JP2015005461A - Multiple optical axis photoelectric sensor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiple optical axis photoelectric sensor that facilitates an installation operation.SOLUTION: The multiple optical axis photoelectric sensor has: an elongated case body 4 opening at both ends; end members 6 comprising moldings attached to one end and the other end of the case body 4 to close the end openings; and an optical component 8 arranged from one end of the case body to the other end. The optical component 8 has the function of defining a spread angle of each optical axis. The optical component 8 and the end members 6 are fitted in tongue and groove for longitudinal displacement and against relative rotation. The end members 6 have through holes 70a formed therethrough.

Description

  The present invention relates to a multi-optical axis photoelectric sensor.

  The multi-optical axis photoelectric sensor is used as a safety device to monitor the intrusion into a dangerous area. A multi-optical axis photoelectric sensor incorporates a plurality of light projecting elements or light receiving elements, and a lens or the like as a member for defining an optical axis spread angle (detection light spread angle) constituted by these optical elements. The optical component to include is arrange | positioned for every optical axis (for example, patent documents 1-3).

  Patent document 1 is disclosing the multi-optical axis photoelectric sensor which employ | adopted the elongate main body case of the resin molded product. Specifically, a main body case that is a resin molded product has a detection window for each optical axis, and a lens member is bonded to the detection window. An optical element (light receiving element or light projecting element) is mounted on a substrate extending in the longitudinal direction and accommodated in the main body case. The sensor disclosed in Patent Document 1 can be called a multi-optical axis photoelectric sensor having a relatively simple configuration because the optical component is composed only of lenses. The main body case disclosed in Patent Document 1 is largely open on the back side, and a cover plate is attached to the back side of the main body case after the built-in product is accommodated in the main body case. This Patent Document 1 discloses that a reinforcing member is attached to suppress warping of the multi-optical axis photoelectric sensor. The reinforcing member is, for example, a molded product obtained by pressing a galvanized steel plate, and the reinforcing member has a length dimension extending from one end portion to the other end portion of the multi-optical axis photoelectric sensor. The reinforcing member is fixed to the main body case.

  Patent Document 2 discloses a multi-optical axis photoelectric sensor having an elongated case body that is a synthetic resin molded product. The multi-optical axis photoelectric sensor of Patent Document 2 has a substrate having a length extending over the entire area of a box-shaped case body opened forward, and an optical element (light projecting element or light receiving element) is provided on the substrate. And optical components including a lens are mounted. The optical element substrate is housed in the case body in a state surrounded by a metal reinforcing member such as an aluminum alloy. Here, both ends and both sides of the optical element substrate in the longitudinal direction are fixed to the reinforcing member, and portions of the optical element substrate are fastened to the reinforcing member by screws. A power cable is connected to the optical element substrate, and the power cable extends outward from the end of the case body. A cover made of light-transmitting synthetic resin is laser welded to the front opening of the box-shaped case body.

  Patent Document 3 discloses a relatively robust multi-optical axis photoelectric sensor. The case of the multi-optical axis photoelectric sensor of Patent Document 3 includes an elongated metal case body having a U-shaped cross section, an end cap that closes both ends of the case body, and a transparent plastic plate that covers the front opening of the case body. It consists of The built-in optical components housed in the case are unitized in units of one optical axis, and each unit is configured to include a package optical IC in addition to a member and a lens that regulate the spread angle of the optical axis. The one optical axis optical unit is assembled side by side on the support frame.

  A multi-optical axis photoelectric sensor is generally used in a set of a light-emitting sensor and a light-receiving sensor, and the light-projecting sensor and the light-receiving sensor are installed facing each other to form a light curtain. . Therefore, in the installation of the multi-optical axis photoelectric sensor, it is necessary to create a state in which the light-receiving sensor correctly receives the light emitted from the light-projecting multi-optical axis photoelectric sensor for each optical axis. This is so-called optical axis adjustment.

  Patent Document 4 proposes a fixture that can be suitably applied to a multi-optical axis photoelectric sensor including a case main body made of an extrusion-molded product having two groove portions positioned to face each other. This fixture has two claws that are positioned on the back side of the multi-optical axis photoelectric sensor and engage with the two grooves of the case body, respectively, and the longitudinal direction of the multi-optical axis photoelectric sensor and the multi-optical axis photoelectric sensor. The orientation can be adjusted.

JP-A-8-45400 JP 2011-216372 A JP 2006-107797 A JP 2003-242868 A

  Since the multi-optical axis photoelectric sensor is a safety device, a type in which the divergence angle is defined only by a lens like the multi-optical axis photoelectric sensor of Patent Document 1 has been proposed. The spread angle is subject to regulation. For this reason, a general multi-optical axis photoelectric sensor includes not only a lens but also an optical component for defining a spread angle of detection light. A multi-optical axis photoelectric sensor incorporating an optical component requires a structure for positioning the optical component, as can be seen in Patent Documents 2 and 3.

  In the multi-optical axis photoelectric sensor of Patent Document 2, an optical element substrate on which an optical component is mounted on a case body made of synthetic resin formed into a box shape is surrounded by a metal reinforcing member such as aluminum and positioned. The structure accommodated in the main body is adopted.

  The multi-optical axis photoelectric sensor of Patent Document 3 employs a case body that is a U-shaped metal extrusion molded product, and a support frame in a state in which optical units each including an optical element are arranged side by side. In this case, a structure is employed in which the case body is positioned and accommodated in the case body.

  Since the multi-optical axis photoelectric sensor becomes longer as the number of optical axes increases, the problem of warping of the case main body becomes remarkable. For this reason, as can be seen in Patent Documents 2 and 3, a reinforcing member or a support frame for substantially positioning the optical component is an important element. However, this is a factor that hinders downsizing and weight reduction of the multi-optical axis photoelectric sensor.

  By the way, Patent Document 1 discloses mounting holes disposed diagonally to each other at both ends of a case body made of synthetic resin. In many cases, when installing a multi-optical axis photoelectric sensor, A fixture for fixing the multi-optical axis photoelectric sensor to an installation surface constituted by columns is used. When the fixture disclosed in Patent Document 4 is adopted as this fixture, the height position adjustment of the multi-optical axis photoelectric sensor and the multi-optical axis photoelectric sensor are performed by a fixture interposed between the installation surface and the multi-optical axis photoelectric sensor. The angle of the multi-optical axis photoelectric sensor can be adjusted. In other words, the installation work of the multi-optical axis photoelectric sensor requires the work of adjusting the height position of the multi-optical axis photoelectric sensor and the angle adjustment of the multi-optical axis photoelectric sensor simultaneously or sequentially. However, this is not always easy.

  An object of the present invention is to provide a multi-optical axis photoelectric sensor that can reduce the installation work of the multi-optical axis photoelectric sensor.

According to the present invention, the above technical problem is
A multi-optical axis photoelectric sensor having a plurality of optical axes arranged at a predetermined optical axis pitch in the longitudinal direction,
An elongated case body with both ends open;
An end member made of a molded product attached to one end and the other end of the case body, and closing the opening of each end;
An optical component disposed from one end of the case body to the other end, the optical component for defining the spread angle of each optical axis,
The optical component and the end member can be displaced in the longitudinal direction, and the optical component and the end member are concavo-convexly fitted so as not to be relatively rotatable.
This is achieved by providing a multi-optical axis photoelectric sensor in which a through hole is formed in the end member and can be fixed to the installation surface with a fastener inserted through the through hole.

  That is, according to the present invention, the optical axis of the multi-optical axis photoelectric sensor is positioned with respect to the end member. By installing the multi-optical axis photoelectric sensor using the through hole of the end member, the optical axis and the relative position of the through hole are defined through the end member. Therefore, if the installation surface such as the wall or pillar for installing the multi-optical axis photoelectric sensor is a fixed surface, by using a through hole integrated with the multi-optical axis photoelectric sensor, A multi-optical axis photoelectric sensor can be installed without adjusting the optical axis, and a light curtain can be made by operating the multi-optical axis photoelectric sensor immediately after installing the multi-optical axis photoelectric sensor.

  In preferable embodiment of this invention, the said end member is comprised by the 1st member which closes opening of the edge of a case main body, and the 2nd member provided with the said through-hole. In this embodiment, an elastic member that is compressible in the longitudinal direction of the multi-optical axis photoelectric sensor is interposed between the first and second members. The expansion and contraction accompanying the temperature change of the case main body of the multi-optical axis photoelectric sensor is absorbed by the elastic member. This elastic member is effective when the case main body is an extruded product made of synthetic resin.

  Other objects and advantages of the present invention will become apparent from the detailed description of the following examples.

It is a perspective view of the flat type multi-optical axis photoelectric sensor of an Example. It is a perspective view of the slim type multi-optical axis photoelectric sensor of an example. It is a figure for demonstrating the typical example of the function contained in an Example. It is a figure for demonstrating the other typical example of the function contained in an Example. It is a perspective view of the case main body which is a component of the flat type | mold multi-optical axis photoelectric sensor of an Example. FIG. 6 is an end view of the case main body illustrated in FIG. 5. It is a perspective view of the case main body which is a component of the slim type multi-optical axis photoelectric sensor of an Example. FIG. 8 is an end view of the case main body illustrated in FIG. 7. It is a disassembled perspective view of the built-in goods of the flat type multi-optical axis photoelectric sensor of an Example. It is a disassembled perspective view of the built-in goods of the slim type multi-optical axis photoelectric sensor of an Example. It is a perspective view of the main optical unit which is a component of a flat type multi-optical axis photoelectric sensor. It is a perspective view of the extension optical unit which is a component of a flat type multi-optical axis photoelectric sensor. It is a perspective view of the main optical unit which is a component of a slim type multi-optical axis photoelectric sensor. It is a perspective view of the extension optical unit which is a component of a slim type multi-optical axis photoelectric sensor. It is a perspective view of the rigid member (frame) which is a component of a flat type multi-optical axis photoelectric sensor. It is a perspective view of the rigid member (frame) which is a component of a slim type multi-optical axis photoelectric sensor. It is the figure which omitted the illustration of the case main body and the main control board from the flat type sensor, and illustrated the optical unit, the frame, and the end member. FIG. 18 is a front view of the optical unit, the frame, and the end member illustrated in FIG. 17 as viewed from the optical axis direction. It is a figure for demonstrating the arrangement | positioning relationship between the optical element (light receiving element or light projection element) mounted in the optical element board | substrate of the multi-optical axis photoelectric sensor of an Example, and a lens. It is a perspective view which shows the state which assembled | attached the optical unit to the flame | frame and was fixed with the countersunk screw. It is the front view which looked at the state where the optical unit was fixed to the frame from the optical axis direction. It is a perspective view of the 1st elastic member (synthetic resin molded product) for flat type sensors fixed to a frame. It is a perspective view of the 1st elastic member (synthetic resin molded product) for slim type sensors fixed to a frame. It is sectional drawing of a multi-optical axis photoelectric sensor, Comprising: It is the figure which cut | disconnected the main-body part of the 1st elastic member. It is sectional drawing of a multi-optical axis photoelectric sensor, Comprising: It is the figure which cut | disconnected the spring-like lip part of the 1st elastic member. It is a perspective view of the end member which turned up the inner surface. It is a perspective view of the end member which turned the outer surface up. It is the figure which expanded the part of the recessed part formed in the inner surface of an end member. It is sectional drawing of the one end part of a multi-optical axis photoelectric sensor. It is a figure for demonstrating the installation example of a flat type multi-optical axis photoelectric sensor. It is a figure for demonstrating the installation example of a slim type | mold multi-optical axis photoelectric sensor. It is a figure which shows an example of the auxiliary tool for supporting the longitudinal direction intermediate part of a multi-optical axis photoelectric sensor, when installing a multi-optical axis photoelectric sensor. It is a figure which shows the other example of the auxiliary tool for supporting the longitudinal direction intermediate part of a multi-optical axis photoelectric sensor, when installing a multi-optical axis photoelectric sensor. It is a disassembled perspective view for demonstrating the attachment member with an elastic member which can be mounted | worn with one-touch with respect to the end member laser-welded to the edge of the case main body of a multi-optical axis photoelectric sensor. It is sectional drawing of the one end part of the multi-optical axis photoelectric sensor which attached the attachment member. It is the figure which looked at the one end part of the flat type multi-optical axis photoelectric sensor which attached the attachment member from the top. It is a figure for demonstrating the connector part provided in the edge part of a multi-optical axis photoelectric sensor, and the external connector which can be connected to this. It is a figure for demonstrating the state of the multi-optical axis photoelectric sensor which connected the external connector. It is a perspective view of the cover member for preventing that an external connector falls off. It is a figure for demonstrating the state which assembled | attached the cover member to the multi-optical axis photoelectric sensor. It is a perspective view of the protective cover which can be assembled | attached after installing a flat type multi-optical axis photoelectric sensor. It is a perspective view of the protective cover which can be assembled | attached after installing a slim type | mold multi-optical axis photoelectric sensor.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  1 and 2, the multi-optical axis photoelectric sensor 200 of the embodiment has a case 2 which is a basic component, and two types of sensors 200F (FIG. 1) are used by using the case 2 having a common basic configuration. ), 200S (FIG. 2).

  As can be seen from FIGS. 1 and 2, the case 2 has an elongated shape with a substantially rectangular cross section. In the first sensor 200F of FIG. 1, a relatively wide surface corresponding to the long side of the rectangle is used as the light projecting / receiving surface 2a. In the second sensor 200S of FIG. 2, a relatively narrow surface corresponding to a rectangular short side is used as the light projecting / receiving surface 2a. 1 and 2 are both shown with the light emitting / receiving surface 2a of the sensors 200F and 200S facing down and the back surface 2b facing up.

  1 and 2 are compared, when the light projecting / receiving surface 2a of the first sensor 200F (FIG. 1) and the second sensor 200S is viewed from the front, the first sensor 200F of FIG. 1 is wide and thin. It has an outer shape. Therefore, the first sensor 200F illustrated in FIG. 1 is referred to as a “flat sensor”. On the other hand, the second sensor 200S of FIG. 2 has an outer shape that is narrow and thick when viewed from the front. Therefore, the second sensor 200S shown in FIG. 2 is referred to as a “slim type sensor”.

  3 and 4 are diagrams for explaining typical examples of functions included in the multi-optical axis photoelectric sensor 200 of the embodiment. Referring to FIGS. 3 and 4, the case 2 of the multi-optical axis photoelectric sensor 200 is generally configured by a case main body 4 that is an extrusion-molded product, and end members 6 that close both end openings. . The optical component 8 for defining the spread angle of each optical axis of the multi-optical axis photoelectric sensor 200 is unitized. A plurality of types of multi-optical axis photoelectric sensors 200 having different optical axis numbers from a relatively small number of optical axes to a relatively large number of optical axes are manufactured using a single or a plurality of optical units. . The plurality of optical axes included in the multi-optical axis photoelectric sensor 200 are arranged at predetermined intervals in the longitudinal direction of the multi-optical axis photoelectric sensor 200 from one end to the other end of the multi-optical axis photoelectric sensor 200. The plurality of optical axes are typically arranged in a line. In addition, the light projecting element or the light receiving element, that is, the optical element of each optical axis of the multi-optical axis photoelectric sensor 200 may constitute a part of the optical component 8, or separately from the optical component 8, for example, an optical element May be disposed adjacent to the optical component 8 (not shown).

  The multi-optical axis photoelectric sensor 200 of the embodiment positions the optical component 8, and the reference is the end member 6. That is, each optical axis of the multi-optical axis photoelectric sensor 200 is positioned with respect to the end member 6. In order to realize this, as can be easily understood from FIG. 3, the end member 6 and the optical component 8 are concavo-convexly fitted so as not to be relatively rotatable. In this uneven fitting, the end member 6 and the optical component 8 can be inserted and removed in the longitudinal direction of the case 2, that is, can be displaced in the longitudinal direction of the case 2. Reference numeral 10 in FIG. 3 indicates a convex portion, and 12 indicates a concave portion. In the illustrated example, the optical component 8 has a convex portion 10 on its end surface, and the end member 6 has a concave portion 12.

  Of course, the optical component 8 may have the concave portion 12 and the end member 6 may have the convex portion 10. Further, the optical component 8 has a convex portion 10 and a concave portion 12, and the concave portion 12 and the convex portion 10 that are fitted to the convex portion 10 and the concave portion 12 are provided in the end member 6, thereby restricting the rotation of the optical component 8. May be performed. A plurality of concave and convex fittings may be employed to prevent relative rotation between the end member 6 and the optical component 8. If a single concavo-convex fitting is employed, the cross-sectional shapes of the convex portion 10 and the concave portion 12 having complementary cross-sectional shapes should be non-circular.

  Regarding the above-described uneven fitting, it is not limited to the meaning of fitting with no play. For example, if a plurality of uneven fittings are used, one uneven fitting method may be a loose fitting method with some play, and the other uneven fitting method may be a fitting method without play. A typical example of this fitting method without play is a so-called positioning pin. A positioning pin method may be adopted to restrict the rotation of the optical component 8 relative to the end member 6.

  The positioning of the optical component 8 in the longitudinal direction is not necessarily essential, but a mechanical configuration that regulates the displacement in the longitudinal direction of the optical component 8 such as a part of the end of the optical component 8 butting the end member 6 is optical. It may be realized by the design of the part 8 and the end member 6.

  The end member 6 serving as a reference for positioning the optical axis is a molded product. The material of the end member 6 may be a synthetic resin or a metal such as an aluminum alloy.

  A virtual line 14 illustrated in FIG. 3 indicates a rigid member. The rigid member 14 is typically composed of a metal bar or a frame formed into a three-dimensional shape. It is convenient for weight reduction and size reduction that the frame is a metal plate that is press-molded and formed into a three-dimensional shape such as a substantially L-shaped cross section or a substantially U-shaped cross section. The rigid member 14 extends from one end of the multi-optical axis photoelectric sensor 200 to the other end. If this rigid member 14 is employed, the optical component 8 is fixed to the rigid member 14 while being positioned on the rigid member 14.

  As can be seen from the above description, in the example of FIG. 3, the optical component 8 is directly positioned with respect to the end member 6 and its rotation is restricted. Preferably, the above-described rigid member 14 is employed as a support member for the optical component 8. As a modification, the end of the rigid member 14 may be fixed to the end member 6 as shown in FIG. 4, and the optical component 8 may be positioned on the rigid member 14. According to this, the optical component 8 can be positioned on the end member 6 via the rigid member 14 and its rotation can be restricted. Further, both the rigid member 14 and the optical component 8 may be positioned so as not to rotate with respect to the end member 6.

  The case body 4 is an extruded product as described above, but the material may be a metal (typically an aluminum alloy), or a synthetic resin (polycarbonate) or FRP. The case body 4 of the embodiment employs an amorphous resin such as acrylic resin, polyarylate resin, polycarbonate, PST (polystyrene), and PSE (polyethersulfan). In particular, since the polyarylate resin is a chemical-resistant resin having a high light transmittance (about 90%), the polyarylate resin is preferably used as the material of the case body 4. Moreover, the cross-sectional shape of the case main body 4 may be an open cross-sectional shape such as a U-shape, or may have a closed cross-sectional shape, that is, a hollow cross-sectional shape as will be described later.

  The extrusion molding method is a molding method in which it is difficult to ensure the accuracy of the molded product at a high level. For this reason, it is desirable to design the optical component 8 incorporated in the case body 4 so as not to be in direct contact with the case body 4. In other words, in the design of the multi-optical axis photoelectric sensor 200, it is preferable that the inner surface of the case body 4 and the optical component 8 accommodated in the case body 4 are separated from each other. The meaning of the term “separation” does not mean that an adhesive such as a cushion material or a double-sided adhesive tape is partially interposed between the optical component 8 and the case body 4. As a support structure for an intermediate portion of the long optical component 8, a cushion material or a resilient material may be disposed between the optical component 8 or the frame (rigid member 14) and the case body 4.

  For example, when the case main body 4 having an open cross sectional shape such as a U-shaped cross section is employed, a light transmitting plate constituting the light projecting / receiving window is typically an adhesive with respect to the case main body 4. It is liquid-tightly joined using This adhesion site is called “waterproof line (IP (Ingress Protection) line)” in this industry. On the other hand, when an extruded molded product having a closed cross-sectional shape is adopted as the case body 4, the multi-optical axis photoelectric sensor 200 may be referred to as a sensor without an IP line for a front cover (detection light passage window member). it can. Employing a case structure without an IP line for the front cover (detection light passage window member) eliminates the need for adopting a structure for waterproofing, and thus enables downsizing of the sensor.

Case body (FIGS. 5 to 8) :
Returning to FIGS. 1 and 2, the multi-optical axis photoelectric sensor 200 of the embodiment employs an extruded product having a closed cross-sectional shape as the case body 4. 5 and 6 show the case body 4 used in the flat sensor 200F shown in FIG. 7 and 8 show the case body 4 used in the slim type sensor 200S shown in FIG. The case main body 4 employed in each type of sensor 200F, 200S has basically the same end face shape and cross-sectional size as can be seen by comparing FIGS. 6 and 8 which are end face views.

  In the multi-optical axis photoelectric sensor 200 of the embodiment, as in the conventional case, sensors having different numbers of optical axes can be made by preparing a plurality of types of case bodies 4 having different length dimensions. 5 and 7 are compared, the length of the case body 4 shown in FIG. 5 is longer than that of the case body 4 of FIG. 7, but this is not essential. FIG. 5 merely illustrates the case body 4 of the flat multi-optical axis photoelectric sensor 200F having a relatively large number of optical axes. If the pitch between the optical axes and the number of optical axes are the same, the length dimensions of the case body 4 of the flat type sensor 200F and the slim type sensor 200S are substantially the same.

  First, the case body 4 of the flat sensor 200F will be described with reference to FIGS. 5 and 6. The closed cross-sectional shape of the case body 4 is substantially rectangular. More specifically, when viewed from the end face, two short sides 4S that are positioned to face each other and extend straight in parallel to each other, and two short sides 4S that are located to face each other and basically straight to be parallel to each other It has a long side 4L that extends. Each long side 4L has a groove 4c at one end of the cross-sectional shape. Due to the presence of the paired grooves 4c, the case body 4 has an irregular cross-sectional shape as compared with the geometric shape of a quadrangular cross-section with a slightly rounded corner. The left and right groove portions 4c, 4c may be located in a symmetrical position, but may be located in an asymmetrical manner.

  The case body 4 includes a visible light transmitting portion 4T made of a transparent synthetic resin material (polyarylate resin) and a light shielding portion 4B made of a colored synthetic resin material (a pigment is added to the polyarylate resin). Has been. That is, the case main body 4 is a molded product formed by simultaneous molding of two colors. Of course, the case main body 4 may be formed by extrusion molding with one kind of light-transmitting resin material, and after the molding, a coating material may be applied to make the light shielding portion 4B.

  As can be seen best from FIG. 6, the visible light transmitting portion 4T is formed in a corner portion far from the groove portion 4c in one long side 4L when viewed in a cross-sectional shape, and from the middle portion of the long side 4L to the short side 4S. It extends to the end. The intermediate portion of the visible light transmitting portion 4T is a detection light passing portion 4M for light projection and reception. The intermediate portion, that is, the detection light passing portion 4M is formed of a smooth surface in which two opposing surfaces that define the parallel portion extend in parallel (uniform thickness) and straight.

  6 and 8 indicates a rib extending in the longitudinal direction. Referring to FIG. 6, the flat case body 4 (200F) has two ribs R positioned on both sides of the detection light passage portion 4M on the long side 4L. Referring to FIG. 8, slim-type case body 4 (200S) has two ribs R located on both sides of detection light passage portion 4M on short side 4S. By forming the ribs R on both sides of the detection light passage portion 4M in this way, when any object collides with the multi-optical axis photoelectric sensor 200, the object directly contacts the detection light passage portion 4M. It is possible to prevent the detection light passage portion 4M from being damaged by collision.

  As described above, the detection light passing portion 4M, that is, the portion through which the detection light of the multi-optical axis photoelectric sensor 200F passes is present in the intermediate portion of the transparent visible light transmitting portion 4T. In other words, since the detection light passage portion 4M is designed to be located at a portion away from the two boundaries between the transparent visible light transmission portion 4T and the colored light shielding portion 4B, the case body 4 is extruded. At this time, there is no possibility that the colored synthetic resin material is mixed into the detection light passage portion 4M.

  “4.9” shown in FIG. 6 means the width dimension of the detection light passage portion 4M, and the width of the detection light passage portion 4M is 4.9 mm. “2.2” indicates that the dimension between the detection light passage portion 4M and the corner portion of the case body 4 is 2.2 mm. “1.0” means the thickness dimension of the detection light passage portion 4M, and the detection light passage portion 4M has a thickness dimension of 1.0 mm. A thickness dimension of, for example, 1.3 mm or less, in particular, a thickness dimension of 1.0 mm of the detection light passage portion 4M of the embodiment, as can be understood by those skilled in the art, can ensure the forming accuracy of the detection light passage portion 4M in extrusion molding. It is thin enough to be said to be the limit. Although the thin case body 4 has a substantially rectangular cross section, the shape of the rectangular cross section is modified by arranging a pair of the groove portions 4c described above at positions facing each other. The rigidity of the case body 4 can be increased by this modification.

  7 and 8, the closed cross-sectional case body 4 of the slim type sensor 200S is made of a transparent synthetic resin material, similar to the flat type sensor 200F (FIGS. 5 and 6) described above. The visible light transmitting portion 4T and the light shielding portion 4B made of a colored synthetic resin material are included. However, as can be seen from FIGS. 7 and 8, the case main body 4 of the slim type sensor 200 </ b> S is a visible light transmitting portion 4 </ b> T whose transparent side 4 </ b> S apart from the groove portion 4 c is transparent. It extends from the corner of the case body 4 to the end of each long side 4L.

  What should be noted here is that the width of the detection light passage portion 4M is 7.6 mm, which is wider than the flat sensor F described above. Further, the detection light passage portion 4M is disposed at an intermediate portion of the short side 4S. As a result, when the slim sensor 200S is manufactured, any long side 4L of the two long sides 4L can be used as a reference for assembling a built-in product described later. That is, referring to FIG. 8, a built-in product may be assembled based on the long side 4L located above, or a built-in product may be assembled based on the long side 4L located below. Never do.

  The flat type sensor 200F and the slim type sensor 200S are both the shape of the portion of the case body 4 excluding the detection light passage portion 4M, that is, the shape of the long side 4L and the short side 4S other than the detection light passage portion 4M. Is arbitrary, and for example, the long side 4L and the short side 4S may have a curved shape, or may have a wavy shape. Of course, the area occupied by the multi-optical axis photoelectric sensor 200 can be reduced by forming the shape of the case body 4 as shown in FIGS. 5 to 8, that is, the outer surfaces of the long side 4L and the short side 4S as flat surfaces. be able to. That is, the multi-optical axis photoelectric sensor 200 can be made compact.

Internal structure of multi-optical axis photoelectric sensor 200 (FIGS. 9 and 10) :
FIG. 9 shows the internal structure of the flat sensor 200F. FIG. 10 shows the internal structure of the slim type sensor 200S. Since the internal structure of the flat type sensor 200F and the slim type sensor 200S is basically the same, common members are denoted by the same reference numerals and members of the flat type sensor 200F are denoted by “F”. “S” is added to the members of the slim type sensor 200S.

  The multi-optical axis photoelectric sensor 200 of the embodiment includes an optical component 8 for generating an optical axis having a predetermined divergence angle, an optical element substrate 20 fixed to the optical component 8, a main control substrate 22, and a metal plate. And a press-molded frame 14.

Optical unit 16 (FIGS. 11-14):
The optical component 8 described with reference to FIGS. 3 and 4 includes an optical unit 16. The optical unit 16 is prepared with 8 optical axis units and 4 optical axis units. Of course, the number of optical axes of the optical unit 16 is arbitrary. In the multi-optical axis photoelectric sensor 200 according to the embodiment, the multi-optical axis photoelectric sensor 200 having a large number of optical axes can be made by combining the 8-optical axis optical unit and the 4-optical axis optical unit. Reference numeral 24 indicates a lens. The optical axes Oa of the optical unit 16 are arranged in a line in the longitudinal direction and at equal intervals. 11 and 12 show the optical unit 16F incorporated in the flat sensor 200F. An optical unit 16F (m) shown in FIG. 11 is a main optical unit, and an optical unit 16F (ad) shown in FIG. 12 is an additional 8-optical axis unit. In addition, a 4-optical axis unit is also prepared as an additional optical unit 16F (ad). 13 and 14 show an optical unit 16S incorporated in the slim type sensor 200S. An optical unit 16S (m) shown in FIG. 13 is a main optical unit, and an optical unit 16S (ad) shown in FIG. 14 is a four-axis optical unit for expansion. In addition, an 8-optical axis unit is also prepared as an additional optical unit 16S (ad). The optical unit 16 in FIGS. 11 to 14 is a unit before the lens 24 is attached.

Optical element substrate 20 (FIGS. 9 and 10) :
The optical element substrate 20 includes a main element substrate 20 (m), an extension element substrate 20 (ad) for eight optical axes, and an extension element substrate 20 (ad) for four optical axes, and has a multi-optical axis. In accordance with the number of optical axes of the photoelectric sensor 200, an extension element substrate 20 (ad) having 8 optical axes and / or 4 optical axes is assembled. An optical element 26 composed of a light receiving element or a light projecting element is mounted on the optical element substrate 20. As the optical element substrate 20, a main optical element substrate 20 (m) and an additional element substrate 20 (ad) are prepared. The optical elements 26 are arranged in a line and at equal intervals in the longitudinal direction of the multi-optical axis photoelectric sensor 200. The optical element substrate 20 is fixed to the optical component 8 described above with screws 28. The plurality of optical element substrates 20 are electrically connected to each other adjacent element substrates 20 and 20 by a card wire 30.

Frame 14 (FIGS. 15 and 16) :
Referring to FIGS. 15 and 16 in addition to FIGS. 9 and 10, the frame 14 has a three-dimensional three-dimensional shape obtained by press-molding a metal plate as described above. FIG. 15 shows a frame 14F of the flat sensor 200F, and the frame 14F has a substantially L-shaped cross section. FIG. 16 shows a frame 14S of the slim type sensor 200S, and the frame 14S has a substantially L-shaped cross section. The frame 14 preferably has a length that continuously extends from one end to the other end of the multi-optical axis photoelectric sensor 200, and a dedicated frame 14 is prepared for each multi-optical axis photoelectric sensor 200 having a different length. .

  The optical unit 16 described above is fixed to a predetermined position on the frame 14 using a countersunk screw 32. By using the countersunk screw 32, the optical unit 16 can be screwed to the frame 14 in a state where the screw head does not protrude outwardly from the outer plate surface of the frame 14. As a result, the separation distance between the frame 14 and the case body 4 can be suppressed to an extremely small size. This can reduce the cross-sectional area of the case body 4 and contribute to downsizing the multi-optical axis photoelectric sensor 200.

  In the case of the multi-optical axis photoelectric sensor 200 in which a plurality of optical components 8 are arranged in a line, the two adjacent optical units 16 and 16 are fixed to the frame 14 in a state of being separated from each other. Of course, you may employ | adopt the structure which connects two adjacent optical units 16 and 16 mutually. Even if it is a structure in which a plurality of optical units 16 are connected to each other or a structure in which the optical units 16 are arranged in a state of being separated from each other as in the embodiment, the pitch between the optical axes of the multi-optical axis photoelectric sensor 200 is constant. is there.

  The main control board 22 has a function of controlling the multi-optical axis photoelectric sensor 200 in an integrated manner, and the main control board 22 is screwed to one end portion of the frame 14 in a state adjacent to the main optical element board 20 (m). Is done.

  9 and 10, an extension connector board 34 is disposed at the other end portion of the frame 14, and the extension connector board 34 may be screwed to the frame 14. In this embodiment, the extension connector board 34 is soldered. Is done. The extension connector board 34 is accessed by a connector 82 (FIG. 37) of an external cable 84, and is connected to another multi-optical axis photoelectric sensor 200 or a control device using the external cable 84. A typical connection example using the cable 84 is as follows.

(1) The multi-optical axis photoelectric sensor 200 on the light-projecting side and the multi-optical axis photoelectric sensor 200 on the light-receiving side that is paired with the light-receiving side multi-optical axis photoelectric sensor 200 are connected by a cable 84. Outputs a shading signal to an external device.
(2) A plurality of light-emitting side sensors 200 are connected in series with a cable 84, and a plurality of light-receiving side sensors 200 are connected in series with a cable 84, from the leading multi-optical axis photoelectric sensor 200 on the light-receiving side. A light shielding signal is output to an external device through the cable 84.

  Note that a display light emitting element 36 is mounted between the optical elements 26 on the optical element substrate 20, and the display light emitting element 36 is disposed on the optical element 26 arranged in a line. The display light emitting element 36 may be disposed in an offset state from the column of the elements 26.

  17 to 19 show a state where the optical unit 16F, the optical element substrate 20F, and the frame 14F are assembled in a flat sensor 200F as a representative example. FIG. 17 is a perspective view seen obliquely from above. FIG. 18 is a front view of the optical unit 16F. FIG. 19 is a diagram showing a relative positional relationship between each optical element 26 and the lens 24 of the optical element substrate 20F. 17 to 19, reference numeral 38 indicates an indicator lamp, and 40 indicates an operation indicator lamp. Note that reference numeral 42 in FIG. 19 indicates a light emitting element for an operation indicator lamp.

  As can be seen from FIGS. 18 and 21, the indicator lamp 38 and the operation indicator lamp 40 are arranged between the lenses 24 (optical axis Oa) arranged in a line at a predetermined optical axis pitch. The light of the indicator lamp 38 and the operation indicator lamp 40 can be visually recognized through the visible light transmitting portion 4T (FIGS. 6 and 8) of the case body 4. In the cross-sectional shape of the case body 4, a detection light passage portion 4 </ b> M is disposed at an intermediate portion of the visible light transmission portion 4 </ b> T. In other words, the visible light transmitting portion 4T has a larger width than the detection light passing portion 4M. As can be seen from FIGS. 6 and 8, the visible light transmitting portion 4T extends to a corner of the case body 4 having a substantially rectangular cross section, and further extends to a surface adjacent to the surface where the detection light passing portion 4M exists. Yes. From this, the light emitted from the indicator lamp 38 and the operation indicator lamp 40 can be visually recognized not only from the surface where the detection light passage portion 4M exists but also from the surface adjacent thereto. Therefore, the lighting of the indicator lamp 38 and the operation indicator lamp 40 can be confirmed from a wide range. In other words, the indicator lamp 38 and the operation indicator lamp 40 are arranged between the optical axis pitches, and the multi-optical axis photoelectric sensor 200 is reduced in size while the indicator lamp 38 and the operation indicator lamp 40 are turned on. Visibility can be improved. Of course, the corners of the case body 4 may be rounded in a cross-sectional arch shape. Further, the case body 4 may be a substantially quadrangle such as a substantially square cross section.

  As can be seen from FIGS. 18 and 21, the indicator lamps 38 are arranged at substantially the same pitch from one end to the other end in the longitudinal direction of the multi-optical axis photoelectric sensor 200. That is, the indicator lamps 38 are uniformly arranged in the longitudinal direction of the multi-optical axis photoelectric sensor 200. Therefore, the indicator lamp 38 can be turned on to indicate whether or not the optical axis adjustment is appropriate, or can be turned on to indicate a work command to the worker by a control signal from an external device.

Support structure of the frame 14 :
Referring to FIGS. 9 and 10, a first elastic member 46 is disposed between two adjacent optical units 16 and 16 and element substrates 20 and 20, and the first elastic member 46 is a frame. 14 is fixed to the screw. The screw is a countersunk screw 32 for fixing the optical element substrate 20 to the frame 14, and the optical element substrate 20 and the first elastic member 46 are fastened to the frame 14 together with the countersunk screw 32 (see FIG. 20, FIG. 21, FIG. 25). A single view of the first elastic member 46 is shown in FIGS. FIG. 22 shows a first resilient member 46F assembled to the flat sensor 200F. FIG. 23 shows the first elastic member 46S assembled to the slim type sensor 200S. Referring to FIGS. 24 and 25, the first resilient member 46 has a first spring-like lip 46 a having a spring property and a second spring-like lip 46 b located across the standing wall of the frame 14. It is a molded product of synthetic resin. The first spring member 46, which is a resin spring, has a first spring lip 46a extending in the direction of the long side 4L of the case body 4 and in contact with the long side 4L. On the other hand, the second lip 46b extends in the direction of the short side 4S of the case body 4 and comes into contact with the short side 4S. FIG. 24 is a view of the first elastic member 46 as viewed from the longitudinal direction of the multi-optical axis photoelectric sensor 200 inside the multi-optical axis photoelectric sensor 200, and FIG. 25 is a portion of the first elastic member 46. FIG. 24 and 25, the long side 4L of the case body 4 and the frame 14 are shown in contact with each other for reasons of drawing. However, in actuality, the case body 4 and the frame 14 are slightly in contact with each other. It is separated.

End member 6 (FIGS. 19 and 26 to 29) :
The end member 6 is a flat molded product and is made of a synthetic resin material. FIG. 26 is a view of the end member 6 with the inner surface facing upward, as viewed obliquely from above. FIG. 27 is a view of the end member 6 with the outer surface facing upward, as viewed obliquely from above. Referring to FIG. 26 showing the inner surface 6a of the end member 6, the flat end member 6 has one recess 50 on the inner surface 6a. FIG. 28 is an enlarged view of the recess 50. The end member 6 is applied to both the flat sensor 200F and the slim sensor 200S. The recess 50 has a square cross-sectional shape when viewed from the front, and a plurality of ridges 52 are formed on the four wall surfaces 50 a of the recess 50. The ridges 52 extend in the longitudinal direction of the multi-optical axis photoelectric sensor 200, and the substantial effective sectional area of the recesses 50 is defined by the ridges 52.

  The recess 50 (FIGS. 26 and 28) formed in the inner surface 6a of the end member 6 is used to position the optical unit 16 constituting the end of the optical component 8 (FIGS. 3 and 4). As can be understood with reference to FIGS. 11 to 14, the optical unit 16 has positioning projections 54 formed at both ends thereof. The positioning projection 54 is received in a recess 50 formed on the inner surface 6 a of the end member 6. The positioning protrusion 54 has a square cross-sectional shape, and the cross-sectional area thereof is the same as the substantially effective cross-sectional area of the recess 50 of the end member 6. Therefore, the projection 54 of the optical unit 16 can be fitted into the recess 50 of the end member 6 and can be displaced in the longitudinal direction of the multi-optical axis photoelectric sensor 200 (FIG. 29). The recess 50 and the protrusion 54 have a square shape that is complementary to each other. That is, since the recess 50 and the protrusion 54 have non-circular cross-sectional shapes complementary to each other, the rotation of the optical unit 16 is restricted by the end member 6.

  The flat end member 6 is formed in a rectangular shape having substantially the same dimensions as the end surface of the case body 4. The end member 6 is welded by, for example, a laser while being aligned with the end surface of the case body 4. By aligning the end member 6 with the end surface of the case body 4, the end member 6 can be substantially positioned with respect to the case body 4. For example, the end member 6 may be provided with a means for positioning the end member 6 with respect to the case body 4. Specifically, for example, a positioning protrusion that engages with the inner surface of the end portion of the case body 4 may be provided on the inner surface 6 a of the end member 6.

  Referring to FIG. 27 showing the outer surface 6 b of the end member 6, a second recess 56 is formed in the outer surface 6 b of the end member 6. The second recess 56 has a non-circular shape, for example, an elliptical shape when viewed from the front. A plurality of ridges 58 are also formed in the second recess 56, and each ridge 58 extends in the longitudinal direction of the multi-optical axis photoelectric sensor 200. The second recess 56 is used for attaching an attachment member 70 described later.

Example of installation of multi-optical axis photoelectric sensor 200 (FIGS. 30 and 31) :
An installation example of the multi-optical axis photoelectric sensor 200 of the embodiment will be described with reference to FIGS. 30 and 31 are views of the device 62 as a danger source as viewed from above. The device 62 is surrounded by a wall 64 on three sides, and the multi-optical axis photoelectric sensor 200 is installed in the opening 66 of the danger area.

  FIG. 30 shows an example in which the flat sensor 200 </ b> F is installed on the inner surface of the wall 64. Even if the multi-optical axis photoelectric sensor 200 is installed on the wall 64 or the inner surface of the pillar, if this is a thin flat sensor 200F, the opening of the opening 66 due to the installation of the multi-optical axis photoelectric sensor 200 is reduced as much as possible. Can be small.

  FIG. 31 shows an example in which the slim type sensor 200S is installed on the wall 64 or the front surface of the pillar. Even if the multi-optical axis photoelectric sensor 200 is installed on the wall 64 or the pillar, if this is the slim sensor 200S, the amount of protrusion of the multi-optical axis photoelectric sensor 200 that protrudes forward from the wall 64 or the pillar is reduced. I can. With such installation, the multi-optical axis photoelectric sensor 200 does not narrow the gap between the opening portions 66 of the dangerous area.

Installation aid (FIGS. 32 and 33) :
When the multi-optical axis photoelectric sensor 200 is a long sensor, even if both ends thereof are fixed, the intermediate portion in the longitudinal direction may be bent. An auxiliary tool for suppressing this is shown in FIGS. 32 and 33 as an example. FIG. 32 shows the first installation assistance tool 94, and FIG. 33 shows the second installation assistance tool 96. These first and second installation aids 94 and 96 are formed by press-molding a metal plate, and basically have the same configuration, so the same elements are given the same reference numerals. The installation aids 94 and 96 have a flat base portion 94a, and claw portions 94c are respectively formed at the base end portion and the upper end portion of the standing portion 94b rising from the base portion 94a.

  The base portion 94a is formed with two bolt insertion holes 94d that are separated from each other. The first installation aid 94 also has a third bolt insertion hole 94e, and these three bolt insertion holes 94d, 94d, 94e are so-called fool holes, and these bolt insertion holes 94d, 94d, 94e. Is bolted to the wall 64 or column. The second installation auxiliary tool 96 is formed with a slit 94f in addition to the two bolt insertion holes 94d and 94d. The second installation auxiliary tool 96 uses the two bolt insertion holes 94d and 94d and the slit 94f. It is fixed to the wall 64 or the pillar.

  The first and second installation aids 94 and 96 are fixed to the wall 64 or the column in advance. The multi-optical axis photoelectric sensor 200 is engaged with the pair of grooves 4c of the case body 4 with the claw portions 94c of the auxiliary tools 94 and 96 with respect to the first and second installation auxiliary tools 94 and 96. Is fixed in a non-rotatable position.

  The first and second installation aids 94 and 96 are selectively used depending on the installation surface for installing the multi-optical axis photoelectric sensor 200. As necessary, one or a plurality of installation aids 94 and 96 are arranged on the wall 64 or the column for one multi-optical axis photoelectric sensor 200.

Attachment member 70 as an attachment (FIGS. 34 and 35) :
1, 2, and 34, a mounting member 70 can be attached to and detached from the end member 6 via an elastic member (for example, a rubber cushion member) 72 at one end and the other end of the multi-optical axis photoelectric sensor 200. It is fixed to. The attachment member 70, which is an attachment, has a through hole 70a that opens on parallel flat surfaces that oppose each other, and the multi-optical axis photoelectric sensor 200 described above is mounted on the wall using a bolt that is a fastener inserted into the through hole 70a. 64 and pillars (FIGS. 30 and 31). When the mounting member 70 is made of synthetic resin, it is preferable that a washer be interposed between the mounting member 70 and the installation surface, that is, the seating surface of the mounting member 70 when the multi-optical axis photoelectric sensor 200 is installed. By inserting a washer into the seating surface of the mounting member 70, when the synthetic resin mounting member 70 is fixed to the installation surface with a bolt, the mounting member 70 can be prevented from being damaged by the tightening torque of the bolt. . The mounting member 70 has an inclined surface 70b having an inclination angle of 45 °, and when two adjacent multi-optical axis photoelectric sensors 200 are arranged at a right angle, the two multi-optical axes are brought into contact with each other by abutting the inclined surfaces 70b. The photoelectric sensors 200, 200 can be arranged in an L shape. When this L-shaped arrangement is used, the end of two multi-optical axis photoelectric sensors 200 adjacent to each other and the pitch between the optical axes between the ends of 200 are the same as or the same as the pitch between the optical axes of the multi-optical axis photoelectric sensor 200. It is preferable to design the mounting member 70 to be smaller than that.

  The mounting member 70 has a convex portion 74 that protrudes toward the end member 6 side on the surface on the end member 6 side (FIG. 35). The convex portion 74 has a shape complementary to the above-described second concave portion 56 (FIG. 27) of the end member 6, and is detachable in the longitudinal direction of the second concave portion 56 and the multi-optical axis photoelectric sensor 200. Concave and convex are to be fitted. Since the second concave portion 56 of the end member 6 has a non-circular shape, for example, an elliptical shape when viewed from the front as seen from FIG. 27, the convex portion 74 of the mounting member 70 is also viewed from the front. It has an elliptical cross-sectional shape. Therefore, when the convex portions 74 and the second concave portions 56 are concavo-convexly fitted (FIG. 35), the rotation of the attachment member 70 is restricted by the end member 6. Thereby, the relative relationship between the axis of the through hole 70a of the mounting member 70 (the axis of the bolt inserted into the through hole 70a) and the optical axis Oa can be established with a certain promised relationship.

  The attachment member 70 is a molded product, and the material thereof may be metal, but in this embodiment, it is a synthetic resin. In the most preferable embodiment, the attachment member 70 which is an attachment has a hook 76, and using this hook 76, the attachment member 70 can be fixed to the end member 6 without a screw and with one touch. Of course, the attachment member 70 may be fixed to the end member 6 using a screw, or the attachment member 70 and the end member 6 may be formed as an integrally molded product (one-piece product).

  The end member 6 is laser-welded to the case body 4 as described above, but the end member 6 has a size such that one end of the end member 6 protrudes outward from the end surface of the case body 4 ( FIG. 35). The claw 76a of the hook 76 described above is locked to one end portion of the end member 6 protruding outward (FIGS. 35 and 36). That is, when the convex portion 74 of the mounting member 70 is pushed into the second concave portion 56 of the end member 6, the hook 76 is bent and deformed during the pushing operation, and the claw 76 a protrudes outward from the end member 6. When the mounting member 70 is pushed into the second recess 56, the claw 76a gets over the end edge of the end member 6. With this overcoming, the hook 76 is elastically restored, and the claw 76a engages with the end of the end member 6 protruding outward. This further pushing is accompanied by compressive deformation of the elastic member 72 interposed between the end member 6 and the mounting member 70. Once the hook 76 is engaged with the end member 6, the engagement state between the hook 76 and the end member 6 is maintained by the restoring force of the elastic member 72. Of course, the attachment member 70 can be removed by performing an operation of pulling out the attachment member 70 while applying an external force in the direction of expanding the hook 76.

  The elastic member 72 has a role of absorbing the expansion and contraction in the longitudinal direction accompanying the temperature change of the case body 4. For example, when the case body 4 is thermally expanded and stretched in the longitudinal direction, the elastic member 72 is compressed, so that the longitudinal stretch associated with the temperature change of the case body 4 can be absorbed.

  As is best understood from FIG. 34, the elastic member 72 is naturally formed with a through hole 72 a that allows the projection 74 of the mounting member 70 to pass therethrough. The elastic member 72 also has a slit 72b at one end thereof, that is, the end of the mounting member 70 opposite to the hook 76. The elastic member 72 is assembled to the attachment member 70 using the slit 72b.

  With reference to FIG. 34, the attachment member 70 as an attachment will be described. The attachment member 70 is formed with a projecting piece 78 at the end opposite to the hook 76. By inserting the projecting piece 78 into the slit 72 b of the elastic member 72, the elastic member 72 is prevented from dropping from the mounting member 70.

  37 and 38, the hook 76 of the attachment member 70 is formed with a cable insertion portion 76b extending in the longitudinal direction of the multi-optical axis photoelectric sensor 200 in the middle portion of the hook 76 when viewed in plan. The external cable 84 is disposed in the cable insertion portion 76b. That is, the hook 76 has a bifurcated shape when viewed in plan, and the cable 84 of the connector 82 is accommodated in the cable insertion portion 76 b of the hook 76.

  Reference numeral 80 seen in FIGS. 26, 27, etc. indicates, for example, a notch-shaped mark. Since the end member 6 is used in both the flat type sensor 200F and the slim type sensor 200S, it is preferable that at least one of the first and second marks 80a and 80b is provided on the end member 6. The first mark 80a indicates that the flat sensor 200F is on the side where the optical axis array exists. The second mark 80b indicates that the slim type sensor 200S is on the side where the optical axis array is present.

  The multi-optical axis photoelectric sensor 200 may be sold without the mounting member 70 or may be sold with the mounting member 70 assembled. When sold with the mounting member 70 already assembled as shown in FIGS. 1 and 2, the user who has obtained it can immediately install it in the manner described in FIGS. 30 and 31. Of course, since the mounting member 70 is integrated with the multi-optical axis photoelectric sensor 200, the multi-optical axis photoelectric sensor 200 is installed on the wall 64 or the column surrounding the danger source, and the installation surface is correctly referenced. In the case of the surface, the multi-optical axis photoelectric sensor 200 can be operated immediately after being installed without adjusting the optical axis of the multi-optical axis photoelectric sensor 200. In the conventional installation work using the mounting bracket, the optical axis adjustment work is indispensable even if the wall 64 or the column is provided with an installation surface that is correctly referenced. On the other hand, in the multi-optical axis photoelectric sensor 200 according to the embodiment, the multi-optical axis photoelectric sensor with the mounting member 70 obtained by the user is shipped by shipping the multi-optical axis photoelectric sensor 200 in which the mounting member 70 is assembled in advance. It can be operated immediately after the sensor 200 is installed. Moreover, the installation work of the multi-optical axis photoelectric sensor 200 can be simplified. This is one of the advantages that the mounting member 70 and the optical axis Oa are designed with a common reference (end member 6).

  In particular, in the multi-optical axis photoelectric sensor 200 of the embodiment, as described above, the optical component 8, that is, the optical axis Oa is positioned with reference to the end member 6, and the mounting member 70 is positioned with reference to the end member 6. Therefore, the attachment member 70 is in alignment with the optical axis Oa via the end member 6. This is also a factor that can greatly contribute to the ease of installation work using the mounting member 70 of the multi-optical axis photoelectric sensor 200 described above.

Cable connection (Fig. 1, Fig. 2, Fig. 37) :
Reference numeral 82 shown in FIGS. 1 and 2 indicates an external connector. 1 and 2, a plurality of multi-optical axis photoelectric sensors 200 and a control device are electrically connected by a cable 84 (FIG. 37) extending from the external connector 82. The cable 84 may be integrated with the multi-optical axis photoelectric sensor 200. In this case, the cable 84 is preferably extended in and out of the multi-optical axis photoelectric sensor 200 through the through hole of the end member 6.

  As best understood from FIGS. 29 and 35, a manual switch 86 is disposed adjacent to the connector pin 34 a of the expansion connector board 34. The manual switch 86 is constituted by a slide type switch, and the operation mode of the multi-optical axis photoelectric sensor 200 can be switched by the switch 86. The case body 4 has a connector opening 88 for receiving the external connector 82 at a position facing the connector pin 34a, and a manual switch 86 is attached to one end of the connector opening 88 (FIG. 37).

  The main body of the external connector 82 is a molded product of synthetic resin, and the external connector 82 is configured by incorporating a connector part 82a (FIG. 37) therein. The external connector 82 has an elongated box shape having a width dimension slightly shorter than the short side 4S of the case body 4 of the multi-optical axis photoelectric sensor 200. A cover member 90 is prepared separately from the external connector 82. The cover member 90 surrounds the upper surface and both side surfaces of the external connector 82.

Cover member 90 (FIGS. 39 and 40) :
FIG. 39 is a perspective view of the cover member 90 for external connectors. The external connector cover member 90 is formed by press-molding a metal plate material. The cover member 90 has a top surface 90a corresponding to the upper surface of the external connector 82, and leg portions 90b extending downward from both side edges of the top surface 90a. The leg portions 90b are height dimensions of the external connector 82. Has a larger height dimension. A claw 90c that is bent inward is formed at the lower end of the leg 90b. The top surface 90 a is formed with two spring pieces 90 d formed by cutting and raising, and the two spring pieces 90 d and 90 d are arranged apart from each other in the longitudinal direction of the external connector 82.

  The external connector cover member 90 is attached to the case body 4 in advance (FIG. 40). This mounting is performed by engaging the claw 90c of the cover member 90 with the groove 4c of the case body 4. The cover member 90 attached to the case body 4 is slidable in the longitudinal direction of the multi-optical axis photoelectric sensor 200 while being guided by the groove 4c.

  As best understood from FIG. 38, the external connector 82 has a length dimension and a width dimension that can completely cover the connector opening 88 of the case body 4. Reference numeral 82c in FIG. 37 indicates a recess formed in the bottom surface of the external connector 82, and a sealing material (water blocking packing) (not shown) is attached to the recess 82c. After the external connector 82 is connected to the multi-optical axis photoelectric sensor 200, the external connector cover member 90 is slid so that the external connector 82 is surrounded by the cover member 90. In the state where the external connector 82 is surrounded by the cover member 90, the cover member 90 can prevent the external connector 82 from coming out of the multi-optical axis photoelectric sensor 200.

  Further, the sealing material attached to the recess 82 c of the external connector 82 is in close contact with the periphery of the connector opening 88 of the case body 4. This close contact state is maintained by the two spring pieces 90d (FIG. 39) of the connector cover member 90 described above. That is, the external connector 82 is urged in the direction approaching the case main body 4 by the spring piece 90 d of the cover member 90. A virtual line 92 in FIG. 37 indicates an IP line. It can be seen from FIG. 37 that this IP line surrounds the connector connecting portion and the manual switch 86 for mode switching.

  As a modification of the cover member 90, after connecting the external connector 82 to the multi-optical axis photoelectric sensor 200, the cover member 90 is attached, and the claw 90 c of the cover member 90 is snapped into the groove portion 4 c of the case body 4. You may employ | adopt the structure to do.

  The cover member 90 described above is merely an example. Further, the technical idea of sealing the connector opening 88 of the case body 4 while preventing the external connector 82 from coming off is not limited to the case where the case body 4 is an extrusion molded product. Any sensor case made of metal or synthetic resin provided with the connector opening 88 can be applied thereto. If it demonstrates in said example, the cover member 90 has the latching | locking part (claw 90c) which can be engaged / disengaged with the case main body 4, and is snap-fitted with the case main body 4 by this latching | locking part. Therefore, the case body 4 only needs to have a stepped portion (groove portion 4c) that engages with the locking portion (claw 90c) of the cover member 90. In addition, if the structure which unites the cover member 90 with the external connector 82 not by snap fitting but a sliding method is employ | adopted, the spring property of the leg part 90b of the cover member 90 is not essential, and the leg part 90b has spring property. It does not have to be provided.

  Further, in the above example, a configuration in which the external connector 82 is urged in the pushing direction by the spring piece 90d formed by cutting and raising the top 90a of the cover member 90 is employed. A member (rubber) may be disposed and urged in the direction in which the external connector 82 is pushed by the elastic member.

  Of course, the cover member 90 is formed by pressing a metal plate from the viewpoint of cost, but may be a molded product of synthetic resin. In the above embodiment, as described above, the external connector 82 is provided with the recess 82c, the seal material is attached to the recess 82c, and the seal material is brought into close contact with the case body 4. However, a configuration in which a seal material is attached to the case body 4 side may be employed.

Protective cover 100 (FIGS. 41 and 42) :
Since the case body 4 of the multi-optical axis photoelectric sensor 200 is made of synthetic resin, it is preferable to attach the protective cover 100 in order to avoid damage after installation. FIG. 41 shows a protective cover 100F for the flat sensor 200F. FIG. 42 shows a protective cover 100S for the slim type sensor 200S. Both of these protective covers 100F and 100S are formed by press-molding a metal plate, and fixing to the multi-optical axis photoelectric sensor 200 is preferably performed using dedicated mounting screws.

  The protective covers 100F and 100S are formed with a window 102 through which detection light and indicator light can pass, and a cross-section L so that the detection surface of the multi-optical axis photoelectric sensor 200 and the surface adjacent thereto can be covered. It has a letter shape. Of course, it is preferable to prepare dedicated protective covers 100F and 100S according to the length of the multi-optical axis photoelectric sensor 200.

  The preferred embodiments of the present invention have been described above. In the embodiment described above, when all the optical axes of one multi-optical axis photoelectric sensor 200 are light receiving elements, the multi-optical axis photoelectric sensor 200 functions as a light receiver, and all the optical axes are light projecting elements. The multi-optical axis photoelectric sensor 200 functions as a projector. As a modification thereof, half of the optical element 26 included in one multi-optical axis photoelectric sensor 200 is configured by a light receiving element, and the remaining half is configured by a light projecting element. A structure that functions as a light receiver and the remaining half functions as a projector may be adopted.

200 Multi-Optical Photoelectric Sensor 200F Flat Type Sensor 200S Slim Type Sensor 2 Case 4 Case Body 4c Groove 6 End Member 8 Optical Component 14 Rigid Member (Aggregate or Frame)
16 Optical unit (comprising optical components)
Oa Optical axis 20 Optical element substrate 26 Optical element 70 Mounting member 70a Through hole 70b Inclined surface 72 Elastic member

Claims (11)

A multi-optical axis photoelectric sensor having a plurality of optical axes arranged at a predetermined optical axis pitch in the longitudinal direction,
An elongated case body with both ends open;
An end member made of a molded product attached to one end and the other end of the case body, and closing the opening of each end;
An optical component disposed from one end of the case body to the other end, the optical component for defining the spread angle of each optical axis,
The optical component and the end member can be displaced in the longitudinal direction, and the optical component and the end member are concavo-convexly fitted so as not to be relatively rotatable.
A multi-optical axis photoelectric sensor in which a through hole is formed in the end member and can be fixed to an installation surface with a fastener inserted through the through hole. The end member has an inclined surface having an angle of 45 degrees with respect to the longitudinal direction of the multi-optical axis photoelectric sensor;
The multi-optical axis according to claim 1, wherein the two multi-optical axis photoelectric sensors can be arranged in an L shape by abutting the inclined surfaces of the end members of two adjacent multi-optical axis photoelectric sensors. Photoelectric sensor.   When the two multi-optical axis photoelectric sensors adjacent to each other are arranged in an L shape, the optical axis pitch between the ends of the two multi-optical axis photoelectric sensors is the light of the multi-optical axis photoelectric sensor. The multi-optical axis photoelectric sensor according to claim 2, wherein the multi-optical axis photoelectric sensor is equal to or smaller than the axial pitch.   The end member includes a first member that closes an opening at each end of the case body, and a second member that includes the through hole, and the first member and the second member cannot be rotated relative to each other. The multi-optical axis photoelectric sensor according to claim 1, wherein the multi-optical axis photoelectric sensor is integrated with the multi-optical axis photoelectric sensor.   The multi-optical axis photoelectric sensor according to claim 4, wherein an elastic member that is compressible in a longitudinal direction of the multi-optical axis photoelectric sensor is interposed between the first member and the second member.   The multi-optical axis photoelectric sensor according to claim 5, wherein the case body is an extruded product made of a synthetic resin.   The multi-optical axis photoelectric sensor according to claim 6, wherein the case body has a closed cross section.   The multi-optical axis photoelectric sensor according to any one of claims 1 to 7, wherein the optical component includes a plurality of optical units, and each optical unit has a plurality of optical axes. A rigid member extending continuously in the longitudinal direction from one end of the multi-optical axis photoelectric sensor to the other end;
The multi-optical axis photoelectric sensor according to claim 8, wherein the optical unit is positioned on the rigid member.   The multi-optical axis photoelectric sensor according to claim 9, wherein the rigid member is configured by a frame made of a metal plate formed in a three-dimensional shape. An optical element substrate fixed to the optical unit;
The multi-optical axis photoelectric sensor according to claim 10, wherein an optical element is mounted on the optical element substrate.

Images