JPH02201207A - Method and apparatus for measuring angle of rotation of component part rotatable or rotating - Google Patents

Abstract

PURPOSE: To detect the rotational angle a rotator quickly by performing the measurement of rotational angle on or in the rotator through deflection of light beam and leading a deflected light beam to a fixed light receiving unit. CONSTITUTION: A light beam 5, e.g. a laser beam, from a fixed light source 11 is deflected on a fixed mirror 8 and a reflected light beam 5' is projected to the rotary axis 9' of a rotator 2. A photoconductor 4 is formed or arranged on the rotary axis 9 such that the light beam 5' is led, as a light beam 5", to point 6 on the same end face as the rotator 2 while being spaced apart from the rotary axis 9 of rotator 2. Subsequently, the light beam 5" impinges on a light receiving unit 10. When the rotator 2 rotates, the light beam 5 describes a circular trace of light on the light receiving unit 10 and generates a photocurrent which is evaluated as a rotational angle and displayed. According to the arrangement, rotational angle of a rotator 2 can be detected quickly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method and a device for measuring the angle of rotation of a rotatable or rotating structural part.

[Conventional technology]

In industry, it is often necessary to detect the angle of rotation or the rotational position of rotatable structural, rotating or pivoting parts. For example, inductive, capacitive and photo-optic rotation angle detectors are known in the art.

German Patent No. 2,406,393 discloses a rotary position detector in which a rotating body is provided with a light source that generates a light trace on a fixedly arranged photoelectric element.

Such known methods can only be used for certain purposes, can only measure small angles of rotation, and require the arrangement of conductors to the rotating body or to the light source.

[Problems to be Solved by the Invention] An object of the present invention is to operate in a non-contact manner, to be applicable to a rotating body, to be able to measure angles over 360°, and to require no mechanical connection with the rotating body. The object of the present invention is to provide a method and a device for measuring the angle of rotation of a rotatable or rotating structural part, which can be detected very quickly at a speed of μsec.

[Means to solve the problem]

According to the invention, this object is achieved by directing the light beam of a stationary light source axially, either directly or via a deflecting mirror, onto its axis of rotation at the end face of the structural component, such that the light beam is deflected at the end face or within the structural component. , a method of projecting onto a fixed receiver, and a fixed light source, a turning device built into the structural part for the light ray directed from the light source directly or via a turning mirror axially to the rotation axis of the structural part, and a deflected A suitable device for light beams consists of a fixed receiver with a photoelectric detector. Advantageous embodiments of the invention are described in the patent claims.

〔Example〕

The present invention will be described in detail below with reference to embodiments shown in the drawings.

The drawings all show structural parts 2, such as rotating bodies, rotatably or swingably supported by bearings 1.tl. A rotating body is a shaft, axle, or any other rotatable part.
A light beam 5, for example a laser beam, from a fixed light source 11 is deflected by a fixedly arranged mirror B. The reflected light ray 5' is projected onto the rotation axis 9 of the rotating body 2. A light guide 4 is arranged at the rotation axis 9, which receives and continuously guides the light beam 5'. The light guide 4 is arranged so that the light beam 5' is connected to the rotating body 2 as shown.
is formed or arranged so that it is directed as a ray 5'' to a point 6 on the same end face of the rotating body 2 at a distance from the axis of rotation 9 of the rotary body 2.The ray 5'' is then preferably of the planar light type. This corresponds to a light receiving device formed as a detector 10. When the rotating body 2 rotates, the light beam 5 traces a circular light trace on the rechargeable detector 10, which generates a photoelectric current. The photoelectric current is evaluated and displayed as a rotation angle via a measurement amplifier (not shown). In this case, a rotation angle of 360° can be detected.

From FIG. 2, the rotation axis or light introduction point 9 and light extraction point 6 on the end face of the rotating body 2 can be understood.

Figures 3 and 4 show a structure in which the diversion of light takes place via a mirror placed on a rotating body. Similar to the embodiment in FIG. 1, the light ray 5 coming from the light source is #A
8 to the rotational axis 9 of the rotating body 2 (ray 5
), here a stop 12 is arranged on the axis of rotation 9, and this SQ 12 projects a light beam 5' via another 1113 onto a photoelectric detector lO. Here, the light ray 5# generates a circular light trace when the rotating body 2 rotates. The evaluation is performed as in the embodiment shown in FIG.

In the illustrated embodiment, the canopies 12, 13 are each arranged at an angle of 45° with respect to the rotation axis 9, so that the reflected light ff15' is connected to the light ray 5' incident on the mirror 2. run parallel. However, it is also possible to arrange the mirror so that the reflected ray 5' is not parallel to the ray 5'.

From FIG. 4, the mirror surface 12° 13 on the end face of the rotating body 2 can be understood. These mirror surfaces can be limited to the area of the axis of rotation 9 and the area of the projection point of the light beam reflected by the mirror 12.

5 and 6 show a light ray 5 coming from a light source 11.
A structure is shown in which the light beam 5 is led out of the rotating body 2 in the radial or circumferential direction.

In this case, the light receiving device 10 is in each case formed as an annular photoelectric detector arranged around the rotating body 2. When the rotating body 2 rotates, the light beam 5 generates a light trace on the photoelectric detector. , this light trace is evaluated as the ζ rotation angle using a suitable evaluation device. In the embodiment of FIG. 5, a light guide 4 is provided for deflecting the light beam, which deflects the light source 5 from axial to radial direction (light MS").
In the arrangement shown, the light beam 5 runs in the bore of the rotating body 2 and is deflected via the mirror 12, in particular by 90° in the radial direction 1 or in the direction of the circumference. No mirror!
2 can also be arranged on the end face of the rotary body, and the position detector 10 can be arranged correspondingly, unlike the embodiments shown in FIGS. 5 and 6.

FIGS. 7 and 8 show a JRllll in which light is introduced and led out at opposite end faces of the rotating body 2, respectively. The light source 11 and the photoelectric detector IO are arranged accordingly. In FIG. 7, the light guide 4 receives the light beam 5, deflects it and directs it as a light beam 5'' to the detector lO.
In FIG. 8, brackets 12 and 13 are provided for beam deflection. Both of these embodiments correspond in other respects to the embodiments described above.

In the case of the real B can example shown in FIGS. 5 to 8, the light beam 5 of the light source 11 is directed directly to the end face of the rotating body 2 or to the rotation axis 9. However, the light source 5 can also be introduced via a deflecting mirror 8 as in the embodiment of FIGS. 1 to 3, or vice versa.
In the embodiments shown in FIGS. 3 to 3, it is also possible to introduce the light beam into the rotating body directly at the axis of rotation.

〔Effect of the invention〕

The present invention does not require mechanical connections in the rotating body,
The rotational angle measurement is carried out on or in the rotating body via beam deflection, and the deflected light beam is guided to a stationary receiver, so that it is particularly transparent to the rotating body. The light source and the light receiver, which is preferably designed as a position detector, can be arranged stationary and do not generate acceleration forces.

The light beam for angle detection can be led out of the rotary body at the end face of the rotary body as well as at its circumference, and the deflection device inside the zero rotary body directed toward the light receiving device can consist of a light guide or a mirror.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a rotating body having a light guide through which light is introduced and extracted from one end face, Fig. 20 is an end view of the rotating body in Fig. 1, and Fig. 3 is a schematic side view of a rotating body having a light guide through which light is introduced and extracted from one end face. A schematic side view of a rotating body that serves as a mirror device through which light is extracted;
Figure 4C is an end view of the rotating body shown in Figure 3, Figure 5 is a schematic side view of the rotating body having a guide body from which light is emitted from the circumference, and Figure 6 is a schematic side view of the rotating body from the circumference. FIG. 7 is a schematic side view of a rotary body with a pupil from which light is led out; FIG. FIG. 2 is a schematic side view of a rotating body with a mirror in which the derivation takes place on the opposite end face; Structural parts Beam turning mirror Rotating axis Light receiving device Light source mirror Kagamide 1 person representative Sato -Yuu Fi (i, 1 Fig, 6

Claims (1)

Claims: 1. The light beam (5) of the fixed light source (11) is directed axially, either directly or via a deflecting mirror (8), to its axis of rotation (9) at the end face of the structural component (2), Measuring the angle of rotation of a rotatable or rotating structural part, characterized in that the light beam (5) is deflected at its end face or inside the structural part (2) and is projected onto a fixed receiver (10). Method. 2. Method according to claim 1, characterized in that the light beam is projected onto the light receiving device (10) at the end face of the structural component (2) towards which the light beam is directed or at the opposite end face thereof. 3. Method according to claim 1, characterized in that the light beam is projected onto the light receiving device (10) at the circumference of the structural part (2). 4. A fixed light source (11), on the structural part (2) for the light beam directed from the light source (11) directly or through a deflecting mirror (8) in the axial direction to the rotation axis (9) of the structural part (2). Rotatable, characterized in that it consists of an integrated deflection device (4, 12, 13) and a stationary receiver (10), preferably with a photoelectric detector for the deflected beam (5). A device that measures the rotation angle of a rotating structural component. 5. The turning device consists of a light guide (4), which
), which receives the rays (5, 5') at the axis of rotation (9) of the structural part (2) and directs them from the axis of rotation (9) on the same or opposite end face of the structural part (2). 5. Device according to claim 4, characterized in that it is arranged such that it leads out to the light receiving device (10) at intervals or at the circumference of the structural part (2). 6. The deflection device consists of a mirror or mirror system (12, 13), which receives the beam (5, 5') at the axis of rotation (9) of the structural part (2) and directs it to the same side of the structural part (2). Alternatively, it is led out to the light receiving device (10) at a distance from the rotation axis (9) at the opposite end face, or led out to the light receiving device (10) at the circumference of the structural component (2). 4. The device according to 4. 7. Device according to any one of claims 4 to 6, characterized in that the light source (11) is a laser light source.