Magnetic coder

Abstract

To provide a magnetic encoder, the main body 10 thereof comprising a shaft 11 with a recess portion 11a formed at the tip end, a magnet 12 laid in the recess portion 11a of shaft 11, a housing 13 rotatably supporting the tip end of shaft 11 by means of a recess portion 13a, a base plate 15 disposed over the magnet 12 and provided at lower side thereof with an IC chip 14 opposite to the magnet 12, a male connector 16 fitted on the upper side of the base plate 15, a female connector 17 being in connection with the strand 20a of lead cable 20 and detachably connected to the male connector 16, and a cover 18 for setting with the housing 13. Seal material 40 is applied over the cover 18 of main body 10 and the housing 13, except for the surface where the shaft projects out. Thus, the size of the product can be further miniaturized, the effect of water proof is ensured even without an O ring, and decrease of cost is possible.

Description

technical field [0001] The invention relates to a small magnetic encoder, which is used for the detection of the rotation angle of each joint of multi-joint automatic equipment, the position detection of the automobile steering wheel and the control of the brushless DC motor. Background technique [0002] There are optical and magnetic encoders, especially the optical encoder is equipped with a housing that supports a shaft with a rotating slit at the end to rotate freely, and a groove is formed on the outer peripheral surface of the housing. , embedded with an O-ring. The housing is fitted into the cover from the side of the rotation slit so that airtightness can be maintained (no publication describing this prior art can be found). [0003] However, grooves must be processed on the casing of the above-mentioned conventional encoder, and it takes time to process the grooves, and the embedding of the O-ring also takes man-hours, so the cost increases accordingly. In additi...

AI Technical Summary

Problems solved by technology

[0003] However, grooves must be processed on the casing of the above-mentioned conventional encoder, and it takes time to process the grooves, and it takes man-hours to insert the O-ring, so the cost increases accordingly.

In addition, since the outer peripheral surface of the housing is covered with a cover, it is not possible to confirm whether the O-ring is fitted into the groove.

As mentioned above, because the housing has grooves, the height of the housing becomes longer accordingly, and the size of the cover also becomes longer, resulting in a longer height of the encoder.

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