JPH0443777Y2 - - Google Patents

Description

[Detailed description of the invention] This invention eliminates the difference in the timing of turning on or off the outputs of different phases when it is desired to turn on or off the outputs of two or more conductive phases at the same time in a contact encoder. The present invention relates to a code plate for an encoder characterized by:

In a contact type encoder, a well-known code plate is used, for example as shown in FIG. 1, and the slider 4 is rotated and slid in a clockwise direction around an axis 4a on the conductive pattern of the code plate. Two-phase (e.g. A
If you want to ensure that there is no deviation in the output timing of two phases (phase 2, B phase 3), that is, A
A timing difference Tα between the outputs from the end 5a of the phase conductive band 5 and the end 6a of the B-phase conductive band 6, respectively.
In order to turn ON by eliminating the output timing, the output timing is adjusted for each phase, so the error α between different phases can be virtually eliminated in the process of forming a conductive phase pattern using printing or coating. Therefore, the control for improving manufacturing accuracy was extremely strict.

Among the above-mentioned disadvantages, as a conventional example of an encoder code plate that can obtain ON or OFF timing of different phases at the same time, the same applicant as the present application has proposed the one shown in FIGS. 3 and 4. It was previously provided by Utility Application No. 58-36767. In the encoder code plate shown in FIG. 3, the output timing is determined by the end 11a of the collector electrode, and the end 15a of the conductive band 15 of the A phase 12 and the end 15a of the conductive band 15 of the B phase 1
The synchronization of the timings output at the ends 16a of the conductive bands 16 in No. 3 was made so as not to be affected by the errors α and β. Since the ON and OFF bands 11b are present on the conductive pattern of the collector electrode 11, etc., the manufacturing process still requires an insulating material application step to form the OFF bands.

The present invention is based on the above-mentioned earlier application by the same applicant, and further provides an encoder code plate that facilitates maintaining the accuracy of output timing and simplifies the manufacturing process.

FIG. 5 is a pattern diagram of an encoder code plate showing an embodiment according to the present invention. 21 is a collector electrode having two sliding contact parts 21A, 22 and 23 are A conductive phase and B conductive phase, respectively, 24 is a slider;
4a and 24b indicate the locus (sliding range) of the slider 24.

FIG. 6 is an output timing diagram in an embodiment of the present invention.

First, when the slider 24 starts rotating around the axis in the direction of the arrow (counterclockwise) from the position shown in the figure,
It contacts the edge 22a of the A phase 22. At this time, the slider 24 is not in contact with the collector electrode, so no output is produced yet. When the slider 24 further rotates, it next contacts the edge 23a of the B phase, but the slider 24
Since it is not yet in contact with 1, it is not output as expected.

Finally, the slider 2 is attached to the edge 21a of the collector electrode 21.
4 comes into contact, at this point the A phase and B phase will simultaneously output an ON output. That is,
Even if errors α and β (of course they may be opposite) exist between the A phase and the B phase, the outputs are made at the same time.

Further, the slider 24 rotates, and the edge 21b of the collector electrode
At this time, the A-phase and B-phase outputs are cut off simultaneously. That is, the output is OFF at the same time. Similarly, in the edges 21c and 21d, A phase, B phase
The phase output can be controlled by the collector electrode 21.

In addition, in this example, the collector electrode simultaneously controls ON and OFF of the two-phase output, and the collector electrode
By arranging the conductive portion 21B outside the sliding range of the slider without providing an OFF band, an output OFF portion is formed. This eliminates the need for printing or coating the collector electrode with an insulating material, making it possible to omit part of the manufacturing process. Of course, the present invention does not preclude the provision of an output OFF section for each phase independently as shown in Figs. 1 and 3, as shown in Figs. isn't it.

In the present invention, since the output timing is controlled by the collector electrode, the accuracy of the output timing is improved by increasing the positional accuracy of the collector electrode. For this purpose, especially in the case of a rotating type, by arranging the collector electrode on the outer periphery, if the center is on the same axis, the position (angle) error will be detected at a position away from the axis, and the inner Accuracy can be improved more easily than when disposed around the circumference, and it is less affected by eccentricity of the slider.

In this embodiment, the slider is of a rotating type, but it may be of any other type, such as a linear movement type, and of course is not limited to clockwise or counterclockwise rotation. Although the same output timing is set at two locations, it does not matter whether it is at one location or at three or more locations.
Also, rotation (or linear movement) in the same direction
It does not matter if only one of ON and OFF outputs can be obtained, and it may be a more preferable example when controlling outputs of three phases or more.

As described above, by using the present invention, it is possible to easily synchronize the outputs of different phases, and the precision control of pattern manufacturing can be strongly concentrated only on the collector electrode, which further improves the effect in the case of multi-phase products. The effect is remarkable, and by providing the collector electrode on the outer periphery, the effect is improved especially in rotating type, and it is also possible to omit the step of setting the insulation part for the collector electrode. A code plate for an encoder can be obtained by simply forming a code plate.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a well-known code pattern.
FIG. 2 is a well-known output timing diagram, FIG. 3 is a plan view showing a conventional code pattern, FIG. 4 is a conventional output timing diagram, and FIG. 5 is a code plate pattern according to an embodiment of the present invention. FIG. 6 is a plan view showing the output timing of this embodiment. 1, 11, 21... collector electrode, 2, 12, 22...
...Conductive phase A, 3, 13, 23... Conductive phase B, 4,
14, 24...Slider.

Claims (1)

[Claims for Utility Model Registration] (1) A collector electrode and a plurality of conductive phases from which output can be obtained individually are arranged so that they do not intersect with each other, and the collector electrode and the plurality of conductive phases are simultaneously slid. A single slider that can be brought into contact with the slider and moved in a fixed trajectory is provided, and the collector electrode is further provided with an appropriate number of sliding contact portions that come into contact with and separate from the slider, and the slider The outputs of multiple phases are turned on by connecting and separating the sliding contact part.
Or a code plate for encoders that is characterized by synchronizing the OFF timing. (2) The code plate for an encoder according to claim 1, wherein a plurality of conductive phases are arranged in an arc shape and a collector electrode is provided on the outer periphery of the conductive phases.