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Rotation angle detection device

A technology of rotation angle detection and rotation angle, applied in measuring devices, electromagnetic measuring devices, and electric devices, etc., can solve problems such as large-scale, high-cost, and difficult-to-form

Pending Publication Date: 2022-05-27
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For a code wheel having two kinds of scales for detecting the rotation angle and for detecting the reference angle, since it is necessary to form the scale for detecting the reference angle with high precision, compared with a code wheel having only the scale for detecting the rotation angle , difficult to form, large and costly
In addition, because the sensor for the rotation angle detection device using the code wheel needs to have both the circuit for the rotation angle detection and the circuit for the reference angle detection, it is different from the rotation angle of the code wheel using only the scale for the rotation angle detection. Compared with the sensor used in the detection device, it is larger and more expensive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0021] like figure 1 As shown, as an example, the rotation angle detection device according to the first embodiment is mounted on the object detection device 100 and used. The object detection device 100 is, for example, a Lidar (Light Detection and Ranging), and includes a control unit 10 , a light-emitting unit 22 , a rotating body 24 , a light-receiving unit 26 , an actuator 30 , an actuator driving unit 32 , and a rotary Angle detection unit 50 .

[0022] The control unit 10 is a microprocessor, FPGA, ASIC, SoC, or the like including an arithmetic unit, a storage unit, and an input / output unit, and develops and executes various programs stored in the storage unit in the storage unit. The rotation angle detected by 50 is used to control the operation of the actuator 30 . Further, the actuator 30 is used as a drive unit of the rotating body 24 that rotates integrally with the rotating shaft 40 , and the detection orientation of the object is detected by the rotation of the...

no. 2 approach

[0054] In the first embodiment, it is assumed that the light emitting unit 532 of the rotation angle detection device 50 (see figure 2 ) by applying a preset voltage from the light emission drive unit 536 to the configuration in which the detection region 514 of the rotary scale 510 is irradiated with light of a light amount corresponding to the applied voltage has been described. On the other hand, the light emission driving unit 536 may automatically control the light emission of the light emitting unit 22 by controlling the applied voltage so that the light amount actually received by the light receiving unit 534 falls within the range of the predetermined light amount. This automatic control of the amount of emitted light is also referred to as APC (Automatic Power Control). In addition, the APC may be a method of automatically controlling not only the amount of emitted light but also the light-receiving sensitivity (so-called gain) of the light-receiving section.

[0055]...

no. 3 approach

[0060] The rotary scale 510 of the first embodiment (see figure 2 ) A detected area 514 and a non-detected area 516 are formed on the disk surface 512 which is a plane perpendicular to the central axis Ar. In contrast, it is also possible to use Figure 8 Like the illustrated rotary scale 510c, a detection area 514c and a non-detection area 516c are formed on a side surface 518 that is a curved surface along the circumferential direction of the central axis Ar. Even with this rotary scale 510c, the same effect as that of the first embodiment can be obtained.

[0061] In addition, although illustration is abbreviate|omitted, the non-detection area 516c may be made into the structure similar to the rotary scale 510a, 510b of 2nd Embodiment.

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Abstract

A rotation angle detection device (50) for detecting the rotation angle of an object is provided with: an incremental rotation scale (510) that rotates integrally with the object; a detected region (514) in which a scale for detecting the rotation angle is formed and a non-detected region (516) in which the scale is not formed and which sandwiches the detected region are provided in a region along the circumferential direction of rotation; and a detection unit (520) that obtains, on the basis of at least an input signal corresponding to the displacement of the position of the scale in the region to be detected, an electric signal that periodically changes in accordance with the displacement of the position of the scale in the region to be detected, the position of the scale in the region to be detected changing in accordance with the displacement of the rotation angle of the object.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims priority based on Japanese Patent Application No. 2019-188329 filed on October 15, 2019, the entire disclosure of which is incorporated herein by reference. technical field [0003] The present disclosure relates to a rotation angle detection device. Background technique [0004] As an incremental rotation angle detection device, for example, a scale having a rotation angle detection scale provided over the entire circumference in the circumferential direction and a reference angle detection provided at one reference position in the circumferential direction are frequently used. A dial of a scale (for example, Japanese Patent Application Laid-Open No. 7-43134). [0005] For a code wheel having two scales for detecting the rotation angle and for detecting the reference angle, it is necessary to form the scale for detecting the reference angle with high accuracy, so it is more difficult to compare...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/245G01D5/347
CPCG01D5/2451G01D5/34707G01D5/2457G01B7/004G01B7/30
Inventor 水野文明
Owner DENSO CORP