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Optical Encoder Unit and Optical Encoder

An encoder and optical technology, applied in the field of optical encoders, to reduce the influence of changes in the detected light quantity and relax the requirements

Inactive Publication Date: 2018-05-15
NSK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are optical and magnetic encoders, but optical encoders are easily affected by foreign matter, etc., and are easily affected by fluctuations in the amount of detected light.

Method used

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  • Optical Encoder Unit and Optical Encoder
  • Optical Encoder Unit and Optical Encoder
  • Optical Encoder Unit and Optical Encoder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0087] figure 1 It is a configuration diagram of the optical encoder unit according to Embodiment 1. figure 2 It is an external perspective view of the optical encoder unit according to the first embodiment. figure 1 yes figure 2 cross-sectional schematic diagram. image 3 It is an explanatory diagram illustrating an example of the arrangement of an optical code wheel and an optical sensor unit. Figure 4 It is a block diagram of the optical encoder according to Embodiment 1. Figure 5 It is an explanatory diagram showing an example of the pattern of the optical code wheel according to the first embodiment. The optical encoder unit 31 has a rotor 10 having a shaft 12 connected to a rotating machine such as a motor, a stator 20 , and an optical sensor unit 35 capable of reading a signal pattern.

[0088] Such as figure 1 As shown, the rotor 10 has as Figure 5 The optical code wheel 11 is shown as a disk-shaped or polygon-shaped component. The optical code wheel 11 is...

Embodiment approach 2

[0133] Figure 22 It is a configuration diagram of an optical encoder unit according to Embodiment 2. Figure 23It is an explanatory diagram illustrating an example of the arrangement of an optical code wheel and an optical sensor unit according to the second embodiment. In addition, the same code|symbol is attached|subjected to the same member as above, and the overlapping description is abbreviate|omitted. In the optical encoder unit 31, the light source light 71 of the light source 41 is reflected by the optical code wheel 11, and the reflected reflected light is used as the incident light 72. PD2 and the optical sensor unit 35A of the fourth light receiving part PD4 detect. The distance D between the emission surface of the light source 41 and the arrangement center S0 (optical sensor unit 35 ) is half that of Embodiment 1 due to specular reflection. Additionally, if Figure 22 As shown, the optical encoder unit 31 according to Embodiment 2 has the annular light shield...

Embodiment approach 3

[0135] Figure 24 It is a configuration diagram of an optical encoder unit according to Embodiment 3. In addition, the same code|symbol is attached|subjected to the same member as above, and the overlapping description is abbreviate|omitted. The optical encoder unit 31 according to the third embodiment has the same arrangement of the transmissive optical code wheel and the optical sensor as the first embodiment, but is different from the first embodiment in that the substrate 23 is a flexible substrate 23FP. The preamplifier AMP is an amplifier in which the optical sensor unit 35 is directly laminated on the package. Since the preamplifier AMP is built in the casing 21, durability can be improved. The preamplifier AMP may also be equipped with a light receiving element and an amplifier circuit on a bare chip. In addition, the preamplifier AMP may be integrally formed with a light receiving element and an amplifier circuit in semiconductor processing.

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PUM

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Abstract

An optical encoder unit (31) includes: a light source (41) having a predetermined light distribution; an optical scale (11) having a polarizer whose polarization direction on a plane is along a predetermined direction, and whose polarization direction is changed according to rotation; and an optical sensor unit (35) including a first photoreceiver (PD1), a second photoreceiver (PD2), a third photoreceiver (PD3), and a fourth photoreceiver (PD4) for receiving incident light that is light source light from the light source made incident on the respective photoreceivers by passing through or being reflected by the optical scale. An emitting surface of the light source and the optical sensor unit (35) are arranged at positions so as to receive a light intensity that is predetermined times greater or more than that corresponding to dark current of the optical sensor.

Description

technical field [0001] The present invention relates to an optical encoder unit and an optical encoder for detecting absolute angles using an optical scale. Background technique [0002] Encoders are used in various mechanical devices to detect the position and angle of moving elements. In general, encoders include encoders that detect relative positions or angles, and encoders that detect absolute positions or angles. There are optical type and magnetic type encoders, but optical type encoders are easily affected by foreign matter, etc., and are easily affected by fluctuations in the amount of detection light. [0003] Patent Document 1 describes a technique capable of reducing the influence of fluctuations in detected light quantities and improving resolution. [0004] Patent Document 1: International Publication No. 2013 / 065737 Contents of the invention [0005] In the technique of Patent Document 1, although the influence of fluctuations in the detected light quanti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D5/347
CPCG01D5/344G01D5/345G01D5/34715G01D5/3473G01D5/34707
Inventor 小口寿明
Owner NSK LTD