Slit photoelectric cell for incremental photoelectric encoder

Abstract

The slit photoelectric cell for an incremental photoelectric encoder belongs to the technical field of photoelectric technology. A photoelectric cell in the existing incremental photoelectric encoder is matched with a code wheel and a slit to be used, and while the gap of the code wheel and the slit is decided by light diffraction, so the gap is small. Thus, the need of the processing precision of the related size of related parts in the existing incremental photoelectric encoder is high, otherwise, the adjustment is difficult; the gap is small, so dish friction is easy to generate; and the gap is big, the signal quality is low. The slit photoelectric cell for an incremental photoelectric encoder is formed by a plurality of graduating cell bars. The graduating cell bars are distributed in parallel, and are electrically connected with a pitch P. The slit photoelectric cell for an incremental photoelectric encoder does not need slits.

Description

technical field [0001] The invention relates to a slit photocell for an incremental photoelectric encoder, which belongs to the field of photoelectric technology. Background technique [0002] Incremental photoelectric encoders are digital sensors for automatic control and angular displacement measurement. Slits and photocells are important components of incremental photoelectric encoders. Incremental photoelectric encoder is mainly composed of light source 1, objective lens 2, code disc 3, slit 4, photocell 5 and logic circuit 6, see figure 1 shown. The light source 1 adopts a luminous tube. Code wheel 3 is a circular grating. There are three sets of engraved lines on the slit 4, which are respectively called A set of engraved lines, B set of engraved lines, and Z set of engraved lines. on a yard track, see figure 2 shown. The pitch P between two adjacent engraved lines 7, the difference between the engraved lines of group A and the engraved lines of group B 1 / 4...

AI Technical Summary

Problems solved by technology

[0004] 1. The gap between the code disc 3 and the slit 4 is determined by the diffraction of light, so the gap is small. On the one hand, the processing accuracy of the relevant parts in the photoelectric encoder is high, and on the other hand, it is difficult to adjust. If the gap is small, it is easy to wipe the disk, and if the gap is too large, the signal quality will be low

[0005] 2. The gap between the code disc 3 and the slit 4 is greatly affected by the ambient temperature, resulting in unstable signals

[0006] 3. Since each set of scribe lines on the slit 4 corresponds to the photocell 5, the size of the photocell 5 cannot be made too small, which is not conducive to miniaturization; moreover, due to the large receiving area of ​​the photocell 5, the uneven illumination affects the signal quality

[0007] 4. The slit 4 and the photovoltaic cell 5 are installed and adjusted separately, which is not conducive to industrialization

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