JPS6038603A - Spatial coordinate measuring apparatus - Google Patents

Abstract

PURPOSE:To enable the measurement of 2-D coordinate at a high accuracy in a wide range by moving a TV camera horizontally or vertically so that the bright point at the measuring point always comes to the center of the screen of the camera to calculate the 2-D coordinate from the movement thereof. CONSTITUTION:A bright point is generated at the measuring point 2 on the surface of an object 1 by a laser light of a laser light generator 7. The bright point is taken with a TV camera 3 and an image signal is sent to a controller 6. The controller 6 generates a movement signal from a deviation between the bright point position and the specified position of the screen (for example, center of the screen) and drives horizontal and vertical servomotors 4 and 5 to move the camera 3 to let the bright point with the center of the screen. At this point, the movement is measured with angle detectors 8a and 8b to determine the 2-D coordinate with the controller 6. Thus, the 2-D coordinate can be measured at a high accuracy in a wide range.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spatial coordinate measuring device, and is useful for multi-point measurement.

When measuring the spatial coordinates of a target object, it is common to use a scale or transit, but it takes time and effort to align the measurement points, making it unsuitable for multi-point measurements3.
In order to improve this, a method has been devised to capture the target object as an image using an industrial RV camera, etc., and read the coordinates from the position on the screen, but since the screen is fixed and tight, the accuracy and measurement range are at odds. The drawback is that it is rare. .

In short, if you enlarge the image to improve its accuracy, the shooting range will become smaller, and conversely, if you recombine the image, the accuracy will decrease.

In view of the above-mentioned prior art, the present invention provides a spatial coordinate filtration system using images that enables measurement over a wide range without reducing accuracy.
The purpose is to provide complete equipment. The narrow purpose of the present invention is to generate a bright spot with a minute area at the measurement point, and automatically control an industrial 'i' v camera etc. so that the bright spot is always at a predetermined position on the screen. By reading the coordinates (the amount of movement of the camera at this time), the two-dimensional coordinates of multiple points in a plane perpendicular to the camera optical axis are measured.

Embodiments of the present invention will be explained below in detail based on the drawings.

As shown in the figure, in this embodiment, the surface of the object 1 is irradiated with a laser beam generated by a laser beam generator 7, or a small lamp is provided to generate a bright spot at the measurement point 2.

The industrial TV camera 3 photographs part or all of the object l including the measurement point 2, and sends an image signal to the controller 6.

In the controller 6, the industrial 1
' Generate a movement signal for the V-camera 53 and drive the horizontal servo motor 4. A vertical servo motor 5 is used to perform servo control such that the bright spot coincides with a predetermined position. At this time, the horizontal and vertical movement amounts are measured by angle detectors 8a and 8b provided coaxially with each servo motor 4.5.
A dimensional movement amount is detected. Therefore, when moving the coordinates vertically, set the reference point in advance and use the controller 6 to move from the reference point! The coordinates of each measurement point 2 are calculated from MIIt.

Note that it is also possible to use two of these devices to determine p3-dimensional coordinates by triangulation.

According to the present invention, as specifically explained in conjunction with the embodiments above, it is possible to measure the Q coordinate over a wide range with high accuracy.

[Brief explanation of drawings]

The figure is a configuration diagram showing an embodiment of the present invention. In the figure, l is the object, 2 is the measurement point, 3 is an industrial TV camera, 4 is a horizontal servo motor, 5 is a vertical servo motor; 6 is the controller, 7 is a laser beam generator; 8a and 8b are angle detectors. patent applicant Mitsubishi Heavy Industries, Ltd sub-agent Patent Attorney Hikari Ishi Department (1 other person)

Claims (1)

[Claims] Bright spot generating means for generating a bright spot at a measurement point on a target object;
A photographing means for photographing the object including the bright spot, a moving means for moving the photographing means so that the bright spot is at a predetermined position on the screen within the screen photographed by the photographing means, and a moving means for moving the photographing means. A spatial coordinate measuring device characterized by comprising a detecting means for detecting the MJJJ amount and a calculating means for calculating the two-dimensional spatial coordinates of the measurement point of the object from the detected movement amount!
.