JP2014127456A - Multi-optical axis photoelectric sensor and seal member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-optical axis photoelectric sensor capable of surely maintaining water-tightness between mutually opposite circumferential surfaces of an opening end portion of a transparent cylindrical case in which an optical unit forming a plurality of optical axes is accommodated, and an encapsulation member mounted to the opening end portion, and a seal member appropriately used for the multi-optical axis photoelectric sensor.SOLUTION: The multi-optical axis photoelectric sensor comprises: a transparent cylindrical case 22; an optical unit 16 inserted into the cylindrical case and forming a plurality of optical axes; an end cap 25 including a bottomed cylindrical fitting part 120 of which the outer circumferential surface opposes an inner circumferential surface of an opening end portion of the cylindrical case via a gap, while being mounted to the opening end portion; and an elastic annular seal ring 24 interposed between the opposite circumferential surfaces of the opening end portion of the cylindrical case and the fitting part of the end cap. The seal ring includes a first annular part 131 of which the contour shape at an inner circumferential side is nonlinear, and a second annular part 132 of which the sectional area connected to an outer circumferential side of the first annular part is larger than the first annular part, in a sectional shape orthogonal with a circumferential direction.

Description

  The present invention relates to a multi-optical axis photoelectric sensor used for, for example, a light curtain that detects an intruder, and a seal member suitably used for the multi-optical axis photoelectric sensor.

  Conventionally, a multi-optical axis photoelectric sensor has a watertight structure that prevents liquid from entering a long cylindrical translucent member in which optical units that form a plurality of optical axes are accommodated (for example, , See Patent Document 1). That is, the optical unit in the multi-optical axis photoelectric sensor is accommodated in a long cylindrical metal casing having a window portion for forming an optical axis in a state where the optical unit is accommodated in a translucent member that is an example of a cylindrical case. Has been. Moreover, the cover body which has the sealing member which seals the opening edge part of a translucent member watertightly is being fixed to the edge part of metal housings. And the O-ring which is an example of a cyclic | annular sealing member is interposed in the clearance gap between the mutually opposing peripheral surfaces of the opening edge part of a translucent member, and a sealing member.

JP 2009-272064 A

  By the way, the O-ring is often integrally molded by heat vulcanization compression molding using a mold divided into an upper mold and a lower mold. Therefore, the molded O-ring may have a burr that extends thinly along the die mating surface. Such burrs extend so as to form a ring over the entire circumferential direction on both the inner and outer peripheral sides of the O-ring. Therefore, when such O-rings with burrs are interposed in the gaps between the circumferential surfaces facing each other between the translucent member, which is a transparent cylindrical case, and the sealing member attached to the opening end thereof. There is a possibility that the sealing performance becomes insufficient and the watertightness between the translucent member and the sealing member cannot be maintained.

  The present invention has been made in order to solve the above-described problems, and the object thereof is to provide an opening end portion of a transparent cylindrical case in which an optical unit forming a plurality of optical axes is accommodated, and the opening end portion thereof. An object of the present invention is to provide a multi-optical axis photoelectric sensor and a seal member that can reliably maintain water tightness between the circumferential surfaces facing each other with a sealing member to be attached.

  A multi-optical axis photoelectric sensor that solves the above problems includes a transparent cylindrical case formed in a cylindrical shape, and a plurality of optical axes that are inserted into the cylindrical case and perpendicular to the axial direction of the cylindrical case. An optical unit that forms an opening, and is attached to the opening end to seal the opening end of the cylindrical case in which the optical unit is inserted, and in the attached state, a peripheral surface of the opening end A sealing member having a bottomed cylindrical fitting portion whose peripheral surfaces oppose each other through a gap, and between the peripheral surfaces facing each other between the opening end portion of the cylindrical case and the fitting portion of the sealing member An annular sealing member having elasticity interposed therebetween, and the sealing member has a non-linear outline shape on the inner peripheral side in a cross-sectional shape when cut along a plane orthogonal to the circumferential direction. The first annular portion and the cross-sectional area connected to the outer peripheral side of the first annular portion is the first annular portion. A second annular portion that is larger than the second annular portion, and in a state of being interposed between the circumferential surfaces facing each other, the second annular portion is displaced relative to the first annular portion. The pressure is sandwiched between the circumferential surfaces facing each other.

  According to this configuration, when the seal member is interposed between the circumferential surfaces facing each other between the opening end portion of the cylindrical case and the fitting portion of the sealing member, the seal member is The two annular portions are displaced so as to tilt with the first annular portion on the inner peripheral side as a fulcrum, and the second annular portion faces the opening end portion of the cylindrical case and the fitting portion of the sealing member. It is pinched between the peripheral surfaces. Therefore, even if the sealing member is manufactured by mold molding, even if it has burrs along the die mating surface on the inner peripheral side and the outer peripheral side, such a burr portion is clamped. The possibility that watertightness cannot be maintained can be avoided.

  In the multi-optical axis photoelectric sensor, the seal member may have a circular cross-sectional shape of the first annular portion and a circular cross-sectional shape of the second annular portion. The shape is symmetrical with respect to a straight line connecting the diameter center of the portion and the diameter center of the second annular portion.

  According to this configuration, when the sealing member is interposed between the circumferential surfaces facing each other between the opening end portion of the cylindrical case and the fitting portion of the sealing member, the second annular portion on the outer peripheral side is Even when tilted in any direction with the first annular portion on the inner peripheral side as a fulcrum, the same pinched state is obtained, so that the water tightness can be maintained satisfactorily.

  Further, in the multi-optical axis photoelectric sensor, the sealing member is attached by fitting the fitting portion from the inside to the opening end portion of the cylindrical case, and the sealing member is The cylindrical case is interposed between the inner peripheral surface of the opening end portion and the outer peripheral surface of the fitting portion of the sealing member.

  According to this configuration, the annular seal member is mounted in advance on the outer peripheral surface of the fitting portion of the sealing member, and the fitting portion of the sealing member is fitted inside the opening end portion of the cylindrical case. Therefore, the assembly work of the multi-optical axis photoelectric sensor can be easily performed. Moreover, after the assembly is completed, there is no step on the outer peripheral surface of the opening end portion of the cylindrical case, unlike when the fitting portion of the sealing member is fitted to the opening end portion of the cylindrical case from the outside. Therefore, it can suppress that a sealing member detaches carelessly from the opening edge part of a cylindrical case, when an object hits from the part exterior of such a level | step difference.

  Moreover, the sealing member that solves the above problem is an annular sealing member having elasticity, and the inner peripheral side contour shape is non-linear in a cross-sectional shape when cut along a plane orthogonal to the circumferential direction. A first annular portion, and a second annular portion having a cross-sectional area coupled to an outer peripheral side of the first annular portion, which is larger than the first annular portion.

  According to this configuration, the multi-optical axis photoelectric sensor can be suitably used as a sealing member interposed between the mutually facing peripheral surfaces of the opening end portion of the cylindrical case and the fitting portion of the sealing member. it can.

  According to the present invention, between the opening surfaces of the transparent cylindrical case in which the optical units forming the plurality of optical axes are accommodated and the circumferential surfaces facing each other of the sealing member attached to the opening ends. The water tightness between them can be reliably maintained.

The perspective view which shows typically the light curtain of one Embodiment. The perspective view of a light receiver. The disassembled perspective view of a light receiver. The perspective view which looked at the element block from the upper part. The perspective view which looked at the element block from the lower part. The perspective view which looked at the shield case from the upper part. The perspective view which looked at the shield case from the lower part. The perspective view of a control board and an element board. The perspective view of a control board and an element board. The perspective view which looked at the shield case where the element block, the control board, and the element board were assembled | attached from the upper direction. The perspective view which looked at the shield case where the element block, the control board, and the element board were assembled | attached from the downward direction. FIG. 12 is a cross-sectional view taken along line 12F-12F in FIG. (A) is a perspective view of an end fixture, (b) is a front view of the end fixture, (c) is a rear view of the end fixture, (d) is a plan view of the end fixture, (e) ) Is a bottom view of the end fixing bracket, and (f) is a side view of the end fixing bracket. The disassembled perspective view of the fixing structure of the shield case with respect to a cylindrical case. (A) is a perspective view of a seal ring, (b) is a front view of the seal ring, (c) is a plan view of the seal ring, (d) is a side view of the seal ring, and (e) is a cross-sectional view of the seal ring. Sectional drawing of the fixing structure of the shield case with respect to a cylindrical case. It is drawing which shows an effect | action at the time of attaching an end cap to a cylindrical case, Comprising: (a) is sectional drawing which shows the state which fitted the seal ring to the end cap, (b) is the state shown to Fig.17 (a) Sectional drawing which shows the state which inclined the seal ring diagonally from (c), (c) is sectional drawing which shows the state which assembled | attached the end cap to the cylindrical case from the state shown in FIG.17 (b). 18F-18F arrow directional cross-sectional view of FIG. Sectional drawing of the light receiver of the state which the translucent surface of the cylindrical case contacted the flat ground.

Hereinafter, an embodiment of a multi-optical axis photoelectric sensor will be described with reference to the drawings.
As shown in FIG. 1, the light curtain 11 includes a projector 12 that is an example of a multi-optical axis photoelectric sensor, and a light receiver 13 that is also an example of a multi-optical axis photoelectric sensor that is paired with the projector 12. Yes. The light projector 12 has a plurality of light projecting elements 14 arranged in a line. On the other hand, the light receiver 13 has a plurality of light receiving elements 15 arranged in a line. The light projector 12 and the light receiver 13 are arranged at positions facing each other across a predetermined detection region so that the light projecting element 14 and the light receiving element 15 are paired with each other to form the optical axis L. The light projector 12 and the light receiver 13 detect the presence / absence of an object in the detection region by performing a light projecting / receiving operation on each optical axis L between the light projecting element 14 and the light receiving element 15 that make a pair. Do. The light projector 12 and the light receiver 13 have substantially the same basic structure except for some structural differences such as whether the photoelectric element is a light projecting element or a light receiving element. Therefore, hereinafter, the light receiver 13 will be described as an example of the multi-optical axis photoelectric sensor.

  2 and 3, the light receiver 13 includes a plurality of (three in the present embodiment) element blocks 20 and a shield case 21 as an example of a housing case that covers these element blocks 20 from the outside. Have. The light receiver 13 includes a transparent cylindrical case 22 having a long cylindrical shape into which the shield case 21 is inserted from the inside, end fixing brackets 23 attached to both ends in the longitudinal direction of the cylindrical case 22, A seal ring 24 and an end cap 25 are further provided. That is, the light receiver 13 is formed by housing the optical unit 16 formed by assembling the element block 20 in the shield case 21 in the cylindrical case 22.

  As shown in FIG. 4, the element block 20 has a shape that is long in one direction, and the element block 20 is formed on the first end face 20 </ b> A (upper face in FIG. 4) that is one end face in the optical axis direction X. Is formed in the optical axis direction X. These light-transmitting holes 28 are arranged at regular intervals in a line along the longitudinal direction of the first end face 20 </ b> A of the element block 20. Further, these light transmission holes 28 are arranged at the center position in the width direction intersecting the longitudinal direction on the first end face 20 </ b> A of the element block 20. A lens 29 as an example of an optical member is held at the opening edge of each element hole 20 on the first end face 20A side of the element block 20. That is, the element block 20 functions as an example of a holding member that holds the lens 29. Each lens 29 has a flat light-transmitting surface exposed to the outside of the element block 20. The center position of the translucent surface of each lens 29 is located on the center line of the light transmission hole 28. Further, the translucent surface of each lens 29 is disposed at a position deeper than the first end surface 20 </ b> A of the element block 20.

  In the vicinity of a part of the light transmission holes 28 on the first end face 20A of the element block 20, a semi-disc-shaped protrusion 30 protrudes at two positions spaced apart in the width direction of the first end face 20A of the element block 20. It is installed. These protrusions 30 secure a gap between the first end face 20 </ b> A of the element block 20 and the inner surface of the cylindrical case 22, so that the translucent surface of the lens 29 collides with the inner surface of the cylindrical case 22. It is regulated.

  The first end face 20A of the element block 20 is provided with an LED substrate 33 on which LEDs 32 functioning as an example of a plurality (seven in this embodiment) of display elements are mounted. The LED board 33 has a comb-like shape and extends in the longitudinal direction of the first end face 20 </ b> A of the element block 20. The LED substrate 33 is cylindrical with respect to the first end face 20 </ b> A of the element block 20 located in the middle of the three element blocks 20 arranged side by side in the longitudinal direction of the cylindrical case 22 and the element block 20. It extends between the first end face 20 </ b> A of the element block 20 adjacent to both sides in the longitudinal direction of the shaped case 22.

  A connector 36 is mounted on one end side of the LED substrate 33 in the longitudinal direction (right end side in FIG. 4). In addition, one LED 32 is mounted at the tip of each part extending from a plurality of positions in the longitudinal direction on the LED substrate 33. Each LED 32 is disposed at an intermediate position between adjacent lenses 29 in the longitudinal direction of the element block 20. Each LED 32 is disposed at the center position in the width direction on the first end face 20 </ b> A of the element block 20.

  A light guide plate 38 having a comb-like shape is laminated on the mounting surface of the LED substrate 33 on which the LEDs 32 are mounted. The light guide plate 38 is made of a transparent resin material, and is elongated in the longitudinal direction of the first end face 20A of the element block 20. The light guide plate 38 is provided with a plurality of (four in the present embodiment) fitting portions 41 at intervals in the longitudinal direction of the light guide plate 38. The fitting portion 41 is fitted with a fitting protrusion 42 provided in a portion corresponding to the fitting portion 41 in the longitudinal direction of the light guide plate 38 in the first end surface 20A of the element block 20. Note that an insertion hole (not shown) passes through the LED board 33 at a position corresponding to the fitting protrusion 42 in the longitudinal direction of the LED board 33, and the fitting protrusion 42 protruding from the LED board 33 through the insertion hole. Is fitted to the fitting portion 41 of the light guide plate 38. Further, the LED substrate 33 and the light guide plate 38 are disposed in a gap formed between the first end surface 20 </ b> A of the element block 20 and the inner surface of the cylindrical case 22 by the protrusion 30.

  As shown in FIG. 5, in the element block 20, two boss portions 45 as an example of a cylindrical convex portion are provided on the second end surface 20B which is the end surface opposite to the first end surface 20A in the optical axis direction X. Projected vertically. These boss portions 45 have the same amount of protrusion from the second end surface 20B of the element block 20. Further, the second end surface 20B of the element block 20 has openings on the second end surface 20B side of the light transmission holes 28 formed at equal intervals in the longitudinal direction of the second end surface 20B. The boss portions 45 are disposed between the light transmission holes 28 adjacent in the longitudinal direction of the second end surface 20B of the element block 20. In other words, each boss portion 45 is disposed at an intermediate position between adjacent lenses 29 in the longitudinal direction of the first end surface 20A of the element block 20 in a plan view as viewed from the optical axis direction X. A female screw hole 46 is recessed in the optical axis direction X at the tip surface of each boss portion 45.

  In addition, a columnar protrusion 50 is vertically provided on the third end face 20 </ b> C which is an end face along the optical axis direction X in the element block 20. The protrusion 50 is disposed at a position closer to the center than the boss portion 45 in the longitudinal direction of the third end face 20C of the element block 20 and at a center position in the optical axis direction X on the third end face 20C of the element block 20. ing. The protrusion amounts of the protrusions 50 provided on the third end surfaces 20C of all the element blocks 20 are equal to each other.

  As shown in FIG. 6, the shield case 21 has a shape that is long in one direction like the element block 20, and a cross section in which one surface side in the optical axis direction X is opened as a light passing window 60 that is an example of a light transmitting portion. It is substantially U-shaped and is made of a metal material having high shielding performance against electromagnetic waves having a specific frequency.

  The both side wall portions 61 of the shield case 21 are thinner at the first portion 61A located on the light passage window 60 side than the second portion 61B located on the bottom wall portion 62 side of the shield case 21. On the inner side surface of both side wall portions 61 of the shield case 21, a stepped portion 63 extending inward of the shield case 21 at the boundary portion between the first portion 61 </ b> A and the second portion 61 </ b> B is provided in the longitudinal direction of the shield case 21. It extends over the whole area. In addition, rectangular locking holes 64 are formed at both ends in the longitudinal direction of the shield case 21 in the first portions 61 </ b> A of the side wall portions 61 in the shield case 21. These locking holes 64 have the same height from the bottom wall portion 62 of the shield case 21.

  As shown in FIG. 7, on the outer surface of the bottom wall portion 62 of the shield case 21, a groove 65 as an example of a rectangular recess extends over the entire length of the shield case 21. A plurality (six in this embodiment) of through-holes 66 that penetrate the bottom wall portion 62 of the shield case 21 in the thickness direction are opened on the inner bottom surface of the recess 65. The through holes 66 are arranged at equal intervals in the longitudinal direction of the shield case 21, and are arranged at positions corresponding to the boss portions 45 in the longitudinal direction of the second end face 20 </ b> B of the element block 20. That is, the interval between the through holes 66 adjacent in the longitudinal direction of the shield case 21 is equal to the interval between the boss portions 45 adjacent in the longitudinal direction of the second end surface 20B of the element block 20.

  The recess 65 is formed by pressing the bottom wall portion 62 of the shield case 21 from the outside of the shield case 21. Therefore, on the inner surface of the bottom wall portion 62 of the shield case 21, a ridge 67 having a rectangular shape having a width dimension similar to that of the ridge 65 extends over the entire region in the longitudinal direction of the shield case 21. .

  As shown in FIG. 8, the control board 70 that comprehensively controls the operation of the light receiver 13 is a rectangular thin plate in which the surface 71 on which the CPU 74 is mounted extends long in one direction like the element block 20 and the shield case 21. I am doing. In addition, a concave concave portion as an example of a plurality of (four in the present embodiment) first concave portions is formed at one end (lower side in FIG. 8) of the short side direction of the control board 70. 72 is recessed so as to cut out to the other side (upper side in FIG. 8) in the short direction. These recesses 72 are recessed at equal intervals in the longitudinal direction of the surface 71.

  Of the surface 71 of the control board 70, the first surface portion 71 </ b> A in which the concave portion 72 is formed in the longitudinal direction is more than the second surface portion 71 </ b> B in which the concave portion 72 is not formed in the longitudinal direction. Short dimension in short direction. That is, in the second surface portion 71B, the end of the first surface portion 71A on the same side as the side where the concave portion 72 is provided is more than the end portion of the first surface portion 71A on the side where the concave portion 72 is provided. The convex part 73 of the convex shape as an example of the 1st convex part which protruded to the one side (FIG. 8 lower side) in the transversal direction of the surface 71 is comprised. Further, the surface portion located at the center in the longitudinal direction of the surface 71 of the control board 70 is a second surface portion 71B in which the concave portion 72 is not provided, and this second surface portion 71B is a kind of mounted component. The CPU 74 is mounted. That is, the CPU 74 is mounted at the same position as the convex portion 73 in the longitudinal direction of the surface 71 of the control board 70. The CPU 74 extends over substantially the entire region of the second surface portion 71B of the surface 71 in the short direction.

  A connector 75 is mounted on the surface portion of the surface 71 of the control board 70 on the first direction side in the longitudinal direction (left side in FIG. 8). The connector 75 is electrically connected to the connector 36 provided on the LED substrate 33 via a wire harness (not shown). A connector 76 is mounted on a surface portion of the surface 71 that is closer to the second direction side in the longitudinal direction (right side in FIG. 8).

  Note that circular fitting holes 77 penetrate through a plurality of (three in the present embodiment) positions in the longitudinal direction on the surface 71 of the control board 70. In these fitting holes 77, projections 50 provided on the third end face 20 </ b> C of the element block 20 are fitted from the back side opposite to the surface 71 of the control board 70. Therefore, the control board 70 is positioned with respect to the third end surface 20 </ b> C of the element block 20 in the direction along the surface 71.

  An element substrate 80 on which the light receiving element 15 is mounted is assembled to the end of the surface 71 of the control substrate 70 on the recess 72 side. The element substrate 80 has a rectangular thin plate shape in which the surface 81 on which the light receiving element 15 is mounted extends in one direction similarly to the control substrate 70. The longitudinal dimension of the surface 81 of the element substrate 80 is slightly longer than the longitudinal dimension of the surface 71 of the control substrate 70. Further, the dimension in the short direction of the surface 81 of the element substrate 80 is slightly shorter than the dimension in the short direction of the surface 71 of the control board 70. The surface 71 of the control substrate 70 and the surface 81 of the element substrate 80 are orthogonal to each other (that is, intersecting at right angles) with the longitudinal directions of both surfaces 71 and 81 being coincident.

  A concave portion 82 as an example of a plurality of second concave portions having a rectangular shape is formed in an end portion intersecting with the control substrate 70 on the surface 81 of the element substrate 80 so as to be cut inward in the short direction. These concave portions 82 are recessed at positions corresponding to the positions where the convex portions 73 are formed in the longitudinal direction of the surface 71 of the control substrate 70 in the longitudinal direction of the element substrate 80. In the end portion of the surface 81 of the element substrate 80 where the concave portion 82 is provided, the surface portion where the concave portion 82 is not provided is shorter than the surface portion where the concave portion 82 is provided. The convex part 83 as an example of the 2nd convex part which protruded in the direction is comprised.

  In a state where the control substrate 70 and the element substrate 80 are assembled with the surfaces 71 and 81 being orthogonal to each other, the convex portion 83 of the element substrate 80 is fitted into the concave portion 72 of the control substrate 70 and the convex portion 73 of the control substrate 70. Is fitted into the recess 82 of the element substrate 80. In this state, the tip of the convex portion 83 of the element substrate 80 slightly protrudes from the surface 71 of the control substrate 70, and the tip of the convex portion 73 of the control substrate 70 is the back surface opposite to the surface 81 of the element substrate 80. It protrudes slightly from the side. The width dimension in the longitudinal direction of the surface 81 in the recess 82 of the element substrate 80 is substantially equal to the width dimension in the longitudinal direction of the surface 71 in the projection 73 of the control board 70. Further, the width dimension in the longitudinal direction of the surface 81 in the convex portion 83 of the element substrate 80 is substantially equal to the width dimension in the longitudinal direction of the surface 71 in the concave portion 72 of the control substrate 70.

  As shown in FIG. 9, a plurality (12 in this embodiment) of light receiving elements 15 are mounted on the surface 81 of the element substrate 80 at equal intervals in the longitudinal direction of the surface 81. These light receiving elements 15 are arranged over the entire area in the longitudinal direction of the surface 81 including both longitudinal ends of the surface 81. Further, these light receiving elements 15 are disposed at positions corresponding to the light transmission holes 28 in the longitudinal direction of the second end face 20B of the element block 20. That is, the interval between the light receiving elements 15 adjacent in the longitudinal direction of the surface 81 is equal to the interval between the light passing holes 28 adjacent in the longitudinal direction of the second end surface 20B of the element block 20.

  A plurality of (11 in this embodiment) circular insertion holes 85 pass through the surface 81 of the element substrate 80 between the light receiving elements 15 adjacent in the longitudinal direction of the surface 81. These insertion holes 85 are arranged at positions corresponding to the boss portions 45 provided on the second end surface 20B of the element block 20 in the longitudinal direction of the second end surface 20B of the element block 20. The diameters of these insertion holes 85 are larger than the outer diameter of the boss portion 45 of the element block 20.

  A connector 86 is mounted on the end of one side (left side in FIG. 9) in the longitudinal direction of the surface 81 of the element substrate 80. The connector 86 is electrically connected to a connector 76 mounted on the surface 71 of the control board 70 via a wire harness (not shown).

  As shown in FIG. 10, the element block 20, the control board 70, and the element board 80 are accommodated in the shield case 21 through openings at both ends of the shield case 21. In this case, the longitudinal direction of the element block 20 coincides with the longitudinal direction of the shield case 21. The element block 20 is accommodated in the shield case 21 with the first end face 20 </ b> A provided with the lens 29 slightly protruding from the light passage window 60. The dimension in the longitudinal direction of the shield case 21 is approximately the same as the total length of all the element blocks 20 connected in the same direction.

  Further, as shown in FIG. 11, a fixing screw 90 is inserted from the outside of the shield case 21 into the through hole 66 formed in the bottom wall portion 62 of the shield case 21. The head of the fixing screw 90 is accommodated in a recess 65 provided in the bottom wall portion 62 of the shield case 21, and does not protrude from the end surface where the recess 65 is not provided in the bottom wall portion 62. The fixing screw 90 fixes the element block 20 to the shield case 21.

  As shown in FIG. 12, the element substrate 80 is supported from the back surface side opposite to the surface 81 with respect to the stepped portion 63 provided on the inner surface of the both side wall portions 61 of the shield case 21. In the insertion hole 85 of the element substrate 80, the boss portion 45 of the element block 20 is inserted in the optical axis direction X from the surface 81 side. The tip portion of the boss portion 45 is inserted in the optical axis direction X with respect to the through hole 66 formed in the bottom wall portion 62 of the shield case 21. Therefore, the female screw hole 46 recessed in the tip surface of the boss portion 45 is exposed to the outside of the shield case 21 through the through hole 66. In this case, since the boss portion 45 is inserted to a position halfway through the through hole 66, the optical axis direction X is between the tip surface of the boss portion 45 and the opening edge of the through hole 66 outside the shield case 21. There are some gaps in the space.

  The shaft portion of the fixing screw 90 is screwed in the optical axis direction X from the outside of the shield case 21 into the female screw hole 46 of the boss portion 45. Therefore, the element block 20 is fixed to the shield case 21 via the element substrate 80 supported by the step portion 63 of the shield case 21. The element substrate 80 is sandwiched between the element block 20 and the stepped portion 63 of the shield case 21 in the optical axis direction X.

  Further, the surface 81 of the element substrate 80 is disposed so as to intersect the optical axis direction X at a right angle in a state where the longitudinal direction of the surface 81 coincides with the longitudinal direction of the shield case 21 and the element block 20. The light receiving element 15 mounted on the surface 81 of the element substrate 80 is disposed on the center line of the light transmission hole 28 provided in the element block 20. On the other hand, the surface 71 of the control board 70 orthogonal to the surface 81 of the element substrate 80 is such that the longitudinal direction of the surface 71 coincides with the longitudinal directions of the shield case 21 and the element block 20 and the short direction of the surface 71 is the optical axis direction. They are arranged along the optical axis direction X in a state where they coincide with X.

  As shown in FIG. 3, the cylindrical case 22 has a substantially rectangular annular section, and is a light-transmitting resin that is highly light-transmitting with respect to light projected and received between the light projecting element 14 and the light receiving element 15. It is formed by. In addition, on the translucent surface 100 (upper surface in FIG. 3), which is the outer surface of the side wall portion facing the light passage window 60 of the shield case 21 among the side wall portions of the cylindrical case 22, a groove 101 as an example of a concave portion is provided. Is recessed. The recess 101 extends over the entire length of the cylindrical case 22. Further, the longitudinal dimension of the cylindrical case 22 is slightly longer than the longitudinal dimension of the shield case 21. Therefore, gaps for accommodating the end fixing bracket 23, the seal ring 24, the end cap 25, and the like are set at both ends in the longitudinal direction of the cylindrical case 22.

  As shown in FIGS. 13A to 13F, the end fixing bracket 23 is made of a metal material whose overall shape is substantially U-shaped, and the bottom plate 110 has a circular shape in two places. A female screw hole 111 is formed. Further, both side plate portions 112 of the end fixing bracket 23 have the same shape, and are bent vertically with both ends of the bottom plate portion 110 as base ends. The both side plate portions 112 face each other with a distance similar to the distance between the first portions 61 </ b> A provided with the locking holes 64 in the side wall portions 61 of the shield case 21. Further, a hollow portion 113 having a substantially U shape is cut out in each side plate portion 112 in the thickness direction of the side plate portion 112 with the lower portion of the U shape as a base end side. Further, a linear hollow portion 114 having the same width dimension as the hollow portion 113 reaches a substantially central position in the height direction of the side plate portion 112 at the center position in the width direction on the front end surface of each side plate portion 112. Is cut out. As a result, each side plate portion 112 has a base end side as a fixed end and extends toward the front end side, and an elastic piece having a cantilever shape with an end portion folded back from the middle position to the base end side as a free end. A portion 115 is formed. The elastic piece 115 has a constant width dimension from the fixed end to the free end. A locking claw 116 is formed at the free end of the elastic piece 115 by being bent and raised toward the outside of the end fixing bracket 23.

  As shown in FIG. 14, the end fixing bracket 23 is attached to the shield case 21 by the locking claw 116 being locked to the locking hole 64 from the inside of the shield case 21. The shield case 21 to which the end fixing bracket 23 is attached is accommodated in the cylindrical case 22 through openings at both ends in the longitudinal direction of the cylindrical case 22. In this case, the end fixing bracket 23 is attached to the shield case 21 from the opening end side in the longitudinal direction of the cylindrical case 22. In addition, the elastic piece 115 of the end fixing bracket 23 extends from the base end side in the direction opposite to the opening end in the longitudinal direction of the cylindrical case 22 and is folded back from the midway position toward the opening end side. It extends towards the side. And the opening edge part of the both ends of the longitudinal direction of the cylindrical case 22 which accommodated the shield case 21 is sealed with a pair of end cap 25 as an example of a sealing member.

  The end cap 25 is made of a resin material. The fitting portion 120 is fitted from the inside to the opening end portions at both ends of the cylindrical case 22, and the fitting portion 120 is fitted to the opening end portion of the cylindrical case 22. And a gripping part 121 to be gripped when mating. The fitting portion 120 has a rectangular bottomed cylindrical shape having an outer edge shape substantially the same as the opening shape of the opening end portion of the cylindrical case 22. The grip 121 has an outer edge shape that is substantially the same as the outer edge shape of both ends in the longitudinal direction of the cylindrical case 22. When the fitting portion 120 of the end cap 25 is fitted to the opening end portion of the cylindrical case 22, the outer peripheral surface of the fitting portion 120 and the inner peripheral surface of the opening end portion of the cylindrical case 22 are The grip part 121 is locked by both longitudinal end faces of the cylindrical case 22 so as to face each other through a gap and so that the outer surface of the grip part 121 is flush with the outer surface of the cylindrical case 22. .

  In the holding part 121, the insertion hole 122 penetrates the end surface 121 a exposed to the outside of the cylindrical case 22 when the fitting part 120 of the end cap 25 is fitted into the cylindrical case 22. A power cable (not shown) for supplying power to the control board 70, the element board 80, and the mounting components mounted on the LED board 33 is inserted into the insertion hole 122. In addition, a packing 123 that seals between the outer peripheral surface of the power cable and the inner peripheral surface of the insertion hole 122 is mounted around the insertion hole 122.

  A plurality (two in this embodiment) of screw insertion holes 124 pass through the end surface 121a of the grip portion 121. Each screw insertion hole 124 is arranged on the same straight line extending in the longitudinal direction of the cylindrical case 22 with respect to the female screw hole 111 of the corresponding end fixing bracket 23. The shaft portion of the fixing screw 126 is inserted in the longitudinal direction of the cylindrical case 22 from the outer side of the cylindrical case 22 through the screw insertion hole 124 toward the inner side of the cylindrical case 22. Further, the distal end of the shaft portion of the fixing screw 126 is screwed into the female screw hole 111 of the end fixing bracket 23 accommodated in the cylindrical case 22. As a result, the end cap 25 is fixed to the shield case 21 via the end fixing bracket 23 by fixing the end cap 25 to the end fixing bracket 23 with the fixing screw 126. That is, the end fixing bracket 23 functions as an example of an attachment member that attaches the end cap 25 to the shield case 21. A cylindrical bush 128 is fitted into the screw insertion hole 124 in which the fixing screw 126 is inserted so as to cover the head of the fixing screw 126 from the outside of the end cap 25.

  An annular concave groove 129 is formed over the entire region in the outer peripheral direction of the fitting portion 120 on the outer surface of the end portion inserted into the inner back side of the cylindrical case 22 in the fitting portion 120. A rectangular ring-shaped seal ring 24 is fitted into the concave groove 129 from the outside. That is, the seal ring 24 is a gap between the inner peripheral surface of the opening end portion of the cylindrical case 22 and the outer peripheral surface of the fitting portion 120 of the end cap 25, that is, the opening end portion of the cylindrical case 22 and the end cap. It is interposed in a compressed state between the circumferential surfaces facing each other with the 25 fitting portions 120.

  As shown in FIGS. 15A to 15E, the seal ring 24 includes a first annular portion 131 having a rectangular annular shape, and a second annular portion 132 having a rectangular annular shape slightly larger than the first annular portion 131. And has a double ring structure in which the outer peripheral surface of the first annular portion 131 and the inner peripheral surface of the second annular portion 132 are connected. The first annular portion 131 and the second annular portion 132 each have a circular cross-sectional shape in a plane orthogonal to the circumferential direction, and the diameter of the cross-sectional shape of the first annular portion 131 is the second annular portion. It is smaller than the diameter of 132 cross-sectional shape. Therefore, the contour shape on the inner peripheral side of the first annular portion 131 is curved in an arc shape so as to form a non-linear shape. Further, the cross-sectional area of the second annular portion 132 is larger than the cross-sectional area of the first annular portion 131. The diameter center of the cross-sectional shape of the first annular portion 131 and the diameter center of the cross-sectional shape of the second annular portion 132 are located on the same plane along the circumferential direction of both the annular portions 131 and 132. That is, the cross-sectional shape in a plane orthogonal to the circumferential direction of the seal ring 24 is a line based on a straight line connecting the radial center of the cross-sectional shape of the first annular portion 131 and the radial center of the cross-sectional shape of the second annular portion 132. It has a symmetrical shape.

  In addition, the seal ring 24 is elastic between a pair of molds formed by molding a half portion on one side and a half portion on the other side in the thickness direction Z intersecting with a plane along the circumferential direction of both annular portions 131 and 132. After the material is poured, the elastic material is cured after overlapping the opening ends of both molds. Therefore, on the inner peripheral surface of the first annular portion 131 and the outer peripheral surface of the second annular portion 132 in the seal ring 24, part of the elastic material protruding from the opening ends of both molds remains as burrs 133 and 134, respectively. doing. The burr 133 formed on the inner peripheral side of the seal ring 24 has a rectangular annular shape and extends over the entire circumferential direction of the first annular portion 131. Further, the burr 133 on the inner peripheral side is located at a surface portion of the inner peripheral surface of the first annular portion 131 that is the center in the thickness direction Z of the seal ring 24. On the other hand, the burr 134 formed on the outer peripheral side of the seal ring 24 has a rectangular annular shape, and extends over the entire region of the second annular portion 132 in the circumferential direction. Further, the burr 134 on the outer peripheral side is located at a surface portion of the outer peripheral surface of the second annular portion 132 that is the center in the thickness direction Z of the seal ring 24.

  As shown in FIG. 16, the fitting portion 120 to which the seal ring 24 is fitted is fitted from the inside of the cylindrical case 22 through the open ends at both ends in the longitudinal direction of the cylindrical case 22. In this case, the seal ring 24 is interposed between the inner bottom surface of the concave groove 129 of the fitting portion 120 and the inner surface of the cylindrical case 22 with elastic deformation, so that the cylindrical case in which the optical unit 16 is accommodated. The space area inside 22 is sealed in a watertight manner. Further, the seal ring 24 has an inner bottom surface of the recessed groove 129 in the second annular portion 132 in a state where both the first annular portion 131 and the second annular portion 132 are in close contact with the inner bottom surface of the recessed groove 129 of the fitting portion 120. The part opposite to the contact part is in contact with the inner surface of the cylindrical case 22. In the seal ring 24, a surface portion of the inner peripheral surface of the first annular portion 131 that is different from the surface portion where the burr 133 remains is brought into contact with the inner bottom surface of the concave groove 129. The seal ring 24 has a surface portion different from the surface portion where the burr 134 remains on the outer peripheral surface of the second annular portion 132 in contact with the inner surface of the cylindrical case 22. The seal ring 24 is disposed adjacent to the light receiving elements 15 mounted on both ends in the longitudinal direction of the surface 81 of the element substrate 80 in the longitudinal direction of the cylindrical case 22. The arrangement area of the light receiving elements 15 mounted at both ends in the longitudinal direction of the surface 81 of the element substrate 80 overlaps with the arrangement area of the end fixture 23 in the longitudinal direction of the cylindrical case 22.

  Next, a procedure for assembling the multi-optical axis photoelectric sensor configured as described above will be described. In addition, since the procedure at the time of assembling the light projector 12 and the light receiver 13 as an example of a multi-optical axis photoelectric sensor is basically the same, the procedure for assembling the light receiver 13 will be described below as an example.

  When assembling the light receiver 13 of the present embodiment, first, the first end surface of the element block 20 with the first end surfaces 20A of all the element blocks 20 arranged in a line in the longitudinal direction of the element block 20. The fitting protrusion 42 provided on 20 </ b> A is inserted through the insertion hole provided on the LED substrate 33. Further, the tip of the fitting protrusion 42 protruding from the insertion hole of the LED substrate 33 is fitted to the fitting portion 41 provided on the light guide plate 38. Then, the LED substrate 33 and the light guide plate 38 bridge between the first end surfaces 20A of the adjacent element blocks 20.

  Next, the bosses 45 provided on the second end face 20 </ b> B of the element blocks 20 arranged in a line are inserted through the insertion holes 85 of the element substrate 80. In this case, the boss 45 of the element block 20 is inserted into the insertion hole 85 of the element substrate 80 with the surface 81 of the element substrate 80 facing the second end surface 20B of the element block 20. Then, the element substrate 80 is positioned in the direction along the surface 81 of the element substrate 80 by the boss portion 45 of the element block 20. The light receiving element 15 mounted on the surface 81 of the element substrate 80 is disposed on the center line of the light transmission hole 28.

  Subsequently, the protrusion 50 provided on the third end surface 20 </ b> C of the element block 20 is fitted into the fitting hole 77 of the control board 70. Then, the control board 70 is positioned in the direction along the surface 71 of the control board 70 by the protrusions 50 of the element block 20. The surface 71 of the control board 70 is arranged along the third end surface 20C of the element block 20 in a state where the short direction of the surface 71 coincides with the optical axis direction X. In this case, the convex portion 73 provided at the end portion of the control substrate 70 on the element substrate 80 side is inserted into the concave portion 82 provided at the end portion of the element substrate 80 on the control substrate 70 side. In addition, a convex portion 83 provided at an end portion of the element substrate 80 on the control substrate 70 side is inserted into the concave portion 72 provided at the end portion of the control substrate 70 on the element substrate 80 side. And the control board 70 and the element board | substrate 80 cross | intersect mutually orthogonally in the edge part in which the convex parts 73 and 83 and the recessed parts 72 and 82 were provided.

  Next, the element block 20 to which the control board 70 and the element board 80 are assembled is inserted into the shield case 21 through the light passage window 60 provided in the shield case 21. Then, the boss portion 45 of the element block 20 protruding from the insertion hole 85 of the element substrate 80 is inserted into the through hole 66 provided in the bottom wall portion 62 of the shield case 21 from the inside to the outside of the shield case 21. . Then, the element block 20 is positioned with respect to the shield case 21 in a direction intersecting with the protruding direction of the boss portion 45. In this case, the surface of the element substrate 80 opposite to the surface 81 is supported by the stepped portion 63 provided on the inner surface of the side wall portions 61 of the shield case 21. Then, the boss portion 45 of the element block 20 is inserted to a position halfway through the through hole 66 of the shield case 21.

  Subsequently, a fixing screw 90 is inserted from the outside of the shield case 21 into the through hole 66 of the shield case 21 in which the boss portion 45 of the element block 20 is inserted. Then, the shaft portion of the fixing screw 90 is screwed into the female screw hole 46 of the boss portion 45 exposed to the outside of the shield case 21 through the through hole 66. Then, the boss portion 45 of the element block 20 is pulled outside the shield case 21 in the optical axis direction X by the fixing screw 90. The element block 20 is fixed to the shield case 21 via the element substrate 80 supported by the step portion 63 of the shield case 21. Further, the element substrate 80 is sandwiched in the optical axis direction X between the element block 20 and the stepped portion 63 of the shield case 21.

  In this case, since the boss portion 45 is inserted to the middle position of the through hole 66, it is allowed to be slightly displaced toward the outside of the shield case 21 along the optical axis direction X through the through hole 66. The Therefore, even if there is an error in the thickness dimension of the element substrate 80 in the optical axis direction X, the element substrate 80 is securely sandwiched between the element block 20 and the shield case 21 in the optical axis direction X.

  The element block 20 is fixed to the shield case 21 by being pulled in the optical axis direction X by the fixing screw 90. Therefore, the central axis of the lens 29 held by the element block 20 is inclined from a desired direction as compared with the conventional configuration in which the element block 20 is pulled from both sides in the direction orthogonal to the optical axis direction by two fixing screws. It is hard to tilt. Further, since the number of fixing screws used for fixing the element block 20 to the shield case 21 is reduced, it contributes to an improvement in the assembly of the light receiver 13 and a reduction in size and weight of the light receiver 13. .

  The element block 20 is fixed to the bottom wall portion 62 of the shield case 21 with a fixing screw 90. Therefore, compared to the conventional configuration in which the element block 20 is fixed to the side wall portion 61 of the shield case 21 by a fixing screw, the rigidity required for the side wall portion 61 of the shield case 21 is low. As a result, the thickness dimension of the side wall 61 of the shield case 21 is thinner than that of the conventional configuration. Therefore, the dimension in the short direction of the shield case 21 is reduced as compared with the conventional configuration. As a result, the width dimension of the light receiving surface of the light receiver 13 is reduced.

  Next, the end fixing metal fittings 23 are inserted into the shield case 21 from both longitudinal sides of the shield case 21. Then, while the elastic piece 115 of the end fixture 23 is elastically deformed so as to fall inside the shield case 21, the locking claw 116 formed at the tip of the elastic piece 115 is formed on the side wall 61 of the shield case 21. It slides in the longitudinal direction of the shield case 21 with respect to the inner surface. And when the latching claw 116 reaches the formation position of the latching hole 64 formed in the both ends of the longitudinal direction of the shield case 21, the elastic piece part 115 will face toward the outer side of the shield case 21 based on the elastic restoring force. Deform. As a result, the locking claw 116 of the end fixing bracket 23 is locked by the locking hole 64 of the shield case 21, so that the end fixing bracket 23 is attached to the shield case 21.

  In this case, the end fixture 23 has an elastic piece 115 whose free end located on the distal end side can be elastically deformed with a fixed end located on the proximal end side as a fulcrum, and on the distal end side of the elastic piece 115. A locking claw 116 is provided. Therefore, a large stroke amount of the locking claw 116 accompanying the elastic deformation of the elastic piece portion 115 is ensured. Therefore, when locking the locking claw 116 of the end fixing bracket 23 to the locking hole 64 formed in the shield case 21, a large external force is not required to displace the locking claw 116, The locking claw 116 is easily locked with respect to the locking hole 64.

  Further, the elastic piece 115 extends from the base end side in a direction opposite to the opening end in the longitudinal direction of the shield case 21, and is folded from the middle position toward the opening end side and extends toward the distal end side. Therefore, compared with the case where the entire region from the base end side to the tip end side of the elastic piece portion 115 extends from the open end side in the longitudinal direction of the shield case 21 toward the inner back side of the shield case 21, The amount of the elastic piece 115 entering the back side is reduced. As a result, even if the end fixing bracket 23 and the control board 70 are configured not to overlap with each other in the longitudinal direction of the shield case 21 in order to prevent the end fixing bracket 23 from interfering with the control board 70, the control board 70. A large dimension in the longitudinal direction of the shield case 21 is ensured. Therefore, the size of the surface 71 of the control board 70 is sufficiently secured.

  The end fixing bracket 23 is disposed so as to overlap the element block 20 and the element substrate 80 in the longitudinal direction of the shield case 21. The lens 29 held by the element block 20 and the light receiving element 15 mounted on the element substrate 80 are disposed in the vicinity of the opening end in the longitudinal direction of the shield case 21. As a result, the size of the region where the optical axis L is not formed at both ends in the longitudinal direction of the shield case 21 is reduced.

  Further, as compared with the case where the end fixing bracket 23 is fixed to the shield case 21 by screwing, a fixing screw for fixing the end fixing bracket 23 to the shield case 21 is not required. This also contributes to the improvement of the assemblability and the size and weight of the light receiver 13.

  Subsequently, the shield case 21 to which the end fixing bracket 23 is attached is inserted into the inside of the cylindrical case 22 from the open end portions formed at both ends in the longitudinal direction of the cylindrical case 22. In this case, the shield case 21 is inserted inside the cylindrical case 22 so that the light passage window 60 of the shield case 21 faces the same direction as the light transmitting surface 100 of the cylindrical case 22. Then, in the end fixing bracket 23, the female screw holes 111 formed in the bottom plate portion 110 are exposed to the outside of the cylindrical case 22 through the open end portions at both ends in the longitudinal direction of the cylindrical case 22.

  Then, the end cap 25 is inserted inside the cylindrical case 22 through the open ends at both ends in the longitudinal direction of the cylindrical case 22. In this case, the fitting portion 120 is fitted from the inside of the cylindrical case 22 in a state where the seal ring 24 is fitted from the outside to the concave groove 129 provided in the fitting portion 120 while holding the holding portion 121. Combine.

  That is, as shown in FIG. 17A, first, the inner peripheral surface of the first annular portion 131 in a state where the first annular portion 131 and the second annular portion 132 are arranged in parallel with the inner bottom surface of the concave groove 129. Is brought into contact with the inner bottom surface of the concave groove 129. Then, the burr 133 remaining on the inner peripheral surface of the first annular portion 131 comes into contact with the inner bottom surface of the concave groove 129. Further, the burr 134 remaining on the outer peripheral surface of the second annular portion 132 protrudes from the opening edge of the groove 129. Subsequently, the portion of the second annular portion 132 that protrudes from the opening edge of the groove 129 is pressed from one side in the thickness direction Z of the seal ring 24 (the right side in FIG. 17A).

  Then, as shown in FIG. 17B, the seal ring 24 tilts with the contact portion with the inner bottom surface of the concave groove 129 in the first annular portion 131 as a fulcrum. Then, the second annular portion 132 is brought into contact with the inner bottom surface of the concave groove 129 while maintaining the state where the first annular portion 131 is in contact with the inner bottom surface of the concave groove 129. As a result, the seal ring 24 is arranged in parallel with the first annular portion 131 and the second annular portion 132 inclined obliquely with respect to the inner bottom surface of the concave groove 129. In this case, of the inner peripheral surface of the first annular portion 131, a surface portion different from the surface portion where the burr 133 remains is in contact with the inner bottom surface of the concave groove 129. Therefore, the seal ring 24 contacts the inner bottom surface of the concave groove 129 without a gap.

  Next, as shown in FIG. 17 (c), the fitting portion 120 to which the seal ring 24 is fitted is fitted from the inside of the cylindrical case 22 through the open ends at both ends in the longitudinal direction of the cylindrical case 22. To do. Then, the seal ring 24 brings the surface portion of the outer peripheral surface of the second annular portion 132 that protrudes most from the opening edge of the concave groove 129 into contact with the inner surface of the cylindrical case 22. In this case, of the outer peripheral surface of the second annular portion 132, the surface portion that contacts the inner surface of the cylindrical case 22 is a surface portion that is different from the surface portion where the burr 134 remains. Therefore, the seal ring 24 contacts the inner surface of the cylindrical case 22 without a gap.

  The seal ring 24 is in contact with the inner bottom surface of the groove 129 in the first annular portion 131 because the center diameter of the sectional shape of the first annular portion 131 is smaller than the central diameter of the sectional shape of the second annular portion 132. It is easy to tilt around the site Further, the seal ring 24 is configured such that both the annular portions 131 and 132 are arranged in parallel with the inner bottom surface of the groove 129 and only the first annular portion 131 is in contact with the inner bottom surface of the groove 129. , 132 is inclined obliquely with respect to the inner bottom surface of the groove 129, and the posture in which both annular portions 131, 132 are in contact with the inner bottom surface of the groove 129 is a more stable posture. Therefore, in the seal ring 24, a surface portion different from the surface portion where the burr 134 remains on the outer peripheral surface of the second annular portion 132 is reliably in contact with the inner surface of the cylindrical case 22.

  In particular, in the present embodiment, compared to the conventional configuration in which the cylindrical case 22 is pressed from the outside, the cylindrical case 22 and the end cap 25 are easily deformed so as to bulge outward. Relative movement in the longitudinal direction of the cylindrical case 22 is facilitated. However, even if the end cap 25 moves relative to the cylindrical case 22 in the longitudinal direction of the cylindrical case 22, the burr 134 remains on the seal ring 24 on the outer peripheral surface of the second annular portion 132. A state where a surface portion different from the surface portion is in contact with the inner surface of the cylindrical case 22 is maintained with high reliability.

  Subsequently, the shaft portion of the fixing screw 126 is inserted into the inside of the cylindrical case 22 from both longitudinal ends of the cylindrical case 22 through the screw insertion holes 124. Then, the shaft portion of the fixing screw 126 inserted inside the cylindrical case 22 is screwed into the female screw hole 111 of the end fixing bracket 23. Then, the shield case 21 is connected to the cylindrical case 22 via the end fixing bracket 23 and the end cap 25. As a result, the element block 20 and the element substrate 80 are fixed to the cylindrical case 22 together with the shield case 21. The lens 29 held by the element block 20 and the light receiving element 15 mounted on the element substrate 80 are fixed so as not to move relative to the cylindrical case 22.

  Thereafter, the bush 128 is fitted into the screw insertion hole 124 into which the fixing screw 126 is inserted so as to cover the head of the fixing screw 126 from the outside of the end cap 25, thereby completing the assembly of the light receiver 13.

  Next, the operation of the multi-optical axis photoelectric sensor configured as described above will be described. Since the operations of the projector 12 and the light receiver 13 as an example of the multi-optical axis photoelectric sensor are basically the same, the operation of the light receiver 13 will be described below as an example.

  Now, the CPU 74 mounted on the control board 70 requires a large mounting space in the vertical and horizontal directions compared to other mounting parts mounted on the control board 70. Therefore, the dimension in the short direction of the surface 71 of the control board 70 is longer than the dimension in the short direction of the surface 81 of the element substrate 80 which is an example of a substrate on which the CPU 74 is not mounted.

  In this regard, in the present embodiment, the control board 70 is arranged along the optical axis direction X in a state where the short direction of the surface 71 of the control board 70 is aligned with the optical axis direction X. Therefore, compared with the case where the surface 71 of the control board 70 is arranged so as to be orthogonal to the optical axis direction X, the installation space of the control board 70 in the direction orthogonal to the optical axis L is reduced.

  In order to collect the light forming the optical axis L by the lens 29, it is necessary to leave a predetermined interval between the light receiving element 15 and the lens 29. Therefore, the dimension of the light receiver 13 in the optical axis direction X must be optically increased to some extent. Therefore, even if the control board 70 is arranged along the optical axis direction X, the short dimension of the control board 70 is shorter than a predetermined interval required between the light receiving element 15 and the lens 29. In this case, the installation space of the light receiver 13 in the optical axis direction X is hardly increased by arranging the control board 70 along the optical axis direction X. Therefore, by arranging the control board 70 along the optical axis direction X, the installation space of the light receiver 13 can be saved.

  As shown in FIG. 18, in this embodiment, the LED 32 mounted on the LED substrate 33 is in the optical axis direction X with respect to the center position in the width direction perpendicular to the longitudinal direction of the light transmitting surface 100 of the cylindrical case 22. It is arrange | positioned on the same straight line extended in. Further, the LED 32 protrudes from the first end face 20 </ b> A on the lens 29 side in the element block 20. The LED 32 emits light over a wide angle range R from the center position in the width direction on the light transmitting surface 100 of the cylindrical case 22 toward both sides in the width direction. The cylindrical case 22 is made of a transparent resin material, and the entire cylindrical case 22 is translucent with respect to light emitted from the LED 32. Therefore, the light emitted from the LED 32 is emitted outside the cylindrical case 22 over a wide angular range R without providing a cutout or the like in the cylindrical case 22. And the light inject | emitted from LED32 is easily visually recognized from the both sides of the width direction in the translucent surface 100 of the cylindrical case 22. FIG. Therefore, even if the operator is positioned in any direction in the width direction of the light transmitting surface 100 with respect to the light receiver 13, the light emitted from the LED 32 is easily visually recognized by the operator, so that the optical axis Adjustment work is easily performed.

  In particular, in the present embodiment, the LEDs 32 are arranged on the same straight line extending in the optical axis direction X with respect to the center position in the longitudinal direction of the light transmitting surface 100 of the cylindrical case 22. Therefore, when the cylindrical case 22 is arranged vertically with the longitudinal direction aligned with the vertical direction, any one of the one end and the other end in the longitudinal direction of the cylindrical case 22 is arranged upward. Even if it is a case, LED32 is arrange | positioned in the center position of the height direction of the cylindrical case 22. FIG. Therefore, the light emitted from the LED 32 is easily visually recognized by the operator, so that the operation of adjusting the optical axis is further simplified.

  As shown in FIG. 19, in the present embodiment, light is received by the light receiving element 15 mounted on the element substrate 80 through the lens 29 held by the element block 20 in the light transmitting surface 100 of the cylindrical case 22. The surface portion 100 </ b> A located on the optical axis L of light is the inner bottom surface of the concave strip 101 provided on the light transmitting surface 100 of the cylindrical case 22. That is, the surface part 100 </ b> A located on the optical axis L of the light transmitting surface 100 of the cylindrical case 22 is recessed more than the other surface parts where the concave stripes 101 are not formed on the light transmitting surface 100 of the cylindrical case 22. It is out. Therefore, even if the cylindrical case 22 tilts and the light transmitting surface 100 of the cylindrical case 22 collides with the flat ground G, the surface located on the optical axis L of the light transmitting surface 100 of the cylindrical case 22. The part 100A is unlikely to collide with the ground G. Therefore, by avoiding damage to the surface portion 100A located on the optical axis L in the light transmitting surface 100 of the cylindrical case 22, scattering of light constituting the optical axis L is suppressed.

According to the present embodiment, the following effects can be obtained.
(1) The control board 70 that requires a large mounting space for the CPU 74 vertically and horizontally is arranged along the optical axis direction X. Therefore, the installation space of the control board 70 in the direction orthogonal to the optical axis L is reduced as compared with the case where the control board 70 is arranged so as to be orthogonal to the optical axis L. In order to collect the light that forms the optical axis L by the lens 29, it is necessary to provide a predetermined interval between the light projecting element 14 and the light receiving element 15 that form the optical axis L and the lens 29. Originally, the size of the projector 12 and the light receiver 13 in the optical axis direction X is optically large to some extent. For this reason, even if the control board 70 is arranged along the optical axis direction X, an increase in the installation space of the projector 12 or the light receiver 13 in the optical axis direction X is thereby suppressed. Therefore, the installation space of the projector 12 and the light receiver 13 can be saved.

  (2) The element substrate 80 is disposed so as to intersect the optical axis direction X. Therefore, compared to the case where the element substrate 80 and the control substrate 70 are arranged side by side along the optical axis direction X, the installation space for the control substrate 70 and the element substrate 80 in the optical axis direction X is reduced. Therefore, an increase in the installation space of the projector 12 and the light receiver 13 in the optical axis direction X is suppressed. Therefore, further space saving of the installation space of the projector 12 and the light receiver 13 can be achieved.

  (3) The control board 70 and the element board 80 cross each other. Therefore, the size of the space surrounded by the control substrate 70 and the element substrate 80 is small as compared with the case where the control substrate 70 and the element substrate 80 do not intersect each other. For this reason, the end portions of the control substrate 70 and the element substrate 80 that intersect each other are accommodated in the dead space in the shield case 21, whereby further space saving of the projector 12 and the light receiver 13 can be achieved. Further, the CPU 74 protruding from the surface 71 of the control board 70 is accommodated in a space in the shield case 21 formed by protruding the end of the element substrate 80 intersecting the control board 70 from the control board 70. Therefore, further space saving of the installation space of the projector 12 and the light receiver 13 can be achieved.

  (4) The control board 70 has a rectangular plate shape, and the CPU 74 is mounted at the same position as the convex portion 73 in the longitudinal direction of the control board 70. Therefore, the CPU 74 that requires a relatively large mounting space among the mounted components mounted on the control board 70 is mounted on a portion of the control board 70 having a relatively large dimension in the width direction intersecting the longitudinal direction. Therefore, in the control board 70, the dimension in the width direction of the part where the CPU 74 is not mounted, that is, the part located at the same position as the recess 72 in the longitudinal direction of the control board 70 is smaller than the dimension of the mounting space of the CPU 74 in the same direction. can do. That is, as compared with the case where the CPU 74 is mounted in a portion where the dimension in the width direction intersecting the longitudinal direction of the control board 70 is relatively small, the dimension in the width direction of the portion can be reduced. Therefore, since the dimension of the control board 70 in the width direction can be reduced, the installation space for the projector 12 and the light receiver 13 can be further reduced.

  (5) The control board 70 is disposed so as to be close to the element block 20 in the direction intersecting the optical axis direction X. Therefore, the installation space for the control board 70 and the installation space for the element block 20 are close to each other in the direction intersecting the optical axis direction X. Therefore, the installation space for the projector 12 and the light receiver 13 in the direction intersecting the optical axis direction X is further reduced, so that the installation space for the projector 12 and the light receiver 13 can be further reduced.

  (6) The shield case 21 has a through-hole 66 in which the boss portion 45 of the element block 20 is fitted in the optical axis direction X on the end surface opposite to the end surface located on the optical axis L in the optical axis direction X. Is formed. Therefore, the boss 45 of the element block 20 is fitted in the optical axis direction X with respect to the through hole 66 of the shield case 21, so that the element block 20 intersects the shield case 21 with the optical axis direction X. Can be positioned. Further, the part of the element block 20 opposite to the light passage window 60 can be positioned at one place in the direction intersecting the optical axis direction X with respect to the shield case 21. Therefore, the element block 20 is compared with the shield case 21 in comparison with the configuration in which the part on the light passage window 60 side in the element block 20 is positioned with respect to the shield case 21 at two positions on both sides in the direction intersecting the optical axis direction X. It is possible to reduce the installation space in the direction intersecting the optical axis direction X of the positioning structure that is positioned at the position. Therefore, the installation space of the projector 12 and the light receiver 13 in the direction crossing the optical axis direction X can be saved.

  (7) The element block 20 that holds the lens 29 is connected to the shield case 21 via the end fixing bracket 23 and the end cap 25. Therefore, it is possible to suppress the lens 29 from moving relative to the shield case 21.

  (8) The end fixing bracket 23 has a locking claw 116 that is locked to a locking hole 64 formed in the shield case 21. Therefore, the end fixing bracket 23 can be connected to the shield case 21 by a simple operation.

  (9) The end fixing bracket 23 has an elastic piece 115 whose free end located on the distal end side is elastically deformable with a fixed end located on the proximal end side as a fulcrum, and is engaged with the distal end side of the elastic piece 115. A pawl 116 is provided. Accordingly, a large stroke amount of the locking claw 116 accompanying the elastic deformation of the elastic piece portion 115 is ensured. Therefore, when the locking claw 116 of the end fixing bracket 23 is locked to the locking hole 64 formed in the shield case 21, a large external force is not required to displace the locking claw 116, The locking claw 116 can be easily locked with respect to the locking hole 64.

  (10) The end fixing bracket 23 is attached to the shield case 21 from the opening end side in the longitudinal direction of the cylindrical case 22, and the elastic piece portion 115 is the length of the cylindrical case 22 from the base end side. It extends in the direction opposite to the opening end in the direction, and is folded back from the middle position toward the opening end and extends toward the tip. Therefore, compared with the case where the entire region from the base end side to the tip end side of the elastic piece portion 115 extends from the opening end side in the longitudinal direction of the cylindrical case 22 toward the inner back side of the cylindrical case 22, The amount of the elastic piece 115 entering the inner back side of the case 22 is reduced. Therefore, since the dimension in the longitudinal direction of the cylindrical case 22 on the control board 70 is ensured, a large mounting space for mounting components on the control board 70 can be secured.

  (11) The arrangement region of the end fixing bracket 23 overlaps the arrangement region of the light projecting element 14 and the light receiving element 15 that form the optical axis L in the longitudinal direction of the cylindrical case 22. Therefore, the light projecting element 14 and the light receiving element 15 can be arranged up to the vicinity of the opening end in the longitudinal direction of the cylindrical case 22. Therefore, the size of the area where the optical axis L is not formed at both ends in the longitudinal direction of the cylindrical case 22 can be reduced.

  (12) A female screw hole 46 is recessed in the front end surface of the boss portion 45, and a fixing screw 90 inserted into the through hole 66 from the outside of the shield case 21 is fitted into the through hole 66 from the inside of the shield case 21. It is screwed into the female screw hole 46 of the joined boss part 45. Accordingly, the fixing screw 90 is inserted from the outside of the shield case 21 through the through hole 66 and screwed into the female screw hole 46 of the boss portion 45 of the element block 20 in the optical axis direction X, thereby shielding the element block 20. The case 21 can be fastened in the optical axis direction X.

  (13) An element substrate 80 on which the light projecting element 14 or the light receiving element 15 that forms the optical axis L is interposed between the element block 20 and the shield case 21, and the boss portion 45 is formed on the element substrate. The insertion hole 85 formed in 80 is inserted in the optical axis direction X. Accordingly, the fixing screw 90 is inserted through the insertion hole 85 of the element substrate 80 and screwed into the female screw hole 46 of the boss portion 45 of the element block 20 in the optical axis direction X, so that the element substrate 80 is fixed to the element block 20. And the shield case 21 can be fastened in the optical axis direction X.

  (14) The boss portion 45 is inserted from the inside of the shield case 21 to the middle position of the through hole 66. Accordingly, when the fixing screw 90 is inserted through the through hole 66 from the outside of the shield case 21 and screwed into the female screw hole 46 of the boss portion 45 in the optical axis direction X, the boss portion 45 is inserted into the through hole by the fixing screw 90. It is displaced to the outside of the shield case 21 through 66. Therefore, for example, even if there is an error in the thickness dimension of the element substrate 80 in the optical axis direction X, the element substrate 80 can be reliably sandwiched between the element block 20 and the shield case 21 in the optical axis direction X.

  (15) A groove 65 is formed on the end surface of the shield case 21 opposite to the light passage window 60, and the through-hole 66 is open on the inner surface of the groove 65. Therefore, since the head of the fixing screw 90 exposed to the outside of the shield case 21 is accommodated in the recess 65, the head of the fixing screw 90 protrudes from the end surface of the shield case 21 opposite to the light passage window 60. This can be suppressed.

  (16) The outer surface located on the optical axis L in the cylindrical case 22 is a translucent surface 100 through which light forming the optical axis L is transmitted, and the LED 32 is a central position in the longitudinal direction of the translucent surface 100. In addition, the light transmitting surface 100 is arranged on the same straight line extending in the optical axis direction X with respect to the center position in the direction intersecting the longitudinal direction. Therefore, when the cylindrical case 22 is arranged vertically with the longitudinal direction aligned with the vertical direction, any one of the one end and the other end in the longitudinal direction of the cylindrical case 22 is arranged upward. Even if it is a case, LED32 is arrange | positioned in the center position of the height direction of the cylindrical case 22. FIG. Further, the LED 32 emits light from the center position in the width direction intersecting the longitudinal direction of the light transmitting surface 100. Therefore, the light emitted from the LED 32 is easily visually recognized from both sides of the translucent surface 100 in the width direction. Therefore, the operator can easily perform the optical axis adjustment work based on the light emitted from the LED 32 from the longitudinal center position on the light transmitting surface 100. Moreover, the cylindrical case 22 has translucency that transmits light emitted from the LED 32. Therefore, the light can be emitted from the LED 32 toward the outside of the cylindrical case 22 without providing a cutout or the like for allowing the light from the LED 32 to pass through.

  (17) The LED 32 protrudes from the first end face 20 </ b> A on the lens 29 side in the element block 20. Therefore, the LED 32 emits light over a wide angular range R from the first end surface 20A on the lens 29 side in the element block 20. Therefore, the operator can more easily visually recognize the light emitted from the LED 32, so that the operation of adjusting the optical axis can be performed more simply.

  (18) The outer surface located on the optical axis L in the cylindrical case 22 is a translucent surface 100 through which light forming the optical axis L is transmitted, and the surface located on the optical axis L in the translucent surface 100. A concave stripe 101 is formed in the portion 100A. Therefore, the surface part 100A located on the optical axis L of the light transmitting surface 100 is a surface part through which light forming the optical axis L is transmitted, and this surface part 100A is another surface of the light transmitting surface 100. It is recessed from the part. Therefore, for example, even if the cylindrical case 22 is tilted and the light transmitting surface 100 of the cylindrical case 22 collides with the flat ground G, the surface portion of the light transmitting surface 100 through which the light forming the optical axis L is transmitted. Damage to 100A can be suppressed.

  (19) When the seal ring 24 is interposed between the mutually facing peripheral surfaces of the opening end portion of the cylindrical case 22 and the fitting portion 120 of the end cap 25, the seal ring 24 is The second annular portion 132 is displaced so as to tilt with the first annular portion 131 on the inner peripheral side as a fulcrum, and the second annular portion 132 is a fitting portion between the opening end of the cylindrical case 22 and the end cap 25. The pressure is sandwiched between the circumferential surfaces facing each other. For this reason, even if the seal ring 24 is manufactured by mold molding, even if the seal ring 24 has burrs 133 and 134 along the die-matching surface on the inner peripheral side and the outer peripheral side, It is possible to avoid the possibility that the watertightness cannot be maintained by being pinched.

  (20) In the seal ring 24, the first annular portion 131 has a circular cross-sectional shape, and the second annular portion 132 has a circular cross-sectional shape. The shape is axisymmetric with respect to a straight line connecting the diameter center of the annular portion 132. Therefore, when the seal ring 24 is interposed between the mutually facing peripheral surfaces of the opening end portion of the cylindrical case 22 and the fitting portion 120 of the end cap 25, the second annular portion 132 on the outer peripheral side is formed. Even when tilted in any direction with the first annular portion 131 on the inner peripheral side as a fulcrum, the same pinched state is achieved, so that the water tightness can be maintained well.

  (21) The end cap 25 is attached by fitting the fitting portion 120 into the opening end portion of the cylindrical case 22 from the inside, and the seal ring 24 is located inside the opening end portion of the cylindrical case 22. It is interposed between the peripheral surface and the outer peripheral surface of the fitting portion 120 of the end cap 25 in a state of being pinched. Therefore, after the annular seal ring 24 is mounted in advance on the outer peripheral surface of the fitting portion 120 of the end cap 25, the fitting portion 120 of the end cap 25 is fitted inside the open end of the cylindrical case 22. Therefore, the assembling work of the projector 12 and the light receiver 13 can be easily performed. In addition, unlike the case where the fitting portion 120 of the end cap 25 is fitted from the outside to the opening end portion of the cylindrical case 22 after the assembly is completed, there is a step on the outer peripheral surface of the opening end portion of the cylindrical case 22. Since there is nothing that can be done, it is possible to prevent the end cap 25 from inadvertently coming out of the opening end of the cylindrical case 22 by hitting an object from the outside of such a stepped portion.

In addition, you may change the said embodiment into another embodiment as follows.
In the above embodiment, the control board 70 may be configured such that the CPU 74 is mounted at the same position as the recess 72 in the longitudinal direction of the surface 71.

  In the above-described embodiment, the protrusions 73 and 83 for intersecting the substrates 70 and 80 with each other at the end of the control substrate 70 on the element substrate 80 side and the end of the element substrate 80 on the control substrate 70 side It is good also as a structure which does not provide the recessed parts 72 and 82. FIG.

  In the above embodiment, the element substrate 80 may be arranged along the optical axis direction X. In this case, the element substrate 80 may be provided at a position opposite to the control substrate 70 with the element block 20 interposed therebetween, or is adjacent to each other among a plurality of end faces along the optical axis direction X in the element block 20. You may provide so that it may oppose with respect to two end surfaces.

In the above embodiment, the control board 70 may be arranged such that the surface 71 is inclined with respect to the optical axis L.
In the above embodiment, the recess 65 may not be provided on the outer surface of the bottom wall portion 62 of the shield case 21.

In the above embodiment, the boss portion 45 of the element block 20 may be inserted into the through hole 66 until reaching the opening edge of the through hole 66 to the outside of the shield case 21.
In the above embodiment, the element substrate 80 may omit the insertion hole 85 through which the shaft portion of the fixing screw 90 is inserted. In this case, for example, the shaft portion of the fixing screw 90 may pass outside the outer edge of the surface 81 of the element substrate 80.

In the above embodiment, the female screw hole 46 may be directly provided on the second end surface 20B of the element block 20 without providing the boss portion 45 on the second end surface 20B of the element block 20.
In the above embodiment, the arrangement area of the end fixing bracket 23 and the arrangement area of the light projecting element 14 or the light receiving element 15 do not have to overlap in the longitudinal direction of the cylindrical case 22.

  In the above embodiment, the end fixing bracket 23 has the entire region from the base end side to the tip end side of the elastic piece portion 115 from the opening end side in the longitudinal direction of the cylindrical case 22 to the inner back side of the cylindrical case 22. You may extend toward.

In the above embodiment, the end fixing bracket 23 may be provided with the locking claw 116 at an intermediate position from the base end side to the tip end side of the elastic piece portion 115.
In the above-described embodiment, the end fixing bracket 23 may be directly provided with the locking claw 116 on the outer surface thereof without providing the elastic piece portion 115.

In the above embodiment, the shield case 21 may be directly fixed to the cylindrical case 22 by screwing without providing the end fixing bracket 23.
In the above embodiment, the LED 32 may be provided at a position deeper than the first end face 20 </ b> A of the element block 20.

  -In above-mentioned embodiment, you may comprise the cylindrical case 22 with the material which has non-translucency with respect to the light which LED32 emits. In this case, the cylindrical case 22 may be provided with a notch around the LED 32 in order to emit light emitted from the LED 32 from the cylindrical case 22 within a predetermined angle range.

  -In above-mentioned embodiment, LED32 may be arrange | positioned on the same straight line extended in the optical axis direction X with respect to the position biased to the one side from the center position of the longitudinal direction in the translucent surface 100 of the cylindrical case 22. FIG. Further, the LEDs 32 may be arranged on the same straight line extending in the optical axis direction X with respect to a position deviated from the center position in the width direction on the translucent surface 100 of the cylindrical case 22 to one side.

  In the above embodiment, in place of the concave stripes 101 provided on the light transmitting surface 100 of the cylindrical case 22, concave portions may be provided at a plurality of locations spaced in the longitudinal direction of the cylindrical case 22. Further, the translucent surface 100 of the cylindrical case 22 is configured to be a flat surface, and among the translucent surface 100 of the cylindrical case 22, a surface portion 100A through which light forming the optical axis L is transmitted and other surface portions May be the same.

  -In the said embodiment, even if it employ | adopts the accommodation case which consists of a metal material which does not have shielding performance with respect to the electromagnetic wave of a specific frequency, or a metal material with low shielding performance as an accommodation case which accommodates the element block 20 Good. In this case, a configuration in which each element block 20 is individually covered with a shield member may be employed.

  In the above embodiment, the fitting portion 120 of the end cap 25 may be attached so as to be fitted from the outside to the opening end portion of the cylindrical case 22. Even in this case, the assembly work of the multi-optical axis photoelectric sensor can be easily performed.

  In the above embodiment, the seal ring 24 may have a shape in which the first annular portion 131 and the second annular portion 132 having a non-circular cross-sectional shape in a plane intersecting the circumferential direction are connected. In addition, when the seal ring 24 is configured to tilt the second annular portion 132 with the first annular portion 131 as a fulcrum when the first annular portion 131 is attached to the concave groove 129 of the fitting portion 120, The cross-sectional shape on the plane intersecting the circumferential direction is not necessarily a line-symmetric shape.

  In the above-described embodiment, the seal ring 24 is not necessarily limited as long as the curvature radius of the contour shape on the inner peripheral side is smaller than the curvature radius of the contour shape on the outer peripheral side in the cross-sectional shape in the plane intersecting the circumferential direction. It is not necessary to form a double ring structure in which the two annular portions 131 and 132 are connected. For example, it may have a divergent cross-sectional shape in which the dimension in the width direction intersecting the circumferential direction gradually increases from the inner peripheral side to the outer peripheral side.

  -In the said embodiment, the seal ring 24 does not necessarily need to be a circular arc, if the inner peripheral side outline shape is non-linear in the cross-sectional shape in the surface which cross | intersects the circumferential direction, for example, a bending line It may be a shape.

  -In above-mentioned embodiment, if the seal ring 24 is interposed in the pinched state between the mutually opposing peripheral surfaces of the opening end part of the cylindrical case 22 and the fitting part 120 of the end cap 25, For example, a configuration that does not tilt with the inner peripheral edge as a fulcrum, such as an O-ring, may be used.

In the above embodiment, a multi-optical axis photoelectric sensor may be configured by one element block 20.
In the above embodiment, the multi-optical axis photoelectric sensor may be used for applications other than the light curtain.

Next, a technical idea that can be grasped from the above embodiment and another example will be added below.
(A) a multi-optical axis photoelectric sensor forming a plurality of optical axes,
An optical member provided on the optical axis;
A holding member for holding the optical member;
A storage case for storing the holding member;
In the housing case, the end surface located on the optical axis is provided with a translucent part through which light forming the optical axis is transmitted,
The holding member is provided with a convex portion on the end surface opposite to the light transmitting portion in the optical axis direction,
The housing case is formed with a through-hole in which the convex portion is fitted in the optical axis direction on an end surface opposite to the light transmitting portion in the optical axis direction. Sensor.

  According to the above configuration, the holding member is positioned in the direction intersecting the optical axis direction with respect to the housing case by fitting the convex portion of the holding member to the through hole of the housing case in the optical axis direction. Can do. Further, the part of the holding member opposite to the light transmitting part can be positioned at one place in the direction intersecting the optical axis direction with respect to the housing case. For this reason, the positioning structure for positioning the holding member in the housing case is compared with the structure in which the portion on the light transmitting portion side of the holding member is positioned with respect to the housing case at two positions on both sides in the direction intersecting the optical axis direction. The installation space in the direction crossing the optical axis direction can be reduced. Therefore, the space for installing the multi-optical axis photoelectric sensor in the direction crossing the optical axis direction can be saved.

(B) A female screw hole is recessed in the front end surface of the convex portion,
The above-described technique, wherein a fixing screw inserted into the through hole from the outside of the housing case is screwed into the female screw hole of the convex portion fitted into the through hole from the inside of the housing case. Multi-optical axis photoelectric sensor as described in (b).

  According to the above configuration, the holding screw is inserted into the female screw hole of the convex portion of the holding member in the optical axis direction through the through hole from the outside of the storage case, so that the holding member is attached to the storage case. It can be fastened in the optical axis direction.

(C) An element substrate on which a photoelectric element forming the optical axis is mounted is interposed between the holding member and the housing case.
The multi-optical axis photoelectric sensor according to the technical idea (b), wherein the convex portion is inserted through an insertion hole formed in the element substrate in the optical axis direction.

  According to the above configuration, the fixing screw is inserted in the insertion hole of the element substrate and screwed in the female screw hole of the convex portion of the holding member in the optical axis direction, so that the element substrate is interposed between the holding member and the case. Can be held in the optical axis direction.

(D) The multi-optical axis photoelectric sensor according to the technical idea (b) or (c), wherein the convex portion is inserted from the inside of the housing case to a middle position of the through hole.
According to the above configuration, when the fixing screw is inserted through the through-hole from the outside of the housing case and screwed into the female screw hole of the convex portion of the holding member in the optical axis direction, the convex portion of the holding member is It is displaced to the outside of the housing case through the through hole. Therefore, for example, even if there is an error in the thickness dimension of the element substrate in the optical axis direction, the element substrate can be securely fastened in the optical axis direction between the holding member and the housing case.

(E) a concave portion is formed on the end surface of the housing case opposite to the translucent portion;
The multi-optical axis photoelectric sensor according to any one of the technical ideas (A) to (D), wherein the through hole is opened on an inner surface of the recess.

  According to the above configuration, since the head portion of the fixing screw exposed to the outside of the housing case is housed in the recess, the head portion of the fixing screw is prevented from protruding from the end surface opposite to the light transmitting portion in the housing case. it can.

(F) a multi-optical axis photoelectric sensor forming a plurality of optical axes,
An optical member provided on the optical axis;
A holding member for holding the optical member;
A storage case that holds and holds the holding member;
A cylindrical case that accommodates the storage case and forms a long cylindrical shape having translucency;
A multi-optical axis comprising: a sealing member that seals open end portions formed at both ends in the longitudinal direction of the cylindrical case; and an attachment member that attaches the sealing member to the housing case. Photoelectric sensor.

  According to the above configuration, since the holding member that holds the optical member is connected to the cylindrical case via the housing case, the attachment member, and the sealing member, the optical member moves relative to the cylindrical case. Can be suppressed.

(G) The multi-optical axis photoelectric sensor according to the above technical idea (f), wherein the mounting member has a locking claw locked to a locking hole formed in the housing case. .
According to the said structure, an attachment member can be connected with simple operation with respect to a storage case.

(H) The mounting member has an elastic piece portion whose free end located on the distal end side is elastically deformable with a fixed end located on the proximal end side as a fulcrum,
The multi-optical axis photoelectric sensor according to the above technical idea (g), wherein the locking claw is provided on a distal end side of the elastic piece portion.

  According to the said structure, the stroke amount of the latching claw accompanying the elastic deformation of an elastic piece part is ensured large. Therefore, when locking the locking claw of the mounting member to the locking hole formed in the housing case, a large external force is not required to displace the locking claw, and the locking claw is locked to the locking hole. Can be easily locked.

(Li) The attachment member is attached to the housing case from the opening end side in the longitudinal direction of the cylindrical case,
The elastic piece portion extends from the base end side in a direction opposite to the opening end in the longitudinal direction of the cylindrical case, and is folded from the middle position toward the opening end portion side and extends toward the distal end side. A multi-optical axis photoelectric sensor as described in the above technical idea (h).

  In general, in order that the mounting member does not interfere with the control board, the mounting member and the control board may be configured not to overlap in the longitudinal direction of the cylindrical case. In this case, according to the above configuration, the entire region from the base end side to the tip end side of the elastic piece portion extends from the opening end side in the longitudinal direction of the cylindrical case toward the inner back side of the cylindrical case. Thus, the amount of the elastic piece entering the inner back side of the cylindrical case is reduced. Therefore, since the dimension in the longitudinal direction of the cylindrical case on the control board is ensured, a large mounting space for mounting components on the control board can be ensured.

  (N) The technical idea (f) to (i) above, wherein the mounting region of the mounting member overlaps with a photoelectric device forming region that forms the optical axis in the longitudinal direction of the cylindrical case. The multi-optical axis photoelectric sensor according to any one of the above.

  According to the said structure, a photoelectric element can be arrange | positioned to the vicinity of the opening edge part in the longitudinal direction of a cylindrical case. Therefore, the size of the region where the optical axis is not formed at both ends in the longitudinal direction of the cylindrical case can be reduced.

(Le) a multi-optical axis photoelectric sensor forming a plurality of optical axes,
An optical member provided on the optical axis;
A holding member for holding the optical member;
An LED substrate provided on an end surface of the holding member on the optical member side, on which a display element is mounted;
A cylindrical case that accommodates the holding member and forms a long cylindrical shape having translucency,
The outer surface located on the optical axis in the cylindrical case is a translucent surface through which the light forming the optical axis is transmitted,
The display element is disposed on the same straight line extending in the optical axis direction with respect to the central position in the longitudinal direction of the light transmitting surface and in the direction intersecting the longitudinal direction of the light transmitting surface. A multi-optical axis photoelectric sensor.

  According to the above configuration, when the cylindrical case is arranged vertically with the longitudinal direction aligned with the vertical direction, any one of the one end and the other end in the longitudinal direction of the cylindrical case is upward. Even if it is arrange | positioned, a display element is arrange | positioned in the center position of the height direction of a cylindrical case. Further, the display element emits light from the center position in the width direction intersecting the longitudinal direction on the light transmitting surface. Therefore, the light emitted from the display element is easily visually recognized from both sides of the translucent surface in the width direction. Therefore, the operator can easily perform the optical axis adjustment work based on the light emitted from the display element from the longitudinal center position on the translucent surface. Further, the cylindrical case has translucency that transmits light emitted from the display element. Therefore, light can be emitted from the display element toward the outside of the cylindrical case without providing a cutout or the like for allowing light from the display element to pass through the cylindrical case.

(V) The multi-optical axis photoelectric sensor according to the technical idea (l), wherein the display element protrudes from an end surface of the holding member on the optical member side.
According to the said structure, a display element inject | emits light over a wide angle range from the end surface by the side of the optical member in a holding member. Therefore, the operator can more easily visually recognize the light emitted from the display element, so that the operation of adjusting the optical axis can be performed more simply.

(W) a multi-optical axis photoelectric sensor forming a plurality of optical axes,
An optical member provided on the optical axis;
A holding member for holding the optical member;
A cylindrical case that houses the holding member and has translucency,
The outer surface located on the optical axis in the cylindrical case is a translucent surface through which the light forming the optical axis is transmitted,
A multi-optical axis photoelectric sensor, wherein a concave portion is formed in a surface portion of the light transmitting surface located on the optical axis.

  According to the above configuration, the surface portion located on the optical axis of the light transmitting surface is a surface portion through which light forming the optical axis is transmitted, and this surface portion is more than the other surface portions of the light transmitting surface. Is also recessed. Therefore, for example, even if the cylindrical case tilts and the light transmitting surface of the cylindrical case collides with a flat ground or a wall surface, the surface portion of the light transmitting surface through which the light forming the optical axis is transmitted is damaged. Can be suppressed.

(F) a transparent cylindrical case formed in a cylindrical shape;
An optical unit that is inserted into the cylindrical case and forms a plurality of optical axes in a direction orthogonal to the axial direction of the cylindrical case;
In order to seal the opening end portion of the cylindrical case in which the optical unit is inserted, it is attached to the opening end portion, and in the attached state, the peripheral surface is interposed between the peripheral surface of the opening end portion and a gap. A sealing member having a bottomed cylindrical fitting portion facing;
An annular sealing member having elasticity interposed between the peripheral surfaces of the opening end portion of the cylindrical case and the fitting portion of the sealing member that are opposed to each other. A multi-optical axis photoelectric sensor.

  According to the above configuration, the annular seal member is mounted in advance on the outer peripheral surface of the fitting portion of the sealing member, and the fitting portion of the sealing member is fitted inside the opening end portion of the cylindrical case. Therefore, the assembly work of the multi-optical axis photoelectric sensor can be easily performed.

  DESCRIPTION OF SYMBOLS 12 ... Light projector as an example of a multi-optical axis photoelectric sensor, 13 ... Light receiver as an example of a multi-optical axis photoelectric sensor, 16 ... Optical unit, 22 ... Cylindrical case, 24 ... Seal ring as an example of a sealing member, 25 ... an end cap as an example of a sealing member, 120 ... a fitting part, 131 ... a first annular part, 132 ... a second annular part.

Claims (4)

A transparent cylindrical case formed in a cylindrical shape;
An optical unit that is inserted into the cylindrical case and forms a plurality of optical axes in a direction orthogonal to the axial direction of the cylindrical case;
In order to seal the opening end portion of the cylindrical case in which the optical unit is inserted, it is attached to the opening end portion, and in the attached state, the peripheral surface is interposed between the peripheral surface of the opening end portion and a gap. A sealing member having a bottomed cylindrical fitting portion facing;
An annular seal member having elasticity interposed between the circumferential surfaces facing each other between the opening end portion of the cylindrical case and the fitting portion of the sealing member;
The sealing member is
In a cross-sectional shape when cut along a plane orthogonal to the circumferential direction, a first annular portion whose contour shape on the inner peripheral side is non-linear,
A second annular portion having a cross-sectional area coupled to the outer peripheral side of the first annular portion is larger than the first annular portion;
In the state of being interposed between the circumferential surfaces facing each other, the second annular portion is sandwiched between the circumferential surfaces facing each other with the second annular portion displaced relative to the first annular portion. A multi-optical axis photoelectric sensor.   The seal member has a circular cross-sectional shape of the first annular portion and a circular cross-sectional shape of the second annular portion. In the cross-sectional shape, the radial center of the first annular portion and the second annular portion The multi-optical axis photoelectric sensor according to claim 1, wherein the multi-optical axis photoelectric sensor has a line-symmetric shape with respect to a straight line connecting the center of the diameter.   The sealing member is attached by fitting the fitting portion from the inside to the opening end portion of the cylindrical case, and the sealing member is attached to the inside of the opening end portion of the cylindrical case. The multi-optical axis photoelectric sensor according to claim 1 or 2, wherein the multi-optical axis photoelectric sensor is interposed in a state of being sandwiched between a peripheral surface and an outer peripheral surface of the fitting portion of the sealing member. An annular sealing member having elasticity,
In a cross-sectional shape when cut along a plane orthogonal to the circumferential direction, a first annular portion whose contour shape on the inner peripheral side is non-linear,
A seal member comprising: a second annular portion having a cross-sectional area coupled to an outer peripheral side of the first annular portion, which is larger than the first annular portion.