit board 100, the plurality of LEDs 31 on the circuit board 100 are positioned in the slits 32b of the 7-segment cover 32, and the 7-segment cover 32 is fixed to the circuit board 100.

The push type adjustment switch 50 includes a pressing member 51 having an O-ring 51a and a pressing portion 51b, and a switch button 52. In a state where the pressing member 51 is inserted into the switch mounting hole 18 from the inside of the casing 10 and the pressing portion 51b is inserted into the through hole 33a, the 7-segment unit 33 places the diffusion sheet 34 inside the back surface portion 13 of the casing 10. Attached through. In this case, as shown in FIG. 7, the 7-segment unit 33 is fixed by the ribs 17 provided inside the side surface portions 15 and 16 of the casing 10. Accordingly, the O-ring 51a of the pressing member 51 is pressed against the inner surface of the back surface portion 13 of the casing 10 by the 7-segment unit 33, and the O-ring 51a and the casing 10 are in close contact with each other.

Further, the circuit board 100 is fixed in the casing 10 such that the 7-segment cover 32 contacts the 7-segment unit 33 and the pressing portion 51b of the pressing member 51 contacts the switch button 52. Thereby, the slit 32 b of the 7 segment cover 32 is positioned in the slit 33 b of the 7 segment unit 33, and the plurality of LEDs 31 on the circuit board 100 are positioned in the plurality of slits 33 b of the 7 segment unit 33.

The plurality of LEDs 31, the 7 segment cover 32, the 7 segment unit 33, the diffusion sheet 34, and the window portion 35 constitute the display unit 30.

As shown in FIG. 9, a switch mounting hole 19 is formed in the end surface portion 11 of the casing 10. Further, a transparent indicator lamp cover 61 is provided on the end surface portion 11. A cylindrical pressing member 41 is inserted into the switch mounting hole 19. Similar to the pressing member 51, the pressing member 41 includes an O-ring 41a and a pressing portion 41b. A base member 43 having a through hole is disposed inside the end surface portion 11 of the casing 10. A circuit board 103 is disposed inside the base member 43.

On the circuit board 103, a switch button 42 is attached, and a detection display LED 62a and a stability display LED 62b (see FIG. 5) are attached.

The push-type selection / determination / setting switch 40 includes a pressing member 41 having an O-ring 41a and a pressing portion 41b, and a switch button 42. The indicator lamp 60 includes an indicator lamp cover 61, a detection display LED 62a, and a stability display LED 62b.

The base member 43 presses the O-ring 41 a of the pressing member 41 against the inner surface of the end surface portion 11 of the casing 10. The pressing member 41 is inserted into the switch mounting hole 19 from the inside of the casing 10, and the pressing portion 41b contacts the switch button 42 through the through hole of the base member 43, and the detection display LED 62a and the stability display LED 62b are displayed. The circuit board 103 is fixed in the casing 10 so as to be located inside the lamp cover 61.

An integrated circuit (IC) 81a constituting the control circuit 81 and the amplifiers 82 and 83 in FIG. As shown in FIG. 10, a circuit board 101 and a circuit board 102 are attached to the back side of the circuit board 100 so as to be perpendicular to the circuit board 100. The circuit board 101 is mainly provided with a power supply circuit. The circuit board 102 is mainly provided with the LED drive circuit 84 of FIG.

In the photoelectric switch 1 of the present embodiment, the selection / determination / setting switch 40 is provided on the end surface portion 11 of the casing 10 and the adjustment switch 50 is provided on the rear surface portion 13 of the casing 10. An erroneous operation of the switch 40 and the adjustment switch 50 can be prevented. In addition, since the display unit 30 and the adjustment switch 50 are provided on the back surface portion 13 of the casing 10, various information values such as threshold information can be set by operating the adjustment switch 50 while viewing the display on the display unit 30. It can be adjusted easily and accurately.

In addition, since the adjustment switch 50 is a push-type switch and the O-ring 51a is integrally provided on the pressing member 51, a sufficient display area of the display unit 30 can be ensured while the casing 10 is downsized. And airtightness in the casing 10 can be ensured. Further, since the pressing member 51 of the adjustment switch 50 can be made sufficiently large, the operability of adjustment can be improved. Furthermore, since the selection / decision / setting switch 40 is a push-type switch and the pressing member 41 is integrally provided with the O-ring 41a, the size of the indicator lamp 60 can be reduced while reducing the size of the casing 10. It can be ensured sufficiently and airtightness in the casing 10 can be ensured. In addition, since the pressing member 41 of the selection / determination / setting switch 40 can be made sufficiently large, the operability of selection, determination and setting can be improved.

Furthermore, by providing the output cable 70 at the corner between the end surface portion 12 and the back surface portion 13 that faces the end surface portion 11, it is possible to select / enlarge the end surface portion 11 while maintaining the downsizing of the casing 10. The determination / setting switch 40 and the indicator lamp 60 can be provided, and the display unit 30 and the adjustment switch 50 having a sufficiently large size can be provided on the back surface unit 13. Further, it is possible to prevent the output cable 70 from interfering with the light projecting / receiving unit 20 of the front surface part 14. Note that the output cable 70 may be attached to the end surface portion 12.

FIG. 12 is a schematic diagram showing another example of the selection / decision / setting switch. In the example of FIG. 12, a plurality of selection / determination / setting switches 40a, 40b, 40c, 40d, and 40e are provided on the end surface portion 11 of the casing 10 of FIG. For example, when the selection / decision / setting switch 40a is pressed, the position information is displayed on the display unit 30 in FIG. When the selection / decision / setting switch 40b is pressed, threshold information is displayed on the display unit 30. When the selection / decision / setting switch 40c is pressed, the detection information is displayed on the display unit 30. When the selection / decision / setting switch 40d is pressed, the stability information is displayed on the display unit 30. When the selection / decision / setting switch 40e is pressed, error information is displayed on the display unit 30.

Further, when two of the selection / determination / setting switches 40a to 40e are pressed at the same time, a value generated and adjustable based on the position signal is set as a setting value and stored in the memory 88. Further, when other predetermined two of the selection / determination / setting switches 40 a to 40 e are pressed at the same time, the value of the information displayed on the display unit 30 is determined as a new setting value and stored in the memory 88.

FIG. 13 is a schematic diagram of a selection switch and a determination / setting switch provided independently. In the example of FIG. 13, a selection switch 40A and a determination / setting switch 40B are separately provided on the end surface portion 11 of the casing 10 of FIG. The type of information displayed on the display unit 30 can be switched by pressing and releasing the selection switch 40A. Further, by pressing and releasing the enter / set switch 40B, a value that is generated based on the position signal and can be adjusted can be set as a set value and stored in the memory 88 or displayed on the display unit 30. The information value can be determined as a new set value and stored in the memory 88.

Furthermore, the determination switch and the setting switch may be separately provided on the end surface portion 11 of the casing 10.

In the photoelectric switch 1 of the above-described embodiment, the value of information displayed on the display unit 30 is adjusted using the adjustment switch 50 and then displayed by performing a determination operation using the selection / determination / setting switch 40. The value of the information displayed on the unit 30 is stored in the memory 88 as a new set value. However, when the value displayed on the display unit 30 is adjusted using the adjustment switch 50, the adjusted value is stored in the memory 88. You may comprise so that it may memorize | store automatically.

FIG. 14 is an external perspective view of a triangulation type photoelectric switch in another embodiment of the present invention.

The photoelectric switch 1a in FIG. 14 is different from the photoelectric switch 1 in FIG. 1 in that the indicator lamp 60 is provided at the corner between the end surface portion 11 and the back surface portion 13 of the casing 10. The configuration of other parts of the photoelectric switch 1a in FIG. 14 is the same as the configuration of the photoelectric switch 1 in FIG.

FIG. 15 is a perspective view showing an example of use of the photoelectric switch 1a of FIG. As shown in FIG. 15, the detection object 500 is conveyed in the direction of arrow X by the belt conveyor 501, and the photoelectric switch 1 a is installed above the belt conveyor 501. In this case, the photoelectric switch 1a is arranged so that the back surface portion 13 of the casing 10 faces upward.

In the photoelectric switch 1a of the present embodiment, since the indicator lamp 60 is provided at the corner between the end face portion 11 and the back face portion 13 of the casing 10, the indicator lamp 60 is connected to the photoelectric switch 1a as indicated by an arrow. Can be seen from above, front, both sides, and diagonally below. Thus, in the photoelectric switch 1a of the present embodiment, the visibility of the indicator lamp 60 is improved.

In the above-described embodiment, the case where the photoelectric switch according to the present invention is applied to the photoelectric switch of the triangulation method has been described, but the present invention is not limited to the photoelectric switch of the triangulation method, but from the detection object. A photoelectric switch that detects the presence or absence of a detection object based on the amount of received light of reflected or transmitted light, and displays the amount of received light and an adjustable threshold value on a display unit, and reflected or transmitted light from the detection object The present invention can be similarly applied to a photoelectric switch that displays a threshold value calculated based on the received light amount and a margin with respect to the threshold value on a display unit. The margin corresponds to the difference between the threshold value and the amount of received light when detected or not detected.

DESCRIPTION OF SYMBOLS 1,1a Photoelectric switch 10 Casing 11,12 End surface part 13 Back surface part 14 Front surface part 15,16 Side surface part 18,19 Switch mounting hole 20 Light emitting / receiving part 21 Light projection lens 22 LED
23 Photosensitive lens 24 PSD
30 Display 31 LED
32 7-segment cover 33 7-segment unit 35 Window portion 40, 40a, 40b, 40c, 40d, 40e Selection / determination / setting switch 40A Selection switch 40B Determination / setting switch 41, 51 Press member 41a, 51a O-ring 50 Adjustment switch 60 Indicator light 62a LED for detection display
62b LED for stability display
70 Output cable 500 Object to be detected

Claims (4)

A photoelectric switch that detects the presence or absence of an object in the detection region by projecting light to the detection region and receiving feedback light from the detection region,
A light emitting means for generating light and a light receiving means for outputting a light receiving signal corresponding to a light receiving state of feedback light from the detection region, and a casing having a plurality of outer surfaces;
Processing means for processing a received light signal output from the light receiving means;
Display means provided on a first outer surface of the plurality of outer surfaces of the casing and capable of switching and displaying a plurality of types of values related to the processing of the processing means;
Adjusting means provided on the first outer surface for adjusting the value displayed on the display means in the processing means;
An indicator lamp that is provided at a corner between the second outer surface adjacent to the first outer surface and the first outer surface of the plurality of outer surfaces of the casing, and displays information on the detection state of the processing means. When,
Unlike the first and second outer surfaces of the plurality of outer surfaces of the casing, the light generated by the light emitting means is projected onto the detection region on a third outer surface that faces the first outer surface. A light projecting / receiving unit that receives the feedback light from the detection region and guides it to the light receiving unit
A photoelectric switch comprising:   The casing incorporates the processing means, and the processing means performs a detection process for detecting the presence or absence of an object in the detection region by processing a light reception signal output from the light receiving means, and outputs information on a detection state. The power is output via a line, and the output line extends to the outside of the casing from a corner between the outer surface facing the second outer surface of the casing and the first outer surface. The photoelectric switch according to 1. A storage unit for storing values generated by the processing means;
A value provided on the second outer surface of the plurality of outer surfaces of the casing and generated based on the processing of the processing means and adjustable to detect the presence or absence of an object is stored in the storage unit as a reference value. The photoelectric switch according to claim 1, further comprising setting means for performing a setting for the purpose. An object detection method using a photoelectric switch that detects the presence or absence of an object on a transport machine by projecting light onto a detection area and receiving feedback light from the detection area,
The photoelectric switch includes at least a light emitting unit that generates light and a light receiving unit that outputs a light reception signal corresponding to a light reception state of feedback light from the detection region, and
A casing having a plurality of outer surfaces;
Processing means for processing a received light signal output from the light receiving means;
Display means provided on the first outer surface of the plurality of outer surfaces of the casing, and capable of switching and displaying a plurality of types of values related to the processing of the processing means;
Adjusting means provided on the first outer surface for adjusting the value displayed on the display means in the processing means;
An indicator lamp that is provided at a corner between the second outer surface adjacent to the first outer surface and the first outer surface of the plurality of outer surfaces of the casing, and displays information on the detection state of the processing means. When,
Unlike the first and second outer surfaces of the plurality of outer surfaces of the casing, the light generated by the light emitting means is projected onto the detection region on a third outer surface that faces the first outer surface. A light projecting / receiving unit that receives the feedback light from the detection region and guides it to the light receiving unit
With
A detection method in which the photoelectric switch is disposed such that the third outer surface faces the transporter and the first outer surface faces upward, and detects the presence or absence of an object on the transporter.

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