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Rotation angle detecting device

A technology of rotation angle detection and rotating body, which is applied in the direction of measuring device, optical device, cover with auxiliary device, etc., can solve the problems of reducing the detection accuracy of the inner photo-interrupter, and achieve the prevention of the decline of detection accuracy and high precision Detection effect

Inactive Publication Date: 2005-10-12
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when a plurality of photointerrupters are arranged on the inside and outside corresponding to the inner and outer rails, the light from the LED of the photointerrupter arranged on the outer side is emitted to the inner photointerrupter side, so the light is received by the light receiving element as Interfering with light creates a new problem that reduces the detection accuracy of the inner photointerrupter

Method used

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  • Rotation angle detecting device
  • Rotation angle detecting device
  • Rotation angle detecting device

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Embodiment Construction

[0020] Below, with reference to accompanying drawing, embodiment of the invention is described, figure 1 It is a side view showing a partial fracture of the angle sensor involved in the embodiment of the present invention; FIG. 2 is a top view showing the internal mechanism of the angle sensor; image 3 It is a perspective view showing the arrangement of the photo-interrupters facing the protective plate included in the angle sensor; FIG. 4 is an explanatory diagram showing the positional relationship between the first and second photo-interrupters constituting each photo-interrupter group included in the angle sensor. ; Figure 5 is an explanatory diagram showing a position detection sensor included in the angle sensor; Image 6 It is an explanatory diagram showing a light-shielding plate, a light-emitting element, and a light-receiving element included in the position detection sensor; FIG. 7 is an explanatory diagram showing the relationship between the slits of the light-...

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Abstract

Provided is a rotation angle detecting device which can detect the rotation angle of a rotation body with high resolution and high precision. A code plate 3 which can be rotated in connection with a steering shaft and has a plurality of protrusion groups 3a, 3b arranged on an inner track and outer track T1, T2 and a plurality of the photo-interrupter groups 6A, 6B, 6C each having the combination of a pair of first photo-interrupters 6a arranged along the inner track T1 and a second photo-interrupter 6b arranged in the substantially center location of the photo-interrupters 6a are comprised. Among the photo-interrupters 6 in each the photo-interrupters 6A-6C, the light-emitting diode 61a of the first photo-interrupter 6a arranged at the inner track T1 is located at the outer circumferential side and the light-emitting diode 61b of the second photo-interrupter 6b arranged at the outer track T2 is located at the inner circumferential side.

Description

technical field [0001] The invention relates to a rotation angle detection device, which is suitable for use as an angle sensor and the like for detecting the steering angle of a steering wheel of an automobile. Background technique [0002] As an example of this type of rotation angle detecting device, there is known an angle sensor which has a rotating ring (ring) which can rotate intermittently with the rotation of the steering shaft (rotating body), and at a predetermined position of the rotating ring A shade extending in an arcuate shape is erected upright, and a plurality of photointerrupters are arranged facing each other so as to be positioned on the locus of the shade (for example, refer to Patent Document 1). Each photointerrupter has an LED (light-emitting element) and a phototransistor (light-receiving element). As the rotating ring rotates, the light-shielding plate passes between the LED and the phototransistor of each photointerrupter, thereby according to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/26G01D5/249G01D5/347G01D5/36
CPCG01D5/3473G01D5/2492G01D5/2497G01D5/34784B65D25/10B65D43/0212B65D51/24B65D85/24
Inventor 浦川雅丞
Owner ALPS ALPINE CO LTD