JP5065984B2 - Multi-axis photoelectric sensor - Google Patents

Description

  The present invention relates to a multi-optical axis photoelectric sensor used for a light curtain or the like that detects an intruder.

Conventionally, a multi-optical axis photoelectric sensor has a watertight structure that prevents liquid from entering an optical unit for forming a plurality of optical axes. For example, the optical unit of the multi-optical axis photoelectric switch disclosed in Patent Document 1 is made of a long cylindrical metal having a window for forming an optical axis in a state of being accommodated in a long cylindrical translucent member. Housed in a housing. A lid having a sealing member for sealing the opening end of the translucent member in a watertight manner is fixed to the end of the metal casing.
JP 2001-155597 A

  By the way, in the multi-optical axis photoelectric sensor as described above, when heat shrinkage occurs in the translucent member and the resin sealing member, the sealing member moves in a direction of coming out of the translucent member, There is a possibility that the watertightness between the translucent member and the sealing member cannot be maintained.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a multi-optical axis photoelectric device that can reliably maintain the watertightness between the translucent member and the resin sealing member. It is to provide a sensor.

  In order to solve the above problems, the invention according to claim 1 is formed in a cylindrical metal casing having a window portion for forming an optical axis, and in a cylindrical shape longer than the casing. A resin-made translucent member that is inserted into the housing so that both end portions protrude, and an optical unit that is inserted so that both end portions protrude from the translucent member to form a plurality of optical axes. A lid attached to the end of the housing, and the lid is formed in a bottomed cylindrical shape having one end opened so as to accommodate the end of the optical unit so that an optical axis can be formed, In the state which has the resin-made sealing member which seals the opening edge part of the said translucent member watertight, and the window part for optical axis formation, and the said sealing member sealed the said translucent member The sealing member is fixed to the end of the casing so as to cover the sealing member, and the sealing member is prevented from coming out in the longitudinal direction of the casing. That consists of a metallic terminal member, in a state where the terminal member is fixed to the housing, are those having a limiting means for limiting the relative movement of the sealing member and the translucent member.

  In this invention, when the translucent member contracts due to a change in ambient temperature, the regulating means regulates the relative movement between the translucent member and the terminal member. As a result, it is possible to suppress the positional deviation between the sealing member and the opening end of the translucent member. Thereby, the watertightness between a translucent member and a sealing member is maintained.

The invention described in claim 2 has an annular seal member interposed between the opening end of the translucent member and the sealing member.
In this invention, since the annular sealing member for sealing the opening end part of the translucent member is interposed between the opening end part of the translucent member and the sealing member, the translucent member It is possible to reliably maintain the hermeticity of the opening end of the.

  According to a third aspect of the present invention, the sealing member is formed so that an opening end portion of the translucent member can be fitted therein, and the sealing member is formed in the radial direction orthogonal to the longitudinal direction. It is interposed between the opening edge part of this and the said sealing member.

  In this invention, since the sealing member is interposed between the opening end of the translucent member and the sealing member in the radial direction orthogonal to the longitudinal direction, the sealing member is made of resin-made translucent member and sealing member. Even if thermal expansion occurs, it is possible to suppress the formation of a clearance between the translucent member and the sealing member, and it is possible to more reliably maintain the sealing property of the opening end portion of the translucent member.

  The invention according to claim 4 includes an elastic member interposed between the terminal member and the sealing member in the longitudinal direction, and the terminal member fixed to the housing includes the elastic member. The sealing member is pressed in the longitudinal direction.

  In this invention, the sealing member tries to move in the longitudinal direction by a gap for allowing a processing dimensional difference between the metal terminal member and the resin sealing member and a dimensional difference during thermal expansion / contraction, Since the sealing member is pressed toward the translucent member by the elastic member interposed between the terminal member and the sealing member, the longitudinal movement of the sealing member is suppressed, and as a result, the sealing member And displacement of the opening end of the translucent member can be suppressed. Thereby, the watertightness between a translucent member and a sealing member can be reliably maintained. Further, in the gap between the metal terminal member and the resin sealing member, heat generated by a difference in processing dimensions and a coefficient of thermal expansion between the housing and the terminal member, and the translucent member and the sealing member. It is possible not to affect the absorption of the dimensional difference during expansion and contraction.

  The invention according to claim 5 is the cross-sectional shape of the other end portion between the one end portion in the longitudinal direction and the other end portion in the longitudinal direction that seals the opening end portion of the translucent member. Has a step portion that is smaller than the cross-sectional shape of the one end portion, the terminal member has a shape corresponding to the step portion, and the elastic member includes the sealing member and the terminal in the step portion. It is interposed between the members.

  In this invention, an elastic member can be interposed between the metal terminal member and the resin sealing member in the longitudinal direction while maintaining the longitudinal dimension of the multi-optical axis photoelectric sensor.

  Therefore, according to the above-described invention, the water tightness between the translucent member and the resin sealing member can be reliably maintained.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a multi-optical axis photoelectric sensor 1 of the present embodiment. The multi-optical axis photoelectric sensor 1 is, for example, a projector, and is disposed opposite to the multi-optical axis photoelectric sensor functioning as a light receiver to constitute a light curtain or an area sensor. The light curtain or area sensor configured in this way detects an object that blocks the optical axis formed between the projector and the light receiver, depending on whether or not the light is received by the light receiver. The light receiver has substantially the same configuration as the light projector, although there are slight differences such as the photoelectric element provided, and the drawings and description thereof will be omitted.

  As shown in FIG. 1, the multi-optical axis photoelectric sensor 1 has a protective case 11 as a metal housing, and lids 12 are attached to both ends of the case 11. The protective case 11 is made of a metal material (for example, aluminum) and is formed in a long and substantially cylindrical shape. Further, as shown in FIG. 2, the protective case 11 has an optical axis forming window portion 11 a that is formed in a C-shaped cross section and extends along the longitudinal direction at the top. Corner portions on both end faces of the protective case 11 serve as case-side fixing portions 11b for attaching the lid body 12.

  The protective case 11 accommodates a translucent case 13 as a resin translucent member shown in FIG. The translucent case 13 is made of a translucent resin material, is formed in a long cylindrical shape slightly longer than the protective case 11, and the both ends of the translucent case 11 protrude slightly from both ends of the protective case 11. Is housed. As shown in FIG. 1, the translucent case 13 has an upper portion exposed from the window 11a of the protective case 11, and detection light is emitted from the exposed portion to form an optical axis.

  On the outer surface of the translucent case 13, a locking recess 13b is formed as a restricting means. As shown in FIG. 2, the locking recess 13 b is formed in parallel with the opening end 13 a of the translucent case 13. Therefore, the side surface of the locking recess 13b is formed so as to extend along a direction orthogonal to the axial direction (longitudinal direction and the left-right direction in FIG. 3) of the translucent case 13. Note that the optical axis of the multi-optical axis photoelectric sensor 1 is formed so as to extend along the front and back direction in FIG. 3, and the locking recess 13b is formed on a side surface parallel to the optical axis. Furthermore, the locking recess 13b is formed in a groove shape extending along the optical axis direction (the front and back direction in FIG. 3).

  As shown in FIG. 2, the detection device main body 14 is accommodated in the translucent case 13. The detection device main body 14 includes a shield case 21 made of a metal material and an optical unit 22 accommodated and fixed in the shield case 21.

  The shield case 21 is made of a metal material (for example, aluminum), has a long shape having the same length as that of the translucent case 13, and is accommodated so that both end surfaces thereof are aligned with both end surfaces of the translucent case 13. . The shield case 21 has a C-shaped cross section in which an opening 21a for forming an optical axis is formed in the upper part.

  A plurality of optical units 22 are arranged in series inside the shield case 21. Each optical unit 22 has a convex cross-sectional shape, and a plurality of light projecting elements 23 (optical elements) are arranged in a row (see FIG. 3). On the upper surface of the convex portion 24 of each optical unit 22, a light projecting unit 25 that emits light from each light projecting element 23 is provided. The light projecting units 25 of each optical unit 22 arranged in series are linear. A plurality of optical axes aligned with each other are formed. Each optical unit 22 can be electrically connected between adjacent ones. Further, a mounting portion 26 for fixing each optical unit 22 to the shield case 21 is provided on the side surface of the convex portion 24 of each optical unit 22, and the mounting portion 26 and the shield case 21 are fastened and fixed by screws 27. The

  In such a detection device main body 14, the shield case 21 is formed so that the longitudinal dimension thereof is shorter than the total length of the optical units 22 arranged in series. A part of the shield case 21 protrudes from both ends in the longitudinal direction of the shield case 21. That is, a part of the optical units 22 arranged at both ends is configured to protrude from the opening portions (opening end portions 13 a) at both ends of the translucent case 13.

  The lid 12 has a cap 31 as a resin sealing member and a cap cover 41 as a metal terminal member. The cap 31 seals the end of the translucent case 13. The cap cover 41 is fixed to the end of the protective case 11 so as to substantially cover the cap 31 that seals the translucent case 13.

  The cap 31 is made of a resin material having translucency, and has an optical unit housing portion 32 for housing the optical unit 22 and a fitting portion 33 into which the opening end portion 13a of the translucent case 13 is fitted. It has a shape.

  The optical unit housing portion 32 has a shape corresponding to the convex shape of the optical unit 22. As shown in FIG. 3, the accommodating portion 32 accommodates a portion (protruding portion 22 a) that protrudes from the opening end portion 13 a of the light transmitting case 13 in the optical unit 22. The bottom 34 of the optical unit housing portion 32 is in contact with the tip of the protruding portion 22a of the optical unit 22.

  The opening end portion 35 of the optical unit housing portion 32 is formed with a step portion 36 that protrudes outward from both sides in the width direction. The step portion 36 is formed from the opening end portion 35 of the optical unit housing portion 32. After that, it has shifted to the insertion portion 33. In other words, the stepped portion 36 is formed between one end in the longitudinal direction (opening end) that seals the translucent case 13 in the cap 31 and the other end in the longitudinal direction (bottom 34). The other end portion has a step shape such that the cross-sectional shape (cross-sectional shape orthogonal to the longitudinal axis) is smaller than that of one end portion of the cap 31. Each step 36 extends along a direction orthogonal to the longitudinal axis of the multi-optical axis photoelectric sensor 1 and tapers toward the top.

  An annular seal member 51 is interposed between the cap 31 and the translucent case 13 in the radial direction orthogonal to the longitudinal direction, and the open end 13a of the translucent case 13 is sealed by the seal member 51. Has been. Specifically, the fitting portion 33 has a cylindrical shape that is slightly larger than the opening end portion 13 a of the translucent case 13. An annular seal member 51 is interposed between the inner peripheral surface of the fitting portion 33 and the outer peripheral surface of the opening end portion 13 a of the translucent case 13. That is, the seal member 51 is interposed between the opening end portion 13 a of the translucent case 13 and the cap 31 in the radial direction orthogonal to the longitudinal direction. The seal member 51 is in close contact with the outer peripheral surface of the opening end portion 13a and the inner peripheral surface of the fitting portion 33, and the inner space of the translucent case 13 and the cap 31 is sealed in a watertight manner by the seal member 51. .

  As shown in FIG. 1, the cap cover 41 is made of a metal material (for example, an aluminum alloy) and is configured to partially cover the cap 31. As shown in FIG. 2, the cap cover 41 includes first and second cover members 41 a and 41 b that are divided along a plane that passes through the optical axis and is parallel to the longitudinal direction of the multi-optical axis photoelectric sensor 1. . Therefore, the cap cover 41 is formed by fastening both cover members 41a and 41b with fastening members (for example, screws).

  As shown in FIG. 1, an optical axis forming window 42 is formed on the upper portion of the cap cover 41 by separating the cover members 41 a and 41 b, and the upper surface of the cap 31 is exposed from the window 42. . An optical axis is formed on the exposed portion of the cap 31 by light emitted from the light projecting unit 25 of the optical unit 22 inserted in the cap 31. The cap cover 41 has cap-side fixing portions 43 provided corresponding to the case-side fixing portions 11 b of the protective case 11, and is fixed to the protective case 11 by the fixing portions 43. . The fitting portion 33 of the cap 31 is exposed between the fixing portions 43 of the cap cover 41.

  As shown in FIG. 3, the cap cover 41 is formed with a support portion 44 that supports the optical unit housing portion 32 of the cap 31, and each end of the cap 31 is provided at the end of the support portion 44 on the protective case 11 side. Opposing portions 45 are formed opposite to the stepped portions 36 in the longitudinal direction. Each facing portion 45 is parallel to the step portion 36 of the cap 31. In addition, a protruding portion 46 protruding toward the protective case 11 is formed on the outer edge of each facing portion 45. In addition, between the cap 31 and the cap cover 41, such as between the tip of the protruding portion 46 and the fitting portion 33 of the cap 31, or between the bottom portion of the support portion 44 and the bottom portion 34 of the cap 31, a processing dimension difference or heat A gap for allowing a dimensional difference during expansion and contraction is set.

  As shown in FIG. 2, the cap cover 41 is formed with connecting portions 47a and 47b for connecting the tips of the fixing portions 43 on the opening end side. Each connection part 47a, 47b is formed so that the latching recessed part 13b formed in the translucent case 13 may be covered. That is, the first cover member 41 a has a connecting portion 47 a that connects the tips of the fixed portions 43, and the second cover member 41 b has a connecting portion 47 b that connects the tips of the fixed portions 43. As shown in FIG. 3, the cap 31 is configured so that the outer surface of the fitting portion 33 is substantially flush with the side surfaces of the connecting portions 47 a and 47 b in the width direction (vertical direction in FIG. 3) perpendicular to the optical axis. Is formed. Locking convex portions 48a and 48b as restricting means are formed on the inner side surfaces of the connecting portions 47a and 47b, respectively. Both locking projections 48a and 48b are formed so as to extend along the optical axis direction. Then, as shown in FIG. 3, the both locking projections 48 a and 48 b are inserted into the locking recess 13 b of the translucent case 13 by covering the cap 31 with the cap cover 41.

  As shown in FIG. 3, rubber 54 as an elastic member is interposed between a gap set between the cap 31 and the cap cover 41, that is, between the stepped portion 36 of the cap 31 and each facing portion 45 of the cap cover 41. It is intervened. The rubber 54 has a plate shape and a tapered shape corresponding to the stepped portion 36, and is in contact with each stepped portion 36 and each facing portion 45. The rubber 54 is provided symmetrically with respect to the longitudinal axis of the multi-optical axis photoelectric sensor 1. The rubber 54 is positioned by the facing portion 45 of the cap cover 41 and is prevented from shifting in the width direction. The rubber 54 as the elastic member may be provided in a portion other than the step portion 36, and may be provided, for example, between the bottom portion 34 of the cap 31 and the bottom portion of the cap cover 41. Due to the thickness of 54, the distance from the optical axis (light projecting element 23) at the end to the end surface of the multi-optical axis photoelectric sensor 1 (the bottom of the cap cover 41) becomes long. In order to prevent this, in this embodiment, a rubber 54 is provided between the open end of the cap 31 and the bottom 34. In this embodiment, the rubber 54 is provided on both sides in the width direction of the optical unit 22 (optical axis). However, the rubber 54 may be arranged on the upper side or the lower side of the optical unit 22. In the case where the rubber 54 is arranged on the upper side of the optical unit 22, the rubber 54 is provided in a place where the optical axis is not blocked.

  An annular backup ring 52 is interposed between the cap 31 and the translucent case 13 in the radial direction orthogonal to the longitudinal direction. The backup ring 52 is disposed between the connecting portions 47 a and 47 b of the cover members 41 a and 41 b and the seal member 51 in the longitudinal direction of the multi-optical axis photoelectric sensor 1. The outer dimension of the backup ring 52 is formed to be larger than the distance between the connecting portions 47a and 47b. Therefore, the backup ring 52 is engaged with the connecting portions 47a and 47b in the longitudinal direction. The backup ring 52 is integrally formed with a locking portion 52a protruding outward in the radial direction, and the locking portion 52a engages with the fitting portion 33 in the longitudinal direction. That is, the backup ring 52 engages with the connecting portions 47 a and 47 b of the cap cover 41 on the case 11 side, and engages with the fitting portion 33 of the cap 31 on the end side of the sensor 1. The cap cover 41 is fixed to the end of the case 11. Therefore, the movement of the backup ring 52 in the longitudinal direction is restricted by the connecting portions 47a and 47b and the locking portion 52a. In other words, the backup ring 52 restricts the cap 31 from moving in the direction of the case 11 by engaging with the connecting portions 47a and 47b.

  The backup ring 52 whose movement is restricted in this way restricts the movement of the seal member 51 in the longitudinal direction. Specifically, the backup ring 52 is disposed closer to the case 11 than the seal member 51. When the translucent case 13 contracts due to a change in ambient temperature, the sealing member 51 tends to move toward the case 11 as the contraction occurs. At this time, since the backup ring 52 restricts the movement of the seal member 51, the seal member 51 is held in the cap 31, that is, between the cap 31 and the translucent case 13. Therefore, the watertightness between the translucent case 13 and the cap 31 is maintained.

  A connector mounting portion 37 is formed on the side of the optical unit housing portion 32. The connector mounting portion 37 is configured such that an upper portion thereof is exposed from the cap cover 41, and a connector member 53 that is electrically connected to the optical unit 22 is attached thereto.

  In the multi-optical axis photoelectric sensor 1 configured as described above, the locking projections 48 a and 48 b formed on the inner surface of the cap cover 41 are inside the locking recess 13 b formed on the outer surface of the translucent case 13. Has been inserted. Therefore, when the translucent case 13 contracts due to a change in ambient temperature, the side surface of the locking recess 13b engages with the locking projections 48a and 48b, and the contraction of the translucent case 13 is restricted. The cap 31 is restricted from moving in the direction of the case 11. Accordingly, relative movement between the cap 31 and the translucent case 13 along the longitudinal direction is restricted. As a result, the sealing member 51 does not come off from the outer peripheral surface of the translucent case 13, and the watertightness between the translucent case 13 and the cap 31 is maintained.

  As shown in FIG. 3, in the longitudinal direction (left-right direction in the figure), the lengths of the locking projections 48a and 48b are shorter than the width of the locking recess 13b. This allows the translucent case 13 to contract to such an extent that the seal member 51 does not come off between the outer peripheral surface of the translucent case 13 and the inner peripheral surface of the cap 31. Further, a dimensional difference in manufacturing is allowed, and mounting of the cap cover 41 (cover members 41a and 41b) is facilitated.

  In the multi-optical axis photoelectric sensor 1, the cap cover 41 fixed to the protective case 11 presses the cap 31 in the longitudinal direction (cap 31 side) via the rubber 54. As described above, the cap 31 is restricted from moving toward the case 11 along the longitudinal direction by the backup ring 52 and the connecting portions 47a and 47b. The cap 31 tends to move in the longitudinal direction due to the gap between the cap 31 and the cap cover 41, but is interposed in the gap between each stepped portion 36 of the cap 31 and each facing portion 45 of the cap cover 41. The rubber 54 presses the cap 31 toward the translucent case 13. Therefore, the movement of the cap 31 in the pull-out direction (longitudinal direction) is suppressed, and as a result, the positional deviation between the cap 31 and the opening end portion 13a of the translucent case 13 is suppressed. Thereby, the watertightness between the translucent case 13 and the cap 31 is reliably maintained. Further, the rubber 54 as an elastic member provided between the cap 31 and the cap cover 41 is different in processing dimension between the metal protective case 11 and the cap cover 41, the resin translucent case 13 and the cap 31. And the absorption of the dimensional difference at the time of thermal expansion and contraction caused by the difference in thermal expansion coefficient is not affected.

Next, characteristic effects of the present embodiment will be described.
(1) In the multi-optical axis photoelectric sensor 1, the locking projections 48 a and 48 b formed on the inner surface of the cap cover 41 are inserted into the locking recess 13 b formed on the outer surface of the translucent case 13. Yes. Therefore, when the translucent case 13 contracts due to a change in ambient temperature, the side surface of the locking recess 13b engages with the locking projections 48a and 48b, and the contraction of the translucent case 13 is restricted. As a result, the sealing member 51 does not come off from the outer peripheral surface of the translucent case 13, and the watertightness between the translucent case 13 and the cap 31 can be maintained.

  (2) The lid 12 of the multi-optical axis photoelectric sensor 1 accommodates the optical unit 22 protruding from the open end 13a of the translucent case 13 as a translucent member so that the optical axis can be formed, and the open end 13a. And a cap 31 as a cup-shaped resin sealing member for sealing the cap, and the cap 31 is fixed to the end of the protective case 11 so as to cover the cap 31 in a state where the translucent case 13 is sealed. And a cap cover 41 as a metal terminal member for preventing the cap 31 from coming off. A rubber 54 as an elastic member is interposed between the cap cover 41 and the cap 31 in the longitudinal direction, and the cap cover 41 fixed to the protective case 11 moves the cap 31 in the longitudinal direction via the rubber 54 ( By pressing toward the cap 31 side, the open end 13a of the translucent case 13 is sealed in a watertight manner. The cap 31 tends to move in the longitudinal direction due to a gap for allowing a processing dimensional difference between the cap 31 and the cap cover 41 and a dimensional difference at the time of thermal expansion / contraction. Therefore, the movement of the cap 31 in the pull-out direction (longitudinal direction) is suppressed, and as a result, the positional deviation between the cap 31 and the opening end portion 13a of the translucent case 13 can be suppressed. Thereby, the watertightness between the translucent case 13 and the cap 31 can be reliably maintained. Further, it does not affect the absorption of the dimensional difference at the time of thermal expansion / contraction caused by the difference in processing dimensional difference and thermal expansion coefficient between the metal protective case 11 and cap cover 41 and the resin translucent case 13 and cap 31. Can be.

  (3) The cap 31 has a cross-sectional shape at the other end between one end in the longitudinal direction (opening end) and the other end in the longitudinal direction (bottom 34) that seals the translucent case 13. The cap cover 41 has a shape corresponding to the step portion 36, and a rubber 54 is interposed between the cap 31 and the cap cover 41 in the step portion 36. . Therefore, the rubber 54 can be interposed between the cap cover 41 and the cap 31 in the longitudinal direction while maintaining the longitudinal dimension of the multi-optical axis photoelectric sensor 1.

  (4) Since the annular sealing member 51 for sealing the opening end 13a of the translucent case 13 is interposed between the open end 13a of the translucent case 13 and the cap 31, the translucent case The sealing performance of the 13 open end portions 13a can be reliably maintained.

  (5) Since the seal member 51 is interposed between the open end 13a of the translucent case 13 and the cap 31 in the radial direction orthogonal to the longitudinal direction, the resin translucent case 13 and the cap 31 are heated. Even if expansion occurs, the formation of a clearance between the translucent case 13 and the cap 31 can be suppressed, and the sealing property of the open end 13a of the translucent case 13 can be more reliably maintained.

In addition, you may change said embodiment as follows.
In the above-described embodiment, it is only necessary that the restricting means can restrict the contraction of the translucent case 13, and the configuration of the locking projections 48a and 48b and the locking recess 13b as the limiting means may be changed as appropriate. For example, the locking projection may be formed on the protective case 11. Further, the locking convex portion may be formed on the translucent case 13 and the locking concave portion may be formed on the cap cover 41 or the protective case 11.

In the above embodiment, the rubber 54 is used as the elastic member. However, the elastic member is not particularly limited thereto, and for example, an elastomer, a coil spring, a leaf spring, or the like may be used.
In the above-described embodiment, the rubber 54 is interposed between each stepped portion 36 of the cap 31 and each facing portion 45 of the cap cover 41. However, the present invention is not particularly limited to this. For example, the connector mounting portion 37 May be interposed in a facing portion facing the cap cover 41 in the longitudinal direction. Further, it may be provided between the bottom 34 of the cap 31 and the cap cover 41.

In the embodiment described above, three optical units 22 are provided, but the present invention is not particularly limited to this. For example, one or two optical units 22 may be provided, or four or more optical units 22 may be provided.
In the above embodiment, the cap 31 accommodates part of the optical units 22 at both ends, but may be configured to accommodate the entire optical units 22 at both ends.

In the above embodiment, only one protective case 11 and translucent case 13 are provided. However, the present invention is not particularly limited to this, and two or more protective cases 11 and translucent cases 13 may be provided.
In the above embodiment, the opening end portion of the fitting portion 33 is configured to contact the opening end portion of the protective case 11, but the hook shape extends from the fixing portion 43 of the cap cover 41 to the protective case 11 side of the fitting portion 33. You may comprise so that it may contact | abut with the extension part formed so that it might extend.

  In the above embodiment, although not particularly mentioned, the bottom 34 of the cap 31 (optical unit housing portion 32) is configured so that the entire end thereof is covered with the cap cover 41 (supporting portion 44). You may comprise so that a part of end surface of 34 may be exposed.

  In the above embodiment, the protective case 11 and the translucent case 13 are formed in a cylindrical shape with both ends open, and the lid 12 is provided at each of the both ends, but has a bottomed cylindrical shape with one end open. Thus, the protective case 11 and the translucent case 13 may be formed, and the lid 12 may be provided at the opening end.

  In the above embodiment, the seal member 51 is interposed between the side surface of the open end portion 13a of the translucent case 13 and the inner side surface of the cap 31 that face each other in the radial direction orthogonal to the longitudinal direction. May be interposed between the surfaces to be opened, that is, between the end surface of the open end 13a of the translucent case 13 and the cap 31 (stepped portion 36).

The perspective view of the multi-optical axis photoelectric sensor in this embodiment. The disassembled perspective view of a multi-optical axis photoelectric sensor. Sectional drawing which shows the edge part of a multi-optical axis photoelectric sensor.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Multi-optical axis photoelectric sensor, 11 ... Protective case as a housing | casing, 11a ... Window part of protective case, 12 ... Cover body, 13 ... Translucent case as translucent member, 13a ... Open end of translucent case , 13b... Locking recess as regulating means, 22 .. optical unit, 31... Cap as sealing member, 34 .. bottom part of cap (optical unit housing part), 35. ... cap cover as a terminal member, 41a, 41b ... cap member, 42 ... window part, 47a, 47b ... coupling part, 48a, 48b ... locking projection as restricting means, 51 ... sealing member, 54 ... as elastic member Rubber.

Claims (5)

A metal casing formed in a cylindrical shape having a window for forming an optical axis;
A resin-made translucent member that is formed in a cylindrical shape longer than the casing and is inserted into the casing such that both end portions protrude;
An optical unit that is inserted so that both end portions protrude from the translucent member, and forms a plurality of optical axes;
A lid attached to the end of the housing;
The lid is
A resin-made sealing member that is formed in a bottomed cylindrical shape with one end opened so as to accommodate the end of the optical unit so that an optical axis can be formed, and that seals the open end of the translucent member in a water-tight manner When,
A window portion for forming an optical axis, and in a state where the sealing member seals the translucent member, the longitudinal direction of the casing is fixed to the end portion of the casing so as to cover the sealing member. It consists of a metal terminal member that prevents the sealing member from coming out in the direction,
In a state where the terminal member is fixed to the housing, a regulation means for regulating relative movement between the translucent member and the sealing member is provided.
A multi-optical axis photoelectric sensor.   2. The multi-optical axis photoelectric sensor according to claim 1, further comprising an annular sealing member interposed between an opening end of the translucent member and the sealing member. The sealing member is formed so that the opening end of the translucent member can be fitted,
3. The multi-optical axis according to claim 2, wherein the seal member is interposed between an opening end portion of the translucent member and the sealing member in a radial direction orthogonal to the longitudinal direction. Photoelectric sensor. An elastic member interposed between the terminal member and the sealing member in the longitudinal direction;
The multi-light according to any one of claims 1 to 3, wherein the terminal member fixed to the casing presses the sealing member in the longitudinal direction via the elastic member. Axis photoelectric sensor. The sealing member has a step portion between the one end portion and the other end portion so that a cross-sectional shape of the other end portion is smaller than a cross-sectional shape of the one end portion, and the terminal member has the step portion Has a shape corresponding to the part,
The multi-optical axis photoelectric sensor according to claim 4, wherein the elastic member is interposed between the sealing member and the terminal member in the stepped portion.

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