Photoelectric sensor

Abstract

The invention provides a photoelectric sensor capable of simplifying the assembling process of the photoelectric sensor. The photoelectric sensor includes: a housing having a first outer case and a second outer case attached to each other; a light projection unit that is held in a housing space defined between the first outer case and the second outer case and projects light to the outside; a light receiving unit which is accommodated in the accommodation space and receives light from the outside; a substrate held in the housing space and electrically connected to the light projecting unit and the light receiving unit; and a display held in the accommodation space and having a display unit for displaying information and a flexible wiring electrically connected to the substrate, the first exterior case having: a window unit for exposing the display unit of the display held in the accommodation space to the outside; and a first fixing portion that presses the display held in the accommodation space against one side of the window portion, and the second exterior case has a second fixing portion that presses the display held in the accommodation space against one side of the window portion.

Description

Technical Field

[0001] The present disclosure relates to photosensors. Background Art

[0002] As a conventional photoelectric sensor, the photoelectric switch disclosed in Patent Document 1 is known. This photoelectric switch comprises: a roughly rectangular parallelepiped housing; a display unit mounted on the first surface, the exterior of the housing; a light-emitting unit and a light-receiving unit disposed on a second surface adjacent to the first surface; a receiving unit disposed on the first surface or the display unit and receiving operations; a display control unit that causes the display unit to display a threshold value adjusted by the receiving unit and a signal value representing the amount of light received by the light-receiving unit; a first substrate housed within the housing and connected to the display control unit; and a signal cable connecting the first substrate and the display unit. The first surface has a hole-like or notch-like opening for passing the signal cable from the exterior of the housing to the interior, and the signal cable is connected to the first substrate via the opening.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-061886

[0006] Problems to be solved by the invention

[0007] Photoelectric sensors seek miniaturization and cost reduction. Furthermore, simplifying the assembly process of photoelectric sensors is essential for cost reduction. Patent Document 1 discloses a photoelectric switch as a photoelectric sensor, but does not consider simplifying the assembly process. For example, although the photoelectric switch of Patent Document 1 is provided with a display, the display is located outside the housing. To achieve this, the display signal cable must be guided into the housing through an opening provided on one side of the housing, making simplified assembly processes, particularly automated assembly, difficult. Summary of the Invention

[0008] The present disclosure provides a photoelectric sensor capable of simplifying the assembly process of the photoelectric sensor.

[0009] Means for solving problems

[0010] The photoelectric sensor disclosed herein comprises: a frame having a first outer packaging shell and a second outer packaging shell mounted on each other; a light-projecting portion held in a housing space defined between the first outer packaging shell and the second outer packaging shell for projecting light to the outside; a light-receiving portion held in the housing space for receiving light from the outside; a substrate held in the housing space and electrically connected to the light-projecting portion and the light-receiving portion; and a display held in the housing space, having a display portion for displaying information and a flexible wiring electrically connected to the substrate, the first outer packaging shell having: a window portion for exposing the display portion of the display held in the housing space to the outside; and a first fixing portion for pressing the display held in the housing space against one side of the window portion, the second outer packaging shell having: a second fixing portion for pressing the display held in the housing space against one side of the window portion.

[0011] Effects of the Invention

[0012] According to the present disclosure, the assembly process of the photoelectric sensor can be simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a perspective view of an optical fiber sensor according to an embodiment of the present disclosure.

[0014] Figure 2 It is a three-dimensional diagram of the optical fiber sensor.

[0015] Figure 3 It is a perspective view of the optical fiber holding component.

[0016] Figure 4 This is a perspective view of the optical fiber holding component including the optical fiber holding structure as viewed from one side of the light projection module. Figure 2 (B) Enlarged view of part B.

[0017] Figure 5 This is a perspective view of the optical fiber holding component including the optical fiber holding structure, viewed from the side of the hole into which the optical fiber is inserted.

[0018] Figure 6 It is a perspective view showing the first outer casing and its inner surface.

[0019] Figure 7 It is a plan view showing the first outer casing and its inner surface.

[0020] Figure 8 yes Figure 6 Magnified view of area C.

[0021] Figure 9 It is a perspective view showing the second outer casing and its inner surface.

[0022] Figure 10 It is a plan view showing the second outer casing and its inner surface.

[0023] Figure 11A It is an explanatory diagram for explaining the assembly procedure of the optical fiber sensor, and is a diagram showing the first assembly step.

[0024] Figure 11B It is an explanatory diagram for explaining the assembly procedure of the optical fiber sensor, and is a diagram showing the second assembly step.

[0025] Figure 11C It is an explanatory diagram for explaining the assembly procedure of the optical fiber sensor, and is a diagram showing the third assembly step.

[0026] Figure 11D It is an explanatory diagram for explaining the assembly steps of the optical fiber sensor, and is a diagram showing the fourth assembly step.

[0027] Figure 12 This is a perspective view of the optical fiber sensor viewed from the side of the display cover.

[0028] Figure 13 It is along Figure 12 Cross-sectional view of surface P1.

[0029] Figure 14 It is along Figure 12 Cross-sectional view of surface P2.

[0030] Figure 15 is included Figure 14 A perspective view of a cross section is shown in FIG.

[0031] Figure 16 is included Figure 14 The cross section shown in FIG. 1 is a cross-sectional view illustrating the function of the elastic sheet.

[0032] Figure 17 This is a perspective view of a state in which the first outer casing is removed from the housing of the optical fiber sensor.

[0033] Figure 18 This is a perspective view of the optical fiber sensor viewed from one side of the track stop.

[0034] Description of Reference Signs

[0035] 1: Fiber optic sensor (an example of a photoelectric sensor), 10: Main body, 12: Frame, 12a: Fixing surface, 21: First outer casing, 22: Second outer casing, 24: Display cover (an example of a cover), 27: Track stopper (an example of a fixing member), 28: Display, 28a: Display portion, 28b: Back surface, 28c: Flexible wiring, 28d: Polarizing film, 31: PCB substrate (an example of a substrate), 50: Fiber optic holding component, 51: Main block, 52: Clamping member, 53: Clamping rod, 54: Light projecting module (an example of a light projecting portion), 55: Light receiving module (an example of a light receiving portion), 71: Storage portion, 71a: Storage portion opening, 71b: Storage portion bottom surface, 72: Window portion, 73: Press-fit rib (an example of a first fixing portion), 73a: Ridge line, 73b: Tapered surface, 74: First wall portion, 75: Second wall portion, 75a: Notch portion, 76: Recessed portion, 81: Elastic piece (an example of a second fixing portion). DETAILED DESCRIPTION

[0036] The following description of the embodiments will be described in detail with reference to the accompanying drawings, as appropriate. However, more detailed descriptions than necessary may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially identical structures may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to facilitate a thorough understanding of the present disclosure by those skilled in the art and are not intended to limit the subject matter recited in the claims.

[0037] Figure 1 1 is a perspective view of an optical fiber sensor 1 according to an embodiment of the present disclosure. The optical fiber sensor 1 is an example of a photoelectric sensor that projects light to the outside and receives light from the outside.

[0038] The optical fiber sensor 1 has a thin, box-like shape and has holes 62 and 70 on one side for inserting optical fibers. The optical fiber sensor 1 is configured as follows: corresponding optical fibers are connected to the light-emitting portion and the light-receiving portion, respectively, and the tips of the light-emitting portion and the light-receiving portion are positioned so as to detect the object to be detected. In this example, light emitted from the light-emitting portion propagates through the optical fiber connected to the hole 62 and is emitted from the other end of the optical fiber. The reflected light, which is reflected by the object to be detected, propagates through the optical fiber connected to the hole 70 and is incident on the light-receiving portion. The light incident on the photoelectric conversion element of the light-receiving portion is converted into an electrical signal and amplified by a light-receiving amplifier. The optical fiber sensor 1 then uses a comparator circuit to compare this electrical signal with a given threshold value, for example, to determine the presence of the object to be detected, measure the amount of light received, or perform processing based on the amount of light received.

[0039] Furthermore, coordinates including an X-axis along the longitudinal direction of the optical fiber sensor 1 , a Y-axis along the width direction of the optical fiber sensor 1 , and a Z-axis along the height direction of the optical fiber sensor 1 are defined and used in the following description.

[0040] Figure 2 These are perspective views of a fiber optic sensor. (A) shows the completed product, and (B) shows an exploded view. Figure 3 It is a perspective view of the optical fiber holding component. Figure 4 This is a three-dimensional view of the optical fiber holding component viewed from the side of the light projecting module. Figure 2 (B) Enlarged view of part B. Figure 5 This is a perspective view of the optical fiber holding member as viewed from the side of the hole into which the optical fiber is inserted.

[0041] like Figure 2 As shown in (B), the optical fiber sensor 1 includes a main body 10 and an optical fiber holding member 50. The main body 10 primarily generates and processes electrical signals. It includes a first outer casing 21, a second outer casing 22, an indicator 23, a display cover 24, an outer cover 25, a NET (Network) lens 26, a track stopper 27, a display 28, a shield substrate 29, screws 30, a PCB (Printed Circuit Board) substrate 31, a pin header 32, and a resin cable 33.

[0042] In the main body 10, the indicator 23, track stopper 27, display 28, shield substrate 29, screws 30, and PCB (Printed Circuit Board) substrate 31 are mounted on the first outer housing 21 in the Y-axis direction (the negative Y-axis direction). Subsequently, the second outer housing 22 is mounted on the first outer housing 21. This facilitates automation of the installation process (assembly process) by mounting many components within the main body 10 in a single direction. Furthermore, during installation, at least one of the indicator 23, NET lens 26, track stopper 27, display 28, and PCB substrate 31 can be press-fitted into the first outer housing 21.

[0043] like Figure 3 As shown in FIG. 1 and FIG. 2 , the optical fiber holding member 50 is an integrated module member. Figure 4 Too Figure 2 (B) Enlarged view of part B. Figure 4 as well as Figure 5 As shown, the optical fiber holding component 50 includes a main block 51, a clamping member 52, a clamping rod 53, a light projecting module 54 and a light receiving module 55. Figure 3The perspective view shows a state where the clamp rod 53, the light projecting module 54, and the light receiving module 55 are removed.

[0044] The main block 51 is the main component of the optical fiber holding component 50, and has an insertion hole 62A that constitutes a part of the hole 62 formed inside. In addition, the first outer packaging shell 21 includes a hole for loading the optical fiber holding component 50. The optical fiber holding component 50 presses the hole into the protrusion of the first outer packaging shell 21 for positioning. When installed on the main body 10, the clamping member 52 acts as a cover for one side of the optical fiber sensor 1. In the clamping member 52, an insertion hole 62B that constitutes a part of the hole 62 is formed inside. If the main block 51 and the clamping member 52 are combined, the insertion hole 62A and the insertion hole 62B are connected to form the hole 62. As Figure 1 As shown, the hole 62 is exposed from one side surface of the optical fiber sensor 1 formed by the clamp member 52. The main block 51 contains, for example, a conductive resin.

[0045] A clamping lever 53 is provided at one end of the main block 51. The clamping lever 53 is used to lock the optical fiber after it has been inserted into the holes 62 and 70. When the clamping lever 53 is open (unlocked), the optical fiber is inserted into the holes 62 and 70. When the clamping lever 53 is closed (locked), the optical fiber is secured by friction and cannot be removed from the holes 62 and 70.

[0046] The light projecting module 54 functions as a light projecting unit that projects light onto the optical fiber connected to the hole 62. Figure 5 As shown, the light projecting module 54 includes a lens 57 and an LED (Light Emitting Diode) serving as a light source. Lens 57 is formed from a light-emitting resin 56 and positioned approximately in the center of the light projecting module 54. The LED is mounted on a substrate by soldering or other means and is electrically connected to the light projecting module 54 via a wire. The light receiving module 55 functions as a light receiving unit that receives light from an optical fiber connected to another hole 70 provided in the optical fiber holding member 50.

[0047] Figure 6 It is a perspective view showing the first outer casing 21 and its inner surface. Figure 7 It is a plan view showing the first outer casing 21 and its inner surface. Figure 8 yes Figure 6 The first outer casing 21 is a component that constitutes a portion of the outer surface of the optical fiber sensor 1, and is formed of, for example, a resin. The first outer casing 21 is attached to the second outer casing 22, forming the frame 12 (see FIG. Figure 11D In the frame 12 , a storage space for storing various components of the optical fiber sensor 1 is defined between the first outer casing 21 and the second outer casing 22 .

[0048] For example, Figure 2 As shown in (B) of FIG. 1 , the housing space houses and holds a light projecting module 54 for projecting light to the outside, a light receiving module 55 for receiving light from the outside, and a PCB substrate 31 electrically connected to the light projecting module 54 and the light receiving module 55. The PCB substrate 31 is mounted with electronic components such as a control circuit for processing signals from the light projecting module 54 and the light receiving module 55.

[0049] In addition, the housing space also houses and holds the display 28. The display 28 includes: a display portion 28a for displaying various information; a back surface 28b opposite to the display portion 28a; and a flexible wiring 28c (refer to FIG. 1 ) electrically connected to the PCB substrate 31. Figure 11A The user can check the detection status and operate the optical fiber sensor 1 by checking the messages and numerical values ​​displayed on the display unit 28a. The display unit 28a displays, for example, the amount of incident light, a threshold value for comparison with the incident light amount (e.g., a threshold value for object detection), and information related to the sensor status. The display unit 28a can be a liquid crystal display device, an organic EL (electroluminescence) display device, or the like. The flexible wiring 28c extends from the back surface 28b and is flexible.

[0050] To hold the display 28, the first outer casing 21 includes a housing portion 71 for housing the display and a window portion 72 for exposing the display portion 28a of the display 28 housed in the housing portion 71 to the outside. The housing portion 71 is formed to extend from the inner surface of the first outer casing 21 along the XZ plane in the width direction of the optical fiber sensor 1, that is, in the Y-axis direction.

[0051] Specifically, the storage portion 71 includes a first wall portion 74 and a second wall portion 75 extending in the Y-axis direction. The first wall portion 74 and the second wall portion 75 are plate-shaped members made of resin and formed integrally with the first outer packaging case 21. The first wall portion 74 and the second wall portion 75 are spaced apart from each other and arranged to face each other in the Z-axis direction, which is perpendicular to the Y-axis direction.

[0052] Furthermore, a window 72 is formed in the first wall 74. The window 72 is formed by cutting out a portion of the first wall 74. As will be described later, the display 28 is disposed between the first wall 74 and the second wall 75, and the display portion 28a of the display 28 is exposed to the outside through the window 72.

[0053] like Figure 8As shown, the first outer casing 21 has a press-in rib 73. The press-in rib 73 is a resin member integrally formed with the second wall portion 75. The press-in rib 73 is a convex member that rises from the side of the second wall portion 75 that faces the first wall portion 74 and is opposite to the first wall portion 74. As described later, when the display 28 is stored in the storage portion 71, the press-in rib 73 abuts against the back surface 28b of the display 28, functioning as a first fixing portion that presses the display 28 against one side of the window portion 72.

[0054] Figure 9 It is a perspective view showing the second outer casing 22 and its inner surface. Figure 10 2 is a plan view showing the second outer casing 22 and its inner surface. The second outer casing 22, like the first outer casing 21, is a member constituting a portion of the outer surface of the optical fiber sensor 1 and is formed of, for example, resin.

[0055] The second outer package shell 22 has an elastic piece 81 that extends from the inner surface of the second outer package shell 22 along the XZ plane in the Y-axis direction. The elastic piece 81 is a resin member formed integrally with the second outer package shell 22 and has a predetermined elasticity. As described later, when the first outer package shell 21 and the second outer package shell 22 are installed, the elastic piece 81 abuts against the back surface 28b of the display 28 stored in the storage portion 71 of the first outer package shell 21, and functions as a second fixing portion that presses the display 28 against one side of the window portion 72 and fixes it.

[0056] Figures 11A to 11D It is an explanatory diagram for explaining the assembly procedure of the optical fiber sensor 1 according to the embodiment. Figure 11A This is a diagram of the first assembly process. Figure 11B This is a diagram of the second assembly process. Figure 11C This is a diagram of the third assembly process. Figure 11D This is a diagram of the fourth assembly process. That is, the optical fiber sensor 1 is assembled in accordance with Figure 11A 、 Figure 11B 、 Figure 11C 、 Figure 11D The order of changes.

[0057] like Figure 11A As shown, the PCB substrate 31 and the display 28 and other components are installed in the inner surface of the first outer package shell 21. At this time, the main components are transported along the Y axis direction as shown by the arrow and are arranged on the inner surface of the first outer package shell 21.

[0058] like Figure 11BAs shown, the display 28 is transported along the Y-axis direction as shown by the arrow and is stored in the storage portion 71 of the first outer casing 21. At this time, the flexible wiring 28c of the display 28 passes through the notch 75a provided in the second wall portion 75 (refer to FIG. Figure 6 ), so it won't get in the way of storage.

[0059] like Figure 11C As shown, when the display 28 is completely housed in the housing portion 71 of the first outer casing 21, the display portion 28a of the display 28 is exposed through the window portion 72 of the housing portion 71. The pressing rib 73 abuts against the back surface 28b of the display 28, pressing the display 28 against one side of the window portion 72. The flexible wiring 28c of the display 28 passes through the notch 75a of the second wall portion 75 and is connected to the PCB substrate 31.

[0060] like Figure 11D As shown, the second outer shell 22 is transported along the Y-axis direction and installed on the first outer shell 21, and the frame 12 is completed. At this time, the elastic piece 81 of the second outer shell 22 abuts against the back surface 28b of the display 28, pressing the display 28 against the window portion 72 side.

[0061] Furthermore, the display cover 24 is conveyed along the Z-axis direction as indicated by the arrow and mounted on the housing 12 , thereby completing the optical fiber sensor 1 . Figure 12 This is a perspective view of the completed optical fiber sensor 1 as viewed from the display cover 24 side.

[0062] In the optical fiber sensor 1 according to this embodiment, the first fixing portion, for example, the press-fit rib 73, and the second fixing portion, for example, the elastic sheet 81, press the display portion 28a of the display 28 against the window portion 72. This prevents foreign matter from entering the display portion 28a (display surface) during unexpected events or assembly processes of the optical fiber sensor 1, thereby preventing smooth display of information on the display portion 28a from being obstructed. While the first fixing portion may be a member other than the press-fit rib 73, the press-fit rib 73 is primarily used as an example. Furthermore, the second fixing portion may be a member other than the elastic sheet 81, but the elastic sheet 81 is primarily used as an example.

[0063] Furthermore, the first outer casing 21 and the second outer casing 22 are installed, for example, along the Y-axis direction. Furthermore, since the first wall portion 74 and the second wall portion 75 of the housing portion 71 also extend in the Y-axis direction in which the first outer casing 21 and the second outer casing 22 are assembled, the direction in which the display 28 is stored in the housing portion 71 coincides with the direction in which the first outer casing 21 and the second outer casing 22 are assembled. Consequently, most of the assembly process of the optical fiber sensor 1 can be performed along the Y-axis direction, making it easy to automate the assembly process.

[0064] The first fixing portion may be formed of a pressing rib 73 extending from the second wall portion 75 toward the display 28 (the back surface 28b). This allows the optical fiber sensor 1 to accommodate the display 28 in the accommodating portion 71 and to press the display 28 with a simple structure.

[0065] The second fixing portion can be formed from an elastic sheet 81 extending in the Y-axis direction from the inner surface of the second outer casing 22. This elastic sheet 81 abuts against the display 28 (back surface 28b) at the location of the notch 75a provided in the second wall portion 75. This allows the optical fiber sensor 1 to more reliably press the display 28 using the pressing rib 73 and the elastic sheet 81.

[0066] The flexible wiring 28c of the display 28 may also pass through the notch 75a and be connected to the PCB 31. Thus, the optical fiber sensor 1 can accommodate the display 28 in the housing 61 and connect the display 28 to the PCB 31.

[0067] Figure 13 It is along Figure 12 2 is a cross-sectional view of a plane P1. The plane P1 is a plane along the YZ plane, and corresponds to a partial cross section of the optical fiber sensor 1 at a position near the end of the display 28 in the X-axis direction. Figure 8 The illustrated press-fit rib 73 is disposed at a position corresponding to the vicinity of the end portion of the display 28 in the X-axis direction on the second wall portion 75 .

[0068] Furthermore, another pressing rib 73 is also arranged on Figure 6 That is, at least two press-fit ribs 73 are arranged on the second wall portion 75 at positions corresponding to the vicinities of both ends of the display 28 in the X-axis direction.

[0069] That is, at least two pressing ribs 73 are arranged in the second wall portion 75 at positions corresponding to the vicinity of both ends of the display 28. Thus, the optical fiber sensor 1 can press the display 28 toward the window portion 72 more stably.

[0070] Figure 14 It is along Figure 12 2 is a cross-sectional view of a plane P2. The plane P2 is a plane parallel to the plane P1 and is along the YZ plane. It corresponds to a partial cross section of the optical fiber sensor 1 at a position near the center of the display 28 in the X-axis direction. Figure 15 is included Figure 14 A perspective view of the cross section shown in FIG. Figure 14 as well as Figure 15 As shown, the elastic piece 81 is arranged so as to abut against a substantially central portion of the back surface 28 b of the display 28 .

[0071] Figure 16 Include Figure 14The cross section shown in FIG is a cross section diagram illustrating the function of the elastic piece 81. Figure 11D When the first outer casing 21 and the second outer casing 22 are assembled, the front end protrusion 81a of the elastic sheet 81 contacts the back surface 28b of the display 28 as shown by the dotted line, and the elastic sheet 81 bends toward the side opposite to the display 28. This deflection generates a force acting on the elastic sheet 81 toward the display 28. As a result, the elastic sheet 81 contacts the back surface 28b of the display 28 and presses the display 28 toward the window portion 72.

[0072] That is, the elastic piece 81 is arranged so as to abut against the substantially central portion of the back surface 28b of the display 28, pressing the substantially central portion of the display 28 toward the window 72. In this case, in the optical fiber sensor 1, since the pressing ribs 73 press the vicinity of the two end portions of the display 28 toward the window 72, and the elastic piece 81 presses the substantially central portion of the display 28 toward the window 72, the display 28 can be pressed toward the window 72 more stably.

[0073] The press-fit rib 73 will be further described.

[0074] like Figure 6 as well as Figure 8 As shown, the housing portion 71 is defined between a first wall portion 74 and a second wall portion 75 and includes a housing portion opening 71a for inserting the display 28 along the Y-axis direction, and a housing portion bottom surface 71b located opposite the housing portion opening 71a in the Y-axis direction and positioned on one side of the display 28. This allows the optical fiber sensor 1 to smoothly insert the display 28 into the housing portion 71 along the Y-axis direction.

[0075] Furthermore, a recessed portion 76 recessed in the Y-axis direction is formed on the storage portion bottom surface 71 b , and a press-fit rib 73 is formed on the storage portion bottom surface 71 b at a position corresponding to the recessed portion 76 .

[0076] like Figure 11B As shown, when the display 28 is stored in the storage portion 71, the back surface 28b of the display 28 abuts against the press-in rib 73, particularly the ridge 73a of the press-in rib 73, and moves. The sliding movement between the display 28 and the press-in rib 73 causes the resin press-in rib 73 to wear away from the ridge 73a, and it is expected that shavings will be generated as foreign matter.

[0077] In contrast, since the recess 76 is formed on the housing bottom surface 71b corresponding to the press-in rib 73, the optical fiber sensor 1 can collect shavings generated from the press-in rib 73 as the display 28 is inserted into the recess 76. Consequently, the optical fiber sensor 1 can prevent shavings from entering the display surface, thereby preventing the display of information on the display portion 28a from being obstructed by the shavings.

[0078] In particular, the area of ​​the recess 76 along the XZ plane, which is a plane perpendicular to the Y-axis direction, can be larger than the cross section of the press-fit rib 73 along the XZ plane.

[0079] Furthermore, the pressing rib 73 may be formed so as not to overlap with the window portion 72 in the Y-axis direction. This makes it difficult for shavings generated from the pressing rib 73 to enter the display portion 28a.

[0080] Furthermore, the press-fit rib 73 may have a tapered surface 73b that slopes from the housing opening 71a toward the housing bottom surface 71b in the direction from the second wall portion 75 toward the first wall portion 74. This allows, for example, an apparatus or operator assembling the optical fiber sensor 1 to smoothly insert the display 28 into the housing 71 along the Y-axis direction.

[0081] Furthermore, the recess 78 is formed to have a volume sufficient to accommodate shavings from the press-fit rib 73. For example, the volume of the recess 78 may be the same as the volume of the press-fit rib 73. By properly accommodating the shavings from the press-fit rib 73, it is possible to prevent the display portion 28a from floating due to shavings remaining outside the recess 78 when the display portion 28a is retracted into the housing portion 71, thereby preventing assembly failure caused by shavings remaining outside the recess 78.

[0082] Furthermore, the optical fiber sensor 1 includes a display cover 24 (see FIG. 2 ) that covers a region of the housing 12 including at least the window portion 72 . Figure 12 ). This prevents foreign matter from entering the interior of the housing 12 from the outside through the window 72. The display cover 24 may cover only the display surface of the display 28, or may cover the entire end surface of the optical fiber sensor 1 on the display surface side including the display 28.

[0083] Furthermore, if Figure 16 As shown, a polarizing film 28d having a polarizing effect can be attached to the display portion 28a so as to be present over at least the entire area of ​​the window portion 72. This polarizing film 28d can thereby prevent the formation of a height difference on the surface of the display portion 28a when viewed from the outside, thereby preventing degradation of the appearance of the optical fiber sensor 1 and making it difficult for shavings to propagate onto the display surface. Alternatively, the polarizing film 28d may be omitted.

[0084] Figure 17 This is a perspective view of a state in which the second outer casing 22 is removed from the housing 12 of the optical fiber sensor 1 . Figure 18 1 is a perspective view of the optical fiber sensor 1 as viewed from the side of the track stopper 27 .

[0085] The track stopper 27 is a fixing member, made of resin, for example, for securing the optical fiber sensor 1 to an external member such as a track (not shown). When a user places the fixing surface 12a of the housing 12 against a track extending in the Y-axis direction and inserts the optical fiber sensor 1 into one side of the track, the front end 27a of the track stopper 27 deforms and hooks onto a flange of the track, thereby securing the optical fiber sensor 1 to the track.

[0086] The track stopper 27 is arranged along the Y-axis direction and installed along the Y-axis direction, similarly to the display 28. That is, since the arrangement direction of the track stopper 27 coincides with the direction in which the first outer casing 21 and the second outer casing 22 are assembled, most of the assembly process of the optical fiber sensor 1 can be performed along the Y-axis direction, making it easy to automate the assembly process.

[0087] Thus, the optical fiber sensor 1 of this embodiment arranges the display 28 within the housing 12, eliminating the need for an opening for introducing the flexible wiring 28c of the display 28 from outside the housing 12, nor requiring the flexible wiring 28c to be threaded through the opening. This simplifies the assembly process of the optical fiber sensor 1, allowing, for example, automation of the assembly process. Furthermore, the display cover 24 can be sized to cover the display surface of the display 28, further miniaturizing the optical fiber sensor 1 and reducing the risk of foreign matter adhering to the display surface.

[0088] Furthermore, the frame 12 is split in half to assemble the first and second outer casings 21 and 22, providing a stacked assembly structure for mounting various components in one direction (e.g., the negative Y-axis direction). This simplifies the assembly process of the optical fiber sensor 1, facilitating automation and reducing manufacturing costs. Furthermore, by integrating the press-fit ribs 73 and elastic sheet 81 with the outer casing, the optical fiber sensor 1 eliminates the need for additional fixing components, thereby reducing the number of components. Furthermore, by press-fitting various components, the optical fiber sensor 1 can reduce the number of screws and adhesive fixation required, thereby reducing the management burden of the assembly process.

[0089] While it is difficult to remove shavings generated by the pressing ribs 73 when the display 28 is pressed in, the optical fiber sensor 1 can prevent shavings from entering the display portion of the display surface due to vibration, etc. Therefore, the optical fiber sensor 1 can prevent operators from misreading the display due to poor visibility, or prevent a computer from misrecognizing information contained in an image captured by a camera of the display surface.

[0090] Furthermore, in the optical fiber sensor 1, since the back surface 28b of the display 28 is pressed by the push-in ribs 73 and the elastic sheet 81, the display portion 28a is held in close contact with the member constituting the housing portion 71 (e.g., the first wall portion 74). This prevents shavings from entering and adhering to the display surface of the display 28 housed in the housing portion 71. Specifically, since shavings are less likely to enter the space on the display surface, the display surface is easily visible, allowing operators and cameras to accurately recognize the displayed information.

[0091] Furthermore, by using the elastic sheet 81 and the pressing rib 73 to press the back surface 28b of the display 28, the optical fiber sensor 1 can increase the pressing force on the back surface 28b and reduce the size of the pressing rib 73. For example, the length of the pressing rib 73 along the Y-axis can be minimized. By minimizing the size of the pressing rib 73, the optical fiber sensor 1 can reduce shavings. By reducing shavings, the optical fiber sensor 1 can also reduce the size of the recess 76.

[0092] Furthermore, although there may be variations in the size of the display 28, the optical fiber sensor 1 can press the ribs 73 and the elastic sheet 81 to keep the display portion 28a in close contact with the member constituting the storage portion 71 (e.g., the first wall portion 74) regardless of the variations, thereby suppressing the entry of shavings.

[0093] In this embodiment, an optical fiber sensor 1 is used as an example of a photoelectric sensor, but the present invention is not limited thereto. Photoelectric sensors can be widely used in other sensors that perform optical measurement and detection, such as TOF (Time of Flight) sensors and LiDAR (Light Detection and Ranging).

[0094] While various embodiments have been described above with reference to the accompanying drawings, it is self-evident that the present invention is not limited to these examples. It should be understood that those skilled in the art will be able to devise various variations and modifications within the scope of the claims, and these naturally fall within the technical scope of the present invention. Furthermore, the various components of the above-described embodiments may be arbitrarily combined without departing from the spirit of the invention.

[0095] <Overview of this embodiment>

[0096] As described above, at least the following matters are described in this disclosure: In addition, although corresponding components in the above embodiment are shown in parentheses, the present invention is not limited to these.

[0097] (Item 1)

[0098] The photoelectric sensor (optical fiber sensor 1) comprises: a frame (frame 12) having a first outer packaging shell (first outer packaging shell 21) and a second outer packaging shell (second outer packaging shell 22) mounted on each other; a light projecting portion (light projecting module 54) held in a housing space defined between the first outer packaging shell and the second outer packaging shell for projecting light to the outside; a light receiving portion (light receiving module 55) held in the housing space for receiving light from the outside; a substrate (PCB substrate 31) held in the housing space and electrically connected to the light projecting portion and the light receiving portion; and a display (display display 28), which is held in the housing space and has a display portion (display portion 28a) for displaying information and a flexible wiring (flexible wiring 28c) electrically connected to the substrate, the first outer packaging shell having: a window portion (window portion 72) for exposing the display portion of the display held in the housing space to the outside; and a first fixing portion (press-in rib 73) for pressing the display held in the housing space to one side of the window portion, the second outer packaging shell having: a second fixing portion (elastic sheet 81) for pressing the display held in the housing space to one side of the window portion.

[0099] Thus, the photoelectric sensor arranges the display within the housing space within the housing, eliminating the need for an opening for routing the display's flexible wiring from outside the housing, nor the need to pass flexible wiring 28c through the opening. Consequently, the photoelectric sensor has a structure that simplifies the assembly process, allowing, for example, automated assembly. Furthermore, in the photoelectric sensor, since the first and second fixing portions press the display portion of the display against one side of the window portion, foreign matter is prevented from entering the display surface, thereby preventing interference with the smooth display of information on the display portion.

[0100] (Item 2)

[0101] In the photoelectric sensor described in Item 1, the first outer packaging shell has: a storage portion (storage portion 71) which stores the display, the first outer packaging shell and the second outer packaging shell are installed along the first direction (Y-axis direction), the storage portion has: a first wall portion (first wall portion 74) which extends from the inner surface of the first outer packaging shell toward the first direction; and a second wall portion (second wall portion 75) which is separated from the first wall portion in a second direction different from the first direction and extends from the inner surface of the first outer packaging shell toward the first direction, the display is arranged between the first wall portion and the second wall portion, the window portion is formed on the first wall portion, and the first fixing portion is arranged on the second wall portion.

[0102] Thus, in the photoelectric sensor, since the first and second walls of the storage portion that stores the display also extend in the first direction in which the first and second outer casings are assembled, the direction in which the display is stored in the storage portion coincides with the direction in which the first and second outer casings are assembled. Consequently, most of the photoelectric sensor assembly process can be performed along the first direction, making it easy to automate the assembly process.

[0103] (Item 3)

[0104] In the photoelectric sensor according to item 2, the first fixing portion is a press-fit rib that stands upright from the second wall portion toward the display.

[0105] Thus, the photoelectric sensor can accommodate the display in the accommodating portion and press the display with a simple structure.

[0106] (Item 4)

[0107] In the photoelectric sensor described in item 2 or 3, the second fixing portion is an elastic piece extending from the inner surface of the second outer packaging shell in the first direction and having elasticity, and the elastic piece abuts against the display at the position of the notch portion (notch portion 75a) provided in the second wall portion.

[0108] Thus, the photosensor can more reliably press the display because the photosensor presses the display via the first fixing portion and the second fixing portion.

[0109] (Item 5)

[0110] In the photosensor according to item 4, the flexible wiring of the display passes through the notch portion and is connected to the substrate.

[0111] This allows the photosensor to simultaneously accommodate the display in the housing portion and connect the display to the substrate.

[0112] (Item 6)

[0113] In the photoelectric sensor according to item 4, at least two press-fit ribs are arranged on the second wall portion at positions corresponding to the vicinity of both end portions of the display, and the elastic piece is arranged so as to abut against a substantially central portion of the display.

[0114] This allows the photosensor to more stably press the display against one side of the window.

[0115] (Item 7)

[0116] In the photoelectric sensor described in item 3, the storage portion is defined between the first wall portion and the second wall portion, and has: a storage portion opening (storage portion opening 71a), which is used to insert the display along the first direction; and a storage portion bottom surface (storage portion bottom surface 71b), which is on the opposite side of the storage portion opening in the first direction and on which one side of the display is placed, and a recessed portion (recessed portion 76) concave in the first direction is formed on the storage portion bottom surface, and the press-in rib is formed on the storage portion bottom surface at a position corresponding to the recessed portion.

[0117] Thus, the photoelectric sensor can smoothly insert the display into the storage portion along the first direction and can collect shavings generated from the pressing ribs as the display is inserted into the recessed portion. Thus, the photoelectric sensor can prevent shavings from entering the display surface and preventing the display of information on the display portion from being obstructed by the shavings.

[0118] (Item 8)

[0119] In the photoelectric sensor according to item 7, an area of ​​the recessed portion along a plane perpendicular to the first direction is larger than a cross section of the press-fit rib along the plane.

[0120] Thus, the photoelectric sensor can more reliably collect the chips generated from the pressing ribs into the recessed portion.

[0121] (Item 9)

[0122] In the photoelectric sensor according to item 7, the press-fit rib does not overlap with the window portion in the first direction.

[0123] This makes it difficult for shavings generated from the pressing rib to enter the display portion.

[0124] (Item 10)

[0125] In the photoelectric sensor according to item 7, the press-fit rib has a tapered surface (tapered surface 73 b ) inclined from the housing opening toward the housing bottom surface in a direction from the second wall portion toward the first wall portion.

[0126] Thus, the photosensor can smoothly insert the display into the storage portion along the first direction.

[0127] (Item 11)

[0128] The photoelectric sensor according to any one of items 1 to 10 further includes a cover (display cover 24 ) covering a region of the housing including at least the window portion.

[0129] Thus, the photoelectric sensor can minimize the size of the cover and suppress foreign matter from entering the interior of the housing through the window from the outside of the housing.

[0130] (Item 12)

[0131] In the photosensor according to any one of items 1 to 11, the polarizing film (polarizing film 28 d ) is attached to the display portion so as to be present over at least the entire region of the window portion.

[0132] Thus, in the photosensor, the polarizing film can suppress the formation of a step on the surface of the display portion at a position visible from the outside, thereby suppressing deterioration in the appearance of the photosensor.

[0133] (Item 13)

[0134] The photoelectric sensor according to any one of items 2 to 10 further includes a fixing member (rail stopper 27 ) for fixing the photoelectric sensor to the outside, wherein the fixing member is arranged along the first direction.

[0135] Thus, the arrangement direction of the fixing member coincides with the direction of assembling the first and second outer casings. Therefore, most of the photoelectric sensor assembly process can be performed along the first direction, making it easy to automate the assembly process.

[0136] Industrial applicability

[0137] The present disclosure is useful for photoelectric sensors and the like that can simplify the assembly process of the photoelectric sensors.

Claims

1. A photoelectric sensor comprising: A frame having a first outer packaging shell and a second outer packaging shell mounted on each other; a light projecting unit held in a housing space defined between the first outer casing and the second outer casing and projecting light to the outside; a light receiving portion, held in the receiving space and receiving light from the outside; a substrate held in the receiving space and electrically connected to the light projecting portion and the light receiving portion; and a display held in the housing space and comprising a display portion for displaying information and a flexible wiring electrically connected to the substrate; The first outer packaging shell has: a window portion that exposes the display portion of the display held in the housing space to the outside; and a first fixing portion that presses the display held in the housing space against one side of the window portion; The second outer casing includes a second fixing portion that presses the display held in the storage space toward one side of the window portion.

2. The photoelectric sensor according to claim 1, wherein The first outer casing has a storage portion for storing the display. The first outer packaging shell and the second outer packaging shell are installed along the first direction, The storage portion has: a first wall portion extending from the inner surface of the first outer packaging shell toward the first direction; and a second wall portion, which is spaced apart from the first wall portion in a second direction different from the first direction and extends from the inner surface of the first outer casing toward the first direction; The display is arranged between the first wall portion and the second wall portion, The window portion is formed on the first wall portion, The first fixing portion is arranged on the second wall portion.

3. The photoelectric sensor according to claim 2, wherein: The first fixing portion is a press-fit rib that stands upright from the second wall portion toward the display.

4. The photoelectric sensor according to claim 2 or 3, wherein: The second fixing portion is an elastic piece extending from the inner surface of the second outer casing toward the first direction and having elasticity. The elastic piece contacts the display at a position of the notch portion provided in the second wall portion.

5. The photoelectric sensor according to claim 4, wherein The flexible wiring of the display passes through the notch and is connected to the substrate.

6. The photoelectric sensor according to claim 4, wherein At least two pressing ribs are arranged on the second wall portion at positions corresponding to the vicinity of both ends of the display. The elastic piece is arranged to abut against a substantially central portion of the display.

7. The photoelectric sensor according to claim 3, wherein: The storage portion is defined between the first wall portion and the second wall portion, and includes: a storage portion opening for inserting the display along the first direction; and a storage portion bottom surface, which is on the opposite side of the storage portion opening in the first direction and on which one side of the display is placed. A concave portion concave toward the first direction is formed on the bottom surface of the storage portion, The pressing rib is formed on the bottom surface of the accommodating portion at a position corresponding to the recess.

8. The photoelectric sensor according to claim 7, wherein: An area of ​​the recessed portion along a plane perpendicular to the first direction is larger than a cross section of the press-fit rib along the plane.

9. The photoelectric sensor according to claim 7, wherein: The press-fit rib does not overlap with the window portion in the first direction.

10. The photoelectric sensor according to claim 7, wherein The press-fit rib has a tapered surface that is inclined from the housing portion opening toward the housing portion bottom surface in a direction from the second wall portion toward the first wall portion.

11. The photoelectric sensor according to claim 1 or 2, wherein: The photoelectric sensor further includes a cover covering a region of the frame including the window portion.

12. The photoelectric sensor according to claim 1 or 2, wherein: The polarizing film is attached to the display portion so as to be present over at least the entire area of ​​the window portion.

13. The photoelectric sensor according to claim 2, wherein: The photoelectric sensor further includes a fixing member for fixing the photoelectric sensor to the outside. The fixing member is arranged along the first direction.

Images