JPH058426U - Rotary encoder - Google Patents

Abstract

(57) [Summary] [Object] To provide an absolute rotary encoder capable of detecting a rotation angle of 360 degrees or less and also capable of detecting a rotation angle of more than 360 degrees. [Structure] In addition to the structure of a conventional absolute type rotary encoder, a deceleration mechanism 7 for transmitting the rotation of an input rotating shaft 2 and a decelerating rotation according to the rotation of the input rotating shaft 2 transmitted through the decelerating mechanism 7. Driven disk 8 to
Sensors 9 and 10 for detecting the rotation amount of the driven disk 8.
Is provided, and the rotation of the input rotary shaft by 360 degrees or more, that is, the number of rotations is detected by the outputs of the sensors 9 and 10.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotary encoder, and more particularly to an absolute type rotary encoder.

[0002]

[Prior Art]

 Generally, an absolute type rotary encoder outputs a signal of the absolute position according to the rotation angle in parallel regardless of the presence or absence of rotation. Therefore, a counter like an incremental type rotary encoder is required. It is possible to always check the rotational position without doing so.

[0003]

[Problems to be solved by the device]

 However, in such a conventional absolute type rotary encoder, if one rotation is made, the same data is output before and after the rotation. For example, when the rotation angle is 5 degrees and when the rotation angle is 365 degrees. And, the same data will be obtained.

Therefore, in a multi-rotation system having a rotation angle of 360 degrees or more, there is a drawback that the rotation position cannot be detected.

The present invention has been made in view of the above points, and is an absolute rotary that can detect a rotation angle of 360 degrees or less and can detect a rotation angle of more than 360 degrees. The purpose is to provide an encoder.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is configured as follows.

That is, the present invention includes an absolute type disc that includes a disc that rotates integrally with an input rotary shaft, and that reads a pattern formed on the disc to detect a rotation angle of 0 to 360 degrees of the input rotary shaft. In the rotary encoder, the speed reduction mechanism that transmits the rotation of the input rotation shaft, the driven disk that is decelerated and rotated according to the rotation of the input rotation shaft that is transmitted through the speed reduction mechanism, and the rotation amount of the driven disk are detected. Is provided, and the rotation of the input rotary shaft over 360 degrees is detected by the output of the sensor.

[0008]

[Action]

 According to the above configuration, since the driven disk that decelerates and rotates according to the rotation of the input rotary shaft through the speed reduction mechanism and the sensor that detects the rotation amount of the driven disk are provided, the rotation of the input rotary shaft by 360 degrees or more. That is, the number of rotations of the input rotation shaft can be known by detecting the rotation amount of the driven disk with a sensor, and the rotation angle of 360 degrees or less can be detected with the same configuration as the conventional example. You can

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention. FIG. 1 (A) is a sectional view seen from the front, and FIG. 1 (B) is seen from a section line CC. FIG.

The input rotary shaft 2 in the case 1 is provided with a disk 3 that rotates integrally with the input rotary shaft 2. A pattern is formed on the disk 3, and a light emitting element 4, a fixed slit 5 and a light receiving element 6 are provided to read the pattern. In this embodiment, eight light emitting elements 4 and light receiving elements 6 are provided, and an 8-bit code output is obtained from 0 to 360 degrees of the input rotation shaft according to the rotation angle.

The above configuration is similar to that of the conventional absolute type rotary encoder.

In this embodiment, in order to be applicable to a multi-rotation system having a rotation angle of 360 degrees or more, the following configuration is adopted.

That is, the deceleration mechanism 7 that decelerates and transmits the rotation of the input rotary shaft 2 and the input rotary shaft 2 that is transmitted through the reducer mechanism 7 decelerates and rotates around the input rotary shaft 2. A driven disk 8 and a light emitting element 9 and a light receiving element 10 as sensors for detecting the amount of rotation of the driven disk 8 are provided.

The reduction mechanism 7 includes a first gear 11 fixed to the input rotary shaft 2 and three second gears 12 meshing with the first gear 11 and a gear 8 a provided on the inner circumference of the driven disk 8. And is configured to decelerate the rotation of the input rotary shaft 2 and transmit it to the driven disk 8.

The driven disk 8 is provided with the gear 8a on the inner circumference as described above, and is also formed with a large number of slits 13 along the outer circumference as shown in FIG. The driven disk 8 is configured to be displaced by a predetermined angle when the rotation of the input rotary shaft 2 is transmitted via the transmission mechanism 7 and the input rotary shaft 2 makes one rotation. In order to detect the amount of rotation of the driven disk 8, that is, the angular displacement, a light emitting element 9 and a light receiving element 10 are arranged so as to face each other with the disk 8 in between, and the light receiving element 10 is a driven disk. Light is received from the light emitting element 9 due to the passage of the slit 13 due to the rotation of 8 and its output is given to a signal processing circuit (not shown).

In this embodiment, each time the input rotary shaft 2 makes one rotation, the driven disk 8 is displaced by a predetermined angle, and a predetermined number of slits 13 pass between the light emitting element 9 and the light receiving element 10, so that a constant value is obtained. The pulse of is obtained. That is, it is possible to detect how many rotations the input rotary shaft 2 has made.

Therefore, according to the rotary encoder of this embodiment, the rotation angle of 0 to 360 degrees of the input rotary shaft 2 can be detected and the driven disk driven via the speed reduction mechanism 7 by the same configuration as the conventional example. By detecting the rotation amount of 8, the number of rotations of the input rotation shaft 2 can be detected, and the rotation angle of the multi-rotation system can be detected.

[0019]

[Effect of the device]

 As described above, according to the present invention, the number of rotations of the input rotary shaft can be known by detecting the rotation amount of the driven disk with a sensor, and the rotation angle of 0 to 360 degrees is conventionally known. It is possible to detect with the same configuration as the example, and therefore, it is possible to detect a rotation angle of 360 degrees or less and also a rotation angle of more than 360 degrees.

[Brief description of drawings]

FIG. 1 is a sectional view showing a schematic configuration of an embodiment of the present invention.

[Explanation of symbols]

 2 Input rotating shaft 3 Disk 7 Reduction mechanism 8 Driven disk 9 Light emitting element 10 Light receiving element

Claims (1)

Claims for utility model registration: 1. A disc rotating integrally with an input rotary shaft is provided, and a pattern formed on the disc is read to detect a rotation angle of 0 to 360 degrees of the input rotary shaft. In the absolute type rotary encoder, a reduction mechanism for transmitting the rotation of the input rotation shaft, a driven disk decelerated and rotated according to the rotation of the input rotation shaft transmitted via the reduction mechanism, and a rotation amount of the driven disk. And a sensor for detecting the rotation of the input rotary shaft, the rotary encoder detecting the rotation of the input rotary shaft by 360 degrees or more.