JP3854300B2 - Photoelectric switch - Google Patents

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

  In FIG. 21, 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 as a light spot on the light receiving surface of the PSD 804 through the light receiving lens 803.

  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 receiving signal N has a level (current value) proportional to the distance from one end e1 of the light receiving surface of PSD 804 to the light spot, and the other light receiving signal F is from the other end e2 of the light receiving surface to the light spot. It has a level (current value) 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. 22 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. 22A, 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. 22B. 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. 23 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. 23A, the detection object 900 is arranged at a predetermined position in front of the photoelectric switch 800, and the trimmer switch 810 is rotated to the right until the detection indicator lamp 811 is turned on.

  Next, as shown in FIG. 23B, the detection object 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. 23 (c), the trimmer switch 810 is returned to the left, and is set to an intermediate position between the position of FIG. 23 (a) and the position of FIG. 23 (b). 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.
JP 05-7145 A

  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. On the other hand, in order to reduce the installation area, it is desired to reduce the size of the photoelectric switch.

An object of the present invention is to provide a photoelectric switch capable of easily and accurately recognizing information relating to processing of a received light signal while reducing the size.

(1) 1st invention The photoelectric switch which concerns on 1st invention is a photoelectric switch which detects the presence or absence of the object in a detection area by projecting light to a detection area and receiving the return light from a detection area. A casing having light emitting means for generating light and a light receiving means for outputting a light receiving signal corresponding to the light receiving state of the return light from the detection area, and having first and second outer surfaces facing each other; A first circuit board disposed so that one surface faces the first outer surface and one surface of the first circuit board are related to processing of a light reception signal output from the light receiving means and detect the presence or absence of an object. Display means for electrically displaying information that can be adjusted through the first outer surface, and adjustment for adjusting the value displayed on the first outer surface of the casing. Adjusting means, a light projecting / receiving unit provided on the second outer surface side in the casing, for projecting light generated by the light emitting means to the detection area and receiving feedback light from the detection area to the light receiving means, And the second and third circuit boards provided between the other surface of the first circuit board and the second outer surface , wherein the second and third circuit boards are spaced apart from each other and each Each side of the first circuit board is in contact with the other surface of the first circuit board, and a drive circuit for driving the light emitting means is provided on the second circuit board. A power supply circuit is provided on the substrate, and the adjusting means includes a switch provided on one surface of the first circuit substrate.

In the photoelectric switch according to the present invention, the light generated by the light emitting means is projected to the detection area through the light projecting / receiving section, and the return light from the detection area is received by the light receiving means through the light projecting / receiving section, and the light quantity depends on the amount of light received. A light reception signal is output. Information relating to the processing of the received light signal and adjustable to detect the presence or absence of an object is electrically displayed numerically by the display means. As a result, the user can easily and accurately recognize information related to the processing of the received light signal.

In addition, since the display means and the light projecting / receiving part are provided on the first outer surface side and the second outer surface side facing each other of the casing, the area of the light projecting / receiving part and the area of the display means can be reduced while reducing the size of the casing. It can be secured sufficiently. Therefore, the user can easily and accurately recognize information related to the processing of the received light signal while ensuring high detection accuracy.

Further, since the adjusting means is provided on the same first outer surface as the display means of the casing, the user can easily and accurately adjust the value while viewing the information displayed on the display means.

Further, the first circuit board is disposed so that one surface thereof faces the first outer surface in the casing, and display means is provided on one surface of the first circuit board. Further, in the casing, the second and third circuit boards are arranged perpendicular to the first circuit board such that the second and third circuit boards are spaced apart from each other and each side is in contact with the other surface of the first circuit board , A drive circuit for driving the light emitting means is provided on the second circuit board, and a power supply circuit is provided on the third circuit board. Further, the switch of the adjusting means is provided on one surface of the first circuit board.

  Thus, since the display means, the drive circuit, the power supply circuit, the switch, the first, second and third circuit boards are efficiently arranged in the casing, the casing can be reduced in size.

(2) Second Invention A photoelectric switch according to a 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 light emitting means for generating light and a light receiving means for outputting a light receiving signal corresponding to the light receiving state of the return light from the detection area, and having first and second outer surfaces facing each other; A first circuit board arranged so that one surface faces the first outer surface, and one surface of the first circuit board for detecting the presence or absence of an object based on a light reception signal output from the light receiving means Display means for electrically displaying an adjustable threshold value through the first outer surface, and a threshold value provided on the first outer surface of the casing and the first circuit board and displayed on the display means. An adjusting means for adjusting the light intensity, and a light projecting / receiving light that is provided on the second outer surface side in the casing, projects the light generated by the light emitting means to the detection area, and receives the feedback light from the detection area and guides it to the light receiving means And a second and third circuit board provided between the other surface of the first circuit board and the second outer surface in the casing, the second and third circuit boards being spaced from each other And a drive circuit for driving the light emitting means is provided on the second circuit board so that each side is in contact with the other surface of the first circuit board. The power supply circuit is provided on the third circuit board.

In the photoelectric switch according to the present invention, the light generated by the light emitting means is projected to the detection area through the light projecting / receiving section, and the return light from the detection area is received by the light receiving means through the light projecting / receiving section, and the light quantity depends on the amount of light received. A light reception signal is output. Then, a threshold value that can be adjusted to detect the presence / absence of an object based on the received light signal is electrically displayed numerically by the display means.

Thereby, the user can easily and accurately recognize the threshold for detecting the presence or absence of an object. Further, since the display means and the light projecting / receiving unit are provided on the first outer surface side and the second outer surface side of the casing facing each other, the area of the light receiving unit and the light projecting unit and the display unit can be reduced while reducing the size of the casing. Can be secured sufficiently. Therefore, the user can easily and accurately recognize the adjustable threshold value while ensuring high detection accuracy.

Further, since the adjusting means are provided on the same first outer surface and the display unit of the casing, the user can adjust its value easily and accurately while viewing the threshold value displayed on the display means .

Further, the first circuit board is disposed so that one surface thereof faces the first outer surface in the casing, and display means is provided on one surface of the first circuit board. Further, in the casing, the second and third circuit boards are arranged perpendicular to the first circuit board such that the second and third circuit boards are spaced apart from each other and each side is in contact with the other surface of the first circuit board , A drive circuit for driving the light emitting means is provided on the second circuit board, and a power supply circuit is provided on the third circuit board.

  Thus, since the display means, the drive circuit, the power supply circuit, the switch, the first, second and third circuit boards are efficiently arranged in the casing, the casing can be reduced in size.

(3) Third Invention A photoelectric switch according to a third invention is the configuration of the photoelectric switch according to the second invention, wherein the adjusting means includes a switch provided on one surface of the first circuit board.

  In this case, it is possible to ensure a sufficient display area of the display means while keeping the casing small, and to improve the operability of the adjustment means.

(4) Fourth invention A photoelectric switch according to a fourth invention is the photoelectric switch according to the first or third invention, wherein the adjusting means is provided on the first outer surface of the casing and presses the switch. It has a pressing member .

  In this case, since the switch is a push switch, the display area of the display means can be sufficiently ensured while the casing is downsized. Moreover, since the pressing member can be made sufficiently large, the operability of the adjusting means can be improved.

(5) Fifth Invention A photoelectric switch according to a fifth invention is the configuration of the photoelectric switch according to any one of the first to fourth inventions, wherein the display means is provided on one surface of the first circuit board. A plurality of light emitting elements.

  In this case, a light emission pattern corresponding to the character to be displayed is generated by the plurality of light emitting elements. In particular, since a plurality of light emitting elements are provided on one surface of the first circuit board, assembly is facilitated.

  A photoelectric switch according to a sixth aspect of the invention is the photoelectric switch according to the fifth aspect of the invention, wherein the display means includes a cover provided on one surface of the first circuit board so as to cover the plurality of light emitting elements, The cover has a slit at each position on the plurality of light emitting elements.

  A photoelectric switch according to a seventh aspect of the invention is the photoelectric switch according to the fifth or sixth aspect of the invention, wherein the plurality of light emitting elements are 7-segment light emitting diodes.

  According to an eighth aspect of the present invention, there is provided a photoelectric switch according to any one of the first to fourth aspects, wherein the display means includes a liquid crystal display device provided on one surface of the first circuit board. .

( 9 ) Ninth Invention A photoelectric switch according to a ninth invention is the photoelectric switch according to any one of the first to eighth inventions, further comprising a holder provided in the casing for holding the light projecting / receiving unit. It is provided. In this case, the light projecting / receiving unit is held by the holder in the casing.

( 10 ) Tenth Invention A photoelectric switch according to a tenth invention is the configuration of the photoelectric switch according to the ninth invention, wherein a part of the holder is disposed between the second circuit board and the third circuit board. It has been done.

  In this case, a part of the holder is disposed between the second circuit board and the third circuit board in the casing.

( 11 ) Eleventh Invention A photoelectric switch according to an eleventh invention is a photoelectric switch according to any of the ninth and tenth inventions, wherein the light emitting means and the light receiving means are held by a holder. In this case, the light projecting / receiving unit, the light emitting unit, and the light receiving unit are held by the holder.

(12) is a photoelectric switch according to the invention of the twelfth aspect twelfth, in the configuration of the photoelectric switch according to any one of the first to eleventh, emitting and receiving portion are those containing a light projecting lens and the light receiving lens.

  In this case, the light generated by the light emitting means is projected to the detection area through the light projecting lens, and the feedback light from the detection area is received by the light receiving means through the light receiving lens.

( 13 ) Thirteenth Invention A photoelectric switch according to a thirteenth invention further comprises processing means built in the casing in the configuration of the photoelectric switch according to any one of the first to twelfth inventions, A detection process for detecting the presence or absence of an object in the detection region is performed by processing a light reception signal output from the light receiving means, and information on the detection state is output via an output line. The output line is a first outer surface of the casing. It extends from the different part to the outside of the casing.

  In this case, since the output line extends from the portion different from the first outer surface of the casing to the outside of the casing, a sufficiently large display means and adjusting means are provided on the first outer surface of the casing while keeping the casing small. be able to.

( 14 ) Fourteenth Invention A photoelectric switch according to a fourteenth invention is the photoelectric switch according to the thirteenth invention, wherein the casing further has a third outer surface perpendicular to the first and second outer surfaces, The output line extends from the corner between the first outer surface and the third outer surface of the casing to the outside of the casing.

  In this case, since the output line extends from the corner between the first outer surface and the third outer surface of the casing to the outside of the casing, the size of the first outer surface of the casing is sufficiently large while keeping the casing small. Display means and adjustment means can be provided. Further, it is possible to prevent the output line from interfering with the light projecting / receiving unit.

( 15 ) Fifteenth Invention A photoelectric switch according to a fifteenth invention is the photoelectric switch according to the fourteenth invention, wherein the casing further has a fourth outer surface facing the third outer surface, 4 further includes a display unit that displays information about the detection state of the processing means.

  In this case, information relating to the detection state of the processing means is displayed on the display unit provided on the fourth outer surface.

(16) The photoelectric switch according to the sixteenth invention of the present invention 16, in the configuration of the photoelectric switch according to the thirteenth to fifteenth any one of the display means switches the plural kinds of information regarding the processing of the processing means It is configured to be displayable.

In this case, a plurality of types of information related to the processing of the processing means can be switched and displayed by the display means.

According to the present invention, it is possible to easily and accurately recognize information related to the processing of the received light signal while reducing the size. In addition, it is possible to easily and accurately recognize a threshold that can be adjusted to detect the presence or absence of an object based on a light reception signal while reducing the size.

  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 parts 15 and 16 of the casing 10 are used to fix the photoelectric switch 1 in contact with other devices.

  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 light reception signals N 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. 22, 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.

  The control circuit 81 further includes position information (information indicating the value of the current position signal) to be described later indicating the position of the detection object, threshold information indicating the threshold value, and detection information indicating the detection result of the detection object. 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 control circuit 81 corresponds to processing means.

  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 area 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 without 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. 10, 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 present embodiment, the plurality of LEDs 31 correspond to a light emission pattern generation unit, the 7 segment unit 33 corresponds to a segment forming member, the 7 segment cover 32 corresponds to a positioning member, and the O-ring 51a corresponds to an annular seal member. . The plurality of LEDs 31 and the integrated circuit 81a correspond to a circuit for display by the display means, the integrated circuit 81a and the switch button 52 correspond to at least a part of a circuit related to the operation of the adjusting means, and the integrated circuit 81a This corresponds to at least a part of a circuit for driving the light emitting means or outputting a signal from the light receiving means.

  FIGS. 12 and 13 are views showing a method of assembling the photoelectric switch 1 of FIG. 1, (a) is a cross-sectional view in a direction parallel to the side surfaces 15 and 16 of the photoelectric switch 1, and (b) is a diagram of the photoelectric switch 1. FIG. 6 is a cross-sectional view in a direction parallel to the end surface portions 11 and 12.

  In the state shown in FIG. 12, the pressing member 51 is inserted into the switch mounting hole 18 from the inside of the casing 10, and the diffusion sheet 34 is arranged inside the window portion 35 of the casing 10. Then, the 7-segment unit 33 is disposed inside the back surface portion 13 of the casing 10 so that the pressing portion 51b of the pressing member 51 is inserted into the through hole 33a, and is fixed to the casing 10 with the ribs 17. Thereby, as shown in FIG. 13, the pressing member 51, the diffusion sheet 34, and the 7-segment unit 33 are integrated into the casing 10.

  In addition, in the state shown in FIG. 12, a 7-segment cover 32 is disposed on the circuit board 100 so as to cover the plurality of LEDs 31, and the locking portions 32a of the 7-segment cover 32 are notched portions 100a of the circuit board 100 (FIG. 11). Fit into the reference). Thereby, as shown in FIG. 13, the 7-segment cover 32 is integrated with the circuit board 100.

  Thereafter, the circuit board 100 is fixed inside the casing 10 so that the upper surface of the 7-segment cover 32 comes into contact with the lower surface of the 7-segment unit 33. Thereby, the plurality of LEDs 31 on the circuit board 100 are positioned in the slits 33 b of the 7-segment unit 33. The plurality of LEDs 31 on the circuit board 100 are protected by a 7-segment cover 32.

  FIG. 14 is a perspective view showing the arrangement of the circuit boards 100, 101, 102 in the casing 10.

  As shown in FIG. 14, circuit boards 101 and 102 are arranged on the back side (back side) of the circuit board 100. The circuit boards 101 and 102 are vertically attached to the circuit board 100 along the long side of the circuit board 100. Since the circuit boards 101 and 102 are efficiently arranged so as to face both side surface portions 15 and 16 in the casing 10, downsizing of the casing 10 is not hindered.

  As described above, in the photoelectric switch 1 of this embodiment, the casing 10, the pressing member 51, the diffusion sheet 34, and the 7-segment unit 33 can be handled as one unit at the time of assembly, and the circuit board 100 and the 7-segment. The cover 32 can be handled as one unit. Further, by assembling these two units, the plurality of LEDs 31 on the circuit board 100 are positioned in the slits 33 b of the seven segment unit 33 by the seven segment cover 32. Therefore, positioning becomes unnecessary, and the assembly work of the display part 30 becomes easy.

  In addition, the circuit board 100 is disposed in the casing 10 so as to face the window portion 35 of the back surface portion 13, and a plurality of LEDs 31, a 7 segment cover 32, a 7 segment unit 33, and a diffusion sheet 34 that constitute the display unit 30 are arranged in a circuit. Since it is efficiently arranged between the substrate 100 and the window part 35, the display part 30 can be configured compactly. Therefore, the display area of the display unit 30 can be sufficiently secured while the casing 10 is downsized.

  Further, since the plurality of LEDs 31 of the display unit 30 are provided on the circuit board 100 and the integrated circuit 81a constituting the control circuit 81 and the amplifiers 82 and 83 is provided on the back surface of the circuit board 100, the casing 10 can be downsized. Is not disturbed.

  Further, since the light projecting / receiving unit 20 and the display unit 30 are respectively provided on the front surface part 14 and the rear surface part 13 of the casing 10 facing each other, the area of the light projecting / receiving unit 20 and the display unit 30 can be reduced while downsizing the casing 10. A sufficient display area can be secured. Therefore, the user can easily and accurately recognize various information while ensuring high detection accuracy.

  Further, since the transparent window portion 35 is integrally provided on the back surface portion 13 of the casing 10, airtightness in the casing 10 can be ensured without using a seal member, and the window portion 35 can be secured to the casing. 10 is not required to be attached, and assembly is facilitated.

  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.

  Further, since 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, the selection / determination / setting switch 40 and the adjustment switch 50 are erroneously operated. Can be prevented. Further, since the display unit 30 and the adjustment switch 50 are provided on the back surface part 13 of the casing 10, the values of various information can be adjusted easily and accurately by operating the adjustment switch 50 while viewing the display on the display unit 30. be able to.

  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.

  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.

  15, 16, and 17 are perspective views showing other examples of the arrangement of the circuit boards in the casing 10.

  In the example of FIG. 15, the circuit board 101 a and the circuit board 102 a are arranged on the back side (back side) of the circuit board 100. The circuit board 101 a is attached perpendicularly to the circuit board 100 along the short side of the circuit board 100. The circuit board 102 a is attached to the lower end of the circuit board 101 a so as to be parallel to the circuit board 100. The circuit board 101a is mainly provided with a power supply circuit, and the circuit board 102a is mainly provided with the LED drive circuit 84 of FIG.

  In the example of FIG. 16, the circuit board 101 and the circuit board 102 b are arranged on the back side of the circuit board 100. The circuit board 101 is attached perpendicularly to the circuit board 100 along the long side of the circuit board 100. A circuit board 102 b is attached to the lower end of the circuit board 101 so as to be parallel to the circuit board 100. 3 is mainly provided on the circuit board 102b.

  In the example of FIG. 17, the circuit board 102 c and the flexible circuit board 103 are arranged on the back side of the circuit board 100. The circuit board 102 c is arranged in parallel to the circuit board 100, and the long side of the circuit board 100 and the long side of the circuit board 102 c are connected by the flexible circuit board 103. The circuit board 102c is mainly provided with a power supply circuit, and the circuit board 103 is mainly provided with the LED drive circuit 84 of FIG.

  In addition, arrangement | positioning of the circuit board 100 in the casing 10 and another circuit board is not limited to said example, A some circuit board can be arrange | positioned in a various aspect.

  FIG. 18 is a cross-sectional view of a triangulation type photoelectric switch according to another embodiment of the present invention.

  In the photoelectric switch 1a of FIG. 18, the display unit 30a includes a liquid crystal display device 301, a support unit 302, and a liquid crystal display device drive circuit 303. The support unit 302 has the same configuration as the seven-segment unit 33 except that the plurality of slits 33b shown in FIG. 11 are not provided.

  The liquid crystal display device 301 is disposed on the support unit 302. The support unit 302 is fixed in the casing 10 so that the display surface of the liquid crystal display device 301 is positioned inside the window portion 35. The liquid crystal display device drive circuit 303 is mounted on the circuit board 100. The circuit board 100 is disposed on the back side of the support unit 302 in the casing 10 and is fixed to the casing 10. The configuration of other parts of the photoelectric switch 1a in FIG. 18 is the same as the configuration of the photoelectric switch 1 in FIG.

  In the photoelectric switch 1a of the present embodiment, the liquid crystal display device 301, the support unit 302, and the liquid crystal display device drive circuit 303 constituting the display unit 30a are efficiently arranged between the circuit board 100 and the window unit 35. Therefore, the display unit 30a can be configured compactly. Therefore, the display area of the display unit 30a can be sufficiently ensured while the casing 10 is downsized.

  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 Similarly, the present invention can be 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.

  In the above embodiment, the case where the present invention is applied to an integrated photoelectric switch has been described. However, as shown in FIGS. 19 and 20, the present invention is a head separation type in which the head portion is separated from the main body portion. The present invention can be similarly applied to the photoelectric switch.

  FIG. 19 is a schematic diagram illustrating an example of a head-separated photoelectric switch. The photoelectric switch of FIG. 19 includes a main body casing 210 and a head casing 230.

  The main body casing 210 contains a light projecting lens 221, a light emitting element 222, a light receiving lens 223, a light receiving element 224, and a circuit board 240. A display unit 220 is provided on the back surface 211 of the main body casing 210.

  The circuit board 240 is provided with a control circuit for processing a light reception signal output from the light receiving element 224 and a circuit for display on the display unit 220. In addition, the circuit board 240 is provided with a drive circuit that drives the light emitting element 220 and an amplifier that amplifies the light receiving signal output from the light receiving element 224.

  Light generated by the light emitting element 222 of the main body casing 210 is guided to the head casing 230 through the light projecting lens 221 and the optical fiber 231, and is projected from the head casing 230 onto the detection target 500. The reflected light from the detection object 500 is guided from the head casing 230 to the main body casing 210 through the optical fiber 232 and is received by the light receiving element 224 through the light receiving lens 223. The display unit 220 displays information values generated based on the light reception signal output from the light receiving element 224.

  In the photoelectric switch 1b of FIG. 19 as well, like the photoelectric switch 1 of FIG. 9 and the photoelectric switch 1a of FIG. 18, the circuit board 240 is efficiently arranged in the main body casing 210 so as to face the display unit 220. Thus, the display area of the display unit 220 can be sufficiently ensured while the main body casing 210 is downsized.

  FIG. 20 is a schematic diagram showing another example of a head-separated photoelectric switch. The photoelectric switch of FIG. 20 includes a main body casing 290 and a head casing 250.

  A control circuit 291 is built in the main body casing 290. The head casing 250 contains a light projecting lens 261, a light emitting element 262, a light receiving lens 263, a light receiving element 264, and a circuit board 280. A display portion 270 is provided on the back surface portion 251 of the head portion casing 250.

  A circuit for display on the display unit 270 is provided on the circuit board 280. The circuit board 280 is provided with at least a part of a drive circuit that drives the light emitting element 262 and an amplifier that amplifies the light reception signal output from the light receiving element 264. The control circuit 291 in the main body casing 290 controls a drive circuit for the circuit board 280 in the head casing 250 and processes a light reception signal from the light receiving element 264.

  The light generated by the light emitting element 262 of the head casing 250 is projected onto the detection target 500 through the light projection lens 261. The reflected light from the detection object 500 is received by the light receiving element 264 through the light receiving lens 263 of the head portion casing 250. The display unit 270 displays information values generated based on the light reception signal output from the light receiving element 264.

  Also in the photoelectric switch of FIG. 20, as in the photoelectric switch 1 of FIG. 9 and the photoelectric switch 1 a of FIG. 18, the circuit board 280 is efficiently arranged in the head portion casing 250 so as to face the display portion 270. The display area of the display unit 270 can be sufficiently ensured while the head casing 250 is downsized.

  The present invention can be used to detect the presence or absence of an object in a predetermined detection area.

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 sectional drawing which shows the assembly method of the photoelectric switch of FIG. It is sectional drawing which shows the assembly method of the photoelectric switch of FIG. It is a perspective view which shows arrangement | positioning of the circuit board in the casing of the photoelectric switch of FIG. It is a perspective view which shows the other example of arrangement | positioning of the circuit board in a casing. It is a perspective view which shows the other example of arrangement | positioning of the circuit board in a casing. It is a perspective view which shows the other example of arrangement | positioning of the circuit board in a casing. 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 schematic diagram which shows an example of a head separation type photoelectric switch. It is a schematic diagram which shows the other example of a head separation type photoelectric switch. 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.

Explanation of symbols

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 21,221,261 Light projection lens 22 LED
23,223,263 Photosensitive lens 24 PSD
30, 220, 270 Display 31 LED
32 7-segment cover 33 7-segment unit 35 Window 40 Selection / decision / setting switch 41, 51 Press member 41a, 51a O-ring 50 Adjustment switch 100, 240, 280 Circuit board 210, 290 Main body casing 230, 250 Head casing 222, 262 Light emitting element 224, 264 Light receiving element 301 Liquid crystal display device 302 Support unit 303 Driving circuit for liquid crystal display device 500 Detection object

Claims (16)

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 a first and a second outer surface facing each other, including 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;
A first circuit board disposed so that one surface of the casing faces the first outer surface;
Information provided on the one surface of the first circuit board and relating to processing of a light receiving signal output from the light receiving means and adjustable to detect the presence or absence of an object is numerically displayed through the first outer surface. Display means to
Adjusting means provided on the first outer surface of the casing for adjusting a value displayed on the display means;
A light projecting / receiving unit that is provided on the second outer surface side in the casing, projects the light generated by the light emitting unit to the detection region, and receives the feedback light from the detection region to guide the light receiving unit;
A second circuit board and a third circuit board provided between the other surface of the first circuit board and the second outer surface in the casing;
The second and third circuit boards are arranged perpendicular to the first circuit board such that the second circuit board and the third circuit board are spaced apart from each other and one side of the second and third circuit boards contacts the other surface of the first circuit board , A drive circuit for driving the light emitting means is provided on the second circuit board, and a power supply circuit is provided on the third circuit board.
The photoelectric switch is characterized in that the adjusting means includes a switch provided on the one surface of the first circuit board. 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 a first and a second outer surface facing each other, including 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;
A first circuit board disposed so that one surface of the casing faces the first outer surface;
A threshold value which is provided on the one surface of the first circuit board and can be adjusted to detect the presence or absence of an object based on a light receiving signal output from the light receiving means is electrically displayed numerically through the first outer surface. Display means to
Adjusting means for adjusting a threshold value provided on the first outer surface of the casing and the first circuit board and displayed on the display means;
A light projecting / receiving unit that is provided on the second outer surface side in the casing, projects the light generated by the light emitting unit to the detection region, and receives the feedback light from the detection region to guide the light receiving unit;
A second circuit board and a third circuit board provided between the other surface of the first circuit board and the second outer surface in the casing;
The second and third circuit boards are arranged perpendicular to the first circuit board so as to be spaced apart from each other and so that each side of the second and third circuit boards contacts the other surface of the first circuit board ; A photoelectric switch, wherein a drive circuit for driving the light emitting means is provided on the second circuit board, and a power supply circuit is provided on the third circuit board.   The photoelectric switch according to claim 2, wherein the adjustment unit includes a switch provided on the one surface of the first circuit board. 4. The photoelectric switch according to claim 1 , wherein the adjustment unit includes a pressing member that is provided on the first outer surface of the casing and presses the switch. 5.   The photoelectric switch according to claim 1, wherein the display unit includes a plurality of light emitting elements provided on the one surface of the first circuit board. The display means includes a cover provided on the one surface of the first circuit board so as to cover the plurality of light emitting elements,
The photoelectric switch according to claim 5 , wherein the cover has a slit at each position on the plurality of light emitting elements . 7. The photoelectric switch according to claim 5 , wherein the plurality of light emitting elements are 7-segment light emitting diodes . The display means, photoelectric switch according to claim 1, characterized in that it comprises a liquid crystal display device provided on the one surface of the first circuit board. Provided in the casing, photoelectric switch according to any one of claims 1 to 8, further comprising a holder for holding the light emitting and receiving parts. The photoelectric switch according to claim 9, wherein a part of the holder is disposed between the second circuit board and the third circuit board. 11. The photoelectric switch according to claim 9, wherein the light emitting unit and the light receiving unit are held by the holder. The photoelectric switch according to any one of claims 1 to 11, wherein the light emitting and receiving unit which comprises a light projecting lens and the light receiving lens. It further comprises processing means built in the casing,
The processing means performs detection processing 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 via an output line,
The output lines, the photoelectric switch according to any one of claims 1 to 12, characterized in that extending from the first outer surface and different parts of the casing to the outside of the casing. The casing further includes a third outer surface perpendicular to the first and second outer surfaces, and the output line extends from a corner portion between the first outer surface and the third outer surface of the casing. The photoelectric switch according to claim 13 , wherein the photoelectric switch extends outside the casing. The casing further includes a fourth outer surface facing the third outer surface;
15. The photoelectric switch according to claim 14 , further comprising a display unit that is provided on the fourth outer surface of the casing and displays information related to a detection state of the processing means. The photoelectric switch according to claim 13 , wherein the display unit is configured to be able to switch and display a plurality of types of information related to the processing of the processing unit.

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