JPS62231916A - Photoelectric positioning device - Google Patents

Abstract

PURPOSE:To position an object body at a specific position photoelectrically with high accuracy by placing a member for position detection provided to part of the object body in luminous flux, rotating the position detecting member, and utilizing the output signal which is obtained by a photodetecting means at this time. CONSTITUTION:For example, the position detecting member 31 is put in the luminous flux 23 and the center of rotation of the position detecting member 31 is aligned with the center of the luminous flux 23. At this this time, the position detecting member 31 is rotated as shown by an arrow, so the quantity of light incident on the photodetecting means 2 after passing the outside of the position detecting member 31 varies having a waveform shown in a figure at every period while the angle of rotation of the position detecting member 31 is indicated on the lateral axis. Namely, output signals of two waveforms which are exactly equal to each other are obtained from the photodetecting means 2 according to the rotation of the position detecting member 31. Consequently, the object body is positioned.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a photoelectric positioning device, which uses a photoelectric method suitable for positioning a target object at a certain position with good WILK accuracy. Related to positioning devices.

(Prior art) Conventionally, the position of a target object has been detected by an all-photoelectric method, whereas the so-called photoelectric method has been used to detect whether a target object matches a predetermined position of another object by an all-photoelectric method. Various positioning devices have been proposed.

For example, if a position detection member is provided on a part of the target object, then this position detection member matches the reference position of a multi-divided light receiving element such as a position sensor installed at a predetermined position on another object. A number of positioning devices have been proposed that photoelectrically detect the presence or absence of an object using output signals from each light-receiving element. This positioning device has relatively high accuracy and is used in various fields.

In this case, position sensors, 2-split light receiving elements, 4-split light receiving elements, etc. have small light receiving surfaces, so when determining whether the position detection member matches the reference position or not, the target object is within a certain range. The disadvantage is that it cannot be detected until it is detected.

In addition, in many conventional positioning devices, when attempting to position a target object with high precision, the light receiving area of the light receiving means must be made small to detect the degree of alignment with the position detection member, resulting in a narrow measurement range. There were drawbacks.

(Problems to be Solved by the Invention) An object of the present invention is to provide a photoelectric positioning device that is capable of accurately positioning a target object at a predetermined position over a wide range with a simple structure.

(Means for resolving problem 1ktIs) Between a light projecting means for emitting a light beam having a cross section of a predetermined shape and a light receiving means for receiving the light flux t from the light projecting means, the light projecting means and the light receiving means are connected to each other. By inserting an opaque rotatable position detecting member having a shape that allows part of the light flux to pass through the frame and rotating the position detecting member, the light flux passing around the position detecting member can be reduced. is guided to the light receiving means, and relative positioning between the center of the light beam and the position detection member is performed using an output signal from the light receiving means.

(Embodiment) Fig. 1 is a schematic diagram of a vertical cross section of an optical system according to an embodiment of the present invention.
2 is a schematic plan view of FIG. 1; FIG.

In the figure, reference numeral 1 denotes a light projecting means 69-, which projects the luminous flux from the light source 11 in a shape such as a cone, a cylinder, or a fan shape diverging on one plane using a slit 12, a light projecting lens 13, etc. There is. In this embodiment, the light beam 23 is diverged in a narrow fan shape. Reference numeral 2 denotes a light receiving means, which guides the light beam 23 from the light projecting means 1 onto the surface of the light receiving element 22 using a light receiving lens 21 or the like.

3 is the target object to align* with the predetermined position, 6, -@V
A position Ii1 detection member 31 is provided that can be rotated by C. The position detecting member 31Vi (consisting of an opaque semicircular rotating body) is inserted into the light beam n emitted from the projection means l. The light beam passing through the outside II of the position detection member 31 is configured to enter the light receiving means 2.

As shown in Figure 2, the position detection member 31 is inserted into the light beam n, and the rotation center of the right position detection member 310 and the light beam 23
Suppose that the center of

The position detection member 31 is moved in the direction of the arrow shown in the figure.
lk, the amount of light that passes outside the position detection member 31 and enters the light receiving means is expressed as tlLfk shown in FIG. Become.

That is, as the position detection member 310 rotates, the light receiving means 2 obtains output signals with two completely equal waveforms as shown in FIG. 3.On the other hand, as shown in FIG. If the center does not coincide with the center of the light beam n, the amount of light that passes outside the position detection member 31 and enters the light receiving means 2 is the third
When expressed in the same manner as shown in the figure, it becomes as shown in FIG.

That is, two asymmetrical waveform output signals are obtained from the light receiving means 2 as the position detection member 310 rotates.

In this embodiment, the position detection member 31 of the target object 3 is
3, and as the position detection member 3101 rotates, the light receiving means 2 detects a position where output signals of two equal wavelengths are obtained. It matches.

In this embodiment, if a projection lens with strong refractive power is used as the projection means and the beam diameter is expanded, the object can be positioned over a wider range.

(Effects of the Invention) According to the present invention, a position detection member provided with a part of the target object is inserted into the light beam, the position detection member is rotated, and the output signal from the light receiving means obtained at this time is By utilizing this, it is possible to achieve a photoelectric positioning device that can photoelectrically position a target object at a predetermined position with high precision. Invisible infrared light, ultraviolet light, etc. can also be used by changing the light source of the light projecting means and the light receiving element of the light receiving means.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a longitudinal section of an optical system according to an embodiment of the present invention;
FIG. 2 is a top plan view of FIG. 1, FIGS. 3 and 5 are explanatory diagrams of the output wavelength obtained from the light receiving means shown in FIG. 1, and FIG. 4 is an explanatory diagram of another form of FIG. 2. It is. In the figure, 1 is a light projecting means, 2Fi light receiving means, 3 is a target object, 3
1, the position detection member S23 is a light beam.

Claims (1)

[Claims] A light projecting means that emits a light beam having a cross section of a predetermined shape, a light receiving means that receives the light beam from the light projecting means, and a shape that blocks a part of the light beam between the light projecting means and the light receiving means. By inserting an opaque rotatable position detecting member with a rotatable position detecting member and rotating the position detecting member, a light flux passing around the position detecting member is guided to the light receiving means, and the light receiving means A photoelectric positioning device, characterized in that the relative positioning of the center of the light beam and the position detection member is performed using an output signal from the.