JP5872417B2 - Photoelectric sensor - Google Patents

Description

  The present invention relates to a photoelectric separation type sensor comprising a light transmitter having an optical bench in which a light emitting element is accommodated and a light receiver having an optical bench in which a light receiving element is accommodated in a monitoring space. It is.

In the photoelectric separation type sensor, a light transmitter having an optical stand accommodating a light emitting element and a light receiver having an optical bench accommodating a light receiving element are usually 5 to 100 m at a high place (usually 10 to 15 m above the ground). Are arranged opposite to each other with a monitoring distance therebetween. The photoelectric separation type sensor senses the presence of smoke by detecting the attenuation of light caused by the occurrence of fire and the presence of smoke due to fire between the transmitter and the receiver.
Since the light transmitter and the light receiver are installed at a long distance, it is necessary to adjust the optical axes of the light transmitter and the light receiver so that they match in the installed state.
For this reason, in a general photoelectric separation type sensor, the optical bench is provided so as to be rotatable in the vertical and horizontal directions with respect to the main body, and the optical axis is adjusted by adjusting the amount of rotation. And an optical axis adjusting means.
For example, there is a photoelectric separation type sensor disclosed in Patent Document 1. The optical stand of the photoelectric separation type sensor of Patent Document 1 is installed so as to be rotatable in the vertical direction by the optical stand support frame, and the optical stand support frame is installed so as to be rotatable in the horizontal direction with respect to the main body. Yes. By doing so, the optical bench can be rotated in the vertical and horizontal directions (see paragraph [0069] of Patent Document 1).
Further, the photoelectric separation type sensor of Patent Document 1 has an adjustment screw as an optical axis adjustment means, and an adjustment spring that urges each of the optical bench and the optical bench support frame to rotate in a certain direction. doing.

In order to install the optical bench support frame in a rotatable manner, it is necessary that a slight play be formed in the rotation support portion. This means that rattling occurs. For this reason, there is a possibility that the optical axis is shifted due to vibration or the like after the optical axis is adjusted.
In this regard, in Patent Document 1, the optical stand support frame of the photoelectric separation type sensor is supported so as to be pivotable by a pivot shaft provided vertically, and the optical bench support frame is centered on the upper and lower shaft portions. The occurrence of rattling is prevented by installing a support spring that presses in the direction (see paragraph [0069] of Patent Document 1).

JP 2006-268868 A

However, the photoelectric separation type sensor disclosed in Patent Document 1 supports the optical bench support frame at the top and bottom and requires a dedicated support spring to prevent the optical bench support frame from rattling. There is a problem that it is complicated.
The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a photoelectric separation type sensor that has a simple structure and prevents the optical bench support frame from rattling.

(1) In the photoelectric separation type sensor according to the present invention, a light transmitter having an optical stage in which a light emitting element is accommodated and a light receiver having an optical stage in which a light receiving element is accommodated are arranged opposite to each other in a monitoring space. In the photoelectric separation type sensor
An optical bench support frame that holds the optical bench and is installed on the instrument stand so as to be rotatable around a shaft portion;
Horizontal angle adjusting means for adjusting the horizontal optical axis of the optical bench by rotating the optical bench support frame in the horizontal direction;
The horizontal angle adjusting means includes a horizontal angle adjusting spring that applies horizontal rotational force to the optical bench support frame and presses the optical bench support frame so as to tilt forward. Is.

(2) Further, in the above (1), the optical bench support frame is placed on a flat washer installed on a table.

  In the present invention, an optical bench support frame that holds the optical bench and is rotatably installed around the shaft portion on the instrument stand, and the optical bench support frame is rotated in the horizontal direction so that the optical bench is Horizontal angle adjusting means for adjusting the optical axis in the horizontal direction, the horizontal angle adjusting means applies horizontal turning force to the optical bench support frame and presses the optical bench support frame so as to tilt forward. Since it has an angle adjustment spring, the horizontal angle adjustment spring forcibly presses in the direction that tilts the optical bench support frame forward, so that the optical bench support frame is always held in a predetermined posture. Even if there is play in the rotating part of the frame, there is no play. In addition, the horizontal angle adjustment spring combines the action of applying horizontal turning force to the optical bench support frame and the pressing action to prevent rattling, thus preventing rattling with a simple structure. it can.

It is a perspective view of the light transmitter of the photoelectric separation type sensor concerning one embodiment of the present invention. It is explanatory drawing explaining the whole structure of the photoelectric separation-type sensor concerning one embodiment of this invention. It is a front view of the light transmitter of FIG. It is a right view of the light transmitter of FIG. It is AA arrow sectional drawing of the light transmitter of FIG. It is a disassembled perspective view of the light transmitter of FIG. It is a perspective view of the main body of the light transmitter of FIG. It is a perspective view of the components which comprise the light transmitter of FIG. 1 (the 1). It is a perspective view of the components which comprise the light transmitter of FIG. 1 (the 2). It is a perspective view of the components which comprise the light transmitter of FIG. 1 (the 3). It is explanatory drawing explaining the operation | movement of a part of optical axis adjustment means of the light transmitter of FIG. 1 (the 1). It is explanatory drawing explaining the state at the time of conveyance of the light transmitter of FIG. It is explanatory drawing explaining the installation method of the light transmitter of FIG. 1 (the 1). It is explanatory drawing explaining the installation method of the light transmitter of FIG. 1 (the 2). It is explanatory drawing explaining the optical axis adjustment method of the light transmitter of FIG. It is a perspective view of the other aspect of the light transmitter of FIG. It is a front view of the light transmitter of FIG. FIG. 6 is an explanatory diagram for explaining the operation of a part of the optical axis adjusting means of the light transmitter in FIG. 1 (No. 2). It is a perspective view of the other aspect of the light transmitter of FIG. 1, FIG. It is a perspective view of the components which comprise the light transmitter of FIG. It is explanatory drawing explaining the one part operation | movement of the optical axis adjustment means of the light transmitter of FIG.

A photoelectric separation type sensor 1 according to an embodiment of the present invention will be described mainly based on FIGS. 1 to 10 and with reference to other drawings as needed.
As shown in FIG. 2, the photoelectric separation type sensor 1 includes a light transmitter 3 having an optical bench 23 in which a light emitting element 21 (see FIG. 3) is housed, and an optical bench 23 in which a light receiving element 22 is housed. The photoreceiver 5 is disposed opposite to the monitoring space. The light transmitter 3 and the light receiver 5 have almost the same configuration except for the light emitting element 21 and the light receiving element 22 and related circuits. Therefore, in the following description, the light transmitter 3 will be described as an example. .

As shown in FIGS. 1 and 3 to 6, the light transmitter 3 includes a substantially L-shaped L-shaped member 7 and a table mounted on the lower surface side of the horizontal surface portion 7 b (pedestal) of the L-shaped member 7. 11, a base 15 that is attached to the wall side of the building and installs the main body 13, a cover 17 (see FIGS. 2 and 12) of a bottomed frame that covers the main body 13, and a vertical section An optical table support frame 19 that is substantially U-shaped and is mounted on the upper surface of the horizontal surface portion 7b of the main body 13 so as to be rotatable in the horizontal direction, and is attached to the optical table support frame 19 so as to be rotatable in the vertical direction. The optical bench 23 for accommodating the light emitting element 21, the horizontal angle adjusting means 25 for adjusting the horizontal pivot angle (horizontal angle) of the optical bench 23, and the vertical pivot angle (vertical) of the optical bench 23. Vertical angle adjusting means 27 for adjusting the angle. 1 and 3 to 5 show a state where the cover 17 is removed.
Each of the above configurations will be described in detail below with reference to FIGS.

<Main body>
As shown in FIG. 7, the main body 13 is provided on the lower surface side of the horizontal surface portion 7b of the L-shaped member 7 such as an L-shaped member 7 that is formed by bending a rectangular wide plate into a substantially L shape, and the substrate 9 and the like. And a flat box-shaped table 11 for accommodating (see FIG. 5).
Locking holes 31 for locking the main body 13 to the base 15 at the time of installation are provided at the upper corners of the vertical surface portion 7a, which is the vertical portion of the L-shaped member 7. The locking hole 31 includes a rectangular portion 31a having a size that allows the head of the body locking screw 33 to pass through, and a narrow portion 31b that is provided above the rectangular portion 31a and is narrower than the rectangular portion 31a.
A fixed shaft 37 is provided at the lower portion of the elevating surface portion 7a. The fixed shaft 37 is formed in a bar shape projecting forward in the horizontal direction and fixed to the main body 13. The fixed shaft 37 is a horizontal shaft formed of a string-wound spring having a predetermined length. The angle adjusting spring 35 is inserted.
The fixed shaft 37 according to the embodiment of the present invention is at a height of about one fifth of the height of the vertical surface portion 7a from the horizontal surface portion 7b, and from the vertical line passing through the center of the vertical surface portion 7a. Located on the right side when viewed from the side. Note that the position of the fixed shaft 37 is not limited to this position, and is a position where the horizontal angle adjusting spring 35 can press above the screw 85 in the optical bench support frame 19 placed on the L-shaped member 7. I need it.
At the center of the horizontal surface portion 7b of the L-shaped member 7, a support shaft 39 is inserted into a later-described rotation hole 81 of the optical bench support frame 19 to support the optical bench support frame 19 so as to be rotatable in the horizontal direction. Is provided. A screw hole 39 a is provided at the center of the support shaft 39. A flat washer 41 for smooth rotation of the optical bench support frame 19 is inserted into the support shaft 39.
A support 43 serving as a support member that supports the vicinity of the head of a horizontal angle adjusting male screw 89 to be described later is provided on the right side corner on the front side of the horizontal surface portion 7 b of the L-shaped member 7. A circular insertion hole 43 a is provided at the center of the support portion 43.
In the embodiment of the present invention, the position and direction (for example, right side, back side, etc.) are shown with the lens 91 of the optical bench 23 as the front.

As shown in FIGS. 3 and 4, a connector portion 11 a for connecting the wiring 111 from the wall side is provided at a position near the front surface of the lower surface of the instrument base 11.
As shown in FIG. 5, a guide surface 11 b that is inclined from the back side to the front side and guides the wiring 111 is formed at the center of the back surface of the instrument base 11. The guide surface 11b is located between temporary installation portions 45 to be described later, and is formed of a tapered surface inclined inward from the back surface of the horizontal surface portion 7b of the main body 13. In other words, the guide surface 11b is located below the back surface of the main body 13 and is a tapered surface that is inclined from the back side (base side) toward the near side (front side). That is, the space between the main body 13 and the base 15 is extended downward by the guide surface 11b, and the guide surface 11b guides the wiring 111 provided from the opening of the base 15 toward the main body 13 downward. To do.
Moreover, the temporary installation part 45 for temporarily installing the main body 13 in the base 15 which the vertical wall of the back side of the instrument base 11 extended below is provided in the both ends of the lower part at the back side of the instrument base 11 is provided. It has been. Reinforcing plates 45a that prevent the temporary installation portion 45 from being bent are provided at both ends of the temporary installation portion 45 (see FIG. 4). The temporary installation portion 45 is provided with a dharma hole 45b (see FIG. 3).

<Base>
The base 15 is installed on the wall side by fixing the base 15 to a switch box (not shown) on the wall side of a building or the like.
As shown in FIG. 8, the base 15 has a rectangular bottomed frame shape, and a projecting portion 51 that projects forward is formed on the lower side portion. The overhanging portion 51 is provided with a hook 51a for hooking the cover 17 when the cover 17 is opened. The hooks 51a are provided at both ends of the projecting portion 51, and are formed so as to be folded upward from the near side to the far side (base side) when viewed from the front side, and the upper part on the far side is open. Accordingly, a hook shaft 63 of the cover 17 described later can be inserted into the hook 51a from above.
A wiring window 53 having a large opening is provided at the center of the base 15 so that the wiring 111 can be drawn from the wall side. A plurality of dharma holes 55 for installation in a switch box or the like are provided in the outer peripheral portion of the wiring window 53.
A screw hole 57 to which the main body locking screw 33 is attached is provided at the upper corner of the base 15. The main body locking screw 33 is not completely screwed in, and the plate of the elevation surface portion 7a of the main body 13 is located between the head of the main body locking screw 33 and the surface of the base 15 having the screw holes 57. A gap of about the thickness is made.

<Cover>
As shown in FIGS. 2 and 12, the cover 17 is formed of a deep bottomed frame body, and has a cutout portion 61 that is cut out in a rectangular shape on the lower surface. The overhang portion 51 can be inserted. On the inner wall surfaces on both sides of the notch 61 of the cover 17, there are hooking shafts 63 that protrude inwardly at the corners on the opening side and are hooked on the hooks 51 a of the base 15. In other words, the hook shaft 63 is provided on the back side (base side) of the lower end of the inner wall on both side surfaces when viewed from the front side.

<Optical stand support frame>
The optical bench support frame 19 is substantially U-shaped as shown in FIG.
A shaft hole 71 for rotatably supporting the optical bench 23 is provided at the upper end of the compatible side portion 19a extending in the vertical direction of the optical bench support frame 19.
As shown in FIGS. 9 (a) and 9 (b), a vertical angle adjustment spring comprising a compression chord spring extending inward of the optical bench support frame 19 is provided at the tip of the right side portion 19a as viewed from the front. A spring support portion 75 for supporting 73 from below is formed.
At the center of the spring support portion 75, a vertical angle adjusting female screw 75a is formed which is screwed with a vertical angle adjusting male screw 77 made of a male screw of a predetermined length.
A horizontal reaction force receiving portion 79 that extends inward of the optical bench support frame 19 and receives a reaction force of a horizontal angle adjusting spring 35 that is a compression chord spring is formed below the right side edge portion 19a. Is formed. The horizontal reaction force receiving portion 79 has a horizontally elongated hole 79a into which the tip of the fixed shaft 37 inserted from the back side (base side) of the elevation surface portion 7a of the L-shaped member 7 of the main body 13 is inserted.

A rotation hole 81 is provided at the center of the bottom part 19 b extending in the horizontal direction of the optical bench support frame 19, and the support shaft 39 of the main body 13 is inserted into the rotation hole 81. The optical bench support frame 19 is screwed into the screw hole 39a of the support shaft 39 by a screw 85 having a press washer 83 attached thereto (see FIGS. 1, 3, 5, and 6).
As shown in FIG. 4, a gap S is provided between the bottom portion 19b and the horizontal plane portion 7b of the main body 13 by a flat washer 41 installed on the main body 13 side of the support shaft 39. The movement is designed to be smooth.
As shown in FIGS. 9 (a) and 9 (b), the right portion on the front side of the bottom side portion 19b of the optical bench support frame 19 extends by a predetermined length toward the front side, and the extension portion. It has the standing part 87 which the right side of stands upright. As shown in FIG. 9B, the standing portion 87 stands so that the front side faces inward in a plan view.
The upright portion 87 is formed with a horizontally long insertion hole 87a through which a horizontal angle adjusting male screw 89 made of a male screw having a predetermined length is inserted.

<Optical stand>
As shown in FIG. 10, the optical bench 23 has a flat cylindrical shape.
A lens 91 is mounted on the front surface of the optical bench 23 to deliver the light of the light emitting element 21 to a distant place (in the case of the light receiver 5, to collect the light on the light receiving element 22). Inside, the light emitting element 21 (in the case of the light receiver 5, the light receiving element 22) is accommodated (see FIGS. 2 and 3). As shown in FIGS. 3 and 6, a substrate 93 is attached to the rear surface.

  On the right side of the optical bench 23, a small-diameter projection 95 projecting outward is provided. A screw hole is provided on the left side of the optical bench 23 coaxially with the protrusion 95. The protrusion 95 of the optical bench 23 is inserted into a shaft hole 71 provided in the right side portion 19 a of the optical bench support frame 19, and the left side of the optical bench support frame 19 is inserted into the left screw hole of the optical bench 23. A screw 97 inserted through a shaft hole 71 provided in the portion 19a is screwed (see FIG. 3). By doing so, the optical bench 23 can be rotated about the projection 95 and the screw 97 as axes.

On the front side of the upper part of the optical bench 23, a collimation piece 99 is provided. The collimation piece 99 is provided with a collimation hole 99a so as to coincide with the direction of the optical axis L. More specifically, the collimation hole 99a is provided in the vertical direction in the depth direction of the optical stage 23 through the light emitting element 21 (in the case of the light receiver 5) the upper part of the optical stage 23. . On the back side of the collimation piece 99, a reflecting mirror 100 that is inclined to the right is provided (see FIGS. 1 and 2; FIG. 10 shows a state in which the reflecting mirror 101 is removed). In addition, on the front side of the upper right portion of the optical bench 23, a peep piece 101 having a peep hole 101a through which a collimation hole 99a reflected in the reflecting mirror 100 can be peeped is provided. The viewing hole 101a is located at the right end of the upper part of the optical bench 23, in other words, at the upper end of the right side surface (upper side surface).
On the back side of the upper right portion of the optical bench 23, a vertical reaction force receiving portion 103 is provided which is a small piece protruding outward and in the horizontal direction. The vertical reaction force receiving portion 103 is provided with an insertion hole 103 a for a male screw 77 for adjusting the vertical angle. The vertical direction reaction force receiving portion 103 and the viewing hole 101a are formed of the same member.

<Horizontal angle adjustment means>
The horizontal angle adjusting means 25 includes a horizontal angle adjusting spring 35, a horizontal angle adjusting male screw 89 whose head is an operating portion, and a horizontal angle regulating member 105 made of a horizontally long plate piece. The horizontal angle of the optical bench 23 is adjusted by adjusting the distance from the standing portion 87 of the optical bench support frame 19.
Hereinafter, the horizontal angle adjusting spring 35, the horizontal angle regulating member 105, and the configuration thereof will be described in detail.

≪Spring for horizontal angle adjustment≫
As described above, the horizontal angle adjusting spring 35 is composed of a compression string spring having a predetermined length, and has a diameter through which the fixed shaft 37 of the main body 13 can be inserted. The diameter of the horizontal angle adjusting spring 35 is formed larger than the diameter in the vertical direction of the laterally long hole 79a of the horizontal direction reaction force receiving portion 79 so as not to be inserted into the laterally long hole 79a. As shown in FIGS. 1, 5, and 6, the horizontal angle adjusting spring 35 is inserted through the fixed shaft 37 of the main body 13, and receives the horizontal reaction force between the vertical surface portion 7 a of the main body 13 and the optical bench support frame 19. The portion 79 is sandwiched and compressed. In this way, a repulsive force that pushes the optical bench support frame 19 forward is generated. Since the optical bench support frame 19 is rotated in the horizontal direction by the support shaft 39, the repulsive force causes the optical bench support frame 19 (optical bench 23) to rotate clockwise in plan view. It is working.

Further, as shown in FIG. 5, the horizontal angle adjusting spring 35 is attached above the support shaft 39 that rotatably supports the bottom portion 19b, so that the connecting portion between the support shaft 39 and the screw 85 is provided. The repulsive force of the horizontal angle adjusting spring 35 acts as a fulcrum and also acts in the direction in which the optical bench support frame 19 is slightly tilted forward (see the arrow in FIG. 5). Since the optical table support frame 19 is rotatably installed, a slight play is formed in the rotation support part. However, when the optical table support frame 19 is pushed forward by the horizontal angle adjusting spring 35, the optical table is supported. The support frame 19 is always held in a forward inclined posture to prevent the support frame 19 from rattling back and forth.
Even when the optical axis is adjusted and the hand hits the optical bench 23 and tilts backward, the optical bench support frame 19 is pushed forward by the horizontal angle adjusting spring 35 so that the optical bench 23 is moved to its original position. You can return to That is, the horizontal angle adjusting spring 35 always holds the optical bench support frame 19 in a predetermined posture. Accordingly, it is not necessary to provide a dedicated mechanism for preventing the optical bench support frame 19 from shaking back and forth, and as described above, the flat washer 41 is attached between the main body 13 and the optical bench support frame 19. Even if the gap S is provided, it is possible to improve the rotation without rattling.

≪Horizontal angle regulating member≫
As shown in FIG. 6, the horizontal angle regulating member 105 is composed of a horizontally long plate piece. At the center of the horizontal angle regulating member 105, a convex portion 105a that is inserted into the horizontally long insertion hole 87a and is movable to the left and right of the horizontally long insertion hole 87a is provided. At the center of the convex portion 105a, a horizontal angle adjusting female screw 105b screwed with the horizontal angle adjusting male screw 89 is provided.
As shown in FIG. 1, the horizontal angle adjusting male screw 89 is provided in the insertion hole 43 a provided in the support portion 43 of the main body 13 from the right side of the main body 13 and the standing portion 87 of the optical bench support frame 19. The horizontal angle restricting member 105 is attached to the distal end side of the horizontal angle adjusting male screw 89 through the horizontally long insertion hole 87a. As described above, the optical bench support frame 19 is configured so that the horizontal reaction force receiving portion 79 is rotated from the right side to the left side (clockwise) by the horizontal angle adjusting spring 35. The portion 87 is always pressed against the horizontal angle regulating member 105. The upright portion 87 is formed so as to be inclined toward the right side as it goes from the front to the back.

  When the horizontal angle adjusting male screw 89 is rotated, the horizontal angle regulating member 105 is horizontally long so that it does not turn against the bottom 19b of the optical bench support frame 19. More specifically, the horizontal angle restricting member 105 is a part of the bottom part 19b, is on the right side of the bottom part 19b, and extends from the front side by a predetermined length, that is, the standing part 87 and It is prevented from rotating by hitting the bottom side 19b near the contact. Accordingly, the horizontal angle regulating member 105 moves in the screw axis direction on the horizontal angle adjusting male screw 89 as the horizontal angle adjusting male screw 89 rotates. When the horizontal angle regulating member 105 moves and the distance between the support portion 43 of the main body 13 changes, the distance between the upright portion 87 of the optical bench support frame 19 and the support portion 43 of the main body 13 changes accordingly. Become. When the horizontal angle regulating member 105 moves and the distance from the support portion 43 of the main body 13 decreases, the distance between the standing portion 87 of the optical bench support frame 19 pressed against the horizontal angle regulating member 105 and the support portion 43 of the main body 13. Will also shrink. On the other hand, when the horizontal angle restricting member 105 moves to increase the distance from the support portion 43 of the main body 13, the optical stand support frame 19 is rotated in the clockwise direction by the horizontal angle adjusting spring 35 and the upright portion 87. The distance of the support part 43 of the main body 13 also increases. By doing so, the rotation angle of the optical bench support frame 19 can be changed. That is, the rotation angle of the optical bench support frame 19 is regulated by the horizontal angle regulating member 105, and the relative position of the horizontal angle regulating member 105 to the optical bench support frame 19 is adjusted by adjusting the horizontal angle adjusting male screw 89. Is adjusted, and the horizontal rotation angle of the optical bench support frame 19 is adjusted.

The rotation of the optical bench support frame 19 accompanying the rotation of the horizontal angle adjusting male screw 89 will be described in detail with reference to FIG. FIG. 11 is an explanatory view for explaining the relative relationship between the horizontal angle adjusting male screw 89 and the horizontal angle regulating member 105, showing a state in which the horizontal angle adjusting male screw 89 and the horizontal angle regulating member 105 are viewed in plan view. Yes.
FIG. 11A shows a state in which the horizontal angle adjusting male screw 89 is rotated in the loosening direction with reference to the state of FIG. 11B. At this time, since the distance between the horizontal angle regulating member 105 and the support portion 43 of the main body 13 increases, the force that the horizontal angle adjusting spring 35 pushes the horizontal reaction force receiving portion 79 that is a part of the optical bench support portion 19 forward. As a result, the optical bench support frame 19 is rotated clockwise (see the arrow in FIG. 11A) in a plan view.

On the other hand, FIG. 11C shows a state in which the horizontal angle adjusting male screw 89 is rotated in the tightening direction with the state of FIG. 11B as a reference. At this time, since the distance between the horizontal angle restricting member 105 and the support portion 43 of the main body 13 is narrowed, the optical stand support frame 19 is rotated counterclockwise in plan view when the upright portion 87 is pushed by the horizontal angle restricting member 105 (see FIG. 11 (c) (see arrow).
Thus, when the optical bench support frame 19 rotates, the convex portion 105a (the horizontal angle adjusting male screw 89) of the horizontal angle regulating member 105 moves in the horizontally long insertion hole 87a, so that the optical bench support frame 19 is moved. The rotation is smooth.

  Further, as described above, the standing portion 87 of the optical bench support frame 19 is always pressed against the horizontal angle regulating member 105 by the urging force of the horizontal angle adjusting spring 35, and the standing portion with which the horizontal angle regulating member 105 abuts. A surface of the 87 on the horizontal angle regulating member 105 side is a contact surface. That is, the contact surface is a friction surface where a frictional force is generated. The friction force increases in proportion to the force in the direction perpendicular to the friction surface. In the present embodiment, the urging direction of the horizontal angle adjusting spring 35 is an axial direction of the horizontal angle adjusting spring 35 and is a direction in which the optical bench support 19 is pushed to the front side, and the urging direction is Since it is substantially parallel to the contact surface (friction surface), the force in the orthogonal direction of the contact surface (friction surface) is small. Therefore, compared with the case where the urging direction is orthogonal to the contact surface (friction surface), the pressing force with which the horizontal angle restricting member 105 is pressed against the standing portion 87 is reduced, and the friction force of the contact surface is kept low. Can do. Therefore, the optical bench support frame 19 is smoothly rotated, and an accurate horizontal angle adjustment is possible.

  When the deviation angle of the urging direction from the direction perpendicular to the contact surface is closer to 90 °, the pressing force is reduced and the frictional force of the contact surface can be reduced, and the displacement angle is 90 °. Since the urging direction and the contact surface are parallel, the frictional force of the contact surface can be minimized. The deviation angle when the optical bench 23 is directed to the front is preferably in the range of 45 ° to 90 °, and more preferably in the range of 70 ° to 90 °.

<Vertical angle adjustment means>
The vertical angle adjusting means 27 includes a vertical angle adjusting spring 73 and a vertical angle adjusting male screw 77 whose head is an operation unit, and a vertical reaction force between the spring support 75 of the optical bench support frame 19 and the optical bench 23. By adjusting the distance of the receiving portion 103, the vertical angle of the optical bench 23 is adjusted.
Hereinafter, the vertical angle adjusting spring 73, the vertical angle adjusting male screw 77, and the configuration thereof will be described in detail.

The vertical angle adjusting spring 73 is a compression string spring having a predetermined length, and has a diameter through which the vertical angle adjusting male screw 77 can be inserted. Further, the diameter of the vertical angle adjusting spring 73 is formed to be larger than the length of the short side of the insertion hole 103a having a long hole shape.
The vertical angle adjusting male screw 77 is such that the head of the vertical angle adjusting male screw 77 is disposed near the peeping hole 101a (on the back side of the peeping hole 101a), and is perpendicular to the vertical reaction force receiving portion 103 from above. The directional reaction force receiving portion 103 is inserted into the insertion hole 103 a and the vertical angle adjusting spring 73 and is screwed into a vertical angle adjusting female screw 75 a provided in the spring support portion 75.

When the vertical angle adjusting male screw 77 is tightened, the distance between the vertical reaction force receiving portion 103 and the spring support portion 75 is shortened. At this time, since the optical bench 23 is rotated in the vertical direction with the projection 95 and the screw 97 as the rotation axis, the optical bench 23 is directed upward (in a backward tilt direction), that is, the optical axis is directed upward. It rotates as follows.
The vertical angle adjusting spring 73 is compressed by being sandwiched between the vertical reaction force receiving portion 103 and the spring support portion 75, and in the direction of pushing up the optical bench 23 (the vertical reaction force receiving portion 103 and the spring support portion. The repulsive force (in the direction of increasing the distance to 75) is generated. Therefore, if the vertical angle adjusting male screw 77 is loosened, the repulsive force of the spring causes the optical bench 23 to turn in a side view (direction to tilt forward), that is, to turn the optical axis downward.

A method for installing the light transmitter 3 configured as described above and a method for adjusting the optical axis will be described.
<Installation method>
When installing the light transmitter 3, the operator needs to carry the device to an installation position at a high place. When carrying the device, as shown in FIG. 12, as shown in FIG. The main body 13 is held on the upper portion of the base 15 by engaging the locking screw 33 (the enlarged portion surrounded by the right circle in FIG. 12 is shown at the tip of the arrow). That is, the main body locking screw 33 is inserted into the locking hole 31 of the main body 13 and used in the installed state, but is inserted into the dharma hole 45b below the main body 13 until the installation (until the start of the optical axis adjustment). Have been used. Further, the cover 17 hooks the hook shaft 63 of the cover 17 on the hook 51a of the base 15 (enlarged portion surrounded by the left circle in FIG. 12 is shown at the end of the arrow). By doing so, the light transmitter 3 can be held with one hand and can be carried very easily. Moreover, since the main body 13 and the cover 17 are locked to the base 15, the light transmitter 3 is integrated until the base 15 is attached to the wall, and the light transmitter 3 can be attached even if the construction tool is held in one hand. Since it can be held with the other hand, installation of the light transmitter 3 is facilitated. Furthermore, the following operations can be performed smoothly together with these.

At the installation position, the base 15 is fixed to a wall-side switch box or the like.
Next, as shown in FIG. 13, the wiring 111 from the wall side is pulled out from the wiring window 53 and connected to the connector portion 11 a of the instrument base 11. At this time, since the main body 13 does not block the wiring window 53 of the base 15, the wiring 111 from the wall side can be easily pulled out. Furthermore, since the main body 13 is located above the base 15, the operator can easily confirm the position of the connector portion 11a only by looking up from below, and the wiring work can be facilitated.

Next, the screwing of the main body locking screw 33 is loosened, the main body 13 is separated from the base 15, and the main body 13 is moved downward. At this time, the wiring 111 is guided by the guide surface 11b which is provided on the back side of the instrument table 11 and is inclined downward (inner side to front side) so that the wiring 111 is not loaded. It has become.
Next, after passing the head of the main body locking screw 33 through the rectangular portion 31a of the locking hole 31 of the main body 13, the main body 13 is lowered and the main body locking screw 33 is passed through the narrow portion 31b. Thus, the main body 13 is installed on the base 15 (see FIG. 14).
As described above, the main body locking screw 33 has both a role of temporarily holding the main body 13 on the upper portion of the base 15 and a role of fixing the main body 13 to the base 15.

<Optical axis adjustment method>
The optical axis adjustment is performed after the above installation work. In the optical axis adjustment, after the optical axis L is roughly adjusted (coarse adjustment), fine adjustment is performed while confirming whether a predetermined output is obtained. Hereinafter, rough adjustment and fine adjustment will be described in detail.
≪Coarse adjustment≫
The coarse adjustment is performed by turning the horizontal angle adjusting male screw 89 and the vertical angle adjusting male screw 77 while confirming the position of the opposing device using the collimation hole 99a, the viewing hole 101a, and the reflecting mirror 100, and the optical bench 23. Adjust the horizontal and vertical angles.
As described above, the collimation hole 99a is visible when the reflector 100 is viewed from the peephole 101a, and when the collimation hole 99a is viewed from the peephole 101a, an opposing device is present in the collimation hole 99a. The angle of the optical bench 23 is adjusted so that it can be seen.

FIG. 15 illustrates the position of the collimating hole 99a viewed from the peeping hole 101a and the opposing device (the light receiver 5 is shown as an example in FIG. 15) that can be seen in the collimating hole 99a.
First, the horizontal angle adjusting male screw 89 and the vertical angle adjusting male screw 77 are turned while looking through the peeping hole 101a so that the opposing device enters the field of view through the reflecting mirror 100 and the collimating hole 99a (FIG. 15). (See (a)).
Next, further adjustment is performed so that the opposing device is positioned at the center of the collimation hole 99a as shown in FIG. As described above, since the position of the collimation hole 99a coincides with the horizontal direction of the optical axis L, the horizontal angle of the optical axis L can be made substantially coincident with this. Therefore, in the next fine adjustment, which is the next work, the work can be reduced by adjusting mainly the vertical angle.

In the present embodiment, as described above, the head as the operating portion of the vertical angle adjusting male screw 77, the head as the operating portion of the horizontal angle adjusting male screw 89, and the peeping hole 101a, It is arranged on the same surface side (right side of the optical bench 23) with respect to the optical bench 23. Therefore, the operator is excellent in the operability of checking the position of the opposing device by looking through the peep hole 101a and adjusting the optical axis by rotating the screw head. For example, in general, when operating the vertical angle adjusting male screw 77 and the horizontal angle adjusting male screw 89, look at the cross hole in the screw head and turn each screw by 90 degrees to set the horizontal angle and vertical angle. Although it may be adjusted, it is easy to work in such a case.
The arrangement of the vertical angle adjusting male screw 77 and the horizontal angle adjusting male screw 89 is not limited to the above, and the head of the vertical angle adjusting male screw 77 and the head of the horizontal angle adjusting male screw 89 are the same. It suffices if it is on a surface other than the front and back sides of the arrangement optical bench 23, that is, on the outer peripheral surface.

≪Fine adjustment≫
In the fine adjustment, the horizontal angle and the vertical angle of the optical bench 23 are adjusted so as to obtain a predetermined output while confirming the received light output level using a voltmeter (not shown).
At this time, when the operation unit is on the front surface as in the prior art, the hand blocks the optical axis L during the operation, and thus the adjustment while confirming the accurate output level cannot be performed. Therefore, the adjustment is performed by repeating the procedure of operating the operation unit and then checking the output level.
In that respect, the light transmitter 3 of the present embodiment has the head of the horizontal angle adjusting male screw 89 as the operation unit on the right side and the head of the vertical angle adjusting male screw 77 on the upper side as described above. Therefore, the operator is positioned on the right side of the light transmitter 3 or the light receiver 5 and is operated from the right side or / and the upper side of the optical bench 23 to block the optical axis L during operation of the operation unit. There is nothing. Therefore, the output level can be confirmed while adjusting the operation unit, and the workability is very good.
Finally, the cover 17 pivotally supported below the base 15 is fixed from the front of the main body 13, and the optical axis adjustment is completed.

  As described above, in the present embodiment, the horizontal angle adjusting means 25 that adjusts the horizontal rotation angle of the optical axis L of the optical bench 23 and the vertical that adjusts the vertical rotation angle of the optical axis L. The angle adjusting means 27 is provided, and the operation parts of the horizontal angle adjusting means 25 and the vertical angle adjusting means 27 are arranged on the side surface and the top surface, so that the optical axis L is not touched during operation of these operation parts. Thus, fine adjustment of the optical axis adjustment can be performed efficiently.

  In addition, although the position of the peephole 101a was made into the right side, in this invention, the position of the peephole 101a is not limited to this. For example, as shown in FIG. 16 and FIG. In this case, the reflecting mirror 100 is installed to be inclined to the left side. When the peep hole 101a is on the left side in this way, the peep hole 101a is provided so as to face the head of the vertical angle adjusting male screw 77 and the head of the horizontal angle adjusting male screw 89. It will be. Therefore, when the optical axis is adjusted for such a thing, the operator is positioned on the left side of the main body 13, turns the hand around the optical axis L, and the head and the horizontal angle of the male screw 77 for vertical angle adjustment. By operating the head of the adjustment male screw 89, the horizontal angle and the vertical angle can be adjusted without looking at the optical axis L while looking through the viewing hole 101a.

  As described above, the collimation hole 99a is provided in a vertical plane in the depth direction of the optical bench 23 that passes through the light emitting element 21, so that the accuracy of adjustment in the horizontal angle direction is particularly high during rough adjustment. The position of the collimation hole 99a is not limited to this position, and the collimation hole 99a may be provided in a horizontal plane passing through the light emitting element 21 on the optical bench 23. In this case, the accuracy in the vertical angle direction can be increased. Further, a total of two collimation holes 99a may be provided on the optical bench 23, one in the horizontal plane passing through the light emitting element 23 and one in the vertical plane in the depth direction passing through the light emitting element 21. In this case, since the collimation hole 99a, the reflecting mirror 100, and the viewing hole 101a are a set, two sets are required.

  Further, although the temporary installation portion 45 is provided with the dharma hole 45b, for example, as shown in FIGS. 16 and 17, a slit 45c having a predetermined length from the lower end of the temporary installation portion 45 may be used. In this case, the main body 13 is lowered from above the base 15 and installed so that the slit 45c is inserted into the gap.

FIG. 11 shows an example in which the horizontal angle adjusting male screw 89 is always perpendicular to the support portion 43 of the main body 13. However, depending on the play setting of the insertion hole 43a, the horizontal angle adjusting male screw is shown. The horizontal angle restricting member 105 is pushed by the standing portion 87 with the screw feed of 89, and the horizontal angle restricting member 105 and the standing portion 87 are always in contact with each other (see FIGS. 18A and 18B). The direction of the horizontal angle adjusting male screw 89 may change.
Therefore, as shown in FIGS. 19 and 20, a posture holding portion 88 that stands up so as to face the standing portion 87 of the optical bench support frame 19 may be provided. The posture holding portion 88 is provided near the center of the optical bench support frame 19 with respect to the standing portion 87, and the distance between the posture holding portion 88 and the head of the horizontal angle adjusting male screw 89 is the same as that of the standing portion 87. The distance from the head of the horizontal angle adjusting male screw 89 is longer. That is, the posture holding portion 88 is located on the end side of the horizontal angle adjusting male screw 89. The posture holding portion 88 is provided with an insertion hole 88a in the center, and a horizontal angle adjusting male screw 89 is inserted therethrough. Here, the insertion hole 88a of the posture holding portion 88 is a horizontally long hole, and the horizontal diameter of the insertion hole 88a is shorter than the horizontal diameter of the horizontally long insertion hole 87a of the upright portion 87. Has been. By doing so, as shown in FIG. 21, the horizontal angle adjusting male screw 89 comes into contact with the wall surface forming the insertion hole 88a, and the orientation (posture) of the horizontal angle adjusting male screw 89 is held substantially constant. be able to. If the direction of the horizontal angle adjusting male screw 89 is substantially constant, it is not necessary to change the direction of the driver in order to turn the horizontal angle adjusting male screw 89, and the operability is good.

Further, a flat washer 112 as a smooth member may be disposed between the standing portion 87 and the horizontal angle regulating member 105 so that the standing portion 87 and the horizontal angle regulating member 105 (the convex portion 105a) are in contact with each other indirectly. . By doing in this way, the relative movement with respect to the standing part 87 of the horizontal angle regulation member 105 can be made smoother.
Further, when the flat washer 112 is arranged in this way, the urging force of the horizontal angle adjusting spring 35 is applied to the convex portion 105 a of the horizontal angle regulating member 105. By doing so, the position where the urging force is applied is closer to the axial center than when the urging force is applied to the longitudinal direction end of the horizontal angle regulating member 105 (in the case of FIG. 18). The bending moment acting on the angle adjusting male screw 89 can be reduced. Therefore, a biased force does not act on the screwing of the horizontal angle adjusting male screw 89 and the horizontal angle adjusting female screw of the horizontal angle regulating member 105, and the movement is not stiff when the screw is fed, and it can always be smooth. .

DESCRIPTION OF SYMBOLS L Optical axis S Gap 1 Photoelectric separation type detector 3 Light transmitter 5 Light receiver 7 L-shaped member 7a Elevation part 7b Horizontal surface part 9 Substrate 11 Base 11a Connector part 11b Guide surface 13 Main body 15 Base 17 Cover 19 Optical stand Support frame 19a Vertical side portion 19b Bottom side portion 21 Light emitting element 22 Light receiving element 23 Optical bench 25 Horizontal angle adjusting means 27 Vertical angle adjusting means 31 Locking hole 31a Rectangular portion 31b Narrow part 33 Body locking screw 35 For horizontal angle adjustment Spring 37 Fixed shaft 39 Support shaft 39a Screw hole 41 Flat washer 43 Support part 45 Temporary installation part 45a Reinforcement plate 45b Dalma hole 45c Slit 51 Overhang part 51a Hook 53 Wiring window 55 Dalma hole 57 Screw hole 61 Notch part 63 Pulling shaft 71 Shaft hole 73 Vertical angle adjusting spring 75 Spring support 75a Vertical angle adjusting female screw 77 Vertical angle adjustment Adjusting male screw 79 Horizontal reaction force receiving portion 79a Horizontal long hole 81 Rotating hole 83 Press washer 85 Screw 87 Standing portion 87a Horizontal long insertion hole 88 Posture holding portion 88a Insertion hole 89 Horizontal angle adjusting male screw 91 Lens 93 Substrate 95 Projection 97 screw 99 collimation piece 99a collimation hole 100 reflecting mirror 101 peek piece 101a peep hole 103 vertical direction reaction force receiving portion 103a insertion hole 105 horizontal angle regulating member 105a convex portion 105b female screw 111 for horizontal angle adjustment wiring 112 flat washer

Claims (2)

In a photoelectric separation type sensor comprising a light transmitter having an optical bench in which a light emitting element is accommodated and a light receiver having an optical bench in which a light receiving element is accommodated in a monitoring space,
An optical bench support frame that holds the optical bench and is installed on the instrument stand so as to be rotatable around a shaft portion;
Horizontal angle adjusting means for adjusting the horizontal optical axis of the optical bench by rotating the optical bench support frame in the horizontal direction;
The horizontal angle adjusting means includes a horizontal angle adjusting spring that applies horizontal rotational force to the optical bench support frame and presses the optical bench support frame so as to tilt forward. Photoelectric separation type sensor.   2. The photoelectric separation type sensor according to claim 1, wherein the optical table support frame is placed on a flat washer installed on the table.

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