JPH0314645Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting the optical axes of the light emitting part and the light receiving part of a point detector in the correct direction with respect to the mounting base member of the point detector.

FIG. 1 is a perspective view showing an example of a point detector. To use this point detector, the point detector main body 1 is attached to a running body (for example, a rail car), and the reflector plate 2 is installed in advance on the running path (for example, near the rail).

The above point detector main body 1 includes a light receiving section 3 and a light projecting section 4.
The mounting position of each of the projecting and receiving parts relative to the mounting base member 5 can be adjusted.

When the traveling body on which the point detector main body 1 is installed passes the installation point of the reflector plate 2, the light arrow a emitted from the light projector 4 is reflected by the reflector plate 2 and reaches the light receiver 3 as shown by the arrow b. Since the light is incident, it can be detected by the light detection signal from the light receiving section 3 that the light has passed through a predetermined point.

As is clear from the above-mentioned structural function, the light projecting section 4
The optical axis of the light receiving section 3 and the optical axis of the light receiving section 3 must be symmetrical with respect to the radio H placed at the reflection point R of the reflecting plate 2, respectively. For this reason, the light emitting and light receiving sections 4 and 3
Optical axis adjustment is performed. Specifically, the reflector 2 is set at a reference distance L (for example, 350 mm) from the point detector body 1.
Adjust so that when separated and facing directly, the optical axis of the light emitter 4 and the optical axis of the light receiver 3 intersect at point R on the reflector, and the intersection angle θ becomes a predetermined value (for example, 3 degrees). be done.

Conventionally, this adjustment is generally performed by directly facing the point detector main body 1a to be adjusted and a reference device 6 that has been accurately adjusted in advance, as shown in FIG. shall be.

The above-mentioned reference device 6 has a structure opposite to that of the point detector 1, and the installation positions of the light receiving section 3 and the light projecting section 4 are switched.

The center line XX of the point detector main body 1a and the center line XX of the reference device 6 are aligned, and the light receiving section 3 of the point detector main body 1a to be adjusted has maximum sensitivity. Adjust the optical axis of step 3. On the other hand, the optical axis of the light projecting section 4 of the point detector main body 1a is adjusted so that the light receiving section 3 of the reference device 6 has maximum sensitivity.

According to the conventional optical axis adjustment method as explained above, one standard device can only adjust the optical axis of one point detector body, and if multiple standards are not used, many points can be detected at once. It was not possible to adjust the main body of the device. Furthermore, the above-mentioned reference device was expensive because it had to include both the light receiving section 3 and the light projecting section 4. Moreover, the accuracy of the adjustment was low for the following reasons.

If there is an error in the angle of incidence of the projected light on the reflector,
An error also occurs in the reflection angle, and the total error appears as an angle twice as large as the adjustment error. This doubling of the optical axis error is an unavoidable characteristic of equipment that utilizes reflection. However, when the two opposing pairs of projecting and receiving sections 4 and 3 are adjusted independently of each other as described with reference to FIG. 2, the double angle error described above is added. In this addition of errors, + and - errors may be canceled out by chance, but there are also cases where +, +, or -, - are added by chance. Therefore, in the worst case, an error of four times the angle appears.

This idea was created in view of the above circumstances.
Using a standard with a simple configuration, it is possible to simultaneously adjust multiple point detector bodies per standard, and in addition, there is no possibility that the optical axis adjustment error will be double angle or more (excluding double angle). It is an object of the present invention to provide a jig for adjusting an optical axis without distortion.

In order to achieve the above purpose, the optical axis adjustment jig of the present invention has two point detector bodies set at a reference distance L.
A surface plate member configured to be mounted directly facing each other with an interval of 2L, and a common center of the two point detector bodies attached to the surface plate member. It comprises a mirror detachably attached perpendicular to the line, and a reference unit configured to be attached in exchange for at least one of the two point detectors. The reference unit described above is a component similar to the reference device 6 (FIG. 2) in the prior art, but it is sufficient to include either the light receiving section 3 or the light projecting section 4.

Next, one embodiment of the present invention will be described with reference to FIG.

Reference numeral 7 denotes a frame configured as a surface plate member, and is provided with mounting plates 7a and 7b for mounting two point detector bodies so as to face each other.

5', 5' indicated by imaginary lines are the mounting plates 7 mentioned above.
When the point detector body is installed on a and 7b,
The position of the mounting base member 5 of the point detector main body is shown, and the interval is set to be 2L.

This frame 7 is constructed symmetrically with respect to two orthogonal axes X'-X' and Y-Y, and when the point detector main body 1 is attached, its center line X-X coincides with the frame's axis of symmetry X'-X'. Configure it as follows.

A mirror support 9 is fixed to the frame 7 so as to detachably support the double-sided mirror 8 along the axis of symmetry YY and perpendicular to the axis X'-X'. When carrying out the present invention, the method of supporting the double-sided mirror 8 does not necessarily have to be removable, but may be configured to rotate, for example. In the present invention, the term "removably attaching the mirror" means supporting the mirror so that it can be easily changed to a predetermined position and posture and easily restored.

Reference numeral 10 denotes a reference unit used for adjustment, which includes a mounting base member 5 similar to the constituent members of the point detector main body 1.
A light projecting section 4, which is similar to the component of the point detector main body 1, is mounted on top, and its optical axis is adjusted accurately and fixed. That is, this reference unit 1
0 indicates the distance from the conventional reference device 6 to the light receiving section 3 shown in FIG.
This is a configuration that removes the .

The four point detector bodies shown in Figure 3 are as follows:
For convenience of explanation, the order in which adjustments are planned is 1.
They are distinguished by adding symbols a, 1b, 1c, and 1d.

4 to 6 are perspective views for explaining the procedure for adjusting the optical axes of the point detector bodies 1a, 1b using the above-mentioned optical axis adjustment jig.

As shown in FIG. 4, the reference unit 10 is attached to the attachment plate 7b of the frame 7, and the point detector main body 1a to be adjusted is attached to the attachment plate 7a.

While projecting light from the light projecting section 4 of the reference unit 10, the optical axis of the light receiving section 3 of the point detector 1a is adjusted.
This adjustment can be carried out by searching for a posture of the light receiving section 3 in which the detection output signal of a photo sensor (not shown) provided inside the light receiving section 3 has a maximum value, and fixing that posture.

Next, as shown in FIG. 5, the reference unit 10 is removed and the double-sided mirror 8 is attached to the mirror support 9. Since the light receiving section 3 of the point detector main body 1a has been adjusted as described above, the posture of the light emitting section 4 is found and fixed so that the photo sensor (not shown) of this light receiving section 3 has the maximum output. .
This completes the projection of the point detector main body 1a and the optical axis adjustment of the light receiving section.

As shown in FIG. 6, while the adjusted point detector body 1a is still attached to the mounting plate 7a, the point detector body 1 to be adjusted next time is attached to the mounting plate 7b.
b, and at the same time remove the double-sided mirror 8.

Light is projected from the light projecting section 4 of the adjusted point detector main body 1a, and the light receiving section 3 of the adjusted point detector main body 1b is set so that the detection output of the light receiving section 3 of the adjusted point detector main body 1b is maximized.
Adjust the optical axis.

After adjusting the optical axis of the light receiving section 3 of the point detector main body 1b, attach the double-sided mirror 8 to the mirror support 9, and adjust the optical axis of the light emitting section 4 of the point detector main body 1b according to the procedure explained in FIG. Adjust.

Next, the double-sided mirror 8 and the adjusted point detector main body 1a are removed, and the next adjusted point detector main body 1c is attached to the mounting plate 7a.

Hereafter, repeat the same procedure to install the point detector body 1.
Adjust the optical axes of c, 1d....

As is clear from the optical axis adjustment procedure explained above, in this embodiment, the reference unit 10 is required only when adjusting the optical axis of the first light receiving unit (Fig. 4); is reference unit 10
multiple point detector bodies 1b, 1c without using
The optical axes of ... can be adjusted sequentially.

Therefore, one reference unit 10 and n frames 7
(n is an integer of 2 or more), n series of optical axis adjustments can be performed in parallel. Moreover, since the reference unit 10 of this embodiment does not require the light receiving section 3, it is less expensive than the conventional reference device 6 (FIG. 2).

As a different embodiment from the above, it is also possible to construct a reference unit (not shown) in which only a light receiving section is provided without providing a light projecting section, and to perform optical axis adjustment in the same manner as described above.

In the above adjustment procedure, as explained with reference to FIG.
The final adjustment of the projection and light-receiving sections in a is performed by adjusting the optical axis of the light-emitting section using the light emitted from the light-emitting section of the point detector main body, without relying on the projection and light-receiving sections of other devices.
Therefore, the adjustment error only appears as a double angle at the maximum, and does not increase beyond that.

As detailed above, according to the present invention, it is possible to simultaneously adjust the optical axes of a plurality of point detector bodies per reference unit using a reference unit with a simple configuration. The optical axis adjustment error is limited to a maximum of twice the angle, and there is no possibility of it becoming larger.

[Brief explanation of the drawing]

Fig. 1 is a perspective view for explaining the function of the point detector, Fig. 2 is an explanatory diagram of a conventional method for adjusting the optical axis of a point detector, and Fig. 3 is an implementation of the optical axis adjustment jig of the present invention. FIGS. 4 to 6 are perspective views for explaining the procedure for using the above-mentioned embodiment. 1... Point detector main body, 1a, 1b, 1c, 1
d...The point detector body where the optical axis should be adjusted, 2...
Reflector plate, 3... Light receiving section, 4... Light emitting section, 5... Mounting base member, 6... Conventionally used reference device, 7... Frame as surface plate member, 7a, 7b...
Mounting plate, 8...Double-sided mirror, 9...Mirror support, 10...Reference unit as a reference device of the present invention.

Claims (1)

[Scope of utility model registration request] In a jig for adjusting the optical axis of a point detector equipped with a light emitting part and a light receiving part, a surface plate member configured to mount two point detectors facing each other at an interval twice the reference distance. and a mirror removably attached perpendicular to the common center line of the two point detectors at the center of the two point detectors attached to the above-mentioned surface plate member; and a reference unit configured to be able to be attached by replacing at least one of the above, and the reference unit has either one of a light emitting part and a light receiving part for a point detector. Optical axis adjustment jig for point detector.