JPH0452646Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a non-contact relative angle detection device that detects minute relative angles between objects in a non-contact manner.

[Prior Art] Conventionally, detection of minute relative angles between objects has mostly been carried out by bringing the objects into contact with each other. There was one in which a large number of grooves were formed on the outer periphery and the angle was detected by counting the number of grooves optically or magnetically.

[Problems to be solved by the invention] In high-precision measuring instruments and other equipment, parts and units often have to be assembled at angles with high precision on the order of minutes or seconds. In such cases, a highly accurate relative angle is required.
There are many cases where objects are not in direct contact with each other.

However, in the conventional non-contact relative angle detection as described above, the detection accuracy is determined by the number of grooves, making it impossible to detect minute angles with high precision.

This invention eliminates such conventional drawbacks and
It is an object of the present invention to provide a non-contact type relative angle detection device capable of detecting minute relative angles between objects in a non-contact manner and with high accuracy.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the non-contact relative angle detection device according to the present invention selectively displays two straight lines in different directions one by one on the same plane. a projection optical system that projects one straight line displayed on the straight line display means as two parallel straight images onto the same projection plane through two optical paths; The present invention is characterized in that it has a linear distance detection means that is provided to intersect with the line and detects the distance between two intersections with the parallel line.

[Operation] The first straight line displayed on the straight line display means is projected as two parallel straight line images by the projection optical system, and the straight line distance detection means provided on the projection plane and the parallel line The distance between the two intersection points is detected by the distance detecting means.

Next, in the linear display means, a second
If a straight line is displayed, a second parallel line with a different direction from the above parallel line is projected, and the distance between the two intersections of this second parallel line and the distance detection means is the same as in the above case. detected.

By comparing the distances between the two intersection points in these two cases (taking the difference), it is possible to calculate the relative angle at which the distance detection means is placed with respect to the projection optical system.

[Example] FIG. 1 shows an example of the present invention. In the figure, 1
2 is a light source, and 2 is a linear display means that can selectively display two straight lines in different directions on the same plane. As this linear display means 2, for example, a known liquid crystal display panel can be used. FIG. 2 shows an example of this, in which the diffuser plate 3 is
Through the center, two straight lines 4A and 4B, oriented at 90 degrees from each other, are formed using a liquid crystal, and one of the straight lines can be selectively displayed by known electrical control. . 1st
5 in the figure is its control circuit. Note that the linear display means 2 is not limited to the liquid crystal type, and any type of type may be used, such as a type in which a display board displaying a single straight line is rotated by a motor drive. Further, the angle formed by the two straight lines 4A and 4B does not necessarily have to be 90 degrees, and does not have to pass through the center of the liquid crystal display board 2.

In FIG. 1, 6 is a projection optical system that projects the straight line displayed on the straight line display means 2, and is located on both sides of the projection lens group 6a, which is arranged facing the straight line display means 2 with its center aligned with the projection lens group 6a. and a pair of imaging lenses 6b arranged in parallel in a direction perpendicular to the optical axis. With this pair of imaging lenses 6b,
One straight line image of the straight line display means 2 is formed on the same plane as two parallel straight line images.

7 is the imaging surface of the imaging lens, that is, the projection lens 6
A linear distance detecting means is disposed on the projection plane so as to intersect the projected parallel line, and detects the distance between two points of intersection with the parallel line. As the distance detecting means 7, a so-called line sensor is used, for example, in which a large number of optical sensors that convert incident light into electrical signals and output them are arranged in a straight line. 8
processes the output signal from the line sensor and
Known processing circuit for calculating distance between two intersection points, 9
is a display means that displays the distance between two intersection points using an output signal from the processing circuit.

In FIG. 1, 10 is an object to be examined, on which the distance detecting means 7 is placed, the linear display means 2 and the projection optical system 6 are housed in a frame 11 above it, and the object to be examined is It is arranged at a distance from the object 10.

Next, the operation of the above embodiment will be explained with reference to FIGS. 3 to 6. 4a and 4 in the diagram
b is a projected image of the two straight lines 4A and 4B on the straight line display means 2 projected by the projection optical system 6;
Parallel lines 4a, 4a created by projecting the straight line 4A of
will be referred to as a first parallel line, and parallel lines 4b, 4b generated by projecting the second straight line 4B will be referred to as a second parallel line.

(1) When the arrangement direction of the pair of imaging lenses 6b in the projection optical system and the direction of the line sensor, which is the distance detection means 7, completely match.

At this time, the distance L1 between the intersection of the distance detection means 7 and the first parallel lines 4a, 4a shown in FIG. 3, and the distance L1 between the intersection of the distance detection means 7 and the second parallel lines 4b, 4b shown in FIG. Distance L2 between the intersection with
and are equidistant (L1=L2).

(2) Arrangement direction of imaging lens 6b and distance detection means 7
When the direction of the line sensor does not match.

At this time, as shown in FIGS. 5 and 6, a difference occurs between L1 and L2. In FIGS. 5 and 6, the arrangement direction of the imaging lenses 6b is the horizontal direction. In this figure, L1＞
L2, and when the direction of rotation of the distance detection means 7 is reversed, L1<L2.

The distances L1 and L2 between these two intersection points are detected by the distance detection means 7, and the values thereof are displayed on the display means 9. Then, from the angle formed by the two straight lines 4A and 4B and L1-L2, etc., it is possible to calculate with high precision the angle formed between the direction of the distance detection means 7 on the object 10 and the arrangement direction of the imaging lens 6b. can.
Further, the calculation may be performed by the processing circuit 8 and the calculation result may be displayed on the display means 9.

[Effects of the invention] According to the non-contact relative angle detection device of the invention,
2 of the projected parallel line and the linear distance detection means
By detecting the distance between the intersection points, the relative angle between the projection optical system and the distance detection means can be detected without contact, and it also has the excellent effect of being able to detect minute angles with high precision. .

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an embodiment of the present invention, FIG. 2 is a front view of an example of the linear display means, and FIGS. 3 to 6 are a projected image on the projection plane and distance detection means of the above embodiment. FIG. 2... Straight line display means, 4A, 4B... Straight line, 4
a, 4b...Parallel line, 6...Projection optical system, 6b...
...Imaging lens, 7...Distance detecting means, 8...Processing circuit, 9...Display means.

Claims (1)

[Claims for Utility Model Registration] (1) A straight line display means capable of selectively displaying two straight lines in different directions one by one on the same plane; A projection optical system that projects two parallel linear images onto the same projection plane using two optical paths, and detects the distance between two points of intersection with a parallel line that is provided on the projection plane so as to intersect with the parallel line. 1. A non-contact relative angle detection device comprising a linear distance detection means. (2) The non-contact relative angle detection device according to claim 1, wherein the projection optical system includes a pair of imaging lenses arranged in parallel in a direction perpendicular to the optical axis. . (3) The distance detecting means is a so-called line sensor in which a plurality of optical sensors that convert incident light into electrical signals and output them are arranged in a straight line. The non-contact relative angle detection device described in 2).