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Photoelectric rotary coder

一种旋转编码器、光电式的技术，应用在转换传感器输出、仪器、采用光学装置传递传感构件等方向，能够解决部件个数增加、制约装置小型化、不能扩大投光部分光束等问题，达到提高平行度的效果

Inactive Publication Date: 2004-03-10
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the foldback type rotary encoder shown in the prior art, the light projecting part and the light receiving part are arranged close to one side, so the light beam of the light projecting part cannot be expanded so that there is no direct leakage from the light projecting part to the light receiving part. Diffuse light, therefore, there is a limit in reducing the distance between the light projecting part and the turning part, restricting the miniaturization of the device
A light-shielding plate (corresponding to the stator in the prior art) is required to remove the diffused light leaking from the light projecting part without going through the turning part, which has the disadvantage of increasing the number of parts
Furthermore, the grades of the light projecting part and the light receiving part are different, so there is a disadvantage that the alignment accuracy between the light projecting part, the light receiving part and the return part is strict

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0048] figure 1 A structural diagram of a main part of a photoelectric rotary encoder according to Embodiment 1 of the present invention is schematically shown. In the figure, 1 is a light projecting and receiving module, on which a light projecting element 11 and a light receiving element 12 are installed on a substrate 13, and an optical element 14 is assembled on the substrate 13 and covers the light projecting element 11 and the light receiving element 12. On the surface of the optical element 14 is provided a first lens 21 utilizing a refractive difference with the surroundings, and inside is provided a cylindrical cavity 25 having an outer diameter smaller than that of the first lens 21 and having an opening surface 26 and a side surface 27 .

[0049] figure 1 Among them, 5 is a turning part, which has a reflective surface 22, which reflects the light beam 101 of the outgoing light from the light projecting element 11 converged by the first lens 21; the reflective surfa...

Embodiment approach 2

[0056] image 3 A configuration diagram schematically showing a light emitting and receiving module of a photoelectric rotary encoder according to Embodiment 2 of the present invention. and figure 2 Compared with the first embodiment, only the light projecting element 11 is covered by the optical element 17 , and the light receiving element 12 is closed by the silicon part 28 . For the composition of the turning part 5, the circular plate 6, etc., and figure 1 Same, therefore, not shown. According to this configuration, the shape of the optical element can be made smaller, and therefore, there is an advantage that the light emitting and receiving module 1 can be further downsized.

[0057] Thus, according to Embodiment 2, since the light projecting element is covered with an optical element and the light receiving element is sealed with silicon, a further downsized photoelectric rotary encoder can be obtained.

Embodiment approach 3

[0059] Figure 4 A configuration diagram schematically showing a light emitting and receiving module of a photoelectric rotary encoder according to Embodiment 3 of the present invention. exist figure 1 In the first embodiment, the fixed slit 51 formed by the V-groove is provided in the part of the optical element 14 facing the light receiving element 12, so that the incident angle of the incident light from the side of the folded part is 45 degrees, and the incident light is selective. ground shade. For the structure of the reentrant part 5, the circular plate 6, etc., and figure 1 Same, therefore, not shown.

[0060] For example, when the optical element 14 is made of polycarbonate with a refractive index of 1.58, the critical angle is 39.3 degrees, so the parallel light incident on the V-groove portion of the fixed slit 51 is totally reflected and blocked. According to this configuration, the light-shielding slit can be easily formed by processing only the V-groove in th...

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Abstract

A photoelectric rotary encoder includes a light source that emits a beam, a returning section that returns the emitted beam to a direction opposite to a emitting direction of the beam, and a photodetector that is disposed on a substrate on which the light source is disposed and that receives the returned beam via a disk having a detection pattern section. The photoelectric rotary encoder detects a rotation displacement of the disk based on the received signal. In this photoelectric rotary encoder, an optical element that lets a stray beam component of the beam from the light source escape to the outside via the side surface of the optical element, is disposed in front of the substrate on which the light source and the photodetector are disposed. The optical element covers the substrate to integrate the optical element and the substrate together.

Description

technical field [0001] The present invention relates to a photoelectric rotary encoder for detecting the rotation angle and rotation speed of a rotating body, and more particularly to a photoelectric rotary encoder for miniaturization of the device and improvement of assembly accuracy. Background technique [0002] A photoelectric encoder is a sensor used to detect the rotation angle, number of rotations, and rotation speed of a rotating body as digital quantities. In particular, as a sensor that detects the position and speed of a motor and transmits the information to a control unit, it is expected to be widely used in various industrial machinery fields such as robots and machine tools. [0003] The characteristic of the conventional foldback type rotary encoder is that a light projecting part and a light receiving part are arranged on one side by sandwiching a circular plate, and a foldback part for returning light emitted from the light projecting part to the light rece...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/34
CPCG01D5/342
Inventor 大村陽一岡徹中島利郎仲嶋一佐久間浩和岡室貴士阪本雅彥杉本耕一
Owner MITSUBISHI ELECTRIC CORP
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