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Angle detection device and scan-type actuator using the same

An angle detection and actuator technology, applied in the direction of measuring devices, electrical devices, optical devices, etc., can solve the problems of time-consuming and labor-intensive calibration processing, encoder slit scanning angle errors, and poor maintainability, etc. Achieve the effect of high angle detection, easy precision and simple structure

Inactive Publication Date: 2008-07-30
NHK SPRING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in the case of obtaining by estimating the scanning angle, it is necessary to grasp the correlation between the angle of the movable part and the trajectory of the movable part in advance, and convert the result into data for correction. And the problem of poor maintainability
[0010] On the other hand, in order to solve the problem caused by this inference method, it is considered to arrange encoder slits (encoder slits) or magnetic rulers, etc. substantially continuously on the trajectory of the movable part, and to use photosensitive elements, magnetic sensitive elements, etc. to detect scanning. Angle, in this case, the same as the case of using the encoder motor will cause the problem of cost increase
That is, in a scanning actuator using a leaf spring or the like, since the center of rotation of the movable part moves depending on the scanning angle, the interval of the encoder slits arranged on the trajectory of the movable part corresponding to the scanning angle becomes complicated. , requiring high configuration accuracy, there will be a problem that the interval error of the encoder slit becomes a large scanning angle error
In addition, there is a problem that a lot of time and labor are required for calibration processing for eliminating the error.

Method used

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  • Angle detection device and scan-type actuator using the same
  • Angle detection device and scan-type actuator using the same
  • Angle detection device and scan-type actuator using the same

Examples

Experimental program
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Effect test

Embodiment approach

[0092] figure 1 It is a diagram showing a partial configuration of a scanning actuator including an angle detection device according to Embodiment 1 of the present invention. in addition, figure 2 yes means figure 1 Schematic diagram of the overall brief structure of the scanning actuator shown. This scanning actuator is a scanning actuator for road and traffic infrastructure, and constitutes a part of a scanning laser radar device.

[0093] exist figure 1 as well as figure 2 Among them, this scanning actuator has a movable part 3 that reflects laser light output from a light emitting part 14 and scans at a predetermined angle. The movable part 3 is connected to the fixed part 1 via the leaf spring 2 which is an elastic body. The movable part 3 is composed of a plate-shaped member arranged perpendicularly to the reflection direction of the scanned laser light, and the moving coil 6 is provided on the opposite side of the reflection surface of the laser light. The movi...

Embodiment approach 2

[0130] Next, Embodiment 2 of the present invention will be described. In the first embodiment described above, the longitudinal direction of the slits 4 of the encoder slit plates 4R, 4L is set to be the same as the longitudinal direction of the movable part 3 at rest, and the variation distance in the y direction is detected. In the method 2, the longitudinal direction of the slit is formed to be perpendicular to the longitudinal direction of the movable part 3 at rest, and the variation distance in the x direction is detected.

[0131] 13 is a diagram showing a detailed configuration of a movable portion and an encoder slit plate of an angle detection device according to Embodiment 2 of the present invention. in addition, Figure 14 It is a diagram showing the positional relationship between the movable part 3 and the encoder slit plates 4A, 4B of the angle detection device according to Embodiment 2 of the present invention. in Figure 13 and Figure 14 Here, the slits 4e ...

Embodiment approach 3

[0140] In Embodiments 1 and 2 described above, the scanning actuator uses a leaf spring, but in Embodiment 3, it is a scanning actuator using a torsion bar.

[0141] Figure 15 It is a diagram showing a partial configuration of a scanning actuator including an angle detection device according to Embodiment 3 of the present invention. In this scanning actuator, a torsion bar 52 is used instead of the leaf spring 2 in Embodiment 1, and the restoring capability of the torsion bar 52 is effectively utilized, so that the movable part 53 corresponding to the movable part 3 swings around the axis of the torsion bar 52 . The movable portion 53 may be oscillated by a moving coil not shown in the figure, or may be oscillated by rotating the torsion bar 52 itself.

[0142] A torsion bar 52 penetrates through the center of the movable part 53, and both ends of the torsion bar 52 are fixed by the fixing parts 51a and 51b. In the lower part of both ends in the longitudinal direction of th...

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Abstract

The present invention is intended to enable even a scanning-type actuator using an elastic body such as a leaf spring to easily detect a scan angle with high accuracy. To do so, the scanning-type actuator includes an undeformable moving portion (3) provided on a tip end of a leaf spring (2) connected to a fixed portion (1), two-phase photo-sensors (SR, SL) provided on both ends of the moving portion (3), respectively, encoder slit plates (4R, 4L) provided in lower portions of the respective two-phase photo-sensors (SR, SL) and including slits (4), an origin sensor (SC), and a processing unit (13) that calculates an angle of the moving portion (3) based on detection values of the two-phase photo-sensors (SR, SL), count values (nA, nB) obtained by resetting the origin sensor (SC), and a distance (L) between the two-phase photo-sensors (SR, SL).

Description

technical field [0001] The present invention relates to an angle detection device for detecting the angle of a movable part that swings through an elastic body such as a leaf spring or torsion bar, and a scanning actuator using the same, and particularly relates to a laser radar scanning device suitable for road and traffic infrastructure An angle detection device and a scanning actuator using the same. Background technique [0002] In recent years, the driving load on drivers has increased due to the multifunctionalization of vehicles and the increase in traffic volume. In response to this, an ACC (Adaptive Cruise Control) system has been developed to reduce the driver's load and improve convenience. In order to construct this ACC system, it is often necessary to mount a radar device on the vehicle to detect obstacles, vehicles in front, and the like, pedestrians, and the like. As such vehicle-mounted radar devices, scanning devices using millimeter waves or light are oft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/22G01D5/245G01S7/48G02B26/10G01B7/30G01B11/26
CPCG01S7/48G01B21/22G01B7/30G01B11/26
Inventor 重松良平
Owner NHK SPRING CO LTD
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