JPH0935595A - Optical axis adjusting jig, multi-optical axis photoelectric sensor and optical axis adjusting method thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] To make it easy to adjust the optical axis in a multi-optical axis photoelectric sensor. [Structure] An optical axis adjusting light projecting portion 15 and a target mark 18 are provided on both sides of a light projector 11 of a multi-optical axis photoelectric sensor. Further, the light receiver 12 is provided with a target mark 16 for receiving the light from the adjusting light projecting portion 15 and an adjusting light projecting portion 17 for making the light incident on the light projector 11. Adjusting light projecting section 15,
The optical axes of 17 are set to be parallel to the optical axes of the light projector 11 and the light receiver 12, respectively. By adjusting the light of the adjusting light projecting portion so that it is incident on the predetermined position of the target mark, the optical axes of the light projector 11 and the light receiver 12 can be adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-optical axis photoelectric sensor having a plurality of optical axes, an optical axis adjusting jig, and an optical axis adjusting method for the multi-optical axis photoelectric sensor.

[0002]

2. Description of the Related Art A conventional multi-optical axis photoelectric sensor has a plurality of light emitting elements such as L1 to L5 and a light receiving element P as shown in FIG.
1 to P5 are arranged so that their optical axes are parallel to each other. The drive circuit 2 drives the light projecting elements L1 to L5 via the light projecting control circuit 1. The light receiving control circuit 3 controls so that only the inputs from the corresponding light receiving elements P1 to P5 are valid at the timing of driving the light projecting elements L1 to L5. Then, the output of the light receiving control circuit 3 is amplified by the amplification circuit 4 and given to the determination circuit 5. It is assumed that the determination circuit 5 does not block light between the light emitting and receiving elements when the output of a predetermined level or more is continuously obtained from the sequential amplifying circuit 4, and the light is blocked if the output level from any one of the light receiving elements decreases. It is determined to be present. The output of the determination circuit 5 is output as a detection signal via the output circuit 6. In this way, a detection signal is output when an object or the like blocks one of the optical axes.

Therefore, in the multi-optical axis photoelectric sensor, it is necessary to align the optical axes so that the projected light can be received by the light receiving element which is paired with each light projecting element. In the conventional multi-optical axis photoelectric sensor, when adjusting the optical axis, it is detected whether or not each light-receiving element has a certain level of incident light in all the optical axes,
The light axis was adjusted by turning on the stable light-entering indicator light when there was light incident above a certain level.

[0004]

However, in such a conventional optical axis adjusting method for a multi-optical axis photoelectric sensor, it is not possible to detect a slight deviation of the optical axis, and it is not possible to improve the adjusting accuracy of the optical axis. It was extremely difficult and time-consuming.

The present invention has been made in view of the above conventional problems, and an object thereof is to make it possible to easily adjust the optical axis of a multi-optical axis photoelectric sensor.

[0006]

The invention according to claim 1 of the present application has a plurality of light projecting elements having optical axes parallel to each other.
A light projector that irradiates light in the same direction, a light receiver having a plurality of light receiving elements that receive light incident from a plurality of optical axes parallel to each other of the light projector, and a plurality of optical axes based on the output of the light receiver. In a multi-optical axis photoelectric sensor having a signal processing unit that detects an object that shields any of the light, the light projector is disposed at one end of the light sensor, and light is emitted in an optical axis direction parallel to the optical axis of each light projecting element of the light projector. And a second adjusting light receiving portion which is arranged at the other end and which indicates the position of light incident from a direction parallel to the optical axis of each of the light emitting portions. The light receiver is arranged at one end thereof, and is arranged at a first adjustment light receiving portion indicating the position of light incident from the first adjustment light emitting portion of the light projector, and at the other end, The optical axis direction is parallel to the optical axis of each light receiving element, Second adjustment light projecting unit for irradiating light to the position corresponding to the adjustment light receiving unit, a multi-optical axis photoelectric sensor characterized by having a.

The invention of claim 2 of the present application has a plurality of light projecting elements having optical axes parallel to each other, and a light projector for irradiating light in the same direction and incidence from a plurality of optical axes parallel to each other of the light projector. In a multi-optical axis photoelectric sensor having a light receiver having a plurality of light receiving elements for receiving light, and a signal processing unit that detects an object that shields one of a plurality of optical axes based on the output of the light receiver, The light emitter and the light receiver each have a level disposed on the upper surface of the fixed position, and the light receiver and the light emitter emit light in an optical axis direction parallel to the optical axes of the light emitter and the light receiver. First and second adjusting light emitting parts for irradiating, and first and second adjusting light receiving parts showing the position of light incident from a direction parallel to the optical axis of each light receiving element of the light emitter and the light receiver. A multi-optical axis light having two of each It is a sensor.

According to the invention of claim 3 of the present application, the multi-optical axis photoelectric sensor is detachably attached to either one of the light emitter and the light receiver, and the light is emitted in a direction parallel to the optical axis of each light emitting element or each light receiving element. The adjusting light receiving jig for irradiating light and the adjusting light receiving jig that is detachably attached to the other of the light emitting device or the light receiving device and receives light from a direction parallel to the optical axis of each light emitting element or each light receiving element. A jig for adjusting an optical axis, which comprises:

According to a fourth aspect of the present invention, the multi-optical axis photoelectric sensor is detachably attached to one of a light emitter and a light receiver.
A leveling device disposed on the upper surface thereof, and an adjusting light projecting jig having first and second adjusting light projecting portions for irradiating light in an optical axis direction parallel to the optical axis of the light projecting device or the light receiving device, A level level detachably attached to the other of the projector or the light receiver, and a level provided on the upper surface thereof, and an optical axis direction parallel to the optical axis of the projector or the light receiver, An adjusting light-receiving jig having first and second adjusting light-receiving parts for respectively receiving lights corresponding to the first and second adjusting light-projecting parts. It is a jig.

According to a fifth aspect of the present invention, the multi-optical axis photoelectric sensor is detachably attached to one of a light emitter and a light receiver.
A level provided on the upper surface thereof, a first adjusting light projecting section for irradiating light in an optical axis direction parallel to the optical axis of the light emitter or the light receiver, and a direction parallel to the optical axis of the light emitter or the light receiver. A first adjusting light emitting / receiving jig having a second adjusting light receiving part for receiving light from the light source, and a level level detachably attached to the light emitting device or the other of the light receiving devices and arranged on the upper surface thereof, And a first adjustment unit for receiving light from a first adjustment projection unit of the first adjustment projection / reception jig in an optical axis direction parallel to an optical axis of the projector or the receiver. A second adjusting and projecting and receiving jig having a light receiving section and a second adjusting and projecting section that emits light in an optical axis direction parallel to the optical axis of the projector or the light receiver;
A jig for adjusting an optical axis, comprising:

The invention according to claim 6 of the present application is the optical axis adjusting method for a multi-optical axis photoelectric sensor according to claim 1, wherein the light emitted from the first adjusting light projecting portion of the light projector is received by the light receiving portion. First of
Incident on a predetermined position of the adjusting light receiving part of the
The optical axis adjustment is performed by defining the positions of the light projector and the light receiver so that the light emitted from the light projector for adjustment enters the predetermined position of the second light receiver for adjustment of the light projector. It is a feature.

The invention of claim 7 of the present application is the optical axis adjusting method for a multi-optical axis photoelectric sensor according to claim 2, wherein the light projector and the light receiver are made horizontal by the level of the light projector and the light receiver. So that the light from the first adjusting light projecting portion of the projector or the light receiver is incident on a predetermined position of the first adjusting light receiving portion, and the second light of the projector or the light receiver is received. The optical axis adjustment is performed by defining the positions of the light projector and the light receiver so that the light of the adjustment light projector is incident on the predetermined position of the second adjustment light receiver. is there.

[0013]

1 is a perspective view showing an embodiment of a multi-optical axis photoelectric sensor of the present invention. In this figure, the multi-optical axis photoelectric sensor is composed of a rectangular parallelepiped projector 11, a light receiver 12, and a signal processing unit 13 connected thereto.
The light projector 1 has the above-described light projecting control circuit 1 and drive circuit 2, and a plurality of light projecting elements, for example, L1 to L5 as shown, and emits light at a plurality of optical axes parallel to the direction of the light receiver 12. To do. The light receiver 12 is composed of a plurality of light receiving elements P1 to P.
5. The light receiving control circuit 3 is provided to receive the light emitted along the respective optical axes of the respective light projecting elements.
The signal processing unit 13 is configured to include the above-described conventional amplification circuit 4, determination circuit 5, and output circuit 6.

Here, in order to exactly match the optical axes of the light projecting element and the light receiving element, it is necessary to make the light projecting device 11 and the light receiving device 12 parallel to each other and to arrange the light projecting and light receiving surfaces to face each other. is there. Therefore, in the present invention, one end of the light projector 1, for example, in the present embodiment, as shown in the drawing, on the upper projector 11 side,
The optical-axis adjusting light-projecting unit 15 is provided. This light projecting section 15
Is a light source with high straightness and visibility, for example, a laser light source of visible light, the optical axis of which is another light projecting element L of the projector 11.
It is assumed that they are arranged so as to be parallel to the optical axes of 1 to L5. Corresponding to this, the light receiver 12 is provided with a light projecting unit
A target mark 16 which is a first optical axis adjusting light receiving portion is provided on the optical axis of 5. The target mark 16 is composed of, for example, a cross and a circular mark indicating the center position as shown in the drawing, and the optical axes thereof coincide with each other when the laser light of the adjusting light projecting unit 15 is applied to the center thereof. To judge. The same second adjusting light projecting unit 17 is arranged below the light receiver 12 and irradiates the light projector 11 side with visible light which is parallel to the light receiving axes of the other light receiving elements and has high visibility. A light receiver 12 is provided at a position corresponding to this of the light projector 11.
A target mark 18, which is a second light receiving unit for adjusting the optical axis similar to the above, is provided. Here, by setting the optical axes of the first and second adjusting light projecting units 15 and 17 in parallel with the optical axes of the light projecting elements L1 to L5 and the light receiving elements P1 to P5, the adjusting light projecting units 15 and 17 are formed. If the light emitters / receivers 11 and 12 are adjusted so that the light of (1) irradiates the centers of the target marks 16 and 18, the upper and lower two adjusting optical axes coincide, and the other optical axes also coincide. In this way, the irradiation position of the visible light laser beam is confirmed, and the optical axis is accurately adjusted by adjusting the position and angle of the projector 11 or the light receiver 12 so that the light enters the center of the target mark. You can

FIG. 2 is a perspective view showing a second embodiment of the multi-optical axis photoelectric sensor of the present application. In this embodiment, the same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. In this embodiment, the light projector 21 and the light receiver 22 are provided with levelers 23 and 24 respectively on their upper surfaces. FIG. 3 shows the level 23 and 2.
6 is a diagram showing a display example of No. 4. FIG. The spirit level 23, 24 has a scale in the x-axis and y-axis directions. If the light projector 21 or the light receiver 22 is arranged so that the air bubbles are located at the center of this scale, the light projector 21 or the light receiver 22 is installed vertically. The present embodiment is an adjusting means effective for the actually frequently used use state in which the light projector 21 and the light receiver 22 are vertically arranged. Also, the projector 21 and the receiver 2
When 2 and 2 are arranged horizontally in the vertical direction, a level 25 can be arranged in the center of the projector 21 and a level 26 can be arranged on the lower surface of the light receiver 22 for adjustment as shown in the figure.

In this embodiment, the projector 21 and the light receiver 22 are provided.
The optical axes for adjustment are provided above and below, but on one side,
For example, it is conceivable to provide two adjusting optical axes at the upper ends of the light projector 21A and the light receiver 22A as shown in the third embodiment in FIG. In this case, the projector 21A,
It is preferable to arrange two optical axes for adjustment in a plane perpendicular to the longitudinal direction of the light receiver 22A. In order to set such an optical axis, the light-projecting units 15 and 17 for adjusting the optical axis are provided, for example, in the projector
1A side, and the target mark 1 on the light receiver 22A side.
It is necessary to arrange 6 and 18 adjacently. The optical axes of the adjusting light projecting units 15 and 17 are arranged in a direction parallel to the optical axis of the projector 21A, and the positional relationship between the optical axis and the adjusting optical axis is determined by the light receiving light of the light receiver 22A. Axis and receiver 22
It is necessary to match the positional relationship with the A target marks 16 and 18.

Further, as shown in FIG. 5A, the fourth embodiment,
The target marks 16 and 18 are arranged on the projector 21B,
The light projecting portions 15 and 17 for adjusting the optical axis may be arranged in the light receiver 22B. Further, as shown in FIG. 5B, the fifth embodiment,
The light projector 21C is provided with a light projecting portion 15 and a target mark 18 for adjusting the optical axis, the light receiver 22C is provided with a target mark 16 at a position corresponding to the optical axis of the light projecting portion 15 for adjustment, and the target mark 18 of the light projector 21C is provided. It is also possible to provide an adjusting light-projecting unit 17 for irradiating light to the above.

Next, a first embodiment of the adjusting jig of the present application will be described. FIG. 6A shows an adjusting light-projecting jig 31 attached to, for example, one end of either the light-emitter or the light-receiver, and FIG. 6B shows an adjusting light-projection jig 31 attached to the corresponding position of the other of the light-emitter and the light-receiver. The light receiving jig 32. Each of these jigs 31 and 32 has a substantially rectangular parallelepiped shape and has a U-shaped cutout, and leg portions 33a and 33 having inwardly facing claws are provided.
b and 34a, 34b are provided. Legs 33a, 33
b and 34a and 34b are a light projecting jig 31 and a light receiving jig 3, respectively.
2, a pressing portion 35a provided on the side wall of the second side wall 35b (not shown)
And pressing portion 36a shown in FIG. 4 (b), not shown 36b
By pressing, it rotates so as to spread outward. Then, the adjusting light projecting jig 31 is provided with the adjusting light projecting portion 37 as in the first embodiment described above. The adjusting light projecting unit 37 uses a light source with high straightness and high visibility, for example, a visible light laser light source, and irradiates light in the direction directly lateral to the adjusting light projecting jig 31. On the other hand, the adjustment light receiving jig 3
A target mark 38 similar to that of the first embodiment is provided on the side wall of No. 2 at a position corresponding to the projection axis of the adjusting projection jig 31, as shown in the figure.

FIG. 7 is a perspective view showing a state in which the adjusting jig is attached to the light projector 41 and the light receiver 43. Floodlight 4
1 is provided with a light projecting control circuit 1, a driving circuit 2 and a plurality of light projecting elements L1 to L5 as in the conventional example, but may have an adjusting light projecting section and a target mark as in the first embodiment. No
It is formed in a rectangular parallelepiped shape. Further, cuts 42a, 42b, 42c, 42d are provided at positions corresponding to the claws of the leg portions 33a, 33b, 34a, 34b above and below the rectangular parallelepiped. The light receiver 43 also has the light receiving elements P1 to P5 and the light receiving control circuit 3 as described above, and the light projecting jig 3
1. Cuts 44a to 44d are provided at vertically symmetrical positions where the light receiving jig 32 is attached. By providing such a notch, the pressing portions 35a, 35b, 36a, 36b of the adjusting jigs 31, 32 are pressed, so that the jigs 31, 32 are provided above and below the light emitter 41, the light receiver 43 as shown in the drawing. Can be installed. Further, the adjusting light receiving jig 32 is fixed to the lower end of the light projector 41, and the adjusting light emitting jig 31 is fixed to the light receiver 43.

When the adjusting light-projecting jig 31 of the projector 41 is driven, the adjusting jig 31 irradiates the adjusting laser beam in a direction parallel to the optical axes of the other light-projecting elements of the projector 41, and the light-receiver is received. It is incident on the target mark 38 of the adjustment light-receiving jig 32 attached to 43. Further, the laser beam of the light projecting jig 31 of the light receiver 43 is emitted parallel to the light receiving axis and enters the target mark 38 of the light receiving jig 32. Therefore, as in the first embodiment of the multi-optical axis photoelectric sensor, by adjusting the position of the light projector 41 or the light receiver 43 so that the laser light is incident on the center of the target mark, all of the light projector 41 and the light receiver 43 are adjusted. The optical axes become parallel and the optical axis can be adjusted. In this way, the optical axis of the light projecting jig 31 is fixed to the normal light projecting device and the light receiving device so as to be parallel to the optical axis of the light projecting and receiving light. If the light is made incident on the optical axis, the optical axis can be easily adjusted by mounting it on the conventional multi-optical axis photoelectric sensor.

FIG. 8 is a perspective view showing a second embodiment of the optical axis adjusting jig of the present invention. In this embodiment, the light projecting jig 51 has substantially the same structure as the light projecting jig 31, and the leg portions 33a,
33b, pressing portions 35a and 35b, and an adjusting light projecting portion 37 including a laser light source is provided. Then, on the upper surface thereof, a level 5 similar to that of the second embodiment of the multi-optical axis photoelectric sensor is provided.
2 is placed. The light receiving jig 53 is the light receiving jig 3 described above.
2 has almost the same configuration as that of the second embodiment and has leg portions 34a, 34
b, the pressing portions 36a and 36b are provided, and the target mark 38 is provided on the side surface. A level 54 similar to that of the second embodiment of the multi-optical axis photoelectric sensor is provided on the upper surface thereof. In this way, the optical axis can be adjusted by attaching the light projecting jig 51 and the light receiving jig 53 to the light projecting device 41 and the light receiving device 43, respectively, and moreover, the light projecting device and the light receiving device can be arranged vertically by using a level. Therefore, the optical axis can be easily adjusted.

FIG. 9 is a perspective view showing an adjusting light-receiving jig according to the third embodiment. In the light receiving jig 55 according to this embodiment, the level 54 is provided on the upper surface, and the light receiving element 56 for receiving light from a specific direction is provided in the housing. A display element 57 is provided for discriminating and displaying the light receiving level of the light receiving element 56 when the light receiving level exceeds a predetermined value. In this case, the laser light source of the light projecting portion of the corresponding light projecting jig may use light that is not visible light. For example, when infrared light is used, a light receiving element that can receive light of a wavelength corresponding to this 56 shall be used. When the light receiving level exceeds a certain level, the display element 57 is turned on. The display is not limited to the display by the display element, and it is sufficient if the light receiving element indicates that the light of the predetermined level is received, such as driving a buzzer when the light receiving level is equal to or higher than a predetermined value.

FIG. 10 is a perspective view showing a projecting / receiving jig which is an adjusting jig according to the fourth embodiment of the present invention. In this embodiment, the adjusting light projecting / receiving jig 58 has substantially the same structure as the light projecting jig 51. A light projecting portion 37 that emits light is provided in the lateral direction thereof, and a target mark 38 is provided at a position adjacent to the light projecting portion 37. Above that, like the light projecting jig 51, the level 5
2 is provided. Then, two of these light projecting / receiving jigs 58 are used as first and second adjusting light projecting / receiving jigs, and are fixed to, for example, the upper surfaces of the light projecting device 41 and the light receiving device 43 as shown in FIG. In this way, the optical axis can be adjusted using the pair of light emitting / receiving jigs.

As shown in FIG. 11A, the adjusting light-projecting jig 51A is provided with a pair of optical-axis adjusting light-projecting parts 37A and 37B, and the corresponding adjusting light-receiving jig 53A is shown in FIG.
As shown in (b), two target marks 38A, 3
8B may be provided and these may be attached to the projector 41 and the light receiver 43. Further, similarly to the third embodiment, the display can be turned on when a light receiving signal exceeding a predetermined level is obtained instead of the target mark.

FIG. 12 is a perspective view showing a light transmitter and a light receiver according to a sixth embodiment of the multi-optical axis photoelectric sensor of the present application. In this embodiment, the same parts as those in the second embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted. In this embodiment, the projector 61
In addition, the photodetector 62 is provided with adjusting photodetectors 63 and 64 instead of the target marks. The adjusting light receiving portions 63 and 64 have light receiving elements similarly to the third embodiment of the adjusting light receiving jig, and when the light incident from the adjusting light emitting portion exceeds a predetermined level, the indicator lamp on the upper surface thereof. 65 and 66 are turned on. Also in this case, it is not necessary to use visible light as the light source for adjusting the optical axis. By providing the adjustment light receiving unit in this manner, it is not necessary to check the target mark, and it is possible to check that the optical axes match by turning on the indicator lamp. Further, leveling devices 23 and 24 similar to those of the second embodiment may be provided on the upper surface thereof.
Further, the optical axis adjusting means including the light receiving adjusting unit and the level may be used as an adjusting jig so as to be detachably attached to an ordinary light emitting and receiving device.

In the adjusting light projecting jig and the adjusting light receiving jig having the indicator lamp of each of the above-mentioned embodiments, the power is supplied from the outside, but a battery is provided in the adjusting jig. These jigs can be attached to the light emitter / receiver without using a cord by driving the light source or the light receiver or the display device.

In each of the embodiments of the multi-optical axis adjusting sensor described above, the signal processing unit is provided in addition to the light emitter and the light receiver. However, the function of the signal processing unit is provided in either the light emitter or the light receiver. It goes without saying that the multi-optical axis photoelectric sensor can be incorporated to form a multi-optical axis photoelectric sensor.

[0028]

As described in detail above, according to the present invention, the optical axis adjustment of the multi-optical axis photoelectric sensor can be performed extremely easily and accurately. Therefore, erroneous detection due to the deviation of the optical axis, mutual interference, etc. are reduced, and the multi-optical axis photoelectric sensor can be easily used. Furthermore, the present invention is applied to a normal multi-optical axis photoelectric sensor by using this adjustment jig,
The optical axis can be adjusted accurately and extremely easily.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a first embodiment of a multi-optical axis photoelectric sensor of the present application.

FIG. 2 is a perspective view showing a configuration of a main part of a second embodiment of the multi-optical axis photoelectric sensor of the present application.

FIG. 3 is a front view showing a display state of a spirit level used in a second embodiment.

FIG. 4 is a perspective view showing the configuration of a third embodiment of the multi-optical axis photoelectric sensor of the present application.

5A is a perspective view showing a configuration of a multi-optical axis photoelectric sensor according to a fourth embodiment of the present application, and FIG. 5B is a perspective view showing a configuration of the fifth embodiment.

FIG. 6 is a perspective view showing a configuration of a first embodiment of an optical axis adjusting jig of the present application.

FIG. 7 is a perspective view showing a state in which the optical axis adjusting jig according to the present embodiment is attached to a light projector and a light receiver.

FIG. 8 is a perspective view showing a configuration of a second embodiment of the optical axis adjusting jig of the present application.

FIG. 9 is a perspective view showing the configuration of a third embodiment of the optical axis adjusting jig of the present application.

FIG. 10 is a perspective view showing a fourth embodiment of a light emitting / receiving jig which is an optical axis adjusting jig of the present application.

FIG. 11 is a perspective view showing an optical axis adjusting jig according to a fifth embodiment of the present application.

FIG. 12 is a perspective view showing the configuration of a sixth embodiment of the multi-optical axis photoelectric sensor of the present application.

FIG. 13 is a block diagram showing the overall configuration of a multi-optical axis photoelectric sensor.

[Explanation of symbols]

 11,21,21A to 21C, 41,61 Light projector 12,22,22A to 22C, 43,62 Light receiver L1 to L5 Light emitting element P1 to P5 Light receiving element 15,17,37 Adjusting light projecting section 16,18, 38 target mark 13 signal processing unit 23, 24, 52, 54 level 33, 51, 51A adjusting light projecting jig 32, 53, 53A, 55 adjusting light receiving jig 33a, 33b, 34a, 34b leg 35a, 35b , 36a, 36b Pressing parts 42a-42d, 44a-44d Notches 56 Light receiving elements 57 Display elements 58 Adjusting light emitting / receiving jigs 63, 64 Adjustment light receiving parts

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takayoshi Takahara, 10th Hanazono Todocho, Ukyo-ku, Kyoto, Kyoto Prefecture Omron Co., Ltd. Within the corporation

Claims (7)

[Claims] 1. A light projecting device having a plurality of light projecting elements having optical axes parallel to each other, and a plurality of light projecting devices for irradiating light in the same direction, and a plurality of light receiving devices for receiving light incident from a plurality of mutually parallel optical axes of the light projecting device. In a multi-optical axis photoelectric sensor having a light receiver having a light receiving element and a signal processing unit that detects an object that shields one of a plurality of optical axes based on the output of the light receiver, the light projector has one end thereof. A first adjusting light-projecting unit that is arranged and irradiates light in an optical axis direction parallel to the optical axis of each light-projecting element of the projector, and is arranged at the other end and is parallel to the optical axis of each of the light-projecting units. A second adjusting light-receiving unit that indicates the position of light incident from any direction, the light-receiving unit being disposed at one end of the second light-receiving unit, and the first light-receiving unit for the light-projecting unit.
A first adjusting light-receiving part that indicates the position of light incident from the adjusting light-projecting part, and an optical axis direction parallel to the optical axis of each light-receiving element, the first adjusting light-receiving part being located at the other end. 2. A multi-optical axis photoelectric sensor, comprising: a second adjusting light projecting unit that emits light to a position corresponding to the second adjusting light receiving unit. 2. A light projecting device having a plurality of light projecting elements having optical axes parallel to each other, and a plurality of light projecting devices for irradiating light in the same direction, and a plurality of light receiving devices for receiving light incident from a plurality of mutually parallel optical axes of the light projecting device. In a multi-optical axis photoelectric sensor having a light receiver having a light receiving element, and a signal processing unit that detects an object that shields one of a plurality of optical axes based on the output of the light receiver, the light projector and the light receiver are And a light level provided on the upper surface of the fixed position, wherein the light receiver and the light emitter irradiate light in an optical axis direction parallel to the optical axes of the light emitter and the light receiver. 2 of the first and second adjustment light-receiving portions, each of which indicates the position of light incident from a direction parallel to the optical axis of the light-receiving element of the projector and the light-receiving element.
A multi-optical axis photoelectric sensor characterized by having one. 3. An adjusting light projector which is detachably attached to either one of a light emitter and a light receiver of a multi-optical axis photoelectric sensor and irradiates light in a direction parallel to an optical axis of each light emitting element or each light receiving element. And an adjusting light-receiving jig that is detachably attached to the other of the light-emitter or the light-receiver and that receives light from a direction parallel to the optical axis of each light-emitter or light-receiver. A jig for adjusting the optical axis. 4. A level instrument, which is detachably attached to one of a light emitter and a light receiver of a multi-optical axis photoelectric sensor and is disposed on the upper surface thereof, and a light beam in an optical axis direction parallel to the optical axis of the light emitter or the light receiver. And an adjusting light projecting jig having first and second adjusting light projecting parts, a level level detachably attached to the other of the light projecting device or the light receiving device and provided on the upper surface thereof, and the light projecting device. Alternatively, the first and second adjustments are performed in the optical axis direction parallel to the optical axis of the light receiver, and receive light corresponding to the first and second adjustment light projecting portions of the adjustment light projecting jig, respectively. An optical axis adjusting jig, comprising: an adjusting light receiving jig having a light receiving portion for use in adjustment. 5. A level level removably attached to one of a light emitter and a light receiver of a multi-optical axis photoelectric sensor, and a light level in an optical axis direction parallel to an optical axis of the light emitter or the light receiver. A first adjusting light projecting / receiving jig having a first adjusting light projecting unit for irradiating the light and a second adjusting light receiving unit for receiving light from a direction parallel to the optical axis of the light projector or the light receiver; A level which is detachably attached to the other of the projector or the light receiver and is arranged on the upper surface thereof, and an optical axis direction parallel to the optical axis of the projector or the light receiver,
Of the first adjusting light emitting section of the adjusting light emitting and receiving jig, and irradiates light in the optical axis direction parallel to the optical axis of the light emitting apparatus or the light receiving apparatus. A second adjusting light emitting / receiving jig having a second adjusting light emitting section, and an optical axis adjusting jig. 6. The optical axis adjusting method for a multi-optical axis photoelectric sensor according to claim 1, wherein the light emitted from the first adjusting light projecting section of the light projector is received by the first adjusting light receiving section. The light emitter and the light receiver so that the light incident on the predetermined position of the light receiver and emitted from the second adjusting light emitter of the light receiver enters the predetermined position of the second adjusting light receiver of the light emitter. A method for adjusting an optical axis of a multi-optical axis photoelectric sensor, characterized in that the optical axis is adjusted by defining the position of. 7. The method for adjusting an optical axis of a multi-optical axis photoelectric sensor according to claim 2, wherein the light emitter and the light receiver are installed horizontally by a level of the light emitter and the light receiver, The light of the first adjusting light-projecting unit of the projector or the light receiver is incident on a predetermined position of the first adjusting light-receiving unit, and the light of the second adjusting light-projecting unit of the projector or the light receiver is received. The optical axis adjustment of the multi-optical axis photoelectric sensor is performed by defining the positions of the light projector and the light receiver so that light is incident on a predetermined position of the second adjustment light receiving unit. Method.