JPH0378604A - positioning device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a positioning device for a transparent and axially symmetrical object such as a lens.

[Prior Art] As shown in FIG. 2, the conventional positioning device captures an image of the object to be measured 3 using a TV camera 7 placed in a direction perpendicular to the plane of movement, and uses an image processing device 8 to capture an image of the object to be measured 3.
The center of gravity is determined, and the moving device 4 is used to move the object based on the amount of deviation from the desired center of gravity position, thereby determining the position.

[Issue to be solved by the invention] However, since the conventional positioning device captures the entire image of the object to be measured using a mechanical TV camera, it is difficult to detect transparent objects such as lenses, and moreover, when the object to be measured is large, it is difficult to detect transparent objects such as lenses. Because of the large resolution, highly accurate positioning was not possible. Furthermore, since it is not possible to select the area that serves as the reference for positioning in the optical axis direction of the 1TV camera, the reference plane is
In cases where there is a blind spot for the TV camera or where the object to be measured is located on the bottom (wide), some kind of ingenuity is required.

SUMMARY OF THE INVENTION The present invention is intended to solve these problems, and aims to position a transparent and axially symmetrical object such as a lens with high precision and high speed in an arbitrary area based on the outer diameter.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a laser outer diameter measuring machine that uses a laser scanning optical system to measure the outer diameter of an object and a distance from a reference position, and a laser A calculation device that inputs signals from an outer diameter measuring machine to determine the outer diameter center position and outputs the amount of deviation from the target position, and a movement that inputs the amount of deviation and moves the object to be measured to the target position. It is characterized by consisting of a device.

[Example code] Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a plan view showing an embodiment of the present invention. In the figure, reference numeral 1 is a light transmitting system of a laser outer diameter measuring device, and reference numeral 2 is a light receiving system. Two systems of laser outer diameter measuring machines measure the outer diameter of the object 3 and the distance from the reference surface 9 from two directions, respectively. Reference numeral 2 in the figure is a calculation device, which calculates the outer diameter center position from the outer diameter data of the object 3 measured from two directions by the laser outer diameter measuring machine and the distance data from the reference plane, and moves it from the target position. Outputs the amount of deviation in two directions.

Reference numeral 4 in the figure is a two-dimensional moving device, which moves in a direction that makes the input deviation amounts in two directions zero. Since the laser outer diameter measuring machine uses a laser optical system, the detection range is as wide as several tens of millimeters (and the resolution is about 15 microns, so the outer diameter center position can be determined with high precision of 2 to 3 microns). Therefore, by using a moving device that has a highly accurate linear guide and position detection mechanism and a closed-loop controlled drive mechanism, positioning can be performed with an accuracy of several microns.

FIG. 5 is a schematic diagram illustrating a method for determining the outer diameter center position from the measured values by the laser outer diameter measuring device. As is well known, a laser outer diameter measuring machine instantly measures the distance L1 from the reference plane to the edge of the object and the outer diameter L2 of the object by measuring the time that the laser beam is blocked by the object. Output. The calculation device uses data L1 obtained from the outer diameter measuring machine.
．． Using L2, L 5 = L 1 + L 2 /
Perform the calculation 2, locate the center of the outer diameter, and calculate 3.

FIG. 4 is a schematic diagram showing the output of the light receiving section of the laser outer diameter measuring device. Here, tl corresponds to the distance fiL1 from the reference plane to the edge of the object to be measured, and t2 corresponds to the outer diameter L2 of the object to be measured. If the object to be measured is not transparent, the laser beam irradiated onto the object is completely blocked by the object, so the output of the light receiving section becomes almost zero, as indicated by reference numeral 10 in the figure. Therefore, by measuring the falling and rising opening times of the output, the outer diameter of the object to be measured can be measured.

On the other hand, when the object to be measured is transparent, most of the laser light passes through the object. However, since scattering occurs at the edges as indicated by reference numeral 11 in the figure, the outer diameter of the object to be measured can be measured by measuring the amount of scattering caused by the edges.

FIG. 5 is a schematic diagram showing an example of measurement. When the reference surface of the measurement object 3 is a specific part 12 of the measurement object, the specific part 12 can be used as a reference by adjusting the measurement object or the laser outer diameter measuring device so that the laser beam is irradiated onto the reference surface. [Effects of the Invention] As explained above, the present invention detects the outer diameter center position of the object to be measured using a laser outer diameter measuring device, thereby enabling accurate positioning of transparent and axially symmetrical objects such as lenses. There is an effect that positioning can be performed with high precision and high speed based on the outer diameter in any region.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of the positioning device of the present invention, Fig. 2 is a schematic diagram of a conventional positioning device, and Fig. 3 is a schematic diagram showing a method for determining the outer diameter center position from the measured value with a laser outer diameter measuring machine. ,
FIG. 4 is a schematic diagram showing the output of the light receiving section of the laser outer diameter measuring machine, and FIG. 5 is a schematic diagram showing an example of measurement. 1... Laser outer diameter measuring machine light transmitting system 1 2... Laser outer diameter measuring machine light receiving system 3...
・・・・・・Measurement object 4・・・・・・Two-dimensional movement device 5・・・・・・Calculation device 6・・・・・・・L/−4 Light 7 .........Engineer TV camera 8...Image processing device 9...Reference plane 0...Measurement object Output graph when the object is not transparent...Output graph 2 when the measurement object is transparent
・・・・・・・・・More than the specific part that becomes the reference surface

Claims (1)

[Claims] A laser outer diameter measuring machine that measures the outer diameter of the object to be measured and the distance from the reference position using a laser scanning optical system, and inputting signals from the laser outer diameter measuring machine to determine the outer diameter center position,
A positioning device comprising: an arithmetic device that outputs the amount of deviation from a target position; and a moving device that inputs the amount of deviation and moves the object to the target position.